外文翻译--循环流化床锅炉中飞灰含量的研究.doc

外文原文ResearchonCarbonContentinFlyAshfromCirculatingFluidizedBedboilersAbstractThecarboncontentintheflyashfrommostChinesecirculatingfluidizedbed(CFB)boilersismuchhigherthanexpected,whichdirectlyinfluencesthecombustionefficiency.Inthepresentpaper,carbonburnoutwasinvestigatedinbothfieldtestsandlaboratoryexperiments.Theeffectofcoalproperty,operationcondition,gas-solidmixing,chardeactivation,residencetime,andcycloneperformanceareanalyzedseriatimbasedonalargeamountofexperimentalresults.Acoalindexisproposedtodescribethecoalrank,havingastrongeffectonthecharburnout.Badgas-solidmixinginthefurnaceisanotherimportantreasonofthehighercarboncontentintheflyash.Somecharsintheflyasharedeactivatedduringcombustionoflargecoalparticlesandhaveverylowcarbonreactivity.Severalsuggestionsaremadeaboutdesign,operation,andmodificationtoreducethecarboncontentintheflyash.IntroductionWiththeadvantagesoffuelflexibilityandlowpollutantemission,circulatingfluidizedbed(CFB)combustiontechnologyhasbeendevelopedrapidlyinpowergeneration.ThecapacityofCFBpowerplantshasbeengrowingsteadilyeversincethecommercializationofthetechnologyinthelate1970s.Currently,themaximumcapacityofasingleCFButilityboilerisontheorderof300MWeandmorelargecapacityunitsof600and800MWesupercriticalpressureCFBboilersaredeveloping.ThedevelopmentofCFBboilersinChinastartedinthe1980s,andthemaximumcapacityforasingleunithasbeenincreasingyearafteryear,asshowninFigure1.Thereareover1000CFBboilersinoperationupto2004,includingover20unitsabove135MWe.Inaddition,80unitsof135MWeand10unitsof300MWeCFBboilersareinconstructionoronorder.Figure1Maximumcapacityforasingleunit.However,itisafactthatthecombustionefficiencyofCFBboilersislowerthanthatofpulverizedcoalfired(PC)boilers,thoughhighcombustionefficiencywasreportedintheCFBmarketabroad.HYPERLINK"http://pubs.acs.org/cgi-bin/article.cgi/enfuem/2005/19/i04/html/ef049678g.html/QueryZIP/C3-I/(((boiler)%3cIN%3e(atl,title)))%3cAND%3e(RDATE@@%3e=@@20000101)%3cAND%3e(RDATE@@%3c=@@20060131)"\l"ef049678gb00001"1Brownco