• Fuel oil and electricity poly-generation technical routes on coal low medium temperature pyrolysis technology

    ZHANG Zhi-gang,MIN Xiao-jian,SHANG Jian-xuan,ZHENG Hua-an(Shaanxi Coal and Chemical Technology Institute Co.,Ltd.,Xi'an 710065,China)

    To resolve problems in fuel oil and electricity polygeneration technical routes on coal low medium temperature pyrolysis technology,analyse core technologies development and their application in the field of coal clean conversion on the basis of coal quality.The results show that,developing this technology need to pay more attention to its technology development,system integration,operation management and potential competition and the like.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 406K]

  • Dry separation of Kuangou ultra low-ash coal with dense medium separator

    YU Xiao-dong1,LI Gong-min1,ZHAO Yue-min2,LI Mei-ju1(1.Shenzhou Manufacturing Group Co.,Ltd.,Tangshan 063001,China; 2.School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221008,China)

    Introduce the operating principle of dry dense medium separator,analyse the property of Kuangou raw coal Shenhua Group.The results illustrate that the Kuangou coal is extremely difficult to separate.To determine whether the clean coal meet the need for activated carbon preparation,respectively separate three kinds of Kuangou raw coals whose particle size range from 80 mm to 3 mm,50 mm to 6 mm,30 mm to 13 mm.Meanwhile,compare the separation precision of the separator.After separation,detect the ash content of the clean coal,find that they are 3.94 percent,3.92 percent and 3.71 percent respectively.The probable error Ep is 0.080,0.060 and 0.045.So the raw coal ranging from 30 mm to 13 mm is the best material,both ash content and Ep of clean coal are the lowest,the separation precision is the highest.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 726K]

  • Transformation of slime water processing system in Pingshuo No.2 coal preparation plant

    DING Jian-wei,WANG Xiao-bin,LIANG Shi-hong(No.2 Coal Preparation Plant,China Coal Pingshuo Group Co.,Ltd.,Shuozhou 036006,China)

    The analysis of raw coal and slime nature,slime treatment processes of No.2 coal preparation plant,indicates that large native slime and secondary slime,high fine content in slime,long filtration cycle of pressure filter make it harder to process slime in middings coal.Through adjusting the capacity of transporting system,changing working condition of filter and pore size of strainer,improving the handling capacity of slime high frequency screen,establishing new automatic dosing system,choosing chemicals to treat slime water and other measures,reduce suspended solids and supernatant turbidity in the water of thickener,the circulation amount of fine particles in the thickener also decrease.The concentration of washing water is significantly lower than the national environmental standards.The slime infiltrating into coarse particle recovery system further dehydrate,then mix with clean coal products,this process lightens the treatment capacity of thickener,keeps balance of slime output and system productivity.After transformation,the average daily processing capacity of ultra difficult separation coal increase from 3.5×104 tons to 4.5×104 or 5×104 tons,the economic benefits is significant.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 560K]

  • Application of four size fraction coal preparation process in Handan coal preparation plant

    SHEN Rui-hong(Handan Coal Preparation Plant,Jizhong Energy Fengfeng Group Co.,Ltd.,Handan 056041,China)

    The four size fraction coal preparation process in Handan coal preparation plant has remarkable technical characteristics such as sophisticated,digitized,international,integrated and simplified.Analyse its effect through carrying out the check tests for pressureless three-product dense medium cyclone and CSS coarse slime separator.Its operation helps large-diameter hydrocyclone better prepare fine coal,improve the separation precision of cyclone,obtain qualified clean coal.The practical yield is 58.88 percent,the quantity efficiency is 95.96 percent,the possible deviation Ep1,Ep2 is 0.025,0.055,the medium consumption for each ton of raw coal is only 0.65 kg,the ash of final clean coal gotten by CSS coarse slime separator is around 9.00 percent,the average field of clean coal is 81.25 percent,the quantity efficiency is 98.52 percent,Ep is 0.07,the coal ranging from 1.0 mm to 0.5 mm could be accurately separated.The process combining desliming,pressureless,four size fraction,slime two-stage concentration and two-stage recovery techniques can nicely separate coal.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 741K]

