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1、英文原文LimestoneEffectsonNOxFormationinCFBCombustorsAbstractCirculatingFluidizedBed(CFB)combustiontechnologyhasbeenwidelyusedinpowergenerationwiththeconsiderationsofitsadvantagesineconomicallycontrollingSO2andNOxemissions.However,itisfoundthatNOXemissionincreasedup
2、to30%whenlimestoneisaddedintothecombustorfordesulphurization,especiallywithratherhighCa/Sratio.ThephenomenonofNOxaugmentwasdiscussedbasedonassociatedmechanismsandchemicalkinetics.Thecatalyticoxidizationeffect,preferentialconversioneffectfromHCNtoNH3,andreduction
3、effectonNOxwereanalyzed.Itisfoundlimestonecanactasacatalyst,increasingthereactionratesforthereactionassociatedwithNOxformation.Furthermore,CaOdecomposedCaCO3favorstheconversionofHCNtoNH3whentheyarereleaseinde-volatilizationprocess.DuetopreferentialoxidizationofN
4、H3toNOratherthantheunstableN2O,NOXemissionincreaseswithlimestoneinjection.WhenhighCa/Sisused,thereductioneffectbecomesdominatedandreducestheoverallNOXemission.KeywordsCFB,limestone,desulphurization,NOXformation,chemicalkinetics1.IntroductionCirculatingFluidizedB
5、ed(CFB)combustiontechnologyhasbeenwidelyusedinpowergeneration,becauseofitsadvantagesinsuchasthehighfuelflexibilityforburningvariouskindsofcoalsandthehighfeasibilityineconomicalemissioncontrol.GiventhatthecombustiontemperatureinCFBcombustors,e.g.,boilers,isusuall
6、ybetween1020~1120Kandsecondaryaircanbeinjectedatdifferentportsalongtheaxialdirection,theNOXconcentrationinthefluegascanbecontrolledtobemuchlowerthanthoseusingothercombustiontechnologies.ShowninFig.1,NOxemissionfromaCFBcombustorsarelowest,intherangeof100-220ppm,c
7、omparedwithotherkindsofcombustors[1].-16-Fig.1NOXemissionlevelfordifferentcombustionsystems[3]Whencoalswithhighsurfacecontentareburned,limestoneisaddedintoCFBboilersfordesulphurization.Withinthenormaltemperatures,theefficiencyoflimestonedesulphurizationcanbeupto
8、90%[1].Inadditiontothedesulphurization,limestonemayplayseveralotherpositiverolesinimprovingtheboilerperformanceofsuchascombustion,heattransfer,materialbalanceandashse
