- ZHANG Xuhui;HE Xin;XU Run;Sinopec Research Institute of Petroleum Processing Co.,LTD;
Torrefaction technology is a mild pyrolysis technology, which can effectively reduce the moisture content and O/C ratio of biomass, improve the capacity density and grindability, and extend the storage time. The most advanced treatment technology has a good auxiliary effect on pyrolysis, gasification, combustion and other processes. This paper mainly introduces the development and industrialization of biomass torrefaction technology at home and abroad, and discusses the technology categories, advantages and disadvantages of each and the application of industrialization in detail. Finally, the future development direction of torrefaction technology is prospected.
2024 S1 v.30 [Abstract][OnlineView][Download 1995K] - CHEN Jihao;ZHANG Jian;ZHANG Jinjing;Shaanxi Coalfield Geological Engineering Technology Co.,Ltd.;Shaanxi Coal Geological Group Co.,Ltd.;
In recent years, coal-based graphite as an anode material for lithium-ion battery has received extensive attention and research. Coal-based graphite anode materials have many advantages, such as rich reserves, low cost and excellent electrochemical properties. In this paper, the research progress of coal-based graphite in the field of lithium anode materials is reviewed, it mainly includes its structure characteristics, modification methods and the research results in improving the energy density, cycle stability and ratio performance of the battery. The properties of coal-based graphite have been greatly improved by surface modification, nano-treatment and composite material design. In addition, the key properties of coal-based graphite as anode material are analyzed, and the possible research directions and application prospects in the future are prospected.
2024 S1 v.30 [Abstract][OnlineView][Download 1791K] - PAN Xiaowen;ZHANG Miao;SONG Jie;LI Zhaobing;LAI Jinping;YU Jie;Guoneng Jiujiang Power Generation Co.,Ltd.;Guoneng Nanjing Electric Power Testing and Research Co.,Ltd.;State Key Lab of Coal Combustion,Huazhong University of Science and Technology;
Air pollution brings a great burden to the environment and the reduction of flue gas pollutants is one of the most important measures to control the air pollution. The desulfurization, denitration and mercury removal are the key points in the limitation of flue gas pollution. The paper reviewed the mechanism of dielectric barrier discharge for removing flue gases, and the effects of different reactor parameters, gas composition and gas interaction on the removal of NO_x,SO_2 and Hg~0were analyzed. The main application of different dielectric barrier discharge reactor was introduced and the reactor can be divided into volume dielectric barrier discharge, surface dielectric barrier discharge, coplanar dielectric barrier discharge, filling dielectric barrier discharge and two stage type dielectric barrier discharge. The removal of flue gases by Co catalyst barrier discharge and single dielectric barrier discharge was studied. Last, the best way to remove NO_x,SO_2 and Hg~0 was obtained. As the voltage and frequency of dielectric barrier discharge increase, the efficiency of pollutant removal shows an increasing trend, but further increasing the frequency decreases the removal efficiency. O_2 can promote the oxidation of NO and Hg within a certain range. Trace amounts of H_2O under high-energy electron action produce OH~- and HO~-_2,thereby promoting the oxidation of SO_2 and Hg. However, excess H_2O can inhibit the removal of pollutants. NH_3 can promote the oxidation of NO and SO_2. Dielectric barrier discharge activates catalyst surfaces to generate electrons and holes, promoting the oxidation of NO,SO_2,and Hg~0,thus exhibiting superior oxidative performance for pollutants.
2024 S1 v.30 [Abstract][OnlineView][Download 1979K] - YANG Zhongbiao;JIANG Shengyu;FENG Yiwu;ZHANG Panpan;ZHANG Qunli;YAO Jianhua;Tianjin Nangang Power Plant,Huadian International Power Co.,Ltd.;College of Mechanical Engineering,Zhejiang University of Technology;Institute of Laser Advanced Manufacturing,Zhejiang University of Technology;Huadian Electric Power Research Institute Co.,Ltd.;
CFB combustion technology is widely used in power, petroleum, chemical industry and waste treatment because of its wide range of fuel application and high combustion rate. However, CFB boilers always have serious high-temperature wear and corrosion problems, and the heated parts of boilers are often prone to failure, leading to unstable operation process and even boiler shutdown, which greatly reduces the service life of boilers. In order to improve the wear resistance and corrosion resistance of boiler surface, a variety of surface modification technologies have been applied to protect the heated surface of boiler in recent years. The process principle and characteristics of these surface protection technologies were described, including supersonic flame spraying, high-speed arc spraying, atmospheric plasma spraying, laser cladding and surfacing welding. Finally, the application prospect and future development trend of boiler surface protection technology were prospected, in order to provide some help for optimizing boiler surface protection technology.
2024 S1 v.30 [Abstract][OnlineView][Download 2251K] - JIA Jianhui;MA Ning;DONG Yang;LI Qiao;ZHANG Dong;National Institute of Clean-and-Low-Carbon Energy;
The coal gangue is associated accounting for 10%-15% in the process of coal mining and washing. The accumulation of large amounts of coal gangue not only occupies land resources, but also brings a series of environmental problems. It is imminent to utilize coal gangue comprehensively. Based on the chemical composition of coal gangue, the research on the comprehensive utilization of coal gangue is generally divided into two directions, including large-scale utilization and high-valued utilization. The direction of large-scale utilization of coal gangue was reviewed in detail in three aspects: energy utilization, building material production and filling reclamation. When the carbon content of coal gangue is higher than 20%(i.e.,the calorific value is 6 270-12 550 kJ/kg),the heat generated by its combustion can be used for power generation. When the carbon content of coal gangue is less than 4%,it can be used as coarse aggregate for the production of building materials. When the content of calcium and magnesium is less than 10%,and themass ratio of Al_2O_3 and SiO_2 is 0.30-0.50,it can be applied to the production of cement. When coal gangue is used for filling reclamation, it is necessary to consider the problem that heavy metal elements should not exceed the standard. The direction of high-valued utilization of coal gangue is reviewed in detail in the synthesis of zeolite and ceramic materials. Among them, the mass ratio of Al_2O_3 and SiO_2 is still one of the important parameters for condition optimization. And it can be modified by adding different materials to change the mass ratio of Al_2O_3 and SiO_2 to achieve the purpose of performance optimization. Among them, the high contents of SiO_2 and Al_2O_3 make coal gangue a potential precursor for synthetic zeolite, which is used to adsorb pollutants such as heavy metal ions and dyes in wastewater and greenhouse gases such as CO_2. By adding Al_2O_3 to form a higher mass ratio of Al_2O_3 and SiO_2,Si in coal gangue can be reduced, which may help to synthesize high-performance ceramic materials. However, there is still a certain distance from large-scale industrial application in the high-valued utilization of coal gangue at present. It is critical to improve material properties, shorten material production cycle and reduce production costs. In conclusion, the chemical composition of coal gangue in different regions must be considered in the study of comprehensive utilization of coal gangue. Based on the chemical composition of coal gangue, not only the comprehensive utilization rate can be improved, but also the economic and environmental benefits can be brought with collaborative large-scale utilization and high-valued utilization of coal gangue.
2024 S1 v.30 [Abstract][OnlineView][Download 1911K] - YIN Jincheng;PENG Beibei;GU Zhiqing;JU Peng;WU Weicheng;ZHANG Jing;Key Laboratory of Collaborative Innovation for Industrial Pollution Reduction and Carbon Reduction Shenyang City,Shenyang Institute of Engineering;School of New Energy,Nanjing University of Science and Technology;School of Petrochemical Engineering,Liaoning Petrochemical University;
At present, the use of traditional fossil energy such as coal still accounts for a large proportion in the country. In the context of increasingly strict environmental requirements, in order to achieve ultra-low emissions of industrial exhaust gas, complete the carbon peaking and carbon neutrality goals, and improve the efficiency of desulfurization and denitrification in industrial production, it has become an important issue that needs to be solved urgently. The wet/semi-dry desulfurization technology that has been used in industry for a long time is now difficult to meet current emission standards cost-effectively. In addition, there are also problems such as high maint-enance costs, complex technical processes, and difficulty in handling reaction products. Among the many desulfurization and denitrification solutions, dry calcium-based desulfurization agents have received widespread attention from scientific researchers due to their advantages such as easy recovery, small occupied volume, low price, and low heat loss. The advantages and disadvantages of dry calcium-based desulfurizers are systematically introduced. Given its existing problems, through a large number of literature surveys, the different modification methods of desulfurizers are classified and analyzed. The research progress and mechanisms of three common modification strategies: doping metal oxides, steam activation, and incorporating denitration additives were analyzed. Single doping or introduction of multiple metal oxides(such as Fe_2O_3,MgO,etc.) into the desulfurizer can significantly promote the desulfurization reaction of the desulfurizer; using steam activation during the preparation or reaction process of the desulfurizer can extend the service life of the desulfurizer and thereby improve the utilization rate of the desulfurizer; adding KMnO_4 and other denitrification-enhancing additives to the desulfurizer or introducing O_3 conditions during the desulfurization process can improve the denitrification performance of the desulfurizer. This shows that the desulfurization process can promote the denitrification reaction under certain conditions. At the same time, the feasibility of integrated desulfurization and denitrification was also confirmed. The above three methods optimize the reaction conditions and regulate the structure or components of the desulfurization agent to reduce the activation energy of the desulfurization reaction, increase the reaction active center, and increase the pore structure and specific sur-face area of the desulfurization agent, thereby improving the removal effect of the desulfurization agent. The modification strategies of dry calcium-based desulfurizers are recommended to be used in combination. By optimizing important parameters such as the specific surface area of the desulfurizer, a high-efficiency desulfurizer that can both desulfurize and denitrify can be synthesized.
2024 S1 v.30 [Abstract][OnlineView][Download 1868K] - CHEN Axiao;RAN Zhenzhen;MA Shuangchen;FAN Shuaijun;ZHANG Xiaoni;XU Shaojie;FENG Likui;CAO Qiuyang;Shenzhen Shenzhen-Shantou Special Cooperation Zone China Resources Power Co.,Ltd.;CR Power Energy Science and Technology Co.,Ltd.;North China Electric Power University(Baoding);State Grid Zhejiang Electric Power Co.,Ltd;
Under the goal of 'double carbon', the carbon capture technology of thermal power plants in China has made some progress. At present, carbon capture technology mainly includes pre-combustion carbon capture technology, oxygen-enriched combustion and post-combustion carbon capture technology. Firstly, the development status and research progress of three carbon capture technologies are introduced, and the advantages and disadvantages of the three technologies and the adaptation scenarios are comprehensively compared. Summarize carbon capture demonstration projects at home and abroad; the research of chemical absorption absorbent and the development status of energy saving and consumption reduction technology are mainly introduced. Finally, in view of the difficulties and challenges faced by the development of chemical absorption technology, three directions for the development of carbon capture technology in the future are proposed : the development of high-efficiency and low-energy absorbents, the development of energy-saving and consumption-reducing processes, and the development of decarburization system automation.
2024 S1 v.30 [Abstract][OnlineView][Download 1979K] - TIAN Buling;JU Huijiao;WANG Pu;Gansu Coal Geological Exploration Institute;
In order to find out the way of coal clean utilization in Pingshanhu Mining Area, through the study of the main coal seam coal 3-3 layer of Pingshanhu Mining Area, coal process performance analysis, microscopic identification and other means of the coal quality of the area was systematically analyzed, that the coal belongs to low to medium ash, high volatile matter, low sulfur, medium calorific value of long flame coal, is a better thermal coal and civil fuel. According to the cleanliness grade system of coal resources, the cleanliness grade of coal 3-3 raw coal in the area is grade III,which is a good clean coal, and the cleanliness grade of floating coal is grade II,which is a good clean coal, with a high cleanliness degree. Through the evaluation system of coal gasification, liquefaction, and low temperature pyrolysis, it is considered that the clean utilization direction of coal 3-3 layer in the area is generally suitable for coal for gas flow bed gasification and low temperature pyrolysis, but not for coal for fixed bed gasification and liquefaction.
2024 S1 v.30 [Abstract][OnlineView][Download 1799K] - CHANG Dingjun;TANG Suling;School of Geophysics and Information Technology,China University of Geosciences(Beijing);School of Energy,China University of Geosciences (Beijing);
CCUS(Carbon Capture, Utilization and Storage) is one of the key technologies to achieve carbon neutrality goals. Under the global visions of carbon peaking and neutrality, the application and development of CCUS technology are of great significance on sustainable development. The article introduced the development process from CCS(Carbon Capture and Storage) technology to CCUS technology, traditional CCUS technology methods, and the continuous enrichment and expansion of new CCUS technologies in new application scenarios. It focused on analyzing the current development status and trends of CCUS technology in China. It points out that the technical difficulties faced by CCUS mainly lie in the significant generational differences in CO_2 capture technology development, the lack of practical experience in CO_2 subsea pipeline transportation technology, and the technology for enhancing natural gas recovery and displacing hydrates. There are also many difficulties and challenges in the construction of large-scale industrial clusters. It is suggested to strengthen efforts in aspects such as technical system construction, key technology research and development, improvement of regulatory systems, incentive mechanisms, and international cooperation. Finally, it proposes a "three-step" path for the large-scale development and promotion of CCUS in China, namely, promoting the large-scale deployment of CCUS nationwide in an orderly manner in three stages: the industry pilot period(2021—2030),the regional promotion period(2031—2040),and the national application period(after 2040).
2024 S1 v.30 [Abstract][OnlineView][Download 1933K] - DENG Tianlu;YUAN Jin;YAG Meiyan;FENG Lin;SHI Wan;LI Xiaokai;Taiyuan University of Technology;Shanxi Kecheng Energy and Environment Innovation Research Institute;
According to the survey results of coal consumption in the whole society during the "13th Five-Year Plan" period of typical cities in Shanxi Province, this paper sorts out and analyzes the current characteristics of industrial coal consumption under the regulations in Shanxi Province, summarizes the key industries, causes and links of coal consumption under the existing regulations, and predicts and analyzes the industrial coal consumption under the regulations in Shanxi Province by 2030 based on the ARIMA model, and puts forward suggestions for reducing the coal consumption of industrial enterprises under the regulations to help the realization of the dual carbon goal process. The results show that during the "13th Five-Year Plan" period, the coal consumption of industrial enterprises in Shanxi Province showed a significant downward trend, and the proportion of coal consumption of industrial enterprises under the regulations to the total coal consumption of the secondary industry is now less than 10%. The implementation of industrial coal-fired treatment policies under the regulations has achieved remarkable results, and the number of coal-consuming industries has been reduced, dominated by the power and heat industry. The ARIMA(0,1,0) model predicts well, with an average relative error of only 2.27% from 2012 to 2019.The prediction results show that industrial coal consumption will decline at a flat rate under the regulations in Shanxi Province from 2021 to 2030,and will drop to 720 000 tons by 2030.
2024 S1 v.30 [Abstract][OnlineView][Download 6892K] - LIU Yun;Datang Fuping Thermal Power Co.,Ltd.;
"Three Reforms and Linkage" is an important technical route to promote the clean and low-carbon development of coal-fired power. The carbon reduction reform mainly focuses on 300/600 MW subcritical and supercritical old units with high coal consumption, and adopting the comprehensive reform scheme with upgraded parameters can effectively reduce the coal consumption of the power supply and at the same time improve the flexibility of the units. The next direction for "carbon reduction" is biomass blending in boilers. Coal power units are the main flexibility resources suitable for China's national conditions at present and in the future. The flexibility reform of coal power needs to solve problems such as boiler low-load stable combustion, hydrodynamic safety and local overheating of the heating surface, low SCR inlet flue gas temperature, etc.,the thermal stress of the high-temperature pressurized components of the turbine, and normal operation of the automatic control of the thermal control system under deep load regulation. It is believed that collaborating with coal-fired power units for peak shaving through large-scale thermal energy storage devices is an important development direction in the future. From the aspects of steam supply capacity, economy, and reliability, an in-depth study was conducted on the industrial steam supply scheme of coal-fired power units with main steam, cold reheated steam, and hot reheated steam as the main steam sources. It is considered that the hot reheated extraction scheme based on medium-pressure combined valve participation is the optimal technical scheme for industrial steam supply reform under wide load conditions. In order to further improve the heating capacity of CHP units, the low-pressure cylinder micro-output scheme has the advantages of low investment, good energy-saving effect, and flexible operation, making it a priority choice. The implementation of the "Three Reforms Linkage" requires the promotion and support of the energy system revolution. It is necessary to improve the power market system to adapt to the new power system, fully reflect the market-based operation mechanism, and improve the enthusiasm and initiative of enterprises in their transformation.
2024 S1 v.30 [Abstract][OnlineView][Download 1901K] - CAI Lihong;GU Yongzheng;YU Changjun;LI Xiaoliang;WU Xueyi;SONG Peng;Department of Chemical Engineering,Tsinghua University;Yuanchu Tech.Beijing Co.Ltd;Guodian Datong Power Generation Co.,Ltd.;
China′s energy endowment of more coal and less oil determines that coal is the most used fossil energy. A large amount of coal used for fuel is bound to produce a huge amount of carbon dioxide emissions, which undoubtedly aggravates the difficulty of achieving the goal of carbon peak and carbon neutrality in China. Since 2010, China′s power industry has been continuously optimized and adjusted, the proportion of thermal power generation and the proportion of thermal power installed capacity have continued to decline, and the proportion of non-fossil energy power generation has increased year by year. Although the proportion of thermal power is decreasing year by year, its dominant position in China′s power energy structure can not be changed. Based on the analysis of data From China Emission Accounts and Datasets(CEADs), China′s electric power industry will emit 4.624 billion tons of carbon in 2020, accounting for 42.21% of the total carbon emissions in that year. The development of the power industry is related to the national economy and people′s livelihood, and is the pillar of the national economy. In a long historical period, coal occupies a dominant position in China′s energy structure. In the context of steady rise in energy demand, coal power has become the "ballast stone" of stable supply of energy power in China, and it is difficult to be completely replaced by other energy sources in the short term. At present, the carbon emission reduction in coal power industry mainly adopts energy saving and energy efficiency improvement, fuel blending, carbon capture, utilization and storage(CCUS) technology and carbon dioxide mineralization technology. Considering the actual carbon emissions of power plants and the current maturity of CCUS technology, biomass energy combined with carbon capture and storage technology and indirect mineralization technology is a feasible solution to achieve carbon neutrality in power plants at present. However, the biomass energy combined with carbon capture and storage technology requires the original boiler to be mixed-fired transformation, and there are still many shortcomings in China′s biomass power generation technology, especially in the collection, transportation, processing, storage and other special auxiliary machinery development supporting aspects. For the development of carbon neutral technology in the coal power industry, according to the actual situation in China, it is recommended to adopt the medium and long term carbon capture and utilization technology route, and carry out technological innovation of pre-combustion capture technology, oxygen-rich combustion technology and post-combustion capture technology simultaneously, develop low-cost and high-efficiency technical system and commercialize it.
2024 S1 v.30 [Abstract][OnlineView][Download 1870K] - WANG Rui;MA Lili;LI Fan;YANG Lei;CHEN Ting;WANG Shaorong;SHI Caixia;CGN Wind Energy Co.,LTD;Puluodun Institute of Hydrogen Energy Storage;School of Chemical Engineering & Technology,China University of Mining and Technology;
Solid Oxide Electrolysis Cell(SOEC), as an efficient energy conversion device, can convert surplus electricity into hydrogen energy and has broad application prospects. However, in the actual operation of SOEC, due to the much larger volume of H_2O molecules, the mass transfer efficiency of H_2O molecules in the traditional cathode structure decreases, thereby reducing the electrolysis performance. Therefore, improving the mass transfer efficiency of water vapor is of great significance for its performance improvement. To improve the mass transfer efficiency of water vapor, the structure of cell has been specially designed; A large-area SOEC single cell was prepared using a gradient pore structure cathode, combined with a new air electrode material, and Sc stabilized zirconia(ScSZ) as the electrolyte. A single pore structure cathode single cell was used as the control group, and the electrolytic performance of the two structures of cathode single cells was tested and characterized. The results showed that the electrolysis performance of a single pore cathode single cell was lower than that of a gradient pore cathode single cell under the same content of water vapor at 750 ℃. The electrolysis power of a large area single cell with a diameter of 10cm x 10cm at 750 ℃ @ 1.3 V-80% H_2O was 32 W for the former and 40.2 W for the latter, indicating that the design of the stepped pore structure cathode improved the electrolysis performance.
