2016年05期目次

  • Sulfur-fixing experiment of high-sulfur coal combustion at high temperature

    YANG Qiaowen;GUO Ling;GUO Songjiang;YUAN Jinsha;WANG Xin;School of Chemical and Environmental Engineering,China University of Mining and Technology ( Beijing);

    In order to study the combustion characteristics of high-sulfur coal at high temperature,Ca( OH)_2 was selected as the main sulfur-fixing agent,Mg additive,Mn additive,Fe additive and Na additive were selected as sulfur-fixing additives and typical Panzhihua high-sulfur coal was selected as the research object,the content of total sulfur of Panzhihua coal was 4.04%.Through the experiment,the best mole ratio of Ca / S was 1.7.The sulfur-fixing ash of coal combustion was characterized by X-ray diffractometer( XRD) and X-ray fluorescence analyzer( XRF).The results revealed the formation mechanism of sulfur-fixing products,then drew the relationship between sulfurfixing ash and sulfur-fixing efficiency.It was found that the sulfur-fixing efficiency was positively correlated with SO_3 content and negatively correlated with the mole ratio of Ca / S in the sulfur-fixing ash. The combustion characteristic and kinetic analysis of coal samples were investigated with thermal gravity analysis method.The results showed that the ignition temperature of coal samples was all improved slightly with adding additives.The combustion process became into two-section combustion and the burning time was shortened.Through kinetic analysis of coal samples at low-temperature and high-temperature,it was found that the burning rate of coal samples were increased along with the increase of the average apparent activation energy,and the whole combustion performance of coal samples was improved when adding additives.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 188K]

  • Fabrication of porous ceramic from coal gasification residual

    ZHAO Yongbin;WU Haijun;ZHANG Xuebin;LIU Honggang;JING Yunhuan;YUAN Wei;Advance Materials Research and Development Center,National Institute of Clean-and-Low-Carbon Energy;College of Materials Science and Technology,Hefei University of Technology;Research and Development Center of Coal Chemical Company,Shenhua Ningxia Coal Group;

    In order to make full use of coal gasification residual,a kind of porous ceramic was prepared using coal gasification residual as raw material with pressure molding at lower temperature.The influence of sintering temperature on mechanical properties,phase structure,porosity,and N_2-gas permeability of porous ceramics were investigated. The results showed that,mullite phase and quartz phase were the main phases of porous ceramic.When the sintering temperature was 1 100 ℃,the properties of porous ceramic were the best. The porosity and average pore size of porous ceramics were 49.2% and 5.96 μm.The N_2 permeability was 2 452. 6 m~3/( m~2·h) under 0.01 MPa,the bending strength was 8.96 MPa.The technology was expected to be used for high temperature gas filtration and sewage treatment,and to solve the pollution of coal gasification residue.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 262K]

  • Integration of water with steam in coal gasification and syngas treatment for near zero waste water formation

    PENG Wanwang;Beijing Guoneng Clean Energy Engineering Co.,Ltd.;

    In order to realize near zero waste water formation,water and steam integration process as well as no-wastewater-discharge syngas treatment process were proposed.Based on the characteristics of typical fixed bed,fluidized bed and entrained bed gasification,the corresponding technical key and process were built.The water and steam from coal gasification and syngas treatment process were integrated to recycle.Some measures were adopted to treat the impurity in water including adding concentrating and salt crystallization equipment,absorbing and recycle organic mater by organic solvent,circulating phlegma in order to formate ammonium salts,using the steam from syngas wash water and phlegma evaporation in gasification and syngas shift reaction.The water balance of process was optimized to realize little or no waste water emission.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 331K]

  • Effect of high altitude on combustion characteristics of pulverized coal

    LIU Lijun;ZHANG Xilai;LIU Jiali;Qinghai Shenhua Low-carbon Energy Investing Co.,Ltd.;Xi'an Thermal Power Research Institute Co.,Ltd.;

