2015年04期目次

  • Magnetization modification and pre-magnetization flocculation and sedimentation of slime water

    LI Jianjun;QIAO Shangyuan;ZHU Jinbo;MIN Fanfei;LIU Lingyun;ZHANG Liting;Department of Materials Science and Engineering,Anhui University of Science and Technology;

    In order to investigate the influence of magnetization on same surface charge( ζ potential) of slime and surface hydration shell,the magnetization test on slime water was conducted taking magnetic field intensity and magnetizing time as variables. The slime water was clarified by natural sedimentation,flocculation,coagulation sedimentation,pre-magnetization flocculation and sedimentation method respectively. The sedimentation characteristics and magnetization mechanism were investigated. The results showed that,after being pre-magnetized for 2 minutes to 3 minutes under 0. 15 T to 0. 25 T magnetic field,the ζ potential of slime was decreased from 30. 5 me V to 20.1 me V,the thickness of surface hydration shell was reduced obviously. The sedimentation velocity and tailings height of coagulation sedimentation,and pre-magnetization flocculation and sedimentation were better than those of flocculation sedimentation. The sedimentation velocity,supernatant transmittance,tailings height were better than those of pre-magnetization flocculation and sedimentation. The tailings height decreased by 25%,the supernatant transmittance could reach 82. 2%.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 459K]

  • Research status and development trend of pulverized coal transportation by dense phase conveying system under high pressure

    LI Jun;LU Hong;GUO Yi;LI Xuan;National Institute of Clean-and-Low-Carbon Energy;

    In order to optimize the dense phase conveying system in dry coal gasification process,the dense phase pneumatic conveying technology under high pressure and solid conveying pump based on the theory of solid mechanics of granular media were introduced. The characteristics and critical process of the two methods were summarized. The development trend of solid conveying pump under high pressure was introduced. The fundamental research about granular media statics and dynamics,the function relationship between coal types,moisture,particles size and friction coefficient were the focus of the research. The maximum delivery pressure of Stamet Pump and PWR which provided for the coal types in China was researched. Concerning the bottleneck of XTL industrial scale-up,we also put forward the solutions.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 621K]

  • Application of sieve bend with vibrating and striking function in Xiegou coal preparation plant

    LIU Xiaohui;QIU Guanglei;WANG Jiannan;Xiegou coal preparation plant,Shanxi Xishan Jinxing Energy Co. ,Ltd.;

    In order to improve dehydration efficiency of sieve bend and decrease moisture of mixed coal in Xiegou coal preparation plant,a striking device and a vibrating motor were installed on the screen surface of sieve bend. The using effects and economic benefits after transformation were also analyzed. The results showed that,the fine coal in crack of sieve bend was removed with the action of hitting. A steady vibrational frequency made the materials on surface of sieve bend distribute uniformly and move fluently. The transformation optimized the dehydration,desliming and classifying roles of sieve bend. The dehydration efficiency was increased from 32% to 55. 5%,the moisture of coarse slime was decreased from 14% to 10%,the moisture of mixed coal was decrease by 0. 2%,the calorific value increased by 0. 48 MJ / kg. The coal preparation plant could save the cost of RMB 3. 72 × 106 one year.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 197K]

  • Application of coal water slurry mass fraction improvement technology in Xinneng Energy Company

    ZHANG Shengju;HE Guofeng;DUAN Qingbing;China Coal Technology and Engineering Clean Energy Co. ,Ltd.;

    To improve mass fraction of gasification coal water slurry( CWS) and reduce production cost,an advanced process which adopted low-rank coal to prepare high mass fraction CWS was introduced by Xinneng Energy Company. The quality of CWS and each gasification index before and after transformation were analyzed. The influence of CWS mass fraction on specific coal and oxygen utilization,volume fraction of effective synthesis gas and methanol yield was studied. After transformation,the mass fraction of CWS increased from 59. 11% to61. 36%. The handing capacity of each rod mill increased from 65 t / h to 78 t / h,specific coal and oxygen utilization decreased to 595. 2g / m3 and 384. 0 dm3/ m3 from 602. 5 g / m3 and 392. 0 dm3/ m3 respectively. The effective synthesis gas was raised from 81. 78% to82. 86%. The crude methanol production increased by 47. 3 m3 every day.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 383K]