  • Washability analysis of two Taixi anthracite

    ZHOU Ya-bei,XU Pu-cha(Carbon Materials R&D Center,Taixi Coal-based Industry Co.,Ltd., Shenhua Ningxia Coal Industry Group Co.,Ltd.,Shizuishan 753000,China)

    Based on the coal quality characteristics of Hongliang raw coal and Baijigou raw coal,carried out the screening and float-and-sink analysis to investigate their washability.The screening analysis show that those two Taixi coal possess similar granularity group,mainly in the middle of coal sample size,small and large sizes are relatively small.The highest yield of Hongliang raw coal whose granularity ranges from 8 mm to 2 mm is 38.18 percent,while that of Baijigou raw coal whose granularity ranges from 20 mm to 8 mm is 31.74 percent.Comparing those two coal with same granularity,the ash of various size for Hongliang raw coal are smaller than those for Baijigou raw coal and the ash of intermediate size fractions is the lowest.The minimum ash of 20 mm to 8 mm is 2.86 percent for Hongliang raw coal,7.11 percent for Baijigou raw coal.Float-and-sink analysis show that,if the ash content of ultralow ash clean coal is less than 3.10 percent,the theoretical yield of clean coal reaches up to 97.70 percent,and the "Easy choice" for δ±0.1 content is only 1.91 percent,the theoretical yield of clean coal is only 79.80 percent,and the "Easy choice" for δ±0.1 content is only 21.90 percent.The theoretical yield of clean coal reaches 93.60 percent,and it is "Difficult choice" for δ±0.1 content is 30.60 percent while the ash content of lowash clean coal is less than 6.00 percent.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 641K]

  • Design of waste stone exhaust system in Tianchi coal preparation plant

    SUN Zeng-yong(Heshun Tianchi Energy Co.,Ltd.,Yankuang Group Co.,Ltd.,Jinzhong 032700,China)

    The analysis of raw coal proximate analysis,ultimate analysis and processing property show that No.15 coal is high ash,medium-and-high sulfur meagre coal,which is easy to wash.Based on the technological process,deduce the data quality equation process and hydrologic budget.The results show that,the separation index of inclined lifting wheel separator δp is 1.80 g/cm3,Ep is 0.04,the mass fraction of secondary slime is 4 percent,magnetic separation efficiency is 99.80 percent,liquid-solid ratio of concentrated liquid underflow is 3.0.The moisture of lump clean coal,coarse slime and fine slime is respectively 8 percent,26 percent and 21 percent.The water inflow is equal to water outflow.To adopt advanced,reliable and effective devices,conduce model section calculation for major devices in coal preparation plant.The average medium consumption one year are 0.8 kg/t,power consumption are 1.35 kWh,the mass fraction of coal mixed in gangue is less than or equal to 3 percent,the qualified rate of lump coal Ad and mixed coal Qnet,ar is more than or equal to 98 percent.The retained benefits for each year is 2×107 yuan.Since a series of great advantages of the improved technological process,it provides reference for the transformation of other coal preparation plants.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 717K]

  • Medium preparation techniques

    WANG Guang-ze,LV Jian-xiong,WEI Hua-zhen(Baode Coal Preparation Plant,Preparation Center of Shendong Coal Group Co.,Ltd.,Xinzhou 036600,China)

    Introduce four common medium dosing and preparation processes which are dry-type,fresh suspension-qualified medium bucket,fresh suspension-dilute medium bucket,medium-dosing magnetic separator medium-dosing process.After transformation,designed concentrate cyclone medium-dosing process and automatic medium-dosing process,then analysed the effect of those two processes.The results show that,without additional power equipments and floor space,the former process is much simpler and more reliable,into which the high density medium can be added,the total investment including equipments and energy consumption of the former process is less 105 yuan than that of magnetic separator medium-dosing process.The automatic medium-dosing process adopts partial drop-dead halt,makes full use of the current potential energy,the high density medium can be added continuously and automaticmatically.Its recovery is much higher.Taking one coal preparation plant as sample,whose medium consumption once was five tons one day,adopting the automatic medium-dosing process,it decrease by 50 percent in the course of preparing,in other words,120 tons one year,economic benefits increases by 1.8×105 yuan,saves one laborer.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 695K]

