资源描述：
《外文翻译循环流化床锅炉中飞灰含量的研究》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、外文原文ResearchonCarbonContentinFlyAshfromCirculatingFluidizedBedboilersAbstractThecarboncontentintheflyashfrommostChinesecirculatingfluidizedbed(CFB)boilersismuchhigherthanexpected,whichdirectlyinfluencesthecombustionefficiency.Inthepresentpaper,carbonburnoutwasinvestigatedinbothfieldtestsan
2、dlaboratoryexperiments.Theeffectofcoalproperty,operationcondition,gas-solidmixing,chardeactivation,residencetime,andcycloneperformanceareanalyzedseriatimbasedonalargeamountofexperimentalresults.Acoalindexisproposedtodescribethecoalrank,havingastrongeffectonthecharburnout.Badgas-solidmixing
3、inthefurnaceisanotherimportantreasonofthehighercarboncontentintheflyash.Somecharsintheflyasharedeactivatedduringcombustionoflargecoalparticlesandhaveverylowcarbonreactivity.Severalsuggestionsaremadeaboutdesign,operation,andmodificationtoreducethecarboncontentintheflyash.IntroductionWiththe
4、advantagesoffuelflexibilityandlowpollutantemission,circulatingfluidizedbed(CFB)combustiontechnologyhasbeendevelopedrapidlyinpowergeneration.ThecapacityofCFBpowerplantshasbeengrowingsteadilyeversincethecommercializationofthetechnologyinthelate1970s.Currently,themaximumcapacityofasingleCFBut
5、ilityboilerisontheorderof300MWeandmorelargecapacityunitsof600and800MWesupercriticalpressureCFBboilersaredeveloping.ThedevelopmentofCFBboilersinChinastartedinthe1980s,andthemaximumcapacityforasingleunithasbeenincreasingyearafteryear,asshowninFigure1.Thereareover1000CFBboilersinoperationupto
6、2004,includingover20unitsabove135MWe.Inaddition,80unitsof135MWeand10unitsof300MWeCFBboilersareinconstructionoronorder.Figure1Maximumcapacityforasingleunit.However,itisafactthatthecombustionefficiencyofCFBboilersislowerthanthatofpulverizedcoalfired(PC)boilers,thoughhighcombustionefficiencyw
7、asreportedintheCFBmarketabroad.1Browncoals,withhighactivity,arecommonlyburnedabroad,whichisthemainreasonforlowcarboncontentintheflyash.InChina,onthecontrary,mostCFBboilersburnhardcoalssuchasanthracite,bituminous,andcoalwastes;thecarboncontentintheflyashismuchh
