EGSB反应器布水装置进水方向对内部流场的影响王靖洲

·DOI10．3969/j．issn．1005-2895．2016．04．0052015-12-222016-02-201990。[e-mail]211816EGSBexpandedgranularsludgeblanket、-EGSB。0．555m/s。。EGSBX703A1005-2895201604-0022-05EffectofWaterDistributor'sInletDirectiononFlowFieldinEGSBＲeactorWANGJingzhouCHENYeSchoolofMechanicalandPowerEngineeringNanjingTechUniversityNanjing211816ChinaAbstractAccordingtothedisadvantagesofunevenwaterdistributinguniformityinadequatemixingandlargedeadzoneoftraditionalwaterdistributiondeviceinEGSBreactorancircumferentialwaterdistributionmodewasproposed．AnEulerian-Euleriantwo-phasesolid-liquidflowmodelwasformulatedtosimulatereactionzonehydrodynamicsinanEGSBreactorwithtraditionalwaterdistributionandcircumferentialwaterdistributioncondition．Bychangingthenumbersofthewaterinletpipestheflowvelocitywascontrolledreactionzonehydrodynamicsinreactorwithdifferentinletflowvelocitywasstimulated．Thesimulationresultsshowthatthereactorwithcircumferentialwaterdistributionhasbettersludgemixingeffectandhighersludgeexpandlevelandtheminimumflowrateofthemixingflowcanbeachievedbythecircumferentialdeviceis0.555m/s．Comparingwiththetraditionalaxialwaterdistributionmodethecircumferentialwaterdistributionmodecanmakethereactormorefullymixedandincreasethecontactareaofsludgeandwaterandprovidetheflowregimewhichismorefavorabletothebiochemicalreaction．KeywordsdistributordesignEGSBreactorCFDcomputationalfluiddynamicssolid-liquidtwophaseflowEular-Eular1974G．Lettinga。、、、、、。、。34420168LightIndustryMachineryVol．34No．4Aug．2016。。EGSBUASB。EGSB1。EGSB。、。。2。。2。。34。。5。。①②③④。。2①②。EGSB2m·s－1。。。1EGSB3。、。3、2。1．1EGSB200mm1200mmEGSB。3。1。35mm。1Figure1PhysicalmodelofwaterdistributiondeviceICEMCFD。253628。ANSYSFluent14．5。。1．21．2．12。·32··EGSBρkλkt+ρkλkuk=0。1k=lslsρ/kg·m－3λ/%u/m·s－1。ρ1ρkλkuk=0。2λkk=ls∑λk=λl+λs=1。3ρlλlult+ρlλlulul=－λlp+λlμefl*ul+ulT+ρlλlg+Ｒsl+Fl4ρsλsust+ρsλsusus=－λsp+λsμefs*us+usT+ρsλsg+Ｒsl+Fs。5g/m·s－2p/Paμef/Pa·sＲsl/NFs/Nusul。1．2．2Syamlal-O'Brien6Ｒsl=Ksl·us－ul=34CDμ·u3rsρ2lλsλlus－ul3。urs/m·s－1KslCD。DallaValle7CD=0．63+4．8Ｒes/u槡{}rs2。ＲesＲes=ρldsμl|us－ul|。ds/mμl/Pa·s。Fls=－FllFl=－Clρlλsul－us××ul。Clsaffman-Mei8-9Cl=32πＲe槡wC'l。ＲewＲew=ρl×uld2sμlC'lMeiKlausner10C'l=6．46×fＲesＲewＲes≤406．46×0．0524βＲes1/240＜Ｒes＜100{。βfβ=0．5Ｒew/ＲesfＲewＲes=1－0．3314β0．5e－0．1Ｒes+0．3314β0．5。1．2．3-。1050kg·m－30.37m·s－1。1500kg·m－31mm033%55%11。。4001×10－3。。32GBXeonＲCPU2．4GHz2。22．1。。。centre2。550mm525mm750mm。。2．2222。3。3a3b。3c。100～360mm。·42·LightIndustryMachinery20164tecplot4。。2Figure2Sludgedistributionineachpointofaxisunderdifferentinletdirection3Figure3Flowstateofsludgeincenterofreactorandsurroundingarea4Figure4Streamlineundercircumferentialinlet2．3。。。5m·h－13～61。1Table1Expansionheightofsludgebedunderdifferentinfluentflowrate//%/m·s－1/mmⅠ30．190．740750Ⅱ40．250．555720Ⅲ50．310．444550Ⅳ60．380．3705905。ⅠⅡⅠ。ⅢⅣ·52··EGSB0．25%。5Figure5Distributionofsludgevolumefractioninshaftsection3EGSB。。5m·h－10．25%。。。。1．M．2003218－219．2．J．199555－10．3．J．2002292－95．4．UASBD．200267－68．5．D．200769－71．6SYAMLALMO'BＲIENTJ．SimulationofgranularlayerinversioninliquidfluidizedbedsJ．Internationaljournalofmultiphaseflow1988144473－481．7DALLAVALLEJM．MicromeriticsJ．Soilscience1943562151．8SAFFMANPG．TheliftonasmallsphereinaslowshearflowJ．Journaloffluidmechanics1965222385－400．9SAFFMANPGSAFFMANPG．CorrigendumtothepaperTheliftonasmallsphereinslowshearflowJ．Journaloffluidmechanics1968962385－400．10MEIＲKLAUSNEＲJF．ShearliftforceonsphericalbubblesJ．Internationaljournalofheat＆fluidflow199415162－65．11．EGSBD．2010檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪33－34．165NIEUWSTADTFTMDIＲKZWAGEＲM．AfluidmechanicsmodelforanaxialcycloneseparatorJ．Industrialandengineeringchemistryresearch199534103399－3404．6．J．200927220－23．7．J．201432431－35．8．CFDJ．2014323108－111．9BOYSANFAYEＲSWHSWITHENBANJ．AfundamentalmathematicalmodelingapproachtocyclonedesignJ．Transactionsoftheinstitutionofchemicalengineers198260222－230．10FＲASEＲSMABDEL-ＲAZEKAMABDULLAHMZ．ComputationalandexperimentalinvestigationsinacyclonedustseparatorJ．AＲCHIVEproceedingsoftheinstitutionofmechanicalengineerspartEjournalofprocessmechanicalengineering19972114247－257．11HOEKSTＲAAJDEＲKSENJJVanDenAKKEＲHEA．AnexperimentalandnumericalstudyofturbulentswirlingflowingascyclonesJ．Chemicalengineeringscience199954suppl13/142055－2065．12GONGGuangcaiYANGZhouzhouZHUShaolin．NumericalinvestigationoftheeffectofhelixangleandleafmarginontheflowpatternandtheperformanceoftheaxialflowcycloneseparatorJ．Appliedmathematicalmodelling20123683916－3930．13DELGADILLOJAＲAJAMANIＲK．Acomparativestudyofthreeturbulence-closuremodelsforthehydrocycloneproblemJ．Internationaljournalofmineralprocessing2005774217－230．14．D．200986．·62·LightIndustryMachinery20164