循环流化床脱硫反应器流动特性的实验研究与数值模拟

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1、～同。Ⅷ州d、H㈨I；__⑩天串大蓦TIANJINUNIVERSJTY博士学位论文一级学科：动立王撰与工程垫擅理学科专业：丝王过程扭地作者姓名：奎签壬指导教师：．蓟盒搓煎援天津大学研究生院2005年4月ABSTRACTFluegasdesulfurizationinacirculatingfluidizedbedisquitcanoveltechonolgyathomeandabroad，andwhichpromisestohavebenefitsforthefuture．Thesubjectinvestigatedinthispaperwasthecirculat

2、ingfluidizedbeddesulfurizationreactor．TheexperimentalfacilityWaSestablishedalongwiththeventuridistributor,whichwasthelatesttechnologyutilizedintheindustry．Bymeansoftheexperimentalstudyandnumericalsimulationontheflowfieldsofsinglephaseandgas·solidtwophases，theflowcharacteristicsincircul

3、atingfluidizedbedweredescribed，andthemethodsofevaluatingtheflowbehaviorwereputforward．Theresultsprovideagoodplatformforthefurtherimprovementofventuriinletstructure，andgiveafavorablereferencetothetechnologicaldesignofheatandmasstransfer．Theexperimentalstudyandsimulationanalysisoftheflow

4、ofthesinglephasemodelshowedthattheflowprofilesintheriserwerebadlyaffectedbythesideinletduckandtherecirculatedsolidfeedinletpipe，whichresultsinavortexbehindtherecirculatedsolidinletpipe．Basedonthenumericalsimulationoftwo-equationk—smodel．theconceptsofnonaniformityofgasvelocityanddeadzon

5、epercentagewereusedtoquantitativelyanalyzethegasflowfieldintheriser．TheexperimentalstudyontheradialprofileofthelocalsolidconcentrationintheriseratdifferentconditionsWasperformedbyusinganopticalfiberprobe．Tlleresultsshowedthattheflowfieldofgas—solidphasesWasseriouslyaffectedbythesideinl

6、etduckandrecireulatedsolidfeedinletpipe。Atthesametime．thedefectedsolidflowappearedandtheradialprofileofthelocalsolidconcentrationwasveryuneven，whichbecamebetterobviouslyafterthegasinletconfigurationwasimproved．Thetwo—fluidmodelcombinedwiththekinetictheoryoftheparticulatephasewasbuilt．I

7、nthemodel，theeffectofparticlesongasturbulencewastakenintoaccountandthesourcetermofthegask一占modelwasmodified．Thenumericalsimulationofgas-solidflowintheexperimentalfacilitywascompleted．TheresultsShOWthattherevisedmodelcallbetterdescribethegas—solidflowphenomenoninthereactor．Theindus仃ia