- DONG Kun;TAN Houzhang;XU Xinwei;WANG Xuebin;LI Yongtian;Shenhua Guohua( Beijing) Electric Power Research Institute Co.,Ltd.;School of Environmental Science and Technology,Tianjin University;School of Energy and Power Engineering,Xi'an Jiaotong University;
As an important thermal power equipment in industrial production,Industrial boilers have lower thermal efficiency and higher emissions than utility boilers,which comes from the various coal-type and the low parameter of industrial boiler.The advantages of typical industrial boilers such as chain grate boilers,CFB boilers,and pulverized-coal boilers were summarized.The main reasons which leaded to the low efficiency and high emissions of industrial boilers was applied.It is proposed to arrange high-quality bituminous coal grinding station in the country and adopt centralized powder feeding method for the supply for industrial boilers.A new type of industrial pulverizedcoal De-NOxburner is designed,which including the flue gas recirculation,and air classification technology. By using this burner and SNCR technology,the NO_x emissions can be controlled below 100 mg/m~3 with 90% boiler efficiency.
2019 S2 v.25 [Abstract][OnlineView][Download 132K] - ZHANG Yun;YANG Qianpeng;Shaanxi Coal Chemical Industry Technology ResearchInstitute Co.,Ltd.;
Based on the gradual development of new coal chemical technology,coal gasification technology has the characteristics of clean and efficient utilization of coal resources.The main classification,development and application status of coal gasification technology was introduced.The problems that still exist in currentcoal gasification technology was pointed out,and the suggestions on the development direction of coal gasification technology were put forward.The entrained flow bed is the most clean and efficient coal gasification bed type,wide range of coal species adaptation,high gasification efficiency and low oxygen consumption,but it needs to be improved in the gasification capacity of a single furnace and operation cycle.GSP pulverized coal gasification technology of entrained flow bed has many advantages such as low energy consumption,suitable composition of synthetic gas,simple process and operation,etc.It has a strong technology and application foundation in China and will be the main development direction of coal chemical gasification technology.In the future,entrained flow gasification technology with strong adaptation of clean and efficient coal should be researched to optimize the process equipment,improve the process control,expand the production scale,efficiently clean the energy conversion,and resource-based pollution treatment to solve the serious problems of energy shortage and ecological environment imbalance,so as to achieve the long-term development of coal gasification process.
2019 S2 v.25 [Abstract][OnlineView][Download 158K] - LIU Kun;SONG Changzhong;ZHANG Bowen;GONG Zhen;LIU Yan;School of Energy and Power Engineering,Inner Mongolia University of Technology;
In order to improve the comprehensive combustion efficiency of the steam coal,there is less waste of resources.Combustion experiments of petroleum coke and coal gangue were carried out with thermogravimetric analyzer at different proportions and heating rates.Combustion characteristic curves( TG,DTG,DTA) and combustion characteristic parameters of the blended samples were analyzed by thermogravimetric analysis and thermogravimetric analysis.The optimum combustion ratio and combustion characteristic parameters of the blended samples were explored.Temperature rate.Experiments show that the combustion performance of petroleum coke and coal gangue is the best when the mixture ratio of petroleum coke and coal gangue is 4 ∶ 1 in air atmosphere and the flow rate is 30 m L/min,and the combustion characteristics of petroleum coke and coal gangue are better than that of single sample.The burning effect of the mixed fuel is the best.The exothermic area of 15 ℃/min and 25 ℃/min is greater than 20 ℃/min,which indicates that the heating rate of 20 ℃/min is not conducive to exothermic.
