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循环流化床气固两相流动数值模拟的研究进展.docx

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循环流化床气固两相流动数值模拟的研究进展 Title:ResearchProgressonNumericalSimulationofCirculatingFluidizedBedGas-SolidTwo-PhaseFlow Abstract: Thecirculatingfluidizedbed(CFB)technologyhasgainedsignificantattentioninrecentyearsduetoitswiderangeofapplicationsinenergyconversion,chemicalreactions,andenvironmentalprotection.UnderstandingthecomplexfluiddynamicsandheattransferphenomenainCFBsystemsiscrucialforoptimizingtheirdesignandoperation.ThispaperaimstoprovideacomprehensivereviewoftheresearchprogressmadeinthefieldofnumericalsimulationofCFBgas-solidtwo-phaseflow. Introduction: Circulatingfluidizedbed(CFB)technologyhasemergedasapromisingoptionforvariousindustrialprocesses,suchascoalcombustion,biomassgasification,andchemicalreactions.TheuniquestructuralcharacteristicsofaCFBreactor,includingthecontinuouscirculationofsolidparticles,makeitessentialtounderstandtheflowbehaviorofgas-solidtwo-phaseflowsinthissystem.NumericalsimulationhasbecomeapowerfultooltostudythecomplexfluiddynamicsandheattransferinCFBs,enablingengineerstooptimizetheirperformanceanddevelopsustainableenergysolutions.Inthispaper,wereviewtherecentadvancesinnumericalmodelingofCFBgas-solidtwo-phaseflow. FlowPatternandHydrodynamicCharacteristics: Thetwo-phaseflowinaCFBcanexhibitvariousflowpatterns,includingthefastfluidizedbed,turbulentfluidizedbed,anddensephase.Severalnumericalmodels,suchasEuler-EulerandEuler-Lagrangeapproaches,havebeenemployedtoobtainadetaileddescriptionofthehydrodynamiccharacteristicsindifferentflowregimes.Theeffectsofbedgeometry,particlesizedistribution,andoperatingconditionsongas-solidflowbehaviorhavebeeninvestigatedusingvalidatednumericalmodels.Thestudyofbubbleformation,bubbledynamics,andsolidparticlebehaviorinCFBsiscrucialforimprovingtheirperformanceandoverallefficiency. HeatTransferandCombustion: UnderstandingheattransfercharacteristicsinCFBsisvitalforefficientcombustionandenergyconversion.Numericalmodelshavebeendevelopedtoinvestigatetheheattransferprocessandpredictthetemperaturedistributionwithinthebed.Theeffec