    In order to obtain combustion characteristics of pulverized coal in high altitude areas,and guide the design of large-scale coalfired boilers in high altitude areas,the ignition temperature,burnout rate and NO_x generation of the pulverized coal at different altitude were studied by one-dimensional experiment furnace and ignition experiment furnace which could simulate the high altitude condition. The results showed that the coal ignition temperature increased and the burnout rate declined with the increase of altitude.However,the generation of NO_x was hardly influenced by the altitude.Like in low altitude areas,the ignition temperature of the testing pulverized coal increased with the decrease of coal fineness,while the burnout rate was barely impacted.Furthermore,the burnout rate and NO_x generation were influenced significantly by the combustion oxygen rate.Through synthetically consideration,the pulverized coal fineness should be lower and the burnout space should be enough while designing the boilers in high altitude areas.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 225K]

  • Progress and prospect of p-xylene production technologies

    HAO Xiwei;LIU Qiufang;LIU Gong;ZHANG Yaqin;ZHANG Shigang;Shaanxi Coal Chemical Technology Engineering Center Co.,Ltd.;

    In order to improve p-xylene production and economical efficiency,the technological processes,characteristics and application status of every technology were compared.The market opportunity and challenge of p-xylene production which took benzene,toluene as raw materials and methanol as alkylating agent were analyzed. The aromatic hydrocarbon synthesis based on petroleum route was more mature and reliable.The methyl alcohol to aromatic hydrocarbon as well as cumobenzyl alcohol to p-xylene based on coal chemical process haven't been put into industrial production yet.The new p-xylene synthesis process which took benzene and methylbenzene as raw materials,methanol as alkylating agent made full use of benzene and methylbenzene from aromatic hydrocarbon synthesis and methyl alcohol from coal chemical process.The new process complemented the process of petroleum to p-xylene,and it also broadened the sources of raw materials for p-xylene synthesis.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 142K]

  • Numerical simulation of coal water slurry gasification with synclastic multi-jet

    LI Falin;Energy Conservation and Engineering Technology Research Institute,Coal Science and Technology Research Institute Co.,Ltd.;National Research Center of Coal Water Slurry Engineering and Technology;State Key Laboratory of Coal Mining and Environment Protection;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

    In order to cover the shortage of current coal water slurry( CWS) fluidized bed gasification technology,a coal gasification technology with synclastic multi-jet was developed.A numerical simulation model was built using Aspen Plus.The influence of CWS concentration,oxygen-coal ratio and carbon conversion ratio on coal gasification effects was analyzed.The results indicated that with the increase of oxygen-coal ratio,H_2,CO and useful gas increased first,then decreased.With the rise of gasification temperature,the content of useful gas reached the maximum when the oxygen-coal ratio was 0.61.With the increase of carbon conversion ratio,the content of H_2,CO and useful gas increased and the gasification temperature lowered gradually.The percentages of effective gas( dry) could reach to 81. 3%,82. 5% and84. 2% when the CWS concentration was 60%,62% and 65% respectively. The percentage of useful gas increased about 0. 6% while the CWS concentration increased 1%.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 174K]

  • Application progress and prospect of Fischer-Tropsch synthesis reactor

    DU Bing;LIU Xiao;WANG Tao;BU Yifeng;MEN Zhuowu;National Institute of Clean-and-Low-Carbon Energy;

    FT( Fischer-Tropsch) synthesis reaction was a highly exothermic reaction.In order to transfer the heat of reaction and increase product yield,the characteristic and application scale of FT synthesis reactor were reviewed in this paper.Several new reactors emerging in recent years which might realize industrialization,such as fixed bed reactor,fluidized bed reactor,slurry bed reactor were introduced. The characteristics of reactors was compared and the development and prospects of reactors were analyzed.The results indicated that fixed bed reactor technology had matured,the products were easy to be separated and catalyst losses were reduced,while the heat emission efficiency was poorer.The heat emission efficiency of slurry bed reactor was better,while it was difficult to separate the products of solid and liquid.The high value light hydrocarbon products could be prepared by the fluidized bed reactor at high temperature,while the catalyst consumption was greater.The research suggested that if the target products were larger molecular such as diesel and paraffin wax,slurry bed reactor was a better choice.If the target products were chemicals such as olefin,fixed fluidized bed reactor was more appropriate.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 188K]