2019 S2 v.25 [Abstract][OnlineView][Download 1049K] - LIU Congyun;GAI Qingqing;LANG Shuang;MA Lin'ge;ZHANG Zhonghua;ZHANG Cuiqing;LI Yonglong;Analysis and Characterizations Center,National Institute of Clean-and-Low-Carbon Energy;
In order to optimize the process parameter setting of the solvent recovery unit and to improve the effective utilization of lignite,a headspace GC-MS method was established to analyze the solvent residue in lignite after extraction of montan wax.The analytes were separated on a DB-5 MS capillary column with temperature programming and detected by MS chromatography with selected ion monitoring mode.The equilibrium temperature,equilibrium time,injection time and pressurization time were optimized at 100 ℃,45 min,1.0 min and0.5 min,respectively.The linearity results are very good for toluene and the novel extractant in the concentration ranges of 8 to 45 mg/kg with coefficient R2 of 0.999 5 and 0.999 8,respectively.The precisions( RSD values) were less than 10% for both extractants.This method was employed to determine solvent residues in lignite,results showed that the concentration of toluene and novel extractant were all below the LOD value( 3 mg/kg),The results could provide a reference for process design of solvent recovery and the effective use of lignite.
2019 S2 v.25 [Abstract][OnlineView][Download 656K] - YANG Chun;XU Yinglu;CHEN Hui;LIU Siwei;ZHAO Qing;LIU Jiang;Dongfang Electric Co.,Ltd.;
When the fixed bed is used to gasify the orchid charcoal,the massive orchid charcoal must be used.In this process,the conversion rate of the coal and gasification intensity are low,and the phenol containing wastewater which is difficult to treat will be produced.In this paper,the feasibility of semi-coke water slurry( SCWS) gasification regarding coal quality,slurry properties,semi-coke reactivity,and gasification process simulation were studied.The slurry properties also fulfill the gasification requirements,which are concentration of the prepared SCWS with approximately 61.5%,viscosity lay within the range of 300-1 100 m Pa·s,the additive amount with 0.2%-0.6%.Thermogravimetric analysis show that the semi-coke reactes completely at 1 200 ℃ with good reactivity under optimum conditions. The ASPEN PLUS software simulation gasification test show that better gas composition with 50.4% CO and 24.2% H_2,and carbon conversion of 94.1% could be obtained through SCWS gasification.
2019 S2 v.25 [Abstract][OnlineView][Download 324K] - LIANG Xuemei;ZHANG Angui;LIU Suli;AN Liangcheng;Ningxia Coal Industry Co.,Ltd.,China Energy Group;
The production process and product characteristics of coal direct and indirect liquefaction diesel were introduced.The difference and the cause were discussed with the analysis of hydrocarbongroups and physico-chemical properties.The properties of the blending diesel were analyzed and compared with the targets of China Ⅵof the Diesel Oil( NO.-10).The density of the blending diesel satisfies linear additivity,and the proportion of the blending diesel can be calculated according to the target value.The kinematic viscosity of the blend diesel increases with the increase of the mass fraction of the indirect liquefaction diesel,and the range of the increase depends on the kinematic viscosity of the two materials.The setting point and cold filter point of the blended diesel fuel can be adjusted from-50-3 ℃ according to the blending ratio to meet the requirements of different types of diesel fuel in VI standard.It was found that the blending diesel oil had good sensitivity to the antiwear additive and reduced the wear mark diameter of the blend diesel oil by using fatty acid type and fatty acid ester type antiwear additives with different contents from 0 to 250 mg/kg respectively.The results show that the two types of diesel have complement advantages with each other,the blending diesel has lower sulfur and aromatic hydrocarbon and good sensibility to the lubricant.
2019 S2 v.25 [Abstract][OnlineView][Download 2068K] - YUAN Weijun;WANG Hui;HAN Mingru;YANG Zheng;Tangshan Keyuan Environmental Protection Technology & Equipment Co.,Ltd.;
In order to explore the coal-based gas fuel which is suitable as the supplementary gas source of conventional natural gas,the carbon emission intensity of cold gas and hot gas of generator was calculated from the life cycle point of view.The CO_2 emission intensity of production,transportation and terminal consumption was compared with that of coal-based natural gas.The results show that the total emission intensity of cold gas carbon is 177.06 g/MJ and that of hot gas carbon is 144.68 g/MJ.Considering the CO_2 emission of hot gas combustion flue gas in desulfurization and denitration process,the emission intensity of cold gas and hot gas carbon should be basically the same.It is an effective way to reduce the total intensity of carbon emission in the whole life cycle of producer gas by optimizing the process route of gas station and reducing the CO_2 emission generated by power consumption of gas station equipment.In terms of production,transportation and terminal consumption,the total emission intensity of CO_2 from coal-fired natural gas is 169. 91 g/MJ,which is about 1. 3 times of that of producer gas.Producer gas is more suitable as a supplementary gas source for conventional natural gas.