  • Application of response surface methodology on improvement of Shenfu coal slurryability

    QU Jianlin;ZHANG Dongdong;ZHOU Anning;GONG Ming;YU Wei;SONG Chengjian;College of Chemistry and Chemical Engineering,Xi'an University of Science and Technology;

    Shenfu coal was difficult to prepare high-concentration low-viscosity coal water slurry( CWS) due to its low ash,low sulfur and high inherent moisture. In order to resolve the problems,taking mass fraction of 12 μm and 6. 5 μm ultra-fine coal,compound dispersant as research factors,a regression equation about viscosity was obtained by variance analysis and Box-Behnken. Through response surface methodology( RSM),the influence of three factors on CWS viscosity were analyzed,the experimental results were also optimized. The optimum formula was that,the mass fraction of 12 μm and 6. 5 μm ultra-fine coal was 55% and 35% respectively,the dosage of compound dispersant was 1. 04 g,and the predicted viscosity was 918. 65 m Pa·s. Keeping the concentration of CWS unchanged,the improving experiment was conducted according to the optimum formula,the viscosity of CWS reduced from 1975 m Pa·s to 1066. 67 m Pa·s. The stability and rheological property of CWS were improved significantly.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 757K]

  • Cleaning potentiality analysis of harmful microelements in coal

    ZHANG Bo;Tangshan Research Institute Co. ,Ltd. ,China Coal Technology and Engineering Group Co. ,Ltd.;

    In order to reduce harmful microelements in coal and improve commercial coal quality,the raw coal from Dahebian coal mine was chosen as research object. Through multi-step releasing flotation test,the harmful microelements yield and migration characteristics were investigated. In order to determine the harmful microelements content,eight coal samples from four coal preparation plants were measured with inductively coupled plasma massspectrometry. The removal efficiency,migration law and cleaning potentiality of harmful microelements were analyzed. The results showed that,most of minerals in coal were existed in ash,so the minerals could be removed with the removal of ash. The coefficient of association between harmful microelements and minerals was greater than 0. 708 which indicated that the two had a correlation. The harmful microelements in coal occurred in the form of inorganic minerals,so the harmful microelements migrated in accordance with the migration patterns of inorganic minerals. Only a few harmful microelements occurred in the form of organic minerals and the conventional physical separation played a limited role in treating these microelements. Diversity of some harmful microelements determined their removal efficiency fluctuated over a large range.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 1002K]

  • Application of strong brine from coal chemical industry in coal slime water settling

    XIONG Liang;YU Guangxin;SUN Yuping;XIAO Gang;New Energy Research Institute,China National Offshore Oil Corporation Research Institute;

    In order to utilize strong brine from coal chemical industry comprehensively,slime water free settling experiments were conducted using strong brine and the Yellow River water. By simulating flotation technological conditions,the coal slime was separated by strong brine,PAM and PFS. The results showed that,the coal slime was easy to mud,so it was difficult to settle. A certain concentration of strong brine was helpful to the free settling of coal slime. The mass fraction of residual suspended solids could be controlled within 21%. The settlement effects of strong brine which was diluted with two times water was the best,the removal rate of suspended solids was above 85%.The combined of PAM and PFS could obtain a better effect,and the concentration of the two was 3 m L / L and 0. 5 m L / L.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 307K]

  • Coal characteristics and extension plan of Xiaoyugou coal preparation plant

    CHEN Jun;Coal Mining and Designing Department,Tiandi Science and Technology Co. ,Ltd.;

    In order to improve handing capacity of Xiaoyugou coal preparation plant,taking raw coal as research objects,the screen analysis and float-and-sink analysis were conducted,then the quality and quantity of products were compared. The main equipments and specific extension plan were determined based on the raw coal properties. The results showed that,the slack coal which accounted for 65% among raw coal was separated by two-product dense medium cyclone. The yield of tailings was 40%. The handing capacity of Xiaoyugou coal preparation plant was increased from 3. 80 Mt / a to 5. 00 Mt / a by extending the main separation building,pressure filtration and concentration building,transforming some devices in the main separation building,adding slack coal separation system. After transformation,the system was adaptable to a wide range of lump coal and slack coal. The medium system for lump coal and slack coal were completely independent,so the separation density,ash of products and calorific value of products could be controlled flexibly. The moisture of lump clean coal and slack clean coal decreased by 1%,the medium consumption reduced by 0. 20 kg / t.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 100K]

