2016年04期目次

  • Influence of particle size on compressive strength of fly ash based-geoploymer

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

    To make full use of fly ash,a fly ash based-geoploymer was prepared using alkali activated fly ash as raw material.The influence of particle size and distribution of fly ash on compressive strength of fly ash based-geopolymer was studied.The results showed that,for different particle size of fly ash with unimodal distribution,with the decrease of median diameter D_(50),early compressive strength and 28 days compressive strength of fly ash based-geopolymer significantly increased.For same D_(50) with unimodal and bimodal distribution of fly ash,the compressive strength of geopolymer using fly ash with unimodal distribution as raw material was slightly lower than that of geopolymer using fly ash with bimodal distribution.the results also indicated that particle size( D_(50)) was one of the important factors to affect the performance of fly ash based-geopolymer.Therefore,the compressive strength of fly ash based-geopolymer could be improved by adjusting the particle size and distribution of fly ash,the research provided a theoretical basis to control the compressive strength of fly ash based-geopolymer.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 232K]

  • Preparation and performance analysis of ultrafine desulphurization ash

    LI Peng;WU Jianfang;WU Jingfei;SHI Longlong;CHEN Fangqin;Shanxi Pingshuo Gangue-fired Generation Co.,Ltd.;Shuozhou Juguang Building Materials Development Co.,Ltd.;Key Laboratory of Coal Power Pollution Control and Resource Utilization;

    To improve the performance of desulfurization ash,the ultrafine ash was prepared by kinetic energy mill with steam.The applied direction of ultrafine desulfurization ash was preliminary explored through analyzing the performance of ultrafine desulfurization ash and original ash.The results showed that the grain size of the ultrafine desulphurization ash which was prepared by kinetic energy mill with steam could be controlled.Thedispersion degree of particle of the ultrafine ash with narrow grain size distribution was high and the specific surface area was larger.Compared to the cement mortar withoriginal ash,the water ratio of cement mortar with ultrafine desulfurization ash which median diameter was 3. 7 μm was reduced to 95% and 28 days activity index increased to 101%. The ultrafine desulfurization ash could applied to the field of building materials as cement admixture and concrete admixture due to its excellent performance.In order to enhance the utilization level and added value of desulfurization ash,the utilization and utilization way of ultrafine desulphurization need further study.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 201K]

  • Numerical simulation of dense phase pneumatic conveying for fluidizing transporter

    CHEN Long;CUI Yuhong;LIU Yu;GUO Fei;WANG Yongying;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 industrial pulverized coal boiler room,the fluidizing transporter of bag-type dust collector was used to transport the fly ash.In order to determine the most suitable blowing time and reduce the consumption of compressive air,the Fluent software was used to simulate the process in unsteady state and the boundary condition was set by reality in industrial production.The state of solid and gas phases of 0. 4s,1. 0 s,1. 6 s,2. 2 s,2. 8 s and 3. 4 s after the start of blowing were compared in fluidizing transporter.The results showed that the fly ash amount reached to the maximum in 1.0 s after the start of pneumatic conveying.During this period,the fluidizing transporter was occupied by back flows of gas phase and the vector distribution of entrance velocity was irregular.The fly ash amount gradually decreased and basically ended at 3.4 s.At last,the appropriate length ranged from 4 s to 5 s.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 301K]

  • Progress of extracting oxide from fly ash

    QIN Jianbo;FAN Rendong;FANG Ying;HE Fujun;Materials Science and Engineering,Nanjing University of Technology;Jiangsu Electric Power Design Institute;

    In order to make full use of fly ash and reduce its pollution,the chemical composition,mineral composition of fly ash were introduced.The potential value and main problems of extracting Al_2O_3 and SiO_2 from fly ash were investigated. Three main extraction methods which were acid process,alkaline process and combination of acid and alkaline process as well as their advantages and disadvantages were presented in this paper.High cost,high equipment requirement and secondary pollution limited the industrial application of the technology.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 160K]

  • Characteristics of fly ash and slag in circulating fluidized bed under different conditions

    MA Zhibin;CHANG Keke;YAN Kezhou;ZHANG Peihua;CHENG Fangqin;State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources,Shanxi University;Shanxi Pingshuo Gangue Power Generation Co.,Ltd.;

