2013年06期目次

  • Slime flotability in Wangfenggang coal preparation plant

    YANG Lei;XU Chuyang;ZHOU Huanhuan;LI Xingping;School of Materials Science and Engineering,Anhui University of Science and Technology;

    The analysis of slime properties in Wangfenggang coal preparation plant shows that,the average particle size of slime is large,the ash of each size fraction is above 30 percent,which mix evenly with coal.The contact angle is 50.06°,which demonstrates that the flotability is poor.Treated by dodecane or diesel oil,the contact angle increase,the flotability becomes well.If the required ash of clean coal is 14 percent,the theoretical yield of standard concentrate is about 65 percent.The single factor experiment determines when the slurry concentration is 80 g/L,the dosage of diesel oil and fusel is 800 g/t and 128 g/t,the flotation effect is the best,the flotation perfect index is66.94 percent,the ash of clean coal meet the demands and the yield of clean coal is 71.67 percent.Choosing collector,frother and slurry concentration as orthogonal factors,design orthogonal test and investigate the influence of each factor on flotability.The results show that,while the dosage of collector,frother is 1000 g/t and 42 g/t,the slurry concentration is 60 g/L,the flotation effect is the best,under this condition,the yield of clean coal is 71.59percent,the ash of clean coal is 14.30 percent.

    2013 06 v.19 [Abstract][OnlineView][Download 226K]

  • Application of flip-flop screen in Hongliu coal preparation plant

    GE Xianhao;Beijing Huayu Engineering Co.,Ltd.,China Coal Technology and Engineering Group;

    Introduce the principle of flip-flop screen.It has many advantages such as little maintenance amount,high reliability,free of blocking and great adaptability to near-size materials.Introduce the properties of Birtley Screen and Bivitec Screen,conduct the industrial screening test of these two kinds of flip-flop screens,and plot the distribution curves according to experimental results.Compare the screening efficiency and average distribution error.The results show that,the screening efficiency of upper sifter of Birtley Screen is 92.35 percent,while that of Bivitec Screen is 86.01 percent.The screening efficiency of lower sifter of Birtley Screen is 55.70 percent,while that of Bivitec Screen is 76.53 percent.The partition size of Birtley Screen is smaller than classification size,while that of Bivitec Screen is opposite.The average distribution error of both sifters of Birtley Screen is a little higher than that of Bivitec Screen.In general,the screening effects of Bivitec Screen is better in Hongliu coal preparation plant.

    2013 06 v.19 [Abstract][OnlineView][Download 293K]

  • Application of slime dense-medium cyclone in Zhaogezhuang coal preparation plant

    SUN Weidong;Zhaogezhuang Coal Preparation Plant,Kailuan Group Co.,Ltd.;

    Introduce the structure and mechanism of slime dense-medium cyclone.Investigate the properties of coal samples through size analysis,float-and-sink test and partition curve.The results show that the lower separation limit of the cyclone is 0.10 mm when the overflow ash decrease from 17.78 percent to 14.76 percent and the underflow ash is 36.19 percent.The accumulated ash of slime dense-medium cyclone overflow is 9.97 percent which is lower than required.The separation density δp is 1.55 kg/L and ecart probable moyen E is 0.085,the separation efficiency meet the design requirement.The slime dense-medium process runs well since it was introduced in Zhaogezhuang coal preparation plant in 2011.The ash of primary clean coal whose size ranging from 1.00 mm to 0.25 mm decline from 14 percent to less than 11 percent.This change reduces the clean coal pollution and decreases the pulp into flotation system,the separation efficiency ascend to more than 90 percent.Propose some corresponding solutions to solve the following problems,such as poor classification performance for clean coal,noneffective qualified medium regulating system and lagging qualified medium density regulating system.