  • Optimization of coal slime water processing system in Qidong coal preparation plant

    WANG Hongsheng;XU Chuyang;FAN Zhongyue;LIU Lei;GOU Shanxin;School of Materials Science and Engineering,Anhui University of Science and Technology;Qidong Coal Preparation Plant,Wanbei Coal Group;School of Chemical Engineering and Technology,China University of Mining and Technology;

    For a series of reasons,such as high-concentration circulating water,poor separation effects,long discharging cycle of pressure filter,decrease of handing capacity,the slime water flocculation and sedimentation test and tailings pressure filtration test were conducted by changing the kind and dosage of flocculant and fliter aid. The practical dosing system and points were optimized. The results showed that,when the dosage of flocculant TLT8634 was 6 m L,the minimum settlement time could reach 8 s,the compressed height of slime were100 mm,the clarity of supernatant was 15,each index met the demand of production. When the dosage of filter aid TLT5140 was 300 g / t,the pressure filtration time was shortened by 53. 44%,the moisture was decreased by 2. 58% comparing with the time of blank test. The dosing points of flocculant and filter aid was three-point model and the distance between each point were 0. 5 m. After optimization,the cost of flocculant and filter aid decreased from RMB 1. 96 to RMB 1. 40 per ton,the saving agent cost RMB 1. 1 × 106. The mass concentration of recirculating water was below 1 g / L which realized closed water circuit.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 111K]

  • Technological process selection of Xingxian coal preparation plant

    ZHANG Xinlong;Coal Mining and Designing Department,Tiandi Science and Technology Co. ,Ltd.;

    In order to design efficient,energy-saving coal preparation process,the characteristics of No. 8-2and No. 13 coal seams of Xingxian coal preparation plant were analyzed. According to the coal characteristics,the products structure of coal preparation plant were optimized. The results showed that,the overall distribution of 50 mm to 0. 5 mm size fraction was uniform,and the ash content was decreased gradually when the size fraction reduced. The gangue was not easy to degrade. The yield of low-density and high-density minerals were similar. In other words,the yield of low-density mineral was lower and the yield of high-density mineral was higher. The abnormal phenomenon made the separation of low-ash clean coal difficult to achieve. The main product of Xingxian coal preparation plant was steam coal,followed by blended coal for coking. When the mass ratio of No. 8-2coal seam to No. 13 coal seam was 2 to 1,the products were ten-level clean coal,high-quality and ordinary quality steam coal. The optimum technological process was that,for 50 mm to 1. 5mm particles,a pressurized two-product dense medium cyclone was conducted primary cleaning and recleaning. The 1. 5 mm to 0. 25 mm particles was dewatered with a centrifugal machine. The-0. 25 fine slime was recovered with a pressure filter.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 115K]

  • Comparison of nitrogen in coal by semi-micro Kjeldahl method and infrared thermal conductivity method

    LONG Yaping;Geological Institute,Xi'an Research Institute Co. ,Ltd. ,China Coal Technology & Engineering Group Co. ,Ltd.;

    In order to improve the test efficiency of nitrogen in coal,two determination methods of Nitrogen in coal in GB / T 19227-2008 and infrared thermal conductivity method were compared. The results showed two test methods were accurate,there was no significant difference of coal,which met the test requirements. However,it was more simple,high automation and operation safety with infrared and thermal conductivity method.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 278K]

  • Image segmentation method of slime floatation foam image based on machine vision

    XIE Peihong;XU Shoukun;LU Zhaolin;ZHOU Changchun;School of Information Science and Engineering,Changzhou University;School of Chemical Engineering and Technology,China University of Mining and Technology;

