2013年05期目次

  • CFD simulation of gas-solid two-phase flow in air classifier for moist fine coal

    JIAO Yang;ZHANG Xinxi;LI Haisheng;College of Science,China University of Mining and Technology;School of Chemical Engineering and Technology,China University of Mining and Technology;

    A two-dimensional computational fluid dynamics(CFD) model is developed for the air classifier of laboratory scale using the Realizable k-ε turbulence model and Euler-Lagrange's method of discrete phase.Obtain the distribution of airflow velocity,static pressure,turbulent kinetic energy in classifier.Simulate the motion trails of coal particles in different sizes.Simulation results show that setting slant-ranked separation blades can create pressure and flow step in classifier,enhance the flow field above the guide plates and promote coal carrying effect of fluid.The guide plates setting in classifier create a strong flow between the feeding inlet and light products outlet,which is beneficial to coal separation.Guide plates and slant-ranked separation blades in classifier can weaken the turbulence and increase the collisions with coal particles.As moist fine coal feed in classifier,small particles are dragged to the light products outlet by gas flow and big particles fall along the slant-ranked blades to the heavy products outlet by gravity.Collisions can enhance comminuting and separate the particles in aggregation for the middle size particles.For large size particles or aggregation,collisions are weak.

    2013 05 v.19 [Abstract][OnlineView][Download 940K]

  • Technical transformation of coal slime water processing system in Pingshuo No.1 coal preparation plant

    WANG Jianjun;LIU Chunlong;Shanxi Xiaohuigou Coal Co.,Ltd.,China Coal Energy Co.,Ltd.;

    To resolve the problems of excessive slime accumulation,thinning of filter cake and reduction of pressure filter handing capacity in Pingshuo No.1 coal preparation plant,analyse the size composition of underflow and overflow of classifying cyclone,find that the size of underflow and overflow is large,the ash of underflow is high,while that of overflow is opposite.Transform the slime water processing system by adding the first-stage and second-stage project,coarse slime separation and recovery system.In the first-stage project,recycle fine sandstone before slime feeding into thickener.In the second-stage project,the fine sandstone is separated from slime.The slime and fine sandstone are recycled by two recycling thickeners in two stages.After transformation,the high-ash fine sandstone mixed in slime reduce,decrease the load of thickener,stabilize the operation of pressure filter and thickener,avoid the clean coal pollution.The coal preparation plant increase clean coal yield 8.649×105 tons,sales revenue 4.63×108 yuan per year.Save the maintenance and material cost,reduce the workload,increase the processing capacity of coal preparation plant.

    2013 05 v.19 [Abstract][OnlineView][Download 465K]

  • Transformation of coarse slime separation system of Shenjiazhuang coal preparation plant

    XU Maowei;DU Wei;Shenjiazhuang Coal Preparation Plant,Jizhong Energy Fengfeng Group Co.,Ltd.;Cixian Vocational Technology Education Center;

    Due to high coarse slime content in Shenjiazhuang coal preparation plant,there were lots of problems such as coarse flotation tailings,high middlings loss and dense medium consumption.Based on the separation principle and application effects of TBS,transform the coarse slime separation system with TBS.Increase the raw coal desliming sieve water chute flow as well as flushing strength,add diversion plate in order to improve the efficiency of desliming sieve.Shorten the inclined plate spacing of inclined plate thickener,improve angle of inclination to reduce the content of coarse soil particle in overflow.Replace the small mesh sieve plate and increase the water jet equipment to improve the efficiency of dense medium.The results show that,after transformation,the yield of +0.500 mm coarse grain in inclined plate thickener overflow decrease from 10.10 percent to 2.10 percent.Flotation pressure reduce significantly and the clean coal recovery rate increase obviously.TBS for coarse coal slime has great separation effects.Dense medium consumption and middlings loss decrease by 1.11 kg/t and 4.76 percent respectively.

    2013 05 v.19 [Abstract][OnlineView][Download 443K]

  • Flotation agent reduction measures in Xinjulong coal preparation plant

    HOU Zanxue;CHEN Xiuqi;Shandong Xinjulong Energy Co.,Ltd.;

    There were lots of problems in Xinjulong coal preparation plant.The contact time between flotation agent and slime was short,the collecting performance of flotation agent was poor,the dosing process was uncontrollable.Transform the flotation system by adding dosing equipments and points,lengthening the contact time between agent and slime,adopting appropriate collector based on the slime properties,adding visual dosing tank.After transformation,the flotation agent decrease from 0.34 kg/t to 0.27 kg/t,clean coal extraction rate increase from 68 percent to76 percent,sometimes even over 80 percent.The mass ratio of collector and frother increase from 12:1 to(18~20):1.The concentration of clean coal is high,the stability of foam is bad.The discharging period of pressure filter maintains about 100 s.The coal preparation plant saves agent cost 2.757×106yuan.

