2013年04期目次

  • Application of SSC classification crusher in Shuangxin mining industry coal preparation plant

    DING Yong(Tangshan Branch,China Coal Technology and Engineering Group Co.,Ltd.,Tangshan 063012,China)

    Introduce the problems in Shuangxin mining industry coal preparation plant,large gangue fell easily,especially the sharp ones could damage the conveying equipments,the equipments were overloaded due to a great number of large raw coal.The analysis of structure and working principle of SSC classification crusher show that it has a series of advantages such as easy manufacture and repair,low energy consumption and cost,strong crush capacity and durability.So the plant adopts one SSC1000 crusher to control the particle size of raw coal.Install the crusher in the middle of chute,which connects the main shaft and silo.Raise the crusher 3.5 m by steel structure support,so the chute through crusher has sufficient height to adjust the angle and position.The slideway of crusher is perpendicular to the conveying belt.Extend the slideway to the outside of workshop.After removing the crusher,the left chute is used as coal transport channel.The analysis of application effect of SSC classification crusher show that,+ 300 mm lump coal and gangue is completely eliminated,raw coal fall and conveying belt damage phenomenon is controlled.The plant increases economic benefits more than 2×106 yuan per year.

    2013 04 v.19 [Abstract][OnlineView][Download 202K]

  • Technological design of Huoerxinhe coal preparation plant

    ZHANG Ruiwen,ZHANG Xinlong,WANG Chengjiang,TANG Ligang(Coal Mining & Designing Department,Tiandi Science & Technology Co.,Ltd.,Beijing 100013,China)

    Analyse the raw coal properties of Huoerxinhe coal preparation plant through proximate analysis,elemental analysis,particle size composition and washability evaluation.The results show that,the raw coal is low and low-medium ash,while the latter is in the majority,low volatile,ultra-low and low sulfur,high and extra-high calorific value,easy and extremely-easy grindability,low reactivity to CO2 and medium slagging.The coal is brittle,frangible and difficult to degrade.The lump coal is medium washability while the density fraction is less than 1.7 g / cm3,the fine coal is easy washability and medium washability while the density fraction is less than 1.6 g/cm3 and 1.8 g / cm3 respectively.Based on the product structure of coal preparation plant,separate the lump coal and slack coal successively.The top size is 100 mm.Determine the suitable preparation process for Huoerxinhe coal preparation plant.Separate the 100 mm to 13 mm lump coal with heavy medium shallow groove,deslime 13.00 mm to 0.75 mm fine coal first,then separate with pressurized three-product heavy medium cyclone,separate 0.75 mm to 0.10 mm coarse slime with spiral separator.Concentrate the slurry-0.10 mm first,then recover and dry.Finally analyse the characteristics of the process,summarize the advantages of this process that each of lump coal and fine coal is processing,work and accidents concentrating machine are arranged in parallel.

    2013 04 v.19 [Abstract][OnlineView][Download 287K]

  • Transformation of rising flow process of shallow groove separator

    DU Yingfeng(Pansan Coal Preparation Plant,Huainan Mining Industry(Group) Co.,Ltd.,Huainan 232096,China)

    Introduce the technical principle of heavy medium shallow groove separator.There were lots of problems in Pansan coal preparation plant.The circulating pump for qualified medium was too large,the rising flow process was imperfect and difficult to stably control,the layout of shallow groove pipelines was unreasonable,the lift was high,the circulating medium pump working point deviated from the maximum efficiency zone and the like.To resolve these problems,add a discharge pipe to the rising flow pipe,adjust the rising flow pressure to 0.033 MPa by installing the valves and digital pressure gauge,ensure the groove coal density-dominant separation,stabilize suspension concentration,determine the front funnel upwelling pressure is 0.040 MPa,control pipe gate valve and pressure gauge to ensure that the pressure is accurate,check the status,operation and shallow groove separation machine operation continuity.After transformation,avoid the clean coal mixing in gangue,increase the clean coal yield,the rising flow can be manually non-polar regulated,decrease the separation density and dosage of magnetite powder,the profits increase by 3×106 yuan every month.