  • Dosing system transformation in Wobei coal preparation plant

    ZHU Gan-bin1,2(1.College of Mining and Safety,Anhui University of Science and Technology,Huainan 232001,China; 2.Huaibei Coal Preparation Plant,Huaibei Mining(Group) Co.,Ltd.,Huaibei 235000,China)

    There are lots of problems in dosing system in Wobei coal preparation plant,such as insufficient reagent supplement,unobvious reagent effect,unreasonable materials ratio and dosing points.To resolve those problems,install liquid level alarm devices and detection devices as well as recirculating barrel and tranquilizer,thicken pipelines,improve the infusion pump pipeline power,adopt new mixer and transmission model,utilize mine water as make-up water for preparation,optimize reagent ratio,dosing methods and points.After transformation,the dosing system is more automatic,reduce the labor intensity,improve the security coefficient and setting velocity of slime water,the reagent dissolve fully and their effect is more obvious,the mass fraction of flocculant becomes steadier.The plant saves reagent cost 5.94×105 yuan,payload 6.00×104 yuan each year.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 673K]

  • Dense medium consumption reduction measures in southern direct of Baode coal preparation plant

    SUN Chang-song,JIANG Han-yuan,ZHANG Ning(Baode Coal Preparation Plant,Preparation Center of Shendong Coal Group Co.,Ltd.,Xinzhou 036600,China)

    Based on the analysis of dense medium recycling process in southern direct of Baode coal preparation plant,transform the process systems through controlling the quality of dense medium and water for sculping screen,changing addition way of magnetic powder,improving the separation efficiency of magnetic separator,ensuring operation efficiency before separation,reducing management loss of medium.After transformation,the average mass fraction is improved from 88.25 percent in May to 92.80 percent in July,the particle size less than 0.074 mm is improved from 75.43 percent to 90.88 percent.The dense medium quality,recovery efficiency of magnetic separator,effective sieving area,penetrability of qualified suspension are improved,while the medium loss is decreased.Two-stage jetting modes get better recovery effect.The desliming efficiency before separation is improved.The results show that,the medium consumptions of lump coal separation system,fine coal separation system and gangue rewash system are 0.24,0.44,0.50 kg/t,respectively 0.16,0.56,0.30 kg/t less than perform index,monthly save dense medium 328 t,which cost 2.427×105 yuan.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 835K]

  • Preparation of spherical activated carbon from caking bituminous coal

    JIN Ying1,FENG Li-jun2 (1.College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China; 2.Siyuan Biological Technology Co.,Ltd.,Taian 271000,China)

    During the preparation of coal-based spherical activated carbon,the preoxidation condition of green pellet largely decide the sphericility and physicochemical characteristics of spherical active carbon(SAC).Taking the coking coal from Huajin Coking Coal Group in Liulin,Shanxi as raw material,research the influence of preoxidation,carbonization,activation and the like on the characteristics of activated carbon.The results show that under the condition of pretreatment temperature 200 ℃,processing time 3 hours,final carbonization temperature 700 ℃,carbonization heating rate 4 ℃/min,activation temperature 800 ℃,activation time 7 hours,the active carbon have orbicular sphericity and great physicochemical characteristics.The iodine value of active carbon is 770.18 mg/g and the iodine adsorption value is 64.24 mg/g.The intensity and yield of active carbon increase with the length of pretreatment time.The results provide reference for the production of coal-based spherical activated carbon.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 910K]

  • Influence of binder and reinforcing reagent on coal blending test

    SHANG Tie-cheng1,2,3(1.Beijing Research Institute of Coal Chemistry,China Coal Research Institute,Beijing 100013,China; 2.National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute),Beijing 100013,China; 3.State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources (China Coal Research Institute),Beijing 100013,China)