  • Solutions to sulfide high temperature corrosion problem in W flame boiler

    ZHANG Feng;SONG Libin;YAN Junshan;TIAN Zhanjun;Xi'an Thermal Power Research Institute Co.,Ltd.;Shang'an Power Plant,Huaneng Power International Co.,Ltd.;

    To resolve sulfide high temperature corrosion problem with water wall of combustion chamber of No.2 boiler in Shang'an Power Plant,the combustion mode and equipments condition of W flame boiler were analyzed.The results showed that some low-nitrogen combustion methods such as staged air,separation of pulverized rich-lean coal powder,increase of burn-out wind led to the problem. Under the condition,the combustion turned to oxygen-poor combustion from oxygen-excess combustion. Some solutions were provided from the aspects of operation oxygen content,open of burn-out wind door,swirl intensity of outer secondary air,coal properties and combination of running coal mill.After transformation,the measured points in which the O_2 was above 2%,CO was below 0.2% were increased obviously,and the reducing atmosphere and high temperature corrosion were weakened which improved the safety of unit operation remarkably.Under the best condition,the NOxconcentration of selective catalystic reduction method was below 800 mg / m~3 which was lower than the design value for transformation.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 375K]

  • Technoical progress and development suggestions of coal to aromatics

    XU Ruifang;ZHANG Yaqin;LIU Gong;HAO Xiwei;ZHANG Bianling;CHEN Yani;Shaanxi Coal Chemical Technology Engineering Center Co.,Ltd.;

    In order to provide a suitable technical route for the coal to aromatics plants,the latest development of coal to aromatics technologies in China and abroad as well as the aromatic market were analyzed.The results showed that the industrialized technologies of coal to aromatics mainly included methanol to aromatics and toluene alkylation with methanol to aromatics.The products of the former were the mixed aromatic products,and the products of the latter were p-xylene which had a larger market demand.Considering the maturity and reliability of technology and the product market,the technology of toluene alkyation with methanol to aromatics was a better choice.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 108K]

  • Advanced treatment of coking waste water by ozone catalytic oxidation technology

    HE Can;LIU Lizong;HE Wenli;Innovating Industrial Water Technology Co.,Ltd.;Coal Science and Technology Research Institute Co.,Ltd.;Go Higher Environment Co.,Ltd.;

    The COD_(cr) of the effluent from the secondary biological treatment process of coking waste water couldn't meet the standard.In order to resolve the problem,the effects of advanced treatment of coking waste water by ozone catalytic oxidation technology was analyzed through a pilot test.The influence of p H value,reaction time,ozone dosage,and the catalyst on COD_(cr) removal rate were investigated. The optimal operating parameters were determined. After 68 days continuous operation,when the dosage of COD_(cr) ranged from 140 mg / L to200 mg / L,the reaction time were 1. 5 h,the ozone flow velocity were 80 mg /( L · h),the average COD_(cr) removal rate was above 60%which met the Emission Standard of Pollutants for Coking Chemical Industry,China( GB 16171—2012).The operation cost was RMB 1. 30 per cubic meter which accounted for only 25% to 50% of the operation cost of forced coagulation and sedimentation technology.The process was stable and reliable in operation.The specific surface area and pore structure didn't change significantly after and before the use of catalyst.Meanwhile,the catalyst still had activity.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 241K]

  • Transformation and performance of calcium-based sulfur retention agents during coal slime combustion

    CHANG Keke;MA Zhibin;YANG Fengling;CHENG Fangqin;Institute of Resources and Environment Engineering,Shanxi University;Shanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes;Coal Combustion Pollution Controlling and Utilization of Shanxi Province Key Laboratory;