2019 S2 v.25 [Abstract][OnlineView][Download 402K] - SUN Yunguo;SONG Xiaona;Qingdao Clear Environmental Protection Co.,Ltd.;
The new-skilled coal water slurry circulating fluidized technology,of which the fuel is the cleaning coal water slurry( CWS).This new technology is realized by reconstructing fluidization station,as a result,we can get non-pollution fuel translation before the boil,the reduction of pollution after the boil,the higher thermal efficiency,the lower fuel consumption and the reduction of carbon emission.This kind of CWS can be mixed with polluted mud in order to dispose the polluted mud.Combined with productive practice,the characteristics of traveling-grate boiler and coal-fired circulating fluidized bed boiler are compared.As a result,the advantage of this new technology is obvious,especially in dealing with polluted mud,the new technology is irreplaceable.
2019 S2 v.25 [Abstract][OnlineView][Download 99K] - SONG Chunyan;China Coal Research Institute Company of Energy Conservation;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;
The traditional layer-fired boiler technology has problems of low efficiency and high pollution.With the continuous improvement of energy efficiency and environmental protection performance of small and medium-sized coal-fired boilers in China,the layer-fired boiler technology and its products in use are in urgent need of transformation and replacement.Efficient pulverized coal fired boiler system has a far superior to the traditional layer combustion boiler technology advantages,this article selects 4×58 MW have been put into operation in layer combustion boiler,boiler body transformation for pulverized coal fired boiler technical route,the transformation of the difficulty,quantities,implementation period,investment and is expected to achieve the design of the modified boiler indicators,draw a layer combustion boiler to pulverized coal fired boiler can implementation scope and standards.
2019 S2 v.25 [Abstract][OnlineView][Download 1690K] - YI Changtao;XIN Shengwei;WANG Hu;SUN Guowen;Shenhua Guoneng Group Co.,Ltd.;Shenhua Group CFB Technology R & D Center;
With the introduction of ultra-low emission environmental protection policies in national and local coal-fired power plants,ultralow emission modification of coal-fired power plants is required to be carried out in an all-round way.Research on the demonstration and key technology of the technical route for ultra-low emission modification of the 2×300 MW subcritical CFB boiler unit was carried out.The power plant adoptd the technical route of desulphurization in furnace and low-nitrogen combustion in furnace,SNCR outside furnace and semi-dry desulphurization and dust removal to realize ultra-low emission,and the investment and operation economy is good.The initial investment is less than that of wet desulfurization process,which can save 27 million yuan.The comprehensive annual cost is 1.5-3.0 million yuan per year lower than that of wet desulfurization process,and it is more suitable for the future development trend of environmental protection.The semi-dry desulphurization and dust removal system outside the furnace can further improve the operation economy of the boiler by setting pre-electric dust removal,optimizing the pressure margin of the induced draft fan,and adopting the coordinated desulphurization operation mode inside and outside the furnace.The ratio of desulfuration calcium to sulfur outside the furnace can be reduced by 0.4-0.7 by setting a pre esp.
2019 S2 v.25 [Abstract][OnlineView][Download 329K] - LIU Zhichao;TAO Leixing;YUE Chunmei;CHEN Rui;LU Junchao;WANG Yanyan;ZHENG Fangdong;WAN Di;Shanghai Minghua Electric Power Science & Technology Co.,Ltd.;
The emission reduction effects of conventional pollutants such as SO_2,NOxand particulate matter,as well as non-conventional pollutants such as PM_(2.5),SO_3,Hg and slurry droplets before and after the ultra-low emission transformation of the unit were evaluated with the real-time monitoring results of the CEMS in the past six months and the monitoring results issued by the national authoritative monitoring department in a coal-fired power plants with ultra-low emission technologies,and the local pollution caused by the " gypsum rain" phenomenon was evaluated.The results show that SO_2,NO_x and PM emission concentrations decrease by 52.3%,30.2% and 65.9%,and the emission rate decrease by 49. 6%,25. 4% and 62. 3%. PM_(2.5),SO_3,slurry droplets concentration decrease by 86.3%,85% and 88%,there was no gypsum rain.The simulation results show that the contribution of ambient air SO_2,NO_x and PM_(10) in the surrounding area are significantly reduced after transformation.The improvement effect of PM_(10) and SO_2 is relatively obvious,which effectively improves the negative impact of power plant emissions on the surrounding environment.
