2014年06期目次

  • Status and development direction of lignite dehydration upgrading technologies

    SHANG Qingyu;Energy Conservation and Engineering Technology Research Institute,Coal Science and Technology Research Institute Co.,Ltd.;State Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute);National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control (China Coal Research Institute);

    In order to use lignite reasonably and efficiently and reduce the environmental pollution,the paper introduced the status of lignite dehydration upgrading technologies at home and abroad,discussed the development of corresponding industrialization demonstration projects.The results showed that,the treatment dehydrated most of the lignite moisture,improved the calorific value,increased the added value,made the transportation,storage and comprehensive utilization more convenient.There were still lots of problems during treatment,such as large flue dust emission,high energy consumption,difficult waste heat recovery,low briquetting rate.After briquetting,the briquette blast into pieces easily.In order to resolve these problems,the paper provided the improvement measures from strengthening basic theoretical research of lignite properties and dehydration,drying process and equipment development,products utilization affer lignite drying.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 110K]

  • Experimental study of dry preparation of moist lignite

    WEI Lubin;LI Dahu;ZHU Xueshuai;LIU Peng;ZHANG Yu;School of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing);

    In order to improve the adaptability of air dense medium fluidized bed on different coal moisture,the hot air was blown to the fluidized bed instead of the air at ordinary temperature,so the lignite can be separated efficiently.The effects of drying temperature,drying time and air flow in fluidized bed were investigated with ecart probable moyen Ep.The results showed that when the drying temperature ranged from 30 ℃ to 50 ℃,the higher the drying temperature,the lower the value of Ep.When the drying time were between 1 minute and5 minutes,the longer the drying time,the lower the value of Ep,and Epdecreased slowly after drying 3 minutes.When the air speed were between 8 m3/ h and 12 m3/ h,Epreduced first,then rose with air speed increased.The higher surface moisture of the coal sample,the more significant influence of drying temperature and time,air volume on Ep.The Epwas 0.022 g / cm3 when the drying temperature was 50 ℃,the drying time was 5 minutes,and the air flow for coal sample of 1% surface moisture were 10 m3/ h.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 236K]

  • Experimental study of supercritical ethanol deoxygenation of Shengli lignite

    ZHOU Jianming;HU Xiuxiu;WANG Yiwei;RAO Tianxi;XU Deping;Energy Conservation and Engineering Technology Research Institute,Coal Science and Technology Research Institute Co.,Ltd.;State Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute);School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing);

    In order to remove the oxygen-containing functional groups in lignite,the Shengli lignite was treated through supercritical ethanol process.The influence of the temperature,residence time and ratio of ethanol and coal on the deoxygenation was researched.The FT-IR and GC / MS were used to characterize the solid and liquid products.The results showed that the optimal deoxygenation condition of supercritical ethanol deoxygenation was temperature 270 ℃,residence time 90 minutes and the mass ratio of alcohol to coal 5∶ 1,and the total oxygen content was 9.29%,the deoxygenation rate was 61.40%,the solid yield was 89.62%.In the liquid product which was obtained at 220 ℃,the content of aromatic compounds was about 80%,the content of phenols and ester compounds was less than 5%,the other oxygen-containing compounds was 11.29%.However,in the liquid product which was obtained at 270 ℃,the content of aromatic compounds was decreased by 31.69%,the volume fraction of oxygen containing compounds was increased by 2.81%,the content of phenols and ester compounds was increased to about 35%.Ether oxygen bonds were broken up during supercritical ethanol,there were large amount of phenolsin in which phenol and its derivatives were the main components and esters,mainly ethyl esters in liquid products.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 170K]

  • Preparation of nickel-loaded on Shengli lignite catalysts for catalytic gasification of biomass

    BIAN Yue;XU Baoshan;WANG Benshui;CAO Jingpei;ZHAO Xiaoyan;WEI Xianyong;School of Chemical Engineering and Technology,China University of Mining and Technology;

    In order to prepare low price and high active catalyst for biomass tar pyrogasification,based on the rich oxygen-containing species in lignite,a kind of novel catalyst was prepared by loading nickel on Shenli lignite char via ion-exchange.The effects of solution p H and carbonization temperature on the physic-chemical properties of catalyst was studied.The research determined the optimum operation condition of Ni / SLC catalyst.Then the catalyst was used in two-stage moving-bed gasification of corn cob in quartz tube reactor.The influence of catalyst on gas yield and carbon balance was investigated.The results showed that,the catalyst prepared in the p H of 11 at 650℃ reached the maximum SSA of 266.3 m2/ g and the nickel particles dispersed quite well in the catalyst with the NCS of 5.0 nm.It effectively improved tar decomposition at 650 ℃ under inert atmosphere and produced a tar-free syngas in a yield of 43.9 mmol / g,which were 3.3 times of the total gas yield without catalyst.The gasification of coal tar with steam was thorough.The gas yield were 85.1 mmol /g,the H2 yield were 61.9 mmol / g,which were 72.7% of the total gas yield.So the Ni / SLC catalyst was suitable for the gasification of biomass.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 480K]

