预览加载中，请您耐心等待几秒...

350MW超临界锅炉螺旋水冷壁壁温特性研究.docx

预览
1/3
2/3
3/3

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

350MW超临界锅炉螺旋水冷壁壁温特性研究 Abstract Supercriticalboilersarewidelyusedinmodernpowergenerationduetotheirhighthermalefficiencyandlowemissions.Thespiralwater-cooledwallisanimportantcomponentofthesupercriticalboiler,whichplaysanimportantroleinheattransferandhydraulicperformance.Inthispaper,weinvestigatethewalltemperaturecharacteristicsofa350MWsupercriticalboilerwithaspiralwater-cooledwall.Throughnumericalsimulationandexperimentalanalysis,wefindthatthewalltemperaturedistributioniscloselyrelatedtotheflowrateandthewallstructure.Theresultsofthisstudyprovideusefulguidanceforthedesignandoptimizationofsupercriticalboilers. Introduction Supercriticalboilers,whichoperateatpressuresabovethecriticalpointofwater,havebecomethedominanttechnologyformodernpowergenerationduetotheirhighthermalefficiencyandlowemissions.Inasupercriticalboiler,theheattransferfromthefluegastothewateroccursmainlythroughthewater-cooledwalls,whichconsistoftubesthroughwhichwatercirculates.Amongvarioustypesofwater-cooledwalls,thespiralwater-cooledwallhasbeenwidelyusedinrecentyearsduetoitsgoodheattransferperformanceandhydrauliccharacteristics. Thespiralwater-cooledwallconsistsofaspiraltube,anupperheader,alowerheader,andasetofconnectingpipes.Thefluegasflowsovertheoutsideofthespiraltubewhilewaterflowsinsidethetube.Thespiraltubeisdesignedtoincreasetheheattransferareaandenhancetheturbulentflowofwater,therebyimprovingtheheattransferefficiency.Theupperandlowerheadersdistributethewatertothespiraltubeandcollecttheheatedwater,respectively.Theconnectingpipesconnectthespiraltubetotheheaderstoensuresmoothflowofwater. Oneofthekeyfactorsthataffecttheperformanceofthespiralwater-cooledwallisthewalltemperaturedistribution.Thewalltemperatureaffectstheheattransferefficiencyandthethermalstressofthewall,whichinturnaffectsthesafetyandreliabilityofthesupercriticalboiler.Inthispaper,weinvestigatethewalltemperaturecharacteristicsofa350MWsupercriticalboilerwithaspiralwater-cooledwall. NumericalSimulation Tosimulatethewalltemperaturedistributiono