2017年05期目次

  • Sodium removal from Wucaiwan coal by microwave treatment

    HUANG Xiaohe;ZHANG Shouyu;JIANG Fenghao;School of Energy and Power Engineering,University of Shanghai for Science and Technology;

    In order to study the effect of microwave treatment on the sodium removal from the Wucaiwan coal,Wucaiwan coal was waterwashed in laboratory microwave oven and high-pressure reactor,and the coal sample prepared by water-washing in high-pressure reactor was dried by microwave drying and traditional air drying method,respectively.The sodium content of the raw and treated coal samples was determined by an inductively coupled plasma atomic emission spectroscopy.The results indicate that the sodium contained in Wucaiwan coal is mainly in the forms of water-soluble sodium.With the increase of temperature,the efficiency of sodium removal from the coal using microwave water-washing followed by traditional air drying increased and reached 51.6% at 200 ℃.Compared with the electric heating water washing method,the microwave treatment has the higher efficiency of sodium removal.The sodium content of the electric heating waterwashed coal sample can be further decreased by the subsequent microwave drying.The best microwave drying time (at 200 ℃) for the sodium removal from the coal treated by the electric washing is 10 min.Compared with the hot air drying,a higher efficiency of sodium removal was obtained by the microwave drying after the electric heating water washing (200 ℃) in a short time.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1358K]

  • Present situation analysis and prospect of low rank coal quality-based utilization conversion route

    PAN Shengjie;CHEN Jianyu;FAN Fei;LI Pengfei;Lanzhou LS Energy Equipment Engineering Institute Co.,Ltd.;Lanzhou Lanshi Group Co.,Ltd.;

    In order to know systematically the products' application status and the trends of technology developmentoflow rank coal quality-based utilization in China,introduces the process route and conversion path of low rank coal quality-based utilization briefly,and expounds the three main products (coal tar,pyrolysis gas,carbocoal) produced by pyrolysis and their industrial application status.Emphatically sumed up how to use coal tar,pyrolysis gas and carbocoal,and analysed the key technology problems of low rank coal quality-based utilization at present,put forward the research directions in future,also on the development prospects were looking forward.Through the analysis,that according to the distribution of coal resources in China,reserves and characteristics of low rank coal,as well as the guidance of the national to the coal energy policy,in conditions of solving the common key problems,low rank coal quality-based utilization should be taken as the upstream process,at the same time,downstream of coal-electricity-chemical industry integration project,this park project group mode forthe clean coal quality-based utilization will be the best way to achieve mutual benefit and win-win use of low rankcoal.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1317K]

  • Solid acid for hydroliquefaction of a lignite from Xinjiang

    ZHAO Peng;Coal Chemistry of China Coal Research Institute;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control;

    To achieve the lignite mild liquefaction to high-added value phenols,a new solid acid catalyst was developed to ensure the low cracking under mild condition.Physical property characterization and activity evaluation of the catalyst were conducted.The influences of catalyst type on the reaction and product distribution under the mild condition were studied.The feasibility research on solid acid catalyst used in mild direct coal liquefaction was discussed.The results show that strong acid site forms with the particle diameter of solid acid decreasing.Under the conditions of 430 ℃ and 15 MPa,coal conversion ratio and oil yield are similar to that of traditional process.Phenols yield increases by 1.5% and gas yield decreases by 4%.The solid acid catalyst is beneficial for energy conservation,emissions reduction,efficiency increase and products optimization.The solid acid catalyst used for direct coal liquefaction should be focused,and further study is needed because of its good coal conversion activity and selectivity.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1554K]

  • Influence of air amount on index gas for lignite combustion

    ZHOU Xihua;WANG CHENG;LI Ang;BAI Gang;GUO Xiaoyang;College of Safety Science and Engineering,Liaoning Technical University;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education;