    2013 05 v.19 [Abstract][OnlineView][Download 409K]

  • Experimental study on slime water sedimentation in Dashucun coal preparation plant

    CHEN Ye;TU Ya'nan;Beijing Headmen Group Resource Consulting Co.,Ltd.;School of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing);

    The analysis of slime water characteristics of Dashucun coal preparation plant show that,the overflow contains lots of extremely fine clay minerals,which lead to poor slime water settling effects,large medium consumption,unstable production.To resolve the above problems,select poly aluminum chloride(PAC) as coagulant and polyacrylamide(PAM) as flocculant,research their influence on coal slime settling effects,determine the best dosage and appropriate adding method of the coagulant and flocculant.Replace PAC with ferric chloride(PAFC),then conduct controlled trials,verify the settling effects of PAC and PAM combination.The results show that,when coagulant dosage increase,slime water become cleaner,and the slime compression effects become poorer.When the flocculant dosage increase,settling velocity of slime increase,and slime compression effects first improve,then become worse.The combination of PAC and PAM is the most suitable for Dashucun coal preparation plant.The settling effects get best while PAM dosage range from 500 g/t to 700 g/t and PAC dosage range from 25 kg/t to 30 kg/t.The research provides reference for Dashucun coal preparation plant transformation.

    2013 05 v.19 [Abstract][OnlineView][Download 615K]

  • Optimization design of Shagou coal preparation plant

    ZHANG Changming;Ewirgol Coal Preparation Plant,Xinjiang Coking Coal Group Co.,Ltd.;

    The analysis of Shagou raw coal show that,NO.1 coal is medium-ash,fragile,difficult-washed coal,which contains large slime and gangue.NO.2 coal is high-ash,ultra-washed coal,while the nature of NO.3 coal is opposite to that of NO.2 coal.NO.2 and NO.3 coal contain parting and large slime.Based on the products structure and equipments selection of Shagou coal preparation plant,divide the process into raw coal preparation system,desliming system,demedium and dewatering system,TBS raw slime separation system,medium recycling system,flotation and slime water treatment system.Determine the final separation process:Gangue whose particle size ranges from 100mm to 50 mm is removed by moving sieve,separate 50.0 mm to 1.0 mm particle,1.00 mm to 0.25 mm raw slime,-0.25 mm fine slime with pressurized three-product dense medium cyclone,TBS and flotation machine respectively.Layout main workshop,preparation,concentration and product workshop,conveying belt corridor.The optimization design has lots of advantages such as reasonable products structure,advance separation method and equipments,high automaticity,convenient for operation and maintenance.

    2013 05 v.19 [Abstract][OnlineView][Download 673K]

  • Capacity expansion and process renovation of Huoerxinhe coal preparation plant

    WANG Yunxiao;Huoerxinhe Coal Preparation Plant,Shanxi Coal Import and Export Group Co.,Ltd.;

    The process flowsheet analysis of Huoerxinhe coal preparation show that,-0.5 mm slime can't be separated effectively,the dehydration efficiency of coarse slime is low,the production capacity of slack coal is insufficient.The analysis of slime properties show that,the density fraction of -0.25 mm slime is nonuniform,its distribution likes an olive.The three main density fraction are 1.3 kg/L to 1.4 kg/L,1.4 kg/L to 1.5 kg/L and 1.5 kg/L to 1.6kg/L.When the clean coal ash is 10.50 percent,the theory yield of flotation clean coal is 77.53 percent,the theory separation density is 1.518 kg/L and the δ±0.1 content is 40 percent,the washability is difficult.Transform the coal preparation plant by adding the flotation process and slack coal processing system,replacing horizontal centrifugal dehydrator.After modification,-0.25 mm slime can be separated effectively,improve the clean coal yield,dehydration efficiency of coarse slime and handing capacity of slack coal system,decrease the handing capacity of thickener and slime water treatment system pressure,the coal preparation plant increases sales revenue 2.256×108 yuan per year.

