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1、PowderTechnology178(2007)173–178www.elsevier.com/locate/powtecShortcommunicationAnewmethodtoevaluatehorizontalsoliddispersioninabubblingfluidizedbedab,⁎aINyomanSupraptaWinaya,TadaakiShimizu,DaisukeYamadaaGraduateSchoolofScienceandTechnology,NiigataUniv
2、ersity,JapanbDepartmentofChemistryandChemicalEngineering,NiigataUniversity,JapanReceived23February2007;receivedinrevisedform1May2007Availableonline13May2007AbstractAnewmethodtoevaluatehorizontaldispersionofsolidsinbubblingfluidizedbedsisproposed:acarbo
3、n-loadedbedmaterialpreparedusingthecapacitanceeffect(volatilemattercapturedbyporousparticles)isusedasatracer.Thetracerparticlesareidenticaltotheremainderofthebedmaterial,exceptforcarbon-loadingofafewweightpercent.Theextentofsoliddispersionisevaluatedby
4、measuringthehorizontalconcentrationprofileofCO,whichisformedbythereactionofcarboninthetracerswithCO2inthefluidizinggas.TransientchangeinthehorizontalCOconcentrationprofileismeasuredinthefreeboardandtheexperimentalresultsarecomparedwiththetheoreticallyc
5、alculatedresultsofone-dimensionaldiffusionofsolids.Thereby,thehorizontaldispersioncoefficientisdetermined.Theexperimentalresultsagreewithresultsobtainedfromtheliterature.©2007ElsevierB.V.Allrightsreserved.Keywords:Horizontalsoliddispersion;Fluidizedbed
6、;Carbon-loadedmaterials;Tracer1.Introductionobtained,handled,anddetected,withparticledensityandsizethatareidentical,oratleastsimilar,tothebedmaterial;theHorizontalmixingofsolidsinfluidizedbedconversionparticlesmustbeeasilyremovedfromthebedmaterialafter
7、processesisoneofimportantcomponentsforoperationandmixing,andbeapplicabletoexperimentsatelevatedtempera-designofcommercialunits.Theconversionefficiencyofthetures.Varioustracershavebeenused.Saltparticleshavebeensystemwilldecreasebecauseofpoorcontactofsol
8、idswithused[1,2],buttheypresentdifficultiesoftracerremovalafterthegaseousreactantsifthesolidsarenotfullymixedhorizontally.experiments.Forthatreason,repeatedexperimentsareusuallyInaddition,poorsolidmixingmightcauseundesiredtemper-difficu