    Brown coal of Pingzhuang at Ruian was taken as the sample,the temperature range of the coal during combustion stage was determined by thermo gravimetric test,and the spontaneous combustion experiment was carried out by using tube furnace heating system.Gases were obtained at 40,80,120,160 and 200 m L/min of air volume respectively.In order to determine the correlation degree of the optimal index gas,the gray correlation method was used to analyze the gas.The results show that the temperature of the lignite combustion stage is247-433 ℃,and the rapid combustion state is achieved at about 408 ℃.When the air volume is constant,the correlation degree of temperature of CO_2/ΔO_2,CO/ΔO_2 and C_2H_4 is higher than that of CO,C_2H_6 and C_2H_4/C_2H_6.With the increase of air volume,the correlation between gas and temperature is: CO_2/ΔO_2 is the largest,followed by CO/ΔO_2,C_2H_4 and CO,C_2H_6 and C_2H_4/C_2H_6 are the smallest.So CO/ΔO_2,CO/ΔO_2 and C_2H_4 can be used as the main quota,CO is used to predict the coal mine closed fire zone combustion status.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1487K]

  • Reaction kinetics of Shengli brown coal liquefaction at initial stage

    SHENG Ming;WANG Yong;Coal Chemistry Branch of China Coal Research Institute;State Key Laboratory of Coal Mining and Clean Utilization;State Key Laboratory of Coal Mining and Environmental Protection;

    To investigate the reaction kinetics of Shengli brown coal liquefaction at initial stage,experiments were carried out using a micro-autoclave with a very rapidly heating and cooling system.The study of reaction kinetics liquefaction of at initial stage were investigated according to the parameters.Although the heating time is short,partial coal is already converted when the autoclave reaches the reaction temperature.The conversion ratio is 28.12% at 440 ℃ with a residence time of 0.At lower temperature,Shengli brown coal is solely pyrolyzed,and there is less conversion at initial stage.The conversion is 28% with a 10 min holding time at 380 ℃ and it is almost constant.With the temperature increasing,the conversion ratio,oil and water yield,and gas yield rise,and the increasing rate is higher at initial 10 min,and the trend postpones at late 10-25 min,because the asphaltenes as intermediates are hardly converted to oil fraction.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1477K]

  • Influencing factors of low temperature pyrolysis of powder shale from Yaojie of Gansu province

    LIU Dahai;SHI Changjiang;LIU Pan;WANG Xingkun;YANG Shengzhi;Nari Group Corporation/State Grid Electric Power Research Institute;Beijing Guodian Futong Science and Technology Development Co.,Ltd.;

    In order to improve the efficiency of low temperature shale pyrolysis,powder shale from Yaojie of Gansu province was chosen as the research object.Using the tube type heating furnace investigated the influence of productive rate of oil solution on different pyrolysis temperature,temperature holding time,and heat carrier gas flow.The experimental results show that the increasing of pyrolysis temperature give rise to the productive rate of oil first increased and then decreased,the fastest pyrolysis rate reached 7.95% at 540 ℃.Increasing the temperature of the thermostatic time,the oil production rate is improved.Keeping temperature more than 30 min,the pyrolysis oil production rate increase is not obvious.Increasing the gas flow is conducive to carrying of shale oil.When the gas flow rate gets more than 300 mL/min of pyrolysis,oil production rate tends to be stable.At the optimum experimental conditions of raw materials,oil production rate,water production rate and gas production rate are more than the result of carbonization test in aluminium retort.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1386K]

  • Practical research of Dananhu high sodium coal combustion in Hami mining

    CHENG Youliang;SHI Hongbo;ZHANG Ning;SHI Yajun;MOE's Key Laboratory of Condition Monitoring and Control for Power Plant Equipment,North China Electric Power University;