2024 S1 v.30 [Abstract][OnlineView][Download 1899K] - LIU Lang;WU Bencheng;ZHU Jianhua;LIU Changjin;CUI Tingzheng;YANG Xiuling;College of Chemical Engineering and Environment,China University of Petroleum-Beijing;Xinjiang Guanghui New Energy Co.,Ltd.;
In order to analyze the source and formation mechanism of organic chlorides in coal-to-methanol syngas, a set of independent reactions of the formation reaction system was determined by atomic coefficient matrix method. After calculating the standard heat of generation, standard entropy and constant pressure specific heat capacity of each component according to the Benson group contribution method and manual query, the Gibbs free energy change of each independent reaction in the reacting system under different condition was calculated by thermodynamic methods, and the possibility of each independent reaction under the specified conditions was judged. It can be seen from the calculation results that chloroethane, chloropropane and chlorobutane can occur spontaneously when the normal pressure and temperature are lower than 550 K,and increasing the pressure helps to increase the possibility of spontaneous formation of such organochlorides. The analysis results can insight to the generation of organic chlorides in coal to methanol syngas and the subsequent development of the technology for the removal of organochloride.
2024 S1 v.30 [Abstract][OnlineView][Download 1895K] - QI Yuexin;TIAN Lu;XU Xiuli;XU Hengguang;DOU Jinxiao;YU Jianglong;Key Laboratory for Advanced Coal and Coking Technology of Liaoning Province,University of Science and Technology Liaoning;Sinosteel Anshan Research Institute of Thermo-Energy Co.,Ltd.;
The evolution mechanism of carbon structure and cross-linking structure during coal coking was investigated. Five coal samples, Guanyintang coking coal, Matou coking coal, Wugou fat coal, Xiaoxian fat coal and Yanzhou West gas coal, were selected for coking experiments. The coking products were sampled according to 600,700,800,900 and 1 000 ℃,and the changes of carbon structure and cross-linking structure of the coking products in different temperature intervals were analyzed by combining XRD and Raman characterization methods. It is found that the average lateral size(L_a) and aromaticity(f_a) both increased gradually with increasing temperature, the stacking height(L_c) and the number of layers(N_(ave)) decrease gradually with increasing temperature, and the interlayer spacing(d_(002))decreases gradually overall, but the change in value is small. This suggests that the evolution of the coking coal microcrystalline structure is characterized by an increase in lateral size and a decrease in longitudinal stacking height accompanied by an increase in aromaticity. It is found that the Raman band area ratios A_D/A_G,A_D/A_(all),A_S/A_G show an overall increasing trend with increasing temperature. Moreover, A_D/A_G and A_S/A_G increase more gently at temperatures from 900 ℃ to 1 000 ℃,and A_(GR+VL+VR)/A_D show an overall decreasing trend with increasing temperature. The results of correlation analysis show that L_a show positive correlation with A_D/A_(all) and A_S/A_G,and L_a show negative correlation with A_(GR+VL+VR)/A_D. This suggests that changes in the size of the microcrystalline structure are closely related to the formation of the cross-linking structure.
2024 S1 v.30 [Abstract][OnlineView][Download 2021K] - WEI Jiaming;LI Xiaoguang;WANG Yingyan;FENG Pingan;LI Shiyuan;School of Energy and Environmental Engineering,University of Science and Technology-Beijing;Shaanxi Coal Power Group Co.,Ltd.;
A visualization experiment platform for the pneumatic transport of high-temperature coke from coal pyrolysis was established. The corresponding relational equation between powdered coke volume fraction and grayscale value of the image taken by high speed camera was established. The pneumatic conveying characteristics were studied using air and CO_2 as conveying gases under different superficial gas velocities, coke powder masses, and coke powder temperatures. The experimental research shows that CO_2 has a stronger transport capacity than air for transporting coke at the same temperature. The superficial gas velocity of CO_2 is 8.9 m/s for conveying 500 ℃ coke, which is equivalent to the conveying capacity of air with an superficial gas velocity of 14.2 m/s. When CO_2 is used as the carrier gas to transport high-temperature coke, the transport capacity increases as the coke temperature rises. When the coke temperature is at 27-120 ℃,a superficial gas velocity higher than 10.6 m/s is necessary to ensure a stable flow pattern, while a stable flow pattern can be formed when the superficial gas velocity reaches 8.9 m/s when the coke temperature is above 300 ℃.
2024 S1 v.30 [Abstract][OnlineView][Download 2124K] - YU Nan;ZOU Chong;LI Yanxiong;LI Xin;ZHANG Zhe;ZHAO Qianlong;School of Metallurgical Engineering,Xi′an University of Architecture and Technology;Inner Mongolia Zhengneng Chemical Industry Group Co.,Ltd.;
To investigate the crushing characteristics and distribution patterns of inorganic minerals in low-rank coal from the Shenfu coalfield during carbonization in a vertical retort furnace, this study analyzed the basic coal quality characteristics and main inorganic minerals. Examined the particle size distribution, proximate analysis, and inorganic mineral composition of semi-coke produced by 13 companies using internally heated vertical retorting furnaces with the same process and scale. Pyrolytic semi-coke was prepared at different temperatures using a well-type furnace, semi-coke was then crushed using a mechanical strength determination equipment, and the particle size distribution of the broken charcoal and the ash yield of semi-coke with different particle sizes were analyzed. The results indicate significant differences in the basic composition, inorganic mineral content, and thermal stability of coal from different mining areas in the Shenfu coalfield. SiO_2,CaO,Al_2O_3,and Fe_2O_3 are the main components of raw coal ash, with SiO_2 content being the highest. As the ash yield in coal increases, the SiO_2 content in coal ash gradually increases while CaO content decreases. Medium-sized semi-coke and small-sized semi-coke collectively make up over 62% of semi-coke output from vertical retort furnace. The level of particle fragmentation in lump coal during carbonization is primarily influenced by the inherent properties of the raw coal and the mechanical processes within the furnace. The thermal stability of the raw coal can serve as an indicator for estimating the extent of particle fragmentation in the carbonization furnace. The prediction formula for the mass proportion of fine semi-coke during industrial production was determined, based on the thermal stability of raw coal. As the particle size of semi-coke decreases, the ash content initially decreases and then increases. The levels of SiO_2 and Al_2O_3 in the ash first increase and then decrease, while the CaO content follows a pattern of decreasing and then increasing. In medium-sized semi-coke, the SiO_2 and Al_2O_3 content is highest, with CaO content being the lowest. The ash yield of semi-coke is influenced by both the initial ash content of the raw coal and the extent of reaction that occurs during the production process in the retort furnace. The degree of semi-coke fragmentation exhibits a trend as the pyrolysis temperature rises, initially increasing, then decreasing, and subsequently increasing again. This behavior is attributed to the effects of volatilization and alterations in organic groups within the coal.
2024 S1 v.30 [Abstract][OnlineView][Download 2007K] - XU Hao;ZhejiangZheneng Technology & Environmental Group Co.,Ltd.;
It is desulfurization process upgraded in response to the problems of low desulfurization efficiency, high outlet smoke and ammonia escape in the ammonia flue gas desulfurization device of a large coal chemical enterprise. Performance testing and continuous operation monitoring were conducted on the inlet and outlet SO_2 concentration, particulate matter concentration, ammonia concentration, and NO_x concentration of the renovated ammonia desulfurization system. The main pollutant emissions from the outlet of the ammonia desulfurization system can stably reach ultra-low emission levels. The operating pH of the solution in the main equipment of the ammonia desulfurization system was continuously monitor,the proportion of NH_4HSO_3 and(NH_4)_2SO_3 were analyzed. It is suggested that increasing the oxidation and regeneration rates of NH_4HSO_3 can improve desulfurization efficiency and crystal product purity
2024 S1 v.30 [Abstract][OnlineView][Download 2019K] - AI Zejian;ZHU Xiaolei;LENG Lijian;YANG Jianping;LI Hailong;School of Energy Science andEngineering,Central South University;
This research investigated the catalytic pyrolysis characteristics of oily sludge(OS) using athermogravimetric analyzer. Based on the Artificial Neural Network(ANN) algorithm, a machine learning model predicting catalytic efficiency was established to guide the optimization of the catalytic pyrolysis process. The study indicates that Fe_2O_3 and CaO can decrease the peak thermogravimetric temperature of OS. The peak thermogravimetric temperature decreases from 315 ℃ to 270 ℃ at the first pyrolytic stage, and decreases from 460 ℃ to 420 and 430 ℃,respectively, at the second pyrolytic stage. The reaction kinetic models suggest that Fe_2O_3 and CaO can reduce the pyrolysis activation energy of organic components in OS from 33 kJ/mol to 25 kJ/mol and 30 kJ/mol, respectively, with Fe_2O_3 exhibiting a higher catalytic efficiency. The established machine learning model accurately predicts the catalytic pyrolysis process(R~2=0.99,R_(MSE)=0.03). According to the prediction of machine learning model, when choosing Fe_2O_3 as the pyrolysis catalyst with a mixing ratio of 13% at a pyrolysis temperature of 440 ℃,the catalytic efficiency of OS can reach its peak at 10.27%. This study provides a new perspective for the catalytic pyrolysis of organic solid waste like OS.
2024 S1 v.30 [Abstract][OnlineView][Download 1958K] - ZHANG Yi;LI Xuejun;WANG Jueheng;YU Hu;CHENG Yuanlin;ZHANG Shu;China Energy Construction Group Hunan Electric Power Design In-stitute Co.,Ltd.;
The energy field is the main battlefield for provinces and even the whole country to achieve carbon peak as scheduled. Carrying out the research on driving factors of carbon emissions in the energy field has positive significance for all the provinces to scientifically formulate carbon-reduction policies and plan carbon reduction paths.This paper adopted a combination of qualitative and quantitative methods. Taking a province in central China as an example, according to the two levels of energy consumption varieties and terminal consumption departments, different terminal consumption varieties were segmented decomposition, the carbon emissions in the energy field of the province from 2005 to 2020 were decomposed into three periods, seven terminal consumption sectors and 14 driving factors. From the decomposition results, the driving factors of carbon emissions with positive effects include GDP,per capita disposable income, the number of vehicles and total power generation, while the driving factors with negative effects are mainly the energy consumption intensity of each terminal department. The largest negative driving factors of carbon emissions in 2005—2010 and 2010—2015 is the terminal energy consumption intensity, which accountes for-65.9% and-51.1%,respectively.The largest negative driving factor of 2015—2020 is the economic structure, accounting for-14%,the positive contribution of GDP to the growth of carbon emissions in the three periods are the largest, which are 78.2%,49.9% and 23.1% respectively. From the radar chart of contribution rate in the three key node years of 2010,2015 and 2020,the economy's contribution to carbon emissions is still positive, but gradually decreasing. The negative contribution rate of energy consumption intensity is gradually decreasing, indicating that the economic development of the province is not completely decoupled from carbon emissions, but the overall trend is towards decoupling. As can be seen from the result that the driving effect of energy consumption intensity on carbon emissions is reduced, controlling the total energy consumption and energy consumption intensity only through the policy of "dual control of energy consumption" has a great effect on energy conservation, but has little impact on the realization of the dual carbon goal. In order to ensure the scheduled realization of the dual carbon goal, the key is to change from "dual control of energy consumption" to "dual control of carbon emission". The next step will focus on exploring ways to reduce total carbon emissions and carbon intensity.
2024 S1 v.30 [Abstract][OnlineView][Download 2050K] - QUAN Cui;GUO Aijun;HU Yadi;XU Lianhang;NING Yong'an;TANG Houzhang;GAO Ningbo;School of Energy and Power Engineering,Xi′an Jiaotong University;National Energy Group Shendong Coal Group Co.,Ltd;
In order to study the thermochemical conversion characteristics of coal slime, pyrolysis and combustion experiments at different heating rates(10 ℃/min, 20 ℃/min, 30 ℃/min) were carried out using a thermogravimetric analyzer. Two kinetic methods of calculation, Flynn Wall Ozawa(FWO) and Kissinger Akahira Sunose(KAS),were used to calculate and compare the kinetic parameters of coal slime pyrolysis and combustion process. The results indicate that with the increase of heating rate, the thermal gravimetric(TG) and differential thermal gravimetric(DTG) curves of pyrolysis and combustion of coal slime shift towards high temperature direction. The DTG curve of the coal slime pyrolysis mainly presents two obvious weight loss peaks. During the combustion process, due to the overlap of volatile and fixed carbon combustion processes, a significant weight loss peak appears in the DTG curve within the range of 300—580 ℃,and the burnout time decreases with the increase of heating rate. The activation energies of the first stage of coal slurry pyrolysis calculated by the FWO method and KAS method were 175.78 kJ/mol and 163.40 kJ/mol, respectively, and the activation energies of the second stage of pyrolysis were 225.37 kJ/mol and 209.51 kJ/mol, respectively. The activation energies of coal slurry combustion process calculated by the FWO method and KAS method are 109.12 kJ/mol and 102.65 kJ/mol, respectively. The results obtained by these two methods have good consistency, and the comprehensive use of the two kinetic calculation methods is conducive to forming a more comprehensive understanding of the pyrolysis and combustion process of coal slurry.
2024 S1 v.30 [Abstract][OnlineView][Download 2049K] - HAI Xueqin;KONG Chuizhong;MEN Xiaoyong;BAI Yonghui;LV Peng;SONG Xudong;SU Weiguang;WANG Jiaofei;YU Guangsuo;State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia University School of Chemistry and Chemical Engineering;Methanol Branch of Ningxia Coal Industry Company of National Energy Group;Institute of Clean Coal Technology of East China University of Science and Technology;
Entrained flow gasification fine slag(FS) has a high carbon content, FS is expected to achieve the resource utilization when blended with the coal. In the article, three different coal ranks of coal and FS were selected as raw materials, and the co-combustion characteristics, interaction and kinetics of the two raw materials were investigated by a thermo-gravimetric analyzer. The results show that all three different coal ranks additions improved FS synthetic combustion performance, there is a weak improvement in FS ignition and burnout performance when anthracite coal is added at 80%,bituminous coal and lignite can lower the FS ignition point by 137 ℃ and 180 ℃ and the burnout temperature by 118 ℃ and 132 ℃,and the steady combustion index increased by 38%,78% and 81% respectively compared to FS combustion alone; The activation energy required for this reaction process reaches up to 148 kJ/mol due to the low volatile matter content of anthracite and little interaction between FS,with the increase of bituminous coal and lignite additions, the weight loss peak of the co-combustion system gradually changed from a double peak to a single peak, the release of large amounts of volatile matter from coal synchronizes the co-combustion process between coal and FS,lignite and FS interactions are more evident, bituminous coal and lignite co-combustion systems with FS require a maximum activation energy of only 71 kJ/mol and 57 kJ/mol; decoupled the contribution of volatile matter in coal to carbon conversion in FS in the co-combustion system at 900 ℃ by in-situ high temperature hot stage microscopy and image processing techniques, of which the anthracite system had the lowest FS particle area conversion rate of 65% while bituminous coal and lignite resulted in higher FS particle area conversion in the system, reaching 78% and 87%,respectively due to their higher volatile matter, resulted in higher FS particle area conversion in the system, reaching 78% and 87%,respectively. This study provides theoretical guidance for the development of co-combustion technology between coal and entrained flow bed gasification fine slag.
2024 S1 v.30 [Abstract][OnlineView][Download 2219K] - HU Guotao;YANG Xiaojian;WANG Yibin;FENG Jingwu;LIN Chi;ZHENG Chunli;TAN Houzhang;Wenfu Group Limited liability Company;MOE Key Laboratory of Thermo-Fluid Science and Engineering,Department of Thermal Engineering,Xi'an Jiao tong University;
As a renewable zero-carbon fuel,biomass can replace coal-based reductants and has certain potential in terms of reducing iron oxides.In this paper,the effects of different temperatures and Na_2CO_3addition on the evolution behavior of hematite in roasting sulfuric acid residues reduced by biomass,as well as the characteristics of gaseous and solid products were investigated.The experimental results showed that the reduction reaction path of hematite by biomass at different temperatures was hematite→magnetite+triiron carbide,and increasing the reduction temperature easily led to the formation of ferrosilicon aluminum alloy phase in the roasting products.The optimal reduction temperature was 700℃，and the corrected mass fraction of Fe_2O_3in the reduced product was increased by about 20%.The addition of Na_2CO_3can not only react with quartz to convert into sodium silicate,but also promote the formation of ferrous oxide and silicon carbide.After the reduction reaction,the average pore diameter of the biochar surface became smaller,while its specific surface area was larger.Compared to pyrolysis of pure biomass,the volume of combustible gases in the bio-gases was slightly changed for reduction reaction with sulfuric acid residues.
2024 S1 v.30 [Abstract][OnlineView][Download 2050K] - QIU Jie;CUI Zhigang;WANG Kang;WANG Sheng;DONG Yuehong;XU Jingxin;School of Electrical and Power Engineering,Taiyuan University of Technology;National Key Laboratory of Low-carbon Intelligent Coal-fired Power Generation and Ultra-Net Emissions,National Energy Group Science and Technology Research Institute Co.,LTD;
To explore the potential application of biomass in deep load regulation of circulating fluidized bed(CFB) units under low load conditions, experimental and numerical simulation methods were combined to analyze the impact of different biomass blending ratios on the internal temperature, pressure, gas concentrations, and particle dynamics within CFB boilers. The study found that with biomass blending ratios of 10% and 20%, the temperature rise rate in the dense phase zone of the circulating fluidized bed increased by 2-8 ℃/min, but the stable temperature decreased as the blending ratio increased. To understand the reasons behind this phenomenon, numerical calculations were performed for three different operational scenarios. It was discovered that as the blending ratio increased from 0% to 20%, the pressure drop in the dense phase zone decreased from 900 Pa to 700 Pa; CO concentration reduced from 10% to 5%; CO_2 concentration decreased from 17% to 12%; and particle concentration decreased by 18%. Conversely, the concentrations of various components in the dilute phase zone increased, particularly with particle concentration rising by 38%. This indicates that the addition of biomass causes the combustion zone to move upward in the furnace. These findings demonstrate that biomass co-firing can effectively improve the temperature rise characteristics inside the furnace under low load conditions and meet the demands under the "dual carbon" goals, providing a new method for grid peak regulation under low load conditions.
2024 S1 v.30 [Abstract][OnlineView][Download 1906K] - FANG Neng;LU Yu;ZHANG Bowen;LIANG Chen;LI Wei;REN Qiangqiang;State Key Laboratory of Coal Conversion,Institute of Engineering Thermophysics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Shanxi Key Laboratory of Coal Flexible Combustionand Thermal Conversion,Datong Institute of Coal Clean and Efficient Utilization;
Preheated combustion is an effective way for the resource disposal of gasification fly ash. It is usually combined with air-staged main chamber to achieve efficient and clean combustion. Therefore, the oxygen-lean combustion flame characteristics of high temperature preheated fuel is crucial. In this paper, a 250 kW combustion flame test platform was built. Through high-temperature flame visual monitoring and image programming treatment, the effect of the secondary air inclination angle of the main chamber on the oxygen-lean flame characteristics of gasification fly ash preheating combustion was studied. The experimental results show that as the secondary air inclination angle increases from 30° to 60°, the oxygen-lean combustion flame gradually moves away from the burner outlet. Meanwhile, the dimensionless value of the lift-off distance increases from 1.04 to 3.73, and the dimensionless value of the flame width gradually decreases from 4.09 to 3.47. When the secondary air inclination angle in the main chamber is 30° and 45°, the carbon conversion rate of the combustion system is 71.6% and 70.3%, respectively. Considering the impact of the secondary air inclination angle on the operation stability of the burner and burnout of the gasification fly ash, an optimal secondary air inclination angle of 45° is recommended.