    An image segmentation method based on ROF model and top-hat transformation of mathematical morphology was proposed to solve the problems of noise interference and adherent foam in slime flotation foam image. The discontinuous function included in the function space of bounded total variation of the ROF model corresponded to the edge profile of the objective in the image. Hence,the ROF model was ideally suited for the image filtering. The space among foams could be increased using the top-hat transformation. Adherent foams could be segmented easily. The image segmentation method was conducted as follows. First,the slime flotation foam image was filtered using the ROF model. Then,the image was top-hat transformed and the space increased accordingly. Finally,the watershed algorithm was applied to segment the foam image. Theoretical analysis and experimental results showed that the method could segment the foam fast and accurately in complex slime flotation foam image,the accuracy could reach 81. 1%.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 1361K]

  • Status and development suggestions of methanol industry in Yulin

    LI Jian;YAN Long;LI Nina;KANG Yuhong;MA Yajun;CHEN Luyuan;Institute of Chemistry and Chemical Engineering of Yulin University,Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization;Bureau of Statistic of Yulin;Yanzhou Coal Mining Yulin Energy and Chemical Industry Co. ,Ltd.;

    In order to study the effects of methanol production enlargement on economics benefits of Yulin,the development process,present situation and influencing factors,the positive and negative factors of Yulin city were introduced. Because of the rich coal resources and developed transportation,there were seven over 6 × 105 t / a methane production projects,some of which have been completed or under constructed. With the commissioning of new capacity,Yulin will be the largest methane production base. While the shortage of water,human resource,high energy consumption and environmental pollution limited the development of methane industry. To resolve these problems,the paper provided that,extending industry chain,adopting energy saving technologies,strengthening macro-control and pollutants disposal,cultivating human resources were the main solutions.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 209K]

  • Research progress of direct coal liquefaction reaction mechanism

    LIU Min;SHI Shidong;QU Sijian;LIU Lilin;SHENG Ming;Beijing 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;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;

    The process of direct coal liquefaction was introduced in order to investigate the reaction mechanism theories. The processes of swelling,coal pyrolysis,hydrogen-donor solvent pyrolysis,H2 dissolution and activation,reaction among free radicals were analyzed. The results showed that,the free radicals concentration almost reached maximum when the pyrolysis time was shorter than 10 minutes during a suitable temperature range. The reaction activity of free radical from highest to lowest in sequence was from coal pyrolysis,hydrogen-donor solvent and H2. The reaction between H2 and free radical was the key factor of H / C ratio of liquefaction product. Based on the analysis of reaction mechanism,the reaction mechanism between H2 and free radical under different catalyst should be further clarified. Developing high active catalysts condition,lowering reaction temperature and pressure was a further research direction for coal direct liquefaction.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 398K]

  • Structures and composition of S and N compounds in direct coal liquefaction oil

    LI Weilin;SHI Zhijie;ZHANG Xiaojing;LI Junfang;HU Fating;Beijing Research Institute of Coal Chemistry,Coal Science and Technology Research Institute Co. ,Ltd.;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;

    In order to offer basic data for upgrading of direct coal liquefaction oil( DCLO),analysis of S and N compounds in DCLO was studied. Composition and contents of S and N compounds were detected with GC-PFPD and GC-NCD respectively. Optimum analysis conditions of GC-PFPD and GC-NCD were given. The S and N compounds in DCLO were analysised. Benzothiophene and dibenzothiophene compounds were the main S compounds in DCLO,more than 90% of S in DCLO,and they were the main S compounds during desulphurization. Five membered rings( 32% of N in DCLO) were the main N compounds in DCLO,more than 50% of N in DCLO,which mainly were indoles and carbazoles,and they were the main N compounds during denitrification.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 403K]

  • Deactivation and regeneration of Fischer-Tropsch cobalt catalyst

    LI Jiabo;LIN Quan;SHI Yulin;HU Yunjian;LUO Xi;National Institute of Clean-and-Low-Carbon Energy;