    2013 05 v.19 [Abstract][OnlineView][Download 583K]

  • Medium consumption reduction measures in Baiyangling coal preparation plant

    QI Shanxiang;Beijing Huayu Zhongxuan Clean Coal Engineering and Technology Co.,Ltd.;

    To reduce the medium consumption in Baiyangling coal preparation plant,the desliming sieve add a spray of water to improve desliming performance and reduce slime content of medium system.Adjust the spray height and nozzle angle,move backward the spray pipe,add nozzle,regular clean and replace sieve plate,adjust the underflow opening angle of magnetic separator to improve the magnetite recovery,control dosage by slime water treatment medicament adding device,which is made in Baiyangling coal preparation plant,reinforce medium management and improve its storage conditions,govern the slime water leakage.After transformation,the medium consumption decrease from 1.20 kg/t to 0.50 kg/t,the magnetite power savings per year is worth about 1.68×106 yuan.Improve the production conditions and quality standard management,lay the foundation for the construction of safety,high efficiency of modern coal mine.

    2013 05 v.19 [Abstract][OnlineView][Download 632K]

  • Application of biological desulphurization technology based on 3DMINE

    HOU Diankun;ZHANG Taibao;ZHANG Yuansheng;LI Wei;College of Mining Engineering,Inner Mongolia University of Science and Technology;Civil and Environmental Engineering School,University of Science and Technology Beijing;

    The coal desulfurization methods include physical,chemical and biological method before combustion,sulfur capture technologies during combustion and flue gas desulfurization technologies after combustion.The feasible and environmentally friendly method is coal preparation technology and biological technology.Expound the removal mechanism about organic sulfur and inorganic sulfur.Introduce that biological desulfurization methods mainly include microbial leaching,microbial flotation and microbial flocculation method,analyse their advantages and disadvantages.With the help of 3DMINE software,adopt the Inverse Distance to generate the ore body on borehole interpolation and the Ordinary Kriging to assign the ore body with sulfur content,and the 3-D ore body model is set up finally.Analyse the sulfur content of ore body combining the physical and chemical desulfurization method before combustion.The results show that,the sulfur content of NO.6 to NO.2 coal seam,ranging from 0.59 percent to1.00 percent,1.00 percent to 1.72 percent,1.72 percent to 2.47 percent,2.47 percent to 2.93 percent,except the first one,desulfurize with coal preparation,biological and biological method.After desulfurization,the sulfur content of last one still ranges from 1.00 percent to 1.19 percent,which need to remove based on the organic sulfur removal mechanism.

    2013 05 v.19 [Abstract][OnlineView][Download 997K]

  • Commercial coal dynamic quality management system in Guqiao coal preparation plant

    ZHU Jinbo;YANG Lianzhu;LIU Haizeng;HAN Xin;ZHANG Yihong;QIU Yibing;School of Materials Science and Engineering,Anhui University of Science and Technology;Huainan Mining Industry (Group) Co.,Ltd.;

    Analyse the production process of steam coal and slack coal separating and regulating system in Guqiao coal preparation plant.The results show that it's necessary to combine and optimize the slack coal separating and regulating system.Based on the production process and workshop scale,evaluate the washing quantity of slack coal with commercial coal dynamic quality management system.The new type separating system can automatically control washing quantity.Duo to the new system,the maximum error between product ash and requested ash decrease from 0.67 percent to 0.37 percent,the minimum error decrease from 0.09 percent to 0.The adjustment error is requested in the range of -0.5 percent to 0.5 percent.So the new system meets the demand.The fluctuation range of washing quantity decrease from±80 tons to±30 tons,reduce the labor intensity,improve the stability of system,the commercial coal quality can be adjusted as requested.

    2013 05 v.19 [Abstract][OnlineView][Download 736K]

  • Operation standard of Eschka method for determination of total sulfur in coal

    WANG Qiuxiang;WANG Zhongmin;China National Center for Quality Supervision and Test of Coal;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources (China Coal Research Institute);Beijing Energy Conservation and Environmental Protection Center;Beijing Center for Quality Supervision and Test of Coal;