2024 S1 v.30 [Abstract][OnlineView][Download 1980K] - SUN Liangjie;ZHU Runru;HUANG Yun;WAN Wei;LI Haojie;CHEN Gang;TANG Ziqiang;SHAO Zongping;College of Chemistry and Chemical Engineering,Nanjing University of Technology;Institute of Process Engineering,Chinese Academy of Sciences;Beikong Environmental Renewable Energy Zhangjiagang Co.,Ltd;
Using a 750 t/d mechanical grate furnace of a waste incineration plant as research object, the effect of domestic sludge co-incineration on the physical and chemical properties of fly ash was investigated by sampling and analyzing the fly ash at the bag filter under the working conditions of different sludge blending ratios. The results showed that: sludge blending modified the particle size distribution of the fly ash at the bag filter, which was bimodal and unimodal in the unblended and blended conditions, respectively, but the main peaks were both located within 10 microns; sludge blending increased the fine particles adhering to the surface of the fly ash with the peak particle size. A comparison of the elemental composition of calcium and chloride in the fly ash showed that the elemental composition of the fly ash was strongly affected by the deacidification process, which significantly increased its calcium content; co-incineration sludge increased the element iron and sulfur content of the fly ash, but had a relatively little effect on the sodium and potassium elements.
2024 S1 v.30 [Abstract][OnlineView][Download 1970K] - YAO Weiqiang;LIU Zilin;LIU Xiaogang;BU Xiaobo;MA Shaodan;JIN Wei;YANG Xinglong;WANG Jianxiong;LIU Wentao;LIN Dehai;WANG Hong;China Energy Dawukou Thermal Power Co.,Ltd.;National Institute of Clean-and-Low-Carbon Energy;Beijing Institute of Petrochemical Technology;
In the context of achieving carbon neutrality, coal-fired power plants are increasingly confronted with the challenge of CO pollution during low-load operations, posing newtechnical challenges for the synergistic removal of CO and NO_x. This study focused on the preparation of Fe/ZSM-5(x) catalysts(x=25,46,70,81) via a low-temperature impregnation method and investigated the effect of the Si/Al ratio on the CO selective catalytic reduction(CO-SCR) activity of these catalysts. Characterization techniques including X-ray diffraction(XRD),Brunauer-Emmett-Teller(BET) surface area analysis, H_2 temperature-programmed reduction(H_2-TPR),NO temperature-programmed desorption(NO-TPD),and NH_3 temperature-programmed desorption(NH_3-TPD) were utilized to evaluate the catalysts' properties. The results show that the Fe/ZSM-5(70) catalyst, with a higher Si/Al ratio, exhibited a larger surface area, superior redox capabilities, and better NO adsorption-desorption properties. This leads to a high conversion rate of NO at 76.6% at 600 ℃,indicating its enhanced CO-SCR de NO_x performance. These findings significantly contribute to understanding the impact of the Si/Al ratio on the activity of the Fe/ZSM-5 series catalysts and offer a scientific basis for improving the efficiency of pollutant removal under low-load conditions in coal-fired power plants.
2024 S1 v.30 [Abstract][OnlineView][Download 1875K] - RONG Jun;YUAN Donghui;ZHANG Weiwei;YANG Guang;WANG Yankai;HAN Yi;Inner Mongolia Electric Power Research Institute Branch,Inner Mongolia Electric Power (Group) Co.,Ltd.;College of Energy and Power Engineering,Inner Mongolia University of Technology;
It is necessary to reduce the power consumption of the fan in the secondary air system of pulverized coal boiler under low load and reduce the wear of the water-cooled wall near the nozzles caused by the fly ash entering the furnace with the secondary air. The flow characteristics of gas and fly ash in the secondary air system of 350 MW supercritical tangential combustion pulverized coal boiler were calculated and analyzed by numerical simulation, and the structure of the secondary air system was optimized. The results show that the secondary air distribution of each burner nozzle along the same corner height is related to the air distribution mode, and the air distribution at the four corners of the same layer is basically the same. After the fly ash enters the big bellow, it is easy to deposit at the bottom. The AA layer has the highest auxiliary wind speed and the highest fly ash concentration. After the optimization of the structure of the secondary air system, the rotation trend of the secondary air in the main air duct can be effectively eliminated, the airflow vortex at the bottom of the big bellow can be reduced, the concentration of fly ash entering the nozzle of each burner is more uniform, and the wear risk of the water-cooled wall near the nozzle can be reduced. Before and after structural optimization, the maximum pressure difference between the inlet and outlet of the secondary air system can be reduced by 89.5 Pa.
2024 S1 v.30 [Abstract][OnlineView][Download 1991K] - LU Kang;Polycarbonate Material Co.,Ltd.,China Pingmeishenma Group;
The ignition burner under the bed of a 260 t/h circulating fluidized bed boiler in a thermal power plant is difficult to stabilize the combustion. When the ignition damper is closed to 5% and the combustion damper is kept 100%,the ignition can be successful, but the vibration of the ignition duct is large. Gradually opening the ignition damper will cause the burner to extinguish the fire. The combustion state of the left and right burners is inconsistent. In order to analyze the cause, the computational fluid dynamics analysis software Fluent was used to numerically simulate the flow field of the air duct of the burners under the boiler bed. The results show that the air distribution on the left and right sides is uneven, and the turbulence in the ignition duct is large. Finally, the combustion stability of the burner can be achieved by adjusting the opening of the ignition damper and the combustion damper. The actual operation idea is consistent with the numerical simulation analysis results. It is suggested to allocate ventilation ducts reasonably during the design of ignition duct to avoid excessive turbulence. At the same time, it is recommended that users purchase burner equipment, fully communicate with the designer, understand its design ideas, so that each equipment matches.
2024 S1 v.30 [Abstract][OnlineView][Download 2002K] - QIU Hua;HUANG Xiaoming;CAI Xingfei;CHEN Lei;JIANG Long;SU Sheng;XIANG Jun;CHN Energy Changyuan Electric Power Co.,Ltd.;Huaneng Power International Inc.Jinggangshan Power Plant;Shenzhen Zhongyuan Environmental Technology Co.,Ltd.;Huazhong University of Science and Technology;
With the continuous tightening of NO_x emission standards, the technical demand for reducing NO_x emissions is growing in the field of power generation. The low NO_x swirl burner is considered as one of the most promising NO_x emission control technologies. In order to reduce NO_x emissions, this paper developed a swirl burner of 600 MW opposed coal-fired boiler. The reasearch analyzed the flow field, temperature, and gas component distribution of a single burner. Additionally, the furnace temperature field and NO distribution were further analyzed after coupling the burner with the furnace. The simulation results show that in the new low NO_x burner, when middle secondary air is concurrent, the coal combustion is more sufficinent, the air staging effect is enhanced, leading to the formation of a reducing atmosphere. The NO emission can be further reduced by approximately 21%. This research can provide theoretical basis and engineering reference for the retrofitting of low NO_x burners in pratical power plants.
2024 S1 v.30 [Abstract][OnlineView][Download 2234K] - GE Chen;LI Shiyuan;XIA Hongde;School of Energy and Environmental Engineering,University of science and technology Beijing;Institute of EngineeringThermophysics,Chinese Academy of Sciences;
A quantitative analysis method via on-line mass spectrometry based on the equivalent characteristic spectrum analysis method was developed to analyze the NO reduction process of biomass char under fixed-bed isothermal conditions, and mass flow rate of each gas during the reduction process were determined. The results show that the quantitative method could accurately calculate the flow rate of each gas even though there are ion currents overlapping at mass-to-charge ratio when CO,CO_2 and N_2 are simultaneously present in an on-line mass spectrometer. The accuracy of the quantitative method was determined by comparing the calculated mass flow rate values with the actual mass flow rate values. The effect of temperature on the NO reduction reaction of biomass char was investigated. The kinetic parameters of the reduction reaction were solved using the model fitting method. In the reduction of NO by biomass char, CO and N_2 are the main products, and more than 98 % of N in NO is converted to N_2. The mechanism function G(x) = 1-(1-x)~(1/2 )could describe the char conversion process in the NO reduction reaction when the temperature interval is 800-950 ℃. The activation energy of the reduction reaction was calculated to be 113.46 kJ/mol.
2024 S1 v.30 [Abstract][OnlineView][Download 1969K] - QIN Yue;LI Debo;QIN Wu;LIAO Weihui;TU Bo;LYU Xingcheng;LIAO Hongkai;Department of New Energy,North China Electric Power University;China Southern Grid Power Technology Co.,Ltd.;Guangdong Honghaiwan Power Generation Co.,Ltd.;
The load of coal-fired power generation units is variable under the current situation of energy utilization, and the online monitoring and operation evaluation accuracy of thermal power boilers needs increasing day by day. In order to obtain the operation parameters of high-precision units and broaden the selection method of suitable coal, the thermal system model of coal-fired boilers was constructed by Ebsilon16.4 simulation software based on experimental data. According to the coal type and quality, the heat change of each heat exchange component was calculated, and the influence of primary air temperature on the calculation of thermal system was analyzed. The results show that the simulation method is more accurate and convenient to obtain the boiler heating surface data under the actual engineering data. In the simulation results, the heat transfer of heat exchangers located in the center of the furnace, such as plate superheater and high temperature reheater, is relatively large, so the coal quality has a great influence on it. The primary air temperature indirectly changes the heat absorption of the heat exchanger by affecting the flue gas temperature, and the economizer and low-temperature reheater located in the shaft at the tail of the flue account for a relatively small amount of heat exchange, so the coal quality has little influence on it. At the same time, the parameter setting of the model and the simulation conclusion can provide a reference for the deep peaking of supercritical coal-fired units and the efficient acquisition of boiler data.
2024 S1 v.30 [Abstract][OnlineView][Download 1943K] - LUO Ranjie;YANG Weihao;LI Weijie;TU Yaojie;LIU Hao;Shanxi Taiyuan Stainless Steel Co.,Ltd.;State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology;WISfur Thermal Technology Co.,Ltd.;
This paper carries out a numerical simulation study on H_2-Air cross-jet flame, and the effects of air nozzle distance(L), angle(α) and number(N) on temperature, flame outline and NO_x emission are examined, and the optimal burner parameters for the lowest NO_x emission has been obtained. The results show that, enlarging L and α is beneficial for producing a more uniform temperature field as well as a lower temperature peak, which further results in a lower NO_x emission. Increasing N can enhance the mixing between fuel and air, and form a high temperature region in the central furnace owing to intensified combustion, which leads to increased NO_x emission. However, the central high temperature region is gradually stretched to the exit of the furnace with the increase of N, leading to a decrease of combustion efficiency from 99.99% to 98.99%. In the present combustion facility, the optimal burner parameters are L=6D, α=40° and N=2, through which H_2-Air cross-jet flame can maintain a high combustion efficiency of 99.99% while producing the lowest NO_x emission at 5×10~(-6).
2024 S1 v.30 [Abstract][OnlineView][Download 2033K] - HE Wenbing;LI Xingzhi;XU Ya;QI Tunshuo;LI Yingui;Qinhuangdao Thermal Power Co.LTD.;Thermal Power Research Institute Co.,LTD.;China Resources Power Yichang Co.LTD.;
Guizhou lean coal boilers are used in the project of 2×350 MW generator-units of China Resources Power Yichang power plant, which has the trend of mid-slagging.Serious slagging and fouling and burner burning out occurred in China Resources Power Yichang power plant when burning Jingbian coal.In order to study the combustion characterisitics and the slagging characteristics of jingbian coal, and the coal adaptability for boiler, it was decided to study combustion Characteristics of Jingbian Coals in One-dimensional Flame Furnace and Sintering characteristic of coal ash. The results show that Jingbian coal belongs to a type of high-quality power generation coals, having lower ignition temperature and higher burn-out rate. having the serious slagging and fouling characteristic because of the high content of metal oxides such as calcium, iron, and sodium in the coal ash, and low fusion temperature. Compared with the original design coal, the ignition and burnout characteristics of Jingbian coal are better, but the slagging and fouling characteristics are enhanced. During the renovation process, the burners was adjusted based on the coal combustion characteristics, and the addition of 26 steam soot-blowers in the furnace area, 10 steam soot-blowers in the boiler horizontal flue, 10 steam soot-blowers in the boiler tail flue, and an overall combustion experiment is carried out. the aim that lighten slagging is achieved by optimizing reformation of equipmet and combustion experiment, the mixing proportion of Jingbian coal has increased from 12.5% to 75%,the Inlet smoke temperature of the Air Heater decrease by 30.4 ℃,the exit smoke temperature of the Air Heater decrease by 25.5 ℃,The carbon content of fly ash before and after reform is not changed basically, The concentrations of NO_x was decreased from 705 mg/m~3 to 384 mg/m~3,and the boiler efficiency was increased by 1.49%. The annual fuel cost is expected to save approximately 2.8 million yuan.The boiler steam water system and the flue gas system have good availability to 75% Jingbian coal. The adaptability of the boiler to fuel can be enhanced by equipment modification.Significantly expand the boiler′s adaptability to coal and alleviate the difficulty of coal purchase.
2024 S1 v.30 [Abstract][OnlineView][Download 1944K] - ZHANG Rui;CUI Xiangzheng;WANG Jianhao;ZHAO Yao;YIN Weihua;CHEN Quanxi;ZHAO Yongchun;ZHANG Junying;CHN ENERGY Changyuan Hanchuan Power Generation Corporation Limited;National Key Laboratory of Coal Combustion and Low Carbon Utilization,Huazhong University of Science and Technology;China Energy Science and Technology Research Institute Co.,Ltd;Wuhan Sky Blue Environmental Protection Technology Co.,Ltd;
This paper conducts a research on heavy metal emission control based on a 350 MW coal-fired power plant in China, systematically analyzing the concentration distribution of heavy metals at different locations of coal-fired flue gas purification, and revealing the migration and transformation laws of heavy metals such as Se, As, and Pb. Research has shown that the concentrations of fine particulate Se, As, and Pb below 1 μm, 1～2.5 μm, and 2.5～10 μm at the ESP outlet are all below 0.80 μg/m~3,and the removal efficiency of fine particulate heavy metals by ESP exceeds 95%. Under the combined action of ESP and WFGD,the comprehensive removal efficiency of gaseous Se, As, and Pb is 75.62%,87.48%,and 40.20%,respectively. The concentration of gaseous heavy metals discharged into the atmosphere is significantly reduced. In addition, due to the high As content in the limestone slurry and process water, the As content in the desulfurization wastewater and gypsum of the unit reached 199.19 μg/L and 22.25 mg/kg, respectively, which needs to be taken seriously. Considering that the utilization and accumulation of coal by-products may cause environmental accumulation effects, if discharged directly without treatment, it will pose potential risks to the safety of the surrounding environment.
2024 S1 v.30 [Abstract][OnlineView][Download 1874K] - LI Lifeng;HE Xiangyu;PENG Jiaqi;National Energy Group Hunan Electric Power Co.,Ltd;School of Energy power and Mechanical Engineering,North China Electric Power University;
In order to optimize the operation level of units and improve the management ability of enterprises, a comprehensive evaluation system was established to evaluate the units.This paper evaluates the comprehensive management level of seven supercritical units, uses analytic hierarchy process(AHP) to analyze the weight of indexes, and uses grey management degree analysis(GRA) to evaluate.There is little difference in safety among units, some units have main steam over-temperature and pipeline over-temperature phenomenon, overall stability fluctuates greatly, safety is the premise of stability, except some units have serious NH_3 over-standard, the other units have a higher level of environmental protection; the economy and stability are closely related, and Unit D has the lowest ranking in stability and the lowest economic score; and the stability has the most obvious influence on the evaluation of comprehensive management level, unit E has the highest stability score and the highest comprehensive level ranking, while unit D has the lowest stability score and the lowest comprehensive level ranking.The comprehensive benchmarking evaluation of units can effectively reflect the differences in safety, stability, environmental protection and economy of units, and promote the improvement of production management level.
2024 S1 v.30 [Abstract][OnlineView][Download 1973K] - WU Yi;LIAO Jiankai;ZHANG Yaoning;CHEN Baoxia;LIU Fuzhong;YANG Tao;JIANG Rong;Huadian (Zhangping) Energy Co.,Ltd.;Long Xiang Yu (Shenzhen) Technology Co.,Ltd.;
In this study, we tested the coal saving effect of a catalyst on a mixture of anthracite, bituminous coal and lignite, which have complementary advantages. We used a 300 MW circulating fluidized bed boiler with a stable operating load of 240 MW. We found that adding the catalyst to the mixed coal reduced the standard coal consumption of power generation by 9.37 g/kWh or 2.90%. This was a significant improvement in coal efficiency. Moreover, the catalyst also reduced the residual carbon content in ash slag and fly ash by 26.04% and 18.20%,respectively, compared to the control period. This showed a significant reduction in emissions. The catalyst was effective for all kinds of coal.
2024 S1 v.30 [Abstract][OnlineView][Download 1902K] - ZHANG Yanwei;CAI Xiaofeng;LV Yanyan;WANG Jie;FAN Junjie;Shanghai Industrial Boiler Research Institute Co.,Ltd.;School of Environment and Architecture,Shanghai University of Technology;
Thisarticle takes a 91 MW coal-fired hot water boiler from a certain user in Shenyang as the research object. Two calculation software are combined to simulate the conventional operating conditions of the boiler and the power field, temperature field, oxygen concentration distribution, and NO_x generation of the flue gas above the grate after two ways of denitrification transformation. The comparison is made between the non flue gas recirculation, the circulating flue gas entering the grate above the six small air chambers, and the circulating flue gas entering the grate from the first and second air chambers, respectively There are three different working conditions for the secondary air inlet to enter the furnace in a graded manner. The simulation results show that: When the boiler operates under conventional operating conditions, there are obvious uneven mixing areas in the flue gas, high average and local temperatures of the flue gas, high and uneven distribution of NO_x concentration; The circulating flue gas enters the upper part of the grate from the 6 th small air chamber, causing the uneven mixing area of the flue gas to become smaller and not completely disappear. The average temperature and local high temperature of the flue gas have slightly decreased, and the NO_xconcentration has decreased and the uneven distribution has improved; The circulating flue gas enters the furnace in stages from the primary and secondary air vents, and the uneven mixing of flue gas disappears. The average temperature of the flue gas is reduced by about 150 ℃ compared to conventional operating conditions, and the distribution of NO_x is uniform. The NO_x concentration at the furnace outlet is reduced by about 170 mg/m~3 compared to conventional operating conditions. The numerical simulation results of the conventional operating conditions of the boiler are completely consistent with the actual furnace tests, and the simulation results of flue gas recirculation can provide theoretical support for the boiler denitrification transformation.
2024 S1 v.30 [Abstract][OnlineView][Download 1948K] - HE Xin;YUAN Zongshuai;KONG Lingxue;LI Huaizhu;BAI Jin;GUO Zhenxing;SHEN Jun;LI Wen;School of Chemical Engineering and Technology,Taiyuan University of Technology;State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences;Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering;
The fusibity of coal ash is an important index of coal in gasification, and calcium-and iron-based fluxes are widely used in industry to reduce the fusion temperature of coal ash with high ash melting temperature. In this paper, industrial solid wastes containing calcium and iron including desul-furization gypsum, calcium carbide slag, red mud and steel slag were selected as fluxes, and the effects of the addition of industrial solid wastes on the fusibity of Lu'an coal ash with high melting temperature under high-temperature and weak reducing conditions were investigated, and the relationship between the addition of industrial solid wastes and the mineral composition of the ash was also analyzed. The results showed that all the ash fusion temperatures of Lu'an coal ash decreased with the addition of industrial solid waste, while it showed different effects. It was significantly decrased with the increase of the addition proportion of red mud and calcium carbide slag. The flow temperature(FT) of Lu'an coal ash was lowered to 1 376 ℃ and 1 392 ℃ when 8% red mud and calcium carbide slag were added. When the addition of steel slag and desulfurization gypsum was 2%,the FT of Lu'an coal ash was decreased to 1 380 ℃ and 1 410 ℃,while it slightly decreased with the increase of the addition ratio. When adding red mud, the content of mullite and silica in Lu'an coal ash decreased, and low melting point calcium iron pyroxene and iron spinel were generated. For the addition of calcium carbide slag, the main minerals at high temperatures were low melting point anorthite. When the steel slag was added, the mullite in the coal ash reacted with oxides and transformed into low melting point clinopyroxene and anorthite. For the addition of desulfurization gypsum, low melting point anorthiter was the main minerals at high temperatures. Considering the effect of industrial solid waste addition on ash fusibility and other components on gasification, steel slag and calcium carbide slag can be used as fluexs to reduce the ash fusion temperature of coal with high melting temperature in gasification, and the FT of Lu'an coal with high ash fusion temperature can meet the requirements of the fusibility of coal ash for the entranied flow gasifiers when the addition of steel slag, and carbide slag was 4%.