  • Preparation of coal water slurry for gasification with lignite

    DUAN Qingbing;ZHANG Shengju;HE Guofeng;LIU Yewei;SUN Haiyong;Energy Conservation and Engineering Technology Research Institute,Coal Science and Technology Research Institute Co.,Ltd.;National Coal Water Mixture Engineering Technology Research Center;State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute);National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute);

    In order to improve the concentration of coal water slurry(CWS) for gasification with lignite,the slurryability of three coal samples which were provided by an chemical enterprise was conducted through traditional CWS preparation process and classified grinding process.Then the CWS preparation with blending coal was carried out.The results showed that,prepared by traditional process,the highest pulp concentration of Dongming coal,Zhalainuoer coal,Baokuang upgrading coal were 48.54%,51.76%,56.08%.Prepared by classified grinding process,the highest pulp concentration of above three CWS were 51.72%,54.82%,59.21%,which were above 3% higher than the concentration of CWS prepared by traditional process.When the mass ratio of Dongming coal and Zhalainuoer coal was 1 to 1,or the mass ratio of Dongming coal and Baokuang upgrading coal was 2 to 1,the concentration of CWS were 53.12% and 54.21%,which met the design requirements.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 97K]

  • Upgrading of lignite by fluidized bed

    ZHAO Zhenxin;WANG Yongsheng;ZHU Shuquan;School of Chemistry and Materials Engineering,Henan University of Urban Construction;Henan Energy and Chemical Industry Group Co.,Ltd.;School of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing);

    The lignite has the disadvantages of high moisture,low calorific value and easy spontaneous combustion.The essay took lignite in Inner Mongolia as object,carried out the lignite static drying test and upgrading multi-factor test.Taking the flue gas in which the O2 volume fraction was 10.5% as drying medium,the serial experiments of fluidized bed upgrading based on the analysis of fluidized bed upgrading principle were conducted.The results showed that,the optimum moisture was around 5%.When the lignite size was below 3 mm,the temperature affected the drying rate most,followed by lignite size and air speed.The paper determined the critical fluidized air speed for total size fraction,0.5 to 1.25 mm,1.25 to 2 mm,2 to 3 mm was 38,20,40,50 m3/ h respectively.The optimum upgrading temperature and time was 200 to 240 ℃ and 5 to 8 minutes.At last,an upgrading model was built which had a guidance function to lignite upgrading.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 227K]

  • Influence of temperature on pyrolysis properties of low rank coal

    SHANG Tiecheng;Beijing Research Institute of Coal Chemistry,Coal Science and Technology Ressarch Institute Co.,Ltd.;State Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute);National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control (China Coal Research Institute);

    In order to get high quality and yield coal tar,taking Yulin long flame coal as research object,the paper investigated the products yield,char strength and coal tar properties under different prolysis temperature using 1 kg / h external heated rotary furnace.The results showed that,the rising temperature aggravated the pyrolysis,the gas and liquid products yield increased,the char yield decreased.With the rise of temperature,the yield of water yield increased slightly,the char structural strength and aperture also raised.The higher the temperature,the better-developed pore structure.The aliphatic and aromatic content were proportional to the temperature,while the polar composition was inversely proportional to the temperature.The optimum prolysis temperature was 600 ℃ for long flame coal,the maximum coal tar yield was 8.66%,which was 79.5% of Gray-King yield.The semi-coke strength was greater than 78% when the polar composition was 32.9% and the aliphatic and aromatic content was more than 50%.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 216K]

  • Preparation and adsorption of activated coke made from low rank coal

    MIAO Wenhua;WU Peng;TENG Jilin;Beijing Guodian Futong Science and Technology Development Co.,Ltd.;Stated Grid Electric Power Research Institute;

