大型电站锅炉的燃烧方式

(710049)[]300MW600MW,NOx,[]W:()W(,Vdaf13%),CE,B&WFW,W,B&WB&WSTEINW,,q4=1.1%1.8%,40%50%MCR[1],,,,[2]80,[3],,,,NOx,,,,:,,,,,,,,1W,,,,,,W600MW,W,,,W,,,,,,,,,,,,,[2]V2000(1)©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,qF=4.4MW/m26.3MW/m2;qr=1.4MW/m22.1MW/m2,1qV1[4][4][5][6,7][4][8]11121212121212/MW300600350350350350MCR/th-1102519001061.910001085.11085Wqv/kWm-3qF/MWm-2qr/MWm-21215.101.83103.55.341.48122.85.491.2496.183.581.011535.581.62()35.7%MCR35%MCR40%MCR30%MCR65%MCR50%MCR40%MCR45%MCRCE/SULZERTK3B&WB&WSG-1025/18.3-M3161900-25.3-541/566-CE-1000-25-545KT1190-19-540.6/5391190-540/540(3:1)19921992198819891994198919902,(qV,qF,qr),()qF,qF,,:,;:,,,:,[4,8],,,,,115,,,,WCVF,,,,3,W,,,45%,,,2000(1)W©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,(10%),,,(,)2.22.31.2,:(1),,,,(2)[11],,,,,,,,,,,,,,,,,,/[4],,,,,4NOx,,;,,,;,,,;(),NOx,2NOx2NOx[5][5][8][8][5][14][5]B[8][16]/MW235023502350235023502300225023503002600/g(KWh)-1315325340336.5410325328333319/%4.114.284.345.229.244.284.717.414.23NOx[13]/mgm-3()70060012001500541650630NOx,š£2000(1)©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,NOx,,NOx,,B&WDRB[17],NOx330mg/m3860mg/m3,DRB-XCLNOx(Vdaf23%29.1%)250mg/kg(427mg/m3)236mg/kg(403mg/m3),,,NOx1...,19932...,19963..()4.300600MW..,19965...,19936...,19937.300MW..,19968...,19939.UP.,1995(5)10.1025t/h.,1997(6)11...,199612...,199613.NOx..,199614...,199615.1025t/h..,199316600MW.,199617.B&W..,19962000(1)š¤©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.THERMALPOWERGENERATIONNo.1January2000ContentsONFUELBURNINGSYSTEMSOFLARGE-CAPACITYUTILITYBOILERSHeBoshuetal(8)Thispaperpresentsasummaryofthedevelopmentoffuelburningsystemsemployedinlarge-capacityutilityboilerswithunitcapacityof300-600MWinChina.TLCC-ANEWTECHNOLOGY-SCREENINGMODELFORELECTRICPOWERSTATIONXuYueetal(12)Thepaperpresentsatechnology-screeningmodel(TLCC),developedbyDOE(U.S)forelectricpowerstation,inwhichtheenvironmentalcostsareconclud2ed.Withthismodel.thetechnologyandfeasibilitystudyofagivenpowerstationcanbeperformed.Theconclusionsmaydiffergreatlywhenexternalcostsareconsidered,suchasthoseresultingfromenvironmentalimpact.INFLUENCEOFBOILERPARAMETERSONFURNACEHEATTRANSFERZhangYongfu(15)Thispaperpresentstheinfluenceoffurnacewalltemperatureonfurnaceradiativeheattransferandanimprovedfurnaceheattransfercalculationmethodisputforwardbasedontheanslysisofhightemperatureradiativeheattransferinfurnace.STUDYONN2OFORMATIONINCOALFIRED-FLUIDIZEDBEDZengDongetal(17)N2Oformationwasstudiedatdifferenttemperaturesonabenchscalefluidizedbedreactorforthreedifferentkindsofcoals.SpecialattentionwaspaidtoN2Oformationduringcoaldevolatilizationandcharcombustion.TestresultsindicatethatthetransformationrateofN2Odependsmuchoncoalrankindifferentstagesofcoalcombustion.ThereisahightransformationrateofN2Oduringcombustionofvolatilematter.Thehigherthevolatilecontent,thelowerthetrans2formationrateofN2O.ThemostinportantfactorinflucingN2Oemissionisthetemperatureinfurnace.STUDYANDTESTONHEATTRANSFEROFCFBSunXianbinetal(20)Atestofwater-wallheattransferwasconductedon1MWCFBCtestingfacility.TheimpactofCFBCoperationparametersonheattransferwasanalyzed.TheresultsprovidedatechnicalbasisforthedesignofCFBboileranddevelopmentofheattransfermodel.FURNACESLAGGINGOFTANGENTIAL-FIREDPCBOILERANDITSPREVENTIVEMEASURESLiFengruietal(22)Thispaperpresentsabriefintroductiontothefactorsthathaveimpactonfurnaceslaggingoftangential-firedboilersandpreventivemeasuresagainstfurnaceslagging.ANALYSISOFEXHAUSTSTEAMTEMPERATURERISINGOFHPTUBINEOFDOMESTIC300MWU2NITMANUFACTUREDWITHFOREIGNPATENTLiuAnetal(25)TemperaturerisingofHPturbineexhauststeam,whichaffectedtheeconomicperformanceofturbineunit,wasfoundduringoperationofa300MWturbineu2nitmanufacturedwithforeignpatent.Basedonfieldinvestigationandanalysisofunitdesign,operationandmaintenance,thefactorsaffectingtheeconomicper2formanceofHPturbinewereestimatedandthecausesoftemperaturerisingofHPturbineexhauststeamwereanalyzed.ANAPPROXIMATECALCULATIONMETHODTODETERMINETHEEFFECTOFFEEDWATERFLOWONTHERMALPERFORMANCEOFGENERATINGUNITJianCongguangetal(28)Basedonthermalbalancebetweenextractionsteamandfeedwaterinfeed-heaters,usingtheflugelformulaandmeasuredperformancecurvesunderisolatedconditionsandaddedheattransferequations,anapproximatecaculationmethodisgiventodeterminetheeffectoffeedwaterflowonthermalperformanceofgeneratingunit.FAILUREANALYSISOFROTORBLADEINTHE4THROWOFA21CN201TURBINEUNITLiFengetal(31)©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.