第23卷第2期2023年2月过程工程学报TheChineseJournalofProcessEngineeringVol.23No.2Feb.2023Full-loopsimulationandstabilityanalysisofagas-solidcirculatingfluidizedbedBoyuJIA1,2,XinhuaLIU2,GeWANG2,3,HuaiyuSUN1,BonaLU2,4*1.SchoolofChemicalEngineering,ShenyangUniversityofChemicalTechnology,Shenyang,Liaoning110142,China2.InstituteofProcessEngineering,ChineseAcademyofSciences,Beijing100190,China3.SinopecLubricantCompany,Beijing100085,China4.SchoolofChemicalEngineering,UniversityofChineseAcademyofSciences,Beijing100049,ChinaAbstract:Thegas-solidfluidizedbedhaswideapplicationinindustrysuchasrefinery,metallurgy,andorecalcination.Inthepracticaloperation,itisusuallycombinedwithotherunitslikeconveyingpipe,cyclone,downerandvalvestoruninafull-loopway.Comparedtosimulationofasingleoperatingunit,thefull-loopsimulationofthegas-solidcirculatingfluidizedbedsystemcanrevealinteractionsbetweendifferentoperatingcomponentsanddiagnosethesuddenchangeofoperation,thusbeingofgreaterimportanceinindustrialoperation.Inthisstudy,thefull-loopsimulationandstabilityanalysisofagas-solidcirculatingfluidizedbedofvirtualprocessengineering(VPE)arecarriedoutundertheframeworkoftwofluidmodelandkinetictheoryofgranularflow.Thesimulationshowsthatthereexistsperiodicfluctuationofsolidsvolumefractionandpressuredropintheriserwheretwodistinctfluidizationstates,i.e.,dilutefluidizationanddensefluidization,appearalternatively,becauseoftheoccurrenceofgasbypassing.Tofigureouttheunderlyingcause,theinfluenceofmodelfactors(mainlyrefertogas-soliddrag)andoperatingparameters(i.e.,solidinventoryandsuperficialvelocity)ontheperiodicfluctuationphenomenonisnumericallyinvestigated.Itisfoundthatchangingthedragmodelcannoteliminatethefluctuation,whilereducingthegasvelocityandincreasingthesolidinventoryareconducivetothestabilityofparticlecirculatingtransportationandavoidingtheoccurrenceof"gasbypassing"becauseoftheincreaseinpressuredropoftheLoop-seal.Onthisbasis,theLoop-sealvalvewhichisreportedtobecloselyrelatedtoparticleconveyingisfocusedo...