    To expand comprehensive utilization of fly ash formed in circulating fluidized bed and develop its utilization technologies,the characteristics including particle size distribution,chemical composition,mineral matters and microscopic morphology of fly ash and slag formed in circulating fluidized bed under different conditions were investigated. The leaching ratio of aluminum oxide in fly ash was also studied.The results showed that the effects of load on particle size distribution,chemical composition and mineral matters of fly ash and slag were negligible.The leaching ratio of aluminum oxide in fly ash was high when there was much pore and crack on the surface of ash. The content of amorphous matters in fly ash was more than 70%.The calcium oxide existed in fly ash mainly in the forms of anhydrite,lime and amorphous matter.The aluminum oxide existed in fly ash only in the form of amorphous matter,and the content of aluminum oxide in fly ash was higher than in slag.The contents of quartz and anhydrite in the slag were more than those in the fly ash obviously.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 318K]

  • Mineralogy properties comparison of PC fly ash and CFB fly ash

    WANG En;Mine Safety Technology Branch of China Coal Research Institute;National Key Lab of Coal Resource High Efficient Mining and Clean Utilization;

    In order to improve the utilization of fly ash,the chemical composition analysis,scanning electron microscope( SEM),X-ray diffraction spectrum( XRD) analysis and nuclear magnetic resonance( NMR) were carried out to characterize the morphology,phase composition and activity of fly ash.The mineralogy properties between pulverized coal furnace( PC) fly ash and circulating fluidized bed( CFB)boiler fly ash were compared.The two fly ash showed big differences in morphology and phase composition.There were large amount of glass beads and crystalline mineral in PC fly ash while amorphous glassy substance was the main component in CFB fly ash.There was no glass beads in CFB fly ash due to lower fly ash formation temperature.The NMR analysis showed that the polymerization degree of silica and alumina structure was high in PC fly ash which had a blocking effect on active component dissolution.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 233K]

  • Settlement velocity of fly ash under industrial pulverized coal boiler

    LUO Wei;JIA Dongliang;LI Dianxin;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 accelerate settlement velocity and discharge speed of fly ash under industrial pulverized coal boiler,ensure stable operation of boiler,the influence of fly ash characteristics,combustion condition of fly ash and structure of ash hopper on settlement velocity of fly ash was investigated.Particle size of fly ash,combustion adequacy of fly ash,ash hopper height,side wall's inclination of ash hopper were the research emphases. The results showed that,smaller particles had slower settlement velocity,thin mud accumulated in scraper chain conveyor was mainly composed by particles whose diameters were less than 0.009 mm.When the coal couldn't burn completely,a minority of fly ash couldn't dissolve in water and the descent velocity was slow.Settlement velocity of the fly ash got slower by increasing the side wall gradient or decreasing ash hopper height.Thus,the inclination of side wall should be in 10° and the vertical height of ash hopper should be designed as high as possible.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 123K]

  • Feasibility analysis of extracting alumina from fly ash in reaction kettle

    ZHANG Shixin;HAN Ying;LI Li;Huaneng Clean Energy Research Institute;

    Reaction kettle had the advantages of uniform temperature,flexible standing time and better adaptability. Based on the reaction process characteristics of aluminium oxide extraction from fly ash by ammonium sulfate method,the feasibility of extracting alumina from fly ash in reaction kettle was studied.The results showed that,the method was feasibility,while the flow regime time was different from the reaction time among materials.The extraction efficiency of aluminium oxide was only 58.18%.The extraction efficiency was influenced by ammonium sulfate amount,reaction time,premixing and fly ash particle size.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 163K]

  • Preparation and application of fly ash modified by polymethylacrylic acid

    GONG Ming;ZHANG Dongdong;QU Jianlin;YU Wei;School of Chemistry and Chemical Engineering,Xi'an University of Science and Technology;

    In order to increase sewage purification of fly ash,the surface grafting of hydrophilic monomers was used to improve the surface hydrophilic and contact with water.The modified fly ash was prepared by free radical polymerization of methacrylic acid and fiy ash. The modified fly ash was characterized by the water absorption,IR,TG and SEM.The coal slime sedimentation experiments of the modified fly ash were also conducted.The results suggested that the method of modified FA-MA20 had a good flocculation ability of coal slurry through grafting polymerization of methacrylic acid. It was an important application prospect for the comprehensive utilization of fly ash and the treatment of coal slurry by improving the hydrophilicity of fly ash surface.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 294K]

  • Determination of f-Cao content in fly ash for NGD desulfurization

    LI Ting;Coal Science and Technology Research Institute;State Key Laboratory of Coal Mining and Clean Utilization;Energy State Key Laboratory of Coal Efficient Utilization and Energy-Saving Equipment;

