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227Vol.22No.7Jul.200220027ProceedingsoftheCSEE©2002Chin.Soc.forElec.Eng.0258-8013200207-0155-05NOx,,,,,(,150001)STUDYONAPPLICATIONOFNEWTYPEHBC-SSABURNERSWITHLOWNOXEMISSIONSINALEANCOALFIREDBOILERNIEQi-hongSUNShao-zengWUShao-huaDENGChun-jianSUNRuiQINYu-kunSchoolofEnergyScienceandEngineering,HarbinInstituteofTechnologyHarbin150001,ChinaABSTRACT:ThemechanismofNOxformationinpulverisedcoalcombustionisintroducedinthispaper.Theconceptofhorizontalbiascombustion(HBC)anditsprincipleofreducingNOxemissionarealsodescribed.InsituexperimentalstudiesweremadeontheNOxemissionandunburntcarbonlossina300MWleancoalfiredboiler,whichadoptedanewkindofHBCburnerwiththesidesecondaryair(HBC-SSA)andthehorizontallyoffsetsecondaryairnozzles.Effectofoperationalparameters,suchastheprimaryair(PA)velocity,theoilsecondaryair(SA)damperpercentage,theSAdistribution,theSAhorizontallyoffsetangle,theOFA,thePAandcoalmixtureswitching,andthefurnaceexcessaironunburntcarboninflyashandtheNOxemissionwereobtained.ExperimentalresultsshowthathorizontalbiascombustioncangreatlydecreasetheemissionofNOxwhilekeepinghighcombustionefficiencyandoutstandingflamestabilityunderlowloadwithoutsupportingfueloil.KEYWORD:NOx;coalcombustion;horizontalbiascombustion;HBC-SSAburnerNOxNOx300MWNOxNOxNOxNOxTK244A1NOx100108kWhNOx2.93.8104[1]2NOx[2~4]NOxNO2NONO90%,NO25%10%NOxNONO3NONON21500NONO20%40%NONONO75%80%3NOx[5]15622OxNONHiN2NHiNHiNOxNOxNOx4NOx9ABB-CEDG1025/18.2—4WR300MW,11Tab.1Proximateandultimateanalysisoftypicalcoalduringtests/%/%VdafAarMarCarHarSarNarOar15.8525.623.6261.493.090.831.284.07Qnet,ar/(kJ⋅kg-1)24,110CEWR58OFA2(AA)(A)(AB)(B)(BC)(C)(CC)(DD)(D)(DE)(E)(EE)(XX)(YY)(OFA)(BCCCEE)NOx300MWNOx4.3.12D4DD422214.3.21D4DD4NOxNOxMSI1%NOxNONO2NO6%mg/Nm3NOx(2)W1NOxNOx122m/s24m/s3200Pa3600PaCfh2.6%1.3%24m/s26m/s3900PaCfh1.7%7NOx1571NOxNOx3.02.62.21.81.41080107210641056104820.023.226.4W1/(m⋅s-1)W1-CfhW1-NOxCfh/%[NOx]/(mg⋅Nm-3)([O2]=6%)1CfhNOxFig.1EffectofprimaryairvelocityonunburntcarboninflyashandNOxemission3NOxNOx22NOx3.02.62.21.81.4101826344250F/%Cfh/%1000998996994992[NOx]/(mg⋅Nm-3)([O2]=6%)CfhNOx2CfhNOxFig.2EffectofoilsecondaryairdamperpercentageonunburntcarboninflyashandNOxemissionNOx3ABNOx3ABNOx15%70%NOx52mg/m3NOx02040608010010009809609409201000980960940920ABF/%[NOx]/(mg⋅Nm-3)([O2]=6%)3ABNOxFig.3EffectofoilsecondaryairABdamperPercentageonNOxemission4NOx1NOx4NOxNOxNOx150mg/m3NOxNOx1100106010209809403.02.62.21.81.4Cfh/%CfhNOx[NOx]/(mg⋅Nm-3)([O2]=6%)4CfhNOxFig.4EffectofsecondaryairdistributiononunburntcarboninflyashandNOxemission2OFANOxOFANOx5100%NOx158220%60mg/m3NOx(1)300MW1NOx63.5%950930910890870950930910890870020406080100OFAF/%[NOx]/(mg⋅Nm-3)([O2]=6%)5NOxFig.5EffectofOFAdamperpercentageonNOxemissionNOx6NOxNOxNOxNOx3.4%NOx2NOxbNOx77NOx16°NOx9008207406806003.02.62.21.81.4Cfh/%[NOx]/(mg⋅Nm-2.63.43.9[O2]/%CthNOx6CfhNOxFig.6EffectofFurnaceexcessaironunburntcarboninflyashandNOxemission0°NOxNOx16°NOxNOxNOx640620600580560[NOx]/(mg⋅Nm2.62.42.22.01.8Cfh/%048121620b/(°)CfhNOx7CfhNOxFig.7EffectofhorizontaloffsetanglesofsecondaryonunburntcarboninflyashandNOxemission3)NOx8NOx760730700670640[NOx]/(mg⋅Nm-760730700670640448NOxFig.8EffectofprimaryairandcoalmixtureswitchingonNOxemissionNOx7NOx159NOx130mg/m3NOxNOx(2)120MW40%120MW9hABC3122NOx2Tab.2Testresultsunderlowloadoperation/MW[O2]/%[CO](μL/L)[NOx]/(mg/m3)(O2=6%)Cfh/%T/T/1202.561544142.2524481(3)33NOx650mg/m33Tab.3Comparisonofcombustionperfor-mancebeforeandaftertheretrofit[NOx]300MW(mg⋅m-3)([O2]=6%)uash/%W/MW7502.71406312.3120%12016%0.4%14.8%20MW14.3%120MW59300MW(1)NOx(2)[1]BiYusen.NOxCurrentsituation,forecastandtechnicalpoliceofNOxemissionofutilityboilers[J].ElectricPower.1998,31(12)59-62.[2]FengJunkaietal..Principleandcalculationofboilers[M].BejingSciencePress,1992.[3]OkazakiK,etal.SeparationofthebasicfactorsaffectingNOformationinpulverizedcoalcombustion[C].Proceedingsofthe20thSymposium(International)onCombustion,TheCombustionInstitute,1984.1381-1389.[4]SunShaozeng.Studyoncombustionprocesseswithhorizontalbiascombustionpulverizedcoalburners[D].(HarbinInstituteofTechno-logy).1995.[5]ZhangZe.Studyonflowpropertiesandapplicationofhorizontalbiascombustionpulverizedcoalburnerwithsidesecondaryairintangentiallyfiredboiler[D].(HarbinInstituteofTechnology).2000.2001-10-05(1974-),(1963-)