- WANG Qiang;XU Xiangyang;School of Management,China University of Mining and Technology-Beijing;
Different from petrochemical industry, modern coal chemical industry takes coal as raw material and mostly develops downstream products through syngas. It is different from petrochemical industry in product structure and product direction suitable for development, but there is insufficient research on how to develop high-end modern coal chemical industry. By analyzing the data of 49 bulk chemicals, 63 new chemical materials and 52 fine chemicals, a set of index system for judging high-end chemicals was summarized, and the direction of high-end products of coal to olefins, coal to oil and coal to oxygenates, and focuses on the market and technical availability of five categories of products was put forward. The technical research directions in these five directions in the future were considered, which provided support for the high-end development of modern coal chemical industry.
2021 S2 v.27 [Abstract][OnlineView][Download 150K] - LIU Congyun;ZHAO Shuai;GAI Qingqing;SHENG Ying;LI Yonglong;Analysis and Characterizations Center,National Institute of Clean-and-Low-Carbon Energy;
An analytical method based on GC-MS with ultrasonic-assisted extraction has been developed for the determination of 18 Polycyclic Aromatic Hydrocarbons(PAHs)in coal liquefaction. The extraction conditions such as type and volume of extraction solvent, power and time of ultrasonic were optimized by using the central composite experimental design. The optimum experimental conditions were as follows: the extraction solvent was CH_2Cl_2 with volume of 30 mL,and ultrasonic power was 80% and ultrasonic time was 2 min. The results showed that the linear range of 18 PAHs was 0.2-20.0 mg/kg with correlation coefficients all more than 0.99,the lowest limits of detection was 0.2 mg/kg and the lowest quantitative limit was 0.6 mg/kg, and the repeatability RSD was less than 10%. The established method is simple and rapid, it improves the Soxhlet extraction method in the national standard method in which the total time is 16-24 hours and solvents usaqe is high at 250 mL. This method is accurate and reliable, and is suitable for the quantitative determination of PAHs. Qualitative analyisis by GC-MS with full scan mode of GC-MS was applied, and results showed that in addition to the 18 PAHs detected, there were also some hydrocarbons and substitutes of PAHs was found in the sample. This experimental method can be used for the analysis of PAHs in coal liquefaction, residue and also helpful for the separation and application of coal liquefaction residue.
2021 S2 v.27 [Abstract][OnlineView][Download 165K] - GU Congyang;XIN Shengwei;DUAN Shoubao;WANG Hu;XIE Guowei;DU Jiajun;WU Wanzhu;CHN Energy CFB Technology R&D Center;
The technical route of circulating fluidized bed(CFB)boilers to achieve ultra-low SO_2 emissions was introduced, and the technical characteristics of semi-dry desulfurization and limestone-gypsum wet desulfurization were compared; Taking a large-scale supercritical CFB as an example, two types were analyzed. The investment and operating cost of the technical route, the operating characteristics of the boiler using the two-stage SO_2 ultra-low emission system with in-furnace + tail semi-dry desulfurization and three typical loads were studied. The research results show that the large-scale CFB boiler adopts the SO_2 ultra-low emission technology of furnace desulfurization and semi-dry desulfurization, which can greatly reduce the investment and operating costs of the system. The sulfur content of the coal used in the boiler is 1.56%-1.67%. When the SO_2 concentration at the outlet of the boiler is controlled at 1 200 mg/m~3,that is, the desulfurization efficiency in the furnace is about 80%,the ultimate operating cost of ultra-low emissions is the lowest.
2021 S2 v.27 [Abstract][OnlineView][Download 260K] - XIN Shengwei;CHN Energy CFB Technology R&D Center;
The technical achievements of a company in the aspects of blending combustion of economic coal, collaborative removal of low-cost pollutants, wide-load denitrification and operation technology of supercritical CFB boilers were summarized, and certain economic and social benefits were achieved. In view of the typical common problems such as water wall wear, screen heating surface deformation, tubular-air-preheater leakage and NO_x emission control with low load in CFB boiler, targeted solutions were put forward and achieved good results. It provides technical support for the safety, environmental protection and economic operation of CFB boilers. Combining the advantages of CFB technology expounds the development direction of CFB technology under "carbon peak" and "carbon neutralization",that is develop large-capacity and high-parameter CFB boiler units to achieve "carbon emission reduction",and biomass burning helps "carbon neutralization" and deep peak adjustment to improve unit flexibility and play the role of "energy ballast stone".
2021 S2 v.27 [Abstract][OnlineView][Download 1034K] - WANG Ruibin;Coal Oil Preparation Plant,CHN Energy Guoneng Shendong Coal Group Coal Preparation Center;
Coal slime is characterized by low calorific value, high moisture content, high ash content and high viscosity, so it is difficult to use directly. At the same time, the technology of slime utilization is not advanced, so the coal preparation plant usually adopts the method of direct discharge, which is not only bad to environmental protection, but also wastes precious resources. In order to solve the problem of difficult utilization of coal slime, based on the characteristics of coal slime and the properties of fine particle table/interface, this paper analyzed the reasons for difficult utilization of coal slime, and expounded the current ways of utilization of coal slime by combustion, mainly for coal slurry direct combustion power generation, coal slurry water slurry and coal briquette and so on. Coal slime is a by-product of coal enterprises. Some backward areas will make it into briquettes, activated carbon, etc, or use gangue to make building materials, etc. Although some resources can be realized, for a large number of coal slime gangue, it′s not a comprehensive solution. In the future, the development space and potential of coal slime combustion are very large, and it is pointed out that increasing the added value of coal slime is one of the key ways to coal slime utilization.
2021 S2 v.27 [Abstract][OnlineView][Download 123K] - CHAI Jin;QIAO Jiafei;SUN Hao;LIANG Zhanwei;ZHANG Qian;CHN Energy New Energy Technology Research Institute Co.,Ltd.;
With the rapid development of artificial intelligence technology, the use of advanced algorithms to solve traditional environmental problems has become a new trend in electric power industry. The classical mechanisms of machine learning and deep learning neural network were summarized. The application and prospect of neural network algorithm in SO_2 emission prediction, pH prediction and comprehensive energy efficiency evaluation of FGD system were elaborated in detail. Research results show that LSTM deep neural network has outstanding advantages in dealing with non-linear regression problems, as well as temporality, large inertia and lag objects like FGD system. Finally, based on LSTM deep neural network algorithm and frequency conversion transformation of equipment, limestone gypsum wet intelligent FGD scheme for coal-fired power plant was proposed. The research has great significance to realize energy saving and consumption reduction of FGD system, which are conducive to build intelligent and digital power plants.
2021 S2 v.27 [Abstract][OnlineView][Download 1631K] - ZHU Peiyu;CHN Energy Estates Management Co.,Ltd.;
Storing CO_2 in saline formations is the largest and most promising method for geological storage. The mechanism of CO_2 storage in saline formations and the main development in engineering applications were summarized. The complex mechanism of CO_2 storage in saline formations is the result of a combination of physical and chemical capture mechanisms.The mechanism of structural formation storage, hydraulic storage mechanism, irreducible gas storage mechanism, dissolution storage mechanism and mineralization storage mechanism were reviewed. Current CO_2 geological storage projects prove feasibility of CO_2 sealing in saline formations. However, there are still many issues remain to be resolved, such as different detection techniques under different geological conditions of worldwide geological storage projects, and there are also different regulation issues, while their economics are required to be further understood for deploying CCUS in saline formations successfully.
2021 S2 v.27 [Abstract][OnlineView][Download 208K] - LIU Fuguo;ZHANG Limeng;LIU Ke;WANG Shouen;Shandong Electric Power Research Institute;State Grid Shandong Electric Power Research Institute;
The incoming coal supervision is one of the most important daily work of the power plant. Coal quality supervision usually focuses on absolute coal quality, ignoring the stability of coal. With the change of power generation situation, the fluctuation of coal quality in power plants is receiving more and more attention. The advanced data mining technology was applied to the coal quality parameter analysis in power plant, and the consistency analysis method of incoming raw coal based on Gaussian mixture model was established. This approaches can judge whether the incoming coal changes abnormally, infer whether the coal may contain other unknown coal, and estimate the parameters and content of the unknown coal by maximum likelihood estimation. The quality parameters of standard raw coal and sample set of the incoming coal were taken as the known conditions. In order to judge the consistency of incoming coal, a priori hypothesis was proposed. It is assumed that the incoming coal contains standard raw coal and unknown coal. The quality parameters of the two coals are regarded as random variables subject to different normal distributions. The Gaussian mixture model was used to calculate the joint probability of all industrial analysis parameters on all incoming coal samples. According to the maximum likelihood principle, the incoming coal sample set was used to estimate the unknown coal content and distribution parameters. If the estimated content of unknown coal is very small, it is considered that the incoming coal contains only a single standard raw coal. If the estimated content of unknown coal can not be ignored, and the estimated unknown coal parameters is significantly different from the corresponding parameters of standard raw coal, it is considered that the incoming coal contains not only standard raw coal, but also unknown coal. The above raw coal quality consistency analysis method was adopted to analyze the actual incoming coal samples and simulated samples in power plant. The results show that the coal in the actual incoming coal sample is consistent with that of the standard raw coal, while there is a significant difference between the simulated sample and the standard raw coal. The simulated sample set contains 40.9% of the unknown coal. The estimation results of unknown coal parameters are in good agreement with the actual data.
2021 S2 v.27 [Abstract][OnlineView][Download 369K] - CHU Yu;Yangchangwan Coal Preparation Plant of Coal Washing & Preparation Center,Ningxia Coal Industry Co.,Ltd.;
In order to meet the production demand, the plant modified the production process, designed and installed a coal blending flap to adjust the blending ratio of washed granular coal and screen coal, compiled coal blending control program to calculate and monitor the ash content of washed and mixed coal, installed a mixer to complete the homogenization adjustment of washed and mixed coal, and installed a sampler for mechanical sampling of washed and mixed coal. The blending production of washing coal with A_d ≤17% in the production process is completed.
2021 S2 v.27 [Abstract][OnlineView][Download 217K] - LI Suhuan;XIA Yunkai;College of Business Beijing Union University;Tangshan Shenzhou Machinery Co.,Ltd.;Hebei Coal Dry Process Equipment Engineering Technology Research Center;
Low-calorific value high-ash dirty coal is inevitably produced in the process of open-pit coal mining. Due to the limitation of wet separation technology, most of dirty and miscellaneous coal can not be separated, resulting in environmental pollution and resource loss. The intelligent separation of X ray lump coal can be used for the separation of >50 mm high ash lump coal, and the composite dry separator can realize the separation of 300-0 mm dirty and miscellaneous coal. The author analyzed the main factors affecting the sorting effect of X-ray intelligent dry separation equipment and introduced some application cases in open pit coal mine. The dry separation of dirty and miscellaneous coal can overcome the drawbacks of water washing process, and achieve the purpose of improving the quality and efficiency of coal, reducing environmental pollution and improving the utilization rate of resources.
2021 S2 v.27 [Abstract][OnlineView][Download 221K] - LIU Feng;LI Jun;WANG Bin;HAO Guoqing;Ordos Shendong Engineering Design Co.,Ltd.;Bulianta Coal Preparation Plant,Shendong Coal Preparation Center;Shendong Coal Group Technology Research Institute;
Monitoring and inspecting system is an important part of intelligent coal preparation plant. With the rapid development of video monitoring technology, HD network video monitoring system has been fully applied in the industrial field. The original video monitoring system of Bulianta Coal Preparation plant is analog video monitoring system, which can not meet the needs of current production and construction. Aiming at the problem, the intelligent video of coal preparation plant was studied, and a high-definition network intelligent video monitoring system was established. It realizes a comprehensive dynamic intelligent video system integrating production management, equipment management, personnel management and environmental management.