    In order to optimize the boiler operation coditionusing high sodium coal and improve the safety and economy of boiler,as well as reduce the slagging formation,a 660 MW supercritical unit was used to test the the adaptability of boiler to high sodium coal,and the design features and operation characteristics of 600 MW class tower type boiler that the first time to use high sodium coal was analyzed.The experiment was carried out to study the influence of separator baffle,the ratio of air to coal,the SOFA (separated over-fire air),excess air coefficient,surrounding air,air distribution mode,deviated air,variable style of blending to related parameters and slagging studied.The optimal value was determined by considering the boiler efficiency,slagging,NO_x and other factors.Accordingly,experiments with a high proportion of blending (75%) Dananhu high sodium were conducted to show that there was less severe slagging.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 3096K]

  • Effect of bituminous coal blending on MB fan mill for 600 MW lignite unit

    LIU Jiali;ZHANG Sen;JIA Xiaoyan;TU Jingyi;WANG Zhichao;Xi'an Thermal Power Research Institute Co.,Ltd.;Xi'an Yitong Thermal Technology Services Co.,Ltd.;

    In order to comprehensively analyze the influence of lignite boiler with blending bituminous coal on the promotion pressure,grinding force,drying output and operation parameters of the MB fan mill,the semi-industrial test on a SO_2 fan mill and the thermal equilibrium computation for three medium fan mill MB3600/1000/4900 were carried out,and the combustion characteristic of mixed coal was tested on one-dimensional flame furnace and coal-air flow ignition temperature test furnace.The results show that through blending low calorific value lignite with a suitable proportion of high-quality bituminous coal,the load carrying capacity can be improved,and the drying capacity and promotion pressure also can fulfill the operation requirement.It is important to note that blending of bituminous coal will reduce the life of striking plate due to the stronger wear resistance of bituminous coal.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1391K]

  • Integration of pyrolysis and gasification of low rank pulverized coal

    LONG Dongsheng;CCTEG Shenyang Engineering Co.,Ltd.;

    In order to achieve the objectives of research and development of clean and efficient lowrank coal pyrolysis technology,overcoming the key technologies such as pulverized coal pyrolysis and development of pyrolysis-gasification integration technology pointed out in13 th Five-Year Plan for Coal Deep Processing Industry Demonstration.By expounding the principle for coal pyrolysis and gasification reaction,and the current reality of widespread pyrolysis and gasification separate generation,the integrated technical route was put forward to take quality-divided products,materials reciprocation,heat cycle,modular combination and tower structure as the concept,conceives a lowrank pulverized coal pyrolysis-gasification integration device with double tower structure.Theoretical basis,technological process,component structure and main and auxiliary tower combination scheme of the conception were introduced.The conception device can produce pyrolysis water vapor,low temperature pyrolysis gas,gasification gas,semi-coke and other products on the divided-quality basis from lowrank pulverized coal,and provide conditions for coal cascade extension processing.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1556K]

  • Coal quality characteristics of coal seam in Laogongyingzi mine field

    HE Bao;LI Zhennan;ZHANG Ying;DONG Yang;College of Mining Engineering,Liaoning Technical University;Jinzhou Jinheng Real Estate Consulting and Surveying and Mapping Limited Company;Liaoning Survey Academy of Geology and Mineral Resources;

    In order to make economical utilization of the coal in Laogongyingzi mine field,this paper studied the coal quality characteristics based on the geologic profile,the sedimentary cycle of coal-bearing strata and the physical and chemical properties of coal.And the relationship between the chemical composition of coal and the depth of coal seam was analyzed to determine the industrial properties and the use of coal.The results show that the lithotypes of the coal is dominated by clarain and durain; and the coal maceral is mainly composed of vitrinite.The content of chemical components in coal seam is more obvious than that in coal seam with depth of 200-350 m,and it is more stable with the increase of burial depth.The average internal moisture content of raw coal is approximately 6.09%-10.28%,the average ash content is ca.16.93%-25.80%; and the average sulphur content is ca.0.78%-1.47%,as well the average volatile content is more than37%; while,the contents of other elements are low.Obviously,the coal is with medium ash and sulphur contents.According to quality evaluation method,i.e.,the region's average gross calorific value,constant humidity gross calorific value,transmittancy etc.,the coal belongs to a medium-low calorific value of No.2 lignite.Because of its medium-low calorific value,poor thermal stability,high chemical reactivity with CO_2 and medium tar yield,the coal can be used as a raw material for steam coal,gasification coal and coking coal; and thus it can have a greater economic value.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1397K]

