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时间:2020-03-26
《CO2气氛下煤燃烧特性实验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第42卷第4期燃料化学学报Vo1.42NO.42014年4月JournalofFuelChemistryandTechnologyApr.2014文章编号:0253.2409(2014)04-0408-06增压O2/CO2气氛下煤燃烧特性实验研究胡海华,段伦博,陈晓平,韩冬,潘玄(东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室,江苏南京210096)摘要:增压0/CO燃烧是一种可高效分离回收CO:的新兴燃烧技术,其燃烧机理与常压空气、常压Oz/CO燃烧存在较大差异。在加压热重分析仪上研究了增压条件下
2、总压、氧浓度、气氛及粒径等反应参数对美国烟煤和淮北无烟煤燃烧特性的影响,确定了煤的着火温度,并对其进行燃烧动力学分析。结果表明,增压0/CO:气氛下,随着压力或氧浓度的增加,DTG曲线向低温区移动,煤样整体燃烧速率加快。压力提升、氧浓度增加及煤粉细化均可改善O:/CO:气氛下煤样的着火特性。常压O,/CO气氛下煤粉燃烧基本属于一级反应;增压O:/CO气氛下,低温区属于0.5级反应,而高温区属于1.5级反应。关键词:02/CO,;燃烧特性;压力;热重分析;动力学中图分类号:TQ534文献标识码:AExperimen
3、talinvestigationonpressurizedcoalcombustioncharacteristicsunder02/CO2atmosphereHUHai—hua,DUANLun—bo,CHENXiao-ping,HANDong,PANXuan(KeyLaboratoryofEnergyThermalConversionandControlofMinistryofEducation,SchoolofEnergyandEnvironment,SoutheastUniversity,Nanjing210
4、096,China)Abstract:ThepressurizedO,/CO,combustionisapotentialtechnique,whichmakesCO,separationandrecoverymoreeficient.However.ithasanotablydifferentmechanismfromtheaircombustionandtheO,/CO,combustionunderatmosphericpressure.ThecombustioncharacteristicsofanAme
5、ricanbituminousCOalandaHuaibeianthracitecoalunderO./CO.atmospherewerestudiedemployingthethermo.gravimetricanalyzeratvariouspressures(P=0.1—1.5MPa).Theinfluencesofpressure。oxygenconcentration,atmosphereandparticlesizeonthecoalcombustioncharacteristicswereinspe
6、cted,andtheignitiontemperaturewasobtained.Also,thecombustionkineticparameterswerecalculated.Theresultsindicatethatasthetotalpressureoroxygenconcentrationincreases,DTGcurvesmovetothelowtemperaturezoneandtheoverallcombustionrateofCOalsamplesisacceleratedunderpr
7、essurizedO/CO.atmosphere.Theignitioncharacteristicsofpulverizedcoalcouldbeimprovedthroughthepressureenhancement,theincreaseofoxygenconcentrationandthereductionofparticlesize.ThepulverizedCOalcombustionunderatmosphericpressureisbasicallyafirstorderreaction.For
8、pressurizedoxy.fuelcombustion,thereactionorderis0.5underthelowtemperaturezone,whilethereactionorderbecomes1.5underthehightemperaturezone.Keywords:0々/CO2;combustioncharacteristics;pressure
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