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1、PergamonChemicalEnqineerin(4Science,Vol.52,No.18,pp.30853099,1997a?,1997ElsevierScienceLtd.AllrightsreservedPrintedinGreatBritainPII:S0009-2509{97)00126-700092509/97$17.00+0.00ModelingtheabsorptionofSO2inasprayscrubberusingthepenetrationtheoryCharlotteBrogren**and
2、HansT.KarlssonDepartmentofChemicalEngineeringII,LundUniversity,CenterforChemistryandChemicalEngineering,P.O.Box124,S-22100Lund,Sweden;*ABBCorporateResearch,S-72178V~isterhs,Sweden(Received2January1997,acceptedinrevisedform7April1997)Abstract---Amodelbasedonthepene
3、trationtheoryhasbeendevelopedtocalculatethedynamicabsorptionrateofsulfurdioxideintoadropletoflimestoneslurry.Themodelincludesbothinstantaneousequilibriumreactionsandreactionswithfiniterates;limestonedissolution,sulfiteoxidation,gypsumcrystallizationandthehydrolysi
4、sreactionofCO2.ThemodelhasbeenusedtoquantifythemasstransferwithinasprayscrubberandtoestimatetheimpactofthereactionswithfiniterateoftheSO2masstransfer.Thevariationswithinthephysicalmasstransferconditionsofasprayscrubberhavebeensimulatedbyassuminghighmasstransfercoe
5、fficientsclosetothenozzlesandlowcoefficientsbelowthesprayregion.Thedevelopedconcentrationprofilesofthediffusingspeciesandthedepthofpenetrationhavebeendeter-minedfordifferentpenetrationtimes.ThecalculationsshowthattheabsorptionofSO2intoalimestonesprayscrubbertoalar
6、geextentisliquid-sidecontrolled.Onlyattheverytopoftheabsorber,wherethepartialpressureofSOzislow,isthegasfilmresistanceabove50%.Limestonedissolutionclosetothegas-liquidinterfacehasbeenshowntobeofsignificanceatlowpHandinthepartsoftheabsorberwheretheinternalcirculati
7、oninsidethedropletsislow.TheimpactofthehydrolysisreactionofCO2ontheabsorptionrateofSO2hasbeenstudiedbyvaryingthereactionrateconstant.Simulationsshowthattherateconstanthasalargeimpactonlocalabsorptionrates.Dependingonthelengthofthecontacttimebetweenthegasandtheliqu
8、id,theassumptionofaninstantaneoushydrolysisreactionhasanimpactontheoverallSO2absorptionrate.©1997ElsevierScienceLtdKeywords:Masstransfer;SO:;limestone;p