2024 S1 v.30 [Abstract][OnlineView][Download 2475K] - ZHANG Shihao;ZHANG Jinchun;Research Center for Energy Economy,School of Business Administration,Henan Polytechnic University;Department of Industrial Engineering,School of Business Administration,Henan Polytechnic University;
The scientific setting of key parameters is crucial to the stable and efficient operation of circulating fluidized bed reactor, and is an important basis for reactor performance optimization. In this paper, A three-dimensional full-loop simulation of the circulating fluidized bed reactor is applied to numerical simulation technology, and the simulation results are compared and analyzed with the experimental data. On this basis, a comprehensive analysis of the particle volume fraction and temperature effect in the circulating fluidized bed reactor was carried out for the key parameters(pulverized coal particle size, oxygen rate and material collection). Response surface analysis was applied to summarize the correlations between the interactions of the factors and the target variables. The results indicate that: oxygen rate has a significant effect on both particle volume fraction and temperature in the reactor; pulverized coal particle size only has a significant effect on particle volume fraction; material collection has a significant effect on particle volume fraction and a weak effect on temperature; the interaction between pulverized coal particle size and oxygen rate has a more significant effect on particle volume fraction in the reactor. In practical engineering applications, adjustment of oxygen rate and change of pulverized coal particle size can be considered to improve the circulating fluidized bed reactor material circulation efficiency. In addition, the temperature variation in the circulating fluidized bed reactor can be controlled by adjusting the oxygen rate.
2024 S1 v.30 [Abstract][OnlineView][Download 2123K] - PENG Maofeng;QI Zhantong;ZHAO Chunhui;SONG Guangxiong;GU Yujiong;School of Energy,Power and Mechanical Engineering,North China Electric Power University;
Accurate prediction of NO_x concentration and quantified injection of ammonia are crucial for increasing the efficiency of Selective Catalytic Reduction(SCR) systems and reducing NO_x emissions. However, the Continuous Emission Monitoring System(CEMS) used to measure NO_x concentration in power plants has significant delay issues. Therefore, long sequence prediction tasks of NO_x concentration are necessary. This paper introduces a novel data-driven hybrid approach, based on Empirical Mode Decomposition(EMD) and the Informer model, for predicting the SCR inlet NO_x concentration of a 300 MW subcritical natural circulation drum boiler as the research subject. This model employs Empirical Mode Decomposition(EMD) to decompose the original historical data into a series of component sequences, effectively separating trend signals from noise signals. Subsequently, the Informer model is used to predict each component, and these predictions are then reconstructed to form the predicted NO_x concentration. Compared to other deep learning prediction methods, this model exhibits outstanding performance in long sequence forecasting tasks, offering a promising approach for precise control of Selective Catalytic Reduction(SCR) systems for denitrification.
2024 S1 v.30 [Abstract][OnlineView][Download 2118K] - WU Sheng;ZHANG Zhiqiang;LI Zhibing;WANG Xiaowei;LIU Man;China energy science and technology research institute Co.,Ltd;Shanxi Institute of Coal Chemistry Chinese Academy of Sciences;
In response to the problems of large bed temperature deviation, high combustible content of fly ash and large slag, and high power consumption of auxiliary equipment during the operation of a 300 MW fluidized bed boiler in a power plant, combustion optimization adjustment tests were conducted from the aspects of fuel particle size, operating oxygen content, primary air volume, secondary air distribution method, and operating bed pressure.The experimental results show that the main factors affecting the bed temperature deviation are fuel particle size, operating oxygen content, air chamber pressure, and the ratio of upper and lower secondary air, which have a significant impact on the combustible content of boiler fly ash and large slag. It is recommended to maintain an oxygen content of around 2.95% on the dial during operation under a load of 300 MW,and to use a 70%/70%/100%/100% positive tower air distribution method for the opening of the upper and lower secondary air valves. The air chamber pressure should be operated at around 12.5 kPa. The research results can provide guidance for optimizing the operation of similar units.
2024 S1 v.30 [Abstract][OnlineView][Download 1803K] - YAN Ge;ZHANG Jianhua;HOU Yan;JIAO Qinghang;HAN Baogeng;CAO Wei;XU Tao;DU Zhihua;LIU Jiali;ZHANG Xiangyu;FANG Shunli;WANG Zhichao;Beijing Electric Power Equipment Factory Co.,Ltd.;Huaneng Group Chaohu Power Plant;Xi'an Thermal Power Research Institute Co.,Ltd.;
A certain 660 MW unit in the Philippines was using local lignite coal and encountered serious slagging issues during the boiler trial operation, which affected the load capacity of the unit and posed safety risks. In view of this, coal sampling was carried out and the coal quality, ignition, burnout, slagging, fouling, and other properties were analyzed in the laboratory. The coal quality analysis results showed that although some ash components of the tested coal samples exceeded the design coal quality parameters, other coal quality parameters were within the design range, indicating a certain representativeness of the coal samples. The combustion performance test results demonstrated excellent ignition and burnout performance of the coal samples. It should be noted that the tested coal ash had high content of alkaline oxides(Fe_2O_3,CaO,MgO),resulting in severe slagging performance. The test coal samples exhibited a strong tendency for slagging when the coal fineness(R_(90)) varied between 20%～40% and the operating oxygen content ranged from 2.5%～4.5%. After understanding the coal quality characteristics, a survey and analysis of the design and actual operation of domestic boilers using similar coal types were conducted. Additionally, numerical simulation calculations of the combustion state inside the boiler using the experimental coal for the unit were performed. The comprehensive analysis results indicated that this type of coal with high alkaline oxide content had a severe tendency for slagging, and the boiler had the following issues:(1) slightly oversized cross-sectional heat load, combustion zone wall heat load, and furnace volume heat load, while the furnace volume was relatively small;(2) excessive burnout fraction and bias angle of the secondary air;(3) absence of soot blowers in the combustion zone area;(4) higher temperature at the lower screen and the entrance of the rear screen, among other problems. Due to the strong slagging propensity of the tested coal samples, it was not possible to achieve long-term full-load safe combustion of the tested coal samples under the existing boiler design conditions. To improve the adaptability of the boiler to severe slagging coal, it is recommended to modify the burners, increase the arrangement of soot blowers, and conduct combustion optimization adjustment tests to ensure a good combustion structure and effective soot blowing inside the furnace.
2024 S1 v.30 [Abstract][OnlineView][Download 2017K] - ZHOU Yu;PENG Wenguo;MA Qingwang;LIN Qizhao;School of Physics and Electrical Engineering,Liupanshui Normal University;Liupanshui Hongguo Development Zone Longding Industry and Trade Co.,Ltd.;School of Engineering Science,University of Science and Technology of China;
Coal gangue is a kind of industrial solid waste formed in the process of coal mining and coal washing. A large amount of coal gangue is dumped and deposited in the mining area, occupying a large amount of land resources. If not properly disposed, it will pollute the ecological environment. Combustion disposal can realize the reduction and resource utilization of coal gangue, reduce environmental pollution and save coal resources. As a clean fuel, biomass is one of the alternatives to coal. Adding biomass can help improve the combustion performance of coal gangue and reduce net carbon emissions. In this paper, the co-combustion experiment of coal gangue particles with Rosa roxburghii Tratt pomace in air atmosphere was carried out in a tubular vertical heating furnace. The effects of different blending ratios and atmosphere temperature on the co-combustion characteristics such as ignition mechanism, ignition delay, ignition temperature and burnout time were studied. The results showed that the addition of Rosa roxburghii Tratt pomace significantly improved the particle combustion characteristics, especially at high temperature and high R.roxburghii pomace content. With the increase of the blending ratio of Rosa roxburghii Tratt pomace, the internal ignition temperature of the blended particles of coal gangue and Rosa roxburghii Tratt pomace decreased, and the combustion time of volatile matter was significantly prolonged. With the increase of atmosphere temperature and the addition of Rosa roxburghii Tratt pomace, the ignition delay was significantly reduced, and the volatile matter of Rosa roxburghii Tratt pomace accelerated the ignition and combustion under high temperature conditions.
2024 S1 v.30 [Abstract][OnlineView][Download 2015K] - ZHANG Jida;YANG Junhui;MIAO Changsheng;HONG Dikun;China Coal Tianjin Design Engineering Co.,Ltd.;Department of Power Engineering,North China Electric Power University;
The safe and efficient utilization of low concentration CH_4is of great significance for carbon reduction in the coal industry.However,the explosive nature greatly limits the safe utilization of low concentration CH_4.Previous studies have extensively investigated the effects of additives such as N_2,CO_2,and H_2O on CH_4explosions,but there is little research on the effect of NH_3addition on CH_4explosion.This paper used thermodynamic and reactive molecular dynamics methods to study the effect of NH_3on CH_4explosion.Based on the adiabatic combustion temperature theory,the lower flammability limit of CH_4/NH_3mixture at different temperatures was studied.The influence of NH_3addition on the oxidation rate of CH_4and the distribution of products such as CO and CO_2were investigated through reactive molecular dynamics methods.Based on the comparative analysis of the evolution of free radicals in methane/air and methane/ammonia/air systems,the mechanism of the influence of NH_3on CH_4explosion was revealed.The results show that the lower flammability limits decreased with the increase of the initial temperature,and the addition of NH_3increased the lower flammability limits,thus inhibiting the explosion of the mixture gas.The inhibition effect of NH_3on the explosion of the mixture gas was more obvious with increasing NH_3concentration.The addition of NH_3reduced CH_4oxidation rate,and inhibited the generation CO_2and H_2O.NH_3promoted the consumption of OH free radicals and reduced the concentration of OH free radicals,thus inhibiting the reactions of ■
2024 S1 v.30 [Abstract][OnlineView][Download 1926K] - WANG Xingang;YU Zhiyong;WU Gaolei;ZHU Zimin;WANG Yinan;CHEN Heng;State Grid Xinjiang Electric Power Company Limited;Economic Technology Research Institute,State Grid Xinjiang Electric Power Company Limited;Electric Power Research Institute,State Grid Xinjiang Electric Power Company Limited;College of Energy,Power and mechanical Engineering North China Electric Power University;
Existing carbon capture technologies have significant energy consumption and cost burdens that are difficult to bear. Meanwhile, the amount of urban solid waste in China has been rapidly increasing in recent years. Incineration of waste is considered a suitable waste treatment and energy recovery technology. However, compared to coal-fired power plants, waste incineration has lower thermal efficiency, resulting in certain energy waste. Therefore, in order to reduce the heat consumption of carbon capture and improve the thermal utilization of urban solid waste, an innovative coupling system is proposed, which integrates waste-to-energy plants, coal-fired power plants, and carbon capture technologies based on the principle of energy cascade utilization. The specific innovations are as follows:(1) The high-grade heat from the combustion of urban solid waste is used to reheat the steam in the coal-fired power plant, thereby improving its efficiency.(2) The low-grade heat from the combustion of urban solid waste is utilized in the reboiler of the carbon capture system, reducing the heat loss caused by steam extraction.(3) Due to system integration, the equipment of the waste-to-energy plant is streamlined, reducing system complexity and avoiding some energy losses. Based on the design parameters of existing power plants, reference system modeling and coupling scheme design were carried out, and the innovative system was evaluated using energy analysis and exergy analysis. The results show that the proposed coupling system increases the net power generation thermal efficiency by 0.66%,the exergy efficiency by 0.64%,and the net power generation capacity by 5.39 MW.
2024 S1 v.30 [Abstract][OnlineView][Download 1951K] - ZHAO Haibao;HOU Zhengwei;QIAN Shuijun;REN Chiyin;FANG Yanhui;LIU Yonghua;LIANG Dongfang;WEI Xinghua;Zhejiang Feida environmental science & technology CO.,Ltd.;Key Laboratory of Coal-fired flue gas purification equipment research of Zhejiang Province;Huaizhe Coal & Electricity Fengtai Power Co.,Ltd.;Huaizhe Coal & Electricity Fengtai Power Co.,Ltd.Anhui 232131 .China;
Clean, efficient, advanced and energy-saving coal-fired power is an important support for the new energy system in China, and energy conservation and emission reduction are the key tasks for thermal power plants in the future. Performance testing and analysis were conducted on the electrostatic precipitator(ESP) of a 660MW unit in Fengtai Power Plant. It was found that the high concentration of smoke and dust in channel A and channel B at the outlet of the ESP resulted in an overall high concentration of smoke and dust. The flow field in channel A and channel D at the inlet of the ESP was uneven, and some power supply zones have been decommissioned. The average concentration of smoke and dust at the outlet of the ESP exceeded the design requirements at 81 mg/m~3. In this context, the double V-shaped uniform gas current ESP technology has been developed and modified, and the high-voltage power supply and flue guide plate have been restored for maintenance. After the modification, the dust concentration at the outlet of the ESP has been reduced to below 10 mg/m~3. Comparative experiments have shown that the double V-shaped uniform gas current ESP technology has significant effects on improving the efficiency of uniform flow and dust collection, and can be used as a choice for the renovation of ESP in old coal-fired power plants and other fields.
2024 S1 v.30 [Abstract][OnlineView][Download 1822K] - SHAO Yaru;GAO Rongze;WU Zhiqiang;LI Yuhang;WANG Chang′an;WANG Limin;CHE Defu;School of Energy and Power Engineering, Xi′an Jiaotong University;School of Chemical Engineering and Technology, Xi′an Jiaotong University;Xi′an Thermal Power Research Institute Co., Ltd.;
The absorption of CO_2 by alcohol amine solution is the most commonly used method for carbon capture from fixed carbon emission sources in industry. However, the energy consumption in the capture process has always been a major obstacle to its large-scale application. By increasing the content of CO_2 in the flue gas at the inlet of the chemical absorption method, the absorption efficiency can be improved, and the energy consumption can be reduced to a certain extent. There are many kinds of alcohol amine solutions, among which monoethanolamine(MEA) and methyldiethanolamine(MDEA) have attracted much attention due to their good performance. Researchers have extensively studied the capture performance of alcohol amine solutions in coal-fired flue gas, but few studies have been conducted on the effect of absorbents on reducing capture energy consumption under other flue gas conditions. In order to study the applicability of MEA/MDEA blended amine solution under different carbon capture scenarios and obtain the optimal ratio of MEA/MDEA blended amine solution under different carbon capture scenarios, a post-combustion carbon capture system with an annual CO_2 capture capacity of 500 000 tons was built by Aspen Plus. The effects of key operating parameters such as lean liquid load, absorption pressure and desorption pressure on amine flow rate, rich liquid load, cycle capacity and regeneration energy consumption of blended amine solution in the capture process were compared and analyzed, which provided a basis for the selection of operating parameters in the capture process under different working conditions. At the same time, the capture performance of blended amine solutions with different carbon capture scenarios and different ratios was studied in depth. The results show that the performance of blended amine solutions with different ratios under the same carbon capture scenarios is quite different. The MEA/MDEA solution with a ratio of 1:4 is most sensitive to the change of CO_2 concentration. When the mass concentration of CO_2 increases from 5% to 55%, the regeneration energy consumption decreases by 40.07%. Finally, the optimal ratio of blended amine solution suitable for different carbon capture scenarios was obtained by analytic hierarchy process(AHP): in a carbon capture scenario with a CO_2 mass fraction of 5%, the MEA/MDEA blended amine solution with a mass ratio of 4:1 has the best performance; in the carbon capture scenario with a CO_2 mass fraction of 15% in the flue gas, the blended amine solution with a mass ratio of 2:3 has the best performance; in the carbon capture scenario where the mass fraction of CO_2 in the flue gas is 25%-55%, the blended amine solution with a mass ratio of 1:4 exhibits the best performance.
2024 S1 v.30 [Abstract][OnlineView][Download 1985K] - ZHANG Jianhua;CHN Energy Zhunneng Institute of Science and Technology;
The coal unloading process in the crushing station of open-pit coal mine will produce a lot of dust and spread into the air, which will threaten the health of operators and the service life of large machinery, and cause great harm to the environment. The study of dust diffusion law is of great significance to the dust prevention and control of receiving hopper in crushing station. In this paper, the diffusion law of dust particles in the hopper and its vicinity is studied by means of field measurement and numerical simulation. The results show that the diffusion of dust is mainly caused by fine particles of 10-100 μm. Particles are mainly concentrated in the area near the wall of the receiving hopper. When the discharging height is 7.1 m from the upper edge of the receiving hopper, the dust can spread to a height of 11 m above the upper edge of the receiving hopper.
2024 S1 v.30 [Abstract][OnlineView][Download 1979K] - SHAO Yanwei;GONG Hongqiang;SUN Jiaxing;ZHAO Ronghang;Jiangsu Guoxin Yangzhou Power Generation Co.;
The problem of SO_3 emission from coal-fired flue gas is becoming more and more serious, and alkaline absorbent injection technology is expected to be applied to industry as an effective control method. Currently, a large amount of calcium-based absorbent is consumed to achieve high SO_3 removal efficiency, which makes the process costly; sodium-based absorbent has faster reaction kinetics, but it is prone to produce corrosive and viscous sodium sulfite and sodium bisulfate during SO_3 removal, resulting in equipment corrosion and clogging. In order to avoid the above problems, the alkaline absorbent was compounded according to n(Ca(OH)_2)∶n(Na_2CO_3)∶n(SO_3)=5∶1∶1, and the dry injection technology was used to remove SO_3 from the flue gas.Ca(OH)_2 as the main absorbent can ensure that the solid particles and gas molecules in the process of spraying are in full contact with the gas molecules, to increase the probability of gas-solid reaction; doping a small amount of Na_2CO_3 can further improve the reaction rate of the absorbent, and increase the conversion rate of the absorbent in a short period of time. Under the same conditions, the removal rate of SO_3 by the compound absorbent is higher than that of pure Ca(OH)_2. When the initial concentration of SO_3 is 39.2 mg/m~3 and the flue gas temperature is 360 ℃, the SO_3 removal rate can reach 88.7%. Under the premise of ensuring the SO_3 removal rate, the consumption of Ca(OH)_2 can be reduced by 50%, which lowers the industrial production cost and also reduces the corrosive and viscous by-products produced after the removal of SO_3 by Na_2CO_3. In addition, prolonging the absorbent residence time, increasing the flue gas temperature, and higher initial SO_3 concentration will improve the SO_3 removal efficiency, which provides a theoretical basis for the removal of SO_3 from flue gas in coal-fired power plants.
2024 S1 v.30 [Abstract][OnlineView][Download 1886K] - JIN Wangzong;QIN Feng;LI Tao;ZHANG Yaofeng;TIAN Shuai;GUO Jian;TAN Houzhang;WU Lituo;LV Zhaomin;CHENG Shangfang;Inner Mongolia Guohua Zhungeer Power Generation Co.,Ltd.;MOE Key Laboratory of Thermo-Fluid Science and Engineering,School of Energy and Power Engineering, Xi′an Jiaotong University;Xi′an Gree Power Technology Co.,Ltd;
In response to the problem of monitoring and early warning of large coal-fired power plants that lead to stagnation of the fan, this study starts from the perspective of thermodynamics, focusing on evaluating the real-time operation status of the fan, combined with the thermal performance correction experimental data of the fan, using the C# language framework to build a complete set of information collection and online intelligent detection real-time early warning platform. The on-site test verification was completed on a certain 330 MW sub-critical unit. The operation results of the platform show that the improved multi-point matrix measurement equipment can achieve accurate and reliable measurement of wide cross-section non-stable dust-containing flow fields, with errors below 10%; The resistance curve comprehensively judges the current fan operation performance, achieves timely early warning, and provides accurate data guidance for on-site operators, and has the value of promotion.
2024 S1 v.30 [Abstract][OnlineView][Download 2039K] - JIN Xiaoyu;LIU Jinfang;JING Jiaxin;DONG Xiaoyu;SHI Yong;LI Haiyan;XUN Wenjie;WANG Yugao;YANG Jiangfeng;Shanxi Coking Coal Group Coking Coal Clean Utilization Co.,Ltd.;College of Chemistry and Chemical Engineering,Taiyuan University of Technology;Shanxi Coking Coal FenXi Mining Industry;Shanxi ShuGuang Coal Mine;
The efficient separation of CH_4/N_2 from coalbed methane(CBM) is of great significance for the realization of the "double carbon" goal and the supplementation of low-carbon energy. Coal-based porous carbon materials can be prepared by utilizing China′s abundant coal resources and can be used for the adsorption and separation of CH_4/N_2 in CBM. In this paper, coal-based porous carbon materials were prepared for the adsorption and separation of CH_4/N_2 by using highly coalized coal as raw material, which was treated with hydrofluoric acid de-ashing, mixed with KOH and activated at high temperature. The results of the study showed that the BET specific surface area of the porous carbon prepared from de-ashed coal was 1 307 m~2/g at an alkali(KOH) to coal ratio of 2∶2 and an activation temperature of 800 ℃, and the pore size was concentrated at 0.54 nm. The adsorption capacity of methane at 1×10~5 Pa and 298 K is 27.6 cm~3/g, and the IAST selectivity is 4.43, which is much higher gas adsorption and separation performance than that of unde-ashed coal-based porous carbon under the same experimental and testing conditions. Penetration experiments of CH_4/N_2(50%/50%) binary mixtures were simulated based on IAST selectivity using ASPEN software, and the long penetration time interval(50 s) between the two suggests that the porous carbon materials prepared from de-ashed coal are practically effective for separation.