    According to GB/T 214-2007 Determination of the total sulfur in coal and practical experiences,using quantitative analysis chemistry experiment knowledge,expound the details,standard operation method steps in the process of Eschka method for determination of total sulfur in coal from the aspects of coal sample ignition,water extraction,precipitation of barium sulfate(BaSO4),filtration,washing,ignition and the like.The ignition temperature and time should be controlled accurately when the mixture mixed with coal and Eschka is ignited.Wash the crucible thoroughly with about 50 mL hot water while transfer the ignited mixture from crucible to beaker.Precipitation of barium sulfate should be performed under the conditions of " dilute solution,hot solution,slow drop,stir and aging".Filtration and washing are continuous processes.Filtration includes three steps which is decantation filtration,transferring the insoluble matter to filter and washing the residue or precipitate.When burning BaSO4 sediment,roll the filter paper into pyramidal shape,which is used to hold sediment,put the filter paper bag into crucible,then put the crucible into the cold-vented muffle furnace.Ash the paper gradually at 200 ℃ to 250 ℃,then heat it for 20 minutes to 40 minutes at 800 ℃ to 850 ℃.These studies provide the standard operation method and elaborate test procedure which enhance the maneuverability of the test project and ensures the accuracy,reliability and stability of the test results.

    2013 05 v.19 [Abstract][OnlineView][Download 676K]

  • Comparison of typical lignite drying technologies

    CAI Niangeng;Kailuan Group Co.,Ltd.;

    Analyse the principle,technical characteristics,key parameters of lignite drying technologies at home and abroad.Evaluate these technologies from the aspects of technology adaptability,process condition,drying effects,environmental influence.The results show that,the K-Fuel technology requires larger size of feed lignite than other technologies,so its adaptability is a little poorer.Treated by the investigative technologies,the upgraded lignite can be used as boiler fuel.The higher drying temperature,the better drying effects.The Zemag and K-Fuel technology operate under pressure condition,and other technologies operate under normal pressure.The technologies can reduce the moisture 7.0 percent to 25.0 percent and increase the calorific value 3.24 kJ/g to 5.94 kJ/g.The product of BCB,HPU-06,Zemag technology is briquette,whose size are adjustable.Treated by two other technologies,the product size is smaller than the feed lignite.Shenzhou technology has a large possibility to suck back,it also has an inapparent improvement on spontaneous combustion of lignite,while other technologies have better effects.The five technologies all have less impact on the environment.

    2013 05 v.19 [Abstract][OnlineView][Download 549K]

  • Lignite binderless moulding in powder engineering

    ZHU Bin;LI Bei;HUANG Lei;PANG Yongliang;JIA Ruiqing;School of Mechanical Electronic and Information Engineering,China University of Mining and Technology (Beijing);

    Based on the analysis of many lignite binderless moulding hypotheses,find that there are other internal causes influencing the lignite molding characteristics.Introduce the powder mechanics model of lignite binderless moulding.Deduce the average particle calculation formula of tensile strength under the bond types of binderless,liquid-bridge and solid-bridge.Investigate the main bond forces in different stages of lignite molding and corresponding.The strength of the final product depends on the bond stress between particles,which provides strength for lignite transportation and processing.

    2013 05 v.19 [Abstract][OnlineView][Download 622K]

  • Research progress on Fischer-Tropsch catalyst reduction technologies

    WANG Xianghui;XU Ming;MEN Zhuowu;WENG Li;National Institute of Clean and Low Carbon Energy;

    The success of Fischer-Tropsch synthesis process largely depends on the selection of catalysts and reduction process.Introduce the kinds of catalysts for Fischer-Tropsch synthesis and their application fields.Investigate the reduction process,containing the influence of catalytic promoter,crystalline structure evolution,reeduction kinetics and reduction technique.Research the influence of reduction atmosphere,airspeed,temperature and pressure on the synthesis performance of Fischer-Tropsch catalyst.The results show that,the synthesis presents obvious heterogeneous reduction behavior.Moderate promoter and reduction parameters can improve the reducibility,activity and selectivity of catalyst.

    2013 05 v.19 [Abstract][OnlineView][Download 627K]

  • Research on syngas to aromatics

    ZHANG Jing;SUN Xianfeng;QIAO Jing;TUO Tingting;FU Gang;MIN Xiaojian;Shaanxi Coal and Chemical Technology Institute Co.,Ltd.;

    According to the process,analyse syngas one-stage process,syngas two-stage process and cogenerating aromatics.The first process adopts composite catalyst,which is composed of F-T synthesis catalyst and aromatization catalyst or methanol dehydration catalyst and aromatization catalyst.The product aromatics have low selectivity,only about 50 percent.The second process adopts methanol dehydration catalyst and aromatization catalyst which are used separately in two reactors,syngas is converted to DME in the first reactor and DME is converted to aromatics in the second reactor,the product aromatics performance high selectivity,about 80 percent.The third process produces aromatics while manufacturing kinds of oil,which is easy to realize industrialization at present.Provide some suggestions for the development of syngas to aromatics.