    2013 06 v.19 [Abstract][OnlineView][Download 207K]

  • Lower size of lump coal reduction measures in Hongqingliang coal preparation plant

    JING Ping;Erdos Haohua Hongqingliang Mining Co.,Ltd.,Beijing Haohua Energy Resource Co.,Ltd.;

    The analysis of coal properties of mines near Hongqingliang coal mine shows that,the raw coal of Hongqingliang is low ash,low sulfur,low phosphorus and medium-high calorific value.Based on the coal properties and products structure,adopt flip-flop screen to separate raw coal,use dense-medium shallow-slot separator to reduce lower size of lump coal.Determine the technological process of Hongqingliang coal preparation plant.Set the classification size of flip-flop screen is 6 mm.The raw coal ranging from 150 mm to 6 mm is separated by dense-medium shallow-slot separator,the products are clean coal and gangue.The slack coal below 6 mm is sold directly.Through separation,the ash of raw coal above 13 mm decrease from 13.54 percent to 6.38 percent,which decrease from 12.86 percent to 6.43 percent while the raw coal ranging from 6 mm to 10 mm.The results show that,the dense-medium shallow-slot separator has great separation ability for 13 mm to 6 mm slack coal.The application of flip-flop screen in Xieqiao and Zhangjibei coal preparation plant is well,the classification efficiency is above 80percent.

    2013 06 v.19 [Abstract][OnlineView][Download 175K]

  • Research status and prospect of lignite upgrading technology in China

    BAI Zhonghua;ZHAO Yubing;HUANG Haidong;YANG Wenhui;ZHANG Xiangzhou;MU Jingjing;ZHANG Peilin;SHI Yawei;Beijing Guodian Futong Science and Technology Development Co.,Ltd.;State Grid Electric Power Research Institute;Hebei Electric Power Corporation;Qinghai Electric Power Design Institute;S.Y.Technology Engineering & Construction Co.,Ltd.;

    Introduce typical lignite drying and distillation upgrading technologies as well as their advantages and disadvantages.Investigate the development situation of Chinese lignite upgrading market and major lignite distillation process,and sum up China lignite upgrading industry's development situation.The number of China lignite upgrading projects have significantly increased from 2008 to 2012,while lignite drying items basically remain stable,and most are used in pithead power plants.The total number and investment of lignite upgrading project appears low point in 2010,while China lignite upgrading project investment grow exponentially after 2011.The major lignite disitillation processes include Guofu lignite upgrading technology,LCC lignite upgrading technology,DG lignite upgrading technology,ZDL lignite upgrading technology and the like.Compare the application status of these technologies.Describe the development trend of Chinese lignite upgrading technology,which is reducing direct combustion consumption,making increased use of lignite upgrading,especially distillation upgrading,improving lignite cascade utilization level,developing large-scale lignite upgrading equipment systems.

    2013 06 v.19 [Abstract][OnlineView][Download 352K]

  • Low-temperature drying characteristics of lignite

    SU Huaixing;HAN Yanna;YOU Bo;SUN Baolin;Arash Tahmasebi;ZHAO Huan;YU Jianglong;Key Laboratory of Advanced Coal and Coking Technology,School of Chemical Engineering and Technology,University of Science and Technology;Thermal Energy Research Centre,Shenyang Aerospace University;

    Lignite reserves are abundant in China,but the high water content greatly limits its exploitation and utilization.The key to solve the efficient use of lignite is dehydration upgrading.The weight loss of HL and YN lignite with different particle size are determined at 50,80 and 110 ℃ for 2 hours by thermal gravimetric analysis( TGA).The results show that the weight loss of coal samples almost doesn't further increase after a period of dehydrate at each drying temperature,and the total weight loss increase with the drying temperature increase,indicating that the bonding strength between the coal surface and the water is different.The energy consumption for evaporation of water and the interaction including the hydrogen bonds and the binding force of microspores with water in coal increase with the water content decrease.The HL lignite,whose particle size ranging from 0.250 mm to 0.150 mm,moisture 26.61percent,is dried at 50 ℃ and the moisture decrease to 6.96 percent in the form of the molecular layer water.When the drying temperature further increase to 110 ℃,the moisture doesn't significantly decrease,which indicate that the hydrogen bond between functional groups and water molecule has strong adsorption for water.After dried at 50 ℃,the residual moisture of 0.150 mm to 0.074 mm,0.074 mm to 0.038 mm and 0.250 mm to 0.150 mm HL lignite is6.52 percent,3.93 percent and 6.96 percent respectively.The results show that,the residual water in 0.250 mm to0.150 mm lignite is pore water,which is trapped in a small space.