    In order to decrease cost of Fischer-Tropsch cobalt catalyst and improve its stability and lifetime,the inactivation and regeneration mechanism of Fischer-Tropsch cobalt catalyst was analyzed. Based on the regeneration mechanism,the regeneration methods of Fischer-Tropsch cobalt catalyst were introduced. The results indicated that poison,sinter,carbon deposition,oxidation and solid reaction were the main causes for catalyst inactivation. The stability and lifetime of Fischer-Tropsch cobalt catalyst could be improved by purifying feed gas,regulating reaction between cobalt and support,improving catalyst formulation and process,controlling cobalt particle size and partial pressure ratio between H2 O and H2. The catalyst could be regenerated by de-wax,oxidation and reduction,oxidation was the critical step.The heating rate and heat removal should be controlled during oxidation process. Multi-oxidation and reduction could improve the uniformity of cobalt and reduction agents,and improved the activity of catalyst.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 133K]

  • Separation of methane / air by pressure swing adsorption with commercial molecular sieve

    LIU Chang;ZHANG Jinhua;CHE Yongfang;GUO Haoqian;LI Xiaoliang;LI Xuefei;Beijing Research Institute of Coal Chemistry,Coal Science and Technology Research Institute Co. ,Ltd.;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;Beijing Key Laboratory of Coal Based Carbon Materials;

    In order to improve adsorption and concentration effects of coalbed methane by pressure swing adsorption( PSA),the upgrading and separation efficiency of methane / air mixture gas was studied by four-tower PSA device based on a kind of commercial molecular sieve. The effects of adsorption time,adsorption pressure,and concentration of raw gas on enrichment and economical efficiency were researched. The results showed that the enrichment and separation effects of the molecular sieve was the best when the adsorption time was180 s while adsorption pressure was 300 k Pa. Longer adsorption time or higher adsorption pressure was of no advantage to the reaction. For high,medium and low concentrated coal bed methane,the rate could be improved by more than 20% at one time through controlling the adsorption time and pressure,which could enrich the raw gas to 30. 56%,76. 33%,89. 18% from 10%,35%,65%. The handing capacity for raw gas could increased to 67. 77,68. 99 and 83. 36 m3/( t·h) by 20%,40%,25%. The experiments could provide reference for the industrial application in coal bed methane enrichment. The recovery of methane in product increased to 94. 45%,69. 68% and 87. 22%.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 840K]

  • Status and development of lump coal pyrolysis and reactor design technologies

    LIU Shuxian;MEN Zhuowu;GUO Yi;CHEN Aiguo;WANG Xianghui;CHEN Wei;WENG Li;National Institute of Clean-and-Low-Carbon Energy;

    To promote clean and efficient conversion of lump coal in China,typical coal pyrolysis technologies and reactor characteristics at home and abroad were summarized from the aspects of reactor design mechanism,structure characteristics,application scope. The application of vertical pyrolysis furnaces and rotary pyrolyzers on lump coal pyrolysis was discussed. The results showed that the lump coal pyrolysis processes with solid heat carrier had the advantages of high reaction rate and pyro-gas calorific value,little dust entrainment. Supported by optimized rotary reaction equipment,the processes were easy to realize industrial large-scale production. Carrying on the general problem of dust removal from high temperature pyro-gas,some solutions were proposed,such as to develop high temperature electrostatic precipitators,compound separation system like cyclone-granular moving bed filter and cyclone-ceramic filter.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 945K]

  • Application of high efficiency pulverized coal combustion technology in regional central heating

    SONG Chunyan;Coal Science and Technology Co. ,Ltd.;State Key Laboratory of Coal Mining and Environmental Protection;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

    In order to save oil and gas resources,develop low cost regional centralized heat resources,the regional centralized heating technology and development direction were introduced in china and abroad,the efficiency of pulverized coal combustion technology and efficient pulverized coal boiler system technology,economic and environmental benefits were analyzed. The results showed that the efficient pulverized coal combustion technology conformed to the energy situation of China. It saved a lot of land and drove the transformation of industry boiler,realized coal upgrading,energy-saving emission reduction areas concentrated heating target.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 136K]

  • Influence of heat loss from smoke exhaust on thermal efficiency of industrial coal fired boiler

    ZHANG Guoguang;SUI Yan;Research Institute of Coal Chemistry,Coal Science and Technology Research Institute Co. ,Ltd.;State Key Laboratory of Coal Mining and Environmental Protection;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;National Center for Quality Supervision and Test of Coal;