    In order to solve the problems of coal chemical waste water treatment and improve the adsorption of activated coke,taking five typical low rank coals as research objects,the activated coke was prepared through carbonization and activation processes on rotary furnace.The effects of activation temperature,reaction time and amount of steam on activated coke properties were studied.The adsorption capacity of different activated coke was analyzed.The results showed that,when the activated coke was prepared from lignite,the optimum activation temperature was 800 ℃,the reaction time were 3 hours,the steam were 1050 g.When the raw material was candle coal,the best temperature was 850 ℃,the reaction time was 4 hours,the steam were 1200 g.Under the optimal condition,the adsorption of activated coke prepared from lignite were 36.32 mg / g which were 10% higher than that of activated coke prepared from the candle coal.The surface area of activated cokes had no significant correlation to the adsorption.The bigger the pore volume,the higher the adsorption.The two parts aperture ranging from 2 nm to 5 nm,5 nm to 20 nm led to different adsorption of activated coke.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 245K]

  • Research status and development proposals on pyrolysis techniques of low rank pulverized coal

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

    The research progress and characteristics of the domestic and international mainstream pulverized coal pyrolysis upgrading technologies were introduced in details in order to improve the quality,economy and security of low rank coal.The technical problems existed were analyzed and developing suggestions were proposed for the low rank pulverized coal pyrolysis upgrading technology.The results showed that it was one of the key technologies to use solid heat carrier pyrolysis process for pulverized coal utilization,which have the advantages of high heating speed,high tar yield and calorific value.Due to the issues such as key technical deficiency,low economic efficiency,big tar quality fluctuation and difficult waste water treatment,the research in future should focus on the fields of key technical breakthrough,pyrolysis reactor optimization,pyrolysis products deep processing and utilization,tar yields and tar quality improvement,tar separation and recovery technology,organic waste water treatment and poly-generation technology with high energy conversion efficiency.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 322K]

  • Sulfonation and characterization of lignite humic acid

    WU Hongyun;GAO Lijuan;YANG Xiaoying;ZHAO Xuefei;YANG Xiuling;School of Chemical Engineering,Liaoning University of Science and Technology;

    In order to improve the hydrophilicity of humic acid,the lignite humic acid was modified by sulfonated method.Taking Na2SO3 as sulfonatingagent,sulfonation degree as index,the influence of humic acid-sulfonating agent ratio,reaction time,temperature on acid sulfonation degree was studied through the single factor experiment and orthogonal design method.The authors got the optimum preparation condition,meanwhile,characterized the humic acid through infrared spectrum analysis and thermogravimetric analysis(TGA).The results showed that,the reaction temperature was the main influencing factor,followed by reaction time,humic acid-sulfonating agent ratio.When the sulfonating agent-humic acid ratio was 2 to 20,the sulfonation temperature was 50 ℃,the reaction time was 90 minutes,the sulfonation degree was 17.72%.The IR spectra showed that the modified humic acid contained benzene ring,carboxyl,hydroxyl,phenolic hydroxyl group.Its sulfo groups increased significantly.The TGA showed that,the sulfonatedhumic acid was stable when the temperature was lower than 200 ℃,while the temperature was higher than 200 ℃,the sulfonatedhumic acid began to deposit.When the temperature was lower than 330 ℃,the deposition was endothermic reaction,otherwise,the deposition was exothermic reaction.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 264K]

  • Combustion characteristics of Inner Mongolia lignite semi-coke

    ZHANG Qingwei;SHEN Baohong;QU Sijian;XIE Qiang;School of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing);Beijing Research Institute of Coal Chemistry,Coal Science and Technology Research Institute Co.,Ltd.;State Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute);

    In order to use Wulagai lignite(Inner Mongolia) efficiently,taking-6 mm Wulagai lignite as raw material,the test prepared the Wulagai lignite semi-coke in muffle which was used to simulate the industrial carbonization furnace.Then the proximate analysis,calorific value,grindability index,combustion dynamics of semi-coke,relationship between pyrolysis condition and semi-coke combustion characteristics were researched.The results showed that,the final temperature of pyrolysis was the main influencing factor,the influence of heating rate and holding time ware not significant.The reaction activity of semi-coke improved with the rise of final temperature and heat preservation time,while the influence on combustion characteristics index was opposite.The semi-coke which was obtained at 600 ℃ pyrolysis had superior calorific value of 24.50 MJ / kg which was 77% higher than that of raw coal.The combustion characteristics index were1.4 × 10-7%2/(min2·℃3),the suitable fuel ratio R ranged from 7 to 9,which was a fine fuel.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 602K]

  • Experimental study of hot-pressing dehydration of lignite

    ZHENG Xing;OUYANG Congcong;YE Ziming;ZENG Ming;School of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing);