    In order to evaluate the desulfurization activity of fly ash rapidly which was used for NGD desulfurization,the content of f-CaO in several fly ash samples were determined by sucrose extraction and EDTA titration method.Under certain conditions,the content of f-CaO of pure fly ash was about 7%.As 0.5% and 1% slaked lime were added to the ash,the content of f-CaO increased to 7. 43% and 7. 89%.The titration results were close to the calculated values.Through the desulfurization effect test,the desulfurization efficiency of the sample was consistent with the f-CaO content. The operation was simply. As an auxiliary means to evaluate the desulfurization activity of fly ash used in NGD desulfurization,the method had strong practical value.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 101K]

  • Application of fly ash in wastewater treatment

    XIAO Cuiwei;Coal Science and Technology Research Institute;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;

    In order to make full use of fly ash in coal-fired power plant to dispose wastewater,the chemical and physical properties of fly ash and working principle of wastewater treatment were introduced.The application of fly ash in the treatment of domestic wastewater,printing and dyeing wastewater,heavy metal ion wastewater,fluoride wastewater,papermaking wastewater and other wastewater were analyzed.The results showed that the removal efficiency of all kinds of pollutants in wastewater could reach more than 57% under appropriate condition,which indicated that it was feasible to treat wastewater using fly ash.The modification of fly ash and secondary pollution treatment were the focus of further research.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 142K]

  • Research on fly ash policy in China

    SU Yu;FANG Huafeng;China International Engineering Consulting Corporation,Resources and Environment Department;

    In order to promote the development of comprehensive utilization industry of fly ash,the application problems of fly ash policy in China were analyzed based on the supportive policies of fly ash.The results showed that the pertinence was not strong,the standard system was not perfect enough,the preferential tax policies were not enough and so on.The comprehensive utilization of alumina powder fly ash and emission fee should be strengthened.A state-dominated technology research and development system should become emphasis. The thirdparty involvement in fly ash regulation also had broad prospects.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 108K]

  • Industry chain of circular economy based on clean and efficient use of poor quality coking coal

    LUO Teng;CHEN Guifeng;Shenhua Science and Technology Research Insititute Co.,Ltd.;Research Institute of Coal Chemistry,Coal Science and Technology Research Insititute Co.,Ltd.;

    To realize clean and efficient use of the coal of Shanghai Temple mine area in Ordos,the coal properties,appropriate technologies,industrial policies and existing industrial base were analyzed.The coal properties showed high-ash medium-sulfur,low-ash high-sulfur,high ash fusibility,high oil ratio and strong caking property.The gasification was not suitable for high-ash medium-sulfur coal,which should be separated first,then the products was supplied to coking plant. The combination of pyrolysis and gasification was the proper choice for low-ash high-sulfur.The coal staged conversation and the combination of coking and gasification were the main bodies of the industry chain of circular economy.The chain could use high-sulfur coal and low-sulfur coal effectively,the products were fine chemicals such as polyformaldehyde and methylal.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 210K]

  • Preparation of flocculant CPSA and experimental study on coal slime water settlement

    LIU Yaxing;LYU Yibo;ZHANG Naixu;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University;School of Mining Engineering,Heilongjiang University of Science & Technology;

    In order to settle serious-sliming slime water,the composition of serious-sliming slime water was analyzed using laser particle size analyzer,XRD and XRF.Soluble starch( SS) and cationic polymeric flocculant CPSA were analyzed by FT-IR and SEM.The serioussliming slime water was settled by adding CPSA and polymeric ferric sulfate( PFS).The results showed that-5.5 μm ultra fine particles in slime reached 52%,-29 μm ultra fine particles in slime was above 90% which led to difficult slime settlement. The composition of slime water and size distribution had significant impact on settlement of serious-sliming slime water. The combination of CPSA and PFS could save flocculant dosage 62.5% over flocculant alone,the settling velocity could be improved by 2 mm / s.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 229K]

  • Preparation and flotation performance of ultrasonic microemulsified collector for slime

    LI Lin;CUI Guangwen;LIU Huijie;YOU Xiaofang;Chemical and Environmental Engineering College,Shandong University of Science and Technology;