    2013 06 v.19 [Abstract][OnlineView][Download 484K]

  • Optimal desulfurization conditions of Acinetobacter to high sulfur coal

    LI Huijuan;ZHAO Cong;DING Rui;SHAO Xianxiang;ZHENG Chenchen;WANG Li;College of Chemical and Environmental Engineering,Shandong University of Science and Technology;

    Using BBD( Box-Behnken Design) method to design experiments,the strain ND( Acinetobacter sp.ND)is used to study the effects of coal concentration,inoculation amount and coal granularity on organic sulfur removal rate from high sulfur coal.The results show that,the organic sulfur removal rate is 71.31 percent after strain ND being cultured for 8 days,under the optimal conditions of 20 percent coal concentration,50 percent inoculation amount( OD600= 1.2) and coal granularity ranging from 0.125 mm to 0.097 mm.The influence degree of each factors on coal desulfurization rate is coal granularity,coal concentration,inoculation amount.Interaction of coal granularity and coal concentration is significant.However,interactions of coal granularity and inoculation amount,coal concentration and inoculation amount are not significant.Comparative results of coal infrared spectra before and after desulfurization show that the change of carbon skeleton in coal is smaller,th e vibration peak of S O and —S—S— bond obviously become weak.

    2013 06 v.19 [Abstract][OnlineView][Download 562K]

  • Application of Yunnan lignite semi-coke in ferrosilicon production

    ZHAO Jiayun;ZHAO Yuewu;Kunming Institute of Coal Science;

    In view of excellent properties of Yunnan lignite semi-coke,which is used to replace 50 percent metallurgical coke to produce ferrosilicon.Investigate the impact of lignite semi-coke particle size,reactivity,ash and other indicators.The results show that,the moisture of feeding lignite semi-coke should be controlled around 10 percent,the particle size less than 4 mm component of semi-coke should not exceed 10 percent,the mass fraction of component ranging from 4 mm to 6 mm should reach about 50 percent.The high reactivity property of semi-coke is favorable to the smelting ferrosilicon,while improving the reduction ratio of Al2O3in ash content which is negative to the75 percent ferrosilicon production,so the ash content in semi-coke should not be over 7 percent.Application tests on mixed semi-coke and metallurgical coke show that,the mass fraction of Al in the product made by mixed coke is2.27 percent on an average.Product rate of ferrosilicon,whose Al content is less than 2 percent is 28.56 percent,down 7.39 percent compared with wholly using metallurgical coke.Using mixed coke,electricity consumption decrease 37 kWh/t,reductant consumption increase 3.2 percent,while lower Al content product drop slightly.All of these indicate partial substitution of lignite semi-coke for metallurgical coke in ferrosilicon production is feasible,and has a certain role in saving energy.

    2013 06 v.19 [Abstract][OnlineView][Download 193K]

  • Determination of total sulfur in coal

    ZHANG Zhipeng;PENG Jingkai;ZOU Zhiyong;Guilin Environmental Monitoring Centre;

    Introduce four methods for total sulfur determination in coal,regulated by national standard,which are Eschka method,heat burning neutralization,coulometric method and infrared method.Compare these methods with five certified reference coal.The results show that,Eschka method achieve high accuracy,the data gotten by Eschka method,coulometric method and infrared method have no significant difference.There is good correlation between measured values and standard values.The measured values gotten by heat burning neutralization are high when determinating low sulfur coal,while the values are low when the coal samples are high sulfur coal.Compare the measuring principle,application scope,adaptable coal,merits and demerits of these methods,provide corresponding measures to minimize measurement errors,such as strictly following the standards when collecting,preparing and measuring samples,reinforceing quality control,checking instruments regular with certified reference coal.