    In order to improve the dehydration rate of lignite,taking Xilingol lignite as research object,lignite hot-pressing dehydration experiments were carried out under different conditions using high temperature reactor.The paper studied the effects of temperature,pressure and pressure preservation time on the lignite dehydration rate.Nitrogen adsorption static tester was used to analyze pore structure of coal samples before and after the test.The results indicated that when the temperature was 250 ℃,the pressure was 3 MPa and pressure preservation time was 60 minutes,the dehydration rate could reach to 93.67%.With the interaction of pressure and thermal,the increasing pressure compressed the carbon skeleton of lignite,squeezed the inherent moisture,changed the pore structure and distribution.After dehydration,the specific surface area of lignite,total pore volume and average aperture decreased by 0.70192 m2/ g,0.00405 cm3/ g,1.38593 nm,the distribution of aperture was changed significantly,the addition of micropore and mesoporous were 5.57% and 4.97%,the decrement of macropore was 10.54%.The test showed that the hot-pressing was suitable for lignite dehydration.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 180K]

  • Preparation of high mechanical strength bituminous briquette with modified humic acid

    ZHENG Keli;NIU Yu;OU Yangying;College of Resources and Chemical Engineering,Sanming University;

    In order to improve the mechanical strength of bituminous briquette,the modified humic acid was adopted as binder.The influence of heating time and temperature,mass fraction of Na OH,humic acid addition on compressive strength and dropping strength of briquette was investigated through the single element experiment and orthogonal experiment.The results showed that the modified briquette had better mechanical strength,the briquetting ratio of fine coal was high.The main influencing factor was humic acid addition,followed by mass fraction of Na OH,heating time and temperature.The optimum technological condition was that the heating time was 130 minutes,the mass fraction of Na OH was 6%,the heating temperature was 90 ℃,the addition of modified humic acid was 15%.Under the optimum condition,the compressive strength and dropping strength of briquette was 1620.2 N,99.0%.The bituminous briquette bonded by modified humic acid was suitable for industrial production.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 224K]

  • Production techniques and process of low rank coal water slurry

    WEI Yaling;MENG Xianliang;TAO Eryu;ZHAO Zhongxi;School of Chemical Engineering and Technology,Yinchuan College,China University of Mining and Technology;School of Chemical Engineering and Technology,China University of Mining and Technology;

    China is abundant in low rank coal which is very difficult to made into coal water slurry(CWS).This paper first introduced the advanced CWS preparation technologies.In order to obtain high quality low rank CWS for industrial application,the following factors should be taken into consideration,the coal properties,grinding,modification and coal blending techniques,additives.The CWS preparation technologies could utilize low rank coal efficiently,they were also suitable for the Chinese national condition.The research and development of low rank CWS had a wide range of application in environmental protection and energy utilization.At last,the authors looked forward to the prospects of low rank CWS preparation.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 134K]

  • Separation characteristics of fine coal in hindered fluidized bed with perforated plate

    WANG Zenan;TANG Ligang;Changcun Coal Mine,Shanxi Lu'an Environment and Energy Co.,Ltd.;Coal Mining and Designing Department,Tiandi Science & Technology Co.,Ltd.;

    In order to increase the separation performance of normal hindered fluidized bed for fine coal,the perforated plates were designed in this work.The separation characteristics of fine coal in the bed with perforated plate were investigated using a combination of experimental and numerical simulation methods.The results showed that the perforated plate were beneficial for the uniformity of separation density of each particle size range.The slope of particle size-separation density curve was increased from-0.518 to-0.448.The density separation of particles and separation performance were increased.The high-density particles(1.70 and 1.90 g / cm3) distributed at the bottom of bed.Their volume fractions were 29.79% and 32.86% respectively.The low-density particles(1.40 and 1.50 g / cm3) distributed at the upper of bed.Their volume fractions were 48.90% and 20.81% respectively.The misplaced particles were less,so the coal particles can be separated effectively.Furthermore,the density of suspension zone of bed wasn't the separation density.The fluidization density was 1.23 g / cm3 which was uneven along the height direction.The multi-stage separation model,including perforated plates,flluidized zone among plates and the bed wall could inhibit the mismatch of high-density and low-density particles,meanwhile,separate the fine coal effectively.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 286K]

  • Experimental study of flotation concentrate dehydration using filter aids

    REN Jianmin;LIU Lei;FAN Hegao;Jiaozuo Coal Co.,Ltd.,Henan Coal Chemical Industry Group Co.,Ltd.;School of Chemical Engineering and Technology,China University of Mining and Technology;