    2013 05 v.19 [Abstract][OnlineView][Download 610K]

  • Characteristics and processing utilization of coal tar

    XU Chunxia;Beijing Research Institute of Coal Chemistry,China Coal Research Institute;Beijing Key Laboratory of Energy Conservation and Environmental Protection Coal-Based Carbon Materials;

    The deep processing of coal tar can lighten the reliance on petroleum products.Introduce the characteristics and composition of low-medium and high temperature coal tar.The results show that,feed coal properties and pyrolytic process play an important part in the characteristics of coal tar.Investigate the processing technologies of coal tar from the aspects of distilling preparation,distilling process,distillate processing and hydrogenation.At last,according to coal tar composition,introduce its application.

    2013 05 v.19 [Abstract][OnlineView][Download 753K]

  • Application of Cu-Fe based catalysts in synthesis of low carbon mixed alcohols from syngas

    SU Yanmin;ZHENG Huaan;FU Dongsheng;LI Kelun;XIAO Ronglin;LYU Xiaoli;State Energy Key Laboratory of Clean Coal Grading Conversion,Shaanxi Coal and Chemical Technology Institute Co.,Ltd.;

    The synthesis of low carbon mixed alcohols from syngas with high performance catalysts provides a new use pattern of syngas.The catalyst plays an important part in synthetic reaction.Introduce modified methanol catalysts,modified Fischer-Tropsch catalysts and rhodium-based catalysts.As one of the modified Fischer-Tropsch catalysts,Cu-Fe based catalysts are widely used for low cost,mild reaction condition,high activity and great alcohol and C2+OH selectivity.Introduce the function mechanism of Cu-Fe based catalysts,and the influence of main components,promoters,carriers and preparation methods on their performance.

    2013 05 v.19 [Abstract][OnlineView][Download 738K]

  • Comprehensive utilization of pulverized coal pyrolysis product coke powder

    LI Xin;ZHANG Shengjun;XU Jie;ZHENG Huaan;Shaanxi Coal and Chemical Technology Institute Co.,Ltd.;

    Based on the characteristics of Northern Shaanxi jet coal,find that low-medium temperature pyrolysis is the best utilization technology for jet coal.The studies show that,the coke powder makes up about 70 percent of low-medium temperature pyrolysis products,the power that the coke powder contains is about 80 percent.So the utilization of coke powder is the key of jet coal low-medium temperature pyrolysis research.Introduce six kinds of utilization methods,including power generation by combustion process,gasification,preparation of coal water slurry,briquette,spray-blow coal and adsorbent.Provide that the development of coke powder standard is an urgent affair for utilization of pulverized coal.

    2013 05 v.19 [Abstract][OnlineView][Download 584K]

  • Kinetics and thermodynamics of coal swelling

    ZHANG Xiaojuan;SHENG Qingtao;SHEN Jun;LING Kaicheng;College of Chemistry and Chemical Engineering,Taiyuan University of Technology;Shanxi Radio and TV University;

    Based on the mechanism of coal swelling and hydrogen bond within the coal,introduce the nature of coal swelling from the aspects of kinetics and thermodynamics.Investigate the influence of solvents properties,oxidation,temperature,particle size and heat treatment on swelling kinetics.The results show that,during the swelling process,apparent activation energy and rate constant are influenced by the steric properties and shape of solvent molecular.The synergistic effect of mixed solvent increase the swelling rate and apparent activation energy.Drying condition of extracted coal and oxidation of raw coal can transform swelling mechanism greatly.Introduce the application of coal swelling technology in coal molecular structure and coal liquefaction process study.

    2013 05 v.19 [Abstract][OnlineView][Download 686K]

  • Application of fly ash in coal-fired boiler flue gas desulfurization

    LI Ting;XIAO Cuiwei;ZHANG Xin;SONG Chunyan;WANG Naiji;Energy Conservation and Engineering Technology Research Institute,China Coal Research Institute;State Key Laboratory of Efficient Mining and Clean Utilization of Coal Resources(China Coal Research Institute);National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute);

    Overview the domestic SO2 emissions status and its reduction targets during the "Twelfth Five-Year Plan" period,as well as the structure characteristics of fly ash.Introduce the preparation and desulfurization process,desulfurization mechanism,industrial application of composite fly ash desulfurizer at home and abroad.Investigate the dry or semi dry flue gas desulfurization technologies,which directly use fly ash from coal-fired boiler as desulfurizer.Look forward to the application prospect of fly ash desulfurizer in flue gas desulfurization.