    The recently test data of 1205 coal fired industrial boilers was analyzed in the paper in order to research the influence degree and change law of heat loss from smoke exhaust and boiler thermal efficiency caused by exhaust gas temperature changing when the other parameters reached the qualified index according to GB / T 15317—2009. The four variation curves-boiler thermal efficiency-heat loss from smoke exhaust,heat loss from smoke exhaust-exhaust gas temperature,the proportion of heat loss from smoke exhaust in all boiler heat loss-exhaust gas temperature,boiler thermal efficiency-exhaust gas temperature,and their equation of linear regression were obtained for correlative research work. The results showed that,when the heat loss from smoke exhaust increased 1. 0%,boiler thermal efficiency reduced 1. 12%. When the exhaust gas temperature increased 10 ℃,heat loss from smoke exhaust increased 0. 5%,the proportion of heat loss from smoke exhaust in all boiler heat loss increased 1. 5%,the boiler thermal efficiency reduced 0. 6%.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 607K]

  • Key technical equipment and economic analysis of pulverized coal preparation and distribution system

    YU Qinghang;Energy Conservation and Engineering Technology Research Institute,Coal Science and Technology Research Institute Co. ,Ltd.;State Key Laboratory of Coal Mining and Environmental Protection;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

    Pulverized coal preparation and distribution center was the supporting system for efficient pulverized coal boilers,which was different from the pulverized coal preparation system in thermal power plant,It needed to adapt to the characteristics,which was the single boiler houses less fuel consumption,the regional demand for fuel boiler houses network more,so under the premise of safety and environmental protection must have centralism preparation and storage characteristics. Considering the characteristics of coal preparation center,this paper compared the coal preparation and distribution center system one-step and two-step production process,discussed the preparation of the key equipment of coal,drying,grinding and warehousing and distribution unit. In order to provide basis for selection on the construction project,finally the economic analysis was conducted. The results showed that one-step process covers an area of small,the investment cost is low,and potentially dangerous,two-step production operation was relatively safe,but an area was too large,investment was high,summed up the full automatic coal hot blast stove,Raymond mill machine and coal powder tank was different from thermal power plant coal pulverizing system of key equipment. This paper calculated per ton of finished product of coal processing costs about RMB 145.51,the railway transport price lowest was about RMB 621. 31,car transportation moderate price,the highest price of RMB 1733 delivery tanker. Taking Shendong coal preparation and distribution center as an example,the application was introduced from production,operation,environmental,automation.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 712K]

  • Determination method of fly ash desulfurization activity of NGD desulfurization

    LI Ting;Energy Conservation and Engineering Technology Research Institute,Coal Science and Technology Research Institute Co. ,Ltd.;State Key Laboratory of Coal Mining and Environmental Protection;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

    The mechanism of NGD desulfurization technology was that,the fly ash produced by pulverized coal boiler was used as desulfurizer to absorb sulfur dioxide in flue gas. The content of f-Ca O in fly ash determined the desulfurization activity. The paper explored a method for rapid determination of f-Ca O content in fly ash. Sulfonic acid reacted with f-Ca O to generate Ca SO3. The Na OH was used to neutralize excess H2SO3. The content of f-Ca O was calculated with H2SO3 dosage. The results showed that,the method was basically feasible,and it could be popularized in desulfurization of pulverized coal boiler after optimization and further validation.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 107K]

  • Briquetting factors of municipal sludge mixed with semi-coke powder

    LIN Hong;TENG Jilin;ZHANG Xuhui;ZHANG Yunpeng;WU Peng;QU Wanling;Beijing Guodian Futong Science and Technology Development Co. ,Ltd.;

    In order to study the impact of various factors on briquetting effect and prepare coal briquette with higher strength and calorific value using less binder in the process of municipal sludge and semi-coke powder briquetting,the study was conducted by briquetting factors experiments. Under laboratory conditions,as the basic raw material,the lignite semi-coke powder mixed with municipal sludge and binder,was applied to the briquetting experiment by using the pressure testing machine and the tester to pressure the strength of coal briquette,while adding different proportions of municipal sludge and binder,adjusting the molding pressure. During the experiment,the optimum process of sludge and semi-coke powder briquetting was obtained by optimizing various factors. The results showed that,under the conditions of briquetting pressure of 35 k N,the binder addition level of 2. 0%,and the sludge amount of 20%,the sludge semi-coke briquette with above 22 MJ / kg calorific value was produced,which provided a new way for high efficiency and cleaning treatment of municipal sludge.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 173K]