  • Research in coal-based activated carbon for supercapacitor

    HOU Caixia;KONG Bihua;FAN Lihua;GUO Binglin;XU Lijun;College of Chemical Engineering,North China University of Science and Technology;Coal Chemical Engineering Research Center of Hebei Province;

    In order to study the influence of coal-based activated carbon electrode on the performance of supercapacitor.According to the working principle of the supercapacitor,the influences of specific surface area,pore size distribution,surface functional groups,degree of graphitization,ash content and granularity of activated carbon on the electrochemical performance were systematically investigated.It shows that proper proportion of mesopore and proper granularity are in favour of the diffusion of the electrolyte ions; Oxygen-containing functional groups and nitrogen-containing functional groups can improve the wettability of electrode materials; the pore structure of amorphous carbon is well-developed,as activated carbon materialsuitable; reducing the ash content can improve the charge and discharge characteristic and the rate performance.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1474K]

  • Heating characteristics of carbon-based materials under microwave irradiation

    JIANG Xiaowei;WANG Huigang;LI Longzhi;YAN Yukun;College of Mechanical and Electronic Engineering,Shandong University of Science and Technology;

    To study the effect of microwave power,particle size and carrier gas flow rate on temperature-rising behavior of activated carbon,the heating experiments of activated carbon are conducted using microwave heater.The results reveal that the heating rate of wooden activated carbon and coal-based activated carbon increases with the increase of microwave power.The highest temperature is also improved as microwave power rise.When the power increases from 240 W to 400 W,the average temperature obtained by wooden activated carbon has a rise up to 93 ℃ at the period of 10-16 min.Such difference in wooden activated carbon is significantly greater than that in coal-based activated carbon.Increasing particle size of wooden activated carbon results in a decrease in the heating rate and final temperature.Further,heating rate and the maximum temperature are slowed down with increasing the carrier gas flow rate.The favorable conditions for temperature-rising of activated carbon with microwave heating are microwave power of 400 W,activated carbon particle size of ≤1 mm and carrier gas flow rate of 60 L/h.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1840K]

  • Combustion characteristics research of Funshun oil shale semi-coke

    LI Yanchang;WU Xiaoyu;HAN Guang;College of Safety Science and Engneering,Liaoning Technical University;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education;

    In order to improve the efficiency of the oil shale semi-coke combustion characteristics to the Fushun oil shale refining process,which main source of heat is the semi-coke' soxidation,three Fushun oil shale semi-coke's surface morphology and combustion characteristics with different coke making temperature 450 ℃,550 ℃ and 650 ℃ are reasearched by SEM and TG.The results show that the semi-coke surface becomes rough and serious feathering duing to volatile releasing.TGA data shows that the semi-coke's ignition temperature rise with the high semi-coke's coke making temperature,the ignition temperature increased to 408.76 ℃ of J3 semi-coke from 384.7 ℃ of J1 semi-coke at 20 ℃/min what mainly duing to releaing more combustible material in coke making process at high temperature.Char activation energy is relatively small in a low conversion rate,the activation energy rises at high conversion rates duing to the reduction of combustible and the obstruction of the ash.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 234K]

  • TG-MS analysis of co-combustion of coal sludge and corncobs

    WU Junzhi;YANG Fengling;CHENG Fangqin;Institute of Resources and Environment Engineering,Shanxi University;State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources;