    Taking the coking coal applied in one coking plant in North China as object,analyse the properties of coal samples and additives,find their advantages and disadvantages,which provide the reference for the coal blending,then research the properties of blends and cokes.Based on the coal petrography and co-carbonization theories,replace parts of strong caking coal with tar pitch or petroleum pitch,or adopt coke powder and petroleum coke as leaning reagent.The analysis of additives function in blending coal show that,as one ideal adhesive,the most adaptive for pitch is 3 percent to 5 percent,for anthracite is 5 percent.Anthracite,coke powder and petroleum coke are common leaning reagents.In th aspect of improving coke abrasive strength,reducing volatiles,reducing ash and improving coke lumpiness,anthracite,coke powder and petroleum coke respectively is the best choice in turn.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 1055K]

  • Establishment of dry volatile-free basis and its application in semi-coke preparation from lignite

    AN Hong-guang1,ZHANG Yi1,LI Guo-sheng1,LIU Jun-feng2,ZHAO Ying1(1.Datang International Power Generation Co.,Ltd.,Beijing 100033,China; 2.Datang International Chemical Technology Research Institute Co.,Ltd.,Beijing 100070,China)

    Based on proximate analysis and coal quality analysis,provide a new reference index,dry volatile-free basis.The lignite for semi-coke preparation is divided into three grades according to the yield of dry ash-free basis.The lignite is considered as:the third grade when yield is 50 percent,the second grade when yield is 55 percent and the first grade when yield is 60 percent.According to these grades,semi-coke products are third grade,second grade and first grade separately.The results of analysis on different grades lignite and semi-coke analytical items demonstrate that when the dry ash free item(volatile + fixed carbon) is 50 percent,the lignite upper limit of moisture and ash should not exceed 50 percent,the sole item of moisture is no more than 40 percent and the ash is no more than 20 percent.When the dry ash-free basis(volatile + fixed carbon) is 55 percent,the yield of semi-coke preparation from lignite is between 40 percent and 45 percent.When the dry ash free item(volatile + fixed carbon) is 60 percent,the yield is between 41 percent and 43 percent.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 632K]

  • Influence of coal quality characteristics on the choice of boilers in coal-fired power plant

    ZHU Hai1,WANG Hai-tao2(1.Qinre Power Generation Co.,Ltd.,Qinhuangdao 066003,China; 2.Huaneng Clean Energy Research Institute,Beijing 100098,China)

    The analysis of coal quality characteristics which is going to apply in newly-built power plant indicates that the Mt of design coal and check coal are more than 31 percent,so caution should be used when choosing the type of pulverized coal furnace and medium speed grinding system.The design coal tends to slightly slag and moderate contaminate,while the check coal is inclined to serious slag and highly contaminate.Both are low volatile lignite,the calorific value are poor.Based on the coal quality,fuel moisture,slag characteristics,volatiles,calorific value and CaO content in coal ash,chose the type of boiler.The results show that,compared with pulverized coal furnace,CFB boiler has better coal applicability and stable combustion performance under low load condition,which avoid the slagging.The combination of CFB and dry desulfuration dedusting system makes full use of CaO in coal ash,reduces the additional CaO consumption.The CFB boiler has lots of advantages such as great coal applicability,broad load control range,long cycle of operation which are the right furnace for design coal and check coal.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 645K]

  • Research progress of coal tar deep processing

    XIONG Dao-ling,CHEN Yu-juan,OUYANG Jie-sheng,LI Ying,ZHONG Hong-ming,LI Jin-hui(School of Metallurgy and Chemical Engineering,Jiangxi University of Science & Technology,Ganzhou 341000,China)