2024 S1 v.30 [Abstract][OnlineView][Download 1911K] - WANG Long;XIA Yongjun;HAN Jinke;PENG Bo;ZENG Jiawei;WU Jianqun;GUO Xiuwen;HUANG Zhaoxin;YU Dunxi;Jxic Energy Tech.Research Institute Co.,Ltd.;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology;
Desulfurization wastewater is a pollutant that coal-fired power plants produce during production and operation. To save the natural environment, this wastewater must be cleaned and treated. Because of its stable system and high efficiency, hot flue gas evaporation technology is extensively used for desulfurization wastewater treatment. Some power plants also utilize rotary atomization evaporation technology to achieve zero discharge of desulfurization wastewater. To assess how this evaporation system affects the boiler′s thermal efficiency and the air preheater′s performance, a 660 MW ultra-supercritical coal-fired unit was used in a field experiment, at 400 MW(system out and into operation) and 660 MW(system operation), boiler flue gas temperature and composition were monitored, and laboratory tests were used to assess the incoming coal, fly ash, slag, and desulfurization wastewater. The thermal efficiency of each working condition was obtained by the counter balance calculation method, and the air preheater performance was evaluated under each working condition according to the results of the calculation of the combined cold end temperature and air preheater performance correction. The results show that under 400 MW, the thermal efficiency is 95.11% when the evaporation system is out of operation, 95.08% when the evaporation system is in operation, and the boiler thermal efficiency is reduced by 0.03% after system operation. The system could evaporate 4.72 m~3/h wastewater of under 400 MW after operation, and 6.93 m~3/h under 660 MW. The system can extract less flue gas to treat more desulfurization wastewater under the high load, it is more favorable to put the system into operation. The carbon content of the ash slag has changed after the system is put into operation, which indicates that the system operation will have an impact on boiler combustion. While the system is in operation, the combined temperature of the cold end of the air preheater is lower, and it is necessary to pay attention to the air preheater differential pressure during the operation, to avoid the occurrence of air preheater blockage that will jeopardize the safe operation of the unit.
2024 S1 v.30 [Abstract][OnlineView][Download 1937K] - DONG Jianning;ZHANG Qijun;CHEN Heng;FENG Fuyuan;PAN Peiyuan;XU Gang;WANG Xiuyan;LIU Tong;School of Energy and Power Engineering,North China Electric Power University;
Responding to the "dual carbon" target(Carbon Peaking and Carbon Neutrality Goals),quite a few experts and scholars have researched and analyzed load dynamics of AGC(Automatic Generation Control) thermalpower units with mathematical models or simulation software to improve operational flexibility of the units. As one of the prevailing research methods, deep learning is applied to a large data set of traditional thermal power units to smoothly build a more targeted and precisedata model for load dynamics of AGC thermal power units in order to analyze and optimize the dynamic performance of the units. In this regard, the GRU(Gated Recurrent Unit),with a better performance, was chosen to model load dynamics of thermal power units through the comparation of different RNN(Recurrent Neural Network) frameworks. Henceforth, the accuracy of the model was improved by utilization of traversal method. And multiple validations toward the model were conductedon the ground ofcombination of physical simulation model and the data set. As a result, the data model based on the GRU is qualified to simulate boththe operation of thermal power units in loads dynamics in practiceand AGC load dynamics in accordance with various load instruction groups so as to further optimize the instruction group with a better performance among others. Given to the simulation results, the accuracy of the adjustment is elevated by 28.4% during the process of increasing the load of 75% to 100% THA(turbine heat acceptance),and 17.8% during the counter process of reducing the load of 100% to 75% THA.
2024 S1 v.30 [Abstract][OnlineView][Download 1964K] - ZHANG Huangtong;LI Jia;CHEN Kun;YANG Nan;Nanjing Power Supply Company,State Grid Jiangsu Electric Power Co.,Ltd.;
This research employs a data-driven approach to explore the modeling and optimization of electrical energy consumption in cement production systems. Given the complexity and non-linear characteristics of the cement production industry, traditional mechanistic analysed struggle to establish precise models. The study utilized a combination of BP neural networks and genetic algorithms to successfully construct an electrical energy consumption model and perform parameter optimization. Seven crucial controllable parameters were selected for optimization, resulting in a significant reduction in electrical energy consumption through genetic algorithm optimization. This method allows cement production companies to systematically reduce electrical energy consumption, lower production costs, and enhance economic benefits. Moreover, this approach holds promise for widespread applications beyond energy consumption prediction and optimization. Future research directions include further enhancing the model's performance and stability and exploring additional optimization algorithms to improve the efficiency and precision of parameter optimization. In conclusion, this study introduces a novel approach for electrical energy consumption prediction and optimization, offering positive economic benefits and valuable insights for similar issues in various domains.After optimization by genetic algorithm, the minimum electric energy consumption value of cement production is reduced to 90 kWh/t, which is about 4 kWh/t less compared with the actual operation of 88-115 kWh/t, indicating that the optimization is effective. The recommended values of key parameters help cement companies to optimize the production system in a targeted manner to reduce electrical energy consumption and production costs.
2024 S1 v.30 [Abstract][OnlineView][Download 1922K] - ZHANG Jianhua;HU Jinliang;LIU Xiao;Guoneng Zhuneng Group Co.,Ltd.;
Coal dust pollution in open-pit mines has become a serious environmental problem. Because the wettability of water to coal dust is not high, the spray dust removal technology of crushing station is usually difficult to solve this problem. Therefore, the improvement of wettability of coal dust by surfactant was explored. Through molecular dynamics research, it is found that the surfactant compound has a more obvious effect on the hydrophilicity of coal dust than a surfactant. Based on this, a compound reagent of anionic-nonionic surfactant was studied, and the best ratio was determined through experiments. The ratio of SDS∶Tween-20 is 4∶2. The results show that the optimum concentration of the compound agent is 1 000×10~(-6) Tween-20 and 3 000×10~(-6) SDS solution to enhance the wettability of coal dust.The Zeta potential of coal dust particles increases slowly under the action of non-ionic surfactants, which is different from that of anionic surfactants. The research provides reference value for the application of chemical dust suppressants in spray dust removal technology.
2024 S1 v.30 [Abstract][OnlineView][Download 21729K] - HUANG Bocheng;WANG Guangyu;ZHANG Kai;Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation,North China ElectricUniversity;
High moisture content of Zhundong coal is not conducive to subsequent thermal and chemical utilization processes such as combustion, pyrolysis, and gasification. Drying and dehydration are the prerequisites for achieving its efficient utilization. Therefore, the moisture content of Zhundong coal was investigated. The synchronous thermal analysis method was used to investigate the forms and contents of water in Zhundong coal. Different types of water were identified through the characteristics of DDTG(second derivative of TG over time) and DDSC(first derivative of DSC over time). The free and bound water contents were found to be 1.32% and 3.78%,respectively. The effects of initial mass, particle diameter, heating rate and temperature on the moisture release process of Zhundong coal were investigated. The results show that with the increase of the initial mass, the moisture removal rate of Zhundong coal increases from 5.63% to 5.99%. The weight loss rate in the range of 0-2 mm increases with the increase of the particle size. The weight loss rate in the range of 2-4 mm decreases with the increase of the particle size, which leads to the extension of the water release path and the decrease of the water diffusion coefficient. Due to the increase of the heating rate, the internal heat transfer process of the coal sample is strengthened. The weight loss rate gradually increases from 0.0822%/min to 0.347%/min with the increase in heating rate(0.5-3.0 K/min),accompanied by a lag phenomenon in the peak of water release rate in Zhundong coal. Due to the increase in the final heating temperature, water molecules release energy. As the temperature increases from 50 ℃ to 105 ℃,the total amount of water release increases by 25.6%.
2024 S1 v.30 [Abstract][OnlineView][Download 8162K] - CHEN Haijie;MA Xiaoyue;WEI Xin;ZHOU Hao;ZHAN Lingxiao;YANG Linjun;Datang Environment Industry Group Co.,ltd.;Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University;
Concentrating desulfurization wastewater can reduce the coal consumption of bypass high-temperature flue gas evaporation process. However, there are few reports on the composition changes and corrosion risks during the concentration of desulfurization wastewater. In this study, the water quality variations during the concentration process of desulfurization wastewater were investigated using a low-temperature flue gas waste heat concentration platform. Particle size analyzer and morphology characterization were used to analyze the solid precipitation during concentration. Meanwhile, the corrosion risks of different metal materials in the concentrated wastewater were characterized by the annual corrosion rate. The results revealed that the wastewater temperature increased and stabilized during the concentration, while the conductivity continuously increased up to 45 mS/cm and the pH could decrease to as low as 1-2. Most ion concentrations showed a linear growth trend, but fluctuations were observed in the concentrations of Ca~(2+) and SO_4~(2-) due to crystallization precipitation and influences of coexisting ions. The agglomeration of precipitated particles during concentration was observed, with the size distribution gradually changing from unimodal to bimodal and the peak particle size increasing from 12 μm to 75 μm. The corrosion of metal materials was related to the concentration ratio and temperature. Specifically, when the concentration ratio was 4.5 and the water bath temperature was 40℃, the corrosion rate of 304 stainless steel(0.127 mm/a) was much lower than that of 20# carbon steel(1.211 mm/a) in concentrated wastewater, indicating superior corrosion resistance.
2024 S1 v.30 [Abstract][OnlineView][Download 13677K] - LI Qiao;DONG Yang;BO Feng;GONG Siyu;ZUO Ranfang;JIA Jianhui;National Institute of Clean-and-Low-Carbon Energy of CHN Energy;
The crystalline forms of calcium-containing phase in fly ash are diverse, and the active state of fly ash is correspondingly affected by the crystal phases containing calcium and their contents. When fly ash is used in cement, concrete and other building materials, its calcium-containing crystalline phases will also seriously affect stability, setting time, etc. In this paper, through the study of the particle size distribution and crystalline phases of four different fly ashes, as well as the changes of calcium-containing crystal phase of each ash withparticle size, it is preliminary determined that the distribution law of calcium-containing crystalline phase in fly ash is as follows: for fly ash with basically the same cumulative particle size, the particle size of circulating fluidized bed ash is single-peak distribution, and the particle size of pulverized coal furnace ash is bimodal distribution. Calcium sulfate crystals in calcium-containing crystalline phases are only present in circulating fluidized bed ash and are almost absent in pulverized coal furnace ash. Combined with the particle size, the calcium-containing crystalline phases of pulverized coal furnace ash are mainly Ca(OH)_2, CaO, and a small amount of calcium carbonate, all of which are concentrated in fine ash with a particle size of <0.106 mm. The calcium-containing crystal phase of circulating fluidized bed ash mainly includes Ca(OH)_2, CaO, calcium sulfate, calcium carbonate, and there are also calcium yellow feldspar and calcium ferrite in the ash desulfurized in the furnace. Circulating fluidized bed ash for desulfurization outside the furnace, Ca(OH)_2, CaO only exists in ash with a particle size of <0.044 mm, and only calcium carbonate in ash with a particle size of≥0.106 mm. The circulating fluidized bed ash of desulfurization in the furnace, the ash with particle size≥0.044 mm appeared calcium yellow feldspar, calcium ferrite and other minerals.
2024 S1 v.30 [Abstract][OnlineView][Download 2814K] - LIU Yushan;ZHOU Yangyuhang;WANG Xia;SU Wanli;LI Yiyi;GAN Shuyu;JOW Jinder;China Agricultural University;National Institute of Clean-and-Low-Carbon Energy;Ningxia Coal Industry Co.,Ltd.;Ningxia Guoxin Runda Analysis and Test Center (Co.,Ltd.);
In order to explore the feasibility of coal-gasification and coal-fired solid wastes to prepare planting substrate, in this paper, the fine and coarse slag from coal gasification, fly ash and bottom slag from coal combustion at Ningdong energy base in Ningxia Hui autonomous region were used to prepare the substrates and compare their effects of seedling formation and growth of alfalfa with three soils(sandy soil, loam soil and clay soil) by using the pot method. The changes in physicochemical properties of soils and substrates before and after planting were also analyzed. The results showed that sandy soil was beneficial to alfalfa seed germination and growth, fly ash compaction had a serious effect on seedling emergence, and small porosity and high phosphorus content of gasification fine slag resulted in low seedling emergence rate and seedling yellowing. The seedling emergence rate of alfalfa by sandy soil was the highest, followed by bottom slag, then by gasification coarse slag, loam and clay soils. The plant height and root length of alfalfa were the highest and close for sandy soil and gasification coarse slag which had similar physicochemical properties except the difference of organic matter content and phosphorus content. The plant height and root length of alfalfa planted with bottom slag were lower than those of gasification coarse slag and sandy soil. The study shows that the gasification coarse slag and bottom slag similar to sandy soil can be used as soil matrix to plant forage grass, which is of great significance to soil remediation and utilization of coal-based solid waste in Ningxia mining area.
2024 S1 v.30 [Abstract][OnlineView][Download 4763K] - HAN Bing;Tian Xiangfeng;JIN He;Longyuan (Beijing) Carbon Asset Management Technology Co.,Ltd.;
Coal-fired power plant integrated with the carbon capture by alcoholamine method not only can reduce the power generation and power generation efficiency of unit, but also can change the steam consumption characteristics curve of the unit. Therefore, it is significant to explore the effects of the thermal coupling of carbon capture system on the decarbonized turbine unit performance by off-design simulation, as well as to redraw the steam consumption characteristics curve of the decarbonized turbine unit. In this paper, a more accurate variable flow and pressure method, which takes into account both flow and pressure variation, was adopted to simulate the effects of decarbonized thermal coupling on the turbine unit in Jinjie power plant. The simulation results were compared with those of the variable flow and constant pressure method commonly used in current research. With the analysis results, the steam consumption characteristics of the decarbonized turbine unit were researched by the variable flow and pressure method to address the lack of research on the steam consumption characteristics of the decarbonized turbine unit, and the steam consumption characteristics curve was drawn to control the operating parameters. The simulation results show that, with 150 000 t/a capture scale, the power generation of decarbonized turbine unit simulated by variable flow and pressure method is 22 kW higher than variable flow and constant pressure method, with a difference of 0.04%,meaning the difference between of the simulation results by two methods is not significant. When the CO_2 in the flue gas from Jinjie power plant is captured in full(with 3 600 000 t/a capture scale),the power generation of decarbonized turbine unit simulated by variable flow and pressure method is 33.7 MW higher than variable flow and constant pressure method, with a difference of 5.61%. The simulation results of steam consumption characteristics of decarbonized turbine unit show that a higher capture scale leads to a lower power generation, which results a bigger variation of steam consumption characteristics of decarbonized unit. With the carbon capture rate are 4%(150 000 t/a capture scale),60%,80% and 100%,the maximum variation of steam characteristics curves of decarbonized turbine unit are 1.3%,11.85%,12.6%,13.2% respectively.
2024 S1 v.30 [Abstract][OnlineView][Download 2017K] - SONG Mingguang;LI Xiaojiang;SUN Youyuan;ZHENG Wenguang;GANG Liang;Huadian Electric Power Research Institute Co.,Ltd.;
In order to understand the differences in carbon emissions between online monitoring and accounting methods for thermal power units, and to analyze the data characteristics and influencing factors of online monitoring methods, four different types of thermal power units were selected to compare the carbon emissions and the carbon emissions intensity of power generation between online monitoring and accounting methods which contained coal-fired units with ultra supercritical capacity of 1 030 MW,supercritical capacity of 600 MW,subcritical capacity of 300 MW,and F class gas turbine unit. Regarding the key parameters of the monitoring method, the characteristics of CO_2 concentration and flow rate of flue gaswere studied and accuracyevaluation was conducted. The research results show that the CO_2 emissions obtained by the two methods are generally similar, but there is a significant difference between the two in each month of each unit. The relationship between carbon emission intensity and the average load rate of the unit indicates that the monitoring method results are relatively stable, while the accounting method has significant fluctuations. The results of accuracy evaluation show that the flow rate of flue gas is the key factor affecting the carbon emission results of the monitoring method, while the CO_(2 )concentration monitoring does not result in significant deviation. The flow rate monitoring results of flue gas with good uniformity present a higher accuracy than those of flue gas with bad uniformity.It also shows that the abnormal data of CO_(2 )monitoring systemcan be checked and diagnosed by fitting relationship between carbon emission rate, CO_2 concentration, flue gas flow rate and the average load rate of the unit, which can effectively ensuring the data quality of the monitoring method. It is concluded that the online monitoring method of carbon emission measurement in thermal power unit will be rapidly developed and applied in China in the context of the carbon market.
2024 S1 v.30 [Abstract][OnlineView][Download 1970K] - JIN Jianxin;YUAN Cenjie;XUE Xiaolei;TIAN Bing;ZHU Zhihui;QU Ziyao;Zhejiang Zheneng Jiahua Electric Power Generation Co.,Ltd.;Xi′an Thermal Power Research Institute Co.,Ltd.;
The medium-speed coal mill, which undertakes the task of grinding, drying and transportation of raw coal, etc.,is an important part of the coal pulverizing system in coal-fired power plants. The performance of air-coal distribution in the outlet pipes of the coal mill is directly related to the safe, stable and high-efficiency operation of the coal-fired power plants. Based on the CFD-DPM method, the gas-solid two-phase flow inside the coal mill was investigated under the conditions of full structure, full scale with the consideration of the rotational parts in actual operation. On the basis of grid-independent verification and model validation, the air-coal distribution characteristics in the medium-speed coal mill outlet pipes were investigated to reveal the causes of the uneven distribution of pulverized coal. Furthermore, the flow-guide block structure was proposed to set on the cylindrical wall of the coal mill at the height same as that of the separator inlet, in order to improve the uniformity of the air-coal distribution in the outlet pipes. The results show that the air ring region contributes the most to the mill resistance, while the resistances of the separator and the outlet pipe regions are close to each other, and the sum of the two accounts for 28.3%～29.4% of the mill resistance under the simulation conditions. The difference in the air velocity of the outlet pipes is very small, whereas the mass of pulverized coal differs greatly. The latter is due to the fact that the air-coal mixture is divided into three streams resulting from the hindering effect of the grinding rollers, so that the distribution of the air-coal mixture entering the separator cone is uneven. By setting the flow-guide block structure on the cylindrical wall of the coal mill, a significant improvement on the uniformity of the pulverized coal in the outlet pipes can be achieved.
2024 S1 v.30 [Abstract][OnlineView][Download 14573K] - JIRI gele;SUN Xin;Shenhua Group Zhungeer Energy Sources Co.,Ltd.,Coal preparation plant;College of Chemical and Environmental Engineering,China University of Mining and Technology;
Metal ions are the main influencing factors affecting the dust removal effect during the configuration and use of curing dust sealer, and the influences of mass concentration, metal ion concentration, and metal ion species on the surface potential and stability of the particles in its suspension during the settling process of the curing dust sealer were investigated. The results show that with the increase of the mass concentration of dust sealer, the surface negative potential of the solid particles in the suspension increases, and the stability of the system is enhanced; the metal cations affect the stability of the system by influencing the surface negative potential of the solid particles in the suspension, the larger the concentration of cations is, the larger the stability coefficient of the suspension TSI is. Different kinds of cations have different influence on the dust sealant suspension, and at the same concentration of cations, the destabilizing effect of dust sealant suspension is in the order of Fe~(3+)> Fe~(2+)> Ca~(2+) > Na~+.
