连续退火炉余热回收技术应用与节能方案

20092连续退火炉余热回收技术应用与节能方案王鲁,王家真(宝钢新日铁汽车板有限公司,上海200941):冷轧带钢连续退火炉机组排烟温度高耗能大是普遍存在的问题为了提供一些退火炉节能降耗技术方面的参考方案,以宝钢四冷轧为分析对象,对冷轧带钢连续退火炉的几种余热回收方式进行了比较,并讨论了各种余热回收形式的优缺点,认为过热水回收技术是比较便捷的余热回收方式,并通过分析一个热平衡测试实例,找出余热回收以外的几种在退火炉本体可以实施的节能方法:连续退火炉;余热回收;节能技术:TG155.1:B:1008-0716(2009)02-0070-05ApplicationofResidualHeatRecoveryTechnologyoftheContinuousAnnealingFurnaceandtheEnergysavingSchemesWANGLuandWANGJiazhen(BaosteelNSC/AcelorAutomotiveSteelSheetsCo.,Ltd.,Shanghai200941,China)Abstract:Itisacommonproblemthatthetemperatureoffluegasesfromcoldstripannealingfurnacesishighandtheenergyconsumptionisgrea.tInordertoprovidesomeschemesforreferenceinenergysavingandconsumptionreducingforannealingfurnaces,BaosteelNo.4coldmillplantwastakenasananalyticalobjectandtheexistingresidualheatrecoverymethodsforcoldstripannealingfurnaceswerecompared.Afterstrongandweakpointsofeachmethodhadbeendiscussed,theoverhotwaterrecoverytechniquewasconsideredthemostconvenientofal.lThroughanalyzingaheatbalancesample,someotherenergysavingmethodsthatcouldbeimplementedinannealingfurnaceswerediscovered.Keywords:continuousannealingfurnace;residualheatrecovery;energysavingtechnology0,,()()14(2),,,35%~45%,[e-mail]15,1(CAPL)1#(1CGL)2#(2CGL),233EDDQ/SEDDQIF,,,,70王鲁等1Table1GeneralsituationofBaosteelannealingfurnaces1,1,1,11,2,,1,2,1,,1,2(),23Table2GeneralsituationofthreeannealingfurnacelinesinBaosteelNo.4coldstripmillCAPL1CGL2CGL/t964736/333231159COG/km3380016001350/%473239/300~350200~230180~22023,,,10%~14%2.1,,,,,;,(CAPL)1图1连退机组余热回收系统Fig.1Residualheatrecoverysystemofthecontinuousannealingline400,,,,,,,10%,7120092,,,,,,,,2.21CGL[1],2,(RTF)675,35200515,,200,,8.2t/h,4.8t/h,,,14%;,,,,,图2锅炉余热回收系统Fig.2Residualheatrecoverysystemofsteamboilers2.32CGL,3,,1.2MPa,,,90,140,,,,,,,,,,3图3过热水余热回收系统Fig.3Residualheatrecoverysystemofoverhotwater72王鲁等3Table3Comparisonofthreetypesofresidualheatrecoverysystems,,,3,,,,13%~14%,,,,,,44Table4ThetestresultsofheatbalanceonaCGLline%/(MJt-1)CQ7208096.051.911.50.93.426.313.4DQ7608916.151.311.30.93.327.220.5DDQ7809316.151.011.50.93.427.213.8DDQOUT7809265.951.412.71.03.825.114.0EDDQ7809666.150.511.60.93.427.414.1EDDQOUT7809656.050.912.41.03.725.914.3SEDDQ84010386.249.611.60.93.428.314.3SEDDQOUT84010386.250.012.01.03.627.314.5HSSCQ7508676.051.610.80.93.227.413.8HSSDQ8009616.250.711.00.93.328.014.3HSSDDQ8009656.150.711.20.93.327.814.3HSSDDQOUT8009776.050.812.61.03.725.814.3HSSBH85010556.249.611.80.93.527.914.8HSSBHOUT85010576.249.612.41.03.727.214.9()9466.249.612.71.03.826.713.6(26.7%)(12.7%),13.6%3.1,,30%,,,,,,4,,,,图4辐射管内的增强型热交换器Fig.4Enhancedheatexchangerinaradianttube350~400,650~70070~100,5%~10%7320092,5图5两种辐射管热交换器燃烧测试的对比数据Fig.5Contrastdataoftwotypesofradianttubes3.2,(12.7%),6图6传统及新型的炉墙保温棉铺设结构Fig.6Normalandnewtypesofcottonstructuresforwallinsulation6(a),[2],,6(b),,,,,,1200,7800,(b),70~80,(a),40~50图7两种炉墙保温结构炉壳温度Fig.7Temperatureoffurnaceshellwithtwokindsofwallinsulationstructures4,,,,,[1].[J].,1998,20(3):21-24.[2].[J].,2001,23(4):46-48.(:2008-07-14)74