flow structure-2011-Effects of particle properties on flow structure in a 2-D circulating fluidized bed Solids concentration distribution and flow development

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1、ChemicalEngineeringScience66(2011)5064–5076ContentslistsavailableatScienceDirectChemicalEngineeringSciencejournalhomepage:www.elsevier.com/locate/cesEffectsofparticlepropertiesonflowstructureina2-Dcirculatingfluidizedbed:Solidsconcentrationdistributionandflowde

2、velopmentnJingXu,JesseZhuParticleTechnologyResearchCentre,DepartmentofChemical&BiochemicalEngineering,TheUniversityofWesternOntario,London,Ontario,CanadaN6A5B9articleinfoabstractArticlehistory:Theeffectsofparticleproperties(particledensity,sizeandsphericity)

3、onsolidsconcentrationina2-DReceived14January2011riserwerecomprehensivelyinvestigatedbymeasuringtheaxialandlateralsolidsconcentrationwithReceivedinrevisedformanopticalfiberprobe.Inthisstudy,solidsconcentrationofdifferenttypesofparticlesshowsthat17June2011heavi

4、erparticleshavehighersolidsconcentrationlaterallyandaxiallythanlighterparticles;largerAccepted28June2011particlesresultinmorecompactsolidsdistributionandsuchsizeeffectismoreevidentattheriserAvailableonline23July2011bottom;moresphericalparticlesleadtohigherso

5、lidsconcentration.VariousforcesactingonparticlesKeywords:andthechangeintheslipvelocitybetweengasandparticleswereusedtoexplaintheeffectsofparticleFluidizationpropertiesonsolidsdistribution.Hydrodynamics&2011ElsevierLtd.Allrightsreserved.2-DCFBSolidsconcentrat

6、ionParticlepropertiesOpticalfiberprobe1.IntroductionoperationoftheindustrialCFBreactors(MastelloneandArena,1999).TheexperimentsconductedbyBaietal.(1992)showedaxialCirculatingfluidizedbed(CFB)reactorshavebeenusedforawidevoidageprofilesofparticleswithdifferentsiz

7、eanddensitybyrangeofindustrialapplicationsoverthepast50years.Hydrody-employingpressuregradienttransducers.Theresultsindicatedthatnamicsofgas–solidtwo-phaseflowinCFBsystemsoftenaffectthethedifferenceinvoidagedistributionbetweendifferentparticlesizesmasstransfe

8、r,heattransfer,gasandsolidsmixingaswellasthebecomessmallerwithhighergasflowrateandlowersolidscircula-chemicalreaction.Theaxialandradialsolidsdistributionsrepresent-tionrate,andthatheavierparticle