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1、外文原文ResearchonCarbonContentinFlyAshfromCirculatingFluidizedBedboilersAbstractThecarboncontentintheflyashfrommostChinesecirculatingfluidizedbed(CFB)boilersismuchhigherthanexpected,whichdirectlyinfluencesthecombustionefficiency.Inthepresentpaper,carbonbur
2、noutwasinvestigatedinbothfieldtestsandlaboratoryexperiments.Theeffectofcoalproperty,operationcondition,gas-solidmixing,chardeactivation,residencetime,andcycloneperformanceareanalyzedseriatimbasedonalargeamountofexperimentalresults.Acoalindexisproposedto
3、describethecoalrank,havingastrongeffectonthecharburnout.Badgas-solidmixinginthefurnaceisanotherimportantreasonofthehighercarboncontentintheflyash.Somecharsintheflyasharedeactivatedduringcombustionoflargecoalparticlesandhaveverylowcarbonreactivity.Severa
4、lsuggestionsaremadeaboutdesign,operation,andmodificationtoreducethecarboncontentintheflyash.IntroductionWiththeadvantagesoffuelflexibilityandlowpollutantemission,circulatingfluidizedbed(CFB)combustiontechnologyhasbeendevelopedrapidlyinpowergeneration.Th
5、ecapacityofCFBpowerplantshasbeengrowingsteadilyeversincethecommercializationofthetechnologyinthelate1970s.Currently,themaximumcapacityofasingleCFButilityboilerisontheorderof300MWeandmorelargecapacityunitsof600and800MWesupercriticalpressureCFBboilersared
6、eveloping.ThedevelopmentofCFBboilersinChinastartedinthe1980s,andthemaximumcapacityforasingleunithasbeenincreasingyearafteryear,asshowninFigure1.Thereareover1000CFBboilersinoperationupto2004,includingover20unitsabove135MWe.Inaddition,80unitsof135MWeand10
7、unitsof300MWeCFBboilersareinconstructionoronorder.Figure1Maximumcapacityforasingleunit.However,itisafactthatthecombustionefficiencyofCFBboilersislowerthanthatofpulverizedcoalfired(PC)boilers,thoughhighcombustionefficiencywasreportedintheCFBmarketabroad.
8、1Browncoals,withhighactivity,arecommonlyburnedabroad,whichisthemainreasonforlowcarboncontentintheflyash.InChina,onthecontrary,mostCFBboilersburnhardcoalssuchasanthracite,bituminous,andcoalwastes;thecarboncontentintheflyashismuchh
