开槽式圆盘涡轮搅拌器的气液分散特性

3812201012CHEMICALENGINEERING(CHINA)Vo.l38No.12Dec.2010:(1984),,,,Emai:[e-mail];,,,Emai:[e-mail]万勋1,2,周国忠2,夏建业1,张明1,虞培清2,唐寅1(1.,200234;2.,325028):0.49m,(SHY,HY)(SBTD,BTD),():;2,,(Pg/P0),;,,SBTD,BTD3%,SHYHY,:;;;;:TQ027.2:A:10059954(2010)12004004GasliquiddispersioncharacteristicofslottingbladediskturbinesWANXun1,2,ZHOUGuozhong2,XIAJianye1,ZHANGMing1,YUPeiqing2,TANGYin1(1.NationalBiochemicalEngineeringTechnologyResearchCenter,EastChinaUniversityofScienceandTechnology,Shanghai200234,China;2.ZhejiangGreatWallReducerCo.,Ltd.,Wenzhou325028,ZhejiangProvince,China)Abstract:Theinfluencesofimpeller(slottingornot)onthepropertiesofgasdispersion,gassedpowerconsumptionandgasholdup(volumefraction)werestudiedina0.49mstirredtankagitatedbysemicircleandparabolicbladesdiskturbine,whichwereidentifiedasHY(SHY)andBTD(SBTD).Theresultsshowthatthefloodingtransitionsmeasuredfromloadingtoflooding(LF)showahysteresiscomparedwiththatmeasuredfromfloodingtoloading(FL)withincreasingandfallinggasrates.Comparingthegassedpowerconsumptionandgasholdupbetweenthetwokindsofturbines,andunderthesameflownumber,theslottingimpellershavelowerrelativepowerdemand(Pg/P0),andthepowercurveschangealo.tAtthesamepowerconsumption,theslottingoneshavehighergasholdup,forexample,SBTD,whichisabout3%higherthanBTDimpelleroverawiderangeofgasrates;SHYisalsohigherthanHYturbine.Therefore,theslottingturbinesareworthyofbeingrecommendedtotheindustrialapplicationofthegasliquidstirredreactors.Keywords:stirredtank;slottingdiskturbine;flooding;gassedpowerconsumption;gasholdup,(kLa),[1]Riet[2],,,:()RushtonRietSmith[2]Nienow[3],;,[4][5](HEDT)(PDT),2:(SHY)(SBTD),HY,BTD,,,,11D=0.49m4D/10(0.15m,D/2),H=0.5mD0.2m(C=0.8D),42SBTDSHYBTDHY5.6mm35mm11Table1PowernumberforimpellersBTDSBTDHYSHY/mm200200200200/mm50505050/mm38383838/mm130130130130NP2.382.282.772.34,,,030m3/h,00.0425m/s,;SEAGMASONIC120S,:=(Hg-H0)/Hg(1)22.1,,,(LF)(FL)234Pg/P0Flg,2,FL,,,,,,,,,3Pg/P0Fig.3RelationshipbetweenPg/P0andFlgwithrisingandfallinggasrates2.24,5,,4Pg/P02,,HYBTDPg/P0,SHYSBTD41万勋等(2)Pg/P0,2Pg/P0=aFl-bgFr-c(2)2Pg/P0Table2RegressionresultsofPg/P0indifferentimpellersabcR2BTD0.6340.1250.0380.940SBTD0.4600.1730.0460.942HY0.4990.1940.0450.947SHY0.5100.1850.0090.967(2)FlgFrb,c4b,BTD,,Pg/P0;SBTDb,,4,5;c,N[6]Rushton:Pg/P0=CFl-0.25gFr-0.05,2,42.3[7]2,PT=Pg+Pe,Pe:Pe=Lg(Hg-S)qV(3)64PTm6Fig.6Influenceofmipellertypeongasholdupatdifferentairflowrates(vs=0.0042m/s),PTm,SBTD,PTmSBTDBTD3%5%,SHYHY2%,4220103812NP,PTm,,=!P∀Tmv#s(4)(4),33Table3Regressionresultsofgasholdupindifferentpaddleproperties!∀#R2BTD2.2090.4470.7800.988SBTD2.4700.5670.7790.973HY2.3400.4300.8040.993SHY2.0900.4680.7800.990∀,,PTm;#,vs,63,:(1)(SBTD,SHY),FLLF,FL,2(2),Pg/P0,(3),PTm,,SBTD,BTD3%5%,SHYHY,:a,!b,c,∀,#C,mD,md,mFlg,Flg=qV/(Nd3)Fr,Fr=N2d/gg,m2/sH,mHg(H0)(),mN,r/sNP,NP=P/(LN3d5)Pe,WPg(P0)(),WPm,W/kgPT,WPTm,W/kgqV,m3/hS,mvs,m/sL,kg/m3:[1],.[M].:,2000.[2]VAN!TRIETK,SMITHJM.ThebehaviorofgasliquidmixturesnearRushtonturbineblades[J].ChemEngSc,i1973,28(4):10311037.[3]NIENOWAW.Gasliquidmixingstudies:acomparisonofRushtonturbineswithsomemodernimpellers[J].TransIChemE,1996,74:414422.[4].[J].,2008,8(3):444448.[5].[J].,2009,9(5):854859.[6]MICHELBJ,MILLERSA.Powerrequirementsofgasliquidagitatedsystems[J].AIChEJ,1962,8(2):262266.[7],,,.[J].,1995,18(3):147150.43万勋等