2021 S2 v.27 [Abstract][OnlineView][Download 119K] - LIU Ancang;HUANG Helong;XIE Yingwan;GUO Kai;WU Kunsong;South Branch of Huaneng Group Co.,Ltd.;Shantou Power Plant,Huaneng Power International Co.,Ltd.;
In order to improve the safety of the coal conveying corridor production system, personnel access violations of the power plant coal conveying process was analyzed.Based on the research of personnel abnormal construction work(not wearing a helmet, wear short-sleeved),and abnormal phenomena such as belt running deviation integrated coal, on the basis of research and development of a coal safety monitoring management system of intelligent video identification has been developed and applicated in Huaneng Shantou power plant international success. The system usd deep learning algorithm model, intelligent video logic analysis and automatic control technology to identify each fixed point camera one by one, and realizes dynamic continuous video monitoring and real-time alarm of coal transportation corridor, which solved the shortage of manual and machine periodic inspection and reduces the operation risk of coal transportation corridor.
2021 S2 v.27 [Abstract][OnlineView][Download 535K] - HUAN Xuan;LUO Yunfei;JIANG Ying;Leontech Intellingence & Information Tecnonlogy Co.,Ltd.;Infinity Intellingence & Information Tecnonlogy Co.,Ltd.;School of Emergency Management,Institute of Disaster Prevention;
The traditional artificial practices of coal quality inspection has seriously restricted the high-quality development of coal industry. At a time when technologies such as big data and artificial intelligence are becoming more and more mature, online control and intelligent analysis technology, which integrates sampling, sample preparation and testing technology, has become an important development direction in the field of coal quality inspection. In order to further improve the intelligent control level and inspection efficiency of the whole process of sampling, sample preparation and testing, and promote the intelligent development of domestic coal quality inspection and control, the concept of coal quality inspection digital center with integration of sampling-preparation-test, unattended and fully automatic operation was proposed. This paper presented the overall structure of digital center for coal quality inspection, studied the main components and functions of its sampling-preparation-test equipment layer, coal quality information management layer and data interaction layer, expounded the information collection and data interaction mode of the center operation management, and described the detailed business process. To ensure that the operation of digital center can meet the requirements of national standards, a series of improvement schemes for key intelligent equipment were put forward. Taking robot and intelligent production line as the execution carrier, a series of new intelligent equipment for coal quality inspection had been developed, and all links such as sampling, preparation, sample separation, storage, testing, data analysis and control were opened. A new type of coal quality inspection digital center integrating intelligence, informatization and standardization had been built to eliminate human interference, reduce errors, improve the quality and efficiency of coal inspection, and finally realize the effective control and supervision of the quality of coal and other bulk minerals.
2021 S2 v.27 [Abstract][OnlineView][Download 465K] - XUE Hongwei;LIU Xianwang;YANG Juanli;GAO Pan;WANG Yun;CHN Energy Shendong Coal Preparation Center;Xi′an Huaguang Information Technology Co.,Ltd.;
For belt conveyor of coal preparation plant existing longitudinal tear proof protection device "single point" of the existence of discriminant limitations and misoperation rate is quite high, and case according to the longitudinal tearing occurs, belt conveyor tearing protection system was developed with the bandwidth detection, the foreign body detection and side with the scratch of longitudinal tear protection system.The system mainly uses the deep learning model YOLOv3 and the historical Gaussian statistical model to realize bandwidth detection, foreign body detection and scratch detection respectively.The results are obtained by comprehensive logic judgment. When the judgment result is longitudinal tearing fault, real-time alarm and linkage control are directly carried out.Results show that the system is easy to implement, model accuracy and real-time performance meet the requirements, solving the existing protection against longitudinal tearing device limitations "single point" of the existence of discrimination and high rates of misoperation in Shendong Shangwan Coal Preparation 218 belt conreyor.Meanwhile, it reduces downtime caused the misoperation, prolongs the equipment running time, and improves the working efficiency.
2021 S2 v.27 [Abstract][OnlineView][Download 332K] - CHEN Deren;FENG Kui;XU Fei;LI Xiang;WANG Qingzhao;CHN Energy Nanjing Coal Quality Supervision and Inspection Co.,Ltd.;
Automatic coal sample preparation system is a new intelligent product widely used in the field of coal testing in recent years.At present, there is no special performance test standard at the national or industry level, and the performance test is mainly carried out according to GB/T 19494.3-2004 "Mechanical sampling of coal Part 3:Determination of precision and bias test",DL/T 1339-2014 "Performance test code on crushing-dividing combined sample preparation equipment at coal-fired power plants" and GB/T 474-2008 "Method for preparation of coal sample".According to the actual operation and performance test experience of the automatic coal sample preparation system, the deficiencies of the current precision and bias test methods were analyzed, and a new method combining precision and bias test was creatively proposed.The new method used a riffle to divide the coal sample into four parts, two of which were prepared by artificial method to obtain the reference samples of ash bias test and total water bias test respectively, and the other two samples were prepared by automatic coal sample preparation system and collected at different levels according to the test requirements.The results of precision test, ash bias test and total moisture bias test were obtained by statistical analysis of the four samples in different combinations.The new method can improve the representativeness of precision and bias test results, reflect the precision and the bias of all the sample preparation schemes, improve the efficiency of the performance test, reduce the impact of the performance test on the normal production of enterprises, and provide ideas and basis for the formulation of the performance test standard of the automatic coal sample preparation system.
2021 S2 v.27 [Abstract][OnlineView][Download 145K] - ZHANG Maolong;WANG Jinhui;ZHAI Xiaojun;LYU Haisheng;GUO Tao;Huaneng Clean Energy Research Institute;Northwest Electric Power Design Institute of China Power Engineering Consulting Group;Shanxi Guojin Electric Power Plant;
By analyzing the draws of traditional static coal separator and the need of modern pulverizing system, the new-type double control shunt coal separator was designed out. By adding one-stage axial baffle and optimizing the structure, the fineness of pulverized coal at the outlet of separator, R_(90) can arrive at 19.72% while the uniformity coefficient can reach 1.437,which is similar to the efficiency of the combined dynamic separator. Since the new-type double control shunt coal separator has no rotating machinery, it can save electricity in 185 000 kWh and save money 60 000 yuan per year, compared with the combined dynamic separator.
2021 S2 v.27 [Abstract][OnlineView][Download 453K] - DAI Zhixu;DENG Wuxian;LYU Youchang;ZHANG Chuangye;MA Xiaohong;WU Yan;No.12 Mine of Pingdingshan Tian′an Coal Co.,Ltd.;College of Civil and Transportation Engineering,Shenzhen University;
In view of the difficult technical problems of mining and drainage of high geo-stress, high gas, low permeability and low strength coal under the condition of deep close distance coal seam group, the collaborative mining technology of "protection seam mining under complex conditions-coal gangue separation-comprehensive harness of gas" was proposed. Engineering practice was carried out in No.12 Pingdingshan Coal Mine. The underground coal gangue separation system was established to realize coal gangue separation and gangue underground backfilling. Meanwhile, the gas three-dimensional drainage system, surface gas power generation system and waste heat utilization system of gas power generation were established to realize the safe pressure relief extraction and clean utilization of gas. The practice results show that the application of collaborative mining technology in No.12 mine has achieved remarkable economic and social benefits, realized the safe, efficient and green co mining of coal and gas, and provided important technical reference for mines with similar geological conditions.
2021 S2 v.27 [Abstract][OnlineView][Download 555K] - WEI Junjun;ZHANG Bingxiang;YAN Shaoyong;LI Libing;CHN Energy Shendong Coal Preparation Center;
Vibrating screen is an important equipment used to complete the screening of materials in coal, mining and other industries.The working principle is to use the shaker beam as a support to connect the shaker.The vibration force generated by the shaker was transmitted to the sieve plate in the form of periodic reciprocating vibration to complete the coal material separation work.In view of the lack of a unified and scientific maintenance plan for the repeated cracking of the transverse screen and side plate of the coal preparation plant, the quality of maintenance varies with the skill level of the maintenance personnel and welding methods.It was certain difficulties to the slime-water separation process of the coal preparation plant, and even affected normal production.The author combines years of vibrating screen repair experience and the principle of vibrating screen structure to sort out a complete and scientifically guided repair plan.This scheme has been tested in the coal preparation plant of Shendong Coal Group, which is consistent with the expected results.
2021 S2 v.27 [Abstract][OnlineView][Download 170K] - ZHANG Bingxiang;Shendong Coal Preparation Center;
Due to the thinning thickness of 2~(-2) coal seam, the top and bottom plates were mixed seriously during the mining process, the ash content of the raw coal was increased and the gangue was muddied to a large extent. Therefore, in the washing process, the working condition of coal sludge water system deteriorates, and it is more difficult to improve the raw coal inclusion rate. There is a big improvement after the new plate and frame system is put into operation, but the block fine coal crusher clogs frequently, which seriously affects the normal operation of the system. In order to solve this bottleneck problem, Shigetai coal processing plant renovates the block fine coal transfer scraper, improves the scraper screen process, and realizes the Shendong scraper screen pre-classification system to help improve quality and efficiency.
2021 S2 v.27 [Abstract][OnlineView][Download 128K] - GAO Wenge;Shendong Coal Preparation Center;
Convict vibrating screen discharge box in the daily operation of frequent breakage accidents, seriously affect the normal production of the system, therefore, for the Shendong linear vibrating screen discharge box for the localization of transformation. The system discussed the overview of the linear vibrating screen discharge box in the coal processing plant, analyzed the failure according to its operation status, avoids the environmental pollution problem in the production process through the localization transformation, and ensured the efficient operation of the production.
2021 S2 v.27 [Abstract][OnlineView][Download 266K] - WU Kui;CHN Energy Shendong Coal Preparation Center;
Dense medium cyclone is commonly used as coal preparation equipment.As the center of the coal preparation process, heavy medium cyclone tends to be stable.Dense medium coal separation has many advantages, such as high separation precision, high quality of clean coal, strong adaptability to raw coal, easy to realize automatic control, etc.. This paper first introduced the influencing factors of the dense medium cyclone, described the application status of the dense medium cyclone in Shendong coal-to-oil coal preparation plant, then studied the structural parameters of the dense medium cyclone in coal-to-oil coal preparation plant, and obtained the optimal length of the cylinder, overflow pipe range and insertion depth, etc.
2021 S2 v.27 [Abstract][OnlineView][Download 537K] - ZHANG Jingyuan;Equipment Maintenance Center,CHN Energy Shendong Coal Group Co.,Ltd.;
The problem of medium loss is prominent in the process of heavy and medium separation. In order to save iron ore resources and enhance the economic benefits of coal preparation plant, it is necessary to strengthen the medium recovery and utilization. Magnetic separation is the main way of medium loss, it is necessary to understand the properties of magnetic separation tailings to improve the recovery effect. In view of the difficult problem of recovery of micro-fine magnetic minerals from magnetic separation tailings of a coal preparation plant in Shendong, a magnetic disk drive for iron ore was improved to be used for medium recovery in coal preparation plant. By optimizing the working parameters of disk magnetic separator processing capacity and speed, the recovery rate of magnetic material can reach 78.83% under the conditions of disk rotating speed of 6 r/min and processing capacity of 600 m~3/h.The working state of the disk machine is stable, and the magnetic content of the tailings of the magnetic separator is reduced from 0.12% to 0.032%,which significantly reduces the production cost of the coal preparation plant.