    Summarize the composition,characteristics and research progress of coal tar.The most widely used coal tar chemical products such as naphthalene,phenolic compound,pyridinium could be prepared from the wash oil of coal tar.The products has high quality.The technological process is that,through vacuum distillation,first gather the fraction at different extraction temperature ranges,then dephenolize,distill,crystallize and extract.Study separation and purification methods of fluorene,benzpyrole and biphenyl.The preparation of fuel oil from coal tar by catalytic hydrogenation is the development direction of coal tar deep processing,which could reduce the pollution caused by coke oven gas combustion.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 728K]

  • Relationship between carboxy reactivity of coking coal and coke reactivity

    WANG Xiao-lei1,2,3,WANG Yan1,2,3,WANG Li-bin1,2,3,SHANG Tie-cheng1,2,3(1.Beijing Research Institute of Coal Chemistry,China Coal Research Institute,Beijing 100013,China; 2.National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute),Beijing 100013,China; 3.State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources (China Coal Research Institute),Beijing 100013,China

    Carboxy reactivity of coal and coke reactivity are the reduction reaction of carbon and CO2 at higher temperature,which are greatly influenced by coal property.To confirm their relationship,taking gas coal,fat coal,primary coking coal,1/3 coking coal and gasfat coal as experimental samples,test the carboxy reactivity of single coal and the corresponding coke reactivity,the latter is coked on 40 kg stamping coke oven.The results show that,the measurement of coke reactivity is more complex and requires high-reliable equipments than that of carboxy reactivity of single coal comparing from sample amount,reaction time and operation methods.So the former could be replaced by the latter while there isn't enough time and sample amount,then deduce the CRI with the experimental data.There is better correlativity between the carboxy reactivity of the selected coal and corresponding coke reactivity,and the correlation coefficient is 0.99.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 731K]

  • Status analysis and development of coal water mixture technology

    LIANG Xing1,2,3,YAN Li-li1,2,3,XU Yao1,2,3(1.Energy Saving Engineering and Technology Branch,China Coal Research Institute,Beijing 100013,China; 2.State Key Laboratory of Coal Mining and Environmental Protection(China Coal Research Institute),Beijing 100013,China; 3.National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute),Beijing 100013,China)

    Emphasize the service environment of coal water mixture(CWM) as well as its preparation methods and combustion state.To illustrate it's environmental and economical,taking one CWM plant in Dongguan whose productivity is 106 tons per year as sample,introduce its investment from construction preparation,system configuration,factory layout.Analyse the operating cost from material,labor,power consumption and maintenance.Compare the CWM boiler with 10 t/h oil-fired boiler and 10 t/h chain coal-fired boiler from calorific value,sulphur share,boiler rated output,material consumption,investment and operating cost.At last,give some suggestions for the relevant national standards establishment.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 723K]

  • Influencing factors of NO_x emissions in methane combustion furnace based on CFD

    SUN Qi,HU Yang-dong,WU Lian-ying(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China)

    Simulate the combustion process in methane combustion furnace using the computational fluid dynamics software FLUENT.With the establishment of mathematical model,investigate the temperature and NOx emission under different preheated air temperature,oxygen concentration in the air,excess air coefficient and nozzle diameter.On that basis,further study the furnace operating and structural parameters on combustion performance,thus providing guidance for combustion improvement and pollutant emissions reduction.The results show that,high temperature and low oxygen combustion,keeping the excess air coefficient from 1.0 to 1.3 and smaller nozzle diameter all are conducive to combustion process and make the combustion furnace temperature distribute uniformly,therefore reduce NOx emissions.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 982K]

  • Experimental research on desulfuration efficiency improvement of CFB boiler

    YANG Zhen-sen1,LIU Bin2,CHEN Ning-wu1,ZHANG Si-hai1,WANG Hai-tao2,WANG Peng-li2,GAO Hong-pei2(1.Ningxia Guohua Ningdong Power Generation Co.,Ltd.,Yinchuan 751400,China; 2.China Huaneng Clean Energy Research Institute,Beijing 100098,China)