    2013 04 v.19 [Abstract][OnlineView][Download 411K]

  • Optimization of washing process of Guojiawan coal preparation plant

    LIU Jianhua(Guojiawan Coal Mine,Yulin Shenhua Energy Co.,Ltd.,Yulin 719315,China)

    The flip-flow screen has a series of merits such as high screening efficiency and handing capacity,low power consumption,noise and dynamic load,its screen aperture is not easy to jam.There were lots of problems in Guojiawan coal preparation plant,the slime water processing system was overloaded,the slack coal processing system was unstable,the upgrading effects wasn't obvious,the viscosity of slime was high.Based on the coal qualities,provide four kinds of preparation methods,which are complete washing,50 percent slack coal washing,fines removal with 6 mm flip-flow screen,fines removal with 3 mm flip-flow screen.The analysis of productivity and economic benefits of these four methods show that,the third method can decrease the raw coal feed,processing cost and slime productivity,increase the system stability.So choose the third method to optimize Guojiawan coal preparation plant.

    2013 04 v.19 [Abstract][OnlineView][Download 178K]

  • Determination of coal separation process of Tangkou coal preparation plant

    WANG Fenghong1,PANG Jianye2,WANG Daguo3(1.Coal Transport and Marketing Company,Shandong Energy Zibo Mining Group Co.,Ltd.,Zibo 255120,China;2.Coal Transport and Marketing Department,Zibo Guangzheng Industrial Co.,Ltd.,Zibo 255120,China;3.Tangkou Coal Preparation Plant,Shandong Energy Zibo Mining Group Co.,Ltd.,Zibo 255120,China)

    The separation process had a series of problems in Tangkou coal preparation plant.The separation capacity couldn't match with the mining capacity,the raw coal quality was poor and product structure was irrational and the like.Based on the coal quality,product structure,characteristics of three-product pressurized feeding dense medium cyclone,TBS and slime dense medium cyclone,determine the process after transformation.The particle ranging from 50.0 mm to 0.5 mm is separated with pre-desliming two-product pressurized feeding dense-medium cyclone,which is monitored with real-time density-control system.The particle ranging from 0.5 mm to 0.3 mm is separated with three-product pressurized feeding dense medium cyclone.After transformation,the clean coal yield is improved by 3 percent,the coal mixed in gangue is decreased to less than 1 percent.Improve the coal preparation efficiency,products value and products recovery,simplify the slime recovery system,the medium consumption is reduced to less than 1.5 kg / t,by about 30 percent.The workers number of every shift required is decrease by 6.

    2013 04 v.19 [Abstract][OnlineView][Download 151K]

  • Application of efficient quick-open type pressure filter in Tunlan coal preparation plant

    LIU Zhiyong(Tunlan Coal Preparation Plant,Xishan Coal Electricity(Group) Co.,Ltd.,Gujiao 030206,China)

    Analyse the structure and working principle of XMZ-750 pressure filter.There were lots of problems such as long filtration time,low dehydration efficiency,high failure rate and maintenance cost.The KMZG450 /2000-U type efficient quick-open pressure filter has the advantages of advanced design,high degree of automation,convenient operation,so Tunlan coal preparation plant replaces the XMZ-750 pressure filter with four sets of KMZG450 /2000-U ones and auxiliary equipment.After transformation,eliminate the potential safety hazard caused by primary filter girder crack,reduce six sets of equipments and four workers.The pressing efficiency is improved by more than four times,the moisture content of filter cake is reduced to less than 18 percent,the level of automation is improved,the coal slime recovery system is optimized,the mass fraction of circulating water is decreased from 13 g / L to less than 9 g / L.Improve the separation efficiency of heavy medium system,the clean coal yield is increased by 0.5 percent,medium consumption is reduced by 8 percent,the profits increase by 2.535×107 yuan every year.Provide the improvement methods for KMZG450 /2000-U type efficient quick-open pressure filter from the aspects of operation and maintenance,the connection between posts and pipe design optimization.Perfect the properties of new type pressure filter by installing liquid level sentor in filtrate receiver and aerated water separator at end,connecting the barrel bottom,reducing the length and elbows of air blowing pipe,installing dual pull type movable cover.

