矿井乏风对锅炉燃烧特性影响
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摘要
对某2 027 t/h四角切圆燃煤锅炉采用矿井乏风作为一次风和二次风的燃烧工况进行数值模拟,在验证模型可行性的基础上,研究了乏风中甲烷体积分数对炉膛温度以及NOx排放的影响。结果表明:随着乏风中甲烷体积分数的增加,炉膛内燃烧区平均温度最大增加53 K;炉膛中氧体积分数和NO质量浓度及煤粉燃尽率随着乏风中甲烷体积分数的升高而降低,而CO变化趋势相反;炉膛出口NO平均质量浓度从388.21 mg/m3降低至318.88 mg/m3,降低幅度达到17.80%。使用矿井乏风作为锅炉一次风和二次风能够有效降低NOx的排放。
The effect of applying mine ventilation air methane as primary and secondary air on coal combustion was numerically studied for a 2 027 t/h tangentially coal-fired boiler. After verifying the feasibility of model, the influences of volume fraction of the ventilation air methane(VAM) on furnace temperature and emission characteristics of NOx were investigated. The results show that, with an increase in volume fraction of the methane in the air, the average temperature in the main combustion zone increased by 53 K at the most, while the concentration of NO and O2 in the furnace and burnout rate of the coal decreased. The CO concentration changed in the opposite. The average concentration of NO at the furnace outlet decreased from 388.21 mg/m3 to 318.88 mg/m3, by 17.8%. It can be concluded that applying mine ventilation air methane as primary and secondary air of the boiler can reduce the NOx emission effectively.
The effect of applying mine ventilation air methane as primary and secondary air on coal combustion was numerically studied for a 2 027 t/h tangentially coal-fired boiler. After verifying the feasibility of model, the influences of volume fraction of the ventilation air methane(VAM) on furnace temperature and emission characteristics of NOx were investigated. The results show that, with an increase in volume fraction of the methane in the air, the average temperature in the main combustion zone increased by 53 K at the most, while the concentration of NO and O2 in the furnace and burnout rate of the coal decreased. The CO concentration changed in the opposite. The average concentration of NO at the furnace outlet decreased from 388.21 mg/m3 to 318.88 mg/m3, by 17.8%. It can be concluded that applying mine ventilation air methane as primary and secondary air of the boiler can reduce the NOx emission effectively.
引文
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[2]黄格省,于天学,李雪静.国内外煤层气利用现状及技术途径分析[J].石化技术与应用, 2010, 28(4):341-346.HUANGGesheng, YUTianxue,LIXuejing.Utilization statusandtechnologiesofglobalcoal-bedgas[J].PetrochemicalTechnology&Application,2010,28(4):341-346.
[3]马新涛,刘朋.浅析煤层气浓缩技术研究及发展[J].陕西煤炭, 2010, 29(5):56-58.MAXintao,LIUPeng.Analysisonconcentration technologyofcoal-bedmethaneanditsapplication[J].Shaanxi Coal, 2010, 29(5):56-58.
[4]高增丽,高振强,刘永启,等.矿井乏风瓦斯治理利用现状与发展[J].冶金能源, 2010, 29(5):43-46.GAOZengli,GAOZhenqiang,LIUYongqi,etal.Actualityanddevelopmentofharnessandutilizationof coalmineventilationairmethane[J].Energyfor Metallurgical Industry, 2010, 29(5):43-46.
[5]李桂芳.浅谈煤矿电力节能管理工作重点[J].科技资讯, 2010(35):101.LI Guifang. Discussion on energy saving management of coalmine[J].Science&TechnologyInformation,2010,(35):101.
[6]鞠胤红,曾祥昊,王梦纯. HG-420/13.7-YM3型锅炉热风改乏气送粉方式探讨[J].黑龙江科学,2017,8(4):118-119.JUYinhong,ZENGXianghao,WANGMengchun.Discussiononthemodetransformationfromhot-airto exhaust-deliver-powderofHG-420/13-7-YM3boiler[J].Heilongjiang Science, 2017, 8(4):118-119.
[7]CAROTHERSP,DEOM.Technicalandeconomic assessment:mitigationofmethaneemissionsfromcoal mineventilationair[R].CoalBedMethaneOutreach Program.Washington:USEnvironmentalProtection Agency, 2000.
[8]赵坚行.燃烧的数值模拟[M].北京:科学出版社,2002:1-32.ZHAO Jianxing. Numerical simulation on combustion[J].Beijing:Science Press, 2002:1-32.
[9]沈跃云,高小涛. 600 MW超临界机组墙式燃烧锅炉运行特性的数值模拟计算研究[J].华东电力,2014,42(7):1460-1464.SHENYueyun,GAOXiaotao.Numericalsimulationof waii-firedboileroperationcharacteristicsin600MW supercriticalunit[J].EastChinaElectricPower,2014,42(7):1460-1464.
[10]丁历威,李凤瑞. Fluent软件模拟计算煤粉燃烧的机理及其模型实现的方式[J].浙江电力,2010,29(11):31-34.DINGLiwei,LIFengrui.Mechanismandmodel realization of pulverized coal combustion simulation and calculation with Fluent[J]. Zhejiang Electric Power, 2010,29(11):31-34.
[11]于勇. Fluent入门与进阶教程[M].北京:北京理工大学出版社, 2008:188-191.YUYong.Introductionandadvancedtutorialsof Fluent[M]. Beijing:Beijing Institute of Technology Press,2008:188-191.
[12] HILLSC,SMOOTLD.Modelingofnitrogenoxides formationanddestructionincombustionsystems[J].Progress in Energy&Combustion Science, 2000, 26(4):417-458.
[13]王蕾. 600 MW对冲燃煤锅炉降低NOx排放的数值模拟[D].北京:北京交通大学, 2008:7-10.WANGLei.NumericalsimulationofNOxemission reductionfor600MWopposedcoal-firedboiler[D].Beijing:Beijing Jiaotong University, 2008:7-10.
[14] DíEZLI,CORTéSC,PALLARéSJ.Numerical investigation of NOx emissions from a tangentially-fired utilityboilerunderconventionalandoverfireair operation[J]. Fuel, 2008, 87(7):1259-1269.
[15] FANGQ,MUSAAAB,WEIY,etal.Numerical simulationofmultifuelcombustionina200MW tangentially fired utility boiler[J]. Energy&Fuels, 2012,26(1):313-323.