    2013 06 v.19 [Abstract][OnlineView][Download 196K]

  • Poly-generation technology of low-rank coal pyrolysis

    ZHOU Xinliang;College of Chemistry and Chemical Engineering,Taiyuan University of Technology;Hunan Huayin Energy Technology Co.,Ltd.;

    The low-rank coal in Xinjiang Hami is a quality coal with low moisture,ash and sulphur,high volatile.Demonstrate the feasibility of poly-generation technology which is combining pyrolysis upgrading technology with other technologies through coal pyrolysis,semi-coke slurrying,activation and combustion,tar distillation experiments.The results show that,semi-coke has the characteristics of low sulfur and high ash fusibility,which can meet the standards of injection coal.Semi-coke can replace the mixed coal to produce coal water slurry,whose concentration is more than 62 percent,its viscosity,mobility,water repellency are good.After activation,the semi-coke has great adsorption to high concentration coking wastewater,the removal rate of volatile phenol is 99.65 percent,the phenol in wastewater is 2.23 mg/L after treatment.Semi-coke has obvious superiority in reducing emissions of particulate matter and boiler fouling.The volume percent of tar,whose distillation temperature is below 360 ℃,is 48.96 percent,and the volume percent of phenol oil is 15.68 percent.Analyse the economic benefits of this poly-generation technology.The profits is up to 5.2264×108yuan per year by treating low-rank coal using LCC technology.

    2013 06 v.19 [Abstract][OnlineView][Download 267K]

  • Status and development of synthesis of ethylene glycol from coal

    WANG Yuhong;GU Xiaohu;China Pingmei Shenma Group Research Institute of Energy and Chemical;

    Ethylene glycol is an important organic raw material for chemistry industry.It's mainly developed from petroleum.Limited by the energy structure in China,the research of coal to ethylene glycol become urgent.Introduce several main coal to ethylene glycol processes and their merits and demerits.Detail CO catalytic coupling method as well as domestic ethylene glycol supply and demand situation,investment status.The results show that,coal to ethylene glycol industry has cost advantage.To prevent overcapacity,the investment should be intelligent.The development of downstream products is also important,which helps to resist risk.

    2013 06 v.19 [Abstract][OnlineView][Download 272K]

  • Status and development of synthetic natural gas( SNG) from coal

    LI Yao;ZHENG Huaan;ZHANG Shengjun;FU Gang;ZHAO Hexiang;LI Xueqiang;LIU Shuangtai;Shaanxi Coal and Chemical Technology Institute Co.,Ltd.;

    Introduce gasification and methanation technologies,the core links of typical natural gas production from coal.Compare the technological process and technical characteristics of these links.Overview Great Plains Coal Gasification Plant in U.S.and domestic SNG from coal projects construction situation.Due to the necessity and urgency of developing this kind of project,provide suggestions for domestic ones.

    2013 06 v.19 [Abstract][OnlineView][Download 533K]

  • Quality control of total sulfur determination in fule coal

    ZOU Zhiyong;DU Juan;PENG Jingkai;ZHANG Zhipeng;KANG Xingkuai;Guilin Environmental Monitoring Center;

    Based on the quality control theory and practical experience of total sulfur determination in coal,provide that the accuracy of total sulfur data is influenced by quality monitors,sample collection,sample transportation and storage,monitoring instruments,laboratory environment and the like.Introduce the quality control process of total sulfur determination in fuel coal by Guilin Environmental Monitoring Center.The results show that,the precision and accuracy of total sulfur determination in fuel coal of Guilin reaches the national standards,which guarantees the representativeness,integrity,precision,accuracy and comparability of monitoring data.

    2013 06 v.19 [Abstract][OnlineView][Download 216K]

  • Design of dust covering agent automatic spraying system in coal railway transportation

    LIU Li;DONG Zhen;CAI Juexian;DONG Bo;LI Yingquan;Datong Tielian Industrial Co.,Ltd.;School of Environmental & Municipal Engineering,Lanzhou Jiaotong University;Traffic Transportation Dust Controlling Engineering Technology Research Center in Gansu Province;Ecological Environmental Protection Material Engineering Lab in Gansu Province;

    The open train model is the main coal railway transportation,which brings serious dust pollution to railways.To solve this problem,develope a new type of environmental protection dust covering agent and its automatic spraying system.The system can prepare dust covering agent automatically,meanwhile,online monitor the concentration,viscosity,conductivity,temperature data of covering agent.The spraying amount is regulated automatically according to the train speed.The spraying process can operate well while the train is running.The system applies to different kinds of C type train,it also can identify automatically traction locomotive and mixed train.The system has lots of advantages,such as simple operation,stable running,high automation,low cost and effective.This technology realizes its industrial application in coal railway transportation.