    2013 04 v.19 [Abstract][OnlineView][Download 233K]

  • Experimental research on Datong low-rank coal flotation

    ZHAO Haiyang(Clean Coal Branch,Datong Coal Mine Group Co.,Ltd.,Datong 037016,China)

    The analysis of size distribution of Datong Jurassic low-rank slime show that the argillitization of coal samples is not serious and the size distribution is suitable for flotation.The X-ray photo electron spectroscopy(XPS) is used to test the surface property of coal samples,the results show that the surface oxygen-containing groups mainly are C—OH and —COO,which are highly hydrophilic and make the flotation difficult.The acceleration of cationic surfactant dodecyl amine on slime flotation is discussed through flotation experiments taking kerosene as collector and sec-octyl alcohol as frother.The results indicate that the addition of small dodecyl amine can reduce the consumption of flotation reagents,increase the sample surface hydrophobicity and improve the flotation effect.The optimum dosage of sec-octyl alcohol and combined collector respectively are 200 g / t and 1000 g / t,and the mass fraction of dodecyl amine is 5 percent.Under this condition,the yield of clean coal,tail ash,combustible material recovery and faultless index of flotation respectively increase by 7.11 percent,13.47 percent,7.77 percent and 3.69 percent.

    2013 04 v.19 [Abstract][OnlineView][Download 209K]

  • High concentration slime water flocculating test and fractal theory

    FAN Wei(Energy Conservation and Engineering Technology Research Institute,China Coal Research Institute,Beijing 100013,China)

    Taking the slime water of one coal preparation plant as research object,carry out high concentration slime water flocculating test,the PAM is used as flocculant.Investigate the relationship between dosage and slime setting velocity as well as the influence of stirring rate and time on flocculation effect.Determine the best flocculation condition.The results show that,when the PAM dosage is 0.10 percent,the maximum setting velocity of slime average is 0.58 mm / s.When the stirring intensity is 150 r / min and 80 r / min,it needs 40 s and 60 s respectively to get better effects.Calculate the fractal theory under the best flocculation condition,which is 1.5737 and 1.7034 when the stirring intensity is 150 r / min and 80 r / min.The combination of these two kinds of stirring methods is beneficial for slime flocculation.

    2013 04 v.19 [Abstract][OnlineView][Download 483K]

  • Slack coal homogenization in Chengjiao coal preparation plant

    HAO Chunjian,XU Shihui,WU Lin,JI Jixing(Chengjiao Coal Preparation Plant,Yongcheng Coal Electricity Group Co.,Ltd.,Yongcheng 476600,China)

    The slack coal production of Chengjiao coal preparation plant had the following problems: the lifting capacity of coal tub was low,its blending effects was poor.Wide installation angle led to surplus slack coal.There were lots of potential safety hazard during system maintenance.Delayed response of blending system brought about noneffective quality control.Redundant and inefficient equipments consumed tremendous extra energy.Stabilize the slack coal production by transforming blending system and products quality automatic control system,homogenizing slack coal quality when it is abnormal.The transformation realize digitization and automation,eliminate safety hazard,reduce the labor intensity.The preparation plant increases economic benefits by 2.169 ×107 yuan,if this technology was used nationwide,it would increase by 2.473×109 yuan.

    2013 04 v.19 [Abstract][OnlineView][Download 231K]

  • Additivity of mixed coal grindability index

    LI Ziwen1,ZHOU Zhicheng2,SUO Yongjian3(1.College of Chemistry and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;2.Wangjiazhai Coal Preparation Plant,Guizhou Shuikuang Holding(Group) Co.,Ltd.,Liupanshui 553000,China;3.Beijing Huayu Engineering Co.,Ltd.,China Coal Technology and Engineering Group Co.,Ltd.,Pingdingshan 467002,China)

    Compare the measured and calculated value of grindability index(HGI) of single coal and mixed coal.The results show that same proportion and different mixed coal for the measured and calculated value are not completely equal,there is a certain error.There are two main reasons.Error exists in the experiment and the grindability index(HGI) of single coal has no linear additivity.Verify the HGI between measured and calculated value through the t test validation.The results show that,keeping the same proportion and different mixed coal,measured and calculated value of HGI of mixed coal between large number of difficult grinding coal and a small amount of easy grinding coal have significant differences.Changing the proportion,the measured and calculated value of different mixed coal is relatively close.Keeping the mixed coal type unchanged,when the proportion is different,the error between measured and calculated value of HGI is not in the normal range.HGI hasn't linear relationship with mixed coal proportion.The HGI of single coal has no linear additivity.

