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1、High–EfficiencyAbsorptionofHighNOxConcentrationinWaterorPEGUsingCapillaryPneumaticNebulizerPackedwithanExpandedGraphiteFilterDengxinLi*Correspondingauthor:Tel:+862167792541,Fax:+862167792522E-mailaddress:lidengxin@dhu.edu.cn(DengxinLi),PenghuiShi,JianboWa
2、ng,JiebingLi,RuijingSuCollegeofEnvironmentScienceandEngineering,DonghuaUniversity,Shanghai201620,PRChina26ABSTRACT:Nitrogenoxide(NOx)absorptioninwaterismoredifficultcomparedwithotherexhaustedgasessuchasSO2,CO2,andNH3becauseNOxhaslowwatersolubilityandnitro
3、usacidiseasilydecomposed.WedevelopedaNOxabsorptionequipmentwithacapillarypneumaticnebulizerequippedwithanexpandedgraphitedemister.Thekeyparametersofthepneumaticatomizingabsorptionsystemwereoptimized.TheselectedparametersrelatedtothehighabsorbentamountofNO
4、xareasfollows:diameterofthesprayliquidpipeof0.5?mmto1.1mm,inletgaspipeof0.5mmto1.1mmdiameterratioofthegas–liquidpipeof0.8to1.3,0.740?mofthesprayheight,MSP(minimumspraypressure)of3to4,andR(gas–liquidmassflowratio)of300.Withtheoptimalparameters,NOxremovalef
5、ficiencyandabsorbentamountarehighlyrelativetotheabsorbent,absorbenttemperature,andabsorbenttime.AhighfeedNOxgasconcentrationresultsinhighNOxremovalefficiencybecausethesurfaceareaperwater,nitricacidorpolyethyleneglycol(PEG)dropletvolumewashigherthanthatoft
6、hecommongas–liquidsurface.Fortheverificationtest,ahighNOxgasconcentration(200,000ppm)wastreatedwithaseriesofabsorptionexperimentsandaNOxremovalefficiencyof99.1%wasattained.Furthermore,usingPEGinsteadofwaterasanabsorbentresultedinalargerabsorbentamountatth
7、esameabsorbenttimeandcompleteNOxremovalinthegas.INTRODUCTIONExhaustgasesfromautomobilesandboilerscontainlownitrogenoxide(NOx)concentrations.Inmanufacturingnitricacidandmetalfinishingandindissolutionprocesses,thewastedgasescontainlargeamountsandhighconcent
8、rationsofNOx.BoththeamountandconcentrationofNOxinwastegasesmustberestrictedtolowlevelsbecauseNOxgasistoxicforhumanbeingsandcancauseacidrain.1–3ThemajorNOxcomponentsgeneratedby26fuelcombustionareNOandNO2,althoughequi
