A new correlation for predicting solids concentration in the fully developed zone of

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1、PowderTechnology188(2008)64–72ContentslistsavailableatScienceDirectPowderTechnologyjournalhomepage:www.elsevier.com/locate/powtecAnewcorrelationforpredictingsolidsconcentrationinthefullydevelopedzoneofcirculatingfluidizedbedrisersa,ba,⁎,Wei-XingHuangbX

2、iao-BoQi,JesseZhuaDepartmentofChemicalandBiochemicalEngineering,UniversityofWesternOntario,London,Ontario,CanadaN6A5B9bSchoolofChemicalEngineering,SichuanUniversity,Chengdu,Sichuan610065,ChinaARTICLEINFOABSTRACTArticlehistory:Thepresentworkfocusesonde

3、velopinganewcomprehensivecorrelationforbetterpredictionofthesolidsReceived11December2007concentrationinthefullydevelopedregionofco-currentupwardgas–solidflowincirculatingfluidizedbedReceivedinrevisedform5March2008(CFB)risers.Systematicexperimentswerecar

4、riedoutintworisers(15.1mand10.5mhighwiththesameAccepted26March20080.1mi.d.)withFCCandsandparticles.Theresultsobtainedfromabout200setsofoperatingconditionsAvailableonline8April2008showthattheaveragesolidsconcentrationinthefullydevelopedregionismorethan

5、justafunctionofthecorrespondingterminalsolidsconcentration,asmostpreviouscorrelationsarebasedon.OperatingKeywords:Correlationconditions,particlepropertiesandriserdiametersalsohavesignificanteffectsonthesolidsconcentrationsinCirculatingfluidizedbedsthefu

6、llydevelopedregionofCFBrisers.BasedonourexperimentaldataandthosereportedintheopenSolidsconcentrationliteraturefromCFBrisersupto0.4mindiameterand27minheightwithsuperficialgasvelocitiesandsolidsRiser2circulationratesupto11.5m/sand685kg/m·s,anewempiricalc

7、orrelationforpredictingtheaveragesolidsFullydevelopedflowconcentrationsinthefullydevelopedregionofCFBrisersisproposed.ThecorrelationworkswellforawideGas–solidtwo-phaseflowrangeofoperatingconditions,particlepropertiesandriserdiameters.©2008ElsevierB.V.Al

8、lrightsreserved.1.IntroductionvariouscorrelationsintheliteratureislistedinTable1.EarlierstudiessuchasKunniiandLevenspiel[8]usuallyassumedtheflowattheexitWithitsexcellentmassandheattransfercharacteristics,gas–orinthefullydevelopedregionofCFBrise