    2013 04 v.19 [Abstract][OnlineView][Download 274K]

  • Dry distillation of Yulin coal

    ZHANG Weidong(Hunan Huaying Energy Technology Co.,Ltd.,Changsha 410007,China)

    The analysis of Yulin raw coal quality show that it's high-quality coal with low moisture,ash and sulphur,high volatile,medium-high calorific value,which is suitable for low-temperature carbonization.First crush the Yulin raw coal,then analyse the influence of heating temperature and method,segmentation methods,raw coal particle size on dry distillation.Determine the suitable condition of carbonization process for Yulin coal.The results show that Yulin coal has higher strength,which help to improve utilization rate.When the carbonization temperature reaches 600 ℃,the tar yield reaches up to above 9.0 percent.The tar yield gotten by inner-heating technology is 0.7 percent higher than outer-heating method.The inner-heating technology has high heating efficiency,uniform heating and the like.To ensure the yield and quality of product,contrast one,two,three sections of the furnace,find that the three-stage furnace staging process is more suitable for Yulin coal carbonization.The optimum coal particle size for dry distillation ranges from 5 mm to 50 mm.Analyse the characteristics of coal tar and semi-coke,find that coal tar should be the main product in the carbonization process.

    2013 04 v.19 [Abstract][OnlineView][Download 191K]

  • Influence of modification and grain-size gradation on slurryability of lignite

    LIANG Xing1,2,3,DUAN Qingbing1,2,3,YAN Lili1,2,3(1.Energy Conservation and Engineering Technology Research Institute,China Coal Research Institute,Beijing 100013,China;2.State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute),Beijing 100013,China;3.National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute),Beijing 100013,China)

    Taking Shaotong lignite and Hulun Buir lignite as research objects,the proximate analysis and elemental analysis were done for these two kinds of lignites.Investigated the change of physical and chemical properties after modification.The optimal modification condition is that the coal granularity is less than 1 mm,heating time is 0.5 h,heating temperature is 250 ℃.Study the influence of gradation on the slurryability of modified lignite.The results show that the appropriate modification temperature ranges from 250 ℃ to 300 ℃,the optimum mass ratio of grainsize gradation is 40∶ 60,the slurry concentration of modified Shaotong lignite and Hulun Buir lignite improves by more than 5.4 percent and 3.6 percent respectively.

    2013 04 v.19 [Abstract][OnlineView][Download 280K]

  • Influence of inertinite content on liquefaction performance of Shangwan coal

    LI Yonglun,GAO Shansong,LI Kejian(China Shenhua Coal to Liquid and Chemical Shanghai Research Institute,Shanghai 201108,China)

    The liquefaction experiments of five Shangwan coals with different inertinite content were carried out in a high pressure autoclave.The effect of reaction temperature ranging from 440 ℃ to 465 ℃ and initinal hydrogen pressure from 7 MPa to 11 MPa on the hydroliquefaction of five coals were investigated.The results show that the conversion,oil and gases yield,hydrogen consumption of 1# to 4# coal increase with the rise of temperature,meanwhile asphaltene decrease between 440 ℃ and 465 ℃,conversion of 5# coal decrease when the temperature is higher than 460 ℃.Conversion rate,oil and gases yield,hydrogen consumption of coal with different inertinite content increase with the increase of initial hydrogen pressure while asphaltene decrease.The higher the inertinite maceral content,the lower the conversion and oil yield.

    2013 04 v.19 [Abstract][OnlineView][Download 681K]

  • Improvement on coal water slurry concentration prepared from Inner Mongolia low-rank coal

    ZHANG Guiling1,2,3,DU Liwei1,2,3,LIU Yewei1,2,3(1.Energy Conservation and Engineering Technology Research Institute,China Coal Research Institute,Beijing 100013,China;2.State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute),Beijing 100013,China;3.National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute),Beijing 100013,China)

    High inherent moisture,lots of oxygen-containing functional groups and poor grindability of low-rank coal lead to lower coal water slurry(CWS) concentration,which limit the subsequent gasification.To resolve these problems,taking Inner Mongolia NO.1 and NO.2 coal as research objects,compare the characteristics of two kinds of coal water slurry which are prepared by traditional CWS preparation method and preliminary grinding method respectively.The results show that,the latter method can dramatically improve the content of-0.075 mm size fraction.Stabilize the apparent viscosity at 1200 mPa.s,when the mass ratio of middings and fines is 70 to 30,the highest CWS concentration of these two coals is 61.39 percent and 58.52 percent respectively,improved by 3.92 percent and 3.94 percent respectively compared with traditional CWS preparation method.The improvement of CWS concentration is beneficial for the subsequent gasification.