2019 S2 v.25 [Abstract][OnlineView][Download 2401K] - LI Zhenqiang;Shenhua Shendong Power Chongqing Wanzhou Power Co.,Ltd.;
There is a large amount of SO_2 in the flue gas produced by coal-fired power plants. At present,wet desulfurization process is widely used to treat flue gas in China.The high salt content and high corrosiveness of desulfurization wastewater affect its safety and stability.The traditional treatment process of desulfurized wastewater and its disadvantages were analysed,and principle,advantages and disadvantages of " membrane salt separation + MVR crystallization" process was studied which was adopted by a million ultra supercritical coalfired power generation unit to realize zero discharge of desulfurized wastewater in the plant area.At last its application effect was analysed.The results show that the desulfurization wastewater of this power plant has high salt content and high hardness ion.First,the desulfurization wastewater enters the pre sedimentation tank to remove the suspended solids,and then enters the buffer tank for water quality regulation.Then,most of the hardness ions will be removed in " primary reaction tank( used existing triple tank) →primary clarifier→secondary reaction tank → secondary clarifier( used existing clarifier) ". The concentrated nanofiltration water is returned to the primary dosing clarification unit for treatment,and the effluent from the clarifier enters the subsequent " filtration ion exchange decarbonization" process section to further remove the residual suspended solids,hardness and alkalinity.In the concentration process of desulfurization wastewater treatment,salt separation technology is selected to produce industrial pure salt with economic value instead of industrial waste salt,and finally the route of " nanofiltration + reverse osmosis" membrane method is selected.By comparing the economy,technology,feasibility and temperature of MVR technology and multi effect evaporation technology,MVR crystallization technology is selected to further evaporate and concentrate in the crystallizer and recover Na Cl crystal salt.The dried crystal salt enters the packaging machine,and the quality of crystal salt meets the first level standard of refined industrial salt( purity≥98.5%,moisture content<0.5%).The zero discharge project of desulfurization wastewater in a million coal-fired power plant realizes zero discharge of desulfurization wastewater.The TDS concentration of final output of high-quality reuse water is less than 50 mg/L,and Cl-concentration less than 20 mg/L is nearly 20 m~3/h.Reuse water providing for plant is 64 thousand per year,and the final output of high-purity crystal salt is nearly 1 t/h.The degree of automation is high,and the full process control of desulfurization wastewater is integrated into the DCS system of the whole plant.
2019 S2 v.25 [Abstract][OnlineView][Download 442K] - JIANG Yongtao;XIE Fan;LI Guoli;LYU Jiang;XU Hongjun;China National Heavy Machinery Research Institute Co.,Ltd.;
In order to solve the problems of large area,low efficiency,high energy consumption and easy blockage of the desulfurization tower which was used in H_2S removal from gas process.The rotating packed bed was used to replace the desulfurization tower.Systematic research on rotating packed bed and two kinds of structures are designed to meet the requirements of different working conditions.This type of rotating packed bed adopts structured packing and modular design,and has the advantages of stable operation,high efficiency,small volume,low energy consumption,large operation flexibility and easy maintenance. This type of rotating packed bed provides a new solution for gas desulfurization
2019 S2 v.25 [Abstract][OnlineView][Download 1247K] - XU Yingjie;GAO Jing;FANG Yuan;Coal Preparation Center of Ningxia Coal Co.,Ltd.,China National Energy Group;
Aiming at the phenomenon that Ф1.5 mm coal activated carbon is easily to float on the water,according to the experimental and the technical index detection of the products,the reasons about the floating and the influencing factors of floating quantity were analyzed.The concrete suggestions was put forward for adjust production process and strengthen production control.It can be reduced the floating rate of activated carbon in water.
