板式塔降液管的机械消泡研究李育敏

36820088CHEMICALENGINEERING(CHINA)Vo.l36No.8Aug.2008:(301051):(1973)),,,,,E-mai:[e-mail];,李育敏,刘炳炎,俞晓梅,姚克俭(,310032):,V,V,,,,,V,,,13.1%)36.2%,10.5%)32.5%,7.1%)33.2%,5.1%)24.6%,,:;;;:TQ051.81:A:1005-9954(2008)08-0005-04MechanicaldefoamingindowncomeroftraycolumnLIYu-min,LIUBing-yan,YUXiao-me,iYAOKe-jian(StateKeyLaboratoryofBreedingBaseofGreenChemistry-SynthesisTechnology,CollegeofChemicalEngineeringandMaterialsScience,ZhejiangUniversityofTechnology,Hangzhou310032,ZhejiangProvince,China)Abstract:Anewstructuralcomponentsettledinthedowncomeroftraycolumnformechanicaldefoamingwasdeveloped.Thestructuralcomponentwascomposedofseveralcolumnsofcorrugatedsheetsinparalleleachother.Thecorrugatedsheethadtheformof+.Thecomponentwashal-fimmersedinthedowncomerfrothlayer.Thefrothliquidfallingfromweirimpactedwiththecorrugatedsheetsandthewavedfrothinthedowncomerrubbedwithcorrugatedsheetscontinuously,whichacceleratedthefrothruptureandreducedthefrothheightinthedowncomer.Thecorrugatedsheetwiththeformof+exertedforcedownwardsontheliquidinthedowncomer,whichreducedtheclearliquidheightinthedowncomer.Theexperimentalresultsindicatethatthestructuralcomponentisabletodiminishthefrothheightby13.1%-36.2%andtheclearliquidheightby10.5%-32.5%forthefoamingsystem,andtodiminishthefrothheightby7.1%-33.2%andtheclearliquidheightby5.1%-24.6%forthenonfoamingsystem.Sothenewstructuralcomponentcanreduceliquidheightinthedowncomeranddelaythedowncomerflood.Keywords:downcomer;mechanicaldefoaming;foamingsystem;traycolumn,,,,[1]Marangoni,Ross,[2],,Marangoni,,,[3],,,,[4],11.1,,,,,,,,,V,V,VV,11Fig.1Schematicdiagramofnewstructuralcomponentsettledinthedowncomeroftrayedcolumnformechanicaldefoaming1.2,,,,,,,,,,V,,,2V0.2mm,2,2,1A-V,(b);a-V,mm;b-V,mm;c-,mm;H-,mm2Fig.2Schematicdiagramofstructuralcomponentformechanicaldefoaming1Table1Parameterofstructuralcomponentformechanicaldefoaming1#2#A/(b)9060a/mm3036b/mm3036V22c/mm3030/mm7070H/mm150156300mm@200mm,330%,0.055g/L,-3,7mm,5.47%,50mm,300mm,30mm,30mm,0.7)1.5(m/s)##6#2008368(kg/m3)1/2;,10)60m3/(m2#h),,3Fig.3Schematicdiagramofexperimentapparatusofdowncomerstructuralcomponentformechanicaldefoaming33.1-,qF,1#2#2hh44(a)4(b),1#,13.1%)36.2%,1#,10.5%)32.5%,,,,,,,,4(c)4(d),2#1#2#VA,,1#,2#V,,1#4,Fig.4Relationshipbetweenkineticenergyfactorandclearliquidheightandfrothheightinthedowncomerforfoamingsystem3.2-,1#51#,7.1%)33.2%,#7#李育敏等5.1%)24.6%,5,Fig.5Relationshipbetweenkineticenergyfactorandclearliquidheightandfrothheightinthedowncomerfornonfoamingsystem3.3UU,6(a)(b),,,1#,,25%,6Fig.6Comparisonoffrothdensityinthedowncomer4V,V,,,,V,,,13.1%)36.2%,10.5%)32.5%;,7.1%)33.2%,5.1%)24.6%,,:[1]KISTERHZ.DistillationOperations[M].NewYork:McGrawHil,l1990:400-401.[2]THIELER,BRETTSCHNEIDERO,REPKEJU.Ex-perimentalinvestigationsoffoaminginapackedtowerforsourwaterstripping[J].IndEngChemRes,2003,42(7):1426-1432.[3],.[M].:,1997:264-265.[4],,.[J].,2005,25(10):57-59.#8#2008368