    In order to decrease the moisture of flotation concentrate in Zhaogu NO.2 coal preparation plant,the authors added filter aids to the flotation system.Then the selection test and quantitative test were conducted.The selection test showed that the liquid filter aid was better than the solid filter aid in reducing the moisture and shortening the filtration time,so selected the liquid filter for quantitative test.The quantitative tests showed that the liquid filter aid TLT5140 was the best.The moisture could be reduced to 16.5% when the dosage was 80 g / t(dry flotation concentrate).Based on the experimental results,the TLT5140 was selected finally for industrial test.Compared with the flotation concentrate which was produced without filter aids,the moisture of flotation concentrate which was treated by filter aid could be decreased by 3%.The unloading cycle of pressure filter was shortened by 50% as well.The filter aid decreased the moisture of flotation concentrate,improved the production capacity of filtration equipment,met the customers requirements.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 93K]

  • Transformation of flotation system in Tunlan coal preparation plant

    ZHAO Xiaohong;Tunlan Coal Preparation Plant,Xishan Coal Electricity Group Co.,Ltd.;

    In order to improve the separating effects of flotation system and increase clean coal recovery,meanwhile,reduce the waste of coal resources caused by high ash coal.The paper analyzed the causes of low ash of flotation tailings,low separation efficiency,high flotation agent consumption and mass bubble in flotation clean coal pool.The renovation project scheme was put forward,the scheme was demonstrated.The results showed that,the updating of XJM-12 flotation machines improved the flotation concentrate yield and floating tail ash effectively,which could greatly saved the consumption of reagent and electricity.The transformation saved the production cost and the economic benefits increased by RMB 4.20986 × 107.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 88K]

  • Analysis of sulfur in coal with Near Infrared Spectroscopy

    ZHENG Zhong;Tunlan Coal Preparation Plant,Xishan Coal Electricity Group Co.,Ltd.;

    In order to investigate the sulfur in coal,the authors collected the near-infrared diffuse reflection spectrum from 120 coal samples,the mathematical model which introduced partial least squares regression(PLSR) combined with different spectrum pretreatment methods were established.Then the paper compared the model with industrial detection.The results showed that,the PLSR modeling of sulfur by 5 points smooth had better effects.The root mean square error of calibration(RMSEC) and root mean square error of prediction(RMSEP) were 0.0406 and 0.0423,with correlation coefficients of 0.89695 respectively.The results indicated that the model had high relevance,stability and accuracy.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 183K]

  • Measures of improving clean coal yield in Tianzhuang coal preparation plant

    LI Maogang;Tianzhuang Coal Preparation Plant,Pingdingshan Tianan Coal Industry Co.,Ltd.;

    In order to improve the clean coal yield,the problems with the equipment and process of Tianzhuang coal preparation plant are analyzed.The coarse slime system,flotation system and slack coal treatment system were transformed.The specific measures were as follows.The water from coarse slime desliming sieve to coarse slime separator was diverted.The raw material barrel of separator with pyramid pool which was improved constantly was replaced,a current stabilizer and an overflow groove were installed,the coal water mixture distribution barrel was optimized,a regulator was added,the feeding pipe of coarse slime square pool and sprinkler system of coarse slime sieve were transformed,the feeding size of dense medium cyclone was homogenized.After transform,the yield of feeding ranging from 0.50 mm to 0.25 mm was increased by 3.27%,the yield of feeding below 0.25 mm was decreased by 2.94%.After transformed,for flotation system,the ash of clean coal was decreased by 0.43%,the clean coal yield and recovery efficiency were increased by 6.01% and 0.21%.After treated by dense medium cyclone,the clean coal yield and recovery efficiency were increased by 6.15% and 3.61%.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 177K]

  • Design and calculation of semi-automatic overturning sieve bend

    HAN Chunsheng;LI Xiaole;SUN Jieyi;Tangshan Research Institute,China Coal Technology and Engineering Group;Coal Separation Engineering &Technology Research Center of Hebei Province;Ministry of Basic Teaching,Tangshan College;

    In order to improve the overturning efficiency of sieve bend,the sieve bend mas transformed by adopting the electro-hydraulic putter as driving device.The sieve bend box was ruffled and flatted by changing the length of electro-hydraulic putter.The box realized the automatic pitching function and most of the original structure of sieve bend was preserved.Variation curves of the drive force in the pitching rotation process were obtained through theoretical calculation and simulation.The results showed that,the theory curve of electro-hydraulic putts driving force were consistent with the simulation curve.In the overturning process,the maximum driving force was required to start at level posture,with the screen box erected angle α becomed larger,the driving force required for electro-hydraulic putter reduced accordingly.Consider the calculation error and a certain safety factor,the rated maximum thrust of the electro-hydraulic putter Fmax was 15000 N.After transformation,the curved screen achieved a semi-automatic overturning as a joint result of manual operation and mechanical drive.The overturning time was shortened from 2 h to 10 min and effectively improved the effects of dehydration,demedium and desliming.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 283K]