2021 S2 v.27 [Abstract][OnlineView][Download 269K] - ZHANG Lei;SHI Yawen;KANG Xuegang;Daliuta Coal Preparation Plant,CHN Energy Shendong Coal Preparation Center;
In order to solve the problems of large rake pressure and high moisture of crude coal slurry in the thickener, the operation effect of hydroclassification cyclone was investigated by measuring the cyclone inlet, bottom flow and overflow concentration, calculating the bottom flow fraction and bottom flow solids recovery rate and cyclone classification efficiency, etc. The results show that the concentration of the same group of cyclone with different diameter of bottom flow port is different, the bottom flow concentration of bottom flow port 70 mm is 1.21-1.37 times of 75 mm and 2.34-3.00 times of 80 mm. The smaller the bottom flow opening, the higher the bottom flow concentration and the stronger the concentration effect. Hydroclassification cyclone has different degrees of bottom flow pinch thin and overflow run coarse phenomenon. Under the same conditions, the smaller the diameter of the bottom flow port, the heavier the degree of bottom flow entrainment, which indicates that the greater the concentration of the feed, the heavier the degree of overflow runoff. The positive matching efficiency of coarse grains can be more than 90%,but the positive matching efficiency of fine grains is as low as 66%. The bottom flow entrainment fineness is the main reason affecting the total efficiency of the classifying cyclone, and the bottom flow concentration has great influence on the classification efficiency. Therefore, by reducing the inlet cyclone feed concentration and replacing the 80 mm bottom flow port of the same cyclone with 70 mm bottom flow port, the product moisture of the coarse coal slurry centrifuge was reduced and the unfavorable situation of high rake pressure was changed to achieve the purpose of the study.
2021 S2 v.27 [Abstract][OnlineView][Download 119K] - LI Suhuan;XIA Yunkai;College of Business,Beijing Union University;Hebei Coal Dry Processing Equipment Engineering Technology Research Center;
The current problems in the automation system of dry coal processing plant were systematically elaborated, and the intelligence of dry coal processing plant should focus on developing intelligent control system of dry coal processing mainframe. Relying on modern computer network technology, the intelligent control system of dry coal processing plant was built, and the intelligence of raw coal selectivity analysis, dry coal processing process decision, host operation parameter control, sorting effect data statistical analysis and operation and maintenance of power supply and distribution and electromechanical equipment was realized, so as to complete the change of production management mode of dry coal processing plant. The objective of the intelligent system design and planning of dry coal processing plant is to establish and improve the intelligent control level of dry coal processing plant, to achieve intelligent sorting process decision, equipment control and production management, and to improve the competitiveness of dry coal processing enterprise.
2021 S2 v.27 [Abstract][OnlineView][Download 166K] - MA Zhiguang;Shandong Boxuan Mineral Resources Technology Development Co.,Ltd.,Zibo Mining Group;
The continuous improvement of raw coal selection rate leads to the increase of slime content in the separation system and slime products reduction has become an urgent problem to be solved. In view of this problem, the scheme of slime cutting and slime precipitation mixing were explored and implemented to improve quality and efficiency in Zhengtong Coal Preparation Plant. The slime product yield is reduced by 7.3% and the annual income increases by 100 million yuan, effectively achieves the purpose of reducing slime product quantity and good economic benefits.
2021 S2 v.27 [Abstract][OnlineView][Download 130K] - WANG Zijuan;Shendong Coal Group;
In order to solve the problem that the medium is difficult to pass through the sieve in the process of desiccating and screening in a coal preparation plant in Shendong, this paper built a laboratory research system of desiccating and screening water spraying optimization, studied the influence of the nozzle type, the direction of water spraying and the arrangement of water retaining weir on the content of magnetic material on the screen, determined the optimization scheme of the water spraying system, and carried out the application practice. The results show that the linear nozzle under the condition of thick coal seam has strong penetration ability with good removal of medium, and the content of magnetic material on the screen was reduced by more than 35% compared with the field nozzle. The direction of spraying water has a great influence on removal of medium, and the best effect is to spray water at 20° against coal flow. When the horizontal distance between the water retaining weir and the nozzle was the same as the height of the water retaining weir, the effect of removing medium is good. Using the above optimized scheme, the content of magnetic material on the desiccating screen in coal preparation plant is reduced to less than 0.1 kg/t, and the overall dielectric consumption is reduced by more than 16%.
2021 S2 v.27 [Abstract][OnlineView][Download 266K] - ZHANG Cai;SONG Yunxia;Luliang Longyu Washing Co.,Ltd.,Shanxi Yaxin Energy Group;Tangshan Research Institute Co.,Ltd.,China Coal Technology and Engineering;
The current type of flotation equipment used in the coal industry was introduced in my country, including foreign flotation machines introduced by the coal mining plant and my country′s autonomous research and development, widely used in the ejection flotation machine, flotation column, microbubbles flotation machine and mechanical stirred flotation machine. The working principle and structural characteristics of various types of flotation equipment was introduced, and proposed the development direction and trend of my country′s coal mortal flotter equipment.
2021 S2 v.27 [Abstract][OnlineView][Download 188K] - SU Jian;Shendong Coal Preparation Center;
The influencing factors of concentrator effect in coal preparation plant was analyzed, and the method of improving the treatment effect of the thickener and the practical transformation were put forward. Under the existing conditions, through adjusting the hydrocyclone parameters, modifying the way of adding chemicals, modifying the mixing device, strengthening the operation level of the equipment and improving the sedimentation effect of the concentrating equipment, the settling efficiency of the concentrating mechanism is improved.
2021 S2 v.27 [Abstract][OnlineView][Download 139K] - WANG Zhidong;Petrochina Changqing Oilfield Company;
In order to improve the flotation effect of lignite, on the basis of proximate analysis and other basic properties analysis, the emulsified diesel with high stability was prepared by exploring the best HLB value, oil-water ratio and combination of emulsifiers. The results show that the ash content of clean coal is 17.80% and the combustible recovery is 78.34% when the collector dosage is 80 kg/t dry coal slime with conventional diesel flotation machine separation. The ash content of clean coal is 17.65% and the combustible recovery is 81.53% when the collector dosage is 10 kg/t dry coal slime with emulsified diesel flotation machine separation. And the collector dosage is 4 kg/t dry coal slime, the ash content of clean coal is 17.39% and the combustible recovery is 80.24% with emulsified diesel flotation column separation. Combined with reagent emulsification and flotation column separation technology, the fine lignite slime can be effectively separated, the ash content can be further reduced, and the resource utilization efficiency can be improved.
2021 S2 v.27 [Abstract][OnlineView][Download 215K] - LI Wenting;CHN Energy Shendong Coal Group Distribution Center;
With the increase of the mechanization degree of coal mining and coal preparation, the amount of slime increases greatly, and the output of fine coal preparation products also increases greatly. The increase of fine coal slime content makes it difficult to treat coal slime water, to recover coal slime from dehydration and to realize solid-liquid separation. The problems of plate and frame filter press in Shigetai coal preparation plant was analyzed.It is found that high moisture content of fine coal slime, low treatment capacity and large amount of fine coal slime are the main problems in Shigetai Coal Preparation Plant, then from the aspects of working parameters and feeding properties. The strategy of improving the efficiency of plate-frame press filter in Shigetai Coal Preparation Plant was put forward. The practice shows that the hourly capacity of plate and frame filter press is increased from 20.0 t/h to 24.2 t/h, and the average moisture content of product is decreased from 33.78% to 30.46%. It is expected to save about 60 000 yuan per year in pharmaceutical costs and 240 000 yuan in media purchasing funds, with an annual increase of 2 million yuan.
2021 S2 v.27 [Abstract][OnlineView][Download 170K] - LU Xianlu;Qipanjing Coal Preparation Plant,CHN Energy Mengxi Coal Chemical Co.,Ltd.;
With the gradual deterioration of the raw coal quality at the Qipanjing Coal Preparation Plant, it was sometimes difficult for the flotation system to separate the qualified concentration products. In order to explore the problems existing in the flotation system, small screening, small float-sink, and timed-release flotation tests were used to analyze and evaluate the feed, concentration, and tailings of the flotation system. The flotation machine and flotation column in the laboratory were used to optimize the first-stage and second-stage flotation, which provided certain guidance and assistance for improving the flotation performance of coal slime. For the first-stage, the flotation perfection index, the concentration yield and concentration ash content are only 18.88%,41.68% and 11.95%,respectively. The ash content of fine particles is relatively high and accounts for a large proportion, which is the main reason for the concentration ash content to exceed the standard. A large amount of low ash coal particles are lost in the tailings in first-stage flotation process, resulting in only 23.85% of the ash content of the flotation tailings. The tailings of the first-stage flotation are used as the feed of second-stage flotation. The concentration yield of the second-stage flotation is 48.66% and the ash content is 14.43%. The particle with various sizes are not effectively separated. More coal particles with low ash content are lost to the flotation tailings, making the tailings ash content only 35.22%. Thus, the flotation system of this plant is difficult to separate the concentration products with the qualified ash content, and the separating efficiency is very low. According to the characteristics of the coal slime in this plant, the flotation machine and flotation column optimization tests in the laboratory were carried out. The first-stage flotation feed was used for the flotation machine tests by the different reagents. The concentration ash content was still unqualified, and the ash content of the tailings basically did not exceed 40%. The second-stage flotation feed was used for the flotation machine tests by kerosene and secoctyl alcohol. The concentration ash content was relatively high and above 14%. However, the cyclone microbubble flotation column could make the ash content of the first-stage and second-stage flotation concentrations meet the requirement. The concentration yield of the first-stage flotation reached 75%,and the tailings ash content was above 65%. Therefore, it is recommended that the original flotation machine should be replaced by the flotation column in this plant. The technical problems of the concentration with high ash content and low yield will be solved and the considerable economic benefits will be created for this plant.
2021 S2 v.27 [Abstract][OnlineView][Download 405K] - WANG Ruibin;Coal Oil Preparation Plant,CHN Energy Shendong Coal Preparation Center;
In most coking coal preparation plants in China, flotation technology is mainly used for the separation of coal slime, and obvious results have been achieved, whereas most raw coal in China belongs to low rank coal, and because of the low rank coal contains more oxygen-containing functional groups, its floatability is lower, the coal slime of the corresponding coal preparation plant has not been effectively processed and utilized. In addition, most low-rank coals have low internal ash and good gasification reactivity. The low-rank coals can be used as fine oil coal slurry or fine water coal slurry. Slime flotation is the best way to reduce the ash and improve the quality of coal slime. The floatability of low rank coal slime is relatively poor and the flotation speed is slow, but its surface hydrophobicity is stronger than that of other ash forming minerals. This paper first introduced the research status of low-rank coal flotation, then described the features of flotation fine dewatering equipment, then analyzed the coal slime drying technology and mode selection, finally put forward the development trend of flotation technology.
2021 S2 v.27 [Abstract][OnlineView][Download 110K] - QI Jinxiu;Shendong Coal Preparation Center;
In order to give full play to the subjective initiative of reducing staff and increasing efficiency, the reform of the income distribution system is promoted in depth and the goal of controllable labor cost is achieved. The application of labor quota was continuously strengthened, and the internal market was carried out in depth to give full play to the leverage of salary distribution. By stimulating individual vitality, production organization efficiency and job efficiency were further improved to achieve the purpose of cost reduction and efficiency increase.
2021 S2 v.27 [Abstract][OnlineView][Download 97K] - BAI Fuqiang;WANG Zhenlong;Shendong Coal Preparation Center;
Cost reduction, quality improvement and efficiency enhancement are important aspects of coal preparation plant management. The characteristics of lean management and the inefficient links in the production management process were analyzed. And a series of control and optimization measures were proposed, thus effectively playing the role of improving quality and increasing efficiency. Refine the management tools of coal preparation plant to create greater economic benefits by reducing production costs.