    2013 04 v.19 [Abstract][OnlineView][Download 170K]

  • Gasification characteristics of large size lignite-char

    JIN Zhiwei1,TANG Jingjie1,ZHANG Shangjun2,WANG Zhenzhou1,YANG Haijing1,ZHANG Kang1(1.Shanxi Provincial Guoxin Energy Development Group Co.,Ltd.,Taiyuan 030006,China;2.Shool of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

    Underground coal gasification(UCG) technology can achieve clean gas through controlling the combustion of coal seam underground.Based on the characteristics of coal seam gasification,char-steam reactions at elevated temperature are investigated kinetically using self-designed UCG-simulated gasifier.The effects of temperature,flow rate of steam and particle size of coal on gasification reaction are researched with relevant kinetic parameters.The results show that,in a certain range,with the increase of steam flow rate,the carbon conversion rate and gasification rate increase.The particle size of coal has a significant effect on gasification process,while no obvious change law is observed.The higher the gasification temperature,the shorter the time needed to reach the same carbon conversion rate.The constant of reaction rate k gradually increases with the rise of temperature,but reaction order shows the contrary trend.The results supply a theoretical reference to the optimization of process conditions in UCG.

    2013 04 v.19 [Abstract][OnlineView][Download 614K]

  • Determination of chlorine in direct coal liquefaction products

    JIANG Yuanbo1,SUN Ce2,LI Kejian1,ZOU Ying2,GAO Shansong1(1.National Engineering Laboratory for Direct Coal Liquefaction,China Shenhua Coal to Liquid and Chemical Shanghai Research Institute,Shanghai 201108,China;2.School of Chemical Engineering,East China University cf Science and Technology,Shanghai 200237,China)

    An analytical method for determination of trace chlorine in coal direct liquefaction products was established by the combination of high-temperature cracking combustion and ion chromatography.When the samples burn in high-temperature cracking combustion furance,the chlorinated compounds in samples transform into HCl or Cl2,which were absorbed by water,then formed chloride solution.Analyse Cl-content using ion chromatography and determine chlorine content in sample.The optimized determination condition is that,the combustion furnace temperature is 1300 ℃,the burning time is 10 minutes,the carrier gas flow rate is 1.5 mL / min,the sample mass range from 0.10 g to 0.16 g.The average recovery rate for chlorine are 106.61 percent and 94.82 percent.The RSD are 3.24 percent and 0.18 percent.Based on the analysis of direct coal liquefaction products chlorine content,obtain distribution information of chlorine content in coal liquefaction products.

    2013 04 v.19 [Abstract][OnlineView][Download 305K]

  • Actuality and development of coal and oil co-processing technologies

    ZHU Yufei(National Institute of Clean-and-Low-Carbon Energy,Beijing 102209,China)

    To resolve the problems in direct coal liquefaction,provide coal and oil co-processing technologies,meanwhile,analyse the advantages.Based on the analysis of coal and oil co-processing technologies at home and abroad,divide these technologies into four types according to the combination mode of coal and oil,function of oil during conversion.Investigate the principle,goal,strongpoint and limitation of each technology.Discuss the application effects of these technologies by typical examples.At last,present suggestions on the existing technical issues.

    2013 04 v.19 [Abstract][OnlineView][Download 343K]

  • Influence of blending coal combustion on boiler operation

    HU Chao(Nanjing Design and Research Institute,China Coal Technology and Engineering Group Co.,Ltd.,Nanjing 210007,China)

    Due to the increasing types of coal supplying to coal-fired power plants and larger portion of low-quality coal,there is a large difference in coal quality between the actual coal and the design coal,which affect the safe and stable operation of boiler.To resolve these problems,investigate the linear additivity of four coal quality indicators such as volatile,sulfur,calorific value and ash fusibility.Evaluate the security and stability of boiler from the coal quality linear additivity of blending coal.The results indicate that the coal blending technology can meet the security demands of boiler in power plants.The indicators such as volatile,sulphur,calorific value of blending coal have linear additive.Blend the coals whose quality is similar,find that there is obvious linear relationship between the blending coal and single coal.The ash fusibility doesn't have linear additive.To maximize the benefits of coal-fired power plants,it's necessary to bulid coal blending expert system according to relevant indicators of coal quality.