2024 S1 v.30 [Abstract][OnlineView][Download 12070K] - ZHU Xiaojin;YI Hang;SU Zhigang;ZHAO Gang;ZHU Hongxia;ZhejiangZheneng Taizhou Second Electric Power Generation Co.,Ltd.;Department of Power Engineering and Automation, School of Energy and Environment, Southeast University;School of Energy and Power Engineering, Nanjing Institute of Technology;
In order to address the issues of high energy consumption and challenge of set-point control in the desulfurization process of a 1 000 MW coal-fired unit, we investigate a closed-loop control method for sulfur dioxide(SO_2) concentration at the outlet of the desulfurization tower. Firstly, a dynamic model between the frequency of the regulating pump inside the desulfurization tower and the outlet SO_2 concentration at different typical unit load points is established based on open-loop identification. Secondly, a closed-loop control scheme was introduced using a combination of Smith predictor and uncertainty and disturbance estimator(UDE), which can compensate for the large delay in the desulfurization process while enhancing the suppression capability of the closed-loop system against model uncertainties and external disturbances. Finally, based on sufficient robustness evaluation, the control parameters are determined. Simulation and application results show that the studied control method can achieve set-point control of the outlet SO_2 concentration of the coal-fired unit, and exhibit excellent transient response performance.
2024 S1 v.30 [Abstract][OnlineView][Download 1984K] - ZHOU Gang;ZHONG Jianfeng;ZHAO Haibao;ZHAO Chen;LOU Yigang;China Energy Investment Corporation,Yueyang Power Generation CO.,LTD;Zhejiang Feida environmental science &technology CO.,LTD.;Key Laboratory of Coal-fired flue gas purification equipment research of Zhejiang Province;
With the continuous development and improvement of digital environment and smart power plant construction, the demand for safe operation and early warning of dust removal equipment by major power companies is becoming increasingly strong. Through the research and application of stress and directional online monitoring, the structural change characteristics of electrostatic precipitators under overload are analyzed, and phased early warning indicators are found. A three-dimensional online model of electrostatic precipitator stress and a dynamic cloud map early warning interface are established, Develop an online monitoring system for the stress and strain of the ash hopper support of the electrostatic precipitator, achieving seamless connection with the control software of the electrostatic precipitator, and a hierarchical intelligent warning system for monitoring room sound warning, remote warning, etc.,and embed the intelligent dust removal control system. Based on the combination of intelligent dust removal, develop a monitoring system to improve the safety performance of the electrostatic precipitator, and add multiple lines of defense for the safe operation of the electrostatic precipitator, To further improve the safety, reliability, and proximity of the operation of electrostatic precipitators, and achieve an innovative mode of environmentally friendly and safe operation.
2024 S1 v.30 [Abstract][OnlineView][Download 4890K] - QIAO Zhizhong;HU Jingliang;DING Zhigang;Guoneng Zhoneng Group Co.,LTD.;
This paper aims to investigate more cost-effective and efficient wet dust removal technology within the realm of coal dust control during coal mining. The wettability of coal dust plays a crucial role in determining theconcentration, dispersion, and effectiveness of wet dust removal technologies. To address this, the paper delves into the process and microscopic mechanisms of coal dust wetting. It analyzes the impact of both the physical and chemical properties of coal dust and surfactants on coal dust wettability from a microscopic perspective. The goal is to provide a foundation and direction for the advancement of coal dust suppressors, as well as technology and equipment for coal dust prevention. Recognizing that coal dust poses a significant safety hazard in coal mine production and adversely affects employee health, in addition to contributing to ecological damage, this study holds immense significance. The findings aim to enhance the coal mining production environment, safeguard employee health, and mitigate environmental pollution.
2024 S1 v.30 [Abstract][OnlineView][Download 3924K] - LI Hailong;Shendong coal group National Energy Group General Dispatch office;
Based on the development of the times, especially after the widespread application of Internet of things and information technology, it is an inevitable trend for coal enterprises to realize“Digital and intelligent” management and control, more and more coal production enterprises promote the construction of intelligent production management based on their own actual conditions. At present, with the support of a large number of intelligent achievements, the production of fully mechanized coal face realizes the goal of automation. Taking the relevant information of Shendong coal calculation as an example, this paper probes into the feasibility and application advantages of realizing coal seam model modeling by computer, and constructs a set of 3D dynamic management system of fully mechanized coal face which meets the coal mine production demand, i hope the research of this paper can provide more reference for enterprises in the same industry, and help coal enterprises to further promote the optimization of intelligent production management model.
2024 S1 v.30 [Abstract][OnlineView][Download 4249K] - HU Jinliang;Guoneng Zhoneng Group Co.,LTD.;
In this paper, the property of coal dust, an important basic problem in dust removal technology of crushing station, is studied. Based on the coal dust from the large semi-fixed 3# crushing station in Harusu open-pit Coal Mine, the physical and chemical characteristics of the dust samples at different sampling points, such as concentration, particle size, moisture content and cohesiveness, were analyzed. At the same time, the influence of unloading material moisture, unloading height and the shape of the pit on the dust concentration was investigated. The results show that the dust mainly originates from the discharge process, and the dust at the detection point is weak and hydrophilic. The moisture content of the discharged material and the discharge height are the key factors of the coal dust concentration, and the influence of the two on the coal dust generation mechanism has different physical nature. When the moisture content of unloaded materials is high, the adhesion between particles increases, thus reducing the generation and diffusion of coal dust. The increase of unloading height will intensify the impact and friction of materials, and further enhance the generation of coal dust. The dust concentration produced by the vertical discharge hopper is higher than that of the V-type discharge hopper. This study provides useful reference and guidance for improving the efficiency of coal mine dust removal device.
2024 S1 v.30 [Abstract][OnlineView][Download 5243K] - ZHOU Jianguo;SONG Wanjun;BAI Long;ZHANG Guoqiang;LI Zhenyu;WANG lei;ZHANG Xin;ZHANG Yaojie;ZHANG Chuanxiang;LI Xiaolong;Shangyuquan coal mine of state energy group Guoshen company;Ordos institute of technology;Henan Polytechnic University Ordos Research Institute of Clean Coal Development and Utilization;Science and Technology Talent Bureau of Ordos High Tech Industrial Development Zone;
With the continuous exploitation and utilization of coal resources in mines, the quality of coal is gradually reduced, and the production performance of the original process is reduced. In order to explore the best production plan, the raw coal in the mine was selected for screening float and sink experiment, and the process performance of the main washing equipment heavy medium cyclone, relaxation sieve and TDS intelligent dry separator was tested. It was found that the quantity efficiency of heavy medium cyclone reached 97.49% respectively, and the total mismatch content of the screen surface under the relaxation sieve was M_O=8.2%. The coal carrying rate of gangue, the coal carrying rate of gangue in the TDS separator is 5.26%, the coal carrying rate of gangue in the coal is 16.92%, the discharge rate of gangue is 77.69%, and the total mismatch content is 11.90%. According to the test results, the problems existing in the washing equipment are analyzed and suggestions are put forward. The original coal exhibits a uniformly distributed particle size with a moderate ash content, higher gangue content, and frequently presents a mud phenomenon. The ash content of the clean coal should be kept within 30%. During the operation of the heavy medium cyclone separator, it is crucial to maintain control over the suspension density of the medium in the cyclone and the medium density and level in the medium barrel. The lower sieve surface of the vibrating screen shows acceptable separation efficiency, but there is a higher content of difficult-to-screen particles nearby, necessitating further enhancement in production management and operational proficiency. Additionally, it is essential to regulate the content of fine particles and incoming moisture, aiming to minimize the generation of fine-grade materials and agglomerates. The reject rate of gangue in the TDS separator significantly exceeds the standard value, necessitating improved daily maintenance, timely inspection of the array and foreign materials on the material line, strict control over incoming moisture, and the establishment of a comprehensive dust filtration and treatment system to enhance the separation efficiency of the TDS separator.
2024 S1 v.30 [Abstract][OnlineView][Download 6243K] - WANG Chengcai;Shendong coal group National Energy Group General Dispatch Office;
Coal Gangue is a kind of solid waste discharged from coal mining and washing. The current stock of coal gangue in China has reached 4.2 billion tons. The treatment of coal gangue by waste will not only pollute the environment seriously, but also occupy a lot of land. Therefore, this paper will take Shendong area as an example to explore the status of coal gangue in Shendong area and the way of resource utilization.
2024 S1 v.30 [Abstract][OnlineView][Download 1706K] - WEI Zhongkuan;XU Huilin;SHI Yingxiang;CHENG Huichao;LIU Peikun;JIANG Lanyue;China Coal (Tianjin) Underground Engineering Intelligent Research Institute Co.,Ltd.;China Coal (Tianjin) Mining Technology Co.,Ltd.;College of Mechanical and Electronic Engineering,Shandong University of Science and Technology;
The second stage cyclone of the conventional three product cyclone can only be passively controlled by the residual pressure of the first stage cyclone, and cannot achieve active and online adjustment. To address this issue, a new medium supply port has been added to the two-stage cyclone to improve the separation flow field by adjusting the parameters of the two-stage medium supply. Through numerical simulation, the influence of flow rate and density parameters of two-stage medium on the sorting flow field was studied. It was found that two-stage medium can provide higher pressure gradient and tangential velocity, improving the sorting accuracy of the three product cyclone; Adjusting the parameters of the second stage medium supply according to the demand can effectively reduce the phenomenon of "middling coal dirt band" and "gangue with coal"; The formula for fitting the flow rate and density of the two-stage medium to the outlet density of the three-product cyclone has certain guiding significance for production practice.
2024 S1 v.30 [Abstract][OnlineView][Download 10820K] - BAI Long;SONG Wanjun;LIU Qi;State Energy Group Guoshen Company Shangyuquan Coal Mine;
In response to the problems of no vehicle type detection, relying on manual operation in the railway loading system of Shangyuquan Coal Mine, which is prone to human errors, low efficiency, and unstable quality, as well as the lack of an intelligent control platform, non traceable historical data, independent loading automation system, anti freeze spray control and other process links, the inability to achieve linkage control between systems, the lack of loading quality detection system, and the tendency to overload and unbalanced load, an intelligent loading control system, intelligent loading management platform, intelligent video recognition system, and intelligent unbalanced load detection system are designed as the main body of the intelligent loading control system. Through functional modules such as carriage information recognition, carriage status detection, loading quality detection, and automatic coal replenishment, the entire carriage information recognition, carriage status detection, loading quality detection, and automatic coal replenishment are achieved. Automatic intelligent loading improves loading efficiency, safety level, loading quality, management efficiency, promotes intelligent development, and enhances the competitiveness of enterprises.
2024 S1 v.30 [Abstract][OnlineView][Download 3235K] - MA Zhihong;ZHANG Yangxin;LI Peishi;XU Xianyi;CAI Jin;HUANG Zhong;Shenhua Zhungeer Energy Co.,Ltd.;Shanxi Research Institute for Clean Energy Tsinghua University;Department of Energy and Power Engineering,Tsinghua University;
In order to promote the construction of a new energy system, the clean and efficient utilization of coal is still the focus of China′s energy strategy. As one of the important directions of clean and efficient utilization of coal, coal water slurry technology has many advantages. The experimental study on the atomization combustion mode of ultra-fine coal water slurry was carried out, and four kinds of atomizing spray guns were verified. The change law of spray particle size at the outlet of the spray gun under different conditions was quantitatively analyzed. The results showed that the fluctuation range of atomizing particle size D_(50) was 61.7-119.3 μm and the range of D_(90) was 105.7-181.7 μm. Based on the results of atomization characteristics, the structural design of atomizing spray gun was optimized, and the experimental research was carried out on the combustion test bench. The actual combustion performance of different structural spray guns was compared from the aspects of combustion temperature, flame shape, flue gas state, etc., and the influence of different spray gun structures on fuel combustion performance was determined, which provided technical basis for subsequent engineering design and equipment selection. Relevant work has promoted the development of ultra-fine coal water slurry combustion technology.
2024 S1 v.30 [Abstract][OnlineView][Download 19731K] - BAI Liugui;WANG Bin;WANG Dapeng;CHN Energy Shendong Coal Preparation Center;CHN Energy Shendong Technology Research Institute;China University of Ming and Technology;
In order to further reduce the medium loss on the demediation screen in the coal preparation plant, a double-channel wide-angle demediation nozzle was designed on the basis of the single-hole nozzle. A research platform for the injection performance of the nozzle was built, the influence of the nozzle diameter, inclination angle and grooving angle on the impact force distribution and average value of the jet was studied, the optimization parameters of the two-channel wide-angle demediation nozzle were determined, and the industrial application test was carried out in a thermal coal preparation plant. The results show that the striking force of the horizontal section of the two-channel wide-angle disengagement nozzle is basically a normal distribution curve, and the average value basically increases first and then gradually decreases with the increase of the nozzle diameter, inclination angle and grooving angle, and the optimized structural parameters of the nozzle are 9 mm diameter, 30° nozzle inclination angle and 50° grooving angle. Compared with the on-site sprinkler, the content of magnetic matter on the screen is reduced by 35.71%, and the content of-2 mm in the refined coal on the screen is reduced by 37.71%.
2024 S1 v.30 [Abstract][OnlineView][Download 8210K] - LIU Liangping;ZHANG Kai;YANG Yansheng;GAO Yinghui;National Energy Shendong Coal Group Co.,Ltd;School of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing);College of Mining Engineering,Taiyuan University of Technology;
In this paper, the harmless landfill grouting technology of coal gangue in Shendong Bulianta is studied and applied in engineering, and its economic and social benefits are analyzed. The results show that landfilling coal gangue and layered grouting is an effective way to comprehensively control coal gangue. This process not only reduces the environmental problems caused by open-air stacking of coal gangue, but also has good economic and environmental benefits. It has reference significance for the resource treatment of coal gangue.
2024 S1 v.30 [Abstract][OnlineView][Download 29268K] - CHEN Xiuqi;BAI Yongqing;JIANG Siyuan;ZHANG Zhong;GE Chunjie;WANG Chuanzhen;Ordos Guoyuan Mining Development Co.,Ltd.;Tianjin Detong Electric Co.,Ltd.;School of Material Science and Engineering,Anhui University of Science and Technology;
Promoting the intelligent construction of coal preparation plant is an inevitable trend of scientific and technological progress and the development of The Times. The original coal preparation process of Longwanggou Coal preparation plant can't meet the needs of intelligent coal preparation plant, so the heavy medium system and concentration system of Longwanggou Coal preparation plant are intelligently reformed. The detection accuracy of isotope on-line ash separator of the primary heavy medium system cannot meet the requirements of guiding production. Due to the lack of magnetic content detector, the magnetic content of qualified medium suspension cannot be effectively controlled, and the density of heavy medium suspension is prone to instability in the production process. There are no specific rules and regulations for flocculant and coagulant dosing in the original thickening system. The multi-parameter intelligent control of suspension of heavy medium system is carried out by fuzzy control of density content, liquid level and slime content. The density optimization of heavy medium suspension is controlled by fuzzy algorithm. The concentration system is reformed from three aspects: intelligent prediction of flocculant addition amount, intelligent control of flocculant addition amount and intelligent control of flocculant dosing process. After the intelligent transformation of Longwanggou Coal preparation Plant, the ash content of the heavy medium system is reduced by 0.88%, the heavy liquid usage is reduced by 0.03 kg/t, and the flocculant usage in the concentration system is reduced by 2.53 g/t. It lays a foundation for Longwanggou to build a model type intelligent coal preparation plant.
2024 S1 v.30 [Abstract][OnlineView][Download 15445K] - YANG Juanli;REN Leiping;LIU Zhiming;ZHANG Zejiang;ZHAO Gelan;China Coal Technology Group Information Technology Co.,Ltd.;
In order to maximize the overall benefits of coal preparation plant clusters in the coal group, leverage the overall advantages of each coal preparation plant, and solve the problem of using the principle of absolute advantage to divide labor among production units and seek local optimal benefits, a production optimization model based on the principle of comparative advantage is proposed. The model mainly adopts the principle of comparative advantage in economics to analyze the process coal yield, product coal yield, commodity coal cost, and economic benefits of coal preparation plant cluster units. Based on market(or customer) demand, combined with the nature of long-term coal and market coal orders, production units and division of labor are accurately and efficiently selected to ensure that the production efficiency of coal preparation plant cluster units and each coal preparation plant is globally optimal. The average efficiency per ton has increased from 399.85 yuan to 403.80 yuan, improving market competitiveness.
2024 S1 v.30 [Abstract][OnlineView][Download 1720K] - WANG Jun;Shendong coal group National Energy Group General Dispatch office;
Through adjusting the structure parameters of the dense medium cyclone, the operation performance of the cyclone is optimized, so that it can adapt to the current coal quality conditions in the coal-to-oil coal preparation plant. After the successful implementation of the project, not only the production index is optimized to ensure the quality of clean coal products, but also reduce the loss of clean coal, which has brought significant economic benefits to the coal preparation plant. In addition, this technology is also applicable to the coal loss problems in other coal preparation plants of Shendong washery center, and its research and development have provided technical support for the local formation of a dense medium cyclone washery equipment adapted to the characteristics of coal, the long-standing problems have been solved.
2024 S1 v.30 [Abstract][OnlineView][Download 8543K] - PAN Yuejun;HE Xiaofeng;Shendong coal group National Energy Group General Dispatch office;
BLAST furnace injection is an important technology to improve the utilization ratio of injected coal and reduce production cost in modern iron and steel industry. As a rich coal resource in China, Shendong bituminous coal has high calorific value and volatile matter, but its application effect and feasibility in blast furnace injection have not been fully studied. Based on the analysis of the characteristics of Shendong bituminous coal, this paper discusses the feasibility of its application in blast furnace injection, and carries out relevant experimental research, which provides a theoretical basis for the application of Shendong bituminous coal in blast furnace injection.
2024 S1 v.30 [Abstract][OnlineView][Download 5358K] - LI Jingjing;Shendong coal group National Energy Group General Dispatch office;
The dense medium shallow trough separator, as the key equipment of lump coal separation in Shendong washery, is widely used for its large-scale handling capacity, low energy consumption, small occupation area and high separation precision. This study focuses on the technical improvement of 305# shallow trough process system in Shangwan coal preparation plant, which is optimized and implemented after the initial implementation plan is not satisfactory. After three months of implementation, the results show that the frequency of upward flow clogging in shallow grooves has been reduced by more than 80%, the production cost per ton of coal has been effectively reduced, and the reliability of production organization has been improved, it ensures the stability of the product quality, and forms mature and reliable technical results, which can provide guidance for other units in the group to improve the anti-clogging optimization.
2024 S1 v.30 [Abstract][OnlineView][Download 11110K] - LIU Jun;Guoneng Shendong Coal Group Washing Center;
In the process of coal selection and heavy medium separation in coal-fired furnaces, there may be errors in the collected data such as coal slurry content and magnetic material content, which cannot accurately capture the key characteristics of coal. As a result, the heavy medium separation process cannot overcome unexpected disturbances, and control can only be completed in the form of feedback later, resulting in poor control effect. To this end, a convolutional neural network-based feedforward compensation based intelligent control technology for heavy medium sorting in coal-fired boilers of coal preparation plants is proposed. Real time collection of separation parameters such as coal slurry content, heavy medium density, and magnetic material content in the coal selection process medium through instruments. Using convolutional neural network models to identify and evaluate the water content ratio of coal slurry filter cakes, as a basis for intelligent control of heavy medium sorting; Design a feedforward compensation method based on historical data and coal slurry cake moisture content data. By compensating for the disturbance caused by the selection of clean coal ash, a sorting model for clean coal ash is obtained, and reasonable sorting parameter values are estimated. The content parameters collected through the instrument will be used as feedforward input features, and the expected output values will be dynamically adjusted based on the real-time monitoring and estimation of sorting parameter values. The experimental results show that the proposed method has a good intelligent control effect on the coal selection and heavy medium separation process of the combustion furnace, with small fluctuations in the moisture content of the coal slurry, and can ensure the efficiency and quality of coal selection.
2024 S1 v.30 [Abstract][OnlineView][Download 6877K] - ZHANG Jiabin;CHN Energy Shendong Coal Preparation Center;
This study is dedicated to the transformation and implementation of the intelligent addition system for heavy media in the Halagou Coal Preparation Plant, in order to improve production efficiency and reduce operating costs.Through in-depth analysis of existing medium libraries and manual preparation systems, this study proposes a comprehensive renovation plan, including optimization of medium library structure, automated pipeline laying, pump station construction, and integration of concentrated medium barrels and magnetic separators. The automation and intelligence of medium supply have been achieved, significantly improving the accuracy and stability of medium addition. Actual operational data shows that after the implementation of the system, manual labor hours have been reduced by 50 hours per month, and the efficiency of replenishment has increased by 80%, effectively supporting the transformation of coal preparation plants towards automation and intelligence. The study also looks forward to future technological development, including algorithm optimization and intelligent upgrading, providing direction for the continuous progress of the industry.