2019 S2 v.25 [Abstract][OnlineView][Download 617K] - DONG Kun;GAO Zeng;ZHANG Wanlin;HU Zhenguang;ZHAO Haijun;HAN Binqiao;Shenhua Guohua( Beijing) Electric Power Research Institute Co.,Ltd.;School of Environmental Science and Technology,Tianjin University;
In order to improve the reliability of power generation equipment and ensure the safe,stable,economic and environmental protection operation of power generation enterprises,source,development of technical supervision and fuel supervision was expounded. Development of fuel technical supervision of Guohua( Beijing) Electric Power Research Institute was discussed,current situation and development of fuel technical supervision in 2019 was analyzed.Guohua( Beijing) Electric Power Research Institute has made some achievements in equipment management,coal yard management,sampling and sample preparation management,coal test management,coal sample storage management,personnel training and evidence collection,etc.since the implementation of fuel technical supervision work of national energy group.However,it is still necessary to further strengthen the supervision and management of fuel technology,promote " refined fuel management" and improve the overall fuel management business level.In the next step,statistical analysis of fuel monitoring indicators,the evaluation of fuel acquisition,the strengthening of fuel technology management,the improvement of fuel management standardization and information construction,the support of fuel intelligent transformation,and the feasibility study of the construction of coal laboratory will be studied.
2019 S2 v.25 [Abstract][OnlineView][Download 116K] - GE Ming;SUN Junwei;DAI Weibao;CHEN Guoqing;CAI Pei;WANG Xiujun;GE Rongcun;ZHANG Qiang;HE Lucan;Key Laboratory for Clean and Efficient Coal-fired Power Generation and Pollution control,GuoDian Science and Technology Research Institute;
Experimental studies on the direct blowing pulverizing system for ZGM95K-Ⅱ medium-speed mill had been carried out by using AKOMA pulverized coal sampling system. The influence of dynamic separator frequency,ventilation quantity,loading force and coal supply quantity on coal fineness and coal powder apportioning uniformity had been investigated with control variable method.The optimum frequency of the dynamic separator was given by synthesizing the requirement of pulverized coal fineness and the power consumption of coal mill.It was found that with the decrease of the loading force,the distribution of pulverized coal mass in the pulverized coal tube tends to decrease,while the fineness of pulverized coal do not change obviously.The optimum value of loading force was given by experiment.The proportional relation between coal powder apportioning uniformity and wind velocity do not change with ventilation quantity and coal supply quantity.
2019 S2 v.25 [Abstract][OnlineView][Download 1427K] - GUO Guilong;DADI Engineering Development Group;
In order to solve the gangue disposal problem caused by the moving sieve jig in Ganhe coal mine,the intelligent dry separator( TDS) replaces for the moving sieve jig.The modification result show that the raw gangue disposal system can run continually and reduce the labor intensity,and also raise the separation efficiency and economic benefits of enterprise.
2019 S2 v.25 [Abstract][OnlineView][Download 936K] - LI Dong;ZHANG Xuemei;HAO Jingyuan;MA Qinghua;Energy & Chemical Engineering Research Center,Xi'an Siyuan University;
The unconventional isotherm adsorption data( only three pressure points 1.0 MPA,3.0 MPA and 5.0 MPa) at four temperatures( 20,30,40 and 50 ℃) of four different ranks of coal( gas coal,coking coal,lean coal and anthracite) were directly processed by temperature-pressure-adsorption equation.The relative average error between the measured and calculated adsorption values of four kinds of coals ranged from 4.01% to 4.96%.At the same depth of 800 m,the calculated absorption of coal increases logarithmically with the maximum reflectivity of vitrinite increasing( coal rank rising). Downwards to the depth of 3 500 m,the calculated adsorption capacity of high ranker coal is larger than that of lower rank coal,namely anthracite > lean coal > coking coal > gas coal,and anthracite has appeared the coalbed methane adsorption maximum,in depth between 2 500 m to 2 600 m.The unit equal adsorption enthalpy of coal is increased logarithmically with the maximum reflectivity of vitrinite increasing.