    To improve the desulfuration efficiency of CFB boiler,investigate the desulfuration system of 330 MW CFB boiler in Ningxia Guohua Ningdong Power Generation Company.The main influencing factors are bed temperature,ratio of upper and lower secondary wind,bed pressure,particle size and CaCO3 quality.After transformation,with 20 percent to 40 percent less CaCO3 consumption,the desulfuration efficiency reaches up to 96 percent,the SO2 emission concentration could be controlled below 100 mg/m3,meeting the newest national environmental protection standards.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 831K]

  • Combustion numerical simulation of rarefied gas in high temperature sintering ore

    ZHANG Wen-wen,ZHANG Zhong-xiao,BI De-gui(School of Energy and Power Engineering,University of Shanhai for Science and Technology,Shanghai 200093,China)

    With the help of software FLUENT,numerically simulate the combustion of hydrocarbon,H2,CO,which are exhaust gas gathering from different points of sintering machine.The simulation is operated on ring cold machine and the high temperature clinker burn out at last.Taking 6 kinds of combination of CH4,CO,H2 as samples,investigate the proper sinter thickness which support the mixture gas completely burn out at 600,500,400 ℃.Research the combustion law under different temperature,mole fraction of each gas and sinter thickness.The research could provide reference for waste heat recovery and exhaust gas reduction during sintering process.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 853K]

  • Safety analysis and hidden trouble prevention of open-type pulverized coal preparation system

    ZHANG Bi-hui (Shenhua Shendong Coal Group Co.,Ltd.,Shenmu 719315,China)

    To prevent spontaneous combustion and explosion during preparation and storage of pulverized coal,the preparation of pulverized coal and coal quality detection should be paid more attention.Summarize the common pulverized coal preparation technology,point out that the low metamorphic bituminous coal is the common fuel for industrial boiler,and the higher volatile,the lower smoldering temperature.The explosion of pulverized coal is largely influenced by its concentration,oxygen content,ignition source,volatile and particle size.Introduce the specific hidden trouble prevention measures from the aspect of drying system,pulverized coal storage system,processing set-up and maintenance.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 790K]

  • Mineral composition and crystal structure of fly ash in Huainan power plant

    ZHOU Jia,SHAO Qun,MA Xiao-cheng,GE Wu-jie,LI Sen(School of Chemical Engineering,Anhui University of Science and Technology,Huainan 232001,China)

    To improve the added value of products prepared from fly ash,increase utilization methods,taking the fly ash in Huainan power plant as sample,treat the raw material by roasting,acid and alkali.Then analyse the original samples and treated samples using chemical analysis and X-ray diffraction(XRD),study the main elements,mineral composition and crystal structure of fly ash,which provide reference for the comprehensive utilization of fly ash.The results show that,alkali treatment destroy the vitreous body structure of fly ash and release the active SiO2 and Al2O3.It helps to take off the impurity,release active ingredient advantage,increase the added value of fly ash.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 1059K]

  • Research and application of denitration technology in mid and mini type industrial boiler

    GUO Zhi-xin1,2,3,XUAN Wei-bo4,LAI Mu-gui4(1.Energy Saving Engineering and Technology Branch,China Coal Research Institute,Beijing 100013,China; 2.State Key Laboratory of Coal Mining and Environmental Protection(China Coal Research Institute),Beijing 100013,China; 3.National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute),Beijing 100013,China; 4.Research Institute of Coal Water Mixture Technology,Dongguan 523061,China)

    Study the effect of excess air coefficient,de-oxidation additive amount on NOx emission with the help of coal water mixture organic heat transfer material heater whose type is YJW5900-J and the flue gas analyzer(testo-350XL-Germany).The results show that,without additional reductive reagent,the selectivity un-catalytic reaction of coal water mixture goes well,the NOx emission can be controlled by adjusting the excess air coefficient.This method guarantees that the NOx emission meet the national discharge standards.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 967K]

  • Experimental study on high temperature oxidation of extremely low concentrations methane

    CUI Jing-kun1,2,ZHANG Xin-lei1,2,CHEN Shan-chang1,2,LI Meng1,2,LIU Rui-feng1,2,SHI Chun-yu1,2(1.College of Resources,Hebei University of Engineering,Handan 056038,China; 2.Hebei Technology Research Center of Coal Mine Construction Engineering,Handan 056038,China)