2021 S2 v.27 [Abstract][OnlineView][Download 102K] - ZHANG Lei;KANG Xuegang;SHI Yawen;Daliuta Coal Preparation Plant,CHN Energy Shendong Coal Preparation Center;
In order to study the influence of production methods and product structure on economic efficiency of power coal beneficiation plant, the economic efficiency of coal beneficiation plant under eight specific production methods and different product structures were measured based on the production data of Daliuta Coal Preparation Plant and different commodity coal prices. The results show that the higher the feed rate does not necessarily lead to the increase of economic efficiency, and the product structure plays a crucial role in the high or low economic efficiency. From the perspective of economic efficiency measurement, the pre-selection pulverization process is not the optimal process. The analysis of the reasons for the different economic efficiency shows that: the price per unit of heat of different commercial coals has notable influence on the economic efficiency. Under the same production method, if the product structure must have extra low ash or Shenyu2,the economic efficiency of all Shenyu2 is greater than that of all extra low ash. When the product has fine lump 4,extra low ash or Shenyu2,the economic efficiency is higher than that of single blended coal, and the economic efficiency of single blended coal is not necessarily less than that of different coal types. The economic efficiency of non-blended coal is higher than that of single blended coal. The economic benefit of single blended coal is not necessarily smaller than the economic benefit of different coal blends. Non-technical economic factors have certain influence on the economic benefit of power coal processing plant, which should be paid enough attention.
2021 S2 v.27 [Abstract][OnlineView][Download 134K] - WU Minjie;Xi′an Research Institute of China Coal Technology & Engineering Group Co.,Ltd.;
Through a series of experiments such as maceral analysis, scanning electron microscope observation and industrial analysis, the coal quality characteristics of sapropelic briquette in several coal mines in Southern Shaanxi were analyzed. It is considered that the coal in the study area belongs to high metamorphic anthracite, and the organic group is gray-white sapropelic matrix, and the biological structure is not obvious. The mineral content in coal was 2%-23%,uneven wave extinction and particle mosaic were observed. Under scanning electron microscope, the organic matter of coal samples was mainly sapropelic, and under high power electron microscope, the organic matter on coal surface was mostly distributed in strips. The content of minerals in coal samples was relatively high, and the degree of automorphism of minerals was high. The results of industrial analysis show that the coal in this area is mainly middle-high ash coal.
2021 S2 v.27 [Abstract][OnlineView][Download 257K] - LU Jianwen;WANG Hong;LU Peishan;FU Lijun;JIANG Xin;JIA Xiaozong;Baotou Iron and Steel(Group)Co.,Ltd.;Shanxi Yaxin New energy Technology Co. Ltd.;
Based on the production process parameter data such as coal quality index, coke quality index and coking time accumulated in the coking process of industrial coke oven in coking plant, this paper constructed the analysis data set, analyzed the data by using intelligent analysis algorithms such as Extreme Gradient Boosting Trees, and explained the coking mechanism. The relevant factors affecting coke quality were found out, which provided guidance for coking production and improving coke quality in coking plant.
2021 S2 v.27 [Abstract][OnlineView][Download 151K] - DING Haoxuan;WU Zhenkun;TANG Wen;QIAN Peng;MENG Shaojun;China Power Huachuang Electricity Technology Research Co.,Ltd.;Huainan Pingwei Power Generation Co.,Ltd.;China Power Shentou Power Generation Co.,Ltd.;
It is an important basis for the safety and economy of the boiler to master the coal quality composition of the coal.The calculation of transformation between element analysis and coal industry analysis was studied.100 groups of data of coal quality composition were collected, and the shortcomings of traditional calculation formulas were analyzed.The formulas for calculating carbon, hydrogen and nitrogen were improved. And the elemental analysis regression model based on support vector was established.Finally, the results of traditional formula, improved formula and regression were compared.The results show that compared with the traditional formula, the R_(MSE) of carbon, hydrogen and nitrogen calculated by the improved formula is reduced by 16.05%,83.53% and 36.36%.In the test set data, the R_(MSE) of the regression model in the composition calculation of carbon, nitrogen and oxygen was lower, which was 0.893,0.116 and 0.924,while the RMSE of hydrogen element calculated by the improved formula is the lowest(0.037).
2021 S2 v.27 [Abstract][OnlineView][Download 304K] - YAN Liqiang;LEI Lei;WANG Baorong;LI Wenchao;WANG Jieping;XIE Quan′an;Tangshan Shougang Jing Tangxishan Coking Co.,Ltd.;College of Chemical Engineering,North China University of Technology;
Coke quality prediction is in favor of improving coke quality and reducing the cost of coal distribution for steel companies. Coke quality prediction includes multilinear regression analysis, BP neural network, LIBSVM and other algorithms, most of which are based on coal proximate analysis in dicators and caking indicators.Based on the basic index of coal, combined with coal petrography analysis index, KNN and SVR algorithms were used to predict the strength and thermal performance of coke machinery. The method combined macro and micro indexes of coking coal to predict coke quality. Through the comparison of 6 factors and 9 factors, it is concluded that the prediction accuracy of basic properties combined with coalpetrography properties including vitrinite reflectivity, active parts, inert parts is higher. The relative error of the KNN algorithm is smaller than that of the SVR algorithm. Through parameter tuning of the KNN algorithm when the kernel parameter K=9,the MSE is the smallest. The relative errors of the predicted cold strength(M_(40),M_(10))and thermal properties(C_(RI),C_(SR))of coke are 0.38%,0.98%,0.82% and 0.17%.
2021 S2 v.27 [Abstract][OnlineView][Download 194K] - ZHANG Yunpeng;BAI Xiangfei;DING Hua;WANG Dongsheng;Beijing Research Institute of Coal Chemistry,CCTEG China Coal Research Institute;State Key Laboratory of Coal Mining and Clean Utilization;
In order to meet the demand of coal ash high temperature viscosity measurement and break the foreign monopoly of coal ash viscosity measurement instrument, it is necessary to research and develop the coal ash high temperature viscosity measurement system. The degree of automation and efficiency of testing system are improved by combining testing device with software control system. The present foundation and progress of high temperature vertical tube furnace, high temperature viscometer and automatic control of coal ash viscosity tester were discussed. The development of coal ash high temperature tester in China was compared with the same type of equipment and two kinds of testing methods at home and abroad, and the research status of this type of equipment in China was also discussed. In the process of coal gasification, the technology of liquid slagging is more and more widely used. The viscosity control of coal ash at high temperature is related to the smooth operation of the liquid slagging gasifier. Therefore, the research and development of high temperature viscosity measuring device for coal ash is particularly important for the determination of coal ash viscosity index.
2021 S2 v.27 [Abstract][OnlineView][Download 184K] - LI Jun;Yulin Shenhua Energy Co.,Ltd.;
Yulin Shenhua Qinglongsi fine coal was used as raw material to investigate the feasibility of blending the ingredients, the effect and mechanism on the performance(concentration, viscosity and stability) of coal-water slurry by blending the raw material, the end of lanthan. The effects of different raw material ratios, additive types and dosages on the properties of coal-water slurry were investigated. The results show that the blending of lanthanum powder will rapidly increase the viscosity of coal-water slurry with average slurry formation. The introduction of additive NBS-1 B greatly improves the slurry-forming property of coal-water slurry. The best performance of the water-coal slurry is achieved when the reference ratio of fine coal to lanthanum is 7∶3,the concentration of water-coal slurry is 60%,and the amount of additive is 0.7%.
2021 S2 v.27 [Abstract][OnlineView][Download 193K] - FANG Xinhui;National Institute of Clean-and-Low-Carbon Energy;
The gasification process is difficult to reflect the real-time operation condition of gasifier in time due to its fluctuation of coal quality, complexity of reaction system and lag of instrumentation measurement, which makes the operation of gasifier often suffer from conservative operation and response lag. To address these problems, the application of advanced control technology(APC)to the gasifier will help improve the smooth rate and optimization space of the gasification unit. The 3 000 t/d coal-water slurry gasifier of National Energy Investment Group's Yulin Chemical Company has been driven successfully, and its complete measurement instrumentation and reliable DCS system make it a basis for implementation as an advanced control technology. The super-large coal-water slurry gasifier of Yulin Chemical Company was taked as the entry point of smart plant development practice, and the application and research progress of advanced control technology was introduced in coal gasification plant from three aspects, namely, improving the self-control commissioning rate of coal gasification plant, digital twin of gasifier and multi-variable cooperative constraint control. Results show that the loop rectification software PID-GO is used to control the 35 control items of No.1. The excellent commissioning rate of the gasification plant is increased from 44% to more than 84%,and the commissioning rate of the automatic control is increased from 65% to more than 91%.The steady-state and dynamic digital twin models are established by Unisim. The syngas temperature, crude syngas flow rate and main gas components calculated by thesteady-state model can match with the operating values, and the relative error of simulation is less than 5%,and the dynamic model captures that a decrease in coal slurry flow rate from 140 m~3/h to 100 m~3/h within 1 minute results in a short time over-temperature increase in gasification temperature from 1 276℃ to 1 461℃.The dynamic linkage between the multivariate co-optimization software PD-Master and Unisim model is implemented on the simulation platform. Through the rolling optimization of PD-Master, the optimized variables of the gasifier all achieve the established optimization targets, and the calculated values of oxygen-coal ratio, gasifier temperature, syngas flow rate and effective gas content are within 2.2% of the target value, and the deviations of the variables with the highest weights, C_(V1) and C_(V2),are-0.06% and 0.11%,respectively.
2021 S2 v.27 [Abstract][OnlineView][Download 1051K] - JIAO Yupei;CUI Haijun;Shanghai Churui Low Carbon Energy Technology Co.,Ltd.;Shanghai Coking Co.,Ltd.;
The coal gasification technology is the key means to realize clean and effectire utility of coal. In this paper, fluidized bed gasification technology of pulverized coal was introduced. Compared with fixed bed and airflow bed, gasification technology has many advantages such as wide adaptability of coal, simple pretreatment of raw coal, moderate gasification temperature, wide range of load regulation, etc. The advantages of zero emission gasification technology of fly ash in many fluidized bed gasification technologies are emphasized.
2021 S2 v.27 [Abstract][OnlineView][Download 423K] - HOU Zhiyong;HAO Liangliang;SHEN Xiaorui;WANG Zhenping;GAO Wei;Shenmu Branch of Shaanxi Coal Chemical New Energy Technology Co.,Ltd.;
Due to the poor performance or operation level of current coal gasification technology and equipment, a large number of coarse and fine slag will be produced in the gasification process.The carbon content of gasification fine slag is high(more than 50%),which can not be directly used in construction and road materials. Both flotation and combustion decarbonization face the problem of high cost and lack of industrialization. Through the detection and analysis of the basic physical and chemical properties of gasification ash. It is found that gasification fine slag has high carbon content, high silicon and aluminum content in ash, large specific surface area and developed surface pores of residual carbon, which is an ideal raw material for the preparation of adsorption materials.The research status and application prospect of gasification ash preparation of activated carbon like materials, zeolite, molecular sieve, carbon silicon composites and water treatment technology were compared.
2021 S2 v.27 [Abstract][OnlineView][Download 216K] - LI Jun;LI Jingfeng;ZHAO Yang;SUN Kaidi;LIU Zhen;National Institute of Clean-and-Low Carbon Energy;CHN Energy Investment Corporation;CHN Energy Investment Corporation Shendong Coal Group;College of Chemistry and Chemical Engineering,Xi′an University of Science and Technology;
Graphene has excellent properties, and it is considered as the most promising novel carbon material in the 21 st century. As a low-value resource with high carbon content, the reserves of coal are huge in our country. High-value coal-based carbon materials such as graphene and its compounds can be prepared by treating coal by a series of methods, which helps upgrading coal from fuel to feedstock with the proposal and implementation of carbon neutral target. In this paper, the basic situation of China Energy Investment Group was introduced, and strategic plan of development of coal-based materials was stated. Based on the properties and major performances of graphene, the related concepts were listed, different preparation methods were summarized, the preparation methods from coal to graphene were also introduced. Firstly, the fundamental reason for carrying out the research on coal to graphene was explained. Secondly, main process routes of coal to graphene were introduced. Different kinds of coal were used as raw materials, including anthracite coal, bituminous coal, as well as low-rank coal such as lignite. Moreover, the present industrial situation of coal to graphene was briefly introduced as well as the advantages and disadvantages of coal based graphene. Finally, the research direction and development of coal-based graphene were prospected.