    2013 04 v.19 [Abstract][OnlineView][Download 290K]

  • Operation characteristics and economic benefits analysis of pulverized coal industrial boiler

    HE Haijun1,2,3,LI Xiaojiong1,2,3(1.Energy Conservation and Engineering Technology Research Institute,China Coal Research Institute,Beijing 100013,China;2.State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute),Beijing 100013,China;3.National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute),Beijing 100013,China)

    To better use pulverized coal industrial boiler and make it more adaptable to the market demands,compare it with chain-grate stocker from the aspects of operation characteristics and economic benefits.Gave a detailed introduction to its operation characteristics on the basis of process design,mechanical structure,system arrangement and production control.Taking an enterprise's pulverized coal industrial boiler as research object,analyse its fuel and operation cost.The results show that the pulverized coal industrial boiler has stronger adaptability and competitiveness,which provide reference for its market expansion.

    2013 04 v.19 [Abstract][OnlineView][Download 279K]

  • Research status of direct coal liquefaction residues pyrolysis

    XU Bang,CHU Mo,ZHANG Huihui,WANG Fang,LIU Lixin(School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

    Introduce the direct coal liquefaction residues pyrolysis from the aspects of pyrolysis character istics and pyrolysis mechanism.Summarize the best pyrolysis temperature.Residues act as a disincentive in the volatile release process during co-pyrolysis of coal and coal liquefaction residues.Based on the pyrolysis process of coal liquefaction residues,find that thermal fluidity and viscosity are the main limitations of amplification test during low temperature pyrolysis.Provide that the co-pyrolysis of residues and low rank coal can take full advantage of residues as hydrogen donor,meanwhile the catalytic reforming for intermediate products improve the oil yield and quality.The research expand the processing and utilization methods of residues,which is beneficial to high added-value utilization of direct coal liquefaction residues.

    2013 04 v.19 [Abstract][OnlineView][Download 165K]

  • Feasibility of preparing coal water slurry with Australian gas coal

    JIA Chuankai,SHI Lei,SU Huahan(Zhejiang Coal Science Clean Energy Co.,Ltd.,Tongxiangshi 314511,China)

    To resolve the problem of raw coal shortage,which is used for preparing coal water slurry,analyse the reserves,output and export volume of Australian coal.Find that signing long-term coal trading contract with Australian coal companies can have discount in coal price,transport price and tariff.This method also is beneficial for relieving the strain on resources and decreasing coal price.The results of slurrying experiment and industrial test show that,Australian coal property is great,which can be blended with Tianyi coal.When the as received basis mass ratio of these two components is 1∶1,the concentration of coal water slurry is more than 64.5 percent,the viscosity is less than 1400 mPa.s,the calorific value is greater than 17.562 MJ / kg.The blending coal can be used to prepare coal water slurry.

    2013 04 v.19 [Abstract][OnlineView][Download 200K]

  • Impact of coal mining on groundwater resources in Yushen mining area

    GUO Xin(Research Institute of Environmental Protection,Xi'an Research Institute of China Coal Technology & Engineering Group Co.,Ltd.,Xi'an 710054,China)

    Yushen mining area is located in the bordering areas of northern Shaanxi loess plateau and Mu Us Sandland.The fragile ecological environment need scientific coal mining.Calculate the height of water flowing fractured zone which may form during 2-2 coal seam development with theoretical calculation method,mechanical model analysis,numerical simulation method based on mechanical properties of stratum.Analyze the differences among the results achieved by different methods.The results show that,the third method is the most reasonable and scientific.