2024 S1 v.30 [Abstract][OnlineView][Download 3988K] - ZHAO Yadong;MA Tengfei;HU Xiaogang;WU Yifan;Bulianta Coal Mine,Guoneng Shendong Coal Group Co.,Ltd.;China Coal Technology & Engineering Group Information Co.,Ltd.;
Aiming at the problem of low fault diagnosis accuracy caused by the difficulty of vibration signal extraction in the fault diagnosis of belt conveyor roller bearing, a fault diagnosis method of roller bearing based on one-dimensional convolutional neural network(1DCNN) and extreme learning machine(ELM) was proposed. Firstly, according to the specific fault diagnosis task, the collected data was divided and Fourier transform was performed. Then, 1DCNN was used to extract fault features, and ELM was used to classify faults according to the extracted fault features. The test accuracy reaches 100 %,and the test time is 2.82 s and 2.42 s, respectively. By comparing with ELM,random forest, K-nearest neighbor method, support vector machine and convolutional neural network, the superiority of the proposed method were demonstrated. The results show that the diagnosis method combining 1DCNN and ELM is better than the single method, which can meet the needs of roller fault diagnosis in coal mine field.
2024 S1 v.30 [Abstract][OnlineView][Download 17805K] - XU Huilin;SHI Yingxiang;LI Hongqi;JIANG Lanyue;GAO Hang;China Coal (Tianjin) Underground Engineering Intelligent Research Institute Co.,Ltd.;China Coal (Tianjin)Mining Technology Co.,Ltd.;College of Mechanical and Electronic Engineering,Shandong University of Science and Technology;
The suction capacity and ability to crush bubbles of a flotation machine are key indicators for evaluating its performance. A large number of fine bubbles can improve the selectivity of coal slurry and enhance the recovery rate of clean coal. A biased short blade impeller was proposed and designed for this purpose, which was applied in a self-priming mechanical agitation flotation machine for coal slurry flotation. Using the CFD-PBM numerical simulation method, compared with the conventional impeller flotation machine, research finds that compared to conventional impellers, short blade impellers effectively reduce the blockage caused by backflow vortices on the suction surface of the blades, increasing the effective flow channel of the impeller by 8.3 percentage points. Short blades enhance the cutting ability of bubbles, significantly increasing the number of medium and fine-grained bubbles, while keeping large-sized bubbles at a lower level. The suction capacity of the biased short blade impeller has increased by 26.79%,and the gas content and gas dispersion characteristics in the flotation cell have been notably improved. It can replace conventional impellers under the original working conditions, achieving efficient flotation.
2024 S1 v.30 [Abstract][OnlineView][Download 16246K] - LI Xiaoduan;GUO Qiang;TANG Jiawei;LIU Zhaofeng;JIANG Binbin;YAN Zuyu;LI Jingfeng;State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,National Institute of Low-Carbon-and-Clean Energy;Shenhua Group Xinjie Energy Co.,Ltd.;
Softening and hardness removal process is an important part of zero discharge treatment of high salinity mine water. With the change of mine water composition and salinity, the traditional double alkali hardness removal method generally has the problems of excessive dosage of reagents and poor hardness removal effect. In order to reveal the influence mechanism of removing hardness of high salinity mine water in complex composition system, this paper explored the influence of raw water and membrane concentration on salt type, salinity, hardness and so on by preparing simulated water. Two kinds of salt, SO_4-Na and Cl-Na, were designed, and the experiment was carried out with salinity gradient of 1 000-60 000 mg/L and calcium hardness(calculated as calcium carbonate) gradient of 500,1 000,2 000 mg/L.The results show that the increase of salinity has a significant negative effect on the removal of hardness, and the low salinity mine water with the concentration of 15 000 mg/L and below can refer to the control parameters of the dual-alkali process. The precipitation reaction rate of SO_4-Na type mine water is slower than that of Cl-Na type mine water, while the reaction time of the high salinity SO_4-Na mine water needs to be extended to 10-20 minutes compared with the traditional dual-alkali process. The increase of hardness has a positive effect on hardness removal, except for the high salinity sodium sulfate system. Under the influence of scale inhibitor, the destabilization method of hardness removal in the concentrated solution system was explored. Results show that Fe~(3+),calcium carbonate and calcium sulfate seed induction method can effectively improve the hardness removal effect of membrane concentrated solution. In this study, the influencing factors and optimal operation suggestions of different water quality chemical methods for hard removal in zero discharge process were established, which provided theoretical and technical support for zero discharge of mine water.
2024 S1 v.30 [Abstract][OnlineView][Download 9138K] - JING Jiangming;QIAO Guoqiang;ZHANG Baopeng;Shaanxi Xiaobaodang Mining Co.,Ltd.;
In the process of coal production, the stability and safety of the circuit system is crucial to the normal production of the enterprise and the life safety of workers. Traditional control methods for power supply systems often have certain safety hazards, such as circuit overloading, short-circuiting of equipment and other problems, which not only lead to economic losses, but may even endanger the lives of workers. In order to solve these problems, the embedded intelligent substation technology was adopted, which can realise the orderly control of the power supply system and improve the stability and safety of the circuit system. This study verified the feasibility and superiority of the power supply system based on the embedded intelligent substation by simulating and analysing the actual operation of the underground power supply system. By adopting this technology, enterprises can effectively reduce problems such as circuit overload and equipment short circuit, reduce economic losses and improve production efficiency. At the same time, the technology can also effectively protect the life safety of workers and reduce the occurrence of safety accidents. The promotion and application of this technology is of great significance to guarantee the normal and orderly production of coal.
2024 S1 v.30 [Abstract][OnlineView][Download 3526K] - QU Bo;LIU Jie;ZHANG Shiming;WU Yifan;Guoneng Shendong Coal Group Co.,Ltd.;Middling coal Science and Engineering Group Information Technology Co.,Ltd.;
This paper addressed the issues of poor water quality, high hardness, excessive impurities, and elevated levels of acid, base, and salt ions in underground coal mines. Focusing on the damage caused by these water quality problems to hydraulic system equipment, it introduced the structure, process, principles, functions, and key technologies of an intelligent water treatment and purification station for coal mines. The primary functions of this equipment were highlighted, encompassing three-stage filtration, automatic cleaning, automatic monitoring, automatic dosing, and remote monitoring. The key technologies involved in these functions are elaborated upon: three-stage filtration utilizes three types of filter media to produce water with varying degrees of filtration precision, automatic cleaning achieves maintenance-free operation through the integration of three cleaning mechanisms, automatic dosing implements automatic drug injection via a hydraulic dosing device, remote monitoring enables online monitoring through a network of sensors, control hosts, and Ethernet connections. Upon deployment in an underground mine in Shendong, this equipment has demonstrated remarkable efficacy in removing acid, base, and salt ions from mine water. The pre-and post-treatment deionization results were significant. The system employs both differential pressure and time-based modes for intelligent, three-stage cleaning, facilitating practical applications in the promotion of automation technologies and remote monitoring for coal mine equipment. Real-time, automated data transmission from underground to surface monitoring systems has been achieved. While meeting the mine′s requirements for water quality and flow rate, this equipment realizes automatic monitoring and unattended operation, thereby reducing labor intensity, enhancing the management level and production efficiency of underground coal mine equipment. It merits further promotion and application.
2024 S1 v.30 [Abstract][OnlineView][Download 18218K] - YANG Jianning;ZHANG Zhijun;School of Chemistry and Environmental Engineering,China University of Mining and Technology-Beijing;
In order to solve the problems of difficult settling and high consumptions of flocculants for coal slime water in coal preparation plants, the particle size distribution and mineral composition of the coal slime water from Zaoquan Coal Preparation Plant in Ningxia were analyzed. Sedimentation tests were conducted using a new type of flocculant(TG),cationic polyacrylamide(CPAM),calcium chloride(CaCl_2),and polyaluminum chloride(PAC) respectively. The effect of combining two types of flocculants on the settling performance of the coal slime water was also studied. The results show that the coal slime water had a content of <0.045 mm of 74.88% and an ash content of 69.58%,and contain a large amount of clay minerals that are easy to mud, which makes the coal slime water difficult to settle. When a single type of flocculant is added, TG has the best effect, and with the increase of its dosage, the turbidity of the supernatant decreases continuously, the sedimentation layer height first decreases and then increases, and the initial settling velocity increases continuously. When two types of flocculants are combined, the combination of TG and CPAM have the best effect, and the optimal dosage is 60 g/t of TG and 20 g/t of CPAM,with an initial settling velocity of 50.00 cm/min, a sedimentation layer height of 2.30 cm, and a supernatant turbidity of 39 NTU.
2024 S1 v.30 [Abstract][OnlineView][Download 12081K] - ZHANG Bingxiang;National Energy Shendong Coal Group Washing Center;
Based on the compact layout and limited spatial location of old factory equipment, and the fact that electric chain hoists are generally composed of operating handles and control lines, power lines and control handles are easily damaged during long-distance transportation. Once faults such as chain breakage, hook head falling, and host loss of control occur, personnel have no safe escape space, causing personal injury and other problems. Based on the concept of "no one is safe, safe and efficient",intelligent transformation was carried out. Specific transformation measures were proposed for the current problems, and the innovation points and transformation effects were analyzed. Transforming the traditional operating handle into remote control, while adding comprehensive protection for micro motors, to achieve safe and convenient operation of the electric chain hoist, preventing unsafe behaviors such as overweight, tilting, and pulling, and achieving safe and efficient operation.
2024 S1 v.30 [Abstract][OnlineView][Download 8997K] - FAN Fengsheng;MA Yali;Halwusu Open-pit Coal Mine,China Shenhua Energy CO.,Ltd.;
Taking the slime of Heidaigou Coal Preparation Plant as the research object, the single factor test method was used to explore the effects of shear strength, shear time, coal slurry concentration, additive dosage, additive type and temperature on the rheological properties and stability of high concentration coal slurry. The preparation conditions of high concentration coal slurry which can meet the requirements of medium and long distance pipeline transportation were obtained. The results show that the best preparation conditions of high concentration coal slurry which meet the requirements of medium and long distance pipeline transportation are as follows: shear time 15 min, shear strength 2 500 r/min, additive dosage 0.5%,slurry weight concentration 64%-65%. The apparent viscosity of the slurry prepared under the optimum conditions is 492 mPa·s, which can still maintain good fluidity after settling for 15 days. The kinds of additives have obvious influence on the improvement of the rheological properties of coal slurry, and the coal water slurry additives provided by Heidaigou coal slime and quasi-energy gangue power company can achieve the best viscosity reduction effect, which is higher than 700 and 200 mPa·s respectively compared with lignin sulfonates and nano-series additives. The rheological properties and stability of high concentration coal slurry under the best preparation conditions and the selection of coal water slurry additive of Quasi-energy Gangue Power Company can fully meet the requirements of medium and long distance pipeline transportation.
2024 S1 v.30 [Abstract][OnlineView][Download 6333K] - GAO Zhanping;HU Xiaohua;HUO Yingao;HAN Zhenxing;XU Jixue;Guoneng Jinjie Energy Co.,Ltd.;National Energy Group New Energy Technology Research Institute Co.,Ltd.;School of Energy,Power and Mechanical Engineering,North China Electric Power University;
The expansion displacement characteristics of pipelines affect the safety of coal-fired units. Based on online monitoring data, the displacement changes of pipeline hangers for a certain ultra supercritical unit were analyzed and evaluated, and a stability evaluation function was constructed to evaluate the displacement of pipeline hangers at different operating stages. The results indicate that the displacement of the pipeline hanger during cold shutdown is maintained around the cold design value. During hot operation, the displacement fluctuates around the hot design value. During the startup process of the unit, the displacement of the hanger quickly reaches the hot design value. The expansion displacement of the hanger in the pre grid connection sub stage is greater than that in the post grid connection sub stage. The displacement changes of the suspension during the shutdown process are concentrated in the cooling sub stage. During the hot operation stage, the displacement stability of the hot reheat steam pipeline hanger is the best, while the displacement fluctuation of the cold reheat steam pipeline hanger is the largest. The stability score is 21.8% lower than that of the hot reheat pipeline hanger. The stability of the displacement changes of each pipeline hanger during the unit startup process is basically the same. The displacement change of the cold reheat steam pipeline hanger during the shutdown process is the most stable, while the displacement change of the main steam pipeline hanger is relatively severe, with a stability score of 17.2% lower than that of the cold reheat steam pipeline hanger. The constructed evaluation function can accurately describe the expansion displacement characteristics of pipeline hangers, providing data support for unit safety.
2024 S1 v.30 [Abstract][OnlineView][Download 12526K] - TIAN Buling;LI Zhiguang;CHEN Yang;Gansu Coal Geological Exploration Institute;School of Chemical and Environmental Engineering,China University of Mining and Technology-Beijing;International Mining Research Center,China Geological Survey;China Mining News;
Proximate analysis and ultimate analysis were carried out on a coal sample from a minable coal seam in Zhangye, Gansu Province. The grindability index, bonding index, caloric value, ash melting point, and so on were measured. The washability curve was drawn through sieve analysis and float and sink tests to realize the analysis and evaluation of the coal quality characteristics and washability. The results show that the coal samples of this coal seam belong to low-metamorphic, medium ash, high volatile and low fixed carbon coal without bonding property. When the ash content of cleaned coal is set to 10%,the theoretical separation density of the coal sample is 1.48 g/cm~3,which indicates the coal is difficult to separate. The coal in this region is a good feedstock for thermal power plant, and it can be used as the raw material for coal gasification. However, it can not be used as the raw material for coal liquefaction alone.
2024 S1 v.30 [Abstract][OnlineView][Download 2328K] - SHI Shuai;WANG Jifeng;CHN Energy Shendong Coal Preparation Center;Ordos City Inspection and Testing Center;
This article used a small cone angle hydrocyclone to purify coal gangue from the supplementary tower, and uses 3-mercaptopropyltriethoxysilane to organically modify the purified product. The modification mechanism of coal gangue was analyzed and studied using X-ray diffraction(XRD),chemical element analyzer(XRF),infrared analyzer(FT-IR),scanning electron microscopy(SEM) and other methods. The results show that the silicon aluminum molar ratios of coal gangue before and after purification are 2.88 and 2.18,respectively, indicating a significant purification effect. FT-IR,XRD,and SEM analysis show that the combination of the two is successful. The modified coal series kaolin and 3-mercaptopropyltriethoxysilane do not enter the interlayer through mineral surface interaction. 3-mercaptopropyltriethoxysilane is grafted onto the outer surface of coal gangue through monodentate condensation. The thiolated coal gangue obtained in this study can provide theoretical support for its application as a heavy metal wastewater adsorption material, reducing environmental pollution caused by coal gangue emissions.
2024 S1 v.30 [Abstract][OnlineView][Download 13122K] - GAO Wenge;Mechanical Maintenance Department,Shendong Coal Washing Center,National Energy Group;
The vibrator is the power source of the vibrating screen and the core component of the vibrating screen in the coal preparation plant. Due to different degrees of damage in the equipment under the complex and changeable material processing conditions, among the damage failures, bearing damage and seal oil leakage are the most common. The Schenck vibrator has a better performance in the vibrating equipment of the coal preparation plant. However, after a failure, due to the lack of a dedicated after-sales and maintenance base and the unsmooth channels, the normal operation of the equipment is affected. In this paper, a dedicated processing and manufacturing mechanism has been designed and processed for the felt seals of various models used in the Schenck vibrating screen, achieving the goal of independent processing of imported equipment spare parts. Judging from the actual use effect, it can be comparable to the original imported spare parts, and the service life is more than 8 months, realizing the original intention of independent design.
2024 S1 v.30 [Abstract][OnlineView][Download 4834K] - DIN Weibo;WANG Danying;CHENG Lei;RUAN Zeyu;HE Jun;WANG Shi;Shaanxi Coal Industry Company Limited of Caojiatan;China Coal Land Ecological Environment Technology Co.,Ltd.;College of Resources and Environmental Engineering,Jiangxi University of Technology;
There are frequent accidents of filling pipeline blockage in mines, and the spatial distribution characteristics of coarse tailings are the decisive factors. In addition, in the process of tailings thickening, most of the anionic polyacrylamide(APAM) was combined with the tailings particles and remains in the thickened tailings mortar, forming a floc net structure with enhanced structural performance, which changed the internal structure of the filling slurry. Combined with the tailings of a copper mine, the tailings slurry with and without APAM was prepared. The self-made multi-layer slurry sampling device was used to count the particle distribution in different settling time and settling area. The information of pore structure and moisture composition of tailings slurry in different layers was obtained by NMR testing technology. The surface microstructure of slurry in each layer was observed by SEM Finally, the vertical distribution characteristics of coarse tailings after APAM enhanced floc net structure were explored to reveal the macro flow mechanism of whole tailings slurry. The results show that: after adding APAM,the fine particles and coarse particles are closely connected through the floc net structure, and the pores between particles are reduced, the free water migrates to more stable adsorption water and pore water, which makes the porosity of slurry in each layer more uniform, the difference of coarse particle content in each layer decreases at the same settling time(the difference of coarse particle content in upper, middle and lower layers is not significant in 10 min and 40 min),and increases with the settling time With the increase of time, the content of coarse particles is no longer proportional to the settlement height. On the contrary, the content of coarse particles in the middle layer is greater than that in the lower layer, especially in 40 min(the content of coarse particles in the middle and lower layers are 51.78% and 50.23% respectively). The strengthened floc net structure formed by bridging action is more likely to interfere with the settlement of coarse tailings and make its vertical distribution more uniform. This study provides a theoretical basis for preventing the filling pipeline from blocking.
2024 S1 v.30 [Abstract][OnlineView][Download 59839K] - PANG Wei;National Energy Group Xinjiang Energy Limited Liability Company;
In the coal processing and flotation process, the presence of ultrafine coal particles has always been a critical factor affecting the recovery efficiency of coarse coal particles. Due to their small size and large specific surface area, these ultrafine particles exhibit complex interactions with flotation reagents, significantly impacting the flotation effect. However, the current understanding of the adsorption characteristics of different ultrafine particles towards various flotation reagents is limited, which hinders further optimization of flotation technology. To thoroughly investigate the influence of ultrafine coal particles on the flotation process of coarse coal particles, this study selected three representative coal samples and conducted systematic flotation experiments. By comparing the changes in recovery rates of coarse coal particles(>74 um) after adding ultrafine coal particles with different ash contents, it is found that the recovery rate of coarse coal particles decreases significantly when low-ash ultrafine coal particles are added, while the impact is minimal when high-ash ultrafine coal particles are added. To elucidate the mechanism behind this phenomenon, the interaction between ultrafine coal particles and flotation reagents through measurements of contact angle and wetting heat were further studied. The experimental results indicate that low-ash ultrafine coal particles exhibit strong adsorption capacity for both collectors and frothers, likely due to their surface properties that facilitate interactions with flotation reagents. In contrast, high-ash ultrafine coal particles have a stronger adsorption capacity for collectors but a weaker adsorption capacity for frothers, suggesting that frothers may play a more crucial role in the recovery of coarse coal particles. This study not only reveals the mechanism of the influence of ultrafine coal particles on the flotation process of coarse coal particles, but also provides important theoretical and experimental guidance for the optimization of flotation technology.
2024 S1 v.30 [Abstract][OnlineView][Download 10515K] - LIU Dengke;CHEN Zonghe;Daichiba Coal Preparation Plant,Sichuan Chuanmei Huarong Energy Co.,Ltd.;
With the continuous improvement of coal mining mechanization and the reduction of high-quality coal resources, the proportion of coal slime in the raw coal is gradually increasing. Coal slime, as one of the main by-products of raw coal washing, is difficult to sell due to its high moisture and low calorific value using traditional filter presses. In order to reduce the moisture content of coal slime, increase the calorific value of coal slime, practice the practice of no coal slime, and improve the economic benefits, Daichiba Coal Preparation Plant conducted ultra-high pressure filtration experiments on the flotation tailings. The experimental results show that the average moisture content of the flotation tailings recovered by the ultra-high pressure filter is 13.1%,which is 12% lower than the moisture content of the existing filter cake. The dewatering experiment achievs the expected goal.