    2013 06 v.19 [Abstract][OnlineView][Download 267K]

  • Current situation of comprehensive utilization of fly ash

    WU Yuanfeng;YI Guiyun;LIU Quanrun;LI Fenghai;ZHAO Liwei;MA Mingjie;School of Materials Science and Engineering,Henan Polytechnic University;Department of Chemistry and Chemical Engineering,Heze University;Dagang Oilfield Petroleum Engineering Research Institute;

    Fly ash emissions increase year by year with the increase of coal utilization.According to the Grey Forecast Model,its domestic emissions will reach 9×108tons by 2020.The rational utilization of fly ash is of great significance.Based on the analysis of physical and chemical properties of fly ash,classify the utilization methods of fly ash,detail each method from the aspects of agriculture( soil improvement,fertilizer),building materials( concrete,brick,cement,mortar,ceramsite,foam glass,gouache),chemical industry( extracting aluminum,synthesis of molecular sieves,rubber and plastic composite materials,paper production),environmental protection( wastewater treatment,flue gas purification).At last,put forward some suggestions on the development of fly ash utilization.

    2013 06 v.19 [Abstract][OnlineView][Download 2232K]

  • Thermal efficiency of vibrating bed mixed flow drying system

    WU Zike;Chongqing Research Institute of China Coal Technology & Engineering Group Corp.;

    The vibrating bed mixed flow drying system,which is used to reduce moisture of lignite and improve its calorific value,is composed of hot air system,drying system and dust removal system.Since this is a new drying system,it's need to test and calculate its thermal efficiency.By changing coal flow,measure the temperature,humidity,air volume of inlet and outlet of drying system,meanwhile determine the moisture and calorific value change of coal samples.Using Entropy-enthalpy calculation method,get the theoretical air volume for different coal flow.Investigate the thermal efficiency of drying system by comparing theoretical and experimental air volume.Find the direct cause affected drying efficiency and corresponding improvement measures,which provide theoretical basis for the vibrating bed mixed flow drying system transformation.

    2013 06 v.19 [Abstract][OnlineView][Download 274K]

  • Application of pre-desliming and non-pressurized feeding separating process in Xinzhuang coal preparation plant

    YIN Mao;Xinzhuang Coal Preparation Plant,Hennan Shenhuo Group;

    Introduce the problems existed in dense-medium separation system after Xinzhuang coal preparation plant transformation.Compare the advantages and disadvantages of two kinds of solutions.Based on existing technological characteristics,equipments layout,raw coal washability and transformation costs,adopt pre-desliming and non-pressurized feeding separating process.Analyse the separation density,recovery efficiency,medium in product,desliming effects,economic benefits after transformation.The results show that,the process increases profits more than 7.8 ×106yuan for the plant.The transformation provides reference for other coal preparation plants.

    2013 06 v.19 [Abstract][OnlineView][Download 231K]

  • Application of high quality dense-medium on clean coal recovery improvement

    YU Haiqing;CHEN Rong;YAN Ruya;Chengde Sanjia Magnetite Powder Co.,Ltd.;Liupanshui Weiqing Coking Co.,Ltd.;

    To push dense-medium coal preparation plant to pay more attention to medium quality not just attracted by low price,investigate the relationship between medium quality and clean coal recovery from the practice.Analyse the influencing factors of clean coal.Judge the medium consumption by strengthening medium quality management,assessment system,four-level censorship,equipment book account system,reward and punishment system.Meanwhile,strengthening the management of technology can help to reduce the cost and increase benefits.

    2013 06 v.19 [Abstract][OnlineView][Download 180K]



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