低成本去除电弧炉废气中二恶英的方案

39120041IRONANDSTEELVol.39,No.1January2004J.LehnerA.Friedacher()()L.GouldW.Fingerhut()2090,LOW-COSTSOLUTIONSFORTHEREMOVALOFDIOXINFROMEAFOFFGASJ.Lehner(TechnicalOfficeforProcessandEnvironmentalEngineering,LinzöAustria)A.Friedacher(LeobenUniversityofMiningandMetallurgy,LeobenöAustria)L.GouldW.Fingerhut(VOEST2ALPINEIndustrieanlagenbauGmbH&Co(VAI),LinzöAustria)ABSTRACTTheironandsteelindustryisunderconsiderablepressuretocontinuouslyreducethelevelsofgenerateddioxinsandotherharmfulemissionsfromprocessoffgas.Intheearly1990sVAIcommencedwiththeinvestigationofnewoffgascleaningsystemsforsinterplantsandelectricarcfurnaces(EAF)whichresultedinaconsiderablyimprovedoffgas2cleaningefficiency.Thispaperoutlinesthetechnologicalsolutionsofthenewlydevelopedgas2treatmentsystemsandapplicationresultsinthesteelindustry.KEYWORDSdioxin,EAF,offgas,environmentalprotection1,(),(1),,,200600,250400,2:,,(100004)718B8B10,(3),,200,31PCDDFig11VaporpressureofPCDD2Fig12Temperature2dependentgenerationofdioxin:(1)850,;(2)600200,;(3),ö2,(4),(3Fig13Temperaturerangeofdenovosynthesis)211,46391000CO,,VOC,(3),4Fig14ModularEAFoffgassystem,,(850),212,600,200,,,213,,()214,215,,,adsorbentinjectionunit216,ö,,,,217,(),,3,33112000,,,apulse2jettypefilter561J.Lehner:31220012002,(2001)(2002),313,5(a)(b),,45,,01040106ngI2TEQöm3,,,,011ngI2TEQöm35Fig15DioxinbalanceofEAFoffgassystems(a)();(b)()6Fig16Adsorptionefficienciesasafunctionoffiltertemperatureandadsorptioninjection4,(),80(6),(),6639