    Simulate the coal mine ventilation air methane(VAM) with extremely low concentration methane,0.75 percent and 0.5 percent.Then put these two kinds of methane through high temperature furnace,collect and test the exhaust air in order to get the conditions and rules of VAM high temperature oxidation.Study the oxidation condition of VAM by adjusting furnace temperature and methane velocity,get the relationship between oxidation condition and its reaction time,methane concentration.The results show that,the higher the methane concentration,the lower the needed oxidation temperature.The shorter the reaction time,the higher the desired oxidation temperature.The VAM in furnace begins to oxide at 850 ℃,completely consume at around 900 ℃.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 950K]

  • Coal gasification experiments using solar

    GUO Hong-jun1,WANG Zuo-tang2,WANG Chang1,ZHANG Chao1, CUI Man-tang1,LIU Yong-zhen1,ZHANG Qian-long1(1.The Honors College of Sunyueqi,China University of Mining and Technology,Xuzhou 221116,China; 2.School of Mines,China University of Mining and Technology,Xuzhou 221116,China)

    Based on the current coal gasification theory,state the concept of coal gasification powered by solar.That means,gather the low-energy sun light into light beam with high energy flowing density,directly radiate coal powder without oxygen,then the high-temperature pulverized coal react with steam.Design and conduct this experiment for many times,measure the component ratio of hydrogen,carbon monoxide and carbon dioxide in mixture gas.The results show that,when the temperature is below 700 ℃,the H2 in mixture gas reaches up to 70 percent and little CO is generated,at that time the convertion between H2 and CO is obvious.Raising temperature,the conversion rate of hydrogen reduce,and the mutual transformation of CO and CO2 is significant.The yield of effective gas(H2 and CO) is maximum when the temperature ranging from 1000 ℃ to 1050 ℃,and the coal conversion utilization is approximately 99 percent.The composition of mixture gas fluctuate again with the rise of temperature,the reaction trends to be unstable,even appears mutant abnormal phenomena.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 955K]

  • Energy saving and emission reduction measures in Chahasu coal preparation plant

    ZHENG Gao-chao1,WANG Ju-long1,ZHANG Qing2(1.Schenck Process(Tianjin) Industrial Technology Co.,Ltd.,Beijing 100010,China; 2.Chahasu Coal Preparation Plant,Guodian Jiantou Inner Mongolia Energy Co.,Ltd.,Erdos 017209,China)

    To reduce energy consumption and damage to environment in the running of Chahasu coal preparation plant,provide some measures from the aspect of pollution prevention and water conservation.The pollution involves waste water,exhaust gas,gangue and sound pollution.The main solutions are adopting closed water circuit,spraying coal stocking yard,comprehensively utilizing gangue,erecting high frequency equipments in the bottom of plant during the early construction,covering wear-resisting rubber sheet and acoustical board for line pan or other equipments.Introduce energy saving from processing set-up,electrical appliances designing and new materials usage perspective.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 738K]

  • Carbonaceous sorbent for mercury removal in coal-fired flue gas of power plants

    WU Peng1,2,MIAO Wen-hua1,2,JIANG Jun-qing1,2,ZHANG Xu-hui1,2,WANG Juan1,2(1.Stated Grid Electric Power Research Institute,Nanjing 210003,China; 2.Beijing Guodian Futong Science and Technology Development Co.,Ltd.,Beijing 100071,China)

    The flue gas of coal-fired power plants is one of the major sources of mercury emissions.Provide an overview of current power plant flue gas mercury pollution and major mercury removal methods,introduce the coal-based adsorbent used in mercury pollution control.The adsorption activity of coal-based adsorbent is related to a variety of factors.Summarize the effects of SO2,CO2,CO,HCl and others in flue gas on mercury removal performance of activated carbon,discuss the activated carbon adsorption efficiency on different adsorption temperature and carbon-mercury ratio,analyse the effects of different modification methods on mercury removal efficiency and the impact mechanism.As the high cost of activated carbon application,introduce the mercury removal properties of fly ash,then summarize the effects of adsorption temperature and inlet mercury content on fly ash adsorption efficiency.The lignite active coke has the advantages of low cost,abundant surface area and pore structure,high chemical activity and great adsorption properties,is a promising mercury removal adsorbent for power plant flue gas.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 834K]