  • Application of control operating system in Xiegou coal mine preparation plant

    QIU Guanglei;Shanxi Xishan Jinxing Energy Co.,Ltd.,Xiegou Coal Mine Preparation Plant;

    The Xiegou coal mine preparation plant had the characteristics of large raw coal handing capacity,lots of equipments and major fluctuations of raw coal properties.In order to improve the automation degree of coal preparation plant,strengthen the control over the preparation,promote the safety and efficient,ensure qualified and stable product index,the preparation plant adopted a control operating system.The paper introduced its configuration,functionality realization and adjustment in the production process.The qualification rate of clean coal and mixed coal were 100%,the medium consumption were 1.41 kg,the energy consumption were 6.51 k Wh for per ton raw coal in the first half of 2014.The indicators showed that the operation method fully met the requirements of process and it also accommodated to the change of raw coal properties.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 106K]

  • Problem analysis and improvement measures of high coal slime water concentration

    NING Shimao;Tunlan Coal Preparation Plant,Xishan Coal Electricity Group Co.,Ltd.;

    Coal slime water concentration was the main factor affecting the medium drainaging and clean coal quality,it also played important role in guiding flotation.In order to decrease the coal slime water concentration in Tunlan coal preparation plant,this paper analyzed the production flow.The results showed that,poor recycling effects of high frequency vibrating screen,unreasonable flocculant addition,large water from concentrated machine,leakage of coarse slime through the sieve plate and sieve basket of dense medium system were the main influencing factors.To resolve the above problems,the author prepared 0.1% flocculant by adjusting the electriccurrent of overflow ranging from 280 A to 310 A,decreased the equipment bottom coal thickness and other technical schemes.After transformation,the concentration of coal slime water was below 13 g / L,the products yield were improved.The transformation saved the energy and decreased the pollutant emissions.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 87K]

  • Critical properties of narrow fractions from coal-derived oil-Part(Ⅱ) Pseudo-critical pressure

    ZHU Xiaoman;MAO Xuefeng;ZHANG Xiaojing;SHAN Xiangen;ZHANG Xuwen;ZHAO Yuan;Beijing Research Institute of Coal Chemistry,China Coal Research Institute;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources (China Coal Research Institute);Shanghai Research Institute,China Shenhua Coal to Liquid and Chemical Co.,Ltd.;

    In order to investigate the applicability of pseudo-critical pressure(PCP) empirical correlation in Shenhua coal-derived oil which was obtained from the continuous direct coal liquefaction test,eight narrow fractions were gained by the true boiling point distillation from the samples,of which boiling point was lower than 300 ℃.The PCP calculated by group contribution method(GCM) ascend with distillation temperature rising between 110 ℃ and 200 ℃ fractions,while the PCP descend between 200 ℃ and 300 ℃ fractions.The PCP calculated by different equations were compared with values by GCM,and the results of the ZHOU Peizheng equation were better than else equations with relative error within 5%,excepting 150 ℃ to 180 ℃,180 ℃ to 200 ℃ and 220 ℃ to 240 ℃ fractions.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 178K]

  • Development suggestions for coal to ethylene glycol in domestic

    LI Xueqiang;ZHENG Huaan;ZHANG Shengjun;CHEN Jingsheng;LI Yao;MIAO Qing;ZHAO Hexiang;ZHANG Jianbo;Shaanxi Coal and Chemical Technology Institute Co.,Ltd.;

    In order to make rational use of coal and reduce the risk of coal to ethylene glycol,meanwhile,increase the ethylene glycol yield,this paper introduced the technological process of ethylene glycol synthesis by indirect method and its industrialization first,then analyzed the proposed and under construction coal to ethylene glycol projects at home.There were technological and market risk.At present,there were no catalysts having long-period and stable operation instance,the products quality varied,the productivity of reactor was low and the industry chain was short.Taking one coal to ethylene glycol project as research object,the cost and benefits were calculated.If both of per ton of feed coal and fuel coal was RMB 450,then the cost of coal to ethylene glycol and traditional oil to ethylene glycol was RMB 5403.62 and 6300 per ton.So the coal to ethylene glycol had good prospect.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 115K]