    To decrease the emission of SO_2 during coal slime combustion,the mineral composition and chemical composition of coal ash were analyzed using XRD and ICP.The transformation and sulfur capture efficiency of CaCO_3 and CaO during coal slime combustion were investigated.When the temperature was lower than 820 ℃,the CaCO_3 and CaO mainly transformed to anhydrite and lime which didn't react with the mineral composition in coal slime.When the temperature was higher than 820 ℃,the CaCO_3 and CaO transformed to anhydrite and quick lime,and the quick lime reacted with silicon dioxide and aluminum oxide to form gehlenite. When the temperature was above1 000 ℃,some of sulfur retention products CaSO_4 began to break down,so the sulfur capture efficiency reduced. Compared with the briquette prepared using coal slime only,the addition of sulfur retention agents could improve sulfur capture efficiency obviously.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 552K]

  • Selection of hydrogen production technology for refinery plant

    MA Wenjie;YIN Xiaohui;Panwen( Shanghai) Automation Engineering Co.,Ltd.;Sinopec Ningbo Engineering Co.,Ltd.;

    In order to select economical and effective hydrogen production technology for refinery plant in China and obtain high quality produce with low cost,the technological processes,investment,cost of steam methane reformer( SMR),heavy oil pox,coal / petcoke pox,coke oven gas( COG) pox were compared. The results showed that the coal / petcoke to hydrogen had the lowest cost of RMB 0. 74 per cubic metre,the heavy oil pox had the highest cost of RMB 1.42 per cubic meter,the cost of natural gas to hydrogen RMB 0.87 per cubic meter which was still higher than the cost of coal to hydrogen even in a down market.The coal / petcoke to hydrogen process had the cost advantage and it also could optimize the material balance of refinery,which was still the main developing direction of complementing hydrogen in domestic refinery.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 238K]

  • Selection of extraction agent for phenolic from coal derivative oil based on cavity effect

    ZHAO Yuan;Research Institute of Coal Chemistry,Coal Science and Technology Research Institute Co.,Ltd.;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

    In order to narrow the scope of extraction agent for phenolic from coal derivative oil and reduce the number of the tests,the free phenol and neutral oil components in typical coal derivative oil were analyzed. The extraction agents were screened based on cavity effect and enthalpies.The consumed energy was calculated during extraction which helped to narrow the scope.The results showed that,phenol and cresol were the main phenolic compounds,and indene and naphthalene were the main neutral oil compounds in typical coal derivative oil.The inert extraction agent for alkane and aromatic hydrocarbon were not usable due to the high energy consumption-2 to 1 k J / mol.On the other hand,the solvents including alcohols,carboxylic acids,ethers,ketones and amine etc,were suitable for extraction,because they could form hydrogen bond with phenol molecule and consume lower energy-80 to 20 k J / mol in the extraction process. The solvent such as alcohols and carboxylic acids etc,which could form hydrogen bond within their molecules,consumed higher energy in the processing of extracting phenolic compound than the solvents of ethers,ketones and amine etc.among which only the intramolecular van der walls bond existed.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 186K]

  • Influence of deepening setting depth of pump process on coalbed methane

    FENG Ruyong;LIU Yinghong;LIAO Xia;FANG Maojun;LI Na;New Energy Research Center,CNOOC Institute Research;

    Deepening setting depth of pump process was an effective measure to increase production of coalbed methane wells. In order to study the applicable conditions of operation and influence law of deepening setting depth of pump process on coalbed methane production,characteristics of deepened coalbed methane wells on Shizhuangnan block were studied by analyzing factors such as drainage continuity,water rate characteristics,show gas time,stable production rate,dynamic liquid level height before the implementation of deepening setting depth of pump process,and applicable conditions are put forward.Results show that,under applicable conditions,deepening setting depth of pump process could substantially increase coalbed methane production.30 Shizhuangnan block well's production were increased to 1 007 ~5 504 m~3/ d after operation which were 2 to 38 times of previous production,and more than 21 well's production was increased up to 5times.So deepening setting depth of pump process was one of the stimulation measures which could increase coalbed methane production and exploitation effect.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 289K]

  • Effect of reduction process on iron-based catalyst reaction performance for Fischer-Tropsch synthesis