    2013 04 v.19 [Abstract][OnlineView][Download 158K]

  • Technologies for coking wastewater treatment

    TIAN Lufeng1,2,3(1.Beijing Research Institute of Coal Chemistry,China Coal Research Institute,Beijing 100013,China;2.National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute),Beijing 100013,China;3.State Key Laboratory of Efficient Mining and Clean Utilization of Coal Resources(China Coal Research Institute),Beijing 100013,China)

    Coking wastewater is produced in coking process of coal pyrolysis carbonization,raw coke oven gas and petrochemical recovery and purification,which contains lots of pollutant and contaminates environment severely.The maturer coking waste processing techniques are physical-chemical,biological and chemical method,which respectively contains flocculence,adsorption,flue gas treatment and extraction method;aeration treatment,denitrificationnitration and biological fluid bed method;burning,ozonation process,oxygen catalytic oxidation method,electrochemical process and Fenton reagent method.The core is biological treatment,and its technological process is comprised of pretreatment,biochemical treatment,advanced treatment and wastewater reuse.The physical-chemical method is usually used in pretreatment,and physical-chemical process and physical-chemical-biological group technology are used in advanced treatment.The technological process,which is clean,efficient and low-cost,can realize zero release of coking wastewater and recycle of water resources to meet the demands of sustainable development of economy and society.

    2013 04 v.19 [Abstract][OnlineView][Download 383K]

  • Optimization of ammonia distillation technical process in coking

    LI Guozhong,SHAN Junjie(Tangshan Zhongrun Coal Chemical Co.,Ltd.,Tangshan 063611,China)

    There were lots of problems in ammonia distillation process,the handing capacity were small,the equipments were easy to jam,the temperature of wastewater for biochemical treatment system was high,gas phase ammonia content were low.Optimize the ammonia distillation in coking enterprise using chemical process simulation software.The results show that,when the sewage flow are 100 t / h,and the gas phase ammonia content are 40 percent,the most suitable steam consumption are 11 t / h and the reflux ratio is 2.25.Add ammonia still,surplus ammonia water trough,low temperature water cooler and new type sieve tray.After transformation,the handling capacity of ammonia distillation system is 100 t / h,waste ammonia water concentration is less than 50 mg / L,the gas phase ammonia content is more than 40 percent,the temperature of wastewater for biochemical treatment system ranges from 25 ℃ to 35 ℃.

    2013 04 v.19 [Abstract][OnlineView][Download 342K]

  • Application of bag filter in efficient pulverized coal industrial boiler

    WANG Shipu1,2,3(1.Energy Conservation and Engineering Technology Research Institute,China Coal Research Institute,Beijing 100013,China;2.National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute),Beijing 100013,China;3.State Key Laboratory of Efficient Mining and Clean Utilization of Coal Resources(China Coal Research Institute),Beijing 100013,China)

    Analyze the scope of pulse jet dust collector and air box pulse dust collector system in pulverized coal industrial boilers through investigating the principle and deashing modes of bag filter,characteristics of pulverized coal industrial boiler system as well as the practical application of collectors.Taking one bag filter in Cuncaotao NO.2 coal mine as research object,its main problem is that the filter bag lose effectiveness due to oxidation.According to the transformation of bag filter,provide its appropriate structure and maintenance methods,which is beneficial for design,installation and use of bag filter.

    2013 04 v.19 [Abstract][OnlineView][Download 446K]

  • Representativeness verification of coal mechanical sampling

    HAN Lipeng,ZHANG Jing(Hanfeng Power Plant,China Huaneng Group Company,Handan 056200,China)

    To ensure the representativeness of coal mechanical sampling,it is necessary to verify representativeness of mechanical sampling device.The precision of sampling is verified and counted by replicate sampling method,the results are used to evaluate if the sampling precision meet the expectations.The precision of the sample preparation is verified by the standard deviation counted by two groups which have ten pairing samples respectively.Based on the relationship between standard deviation and expected variance,evaluate the sample preparation precision.Test the bias of mechanical sampler when the precision is qualified and the test enough data with enough pairs and independent have no outliers.The results show that the verification bias is less than the maximum tolerable bias,the results gotten by coal mechanical sampler are representative.