  • Application of SH2010 internal heated retort in lignite dry distillation

    SHI Jianpeng;XUE Xuanping;ZHAO Jie;HU Changlan;CHEN Xiaofei;TIAN Pengjun;XIE Jianfeng;Shaanxi Metallurgical Design and Research Institute Co.,Ltd.;

    In order to utilize lignite effectively,Shaanxi Metallurgical Design and Research Institute Limited Company developed lignite dry and distillation process.This paper introduced the working principle and process of vertical dryer and SH2010 internal heated retort.Then the processes of dry distillation gas purification and coal tar recovery were analyzed.In order to reduce the possibility of explosion causing by the contact of lignite and high temperature oxygen-rich flue gas in dryer,an anti-explosion board should be installed at the top of dryer and the lignite size shouldn't be larger than 150 mm.The SH2010 internal heated retort had better effects and improved the calorific value of lignite.The subsequent matched purification equipment recycled most of the coal tar and coal gas.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 284K]

  • Research progress of organic solvent extraction of low rank coal

    YIN Jia'nan;ZHANG Fengtong;FAN Lihua;LIANG Yinghua;WANG Lei;College of Chemical Engineering,Hebei United University;

    Organic solvent extraction for low rank coal research had developed rapidly,this paper compared the low temperature extraction with high temperature extraction,then discussed the corresponding extraction mechanism,influencing factors and the application of extracts.The results showed that,the extractions which were operated below 200 ℃ were mostly low temperature physical extraction and the extraction rate was low,the extracts were used for the study of molecular structure of coal.The extractions which were extracted at 300 ℃to 400 ℃ were high temperature solvent extraction,the extraction rate was higher,the extraction process was accompanied by chemical bonds breakage and chemical reactions,the extracts were used in blending coal coking,low quality coal gasification and liquefaction,new coal-based materials preparation.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 115K]

  • Preparation and catalytic activities of Lanthanum strontium manganite based catalysts supported on honeycomb ceramics

    LU Guizeng;LEI Ze;ZHAO Haoying;SONG Wenwan;HAN Minfang;School of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing);Research Center of Fuel Cell on Coal Gasification;

    Cordierite Honeycomb ceramic supporters were treated by different concentrations of oxalic acid and nitric acid respectively.The effects of acid treatment on weightlessness rate,water absorption rate and compressive strength of the supporters were investigated.Cordierite Honeycomb ceramics supported Lanthanum strontium manganite based La0.8Sr0.2Mn0.4Al0.4Zn0.2O3-δ(LSMAZ) catalysts were prepared by a catalyst powder slurry coating method.The resultant monolithic catalysts were characterized by X-ray powder diffraction(XRD),field emission scanning electron microscopy(FE-SEM).The catalytic performance for methane combustion was conducted in a tubular reactor.The results showed that acid treatment increased the specific surface area and water absorption of the supporters.Under the same condition,the erosive effect of oxalic acid on the supporters was better than that of nitric acid.The erosive effect was promoted with the increase of the oxalic acid concentration.However,the excessive concentration of acid weakened the compressive strength of the supporters,which were not used anymore.By calcining at 1050 ℃ for 5 hours,the resultant monolithic catalyst possessed moderate failure rate and insignificant interface reaction between support and LSMAZ,therefore,it also gave the highest catalytic activity for methane combustion.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 338K]

  • Coking waste water treatment by combined method of DAF+MSBR

    ZHU Yugao;Yan'an Vocational and Technical College;

    In order to make the NH3-N content in coking waste water meet the discharge standards,taking the waste water in a coking plant in Yulin as research object,the author studied the treatment effects of DAF(dissolved air flotation) + MSBR(modified sequencing batch reactor) combined process.The results showed that the average concentration of influent CODcr,NH3-N,volatile phenol,CN,SS were 1490 mg / L,200 mg / L,176 mg / L,CN average concentration of 17 mg / L,580 mg / L.The processing time of the DAF and MSBR was3 and 9 hours.After treated by the DAF + MSBR process,the average concentration of influent CODcr,NH3-N,volatile phenol,CN,SS were 74.3 mg / L,10 mg / L,0.25 mg / L,0.09 mg / L,30 mg / L,so the removal rate was 93.8%,95%,99.8%,99.4% and 94.8%.The pollutant in waste water met the Coking Chemical Industry Emission Standards.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 298K]

  • Application of residue produced from coal associated oil shale retorting

    BAI Shuxia;CHU Mo;LI Xiaocong;LI Xiong;LI Bin;CAO Wenhan;School of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing);