2021 S2 v.27 [Abstract][OnlineView][Download 251K] - MIAO Jianjie;LI Debo;LI Huijun;School of Energy Power and Mechanical Engineering,North China Electric Power;Southern Power Grid Electric Power Technology Co.,Ltd.;
Artificial Neural Network(ANN)can be well described with nonlinear relationship between heat-resistant area of boiler, which is better to predict the degree of heating area ash of the boiler. The paper summarized the relevant research status from the construction of the ANN ash prediction model, the selection and processing of vector data, predicting evaluation indicators, and network optimization. It is believed that in the construction of the prediction model, the output vector selects the parameters of the actual operation of the boiler in a one-way change in the degree of grayness. The input vector used the influencing factor method based on thermodynamic balance, considering the boiler design and operating conditions, the heat surface condition was selected, and the strange value was removed, data denoising and other algorithms, the algorithm, etc. The network optimization was carried out in combination with network models, and drew on the ANN model in other predictive fields to the study, and the research and development based on deep neural network was the future of an important research direction.
2021 S2 v.27 [Abstract][OnlineView][Download 198K] - GUAN Shipian;DING Shouyi;YUE Junfeng;HUANG Yaji;CHEN Bo;LIU Xinya;XU Ligang;Jiangsu Frontier Electric Technology Co.,Ltd.;Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education,Southeast University;
The timing and quantitative soot-blowing of soot blowers is still the current soot-blowing strategy for most thermal power unit boilers with ignoring the actual soot pollution on the heating surface, which affects the safety and economy of boiler operation. The optimization of soot-blowing strategy is the key to solving this problem. From the economic point of view of unit operation, the forecast model of soot deposit change on the heating surface was analyzed, and the heat exchange gain and soot-blowing steam consumption brought by soot-blowing operation were considered. A soot-blowing optimization model with the largest net profit of soot-blowing per unit time was proposed. The results show that under the operating condition of 75% rated load, the optimized soot-blowing model can reduce the soot-blowing frequency and save the equivalent of 0.136 kg/min of standard coal heat.
2021 S2 v.27 [Abstract][OnlineView][Download 240K] - DAN Zhenyu;SHI Bin;LI Nan;XU Jia;DU Jianhua;YU Wugao;SUN Xianbin;XU Qiang;ZHAO Pengbo;Fenyi Power Plant of SPIC Jiangxi Electric Power Co.,Ltd.;Beijing Huaneng Changjiang Environmental Protection Technology Research Institute Co.,Ltd.;
In order to improve the capacity of compact split circulating ash heat exchanger(CHE)in a 330 MW circulating fluidized bed(CFB)boiler, reduce the high load bed temperature and ammonia consumption, the CHE was optimized and transformed. The resistance of air distributor in the equalizing chamber was reduced from 9 000 Pa to 6 215 Pa, and the operation of CHE was optimized. The results show that there is a positive correlation between the high temperature re-feed air volume and the bed temperature, and the adjustment range of the high temperature re-feed air of a single CHE to the overall bed temperature is 15 ℃.There is a negative correlation between the average flow air volume and the bed temperature, and the adjustment range of the single CHE to the bed temperature is 10 ℃. The heat-changing air volume of No.1 and No.2 CHE is reduce by 16 000 Nm~3/h, and the reheat temperature is increased by 5 ℃.The heat transfer coefficients of No.3 and No.4 CHE are higher than that of No.1 and No.2 CHE. The heat transfer coefficients of No.3 and No.4 CHE are 358.9 and 196 W/(m~2·℃)respectively, and the heat transfer coefficients of No.1 and No.2 CHE are 155 and 157 W/(m~2·℃)respectively. High-efficiency air distribution in CHE is "spindle-shaped",that is, the air velocity of low-temperature and high-temperature re-feed chambers at both ends is small, and the air velocity of average flow chamber in the middle is large.
2021 S2 v.27 [Abstract][OnlineView][Download 331K] - HU Jun;YANG Xigang;TIAN Shaogang;YE Aqu;HE Lucan;LIU Xiaodong;CHN Energy Bengbu Power Generation Co.,Ltd.;Southeast University;CHN Energy(Fuzhou)Thermal Power Co.,Ltd.;CHN Energy Nanjing Electric Power Test & Research Limited;
After adopting low-nitrogen combustion technology, the opposed swirling combustion boiler generally has the problem of high-temperature corrosion of the side wall water wall. A 600 MW unit equipped with closing-to-wall air was used as the research object to analyze the adhesion to the wall by CFD simulation. And the industrial test methods was used to optimize the opening of the wall-mounted air door under different loads, and the influence of the closing-to-wall air on the operation of the boiler was evaluated. The research results show that closing-to-wall air can significantly increase the volume concentration of O_2 in the flue gas near the wall of the water wall, reduce the volume concentration of CO and H_2S,effectively improve the reductive atmosphere near the water wall of the boiler, and alleviate the risk of high temperature corrosion of the water wall.According to the results of the reductive atmosphere near the wall of the water wall measured under different openings of the adjacent damper, it is recommended that the opening of the adjacent damper be maintained at 60% when the load is below 350 MW,and the opening of the adjacent damper shall be maintained when the load is above 350 MW at 100%.Finally, through industrial test methods, it is concluded that the closing-to-wall air has little effect on the thermal efficiency and steam water parameters of the boiler. As the closing-to-wall air is put into operation, the NO_x mass concentration at the outlet of the economizer has a small decrease trend. The above conclusions can provide references and references for the safe and economic operation of boilers.
2021 S2 v.27 [Abstract][OnlineView][Download 392K] - YANG Jiyuan;QIAO Junqiang;LU Haiyun;CHN Energy Shendong Coal Group Co.,Ltd.;National Institute of Clean-and-Low-Carbon Energy;
As thermogravimetric analysis is one of methods to study characteristics of combustion of coals, thermogravimetric experiments was performed for ten coals. And ignition temperature, burnout temperature and temperature at maximum reaction rate were discussed, the maximum weight loss rate and complex index evaluating the whole process of combustion were investigated. The results show that the relation between those characteristics and volatile matter content is linear. Coal No.3 whose volatile fraction is highest has max weight loss rate and the peak of the above rate is narrowest and highest, which means its combustion is fast and strength. The complex index of coal No.3 has largest value, which means its ignition is easiest, combustion is fast and burnout is best.
2021 S2 v.27 [Abstract][OnlineView][Download 281K] - ZHANG Cuiqing;ZHANG Fushui;YIN Zhigang;LU Haiyun;National Institute of Clean-and-Low-Carbon Energy;Shenhua Guoneng Baoqing Coal Electrification Co.,Ltd.;
The ignition, combustion and burnout characteristics of the original lignite and the dewaxing lignite in a 600 MW tangentially coal fired boiler were investigated by thermogravimetric analysis and numerical simulation method. The ignition temperature, mean/maximum burnout rate, maximum combustion temperature, burnout temperature, ignition index C and combustion index S were calculated from the thermogravimetric curves. The numerical simulation exhibited the temperature distribution, the residence time and the burnout rate of pulverized coal in a furnace. The results show that the dewaxing lignite can be the fuel of utility boilers. In a tangential coal fired boiler, ignition feature of the dewaxing lignite is worse than original one as its ignition distance is longer 0.108 m than the original one′s. The heights in the furnace are comparable when reaching the maximum temperature. But maximum temperature of original lignite is more than dewaxing one, and difference of maximum temperature is large which is 108 K. After ignition, the burnout of dewaxing lignite is better than original one, and burnout of former is more 0.509% than latter.
2021 S2 v.27 [Abstract][OnlineView][Download 483K] - RAN Shenming;KONG Hongbing;YANG Zhangning;ZHANG Dinghai;HE Wei;LI Zhenshan;Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province;Dongfang Boiler Group Co.,Ltd.;Dongfang Fuel Cell Technology Co.,Ltd.;Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University;
A 350 MW lignite pulverized coal opposed firing boiler was studied by the method of numerical calculation with improved char combustion model and NO_x prediction model, and the influence of different layers of micro oil ignition burners on NO_x emission, char burnout and flue gas temperature at furnace outlet were analyzed. Result predictes that the configuration of more multi-layers micro-oil ignition burners is conductive to the boiler start-up, and it will increase the NO_x emission, delay the pulverized coal combustion, and the risk of overheating and slagging of heating surface will increase. Due to the strong reactivity of lignite, the degree of burnout of pulverized coal under different working conditions is the same.Finally, it has no impact on boiler efficiency.
2021 S2 v.27 [Abstract][OnlineView][Download 460K] - CHENG Haisong;LIU Gang;CAI Peng;CHEN Chunyan;ZHAO Chao;YUE Jian;GAO Jinyu;FENG Xiaopeng;CHN Energy Tongling Power Generation Co.,Ltd.;Yantai Longyuan Power Technology Co.,Ltd.;
The non-uniform combustion of supercritical boiler leads to the thermal deviation of water wall and heating surface, which is universal. By installing an online monitoring system of furnace temperature based on acoustic temperature measurement, the plane temperature distribution can be obtained in real time. The characteristic parameters of furnace temperature deviation in width direction and depth direction can be extracted to reflect combustion deviation. Based on the closed-loop model identification, the model relationship between partial combustion characteristic parameters and secondary air distribution was established. The model predictive controller which was used to replace the original PID controller formed online optimization strategy, and then the secondary air distribution was automatically adjusted to alleviate the combustion bias. The application results in a 630 MW unit show that the mean square deviation of the wall temperature at the outlet of the vertical water wall tube decreases by 21.2%,and the mean square deviation of the wall temperature at the outlet of the front and rear platen superheaters decreases by 20.3% and 21.9%. The implementation of online optimization strategies can effectively improve the problem of uneven combustion in supercritical boilers.
2021 S2 v.27 [Abstract][OnlineView][Download 284K] - MAO Jianbo;CAI Jiecong;LIU Wensheng;YING Mingliang;State Grid Zhejiang Electric Power Research Institute;
In order to understand the operation characteristics of a 500 t/h quadrangle tangential combustion boiler, the field test method was used to systematically study it. The influence of burner operation mode, furnace oxygen, SOFA air volume, secondary air distribution mode, perimeter air volume, burner swing angle and boiler load and other factors on boiler combustion, steam temperature and NO_x emission were obtained. Results show that the NO_x concentration can be decreased to a lower level by putting lower burners into operating, reducing oxygen concentration in furnace and increasing flow rate of SOFA. Putting upper burners into operating and increasing flow rate of SOFA can help to improve steam temperature, but the heat loss of exhaust gas and incomplete combustion increase. Increasing oxygen concentration in furnace is also helpful to improve steam temperature, and there is an optimal value of oxygen concentration in furnace to make boiler running efficiently and environmentally. Different secondary air distribution modes have little influence on NO_x concentration. Inverted tower type air distribution is helpful to complete combustion of pulverized coal and improve steam temperature. Increasing perimeter air volume, swinging up main burner nozzles and swinging down SOFA nozzles increase NO_x concentration. Reducing perimeter air volume and swinging up burner nozzles can improve steam temperature and decrease boiler efficiency. Waist type secondary air distribution and swinging up burner nozzles are benefit to eliminate flue gas temperature deviation on the left and right side of furnace outlet. NO_x concentration decreases with the increase of boiler load.