    ZHU Jiaqing;CHENG Meng;CHANG Hai;LIN Quan;ZHANG Kui;WU Peng;National Institute of Clean-and-Low-Carbon Energy;

    In order to investigate the influence law of reduction process on iron-based Fischer-Tropsch synthesis,the effect of reduction H_2/ CO ratio,reduction temperature,reduction space velocity and reduction pressure were investigated with iron-based catalyst in a fixed bed reactor.The experimental results showed that surface area of reduced iron-based catalyst was decreased,and mean pore size was increased during different reduction process. Catalyst activity was inhibited,due to the increase of reduction H_2/ CO and pressure which caused the selectivity of methane and carbon doxide increased,C_(5+) selectivity decreased,ratio of light hydrocarbon increased.The increase of reduction temperature and reduction space velocity were beneficial to catalyst activity.Product distribution would tend to light hydrocarbon with the increase of reduction temperature,and product distribution had no been effected with the increase of reduction space velocity.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 122K]

  • Experimental method of feedwater hardness for industrial pulverized coal boiler

    LI Dianxin;JIA Dongliang;LUO Wei;Energy Conservation and Engineering Technology Research Institute,Coal Science and Technology Research Institute Co.,Ltd.;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

    In order to use small amount of NH_3NH_4Cl buffer solution and chrome black T to test the feedwater hardness of industrial pulverized coal boiler accurately,the influence of reagent dosage and sampling volume on feedwater hardness was investigated. The results showed that,when the sampling volume were 100,50,25 m L,the reagent dosage had no effects on the test results,while the sampling volume had great influence.When the sampling volume were 50,100 m L,the hardness was the same,25 m L sampling volume led to a larger error.So from the point of economical use of NH_3NH_4Cl buffer solution and chrome black T,50 m L feedwater,1 m L NH_3NH_4Cl buffer solution and one drop of chrome black T was the best usage.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 155K]

  • Pressure selection of coal to hydrogen by coal water slurry gasification technology

    LIU Wen;YIN Xiaohui;LI Kehai;Sinopec Ningbo Engineering Co.,Ltd.;

    In order to determine the most appropriate pressure for hydrogen production plant from coal water slurry,taking petroleum coke as raw material,adopting single nozzle coal water slurry gasification technology,under the hydrogen production scale of 2×105m~3/ h,the equipment arrangement,technical economic index,consumption,investment between 4. 0 MPa and 6. 5 MPa were compared. The results showed that under 4.0 MPa,the series were increased,equipment structure and size got bigger in gasification and purification plant,which led to an increase in investment.The increase in series also led to a decrease in reserve ratio. Online rate and device reliability were decreased,which was not good for continuous supplying hydrogen. The pressure level of 4. 0 MPa increased the consumption of rectisol unit and refrigerant load.Therefore,under the hydrogen production capacity of 2×105m~3/ h,the investment,consumption,covering areas,online rate,reliability,complexity of operation and maintenance,manufacturing cost and so on under 6. 5 MPa were all better than 4. 0 MPa. It should give priority to 6.5 MPa when considering the selection of coal-water slurry gasification pressure.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 130K]

  • Recycle of sulfur element in Shenhua direct coal liquefaction technology

    WU Qiong;GAO Yulong;LIU Kelan;China Shenhua Coal to Liquid and Chemical Co.,Ltd.;Ordos Coal Liquefaction Company,China Shenhua Coal to Liquid and Chemical Co.,Ltd.;Group Coal to Liquid Company,Shenhua Ningxia Coal Industry;