    In order to improve the dispersion of hydrocarbon oil in water,a diesel microemulsified collector was prepared through microemulsifying technology.The ultrasound was used to further disperse the collector.The influence of ultrasonic frequency,ultrasonic power and time on the performance of collector was investigated. The results showed that,when the ultrasonic frequency was 20 k Hz,the ultrasonic power was 400 W,the treatment time was 15 min,the dispersion effect was the best. The average particle size of ULY could reach16. 39 nm.The slime flotation test showed that,when the dosage of diesel,LY and ULY were 900,800,750 g / t respectively,the best improved flotation index were 58. 58%,62. 87% and 62. 25%. After microemulsion,less collector could achieve better dispersion effect. The diesel saving ratio of LY and ULY could reached 72. 22% and 73. 96%. In addition,the dosage of ULY consumption decreased by 50 g / t compared with LY while the similar separation index was close.Ultrasonic microemulsion could form more small oil drop,which helped to improve separation efficiency and reduce the collector dosage.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 184K]

  • Similar amplification method of XJM-S flotation machine

    ZHANG Peng;Tangshan Branch,Tiandi Science & Technology Co.,Ltd.;Coal Separation Engineering & Technology Research Center of Hebei Province;

    In order to improve the research and development efficiency of large flotation,a similar amplification method was needed.A geometric similarity model was established in this paper based on the working characteristics of mechanical flotation machine,the key technical parameters of flotation machine were determined according to the model.Based on the calculation of stirring in liquid mixing,two amplification criteria were adopted which were linear speed constant and constant unit volume power constant,a dynamic similarity model of flotation machine was established.The main dynamic parameters of flotation machine were determined.Taking XJM-S16 flotation machine as calculation model,the empirical constants in the geometric model and dynamic model were determined. A XJM-S20 flotation machine was designed by the two methods.The results showed that,the linear speed constant method could get the same aeration rate.It was a better choice for flotation design.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 132K]

  • Evaluation and application of coking coal based on coal microstucture

    PANG Keliang;LIU Dongjie;WANG Mingguo;ZHAO Hengbo;WANG Chao;Anshan Iron and Steel Group Corporation;

    To optimize coking coal structure of Bayuquan Branch,an automatic intelligent analysis system was adopted to analyze the petrology characteristics of different coking coals.Based on the property indexes of traditional coking coal,the property characteristics of coking coal were analyzed and the coal petrography was used to adjust coal varieties and ratios.The results showed that,according to coal petrography classification criteria,60.2% of coal consumed by Bayuquan branch was coking coal,31. 6% was fat coal.More than 60% of imported coal was single coal and the quality of imported coal was homogeneous property,while the domestic coal was a mixture of several coals and the single coal was lower than 20%.The coal petrography was inserted into coking coal evaluation.The crushing strength( M_(40)) increased from 88. 11% in 2011 to 88.87% in 2013,the abrasive resistance( M_(10)) reduced from 6. 75% in 2011 to 6. 38% in 2013.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 227K]

  • Relationship between CRI and coal submacerals

    PEI Xianfeng;Research Institute of Coal Chemistry,Coal Science and Technology Research Insititute Co.,Ltd.;National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;

    In order to reveal the effects of coal properties on coal reactivity index( CRI),the relationship between CRI and C1,C2,F,Ma from coal submacerals were analyzed,their influence on CRI were investigated.The results showed that the CRI was the smallest when the contents of C1,C2,F and Ma were 37%~46%,19%~30%,11%~13%,3%~6% respectively.C1 and C2were helpful to form a CRI structure with lower CRI.Under the same metamorphic,C1 was more conducive to form the lower CRI structure. Compared with F,Ma played a stronger blocking effect on the formation of low CRI structure.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 211K]

  • Slurryability of semi-coke from Kuangou coal pyrolysis

    LI Xuan;LU Haiyun;HE Lixin;GUO Yi;National Institute of Clean-and-Low-Carbon Energy;

    In order to prepare high concentration CWS,Kuangou coal was used as raw material to produce semi-coke under different pyrolysis condition.The experiments were conducted on a moving bed reactor using nitrogen gas as heat- carrier. The results indicated that the concentration of semi-coke was higher than that of Kuangou coal. The apparent viscosity of semi- coke slurry decreased with the increase of pyrolysis temperature and retention time.The concentration of Kuangou CWS could be increased from 61.15% to 67.78% by pyrolysis.The fluidity of semi- coke CWS was improved and the yielding stress and consistency coefficient were decreased. The increase of metamorphic grade of semi-coke,decrease of volatile matter and oxygen-containing functional group led to better slurryability.However,the water retention capacity of semi-coke and the free water content between particles in the slurry were reduced during pyrolysis,which led to poor semi-coke stability.Taking the semi-coke prepared at 640 ℃ and raw coal as research objects,When the concentration of both were 66%,the water separating proportion of raw coal CWS and semi-coke CWS were 4.0% and 14.0% respectively.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 254K]