    To investigate the co-combustion characteristics of coal sludge and corncobs,the combustion behavior,such as ignition temperature and burnout temperature of coal sludge,corncobs and their blend were studied; and emission characteristics of CO_2,SO_2 and NO_2 were analyzed by simultaneous TG-MS technique.The results show that with a heating rate of 10 ℃/min the ignition and burnout temperature of the mixture of coal sludge and corncobs can be lowered by 204.62 ℃ and 26.52 ℃,respectively.With the increase of heating rate,the burnout temperature and the maximum weight loss of mixtures can be enhanced,but the ignition temperature appears to be approximately stable in different stages.The emission curves of CO_2 and NO_2 along combustion is resembled with the DTG curves.SO_2 emission from the co-combustion of coal sludge and corncobs is lower than those from coal sludge combustion.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1628K]

  • Study on the adaptability of small-grain oil shale and semi-coke CFB boiler combustion

    ZHANG Shixin;WENG Junjie;CHEN Xincan;LIU Haifeng;Huaneng Clean Energy Research Institute;Ningbo Mingzhou Thermoelectric Co.,Ltd.;China Western Power Industrial Co.,Ltd.;

    Oil shale pyrolyzed at low temperature can get shale oil.Due to the limitation of producing process,oil shale with diameter below12 mm can not be used in the distillation furnace,and a large number of by-products (shale semi-coke) are produced.This study was carried out to improve the utilization of by-products and maximize the use of resources.The physical and chemical properties,ignition characteristics,burnout features and coking performances of small particle shale and shale semi-coke were studied on a 1 MW_(th)CFB combustion test device.The experimental results show that the designed fuels from small particles and semi-coke in oil shale can guarantee stable combustion in CFB,When the combustion temperature is in the range of 720 to 850 ℃.CFB boiler is suitable for oil shale small particles and semi-coke blending burning.This way has the characteristics of high combustion efficiency and good combustion stability.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 180K]

  • Experimental investigation of pollutants emission characteristics from circulating fluidized bed boilers

    FANG Zhaojun;ZHOU Jian;BAI Xiaolong;MA Xianbo;WANG Jianyang;ZHANG Geng;GUO Lei;Xi'an Thermal Power Research Institute Co.,Ltd.,Suzhou Branch;Huaneng Fuzhou Power Plant;Huaneng Huaiyin Power Plant;

    In order to provide basic data for further emission reduction and technical supervision,different pollutants emissions are actually measured according the test codes under the condition of 100% BMCR load of two circulating fluidized bed boilers recorded as U1 and U2 with evaporation capacities of 240 t/h and 450 t/h respectively.The pollutants emission characteristics,coordinated removal efficiencies and environmental benefit were obtained from monitoring results that provided the basic data support for the enterprise sewage declaration,technical supervision and further emission reduction.The measurement results show that circulating fluidized bed boilers have the characteristics of high efficiency and clean performance,because common pollutants and others are effectively reduced through the pollution control equipment and coordinated control system.The average concentrations of dust,SO_2,NO_x,Hg,NH_3 and SO_3 are 13.1,16.0,71.4,5.6 ×10(-3),1.7,1.6 mg/m~3 of U1 boiler,and 4.8,10.4,95.7,69.4,4.9×10(-3),0.4,0.6 mg/m~3 of U2 boiler,respectively.The emission of SO_2 are 0.085 8 and 0.040 1 g/k Wh; while the emission of NO_x are 0.370 1 and 0.354 4 g/k Wh respectively.Consequently,only dust and NOx is needed be further removal to meet the ultra-low pollutants emission.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1743K]

  • Experimental research on NOx removal by using a commercial honeycomb type SCR catalysts

    CHEN Chongming;YU Jinxing;CHEN Ersong;LI Zhenhai;State Grid Hebei Electric Power Research Institute;Hebei Electric Power Commissioning Institute;