    Sulfur in coal feedstock and catalyst additives most converted to H_2S and went into middle-pressure process gas,dry gas,LPG,and acid water during Shenhua coal direct liquefaction process.In order to meet the requirements of products quality and process condition,the gas desulfurization process was employed by Erdos direct coal liquefaction demonstration plant to recycle sulfur element in gas component.The sulfur recovery rates of middle-pressure process gas,dry gas,LPG reached 97.28%,99.92% and 99.99% respectively.The stripping process was used to removed H_2S from acid water and the recovery rate was up to 99.6%.The H2 S from stripping process and desulfurization process was mixed first,then the H_2S was converted to sulfur by Claus sulfur recycle process and the average recycling quantity was 14 683. 5 t / a.Sulfur product was used as catalyst addictives of coal liquefaction reaction and injected sulfur of hydrogenation reaction to realize sulfur element recycle and reduce the pollution of the environment.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 142K]

  • Industrialization progress of methanol to olefins

    LIU Gong;ZHANG Yaqin;WANG Dengjun;Shaanxi Coal Chemical Technology Engineering Center Co.,Ltd.;

    In order to develop modern coal chemical technology of methanol to petroleum and chemical products,the industrial application of methanol to olefin( MTO) and methanol to propylene( MTP) technology were described.Economical efficiency of partially industrialized device were analyzed.So far,16 sets have been put into commercial operation.The MTO technology was becoming more and more sophisticated. When the oil price ranged from 40 to 50 dollors per barrel,the MTO technology was still economical,and the MTO technology need moderate development.In order to avoid projects repeated construction of the same kind which might lead to homogeneous competitions,the MTO technology need to be updated continuously.On the one hand,the new generation technology of MTO and MTP need further expand to elevate the project economical efficiency,on the other hand,new methanol to olefins technologies aimed for propylene and C_4 olefins were also developed to increase the product diversity.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 100K]

  • Experimental study on coke oven gas pyrolysis to acetylene on DC-plasma

    LI Mao;GU Xiaohu;State Key Laboratory of Coking Coal Resources Development and Comprehensive Utilization,China Pingmei Shenma Group;

    In order to develop a clean acetylene production technology and reduce the pollution of calcium carbide method,the production of acetylene from coke oven gas and absorbed gas on a 100 k W DC-plasma was investigated.The effects of flow rate,H_2/ CH_4 ratio and reactor diameter on the reaction were analyzed.The results showed that there was a consistent tendency of coke oven gas and adsorbed gas.With the increase of flow rate,the conversion of methane,the selectivity and yield of acetylene were improved,and specific energy of requirement was decreased. The conversion of methane,the selectivity and yield of acetylene for coke oven gas were 50. 13% ~ 62. 95%,60. 1% ~ 71. 3%,30.1% ~ 44. 8%,and the conversion of methane,the selectivity and yield of acetylene for absorbed gas were 56. 65% ~69. 56%,70. 05% ~ 83. 33%,39. 6% ~ 57. 9%.The conversion of methane,the selectivity and yield of acetylene were declined with the increase of H2/ CH_4 ratio,and adsorbed gas had better performance because higher levels of CO_2 and O_2 could improve methane conversion.The conversion of methane,the selectivity and yield of acetylene,and specific energy of requirement were 69. 56%,83. 33%,57. 96%,13.66 k Wh / kg respectively.The results of Φ16 mm reactor was better thanΦ17 mm.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 239K]

  • Research progress on coal quality changes and migration of harmful elements

    HONG Wei;ZHANG Heng;ZHANG Chuntian;WANG Xinyan;CAO Guang;WU Dongpo;ZHAO Xiuhong;GAO Jianwen;MI Fei;Coal Inspection Technique Center,Qinghuangdao Entry-exit Inspection & Quarantine Bureau;

    In order to investigate the fluctuation of coal quality indicators such moisture,ash and calorific value as well as the migration and transformation of harmful elements during coal transportation and storage,the research progress on coal quality changes and harmful elements migration at home and abroad were introduced.The results showed that the coal quality changes lowered the coal properties and the migration of harmful elements polluted the environment.Coal preparation could improve the calorific value of coal and removed the sulfur and ash obviously.The research should focus on the migration rule and principle of harmful elements.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 107K]

  • Ability of methanogens in Zhaozhuang mining area Qinshui coal field

    GUO Xin;TAO Kunpeng;LI Yanjie;HAN Zuoying;Yi'an Lanyan Coal and Coal-bed Methane Simultaneous Extraction Technology Co.,Ltd.;State Key Laboratory of Coal and Coal-bed Methane Simultaneous Extraction;