    The solid waste which is produced in oil shale pyrolysis is oil shale residue,accounting for approximately 80% to 90% of oil shale mass.The resource utilization of coal-derived oil shale residue had become the bottleneck of oil shale pyrolysis industry due to its low utilization rate and increasing yield.This paper investigated the situation of oil shale pyrolysis and the application of residue in waste water and waste gas treatment.The results showed that,the single utilization of oil shale residue restricted its further use.Combined with its special composition and structure,this paper put forward that the oil shale residue could be used as environmental material such as adsorbent.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 94K]

  • Research progress of coal-fired flue gas simultaneous desulfurization and denitrification

    KANG Xinyuan;Taixi Coal -based Industry Co.,Ltd.,Shenhua Ningxia Coal Industry Group;

    Coal-fired flue gas was the main source of SO2 and NOx,which had a great impact on the ecological environment.The development of simple technology,low investment and operation cost,good operation performance desulfurization and denitration integration technologies had become the control of flue gas pollution research focus in many countries.This paper mainly introduced the solid phase adsorption / regeneration study of desulfurization denitration method,gas / solid catalytic desulfurization denitration method,liquid-phase desulfurization denitration method and high energy electron activation oxidation integration technique and its recent progress.Some of above technologies were mature,some were being researched.Then the related technical principles,advantages and disadvantages and the application prospects were analyzed.Finally,based on the basic national conditions in China,the author researched the necessity and urgency of developing and popularizing coal-fired flue gas desulfurization denitration integrated technologies.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 108K]

  • Key problems analisys of coke-oven-gas-produced synthetic ammonia and urea project

    DIWU Xueying;WANG Zhuyong;China Coal and Coke Holdings Co.,Ltd.;

    In order to use coke oven gas reasonably and guarantee the coke-oven-gas-produced synthetic ammonia and urea project operate safely and stably,the project construction and its influencing factors from the aspects of coke oven gas yield and composition determination were investigated,especially sulfur content and impurities,choice of compressors and reformers,ammonia and urea loading match.The results showed that,coke oven gas yield and composition determined the production scale and the main process.The influence of impurity in coke oven gas on technical system also couldn't be ignored.The stable and reliable compressors for coke oven gas,purified gas,circulating gas and CO2 were the assurance of safe production.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 100K]

  • Application of flue gas circulation fluidized bed desulfurization project technical in Yitai

    GUO Xiaojiang;MA Haili;Inner Mongolia Yitai CTO Co.,Ltd.;

    In order to improve flue gas desulfurization efficiency,this paper first analyzed the desulfurization technology of circulating fluidized bed,then chose the system design parameters and desulfurizer based on the coal properties.At last,the authors analyzed the desulfurization efficiency.The results showed that the combination of the technique and furnace sorbent injection technology improved the desulfurization efficiency to 90%.The SO2 emission concentration was less than 200 mg / m3 and met the Standards for Boiler Discharge of Atmospheric Pollutants.Compared with the wet FGD technology,the technique had the advantages of compact structure,small investment,high efficiency,dry desulfurization product and without secondary pollutants.While its disadvantages also existed such as low desulfurization efficiency,poor adaptability dealing the changes of boiler load,higher operational control requirements.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 121K]

  • Preparation and flocculation efficiency of polyaluminum ferric chloride with Huangling coal slime

    SI Yucheng;DU Meili;WU Tao;WANG Doudou;College of Chemistry and Engineering,Xi'an University of Science and Technology;

    The content of Al2O3 and Fe2O3were 19.67% and 7.23% in Huangling coal slime ash.In order to utilize the high aluminum and iron,the polyaluminum ferric chloride(PAFC) was prepared through calcining coal slime ash,acid leaching and polymerization.The analysis of orthogonal test showed that the calcination temperature was the main influencing factor on the aluminum and iron leaching rate,followed by acid leaching time.The optimum process were that,the calcination temperature was 800 ℃,the calcining time was 2.5 hours,the concentration of hydrochloric acid was 6 mol / L,the ratio of liquid to solid was 6,the leaching time was 4.5 hours.The infrared spectroscopy and scanning electron microscopy indicated that aluminum and iron in the products polymerized well.The flocculation test of coal slime water showed that,when the polyaluminum ferric chloride dosage was 30 mg / L and p H ranged from 6 to 8,the flocculation effect was the best and the transmission rate was 91.7%.

    2014 06 v.20;No.94 [Abstract][OnlineView][Download 233K]



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