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1、Chemosphere68(2007)330–337www.elsevier.com/locate/chemosphereVOCdestructionbywaterdilutedhydrogenmildcombustiona,bbc,*bP.Sabia,F.Romeo,M.deJoannon,A.CavaliereaCIRPS-Universita`‘‘LaSapienza’’,Roma,ItalybDipartimentodiIngegneriaChimica,Universita`FedericoII,Naples,ItalycIstitutodiRicerc
2、hesullaCombustione,C.N.R.,Naples,ItalyReceived13July2006;receivedinrevisedform11December2006;accepted17December2006Availableonline6February2007AbstractThisstudyrepresentsapreliminarynumericalevaluationoftheeffectofsteamdilutionandhydrogenadditionontheoxidationofformaldehydeandbenzene,c
3、hosenasrepresentativeofthevolatileorganiccompounds(VOC),inmildconditionbyevaluatingtheautoignitiontimeandthesteadystateattainment.TheseparametersareimportantinthedesignofthermalVOCdestructionplantssincetheyinfluencetheabatementefficiencyand,therefore,theplantdimension.Ithascomeoutthat,in
4、comparisonwiththesystemdilutedinnitrogen,steaminduceslowerautoignitiontimesand,ontheotherhand,longertimesfortheattainmentofthesteadystate.Incontrast,forveryhighwatercontenttheautoignitiontimeslightlyincreases.Inparticularresultshaveshownthatispossibletoidentifyanoptimumvalueofsteamcon
5、tentthatallowsfortheattainmentofthesteadystateconditionbythelowestresidencetime.Hydrogenadditiontosystemsdilutedinnitrogenpromotestheoxidationreactionsandanticipatesthesteadystatecondition.Insteamdilutedsystemshydrogendelaystheautoignitionofthemixtureseventhoughanticipatestheattainmen
6、tofthecompletedestruc-tionoftheVOC.TherateofproductionanalysishasshowedthattheH2/O2reactions,thatpromotetheignitionandthedestructionofVOC,aresen-siblymodifiedbythepresenceofwaterandhydrogen.Ó2007ElsevierLtd.Allrightsreserved.Keywords:Formaldehydeoxidation;Benzeneoxidation;Steamdilution
7、;Hydrogenaddition1.Introductionbustionchambertemperaturesinthermaloxidationdevicesrangefrom950Kupto1100K.CoupledwiththerequiredThermaldestructionofvolatileorganiccompoundsinletVOCconcentrations,fixedat25%or50%ofthelow(VOC)isamaturetechnology,largelyappliedincasetheflammabilitylimitaccor
8、dingt