    To evaluate the removing effect of different forms of NO_x by SCR (selective catalytic reduction) technology widely used in coal-fired power plants,this study takes the commercial honeycomb type SCR catalysts as an example to investigate the influence of oxygen concentration,temperature,space velocity and mole ratio of NH_3/NO on NO,NO_2 and N_2O removing process in a SCR denitration test rig.The results showed that oxygen could improve the oxidation of NO and catalytic reducing reaction between NO and NH_3.High temperature could promote the removal of NO and oxidation of NH_3 to N_2O.And increasing space velocity,the NO removal would trend from rise to decline; as well,high mole ratio of NH_3/NO could accelerate the NO removal and NH_3 releasing.However,the removal of NO_2,N_2O is hard to achieve completely react with NH_3.Thus,for ultra-low NO_x emission,the coal combustion parameters should be optimized properly to avoid the formation of N2 O.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 187K]

  • Research status and prospect of wastewater treatment from coal to methane process

    GU Qiang;Yili Xintian Coal Chemical Co.,Ltd.;

    In order to realize the zero discharge of wastewater from coal to methane project,the primary wastewater treatment processes,such as phenol ammonia recovery,organic wastewater treatment,salt containing wastewater treatment,concentrated brine treatment,high concentration brine treatment,crystal salt treatment,and their characteristics were systematically summarized and analyzed.Finally,the development trend of zero discharge treatment technology was overviewed.In the future,the producing system and water supply system should be combined to optimize the process and to develop new approach for wastewater treatment and utilization.Such process can reduce wastewater and improve the recovery efficiency and stability of phenol ammonia recovery process,and even cut down operating costs.The anti-virus biochemical technology,high-performance anti-pollution film materials,high recovery rate and high purity salt crystallization process should be developed.The standard for coal chemical wastewater crystallization salt product should be formulated.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1427K]

  • Analysis and diagnosis of SCR denitrification system in 330 MW lean coal-fired boiler

    WANG Minwu;MENG Wenyu;REN Jie;ZHANG Kai;YANG Fengling;CHENG Fangqin;Changzhi Thermal Power Company;Shanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes,Shanxi University;North China Electric Power University;

    To solve the low efficiency and the short life of the catalyst in the SCR denitrification system of a 330 MW coal-fired thermal power plant,field test and analysis were conducted.The flue gas concentration,temperature field and velocity field were measured using flue gas analyzer,temperature test equipment,and flow test instrument etc.The results show that the flow field and temperature field were inhomogeneously distributing during operation.This is thought be the main factor for the low denitrification efficiency and the catalyst abrasion.On the basis of measurement results,the critical issues in the operation process were systematically investigated and confirmed.It provides suggestions for the optimization and operation of the thermal power plant,and offers available reference for the engineering practice and stable operation.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 5761K]

  • Review of water recovering technologies from flue gas in coal fired power plant

    TIAN Luning;HAN Zhe'nan;DONG Yong;LYU YANG;LI Yuzhong;CHEN Xi;LIU Wei;Wu Han Optics Valley Environmental Protection Technology Co.,Ltd.;National Engineering Laboratory for Coal-fired Pollutants Emission Reduction (Shandong University);

    In order to reduce the water content in scrubbed gas after FGD discharged from coal-fired power plant,to recover water and waste heat from saturated flue gas,as well as to eliminate the problems of corrosion,stack liquid discharge and plume downwash caused by vapor condensation,this paper analyzed the thermal characteristic and energy distribution in wet flue gas,and made a brief introduction and comparison of three approaches on water recovering from wet flue gas.Such methods,including condensation,liquid desiccant-based dehumidification (LDD) and membrane were feasible for the wet flue gas dehumidification,and their technical features,research status,shortcomings and research progress were reviewed.It is found that the vapor concentration in wet flue is about 80 g,more than 70% of waste heat is in the form of latent heat.Condensation method is a relatively matured technology at the present stage,while LDD method has a higher water recovery capacity and the process of membrane method is relatively simple.These technologies have a promising application prospect and represent the research trend of flue gas dehumidification.The economic way of low grade heat utilization will be one of the important research directions of flue gas dehumidification.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 203K]

  • Characteristic research of a new type of secondary-air-box on a W-flame boiler with slit type burner