  • Influence rule of low-level bituminous on thermoplasticity of conventional coking coal

    ZHENG Mingdong;LI Yuhang;GAO Zhifang;ZHANG Xiaoyong;Department of Chemistry and Chemical Engineering,Anhui University of Technology;School of Metallurgy Engineering,Anhui University of Technology;

    In order to improve the addition of low-ash low-sulfur para-bituminous coal during coal blending,the influence of para-bituminous coal vitrinite on mobility,expansion and caking index and other factors of conventional coking coal which were gas coal,fat coal,coking coal were investigated.With the increase of vitrinite,the above three indexes decreased. When the vitrinite was 12%,the mobility of gas coal,fat coal,coking coal decreased by 70.0%,66.1%,78.4%,and the caking index decreased by 31.8%,9.4% and 45.7%.When the addition of vitrinite was 8%,the expansion of gas coal,fat coal,coking coal reduced from 1.3% to- 19.5%,from 158.7% to 88.2%,from28.5% to-1.2%.There was no linear relationship among the indexes.The change of vitrinite amount had the largest impact on coking coal,the interaction was negative.The change of vitrinite amount had the smallest impact on fat coal,the interaction was positive.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 137K]

  • Iron-based catalyst reaction performance for Fischer-Tropsch synthesis in slurry reactor

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

    In order to get the effect law of process parameters on iron- based FTS( Fischer- Tropsch synthesis) product distribution. The effects of reaction conditions including temperature,pressure,space velocity,H_2/ CO ratio on FTS performance on iron- based catalyst in slurry reactor were investigated.With the increase of temperature,the catalytic activity,CH_4 selectivity increased,the products were mainly the light hydrocarbon.With the increase of pressure,catalytic activity and CO_2 selectivity increased,CH_4 selectivity decreased.With the increase of H_2/ CO ratio,the catalytic activity and CH_4 selectivity increased,CO_2 and C_(5+)selectivity decreased.With the increase of space velocity,the catalytic activity and CO_2 selectivity decreased,CH_4 selectivity rose,C_(5+)was mainly the light hydrocarbon. When the reaction conditions were properly controlled,reaction performance and the economic benefit of FTS could be effectively improved,the length of carbon chain and product distribution were controlled.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 165K]

  • Improvement of catalysts activity for direct coal liquefaction

    LIU Hua;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;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

    In order to prepare efficient direct coal liquefaction( DCL) catalyst,methods of enhancing the activity of DCL catalyst were summarized,which mainly included enhancement of the catalyst precursor dispersion,inhibition of active phase agglomeration and synergistic effect of multi-metallic / non-metallic catalysts.The impact mechanisms on performance of DCL catalyst was discussed followed by analyzing the key and difficulty of these methods.Instead of isolating these methods,one should integrate these methods to improve the activity of DCL catalyst.In view of the existing problems in the DCL catalyst research filed,some suggestions had been proposed regarding the future research orientation.Much emphasis should be put on investigating the effect of ash component of coal varieties on the performance of DCL catalyst,the effect of non-metallic element on hydrogenation and coke inhibition performance of the catalyst,and exploring various collaborative composite catalyst preparation system.The ultimate goal was to develop highly efficient specific DCL catalyst in terms of different coal varieties.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 130K]

  • Feasibility of maleic anhydride method in determining diene value of coal-based liquid product

    SUO Ya;ZHU Yufei;National Institute of Clean-and-Low-Carbon Energy;

    In order to study the feasibility of maleic anhydride method in determining conjugated dienes content of coal-based liquid product,the influence of phenols in coal tar,coal tar free of phenol,phenolics and alcohols in Fischer-Tropsch oil on maleic anhydride method determining diene value were investigated.The results showed that,the diene value of mid-low temperature coal tar was 15. 17 g / 100 g,through dephenolization,the diene value was 5. 65 g / 100 g. Phenol,cresol,dimethyl phenol had no obvious effects on maleic anhydride method.Both of other acidic components in coal tar and alcohols in Fischer-Tropsch oil had significant effects on determination results.The alcohols in Fischer-Tropsch oil could react with maleic anhydride,so the maleic anhydride method was not suitable for determination of diene value in Fischer-Tropsch oil.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 122K]

  • Solubility prediction of H2 in mixed solvent of coal liquefaction oil by BP neural network

    LUO Huafeng;Coal Engineering College,Shanxi Datong University;