  • Resource utilization of municipal sludge

    SUN Haiyong;Energy Conservation and Engineering Technology Research Institute,Coal Science and Technology Research Institute Co. ,Ltd.;State Key Laboratory of Coal Mining and Environmental Protection;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

    In order to make an efficient use of large yield municipal sludge which was composed of complex components and was difficult to dispose,the source,yield and hazard of sludge were introduced in this paper. The shortage of traditional treatment process was also researched. Drying and incineration process,coal water slurry preparation could consume sludge,while the handing capacity was low. The compressive strengthen of briquette which was bonded with sludge was high,its gasification rate was above 50% than that of briquette bonded by white mud. The carbon adsorbent made from sludge had developed pore,large specific surface area and low cost. Its adsorption ability was around 80% of that of activated carbon. At last,the paper pointed out that sludge treatment process improvement,large scale equipment development,utilization methods expansion and secondary pollutants control were the key research directions of municipal sludge utilization.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 337K]

  • Remediation of petroleum contaminated soil by fly ash

    WU Cunxi;Yan'an Vocational and Technical College;

    To improve soil environment contaminated by petroleum and create a favorable condition for plants,the contaminated soil was treated by several processes. One process was just adding fly ash,another process was adding fly ash and planting alfalfa,the third process was just planting alfalfa. The degradation rate of petroleum hydrocarbon was also analyzed. The results showed that,the degradation rate of the above three processes in order were 4. 14% ~ 17. 18%,6. 6% ~ 30%,13. 4% ~ 60. 36%. The increase of fly ash addition improved the degradation rate of petroleum hydrocarbon. The addition of fly ash and biomass of alfalfa was positively correlated,and improved the germination rate of alfalfa.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 871K]

  • Research progress of coal desulfurization

    YUAN Jian;China Coal Tendering Co. ,Ltd.;

    To realize clean and efficient use of coal,the application,effects and development of desulfurization before combustion,sulfur fixation and post combustion desulfurization were analyzed. The results showed that considering cost,desulfurization before combustion was economical,the cost of post combustion desulfurization was enormous. Based on the data and information collected,desulfurization before combustion was the best development direction,sulfur fixation and post combustion desulfurization as supplementary means to be added.Actual application often combined many kinds of desulfurization methods,which was the development direction of desulfurization technology.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 123K]

  • Monitoring and analysis of CBM utilization projects in China

    FAN Jinlu;REN Shihua;HAO Jifeng;GUAN Beifeng;China Coal Research Institute;Coal Science and Technology Research Institute Co. ,Ltd.;

    In order to improve the production efficiency of coalbed methane( CBM) utilization projects in China,the CBM utilization situation in power generation and liquefaction were analyzed. The dispersed coal mines distribution,unstable CBM supplication,serious energy waste dragged the efficiency of CBM utilization projects. To solve these problems,the paper provided that,improving exhaust heat utilization efficiency,strengthening infrastructure construction,increasing science and technology investment would be the applicable.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 329K]

  • Adsorption ability of modified semicoke for dye waste water

    ZHAI Xiang;GAO Xiaoming;YI Peipei;FU Feng;College of Chemistry and Chemical Engineering,Shaanxi Key Laboratory of Chemical Reaction Engineering,Yan'an University;

    In order to prepare an efficient adsorption material,the semicoke prepared from Yan'an Zichang coal at low temperature was modified by chemical activation. The structure was characterized by XRD,Nitrogen adsorption isotherms and SEM. The adsorption ability of modified semicoke was investigated by changing the addition of semicoke,solution p H,adsorption time using rhodamine B and acid fuchsin as targets. The adsorption kinetics was also studied. The results showed that the correlation coefficient of pseudo-second-order model was above 0. 999 which indicated the saturated adsorption of model was close enough to the experimental results. The model could describe the adsorption accurately.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 1150K]