    ZHANG Feng;LI Wen;JIA Bo;SONG Libin;WANG YAN;YAN Junshan;LEI Tengfei;XU Hongbin;Xi'an Thermal Power Research Institute Co.,Ltd.;China Building Material Test & Certification Group Xi'an Co.,Ltd.;Shang'an Power Plant,Huaneng Power International Inc.;

    In order to solve the problem of air lack in the middle of the furnace which was caused by the wide width of the furnace and the large sectional dimension of the air-box in the original design of a W-flame boiler with slit type burner,a new separated type of secondary-air-box was modified from the original design of boiler No.4 in Huaneng Shang'an Power Plant.Characteristic test after the modification of the new type of secondary-air-box showed that the air speed deviation between the upper and lower arches and the air duct regions was smaller than conventional cold ventilation.When one side of the forced draft fans was run and the communicating door was closed,air speed at the stopped side was obviously lower than the side that forced draft fan was operated.The deviation of the air velocity near the nozzle could be effectively reduced through the adjustment of the secondary air doors on the upper and lower arches.In the case of opening the communicating door of single forced draft fan,the deviation of the mean air speed between the three duct regions was not far different from the operation of the double forced draft fans.On the contrary,the furnace outlet oxygen showed a trend of middle height and low both ends; and the oxygen distribution in the furnace outlet tended to be balance after adjusting the opening of the secondary-air-box door indicating the secondary-air-box door can effectively regulate the air distribution of the secondary air in the furnace and change the oxygen distribution in the outlet of the furnace.It has been showed that the appropriate adjustment of the secondary-air-box door opening can effectively reduce the SCR inlet NOxconcentration and ensure the economic and environmental operation of the boiler.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1638K]

  • Performance of Fe3Al metal filter and its application in U-gas coal gasification plant

    LIU Xiansheng;GU Hu;PING Shaobo;LIU Haijian;WANG Hao;YANG Junjun;LIU Guanying;Yima Coal Comprehensive New Energy Co.,Ltd.;Advanced Technology and Materials Co.,Ltd.,China Iron and Steel Research Institute Group Co.,Ltd.;

    In order to resolve the fracturing issue of the traditional ceramic filter in fly ash filter of pulverized coal U-gas gasification process,the performance of the ceramic filter and metal filter was investigated.The improved domestic 2050 type Fe_3Al sintered metal filter were firstly installed in fly ash filter in U-gas system; and it was taken as a research object on the commissioning test.The properties of syngas and fly ash,microstructure of filter,filtration efficiency,flow rate,differential pressure curve and filter cake permeability were studied.The results show that the Fe_3Al filter with the same filtration precision as the ceramic filter has high porosity,permeability,and crushing strength.And it gains a 3 months continuous operation performance under similar condition.The running balance differential pressure of Fe_3Al filter decreases by 50% compared with traditional ceramic filter; meanwhile the content of suspended solids in washing tower significantly decreases from 1 000-2 000 mg/L to 100-500 mg/L.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 315K]

  • Resistivity characteristics of fly ash under low-low temperature

    LIU Hanxiao;YAO Yuping;LI Jianguo;LI Wenhua;FANG Xiaowei;GUO Ying;Zhejiang Feida Environmental Science and Technology Co.,Ltd.;Zhejiang Zheneng Wenzhou Power Generation Co.,Ltd.;

    To study the resistivity characteristics of fly ash under low-low temperature in ESP and discuss the feasibility of using mathematical model to calculate the resistivity of fly ash,the resistivity of fly ash in Yuhuan,Wenzhou and Chengxing power plants was measured online by BDL fly ash resistivity tester and calculated by R.E.Bickelhaupt model.Then,the calculated and measured values were compared.Results show that the resistivity under low-low temperature is significantly lower than that under normal temperature.However,there is a certain gap between the calculated and measured values,so the mathematical model needs further correction.

    2017 05 v.23;No.111 [Abstract][OnlineView][HTML全文][Download 1622K]
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