2021 S2 v.27 [Abstract][OnlineView][Download 227K] - HUANG Leping;SONG Guoliang;YANG Zhao;LIU Hong;NIU Yuqi;Jimincare(Gaoan) Clean Energy Co.,Ltd.;Institute of Engineering Thermophysics,Chinese Academy of Science;
The gasification residual carbon with almost zero volatile has a high ignition point and is difficult to burn out. Therefore, efficient incineration through a circulating fluidized bed is an effective way to realize resource utilization of gasification residual carbon. Taking three 130 t/h fly ash carbon residue circulating fluidized bed boilers developed and designed by the Institute of Engineering Thermophysics of the Chinese Academy of Sciences using carbon residue combustion technology as the research object, the test conditions of different residue carbon burning ratios were analyzed, and the combustion characteristics of fly ash residual charcoal were analyzed from the following four aspects: the deviation of the bed temperature in the dense phase zone of the boiler, the differential pressure of the boiler, the pressure drop of the cyclone separator and the NO_x emission. The test results show that the 130 t/h fly ash charcoal residue furnace can achieve stable combustion of gasification charcoal residue when the bed temperature exceeds 850 ℃. At 60% carbon residue, the spread burning boiler operates very stably and has reliable performance. At 80% carbon residue, the spread burning boiler operates stably, and the maximum deviation of bed temperature in dense phase zone exceeds 30 ℃. At 100% residual carbon, the temperature of residual carbon furnace bed fluctuates greatly, so it is necessary to adopt optimized air distribution mode. Properly reducing the furnace differential upper pressure is conducive to improving the overall combustion performance of the residual carbon furnace.The original NO_x emission of fly ash carbon residue furnace is less than 100 mg/m~3 when burning pure carbon residue, and less than 50 mg/m~3 when burning pure coal.
2021 S2 v.27 [Abstract][OnlineView][Download 383K] - HAO Songtao;SONG Changzhong;JIA Xiangru;HUO Xinguang;LI Changying;LIU Shaoqing;DING Yaqian;College of Energy and Power Engineering,Inner Mongolia University of Technology;
In order to study the mixed combustion characteristics of corn straw and coal gangue after different torrefaction temperatures, the proximate analysis, ultimate analysis and SEM analysis were carried out on the torrefactioned samples, and then the mixed combustion characteristics of coal gangue and corn straw at different torrefaction temperatures were analyzed by TG-DSC. Kinetic was analysed.The results show that the use of torrefaction technology makes the pores of corn straw developed, the increase of torrefaction temperature reduces the O/C and H/C of biomass, and increases the degree of carbonization.The higher the torrefaction temperature is, the higher the overall combustion zone moves to the high temperature zone.The lower the weight loss rate is, and the higher the peak temperature and ignition temperature are.The maximum burnout characteristic index and comprehensive combustion index appeares in the mixture of corn stalk and coal gangue at torrefaction temperature of 200 ℃,the maximum heat release reaches at torrefaction temperature of 250 ℃,and the minimum activation energy of the mixture containing corn stalk at torrefaction temperature of 250 ℃is 24.02 kJ/mol. The analysis shows that different torrefaction temperatures has different effects on the combustion of corn straw and coal gangue.
2021 S2 v.27 [Abstract][OnlineView][Download 280K] - TAN Houzhang;LIU Yang;WANG Xuebin;WANG Yibin;YANG Fuxin;XU Tongmo;Department of Thermal Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University;Xi′an Thermal Power Research Institute Co., Ltd.;
Biomass combustion is considered to be "zero-carbon" emission, but the utilization in this way in China is still few due to the effects of fuel price, collecting difficulty, market benefit and so on. Aiming at the abundant biomass resources in Shaanxi Province, in this work, a technology of cofiring biomass pellet in high-efficiency and large-scale coal-fired power plants was proposed. Also the characterisitc of this application of biomass resources with the mode of high efficiency and large scale was analyzed in detail. The technology of biomass briquette cofiring has the advantages of near-zero investment, which would not have any impact on the unit operation stably. Also this cofiring technology could reduce the emissions of NO_x and SO_x. This biomass application mode could achieve the benefits of slow-price collection and transportation, high efficiency and clean utilization. Since 2010,long-term test verification and applications have been carried out in Baoji No.2 power plant, which has good social benefits and the potential of CO_2 reduction. Based on the distribution characteristic of biomass resources and coal-fired power plants in Shaanxi Province, it is suggested that biomass briquette should be co-fired in large capacity coal-fired power plants in Guanzhong area to realize the replacement of coal and reduce CO_2 emission.
2021 S2 v.27 [Abstract][OnlineView][Download 219K] - QIAO Junqiang;LI Guo;LU Haiyun;CHN Energey Shendong Coal Group Co.,Ltd.;National Institute of Clean-and-Low-Carbon Energy;
In order to optimize boiler design, operation and coal selection, thirty coal samples from shendong area were selected for coal quality analysis and coal ash contamination and slagging characteristics analyses. The results show that the coals in this area have high volatile content, low ash content and high calorific value which means they have good ignition and burnout performance. Thus, the coals belong to high-quality power bituminous coal. However, most coals have a high content of alkalis mental, calcium and sulfur in ash, and are prone to produce sulfate aerosols during combustion, which can condense into a viscous inner-white-layer on the wall and increase contamination. Along with the thickening of the slag layer, the minerals in ash particles undergo aluminosilicate reactions at high temperature to form alkali metal aluminosilicates, forming low-temperature eutectic and exaggerating slagging. The thirty coal samples generally have a high tendency of contamination and slagging. In the actual combustion process, attention should be paid to preventing contamination and slagging in the furnace.
2021 S2 v.27 [Abstract][OnlineView][Download 169K] - NIE Xin;WANG Yikun;XIE Haiyan;XIE Beibei;LIU Hui;WEI Xing;ZHOU Lingyu;Xi′an Thermal Power Research Institute Co.,Ltd.;Nuclear Power Institute of China;Xi′an TPRI Boiler & Environmental Protection Engineering Co.,Ltd.;
In order to study the economy of the municipal sludge treated by the pressurized thermal hydrolysis system and then sent to the coal-fired boiler for power generation, this paper taked a power station coupling with sludge pressurized thermal hydrolysis system as an example, the relationship between the temperature of sludge thermal hydrolysis and the moisture content of the dried sludge after treatment was studied. The cost and benefit of sludge treatment in different working conditions of the hydrolysis temperature and sludge moisture content were calculated. Through comprehensive analysis the economy of sludge treatment was obtained. The results show that when the hydrolysis temperature of the sludge treatment system changes from 190 ℃ to 240 ℃,the hydrolysis temperature is 200 ℃,the benefit is the largest. The higher the temperature, the smaller the profit, but the income gap of different temperature conditions is very small. In addition, the lower the moisture content of wet sludge, the smaller the income of wet sludge per ton.
2021 S2 v.27 [Abstract][OnlineView][Download 266K] - HU Gang;LIU Hailong;XING Shiwei;Beijing Huaketonghe Science and Technology Co.,Ltd.;Shenhua Guohua Sanhe Power Plant Co.,Ltd.;
In this paper, the primary gypsum dehydration difficulty and foam increase process occurred in a power plant using recycled water drainage as desulfurization make-up water were taken as the research object, and the particle size distribution and crystal morphology of desulfurization gypsum were analyzed. Combined with the detection results of gypsum electron microscope energy spectrum, the causes of the problems were analyzed in many aspects, and the operation suggestions were put forward. Through the analysis of gypsum particle size distribution, crystal morphology and energy spectrum electron microscope, the main reason of gypsum dehydration difficulty and slurry foaming is that the gypsum particle size is too small, and the fundamental reason is that the reclaimed water quality is unstable.The circulating cooling water is used as process water to add scale and corrosion inhibitor to inhibit gypsum crystallization, and the limestone quality is poor. It is suggested to restore reclaimed water advanced treatment equipment to ensure the stability of service water quality, adjust the scale and corrosion inhibitor types for circulating cooling water upstream of process water, control limestone quality and increase desulfurization wastewater discharge.
2021 S2 v.27 [Abstract][OnlineView][Download 214K] - HU Shan;LIU Jing;LI Weiwei;GU Lixin;Nanjing Branch,Shanghai Clear Science & Technology Co.,Ltd.;
In the dry desulfurization and denitrification system of activated coke, the ammonia injection grille technology directly affects the denitrification efficiency of the desulfurization and denitrification unit. In order to study the ammonia spray grille in the desulfurization and denitrification tower, the CFD numerical simulation results were used as the theoretical basis to optimize the original ammonia spray grille by combining with the engineering operation results. The results show that the optimized vortex type static mixed ammonia spray grille can effectively improve the denitrification efficiency of the unit and can effectively solve the problems of the original ammonia spray grille structure in the project operation.
2021 S2 v.27 [Abstract][OnlineView][Download 168K] - DUAN Shoubao;XIN Shengwei;GU Congyang;DU Jiajun;WANG Hu;XIE Guowei;WU Wanzhu;CFB Technology R&D Center CHN Energy;
The technical scheme for controlling NO_x emissions in a Circulating Fluidized Bed(CFB)boiler was analyzed under low load, and field tests on a 280 t/h CFB boiler was carried out. The research results show that the use of flue gas recirculation(FGR)in the CFB boiler can effectively improve the combustion performance of the boiler and reduce the NO_x emissions of the boiler under low load. At 70% and 50% of the boiler load, FGR can reduce the original NO_x emission concentration by about 25%,and at the same time increase the flue gas temperature at the furnace outlet. Under the boiler load of 70% and 50%,using ammonia water instead of urea as the SNCR reducing agent, the ammonia-to-nitrogen molar ratio(NSR)for achieving ultra-low NO_x emissions is reduced by 0.34 and then 0.69 respectively, which greatly improves the denitrification efficiency. The research results can provide technical reference for the realization of ultra-low NO_x emissions of CFB boilers under low load.
2021 S2 v.27 [Abstract][OnlineView][Download 258K] - GAO Ruyun;WEI Fei;Shanxi Luneng Hequ Power Generation Co., Ltd.;State Power Environmental Protection Research Institute Co., Ltd.;
The W flame boilers are widely used in southwestern, but due to different boiler types, combustion and coal conditions, the NO_x emission concentration of W flame boilers are naturally higher than other types of boilers which usually reaches above 1 000 mg/Nm~3. In order to meet the requirements of ultra-low emission standard for NO_xemission concentration of W-type flame furnace, it is difficult to rely solely on SCR denitrification technology.It was necessary to adopt auxiliary denitrification technology to reduce the operating pressure of SCR denitrification to ensure stable operation of the denitrification system and ammonia escape within reasonable control. The technology and economy of two assistant denitrification technologies to reduce the concentration of NO_x emission from W-type flame furnace were compared and analyzed, which can provide technical reference for the realization of ultra-low emission of denitrification from W-type flame furnace.The selection of specific auxiliary denitrification technology should be based on plant conditions, and comprehensive consideration of unit life, unit load, NO_x concentration, operating time, etc., to determine a reasonable technical route.
2021 S2 v.27 [Abstract][OnlineView][Download 179K] - LIU Bin;WU Xijun;WANG Haitao;China Huaneng Group Clean Energy Technology Research Institute Co.,Ltd.;Liaoning Shencoal Hongyang Thermal Power Co.,Ltd.;
SNCR denitration is widely used in circulating fluidized bed boiler, which reduces NO_x emission, but also brings many problems. In order to make the SNCR more perfect, the experiment research of the key parameters of the spray gun was have been presented. When the mole fraction of NH_3/NO is 1.25-1.50 and the velocity of urea solution is 10-20 m/s, it can ensure a high denitration efficiency while reducing the ammonia escape. Comparing the layout of spray gun, it can be found that spray gun arranging both inside and outside can lead to more uniform distribution of reductant, resulting in high denitration efficiency and low ammonia escape.