  • Transformation of nebulizer in pulp preprocessor in Tunlan coal preparation plant

    ZHAO Xiao-hong(Tunlan Coal Preparation Plant,Xishan Coal Electricity Group Co.,Ltd.,Gujiao 030206,China)

    Higher failure rate and lower reagent dosing efficiency of original nebulizer in Tunlan coal preparation plant posed difficulty for maintenance and operation.While abandoned the nebulizer,the reagent consumption increased,the flotation effect became poorer.Transform the composition,pipeline location of nebulizer.After transformation,decrease the failure rate and fittings wear,effectively atomize the reagent,minimize the maintenance times.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 829K]

  • Surface drilling exploring three zones for surface subsidence monitoring

    QIAO Guo-hou(Yima Coal Industry Group Co.,Ltd.,Yima 472300,China)

    Due to the decrease of coal resources,more and more urban land turn to subsidence area,so its reclamation is the most pressing thing.Taking one main underground mine as subject,analyse the matters needing attention from the aspect of well location,drilling equipments,drilling methods and technology,detection of slurry component and parameter,leaking stoppage measurements for wall protection.Based on the analysis of drilling purpose,methods and location,analyse the pavement construction of No.1 and No.2 drillhole.The surface subsidence could be monitored by drilling exploring three zones.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 795K]

  • Cause of filter bag failure and preventive measures

    XU Yao1,2,3,ZHANG Xin1,2,3,LIANG Xing1,2,3,WANG Nai-ji1,2,3(1.Energy Saving Engineering and Technology Branch,China Coal Research Institute,Beijing 100013,China; 2.State Key Laboratory of Coal Mining and Environmental Protection(China Coal Research Institute),Beijing 100013,China; 3.National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control(China Coal Research Institute),Beijing 100013,China)

    To resolve ageing and losing efficacy problems of PPS filter bag on boiler tail after one heating season in Cuncaota No.2 Coal Mine,Shendong Group,made routine performance test,infrared spectrum analysis,DTA and electron microscope scanning for damaged filter bag.The results show that oxidation is the main reason.Considering the technological process and equipments maintenances,provides a series of measures to lengthen the service life of filter bag,which are increasing the boiler load to rated load,decreasing oxygen content of smoke gas,bepowdering the internal surface of filter bag before operation,controlling the exhaust gas temperature and the like.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 1052K]

  • Coal seam correlation methods of Yanan Formation in Jijiajing mining area

    GOU Ming-fu(Sichuan Geophysical Exploration Company,CNPC Chuanqing Oilfield Service Co.,Ltd.,Chengdu 610213,China)

    Yanan Formation of middle Jurassic in Jijiajing mining area contains more than 20 coal seams.This study numbers 23 coal seams,among which 9 coal seams are mining coal seams or local mining coal seams.Yanan Formation can be divided into 5 sections from bottom to top,in which the second section has the most thickness of more than 7 m.The sedimentary environment of Yanan Formatin belongs to shallow water lake delta,which is characterized by changeable phases and unstable marker bed.These situations would multiply the difficulties in the coal seam correlation,then affect the overall development plan of Jijiajing mining area.According to the properties of cycle and sedimentary rhythm,interlayer spacing between coal seams,own characters of coal seams,coal petrographic characteristics,geophysical characteristics,and seismic physical properties characteristics,this study took a synthetical contrast of coal seams,with high reliability.Especially in longitudinal and horizontal tracing contrast of mining coal seams,these methods have ample foundation and reliable results.

    2012 06 v.18;No.82 [Abstract][OnlineView][Download 859K]
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