飞灰石灰吸着剂制备及其脱硫脱硝性能的研究钱枫

32/100037、、。/、、。。/97.55m2/g10～100///1/1/40m2/g250～270A觷。X701A1003-6504(2009)02-0056-04PerformanceofFlyAsh/LimeSorbentsforSimultaneousRemovingSO2andNOXfromFlueGasQIANFengQIUXiao-pengLIXiao-yanSchoolofChemicalandEnvironmentalEngineeringBeijingTechnologyandBusinessUniversityBeijing100037ChinaAbstractSorbentswerepreparedwithflyashandlimeinhydrationwithdiscussionofcharacteristicsinspecificsurfaceandporestructureofsorbentsandtheirperformanceindesulfurizationanddenitrification.Conditionsofhydrationsuchasratioofflyashtolimehydrationtimeandhydrationpressurewereinvestigatedresultsshowedthatspecificsurfaceareaandporevolumeofsorbentsweremuchlargerthanthatofflyashorlimeasmaterials.Specificsurfaceareaofsorbentswascloseto97.55m2/gatthemostandporevolumeincreased10～100times.Ratioofflyashandlimehadimportantinfluencewithattributeofmacrostructure.Resultsshowedthatwhenratioofflyashandlimewas1to1orthespecificareawaslargerthan40m2/gmedianporediameterwasabout250～270Athesorbentshadbettereffectofdesulfurizationanddenitrification.Keywordsflyashlimedesulfurizationanddenitrificationspecificsurfaceandporestructure、。。、、[1-3][4]/。。11.11.1.11。CaOCaCO3。105℃2h150850℃30minCaCO3CaOCaO98.2%。2。GB/T1574-19951。3。2。[e-mail]。EnvironmentalScience&Technology32220092Vol.32No.2Feb.20091Table1Thechemicalconstituentsofflyash(%)SiO2Al2O3Fe2O3CaOMgOLoss(%)43.129.413.94.41.37.921.1.2。105℃100、。、、/、、。。1.2N2ASAP2010-M。1.31.3.1。。SO2NOX90%10%。SO2NOX。1.3.21。60～80。22.1SO21800mg/m3、NOX400mg/m3、O212%、N260%。70℃、1L/min。3。8～920%20%～60%。。2.2/。、、/4～6。。11.83.32m2/g/97.55m2/g10～100。2Table2Thephysicalpropertiesofflyash(g/cm3)(m2/g)(cm3/g)(魡)0.43411.840.02652410.5973.320.002671913Table3Thecharacteristicsoflimeandflyash(m2/g)11.8493.503.324.39(cm3/g)0.02650.18430.002670.0045(魡)241162.1191222.5(%)61.8274.126.176.62(%)21.7926.806.276.444Table4Thespecificsurfaceandporestructureofthesorbents(m2/g)(cm3/g)(魡)(℃)/251/478.890.1545173.21/268.270.1330175.11/156.290.1095175.22/139.820.0705173.74/126.570.0427166.8901/488.100.1807199.11/282.090.1677204.91/174.710.1518227.82/154.120.1006213.44/139.370.0686175.5/57324～6//、、/。/1/1。70m2/g100魡。/2/1～4/1。。。/。。2.3/2.3.125℃90℃/7。//。。4、7/1/190℃20m2/g25%0.152cm3/g、。//、。40m2/g、。。79.68%36.75%25%66%。2.3.28。/。/1/1/0.8MPa。5Table5Thespecificsurfaceandporestructureofthesorbents(m2/g)(cm3/g)/(魡)/(MPa)1/40.484.730.1770199.50.885.290.1799221.81.286.040.1748217.91.687.110.1728204.11/20.476.480.1577226.40.878.120.1627244.71.278.330.1573224.81.680.420.1577219.61/10.460.720.1230254.90.862.630.1289275.11.265.970.1322239.01.672.110.1407231.52/10.445.710.0876230.20.846.830.0914265.71.248.130.0935248.71.654.930.1044223.24/10.428.710.0547230.80.829.870.0582247.51.229.940.0570226.61.633.440.0613212.76Table6Thespecificsurfaceandporestructureofthesorbents(m2/g)(cm3/g)/(魡)/(MPa)1/40.497.550.2029208.10.895.310.1990216.31.287.310.1864232.71.683.450.1677221.41/20.493.90.1938230.00.892.390.1903240.71.283.080.1759254.61.678.470.1555234.81/10.476.110.1544256.00.875.150.1534259.41.273.230.1528277.21.670.040.1377273.02/10.449.250.0942215.70.848.630.0938219.01.245.670.0902236.71.644.950.0862225.64/10.434.990.0645196.00.834.690.0664214.21.233.550.0653224.31.629.840.0562209.17Table7Thedesulfurationanddenitrificationperformanceofthesorbents(℃)2590/ηSO2(%)ηNOX(%)ηSO2(%)ηNOX(%)1/467.025.071.832.81/269.525.873.5834.41/169.528.779.736.82/153.627.977.834.94/144.926.457.331.958282.26%37.79%。33%73%。2.3.3/1/11.2MPa。82.40%38.34%。33%76%。9。8Table8Thedesulfurationanddenitrificationperformanceofthesorbents(MPa)0.40.81.21.6/ηSO2(%)ηNOX(%)ηSO2(%)ηNOX(%)ηSO2(%)ηNOX(%)ηSO2(%)ηNOX(%)1/467.431.569.131.267.230.567.228.81/269.031.571.633.961.130.069.331.61/176.435.882.337.877.837.280.337.52/172.436.377.236.675.836.073.833.74/164.131.572.934.171.123.867.027.19Table9Thedesulfurationanddenitrificationperformanceofthesorbents(MPa)0.40.81.21.6/ηSO2(%)ηNOX(%)ηSO2(%)ηNOX(%)ηSO2(%)ηNOX(%)ηSO2(%)ηNOX(%)1/465.931.862.231.473.733.968.331.21/269.434.673.936.874.236.366.033.21/177.736.080.537.682.438.376.936.62/171.832.874.333.376.536.073.633.04/165.226.568.729.070.933.063.424.0、。SO2[5-6][7]。≥40m2/g250～270魡。31//。/97.55m2/g10～100100魡。2//。。3//1/1。。4、。。/40m2/g250～270魡。。[][1]TsuchiaiHIshizukaTUenoTetal.Studyoffluegasdesulfurizationabsorbentfromcoalflyasheffectofthecompositionoftheabsorbentontheactivity[J].IndEngChemRes1996352322-2326.[2]TsuchiaiHIshizukaTUenoTetal.Highlyactiveab－sorbentforSO2removalpreparedfromcoalflyash[J].IndEngChemRes1995341404-1411.[3].[J].199816530-33.LuYong-qi.Experimentalstudyonenhancementofcalci－umbasedsorbentsreactivitywithSO2[J].EnvironmentalEn－gineering199816530-33.inChinese[4].[J].2000,16433-35.ZhaoJian-haiZhaoYi.ExperimentalstudyonabsorbentforSO2removalpreparefromcoalflyash[J].InformationonElectricPower2000,16433-35.inChinese[5]DiffenbachRAHiltermanMJFrommellEA.Character－izationofcalciumoxide-flyashsorbentsforSO2removal[J].ThermochimActa199118911-27.[6]SimonsGAGarmanAR.Smallporeclosureandthede－activationofthelimestonesulfationreaction[J].ArcheJ