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1、大气复习资料一、概念解释（1）Globewarming:GlobalwarmingistheincreaseintheaveragemeasuredtemperatureoftheEarth'snear-surfaceairandoceanssincethemid-twentiethcentury,anditsprojectedcontinuation.（2）VOCs:Volatileorganiccompoundsarethoseorganicliquidsorsolidswhoseroomtempe
2、raturevaporpressurearegreaterthanabout0.01psia(=0.0007atm)andwhoseatmosphericboilingpointsareuptoabout500℉,whichmeansmostorganiccompoundswithlessthan12carbonatoms.（3）Wetscrubber:Adevicethatcollectsparticlesbycontactingthedirtygasstreamwithliquiddrops.ORA
3、deviceremovesparticulatesfromagassteambybringingtheparticlesintocontactwithaliquid.Theparticlesattachtotheliquidandcanberemovedinaslurrysolution.（4）Temperatureinversions:Itisaphenomenonthatthetemperatureincreaseswiththeheightincreasing.Thatstabilityalsol
4、essenstheexchangeofwindenergybetweentheairlayernearthegroundandhighaltitudewinds.ORAtemperatureinversionsisathinlayeroftheatmospherewherethedecreaseintemperaturewithheightismuchlessthannormal.（5）ESP:Electrostaticprecipitator,whichislikeagravitysetterorce
5、ntrifugalseparator,butelectrostaticforcedrivestheparticlestothewall.Anditiseffectiveonsmallparticlesbelowabout5μmindiameter.（6）SNCR:shortof“selectivenon-catalystreduction”.Itistheprocessthatinvolvesinjectingeitherammoniaorureaintothefireboxoftheboilerata
6、locationwherethefluegasis760-1100℃(1,400and2,000°F)toreactwiththenitrogenoxides.Theresultingproductofthechemicalredoxreactioniselementalnitrogen(N2),carbondioxide(CO2),andwater(H2O).（7）SCR:shortof“selectivecatalystreduction”.Itisameansofconvertingnitroge
7、noxides(NOx),alsoreferredtoasNOxwiththeaidofacatalystintodiatomicnitrogen(N2)andwater(H2O),undertheconditionof320-400℃（600-750℉）6NO+4NH3→5N2+6H2O,4NO+4NH3+O2→4N2+6H2O,2NO2+4NH3→3N2+6H2O.（8）ThermalNO:ThermalNOxreferstoNOxformedbythesimpleheatingofoxygenan
8、dnitrogen,eitherinaflameorbysomeotherexternalheating,e.g.,alightingbot.（9）PM2.5:Particlewiththeaerodynamicdiameterlessthan2.5um,whichisalsocalledRespirableParticles.（10）Alternativefuel:Severalotherfuelsexceptofconventional