2021 S2 v.27 [Abstract][OnlineView][Download 411K] - WANG Yanyan;YUE Chunmei;CHEN Rui;LIU Zhichao;ZHENG Fangdong;Shanghai Minghua Electric Power Science & Technology Co.,Ltd.;
The tests were carried out by the isopropyl alcohol absorption method, Ontario method, cyclone separation method and EPA Method 202 method on the non-conventional pollutants such as SO_3,Hg, PM_(2.5) and condensable particulate matter(CPM) from three coal-fired units to study the emission levels and removal effects of non-conventional pollutants from ultra-low emission coal-fired units. The results show that SO_3 emission concentration is 1.91-2.50 mg/m~3,total removal efficiency is 87.0%-92.9%,among which the removal efficiency of ESP for SO_3 is 24.4%-66.4%,FGD is 65.9%-70.5%,WESP is 52.8%,and flue gas cooler is 38.1%. Hg is mainly emitted in the form of Hg~0,Hg~T emission concentration is 1.06-1.59 μg/m~3,Hg~T removal efficiency is 67.9%-88.7%,where ESP mainly removes Hg~p and Hg~(2+),Hg~T removal efficiency is 24.6%-33.3%,FGD mainly removes Hg~(2+),Hg~T removal efficiency is 52.6%-63.1%,Hg~T removal efficiency of WESP is 59.2%. PM_(2.5) emission concentration is 0.99-1.79 mg/m~3,the total removal efficiency is 99.69%-99.88%,among which the removal efficiency of ESP for PM_(2.5) is 99.00%-99.53%,and the PM_(2.5) removal efficiency from FGD inlet to stack outlet is 68.82%-74.02%. CPM emissions accounted for 53.7%-83.3% of the total TPM,with emission concentrations of 1.65-6.87 mg/m~3,and removal efficiencies of 31.53%-77.45% after flue gas cooling and reheating.
2021 S2 v.27 [Abstract][OnlineView][Download 344K] - SUN Zhipeng;MA Chao;XIE Deyong;DONG Wenqiang;LIU Jintao;China Datang Corporation Science and Technology Research Institute Thermal Power Technology Research Institute;DTP Chao Zhou Power Co.,Ltd.;
Based on the northern rural air source heat pump heating system, the heat load calculation model and air source heat pump heating system model were established by employing TRNSYS. Combining with the operating data of the heating system, the models were verified and the error between simulation results and operation data was acceptable. Combined with the operating data and simulation results, the operating characteristics of the heat pump heating system were analyzed. The results show that poor thermal insulation performance and unreasonable operation mode are the main reasons of high operating cost. Aiming at the existing problems, basing on the load characteristics of rural houses and the heating performance characteristics of air source heat pump, the clean heating system of rural houses was optimized. The results show that the thermal insulation design and reasonable backwater temperature setting can effectively reduce the overall thermal load of the farm house. And air source heat pump coupling energy storage system can effectively utilize the heating period of high energy efficiency ratio of air source heat pump, thus effectively reducing the energy consumption of clean heating of rural houses, where 1 872 yuan per year in heating cost is saved.
2021 S2 v.27 [Abstract][OnlineView][Download 337K] - WU Shiyu;WU Yanli;BAI Jingli;HAO Yanhong;WU Shaohua;CHENG Fangqin;Institute of Resources and Environmental Engineering,Shanxi University;College of Environmental and Resource Sciences,Shanxi University;
The cogeneration systems are facing with waste heat and insufficient heating capacity, which can be effectively alleviated by heat pump technology to recover waste heat from exhaust steam for heat supply. The heating technology of recovering waste heat based on absorption heat pump, ejector heat pump and compression heat pump were systematically analyzed. The research and application progress of above three technologies were summarized, and the corresponding development in the future were proposed. Absorption heat pump is with good economy and low heating efficiency, and the optimization of the absorption cycle and the retrofit of the Co-ah heating system should be considered. Improving the injection coefficient of the ejector is the key to improving the heating efficiency of ejector heat pump. Steam-driven compression heat pump has better primary energy utilization and economy than electric-driven compression heat pump. The development direction of steam-driven compression heat pump in the field of recovering waste heat from exhaust steam is to develop the high condensation, high evaporation, large capacity, large temperature difference and high heating coefficient unit.
2021 S2 v.27 [Abstract][OnlineView][Download 271K] - WANG Qiang;XU Xiangyang;School of Management,China Vniversity of Mining and Technology-Beijing;
The construction of ecological civilization in the Yellow River Area is related to regional socio-economic development and people′s well-being. Most of the modern coal chemical industry is located in the Yellow River Area. To realize the sustainable development of the industry, the analysis of the carrying capacity of coal and water resources, and the environmental carrying capacity of atmosphere and water in the Yellow River Area must be paid attention to.The resource and environmental carrying capacity of Ordos, Baotou, Yulin, Changzhi and Ningdong was analyzed, which were the key areas of modern coal chemical industry, and evaluated the sustainability of the five areas through the comprehensive evaluation method of sustainable development. The result shows that Ordos has obvious advantages in coal resource carrying capacity, atmospheric environment carrying capacity and water environment carrying capacity. Yulin, Baotou and Ningdong are slightly lower than Ordos, and Changzhi has weak development potential among the five cities.
2021 S2 v.27 [Abstract][OnlineView][Download 279K] - CHANG Liang;National Institute of Clean-and-Low Carbon Energy;
In order to control the pollution emissions from the scattered coal for civil use, the paper studied the process conditions and process energy consumption for preparing civilian clean coal from Shenhua YJL coal. Studies have shown that at 15 minutes, the temperature from 550℃ to 700℃,the ash content, volatile matter, and sulfur content in the pyrolysis char of YJL coal meet the quality index requirements of civilfuel coal. The toxic elements in the char at 600 ℃ is analyzed, and content of the toxic elements are all lower than the quality index requirements of civil fuel coal too. The energy consumption of the process is analyzed through Aspen Plus, the systems energy efficiency of the YJL coal is 84.81%. As the moisture content of the raw coal increased from 5% to 24%,the energy efficiency of the system decreased from 85.44% to 83.68%. In the tar recovery unit, when the partial pressure of the tar component in the pyrolysis gas is less than 0.001P_g(pyrolysis gas),increase the amount of wash oil circulation, but the tar output does not increase significantly. As the combustion volume of pyrolysis gas increases from 0 to 60 t/h, the energy consumption of the system increases from 80.20% to 84.68%.
2021 S2 v.27 [Abstract][OnlineView][Download 320K] - WU Zhichao;YAO Yong;LI Shizhu;QI Xi;CHEN Huiling;HUANG Shanshan;JIA Yihai;Guangdong Energy Group Co.,Ltd.;Guangdong Tsingda Tongke Environmental Technology Co.,Ltd.;
High-chlorine fly ash is produced by some coastal power plants in the process of multi-purpose water and waste water recycling. Because of its high chloride ion content, its use is restricted. In this study, high-chlorine fly ash was used as the main raw material to prepare high-chlorine fly ash cementitious materials, which can not only solidify chloride ions, but also provide a solution for the application of high-chlorine fly ash. In this paper, through the mortar strength test, XRF,XRD,SEM,TG and other test methods, the influence of chloride ions on the compressive and flexural strength and microscopic state of high-chlorine fly ash cementitious materials and the exploration of some mechanisms were studied. The results show that when the chloride ion content of the high-chlorine fly ash raw material is about 1%,the strength of the cementitious material reaches the maximum. Continue to increase the chloride ion content to reduce the strength of the cementitious material.The chloride ion reacts in the cementitious material.The formation of Friedel′s salt can improve the initial strength of the cementitious material, and can change the microstructure of the cementitious material, and at the same time make the cementitious material compact.
2021 S2 v.27 [Abstract][OnlineView][Download 445K] - YANG Zhijie;ZHANG De;KANG Dong;YAN Changwang;ZHANG Ju;School of Mining and Technology,Inner Mongolia University of Technology;Key Lab For Green Development of Mineral Resources,Inner Mongolia University of Technology;Engineering Research Center of Inner Mongolia Autonomous Region for Ecological Building Materials and Assembly Structure;
Calcium silicate slag is as a secondary solid waste generated during process of extracting Al_2O_3 from high-alumina fly ash.In order to reveal the hydration mechanism of geopolymer cementitious materials prepared by calcium silicate slag, fly ash and blast-furnace slag, cementitious property experiments of the ternary composite geopolymer were carried out under different fly ash/calcium silicate slagratio in this paper. And thehydrates of geopolymer were analyzed through adopting various analytical methods. The results show that the geopolymer is a binary composite cementitious system composed of C(N)—A—S—H and C—S—H. And there are two main hydration mechanisms. On the one hand, the β-dicalcium silicate in calcium silicate hydrates to generate flake-like C—S—H and Ca(OH)_2. On the other hand, the generated Ca(OH)_2 forms the alkaline environment together with the added sodium silicate solution. And under the polarization of OH~-,the Si—O bond and Al—O bond with high degree of polymerization in blast-furnace slag and fly ash are repolymerized with the participation of Ca~(2+) and Na~+ to form C(N)—A—S—H with different micromorphology, and containing—Si—O—Si(Al)— and —Si(Al)—OH groups. At the same time, because the glass phase is thermodynamically metastable, hydration reaction is more likely to occur than crystalline phase. As a result, not only the unreacted spherical-like mullite phase and columnar-like quartz phase but also the layer-like wairakite phase appeared in the 7 days hydrates with increase of fly ash/calcium silicate slag ratio. However, with the extension of curing time, the mullite phase gradually hydrate and form worm-like tetranatrolite phase at 28 days. And when fly ash/calcium silicate slag ratio is more than 0.45,the strip-like beidellite phase is formed between tetranatrolite phase and mullite phase.
2021 S2 v.27 [Abstract][OnlineView][Download 590K] - ZHU Peiyu;CHN Energy Estates Management Co.,Ltd.;
Coal fly ash is an industrial by-product derived from coal combustion in thermal power plants, and the current annual production of coal fly ash(CFA) is more than 600 million tons in China. The potential applications of CFA was reviewed, and the present situation of industrialization was analyzed. CFA can be used as zeolite synthesis, catalyst supports, extraction of Al_2O_3,SiO_2 and Ga_2O_3,glass-ceramic, high performance building materials, organic polymer composite with high filling of CFA. It is also found that CFA has good potential for use in the construction industry. By the development of the CFA series products, the coal industry will truly realize green, energy-saving and environmentally sustainable development.
2021 S2 v.27 [Abstract][OnlineView][Download 368K] - YAO Yong;WU Zhichao;LI Shizhu;ZHOU Yanling;QI Xi;WANG Chuanxing;JIA Yihai;Guangdong Energy Group Co.,Ltd.;Guangdong Tsingda Tongke Environmental Technology Co.,Ltd.;
The high-chlorine fly ash cementitious material was prepared by mechanical ball milling process. The best formula of the high-chlorine fly ash cementitious material was determined by orthogonal experiment method. The hydration product of high-chlorine fly ash cementitious material was characterized by X-ray diffraction analysis(XRD),and Scanning Electron Microscope(SEM).The effect of the compound utilization of high-chlorine fly ash cementitious material and cement on the strength of standard mortar was studied in detail. The chloride ion curing ability of high-chlorine fly ash cementitious material was analyzed. The results show that the best formula of high-chlorine fly ash cementitious material is that 100 parts of high-chlorine fly ash, 60 parts of slag powder, 20 parts of steel slag, 20 parts of desulfurized gypsum and 4 parts of sulfoaluminate cement. As the curing time changes, the phase composition and microscopic morphology of the hydration product will change, which will affect the strength of the cementitious material. The experiment used the high-chlorine fly ash cementitious material prepared with the best formula to prepare the standard mortar test block. The 3 d compressive strength is 15.5 MPa. The 28 d compressive strength is 50.0 MPa. It can be seen that the early strength is low. The high-chlorine fly ash cementitious material can be used in combination with ordinary Portland cement. The best addition amount of cement is 40%-80%. In this way, the early and late strength can be improved. At the same time, the high-chlorine fly ash cementitious material can cure the chloride ions in the fly ash, and the chloride ion curing rate is as high as 92%.