    In order to improve coalbed methane yield of Zhaozhuang mining area,the water from coalbed methane well was tested based on the theory of methane production from coal by methanogens.The fluorescence microscope and macro metagenome sequencing of archaea's16s r DNA V6 areas were adopted to verify the reliability of bacteria source. The simulation experiment of coal biotransformation was conducted in a small bottle and medium-sized fermentation tank for 49 days using anaerobic culture method.The change of bacteria number,gas generation law,proximate analysis of coal after the experiment were tested and investigated.The coal surface was observed by scanning electron microscope.The results showed that,the percentage of methane from small and medium-sized simulation experiment were as high as 25%,31% respectively.The change of bacteria number went through slow growth,significantly increase and slowing down which were basically consistent with gas generation law.Compared with the fixed carbon and violate of the raw material,those of coal sampale after biotransformation decreased.Some methanogens community attaching to the surface of coal for coal biodegradation were observed.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 216K]

  • Experimental study on oil shale winnowing dust removal technology based on the vibration francis principle

    SHI Changjiang;WANG Xingkun;WU Xinli;LIU Pan;LIU Dahai;Beijing Guodian Futong Science and Technology Development Co.,Ltd.;School of Mechanical Electronic & Information Engineering,China University of Mining and Technology ( Beijing);

    The mixture of-0.2 mm dust and impurities in shale oil which was prepared by destructive distillation method decreased the quality of shale oil.In order to resolve the problem,the pneumatic cleaning method was adopted to treat oil shale.The dust removal efficiency was investigated by adjusting wind volume and changing screen mesh. The results showed that,the dust removal efficiency could reach up to 91%.The dust removal efficiency was reached the maximum when the screen mash type was 10 mm×10 mm square,the wind volume was 4 767. 2 m~3/ h.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 265K]

  • Low nitrogen combustion stability of coal-fired boiler

    WANG Chengliang;TAN Houzhang;Huadianguoji Technical Service Center;MOE Key Laboratory of Thermo-Fluid Science and Engineering,Xi'an Jiaotong University;

    The extinguishment was frequently occurred in a 300 MW coal-fired boiler with low nitrogen combustion reformation.Testing investigation was performed to analyze the reasons.It was found that unreasonable air distribution and the larger reverse tangent angle of primary air decreased the rotation momentum of thermal primary air.It also was the main reason for combustion stability decrease and extinguishment in boiler.Therefore,the research on optimization of air distribution mode and reverse tangential angle were carried out to analyze the influence mechanism of decreasing rotation momentum thermal dynamic field on combustion stability. The operation optimization and improvement scheme was proposed for enhancing the combustion stability for boiler.The boiler combustion stability was improved obviously through the operation optimization and improvement scheme. The research results could provide some reference and guidance for operating economically and low nitrogen combustion reformation.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 135K]

  • Determination of benzopyrene in water using high performance liquid chromatography

    LIU Mingyan;Longnan Environmental Monitor Station;

    Benzopyrene was a strong cancerogen,in order to reduce its pollution to environmental medium such as soil,air and water,the measurement of benzopyrene in water was necessary. One analysis method was bulit which combind liquid-liquid extraction and high performance liquid chromatography( HPLC).The experiment condition was that,the dichloromethane was extractant,the mass ratio of acetonitrile to water was 85 to 15,the flow velocity was 1 m L / min,the column temperature was 25 ℃.Under the condition,0.5 μg benzopyrene was dropped into 1 L blank water sample,seven parallel samples were tested.The results showed that,the adding standard recovery of benzopyrene ranged from 85.2% to 86.6%,the standard deviation was 0.5%.When the extracting volume became smaller from 1 L to 1 m L,the sample volume was 10 μg,the method detection limit was 0.008 μg / L.

    2016 05 v.22;No.105 [Abstract][OnlineView][HTML全文][Download 119K]



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