Experimental study on the influence of the thermal input on the reaction zone under

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1、FuelProcessingTechnology106(2013)423–428ContentslistsavailableatSciVerseScienceDirectFuelProcessingTechnologyjournalhomepage:www.elsevier.com/locate/fuprocExperimentalstudyontheinfluenceofthethermalinputonthereactionzoneunderflamelessoxidationconditionsA.S.Veríssimo,A.M.A.Rocha,M.Costa⁎MechanicalEn

2、gineeringDepartment,InstitutoSuperiorTécnico,TechnicalUniversityofLisbon,AvenidaRoviscoPais,1049–001Lisboa,PortugalarticleinfoabstractArticlehistory:Thereactionzoneofasmall-scalelaboratorycombustoroperatingunderflamelessoxidationconditionsisReceived18June2012examinedwiththeaidofhydroxylradicalchem

3、iluminescence(OH*)imagingandmeasurementsoflocalReceivedinrevisedform30July2012meangastemperaturesandlocalmeanmajorgasspecies(O2,CO2,CO,unburnthydrocarbonsandNOx)con-Accepted4September2012centrationsalongthecombustoraxis,asafunctionofthefuel(methane)thermalinput,whichwasvariedAvailableonline28Sept

4、ember2012between7and13kW.Asthefuelthermalinputincreases,thereactionzone,astypifiedbytheOH*distribu-tion,enlargesand,simultaneously,movesprogressivelyclosertothecombustorexit(exhaust)duetotheKeywords:experimentalincreaseinthecentraljetmomentum,whilemaintainingconstanttheexcessairlevel.Theexcessairv

5、alueslaboratorycombustorusedinthepresentstudywerelowenoughtopreservetheflamelesscombustionregimeregardlessoftheflamelessoxidationfuelthermalinput,withthecombustoryieldingverylowNOx(b6ppm@15%O2)andCOemissionsreactionzonestructure(b14ppm@15%O2)regardlessofthefuelthermalinput.ThelowNOxemissions,almost

6、independentofhydroxylradicalchemiluminescencethefuelthermalinput,areattributedtothesuppressionofthethermalmechanismpromotedbythepollutantemissionsflamelessoxidationregime.Despitebeingalwayslow,theCOemissionsincreasewiththefuelthermalinputpresumablybecauseofthelowerresidencetimesassociatedwiththehi

7、gherburnerthermalloads.PublishedbyElsevierB.V.1.Introductionproductioninconfinedpropaneandethyleneflameswithfluegasrecirculation[18],andHardalupasetal.indicatedthatintensitiesofNearlytwodecadesago,anewcombustionmode,known