2019 S2 v.25 [Abstract][OnlineView][Download 1170K] - XING Liren;CNOOC Research Institute Co.,Ltd.;
In order to recognize the influence of coal structure on coalbed methane exploitation,the coal structure identification and division are carried outbased on the logging information of X block.And the division result is compared with fracturing effect and gas production.It turned out that,the hole diameter of the original structural coal and the fragmented coal is between 20 and 35 centimeters,and the separation degree of the deep and shallow lateral resistivity is mainly below 40%. The fracturing effect is better when the ratio of the original structural coal and the fragmented coal is above 70%,and the type of fracturing curve is mainly stable.The hole diameter of the broken coal is mainly above 35 centimeters,and the separation degree of resistivity is above 55%.The curve type is mainly high-pressure stable when the ratio of the broken coal is above 50%,and the fracturing effect is bad.In the plane,the ratio of the original structural coal and the fragmented coal is higher in the middle and north and lower in the northwest and southwest.In the area where the original structural coal and the fragmented coal is mainly developed,the gas production is high.The ratio of broken coal has a certain negative correlation with gas production.In the western part of the block,the ratio of the broken coal is high,and the gas production is low.The gas production increases as the ratio of the broken coal decreases.
2019 S2 v.25 [Abstract][OnlineView][Download 6922K] - QIN Shaofeng;China United Coalbed Methane Co.,Ltd.;
Aiming at the problem of low gas production in the CBM wells in the block of Peizhuangbei,the analysis of the existing"moderate pressure drainage and early gas production"in the drainage stage is analyzed.The problem is that the reason for the low gas production in this block is the reason that the casing rolling time is short after initial gas seepage and the amount of water discharged from the formation is small,and the drainage work method of"long casing pressure and gradual deflation"is proposed.When the water volume drop in the wellhead is less than 1/4 of the previous water production,the high pressure state is maintained; when the water production in the wellhead is greater than or equal to 1/4 of the previous water production,the needle valve should be slightly opened by 10°/360°.For gradually outgassing,the gas production is stable for 3 days,then the needle valve is increased by one step,otherwise the number of steps of the needle valve is reduced.Through the field test of 5 wells,4 wells have obvious effects.The practice shows that the method of"long casing pressure and gradual deflation"is beneficial to the CBM wells with short initial gas seeing time and initial cumulative water production.
2019 S2 v.25 [Abstract][OnlineView][Download 287K] - HAN Tairan;KONG Lingpo;State Key Laboratory of Coking Coal Exploitationand Comprehensive Utilization,China Pingmei Shenma Group;Institute of Energy and Chemical Industry,China Pingmei Shenma Group;Mine Oil Products Branch,China Coal Research Institute;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;
For leveling mining area coal mine fully mechanized equipment transmission medium filter plugging pipe bracket corrosion phenomenon such as PaoMaoDiLou impact downhole environment and the normal production of technical problems,the ratio of mining area overall water quality analysis of composite additive lubrication test method were analysed,and a kind of green new stable transmission mediumsuitable for fully mechanized mining equipment of hydraulic support in Pingdingshan coal mining area was developed. Based on the analysis of the water quality of the liquid distribution water in Pingdingshan coal mining area,the parameters of the concentrate ratio( pH value,hardness,SO_4~(2-)、Cl~-) were determined.It has realized the green and super stable production,met the wide adaptability of the complex water quality in Pingdingshan area,and solved the technical problems such as the continuous disassembly and cleaning of the filter screen,the blocking of the gate valve,the increase of the cost,the environmental pollution and so on.At the same time,it provides targeted media products for Pingshan coal mine area to ensure the continuous normal operation of mining equipment and reduce the oil cost of the mining area,which is of great significance to guide the comprehensive mining equipment in Pingshan coal mine area to correctly select and apply hydraulic transmission media.
2019 S2 v.25 [Abstract][OnlineView][Download 190K] 下载本期数据