2024 S1 v.30 [Abstract][OnlineView][Download 1849K] - CHEN Zhongshu;ZHOU Yunhong;XIN Xueming;DENG Zhenping;Inner Mongolia Zhongyu Ted Coal Co.,Ltd.;School of Chemical Engineering and Technology,China University of Mining and Technology;
In order to solve the problem of recycling and utilization of coal bearing kaolinite resources, an automatic photoelectric separation system based on the combination of machine vision and photoelectric separation was proposed on the basis of traditional photoelectric separation technology. The structure and working principle of the photoelectric sorter, the definition of machine vision and thetarget detection algorithm based on YOLOv7 network were introduced. In order to solve the problems of poor recognition ability and poor adaptability of the photoelectric sorter, the camera recognition technology and the AL recognition algorithm based on YOLOv7 were implanted in the MS2000 sorter. Taking the coal gangue produced by the Suancigou Coal Preparation Plant in the Zhungeer area as the research object, the characteristics of the coal gangue were analyzed by X-ray fluorescence spectrometry(XRF) and X-ray diffraction(XRD) technology, and the necessity of coal measure kaolinite selection was analyzed. Selection tests were carried out using this system. Results show that the weighted average values of sorting precision and quantity efficiency are as high as 94.4%,and the weighted average value of mismatch content is as low as 6.69%,and the sorting system has a good sorting effect on coal bearing kaolinite.
2024 S1 v.30 [Abstract][OnlineView][Download 7621K] - ZHAO Guanghui;SHI Changyu;LI Zhijun;WANG Weinan;DUAN Chenlong;GuonengZhunneng Group Co.,Ltd.;China University of Mining and Technology;
As a key equipment for deep dry coal screening in coal preparation plants, the flip-flow screen, especially the crankshaft connecting rod type, has good stability and is widely used in large power coal preparation plants. The crankshaft connecting rod mechanism is the core and key component of the large flip-flow screen, and its reliability has a significant impact on the screening effect and subsequent sorting processes. Therefore, this study adopted finite element simulation calculation, focusing on the dynamic characteristics of the crankshaft connecting rod mechanism. Based on the LF301008 large-scale flip-flow screen, a finite element model of the crankshaft connecting rod structure was constructed and modal analysis was conducted. Then, the harmonic response analysis under simple harmonic load was carried out using the modal superposition method. Finally, the motion state of the screen machine was simulated through boundary conditions and dynamic analysis was conducted. The results indicate that their natural frequencies are higher than the excitation frequency during system operation, and there is no risk of resonance in the crankshaft connecting rod structure.The stress generates by the crankshaft connecting rod under working conditions is concentrated on the surface of the crankshaft and the bearings of the connecting rod, with a maximum strain of 1.10 × 10~(-4),which meet the design requirements. At the same time, it is determined that the mechanical collision between the connecting rod and the crankshaft is the main cause of material deformation in the structure. The results of this study provide a theoretical and technical reference for the selection, design, structural optimization and engineering practice of large-scale crankshaft connecting rod type flip-flow screens.
2024 S1 v.30 [Abstract][OnlineView][Download 8023K] - GONG Cheng;CHONG Xihu;XING Yue;PENG Peng;ZHOU Ti;China Power Hua Chuang Eelectricity Technology Research Co.,Ltd.;Anhui Huainan Pingwei Power Generation Co.,Ltd.;
As one of the important auxiliary machines of coal-fired power units, the dynamic axial flow fan has a high failure rate due to the increased resistance of the flue gas side system and the stall of the induced draft fan after ultra-low emission transformation, the production personnel cannot intuitively judge the position of the induced draft fan operating conditions in the performance curve, cannot intuitively grasp the working state of the fan, and the stall phenomenon cannot be warned in advance. At the same time, the three major fan plants have a high electricity consumption rate. Therefore, it is of great significance to realize the intelligent monitoring of induced draft fans and the energy-saving operation of feeding and directing fans under different working conditions. Experiments show that by establishing an operation monitoring model, the induced draft fan can be monitored in real time and stalled early warning, providing real-time pictures for operators to ensure the safe operation of the unit. By establishing an energy-saving operation model of the supply fan and induced draft fan, the optimal oxygen adjustment interval is provided for the operator, which can reduce the factory power consumption rate of the fan and improve the economy of the unit operation.
2024 S1 v.30 [Abstract][OnlineView][Download 8023K] - LIU Jie;SI Wangdou;WU Yifan;Bulianta Coal Mine,Guoneng Shendong Coal Group Co.,Ltd.;China Coal Technology & Engineering Group Information Co.,Ltd.;
The speed control of the coal mine excavation conveyor is the key to the operation of the conveyor. According to the change of working conditions, the speed of coal mine excavation conveyor needs to be converted to the corresponding working condition in time to ensure stable operation. Therefore, the speed adaptive PID control technology of coal mine excavation conveyor under variable working conditions is proposed. The energy consumption model and system model of coal mine cleaning conveyor are established, and the correlation between transportation volume and belt speed is obtained by correlation analysis method. Based on the PID controller, an expert PID controller is designed, which takes the minimum energy consumption as the control target, and combines the relationship between the transportation volume and the belt speed to carry out the adaptive control of the speed of the coal mine cleaning conveyor. In the control process, the smoothness of the output signal of the PID controller is improved through the RC filter to avoid the vibration phenomenon in the control process, and the adaptive control of the speed of the coal mine cleaning conveyor is completed. The results show that the energy consumption rate of the proposed method is below 0.24 W/kg when tested under different operating conditions: The speed control curve is basically consistent with the set speed curve, and the control erroris less than 5 m/s: The angular velocity curve is relatively stable; The response stability obtained under different operating conditions is above 98%. This indicates that the proposed method has strong practicality.
2024 S1 v.30 [Abstract][OnlineView][Download 7593K] - MA Tengfei;LIU Ning;WU Yifan;Bulianta Coal Mine,Guoneng Shendong Coal Group Co.,Ltd.;China Coal Technology & Engineering Group Information Co.,Ltd.;
The detection of the development height of the water-conducting fracture zone in the mining overburden and the relevant theoretical research are of great significance for scientific guidance of the statistics of water inflow in the coal mine, the prevention and control of water hazards in the working face and the water-conservation mining.The research takes the 12511 working face of Bulianta Coal Mine in Shendong Mining Area as the geological prototype, and uses the combination of physical similarity simulation test and field borehole flushing fluid leakage observation method to obtain the height of fractured zone caused by the mining of the working face. The results show that the average periodic weighting step of the working face is 15 m, the initial weighting step is 50.6 m, the variation range of rock fracture angle is 32～60 °, the average is 51 °, and the basic roof movement mode is mainly delamination, bending, fracture, rotation and collapse; When the working face is advanced to 100m, the maximum fracture density at the place where the initial weighting occurs reaches 20 pieces/m. When the working face is advanced to 200 m, the fractured rock mass in this range is gradually compacted, the fracture development density is reduced to 16 pieces/m. The final development height of the caving zone is 35.7 m, and the fractured zone is 118 m; According to the leakage amount of drilling flushing fluid on site and the color TV observation of drilling holes, the fractured zone height is 93.12 m, 16.63 times the mining height, and the height of the collapse zone is 36.52 m. The results of the physical similarity model test based on the development characteristics of the water conducting fracture are reasonable and can be used as a reliable method for the study of the development height.
2024 S1 v.30 [Abstract][OnlineView][Download 15413K] - HU Haiyang;FENG Yunfei;CHEN Jie;GAO Wei;LI Quanzhong;DU Zhigang;Guizhou Research Center of Shale Gas and CBM Engineering Technology;Geological Exploration Research Institute,Guizhou Bureau of Coal Geological Exploration;Mining Engineering Department,Shanxi Institute of Technology;Civil Engineering Department,Luoyang Institute of Science and Technology;
In view of the few development cases of coalbed methane horizontal wells in Guizhou Province, the adaptation research and application effect evaluation of coalbed methane horizontal wells drainage gas recovery process are carried out. Taking horizontal well in Liupanshui coalfield as an example, the influence of well inclination and fracturing scale on gas drainage and production equipment is analyzed, and equipment adaptability is analyzed, and jet pump is selected as the drainage and production equipment of this well. The practice shows that the complex working conditions of coalbed methane horizontal wells will affect the adaptability of the drainage equipment, and the matching drainage equipment should be selected according to the complexity of the working conditions of the horizontal wells. The use of jet pump for drainage and production of coalbed methane horizontal Wells can meet the requirements of continuous and stable drainage of horizontal wells. By optimizing the downhole pipe string and pump depth of jet pump, enlarging sand and powder sinking well section, adopting "S" type output flow channel to separate gas and water fluid, the phenomenon of pump barrel sticking and gas lock can be effectively avoided. The development practice and application results of this horizontal well provide engineering reference for the optimization of drainage and gas production equipment and string optimization of coalbed methane horizontal wells in Guizhou Province.
2024 S1 v.30 [Abstract][OnlineView][Download 5190K] - NI Gang;Shendong coal group National Energy Group General Dispatch office;
With the development of high-quality economy, it is an inevitable trend for coal enterprises to change the mode of production management in order to adapt to the market changes and industry development needs. At the same time, the development of modern technology makes the internal production of coal enterprises more advanced technology, a variety of high efficiency, intelligent equipment has been widely used, in this context, to achieve intelligent production operation management, the adjustment and optimization of production management system is the focus of attention. Taking Shendong coal group as an example, this paper probes into the application practice of customized precision production management system in coal enterprises, starting with the most intuitive economic benefits, the value and feasibility of this intelligent production management method are clearly demonstrated through the economic benefit numerical value, and the economic benefit gap is systematically analyzed by comparing with the traditional production management mode, the feasible path to achieve the goal of resource optimal allocation and cost reduction and efficiency increase can provide reference for coal enterprises to realize intelligent production management and control and gain maximum benefit.
2024 S1 v.30 [Abstract][OnlineView][Download 2935K] - NI Gang;Shendong coal group National Energy Group General Dispatch office;
With the positive promotion of the "double carbon" target, and the concept of environmental protection, energy conservation and green development becoming more popular, the development of coal enterprises is facing more challenges. In the process of enterprise development, coal resources are the main business items. As non-renewable energy and non-clean energy, coal resources are in contradiction with the development trend of the new era, which makes coal enterprises face severe pressure. In order to break the predicament, it is urgent to promote internal reform and propose innovative development path. Among them, it has a positive effect on coal enterprises to build an "intelligent + standardized" coal quality management mode, use modern technology to expand the utilization of coal, and take low carbonization as the development direction. This paper takes the internal situation of Shendong Coal Branch of China Shenhua Energy Co., Ltd. as an example, combined with the shortcomings of the coal quality management of the enterprise, proposes solutions and countermeasures, and constructs the "intelligent + standardized" management mode, hoping to provide more reference for the sustainable development of the enterprise.
2024 S1 v.30 [Abstract][OnlineView][Download 3288K] - WANG Chengcai;Shendong coal group National Energy Group General Dispatch office;
In the“Double carbon” environment, in order to deal with the Shendong Company thin coal seam increasing year by year, the quality of raw coal continues to decline, coal quality management increasing difficulties of coal quality management predicament, the coal distribution center has been exploring and studying the present situation of Shendong coal quality management for a long time, and has gradually perfected and formed a set of effective coal quality management mode based on market price-oriented system matching. Operation Closed-loop, reward and punishment mechanism, through the design of a set of three levels of different trading entities linked to market prices, fully reflect the role of coal quality in the main content of the trading, fully applied the advantages of Shendong coal quality technology and management, it effectively arouses the enthusiasm of coal quality management of staff at all levels. The range of quality improvement of commercial coal is increasing compared with that of raw coal.
2024 S1 v.30 [Abstract][OnlineView][Download 4686K] - LI Hailong;Shendong coal group National Energy Group General Dispatch office;
With the support of the sustainable development of new-generation information and digital technologies, the requirements of high-quality development, high-efficiency development, promoting the concept of energy conservation and environmental protection, and building a strong country with high quality have been further implemented, under the background of new requirements, coal enterprises are also facing new challenges. In order to meet the demand of building a quality power, coal resources play an irreplaceable role, how to promote the quality of products in the process of technology upgrading, and how to achieve innovation and quality promotion become the key task, and the coal enterprise in the development of production management is an important link, therefore, in the context of the new era, actively explore the mode of production organization and management reform is an inevitable path. This article takes the State Energy Shendong Coal Group Co., Ltd. as an example to analyze the situation before and after the transformation of the production organization management model, and summarizes some experiences with popularization value, hope to provide more reference for coal enterprises to realize the innovation of production organization and management mode.
2024 S1 v.30 [Abstract][OnlineView][Download 2360K] - WANG Jun;Shendong coal group National Energy Group General Dispatch office;
With the continuous evolution of global energy market and the profound adjustment of China′s energy consumption structure, national energy groups are facing unprecedented opportunities and challenges in the new era. Taking the national energy group as an example, this paper expounds the development mode of integrated operation. The integrated operation is the unique operation mode of the National Energy Group and the core competitiveness of the group′s development. This paper expounds the characteristics and advantages of integrated operation of national energy groups, and then analyzes the challenges faced by the development of integrated operation in the new era, and puts forward some measures and suggestions.
2024 S1 v.30 [Abstract][OnlineView][Download 4806K] - PAN Yuejun;HE Xiaofeng;Shendong coal group National Energy Group General Dispatch office;
Energy, as the foundation and driving force of national economy, although the distribution of energy in China is becoming more and more optimized and the primary position of coal has been weakened, it still holds more than half of the share of energy consumption. Since 2017, China′s primary energy production and raw coal output have shown a steady recovery trend, and maintained a remarkable growth momentum, which clearly reveals that coal in the current national production activities indispensable. In the face of the 2021 Global Energy Crunch, China is keenly aware that the coal-dominated energy mix will not change easily in the short term and that the energy transition will no longer be solely about decarbonisation, it focuses on improving the green efficiency of coal and the level of intelligent technology, which is the key path to promote progress in the energy sector. Based on this, this paper mainly takes a coal preparation plant as an example, aiming at the intelligent coal preparation plant construction ideas and practical application to carry out the related discussion and analysis.
2024 S1 v.30 [Abstract][OnlineView][Download 3759K] - WANG Qiang;Shendong coal group National Energy Group General Dispatch office;
During the application of the equipment, coal group, based on its characteristics, can not avoid increasing the potential safety hazards. This study a Shendong coal group as an example, combined with the actual situation, summed up the existing emergency rescue equipment. From the status quo and the main content of the two aspects of analysis. This paper mainly expounds the construction of emergency rescue equipment for flood accidents, emergency rescue equipment for fire accidents, rescue equipment and technical construction for roof fall accidents, fire-fighting technology and equipment construction for large coal bunker with liquid CO_2(liquid N_2), rapid construction technology construction of underground wireless gas monitoring network and construction of long-distance directional reinforcement technology for coal and rock in fully mechanized mining face. Through systematic discussion, we can know that the construction of emergency rescue equipment of Shendong coal group, as a well-known enterprise in our country′s coal industry, is not only related to the safety production of the enterprise itself, also has the demonstration and the leading function to the entire profession emergency rescue system. The article details the types and development status of the current main emergency rescue equipment. Combined with the development trend of emergency rescue equipment in coal industry at home and abroad in recent years, the equipment level of Shendong Group is comprehensively evaluated. By summarizing the construction of the emergency rescue equipment in coal group, it can provide reference for the optimization of the emergency rescue system and the perfection of the equipment in the same type of enterprises.
2024 S1 v.30 [Abstract][OnlineView][Download 1751K] - LIU Jun;Guoneng Shendong Coal Group Co.,Ltd;
This article focuses on the practice of improving the quality and efficiency of large-scale thermal coal preparation plants, mainly focusing on two aspects: improving the quality of commercial coal and increasing the variety of coal. In terms of improving the quality of commercial coal, significant improvements in coal quality have been achieved by optimizing and transforming the coal system′s washing bottleneck, improving the washing and grading effects, and switching to washing low-quality coal. In terms of increasing the variety of coal, measures such as transforming and optimizing the clean coal increment of 2-2 coal blocks, improving bottleneck equipment capacity, and maximizing the production of ultra-low ash coal have effectively improved the efficiency and output of coal production. This article summarizes the achievements and experiences achieved in the practice of improving quality and efficiency, providing useful reference and inspiration for the operation of large thermal coal preparation plants.
2024 S1 v.30 [Abstract][OnlineView][Download 8721K] - WANG Youshuan;SHANG Guoyin;Shendong Supervision Co.,Ltd;General Dispatch Office of National Energy Shendong Coal Group Co.;
In view of the problems existing in the current team construction of coal mining enterprises, such as low participation of team members, weak sense of belonging, lack of lasting stability and scalability, and in line with the purpose of stimulating the vitality of the team and improving the enthusiasm of employees, this paper systematically puts forward the following ideas: safety culture, practical culture, standard culture, benchmark culture, learning culture, innovation culture, professional culture, cooperation culture, dedication culture Nanny culture as the content of the team culture system and promote practice. At the same time of the hard management of the team system, more cultural soft management elements are injected, aiming to continuously improve the participation, sense of achievement, sense of belonging and happiness of the team staff by comprehensively creating a good team cultural atmosphere, and change passive management into active management, so as to comprehensively improve the comprehensive strength and management level of the team, so as to ensure the efficient promotion and healthy development of all work of the enterprise.
2024 S1 v.30 [Abstract][OnlineView][Download 2663K] - SONG Libing;WANG Yingwei;SHANG Guoyin;Emergency and Fire Brigade of Guoneng Shendong Coal Group Co.,Ltd;Beijing Silin Technology Co.,Ltd;Emergency Management Office of Guoneng Shendong Coal Group Co.,Ltd;
At present, to promote the modernization of emergency management system and capacity has become our country′s policy requirements and the needs of the times. The high-speed development of coal industry has not changed the high-risk attribute of coal mine, and the level of emergency management of major coal mine enterprises is uneven. On the basis of analyzing the present situation and existing problems of the construction of emergency rescue team in large coal mine enterprises, this paper puts forward some measures and suggestions in terms of seeking policy support, improving the level of scientific and technological rescue equipment, establishing and perfecting the mechanism of admission and withdrawal of rescue personnel, strengthening training and drilling, paying attention to the construction of working style, and strengthening the guarantee of emergency resources.
2024 S1 v.30 [Abstract][OnlineView][Download 7811K] - YAO Yong;Shendong coal group National Energy Group General Dispatch office;
The intelligent development of coal industry has not changed the high-risk attribute of coal mine, so large-scale coal mine enterprises should strengthen emergency management. This paper introduces the experience and practice of emergency management in Shendong Coal Group, and analyzes the problems of emergency management system, mechanism and resource guarantee in large coal mining enterprises, and proposed the solution opinion and the measure, aims at provides more beneficial reference for the related profession safety management work optimization.
2024 S1 v.30 [Abstract][OnlineView][Download 1786K] - WANG Qiang;Shendong coal group National Energy Group General Dispatch office;
It is very important for the coal preparation enterprise to manage and manage the operation. It plays a role in coordinating the work of every department and link in the operation of coal preparation. Therefore, the coal mine production and operation must strengthen the management of operation and scheduling to enhance the level of management. This paper mainly introduces the present situation and problems of the“Double innovation” work carried out by the washing and separation center of Shendong Coal Group, the paper also puts forward the strategy of“Double innovation” to enhance the ability of operation and dispatching management, which provides reference for coal preparation enterprises to strengthen dispatching management.
2024 S1 v.30 [Abstract][OnlineView][Download 1786K] - WANG Youshuan;SHANG Guoyin;Shendong Supervision Co.,Ltd;General Dispatch Office of National Energy Shendong Coal Group Co.;
The control ability of district team leader is the comprehensive embodiment of leadership, decision-making, judgment and control ability under normal and abnormal circumstances in the management process. The level of team leader′s control directly determines the direction and effect of team construction, and also directly affects the efficiency of production and management. The paper studies and summarizes the contents of team leader′s control in large coal mine enterprise area, which can be used for reference for industry grass-roots management and personnel selection.
2024 S1 v.30 [Abstract][OnlineView][Download 1819K]
2024 S1 v.30 [Abstract][OnlineView][Download 90K]