  • Research on mineralogical properties of fly ash

    ZHAO Yongbin;Performance Materials R & D Center,National Institute of Clean and-Low-Carbon Energy;

    To expand comprehensive utilization of fly ash,and further enhance the added value of fly ash products,the mineral composition and crystal structure of fly ash from Shenhua power plant was analyzed by X-ray diffraction( XRD) in this article. The results showed that,the mineral composition of fly ash was composed of amorphous and crystalline structure. Amorphous phase content ranged from 35%to 70% by crystallinity simulation calculation,and further found that mineral phase of fly ash mainly included mullite( 7% ~ 52%),quartz( 0 ~ 22%),and also some lime,magnetite,hematite,gypsum,anorthite,gehlenite,etc. In addition,the influence of coal composition and combustion mode on mineral composition of fly ash further was researched. Therefore,it was easy to learn about the characteristics of fly ash and increase the high-added value.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 1314K]

  • Primary geological controlling factors of coalbed methane enrichment and its exploration potential in Southern Shizhuang Block

    GUO Guangshan;XING Liren;New Energy Research Center,China National Offshore Oil Corporation Research Institute;

    The Southern Shizhuang block was analysed in details on the base of coalbed methane( CBM) enrichment controlled factors and exploration potential in the paper. Firstly,the main control factors of CBM enrichment were analyzed from the aspects of sedimentary environment,hydrogeological conditions and geological structure. The results showed that,the roof and floor of No. 3 coal seam were mainly composed of thick mudstone. The roof of No. 15 coal seam was huge thick limestone deposition. The sealing ability was good,and it was good to CBM preservation. In the study area,the groundwater flowed from the southeast of high potential energy to the northwest of low potential energy. CBM desorption and diffusion happened under the influence of hydraulic migration. CBM was enriched to some extent. Sitou fault of good sealing ability could be used as the lateral boundary of CBM enrichment. The gas content in the east of the fault increased. At last,CBM exploration potential was analyzed based on coal reservoir parameters. It was promising to exploit CBM in No. 3 and No. 15 coal seams because of the thick seam,high coal rank,moderate burial depth,high CBM content and gas saturation. However,the permeability of coal reservoir was relatively low,and it was greatly influenced by the minimum principal stress. The abnormally high stress area should be avoided when taking fracture measures.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 1966K]

  • Influencing factors of denitrification technology by activated coke

    FU Yuemei;PAN Min;ZHANG Jiushan;LIU Jing;Shanghai Clear Environmental Protection Technology Co. ,Ltd.;

    To improve denitrification efficiency of activated coke,the influence of temperature,humidity and oxygen concentration on activated coke were investigated by orthogonal design,which was carried out on a fixed bed reactor. The results showed that the influence from great to small as follows: humidity,oxygen concentration,temperature. Within the range of parameters,the denitrification rate decreased with the rise of temperature,while the downward became slower at a certain temperature. The denitrification rate was linearly inverse proportional relationship with water content,while in linear proportion relationship with oxygen content. The denitrification rate became worse with the higher water content and lower oxygen concentration. When the humidity,oxygen concentration and temperature was 2%,10% and 60 ℃respectively,the denitrification rate was greater than 80%. The research provided basic data for design of activated coke flue gas denitrification engineering projects.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 359K]

  • Influence of heating temperature on micro-emulsion preparation

    LIU Yifang;ZHAO Xinnan;Mine Oil Products Branch,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;

    Microemulsion was a hydraulic fluid transmission medium which combined the characteristics of emulsion oil and concentrated liquid. The preparation time and microemulsion characteristics were influenced by charging sequence,heating temperature and heating methods. The results showed that,when t1 was above 110 ℃,t2 was 70 ℃,the combination properties of microemulsion were the best. Once the OP-10 was added,the stability behavior became worse with the increase of heating temperature. The optimum condition was that,the saponification temperature t1 of oleic acid and triethanolamine was 110 ℃,the reaction temperature t2 was 70 ℃,and there was no need to heat after adding OP-10.

    2015 04 v.21;No.98 [Abstract][OnlineView][Download 416K]



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