添加剂强化石灰石湿法烟气脱硫实验研究

:2005-01-15:(2001AA527010):(1981-),(),,.,,,(,100084):Na2SO4MgSO4,CaCO3.,Na2SO4MgSO4CaCO3,Na2SO4.,CaCO3.,0105molPL,CaCO3,,Na2SO4MgSO4.N2SO2(SO2)((SO2)20003000mgPm3),SO2pH,.,0105molPLNa2SO4MgSO4,CaCO3SO2,.:;;;pH:X70113:A:1001-6929(2006)01-0039-04ExperimentalStudyonAdditiveEnhancedLimestoneWetFlueGasDesulfurizationMALi2bo,XIANGGuang2ming,ZHAOXu2dong,YAOQiang(KeyLaboratoryofThermalScienceandPowerEngineering,DepartmentofThermalEngineering,TsinghuaUniversity,Beijing100084,China)Abstract:ThelimestoneslurryisaddedwithinorganicsaltsuchasNa2SO4andMgSO4,etc.,andthesolubilityofCaCO3intheslurryismeasured.TheresultshowsthatNa2SO4andMgSO4canbothincreasethesolubilityofCaCO3,andtheeffectofNa2SO4isbetter.Thesulfuricacidistitratedintheslurrythroughanadvectionpumpandthedissolutionrateoflimestoneismeasuredindifferentslurry.Theresultshowsthattheexistenceof0105molPLpotassiumcitrategeneratescitrateacidintheslurry,whichcanincreasethedissolutionrateofCaCO3andenhancethebufferingcapacityoftheslurry.Thesimulatedfluegas,mainlyconsistingofN2andSO2withdifferentproportions(massconcentrationofSO2is20003000mgPm3),passesthroughtheslurrywithinorganicadditives.TheinfluencesoftheslurrysinitialpH,ventilatingtimeandcompositionofslurryontheadsorptionrateofSO2arestudied.Theresultshowsthattheexistenceof0105molPLNa2SO4andMgSO4canenforcethedissolutionoflimestoneandtheadsorptionofSO2,andcanalsoenhancethebufferingcapacityoftheslurry.Keywords:wetFGD;additive;dissolutionrate;pH(FGD).CaCO3,.,P,,,SO2,,[12].,FGD,.Rochelle[2],pH,,.NaohikoUkawa[34],pH.Frandsen[5],pHCaCO3,CaCO3.[6],Na2SO4,MgSO4,,,pH,.,Na2SO4,MgSO4..SO2pH,pH.191ResearchofEnvironmentalSciencesVol.19,No.1,20061111CaCO3,,,pHpH,,pH.:H2SO4+CaCO3CaSO42H2O+CO2(1):Fcdt=rVdt+Vdc+cdV(2),F,LPh;c,molPL;V,L;cH2SO4,molPL.CaCO3:r=(Fc)PV(3),cV;FpH512H2SO4.112SO2SO21,N2SO2,2,(SO2)(20003000mgPm3).1,(SO2).,.,.,SO2,,(SO2).1SO2Fig.1SchematicdiagramofmeasuringtheadsorptionrateofSO2,(SO2),SO2.(SO2)c1,(SO2)c2,SO2:RSO2=[c1P(c1+c2)]100%2211CaCO3CaCO3,CaCO3.EDTACa2+,,,.CaCO3Ca2+,2.,Na2SO4MgSO4.2Fig.2Theinfluenceofdifferentadditivesonthelimestonessolubility2:0110molPLNa2SO4,CaCO33,0115molPLNa2SO4,,CaCO3;MgSO401100120molPLCaCO3.,CaCO3,Na2SO4MgSO4CaCO3;,.CaCO3,,CaCO3.212CaCO3(Na2SO4,MgSO4,NaCl),,0105molPL,410gCaCO3,5gCaSO4,,pH512.3,pH.CaCO3,0419CaCO3,1.3pHFig.3ThechangesofpHondifferentadditives1CaCO3Table1ThedissolutionrateofCaCO3measurementNa2SO4MgSO4NaClr0.0570.099750.08550.071250.15681,CaCO3,,.:Na2SO4MgSO4,;,,pH,CaCO3.,CaCO3,.213SO22.3.1pH4,pHSO2.,pHSO2,pH.5SO2.5,5min,SO295%,SO2,,;15min,SO2,,SO2.2.3.2CaCO3SO2,6,7.6,CaCO3SO2,011g,.m(CaCO3)0125g,SO24pHSO2Fig.4TheinfluenceofinitialpHonadsorptionrateofSO25SO2Fig.5TheinfluenceofventilationtimeonadsorptionrateofSO26CaCO3SO2Fig.6TheinfluenceofCaCO3onadsorptionrateofSO27SO2Fig.7TheinfluenceofadditiveonadsorptionrateofSO279%,,SO2.7Na2SO4MgSO4SO2.7,Na2SO4MgSO4.Na2SO4.141:m(Na2SO4)118g,,SO292%,Na2SO4,Na2SO4,.Na2SO4,MgSO4.m(MgSO4)214g.Na2SO4MgSO4,c(SO42-)0105molPL,SO2,SO42-,SO42-SO2.,pH.,Na2SO4MgSO4,0105molPL,pHpH,pH,8.8pHFig.8TheinfluenceofadditiveontheslurryspH8,MgSO4Na2SO4,pH,pH.Na2SO4MgSO4pH,SO2,.3a.CaCO3,.,,CaCO3,.b.pHSO2,.,15min,SO2.c.SO2,.,c(Na2SO4)c(MgSO4)0105molPL,,SO2,Na2SO4MgSO4,SO2.d.Na2SO4MgSO4,SO42-,SO42-,Na2SO4MgSO4,SO2.:[1]HenzelDS,LasekeBA.Handbookforfluegasdesulfurizationscrubbingwithlimestone[M].ParkRidge,NewJersey:NoyesDataCorporation,1982.[2]RochelleGaryT,KingCJudson.TheeffectofadditivesonmasstransferinCaCO3orCaOslurryofSO2fromwastegases[J].IndEngChemFundam,1977,16(1):6775.[3]NaohikoUkawa,ToruTakashina.Effectofsaltsonlimestonedissolutionrateinwetlimestonefluegasdesulfurization[J].EnvironProgr,1993,12(4):294299.[4]NaohikoUkawa,ToruTakashina.EffectofparticlesizedistributiononlimestonedissolutioninwetFGDprocessapplications[J].EnvironProgr,1993,12(3):238242.[5]FrandsenJanBW,KiilSoren.OptimisationofawetFGDpilotplantusingfinelimestoneandorganicacids[J].ChemicalEngineeringScience,2001,56(10):32753287.[6],.P[J].,1995,15(6):438442.WuZhongbiao,TanTianen.StudiesonadditiveofwetFGDwithlimelimestone[J].ChinaEnvironmentalScience,1995,15(6):438442.(:)2419