    2013 05 v.19 [Abstract][OnlineView][Download 638K]

  • Analysis of China coal water slurry industry situation and development environment

    ZHANG Yonggang;Department of Enterprise Management,China Coal Research Institute;

    Coal water slurry(CWS),whose production technology is increasingly mature,is widely used as fuel and chemical material.Based on the analysis of CWS production technology as well as its domestic supply and demand status,carry out PEST analysis(political,economic,social and technological factors analysis) according to the industry environment.The research reveals the opportunities and threats the industry faces,which provides reference for decisionmakers.

    2013 05 v.19 [Abstract][OnlineView][Download 834K]

  • Energy saving measures analysis of coal preparation plant

    GUO Qinhong;Guizhou Coal Mine Design & Research Institute;

    To reduce the energy loss in each link from production to consumption and promote sustainable development of coal industry,introduce the measures the coal preparation plants adopt from the aspects of layout,process design,equipments selection,power supply system,ground building,water supply and drainage system.The results show that the coal preparation plants mainly consume electricity and water,the energy consumption for per unit coal output directly influence production cost and economic benefits.Energy saving management and technical transformation can reduce energy consumption in coal production and improve energy utilization efficiency.

    2013 05 v.19 [Abstract][OnlineView][Download 646K]

  • Comprehensive utilization of coal gangue

    ZHANG Shixin;LIU Dong;SHAO Fei;LUO Yingqiang;LI Wansheng;Huaneng Clean Energy Research Institute;Guangdong Electric Power Design Institute;Qinghai Salt Lake Industrial Co.,Ltd.;

    Coal gangue account for about 10 percent to 20 percent of raw coal's mass.The comprehensive utilization rate of domestic coal gangue is around 62.2 percent.To better utilize coal gangue,based on the analysis of coal gangue emission reduction technologies,direct and modified use technologies,utilization of heat energy and residue generated by coal gangue burning technologies,provide several coal gangue comprehensive utilization methods.

    2013 05 v.19 [Abstract][OnlineView][Download 828K]

  • Classification of coal,coal gangue and gangue based on dry basis gross calorific value

    WU Jie;ZOU Jin;ZHU Tong;Guizhou Agency of Quality Supervision and Inspection of Coal Product;

    Guizhou is a great coal producing province in China,its coal annual output are more than 1.4×108 tons,and steam coal are over 7×107 tons.Due to lower electricity price,the coal price between Guizhou Province and other provinces has great differences.It's common to see that large amount of coal gangue,gangue and other impurities mixing in commercial coal.To resolve this problem,precisely classify and name the coal,coal gangue and gangue based on their dry basis gross calorific value,regulate coal blending methods,improve steam coal quality.This method saves coal resources and protects environment.

    2013 05 v.19 [Abstract][OnlineView][Download 641K]

  • Determination of smoke gas pollution source intensity for biomass direct-fired boiler

    GE Guangrong;Environmental Protection Institute,Xi'an Research Institute of China Coal Technology & Engineering Group Co.,Ltd.;

    Biomass direct-fired power generation is the second most important renewable energy power generation technology,wind power generation is the first one.Currently,environmental impact assessment is regarded as a precondition of project to approve and set up a file management in China.The engineering data provided in the feasibility study phase can't meet the requirements of EIA engineering analysis.How to reasonably determine the concentration of flue gas emission,thus evaluate the feasibility and rationality of the evaluation methods,and forecast the impact of atmospheric pollution,have become prevail problems during the preparation and review of EIA reports.There is still no related evaluation specifications in China,EIA have great differences in ascertaining the flue gas emission source.Taking one 1×30 MW biomass power generation project as example,determine the biomass direct-fired boiler smoke gas source method based on the connection of analogy method,material balance algorithm,measurement method and relevant experimental data method,with an aim to improve the related specifications that have not been promulgated in China.

