抑制氮氧化物排放的无烟燃煤技术及其在窑炉改造中的应用

11Vol.1No.120011TheChineseJournalofProcessEngineeringJan.2001,,,,,(,100080):NONO,..:;;;:TK16:A:1009−606X(2001)01−0095−041.(NOx).[1]..NONO60%[2].NO(COH2CmHnNH3HCN)NO[3]NO.CmHnCmHn.CmHn[4].CmHnCmHn...2158kW3.12452461999−11−051999−12−29(:29876044)(1962−).96132164571.Primaryair2.Auxiliaryair3.Pyrolysischamber4.Feedingdoor5.Combustionchamber6.Fender7.Chimney2345.64.NO,NO2,CO,O2MSI.1.1Fig.1Sketchofthetestingstove1Table1UltimateandproximateanalysesofcoalCad(%)Had(%)Oad(%)Nad(%)Sad(%)Mad(%)Aad(%)Qnet,ad(kJ/kg)71.483.957.590.820.482.1513.5428517.22.162.0∼10,20∼30min10∼20,30∼60min.2NO25mg/Nm330%CO2500mg/Nm3.12∼4200oC.02040608010012001000200030004000CO(mg/Nm3)Time(min)020406080100120050100150200250NO(mg/Nm3)010203040506001000200030004000CO(mg/Nm3)Time(min)0102030405060050100150200250NO(mg/Nm3)2NO3NOFig.2ComparisonofemissionlevelsinconventionalFig.3ComparisonofemissionlevelsindowndraftmodeandNOdepressedcombustion(O2=7%)andNOdepressedmodeofcombustion(O2=7%)2.243.20∼40,58∼78,88∼118min0∼20,40∼58,78∼88min.NO50mg/Nm3,40%CO2000mg/Nm3,.NO,CO.19733.1464kW2..1m,1m,1.4m.2∼4.2Table2UltimateandproximateanalysesofcoalCad(%)Had(%)Oad(%)Nad(%)Sad(%)Mad(%)Aad(%)Qnet,ad(kJ/kg)50.023.809.810.741.008.0026.63197173.2.4....3Table3EmissionfrommodifiedandunmodifiedkilnModifiedkilnOriginalkilnExcessiveair1.71.7Dustcon.(mg/Nm3)10.2833.87Dustemission(kg/h)0.010.07Ringelmannindex123.33,4,56.(a)Unmodified(b)Modified4Fig.4Configurationofkiln45min.NO254171mg/Nm3110116mg/Nm3CO343007186mg/Nm320211153mg/Nm3.4Table4ThermalefficiencyCoal(kg/d)CO(mg/N3)Ash(kg/d)Cinash(%)Cinslag(%)Thermalefficiency(%)Originalkiln21002021558.619.3411.6890Modifiedkiln1850115347811.185.4696NONONO3h981NO6150min.25minNO,.100minNO131mg/Nm325minNO151mg/Nm3.1200°C200°CNO32%NO.CO,COCO,CO..6%.050100150200250050001000015000200002500030000CO(mg/Nm3)Time(min)050100150200250050100150200250NO(mg/Nm3)050100150200250050001000015000200002500030000CO(mg/Nm3)Time(min)050100150200250050100150200250NO(mg/Nm3)56Fig.5EmissionsfromunmodifiedkilnFig.6Emissionsfromthemodifiedkiln4(1)NO.(2).(3)6%.:[1],,,.NOx[P].CH110776A1998−04−23.[2].[M].:,1992.46.[3]KramlichJC,ColeJA.MechanismsofNitrousOxideFormationinCoalFlames[J].CombustionandFlume,1989,77(4):375−384.[4]SantoroRJ,SemerjianHG.TwentiethSymposiumonCombustion[A].TheCombustionInstitute.Pittsburgh.1990.997NOx-suppressedSmokelessCombustionTechniqueandApplicationinCoal-firedKilnsXUYou-ning,SONGWen-li,BAIYun-ru,ZHANGJian-guo,LINWei-gang,LIJing-hai(InstituteofChemicalMetallurgy,ChineseAcademyofSciences,Beijing100080,China)Abstract:MechanismanalysisandemissionmeasurementindicatethattheNOx-suppressedsmokelesscoalcombustiontechniquecanreduceNOandsmokeemissionsimultaneouslyandimprovecombustionefficiency.Itsapplicationtocoal-firedkilnsispresentedbycomparingtheemissionfromthemodifiedandunmodifiedkilns.Keywords:kiln;nitrogenoxide;carbonmono-oxide;soot