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1、英文原文LimestoneEffectsonNOxFormationinCFBCombustorsAbstractCirculatingFluidizedBed(CFB)combustiontechnologyhasbeenwidelyusedinpowergenerationwiththeconsiderationsofitsadvantagesineconomicallycontrollingSO2andNOxemissions.However,itisfoundthatNOXemissionincreasedupto30%whenlimest
2、oneisaddedintothecombustorfordesulphurization,especiallywithratherhighCa/Sratio.ThephenomenonofNOxaugmentwasdiscussedbasedonassociatedmechanismsandchemicalkinetics.Thecatalyticoxidizationeffect,preferentialconversioneffectfromHCNtoNH3,andreductioneffectonNOxwereanalyzed.Itisfo
3、undlimestonecanactasacatalyst,increasingthereactionratesforthereactionassociatedwithNOxformation.Furthermore,CaOdecomposedCaCO3favorstheconversionofHCNtoNH3whentheyarereleaseinde-volatilizationprocess.DuetopreferentialoxidizationofNH3toNOratherthantheunstableN2O,NOXemissioninc
4、reaseswithlimestoneinjection.WhenhighCa/Sisused,thereductioneffectbecomesdominatedandreducestheoverallNOXemission.KeywordsCFB,limestone,desulphurization,NOXformation,chemicalkinetics1.IntroductionCirculatingFluidizedBed(CFB)combustiontechnologyhasbeenwidelyusedinpowergeneratio
5、n,becauseofitsadvantagesinsuchasthehighfuelflexibilityforburningvariouskindsofcoalsandthehighfeasibilityineconomicalemissioncontrol.GiventhatthecombustiontemperatureinCFBcombustors,e.g.,boilers,isusuallybetween1020~1120Kandsecondaryaircanbeinjectedatdifferentportsalongtheaxial
6、direction,theNOXconcentrationinthefluegascanbecontrolledtobemuchlowerthanthoseusingothercombustiontechnologies.ShowninFig.1,NOxemissionfromaCFBcombustorsarelowest,intherangeof100-220ppm,comparedwithotherkindsofcombustors[1].-13-Fig.1NOXemissionlevelfordifferentcombustionsystem
7、s[3]Whencoalswithhighsurfacecontentareburned,limestoneisaddedintoCFBboilersfordesulphurization.Withinthenormaltemperatures,theefficiencyoflimestonedesulphurizationcanbeupto90%[1].Inadditiontothedesulphurization,limestonemayplayseveralotherpositiverolesinimprovingtheboilerperfo
8、rmanceofsuchascombustion,heattransfer,materialbalanceandashse