    2013 05 v.19 [Abstract][OnlineView][Download 718K]

  • Research and application of coal gangue disposal technologies in coal preparation plant

    GUO Binbin;FU Lingyi;PANG Mingjin;Coal Preparation Plant of Jining NO.3 Coal Mine,Yanzhou Coal Mining Co.,Ltd.;

    Coal gangue is the solid waste produced during coal mining and preparing.The gangue,generated by Jining NO.3 coal mine,were transported from coal mine by truck,which harmed the production and polluted the environment.Rising naphtha and diesel oil and high maintenance cost increase the transportation cost.To resolve this problem,install large-scale toothed roll crusher and gangue outward-transporting belt,cancel hand picking gangue process,collect the gangue from each gangue generating site,then uniformly dispose.The new program reduce the labour intensity,accident rate and operating cost,realize cleaner production.

    2013 05 v.19 [Abstract][OnlineView][Download 739K]

  • Influencing factors of Liulin coal seam permeability and its fuzzy comprehensive evaluation

    LI Ling;TANG Dazhen;XU Hao;MENG Yanjun;YU Tingxu;School of Energy Resources,China University of Geosciences (Beijing);

    Coal reservoir permeability is one of the crucial parameters for favorable coalbed methane development zone.Through analysis of the coal seam permeability of Liulin area and a large number of coal seam gas exploration and production information,conduct two major factors influencing the local coal seam permeability,which are coal body itself condition(primary pore structure,fracture of coal body structure,coal body structure) and coal seam saves conditions(depth,the crustal stress,the reservoir pressure).According to the permeability of multiple coal seam changes greatly in this area,apply multi-level fuzzy comprehensive evaluation method to establish the coal seam permeability evaluation index system.Based on the mathematical model of fuzzy comprehensive evaluation of permeability,this area is established the fuzzy comprehensive evaluation of permeability.Based on the evaluation results,the coal seam permeability of Liulin area is on the level of medium,the evaluation results are consistent with the measured results,which offer a new method to predict permeability level of ore district or mining area.

    2013 05 v.19 [Abstract][OnlineView][Download 1089K]

  • Automatic control technology of coal slime water treatment

    CHENG Yali;LIU Haizeng;WANG Haitao;School of Materials Science and Engineering,Anhui University of Science & Technology;

    Through the analysis of domestic slime water treatment process,introduce the relevant technologies and equipments.Based on extensive documentation of automatic control technologies of slime water treatment,summarize the automatic control situation of tailings concentration and pressure filter operation.Present the existing problems and development tendency of the technologies.

    2013 05 v.19 [Abstract][OnlineView][Download 684K]

  • Change law of gas concentration in upper corner based on least squares method

    LIU Bin;CPI Xinjiang Energy Chemical Group Sikeshu Coal Co.,Ltd.;

    During the period of 16122-1 working face coal winning,monitor the working face air volume Q,daily output A,gas concentration in upper corner C.Fit the above three data and get gas concentration variation curve.Analyse the fitting method and effect.The fitting results don't match perfectly with the theoretical results.Combined with the actual conditions,investigate the reasons.The results show that,the change of C and A is synchronized,while Q has the opposite effect.The least squares method is achievable.

    2013 05 v.19 [Abstract][OnlineView][Download 774K]

  • Determination of total moisture in coal

    ZOU Jin;WU Jie;ZHU Tong;Guizhou Agency of Quality Supervision and Inspection of Coal Product;

    The total moisture in coal is one of the most important valuation indicators for coking coal.The steam coal is evaluated by the low heating value of received basis.A 1 percent increase in total moisture would decrease about calorific value 260 J/g.The accurate determination of total moisture can reduce the quality dispute between supply and requisitioning parties and make the coal valuation more scientific and fair.Through many years' practice,provide feasible operating methods for the evaluation of steam coal.

    2013 05 v.19 [Abstract][OnlineView][Download 684K]

  • Description of GB/T 16417-2011 Method for evaluating the washability of coal

    ZHANG Fengtong;Coal Quality Inspection Center,Kailuan Group Co.,Ltd.;

    The GB/T 16417-1996 Method for evaluating the washability of coal had come into effect from 1997 to 2009.With the development of industry technologies and standardized technologies,the primary standard can't suit the needs of development in many aspects.It also don't meet the demands of GB/T 1.1-2009 in the aspects of structure and format.Introduce the GB/T 16417-2011 Method for evaluating the washability of coal and the significance of making such standard.

    2013 05 v.19 [Abstract][OnlineView][Download 684K]
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