    In order to meet the requirement of design and operation during coal oil industrialization,the practical H_2 solubility in the mixed solvent of Shenhua coal liquefaction oil was tested first,then the capacity of predicting H_2 solubility in system was investigated by artificial neural network.The results showed that the calculation precision of neural network increased with the increase of cling times. For different mixed solvent,the relative error between calculated value and experimental value gradually decreased with the increase of hidden layer quantity.To reduce calculation amount,the hidden layer quantity were set as four.The maximum relative error of 3-4-1 network for solubility of hydrogen in different mixed solvent was 4.48%.The model could meet the need of predicting solubility of H_2.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 178K]

  • Co-pyrolysis of Shendong coal and direct coal liquefaction residue

    GAO Peng;SUN Renhui;LIU Aiguo;LU Haiyun;CHEN Aiguo;National Institute of Clean-and-Low-Carbon Energy;

    In order to make full use of direct coal liquefaction residue( DCLR),the co- pyrolysis experiments of Shendong coal and direct coal liquefaction residue were done.The influence of particle size of Shendong coal and DCLR,DCLR proportion on product distribution and semi-coke strength were investigated.A testing method for semi-coke strength was established. The results indicated that the dry basis of tar increased with the increase of DCLR proportion.The DCLR had synergistic effect on tar generation.When the dosage of DCLR below 1 mm increased from 10% to 30% and the particle size of Shendong coal ranged from 3 mm to 6 mm,the tumbler strength of co-pyrolysis semi-coke increased by 29.3%,the friability decreased by 22.8%.When the particle size of Shendong ranged from 3 mm to 6 mm,the addition of- 1 mm liquefaction residue had greater effect on tumbler strength and friability of semi- coke. When the particle size of Shendong coal was below 3 mm and direct coal liquefaction residue was below 1 mm,the tumbler strength was reduced and the friability was enhanced.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 206K]

  • Progress and development of coal chemical industrial wastewater treatment technologies

    LU Xiaoquan;China Coal Technology and Engineering Group Co.,Ltd.;China Coal Research Institute;

    Rapid development of coal chemical industry brought water pollution problem.The effectiveness of treatment of coal chemical industrial wastewater could determine the healthy development of coal chemical industry in China. In this paper,the characteristics of wastewater coming from coal coking,coal gasification and coal liquefaction process were introduced. The development of wastewater treatment technologies,both at home and abroad,such as pretreatment,biochemical treatment and advanced treatment,was discussed,and the development of coal chemical wastewater treatment technologies was also prospected.Many scholars' studies showed that,the coal chemical industrial wastewater could meet the discharge standards through the proper combination of a variety of processing technology.The advanced treatment technology,such as advanced oxidation,membrane separation,was the focus of future development,as the difficult treatment of the complexity of coal chemical industry wastewater.In addition,reducing processing costs and improving processing efficiency were the inevitable trend of the coal chemical industrial wastewater treatment technologies.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 115K]

  • Experimental study of low concentration coalbed methane by pressure swing adsorption

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

    In order to study the effects of self-made carbon molecular sieve on low concentration coalbed methane concentration,a kind of low concentration coalbed methane was thickened whose CH_4 concentration was 25% by pressure swing adsorption. Activated carbon was chosen as a comparison.The influence of adsorbent pressure,adsorbent time on concentration effects was investigated. The results showed that,with the improvement of adsorbent pressure,the performance got better first,then became worse.The concentration effect was the best when the adsorbent pressure was 200 k Pa.The concentration speed increased rapidly first,then decreased slowly. The best adsorbent time was 120 s.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 199K]

  • Study on PCB wet desulfurization dust collector

    WANG Jia;Tangshan Tianhe Science and Technology Development Co.,Ltd.;

    Fine slime inevitably led to a great deal of dust during separation of solid and liquefaction,so it was necessary to capture the dust.Desulfuration was also essential in order to comply with the state laws of environmental protection.Based on the technologies at home and abroad,a new type wet desulfurization dust collector was developed. The wet limestone-gypsum desulfurization process was adopted.The working principle of the collector was that,the SO2 in the dust reacted with quick lime slurry.The industrial application showed that,the collector met the requirements of dust emission standards,with the advantages of simple structure,low cost,high efficiency and stable operation.The dust removal efficiency,desulfurization efficiency could reach 97. 8% and 89%,the equipment resistance was less than1 100 Pa.

    2016 04 v.22;No.104 [Abstract][OnlineView][HTML全文][Download 105K]



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