    2013 04 v.19 [Abstract][OnlineView][Download 184K]

  • Design and application of PLC slime microwave drying automatic control system

    ZHANG Kang,LIU Shuliang,JING Jian,WANG Zilong(Shandong Borun Industrial Technology Co.,Ltd.,Zibo 255000,China)

    As an efficient and clean energy,microwave is widely used in food,medicinal materials and chemical industry.Based on the characteristics of slime,design PLC slime microwave drying automatic control system.The system uses Rockwell PLC as core component,EtherNet / IP as communication mode,which are used to monitor the voltaic arc,pressure,temperature and flow.The Factory Talk View Machine Edition is used to draw the control interface.The newly designed system is put into use in Jinneng Branch,Dawukou coal preparation plant.Test the moisture and calorific value of slime after drying.The results show that,the system has better stability,drying efficiency and environmental performance.

    2013 04 v.19 [Abstract][OnlineView][Download 350K]

  • Optimal design of power stations on extension and reconstruction

    WANG Xin(Huadian Coal Industry Group Co.,Ltd.,China Huaneng Group Co.,Ltd.,Beijing 100031,China)

    Taking the extension and reconstruction of power station as research objects,the numerical calculation model of total installed capacity and optimization model of installed sequential are established through Lingo,Mathematic,Matlab and other softwares.In principle the investment is minimum,establish the objective function.Translate the integer programming problem into general programming problem through integer programming ideas.Evaluate the power demand using trend analysis.Optimize the construction sequence and construction time based on the power generating capacity and demand capacity.The results of numerical studies show that,in the first stage,extend the original power plant,install two generating units whose capacity are 10 kW at the beginning of expansion project.In the second stage,build new stations.In the 1.6 year and 2.7 year,separately build a generator sets whose capacity are 25 kW.In the third stage,build new power plants.In the 3.8 year,5.7 year,7.3 year and 8.8 year,separately build a generator sets whose capacity are 30 kW.The optimal design for the renovation and expansion of power station provide a reliable guidance.

    2013 04 v.19 [Abstract][OnlineView][Download 290K]

  • Analysis of coal preparation plant operation modes

    XIONG Tu,QU Zengjie(Guodian Longyuan Power Technology and Engineering Co.,Ltd.,Beijing 100039,China)

    The domestic coal market is strongly influenced by the depressed economy at home and abroad.More and more newly-built coal preparation plants begin to wash coal in order to meet the demands of customers.Investigate and survey the construction and operation modes of coal preparation plants at home.Meanwhile,analyse their merit and demerit.The results show that,the mode of " EPC general contract and specialized management" is the best combination mode for the construction and operation of coal preparation plant,which promotes the project into production as soon as possible.It 's also helpful for sharing sources,simplifying management organization,improving management level,maximizing benefits.There are about 60 percent to 70 percent of newly-built coal preparation plants adopt EPC general contract mode.

    2013 04 v.19 [Abstract][OnlineView][Download 155K]

  • Application of on-line ash indicator in the coal preparation plant of Jining NO.3 coal mine

    GUO Binbin,ZHANG Di,PANG Mingjin(Coal Preparation Plant of Jining NO.3 Coal Mine,Yan Kuang Group Co.,Ltd.,Jining 272069,China)

    There were lots of problems during manual sampling in the coal preparation plant of Jining NO.3 coal mine such as high labor intensity,grave errors,lagging results.To improve the detection precision of commercial coal and reduce labor intensity,meanwhile,better control clean coal production,the coal preparation plant adopts on-line ash indicators.The coal quality deviation between testing result gotten by on-line ash indicator and laboratory result is large,to resolve this problem,the coal preparation plant takes a series of actions such as stabilizing the quality of blending coal and feeding content,adding two kinds of coal blending methods on integrated control interface of blending coal feeding,controlling conveyor belt running.After transformation,the coal preparation plant improves the coal quality and economic benefits,reduces the labor intensity.

    2013 04 v.19 [Abstract][OnlineView][Download 155K]

  • Recovery increasing methods of sublevel caving coal working face

    YAN Weiguo(Ruilong Coal Mine,Shanxi Jizhong Energy Group Mining Industry Co.,Ltd.,Lvliang 033100,China)

    Based on the geological conditions and equipments characteristics of Ruilong coal mine,introduce the recovery increasing methods of sublevel caving coal working face from the aspects of adjusting drawing sequence and interval,installing coal collector,strengthening the recovery of tip sublevel caving coal and the like.The results show that,after transformation,the recovery of sublevel caving coal is more than 85 percent,it provides reference for similar coal mines.

    2013 04 v.19 [Abstract][OnlineView][Download 377K]
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