2021 S2 v.27 [Abstract][OnlineView][Download 186K] - LIU Wenxin;Binhai Goldfield Mining Engineering Technology(Beijing)Co.,Ltd.;
Fengfeng mining area in Hebei Province is one of the earliest coal mining areas in China, about 20 coal gangue mountains are formed in the mining area. These gangue hills have seriously polluted the environment due to spontaneous combustion and weathering. Fengfeng Group had carried out long-term treatment and achieved some results. Some feasible suggestions and treatment methods were put forward based on the characteristics of coal gangue in Fengfeng mine area.
2021 S2 v.27 [Abstract][OnlineView][Download 149K] - PAN Yuejun;CHN Energy Shendong Coal Preparation Center;
As Shendong coal group increases the rate of raw coal washing, the output of raw coal, as a by-product of coal preparation-coal slurry output also increases. At present, the main way of coal slime treatment in Shendong Coal Group coal preparation plant is to mix the coal slime with the products after coal preparation, which reduces the quality of the products and the effect of coal washing. This method can be used if the coal slurry yield is low or the fine coal is not washed. But with the increase of the coal slurry yield, the problem of coal slurry disposal becomes more and more serious. This paper first introduced the comprehensive utilization of coal slime in Shendong, and then introduced the application of coal slime pulping, coal slime molding, coal slime low temperature dry distillation and coal slime gasification.It is hoped to provide reference for comprehensive utilization of coal slime in coal industry in China.
2021 S2 v.27 [Abstract][OnlineView][Download 117K] - ZHU Yujie;HAN Yuan;CHEN Yuanyuan;WU Yu;TIAN Wentao;Inner Mongolia Power(Group)Co.,Ltd., Inner Mongolia Power Research Institute Branch;
The environmental protection major of the Inner Mongolia Electric Power Technology Supervision and Inspection Center has conducted technical supervision during the production period, technical supervision during the infrastructure construction period, grid-connected supervision, overhaul supervision of units, special supervision, mutual supervision and inspection, and supervision and evaluation to more than 60 companies in the central and western regions of the Inner Mongolia Autonomous Region. Coal-fired power plants continue to carry out in-depth environmental protection technical supervision work. In order to effectively alleviate the environmental protection pressure of coal-fired power plants in the Inner Mongolia Autonomous Region under the situation of building a new power system, based on the existing data and cases of environmental protection technology supervision, the analysis of coal-fired power plants′ supervision and management, environmental protection facilities, and solid waste integration utilize the outstanding problems in aspects such as utilization were analyzed, and made predictions on the development direction of environmental protection technology supervision of coal-fired power plants under the new situation. The conclusion shows that the three key points to improve the quality of environmental protection technical supervision are: the supervision execution unit should actively take the lead in building an online technical supervision platform, the coal-fired power plant should strengthen the management of the Continuous Emission Monitoning System(CEMS) operation and maintenance unit, and the coal-fired power plant management should deepen the importance of technical supervision.
2021 S2 v.27 [Abstract][OnlineView][Download 155K] - HAO Songtao;SONG Changzhong;JIA Xiangru;HUO Xinguang;LI Yuanyuan;LI Changying;LEI Mingzhuang;College of Energy and Power Engineering,Inner Mongolia University of Technology;
In order to study the mixed combustion characteristics of corn straw and coal gangue at different torrefaction temperatures, thermogravimetric analyze was used to analyze the combustion of a single substance, followed by the mixed combustion analysis of biochar and coal gangue. Finally, 200 ℃ torrefaction biomass and coal gangue were selected for combustion experiments with different mixing ratios, and dynamic analysis and synergy analysis were carried out. For single biomass combustion, the combustion characteristic index of corn straw with torrefaction temperature of 200 ℃ is better than that with torrefaction temperature of 250 ℃ and 300 ℃.When the ratio of coal gangue to corn straw is 8∶2,the mixed combustion of coal gangue and 200 ℃ torrefaction products has the maximum weight loss rate, flammability index and comprehensive combustion characteristic index.Comparing the mixtures with different proportions, when the combustion temperature exceeds 497 ℃,the conversion of the mixture with a mixture ratio of 8∶2 is greater than that of other mixtures.In the temperature range of 258-383 ℃,the mixing ratio is 9∶1,and the activation energy of the mixture is the lowest, which is 39.88 kJ/mol.In the temperature range of 384-435 ℃,the mixture ratio of 7∶3 has the lowest activation energy, which is 12.37 kJ/mol.In the temperature range of 436-600 ℃,the activation energy of the mixture with mixing ratio of 6∶4 is the lowest, which is 33.63 kJ/mol. Comparing the synergistic effects of mixtures with different ratios, when the mixing ratio is 8∶2,the combustion promotion effect of biomass is higher than that of other ratios.
2021 S2 v.27 [Abstract][OnlineView][Download 275K] - LU Jianwen;WANG Hong;TIAN Kai;DAI Dongming;ZHAO Nan;DING Yang;Information Service Center of Baotou Iron & Steel (Group) Co.,LTD.;Beijing Zhongyuantong Science and Technology Co., LTD.;
Aiming at the state detection of the switch and the ventilation cover of the coke oven gas heating equipment, an explosion-proof intelligent hoisting orbital robot inspection system based on machine vision technology that can automatically inspect and collect data was proposed.This system is based on 3 D point cloud, binocular vision, and OpenCV vision library for recognition and detection of the heating equipment status of the focusing furnace. The line laser transmitter is used to scan the object under the driving of the motion mechanism, while the binocular stereocamera is used for image shooting, and the generated depth data is transmitted to the industrial control processor. The industrial control processor uses the triangulation principle to calculate the disparity, quickly process the image data, reconstruct and output the three-dimensional point cloud model, and then combine with the Camshift tracking algorithm to quickly and effectively identify objects in motion. At the same time, the robot vision technology is used to intelligently analyze the status of equipment and personnel behavior, and can collect environmental data such as carbon monoxide and temperature in the work area. Realize the intelligent comprehensive monitoring and management of equipment, personnel and environment.
2021 S2 v.27 [Abstract][OnlineView][Download 287K] - LI Hairong;WANG Fengtao;YANG Shuo;LI Xiuxia;GONG Xiaojie;Rundian Energy Science and Technology Co.,Ltd.;
Aiming at the problems of pipe valve internal leakage and blockage in urea hydrolysate gas system for boiler flue gas denitration in thermal power plant, the system sediments were detected by X-ray spectrum, infrared spectrum, electron microscope energy spectrum, capacity analysis and other methods. Combined with the on-site operation, the corrosion and scaling mechanism of the product gas system was analyzed, and the cause of the problem was confirmed. The results show that the product gas temperature is lower than the water dew point in some periods, and the local condensation of the system causes metal corrosion and scaling related reactions, resulting in the problems of internal leakage and blockage of pipe valves. The main components of the sediment are corrosion products such as FeCO_3,organic compounds with amide groups. The content of ammonium salts such as ammonium carbamate is very low.
2021 S2 v.27 [Abstract][OnlineView][Download 186K] - HUANG Yuxin;WANG Dan;XIONG Xianyue;ZHANG Songsong;ZHU Yanzhen;School of Petroleum Engineering,Guangdong University of Petrochemical Technology;School of Cvil Engineering and Architecture,Baise College;Petro China Coal Bed Methane Co.,Ltd.;
Based on the geological conditions of coal reservoirs in different areas, it is the key to select the engineering technology matching with the main geological conditions to improve the single well production and scale development benefit of coalbed methane. Taking the shallow coalbed methane in the Eastern of Linfen Block as an example, based on a large number of field drilling, logging, fracturing, drainage and other engineering data and experimental data, the dominant geological factors affecting the development effect of coalbed methane in the study area were optimized, the advantages and disadvantages of the drilling and completion technology and the applicability of the practice in this area were summarized, and the development technology suitable for the geological characteristics of the study area was optimized. The research results show that the main geological factors affecting the effect of shallow CBM development technology in Eastern Linfen Block are coal structure, hydrogeological conditions and CBM development dynamic conditions.For the medium high rank and low permeability coal reservoir with similar geological characteristics in Eastern Linfen Block, the combination of horizontal well and cluster well is more efficient.
2021 S2 v.27 [Abstract][OnlineView][Download 147K] - GUO Chengyu;CUI Guanghui;FENG Huawei;Sinoma Geological Engineering Exploration and Research Institute Co.,Ltd.;Zhong Sheng Environmental Technology Development Co.,Ltd.;
Coal bed methane(CBM)development is different from conventional natural gas, tight gas and shale gas extraction mechanisms, and the environmental pollution caused by them is very different, especially the treatment and discharge of produced water. The small well spacing and dense well network of domestic CBM development, coupled with the fact that most of the wells are located in hilly areas, make it a challenge to collect the produced water. Through the study on the characteristics of water quality and quantity of output water in the main coalbed methane mining areas in China and the law of change, it is found that the water quality and quantity of output water vary greatly. According to the characteristics of water quality and quantity of output water in different regions and the discharge standards implemented in each region, different collection schemes and treatment processes should be adopted. The key reasons limiting the reuse of output water were analyzed, and the prospect of comprehensive utilization of output water was presented.
2021 S2 v.27 [Abstract][OnlineView][Download 211K] - LI Yuanhao;ZHANG Huadong;LIU Yi;TAN Zengqiang;ZHANG Ruifeng;DU Wenzhe;Xi′an West Boiler Environmental Protection Engineering Co.,Ltd.;Huaneng Yangtze River Environmental Technology Co.,Ltd.;Huaneng Shandong Power Generation Co.,Ltd.;Shaanxi Gongdafutian Engineering Technology Co.,Ltd.;
The noise source of the dumper room in thermal power plant is mainly low and medium frequency. The sound energy attenuation is slow, the penetration is strong, and the transmission distance is long, so it is difficult to control the noise. For a thermal power plant dumper room working sound source noise test data, the noise impact model of the plant boundary was established by using the spectrum analysis software, and the main noise sources and control schemes were determined. The noise can be reduced by about 15 dB(a)after the sound barrier of reasonable size is arranged on the north side of the original train track. The noise contribution value of the impact noise generated by the train track car outside the dumper to the northwest plant boundary is reduced, which can meet the requirements of class II standard of "emission standard of environmental noise at boundary of industrial enterprises"(GB 12348—2008),that is, the noise in the daytime is ≤60 dB(A),and the noise at night is ≤50 dB(A). By analyzing the environmental impact of complex sound sources such as the thermal power plant dumper room, a clear and comprehensive judgment can be made to provide guidance for the selection of reasonable and efficient noise control technologies.
2021 S2 v.27 [Abstract][OnlineView][Download 340K] - NI Gang;CHN Energy General Dispatch Office of Shendong Coal Group;
The purpose of the construction of the Intelligent Mine Control Center in Cuncaota No. 2 Mine is to improve the safety production management level and technical capacity, and to provide technical support for the safety production decision-making of enterprises, the final realization of modern, digital and intelligent safety mine. The paper first introduced the functions and goals of the intelligent mine, and then analyzed the supporting facilities of the intelligent dispatch room one by one, including large-screen display system, intelligent audio system, video conference system, paperless office system, network coverage system and central control system. The use of mine intelligent dispatching can improve the efficiency of command and dispatch decision making, enhance the intuitiveness and operability of mine information display, and further through the intelligent meeting system, accelerate the speed of information exchange, and improve the efficiency of handling affairs, it reduces the cost of administration and provides a new reference for the construction of intelligent mine.
2021 S2 v.27 [Abstract][OnlineView][Download 121K] 下载本期数据