浅谈复合硅酸盐保温材料在蒸汽管道保温中的应用.doc

http://www.lcjcgy.com/
http://www.zgjggs.com/

浅谈复合硅酸盐保温材料在蒸汽管道保温中的应用
摘要对电厂主蒸汽管道外表面温度超标现象进行分析，提出改造技术方案及施工工艺要求，介绍复合硅酸盐保温材料在蒸汽管道节能改造中的成功应用。
Picktoexceedthephenomenonofpowerplantmainsteampipeoutsidesurfacetemperaturewereanalyzed,andputforwardreformrequirements,technicalschemeandconstructiontechnologyofcompositesilicateinsulationmaterialsinenergysavingrenovationthesuccessfulapplicationofsteampipeline.
关键词汽管道保温节能环保应用
Keywordssteampipelineinsulationsectiontoenvironmentalapplications
一、改造前保温存在的问题电厂12MW次高温次高压机组主蒸汽管道，原设计保温材料是硬质成型微孔硅酸钙，在运行中由于机组启、停时管道产生热位移，交变挤压；管道的轻微震动；长期高温使用等原因，造成硅酸钙碎裂粉化，形成很多裂缝，保温材料的热密封性能下降，蒸汽管道热能容易向外散发。同时保温材料塌陷出现空洞，特别是在水平管与垂直管段交接的弯头处出现脱节，保温效果很不理想，外表面温度平均55℃，局部温度高达150℃以上，散热损失较大。
Thetransformationbeforeinsulation,theproblemsexistinginthepowerplant12mwtimehightemperatureandhighpressuremainsteampipeunit,theoriginaldesignishardshapedmicroporouscalciumsilicateinsulatingmaterialandintheoperationofthethermaldisplacementduetopipeunitstart-upandstoppingtime,alternatingextrusion;Pipingvibrations;Duetolong-termuseinhightemperaturecalciumsilicatecataclasticpulverization,formingmanycracks,heatsealingperformanceofinsulationmaterials,steampipeheattosendouteasily.Insulationfailuresappearedemptyatthesametime,especiallyinhorizontaltubeandverticalsectiondisconnectatelbow,heatpreservationeffectisnotveryideal,outsidesurfacetemperatureof55℃,anaveragelocaltemperatureashighas150℃above,heatlossisbigger.
按GB4272－92《设备及管道保温技术通则》，在设备或管道外表面采取保温措施后，其保温层外表面温度必须小于50℃的规定，外表面温度已经超标。因此，节能降耗工作成为需要解决的当务之急，同时管道的保温节能改造既是技术的需要，是企业管理的重要内容，也是节能降耗的重要途径，因此电厂于2005年对1#、2#机组主蒸汽管道进行了保温节能改造。
AccordingtoGB4272-92"generalprinciplesforequipmentandpipeheatpreservationtechnology,theequipmentorpipeoutersurfaceheatpreservationmeasures,theinsulationmustbesmallerthantheoutersurfacetemperatureof50℃,outsidesurfacetemperaturehasbeenoverweight.Therefore,becometheprioritiesofenergyconservationandconsumptionreduction,energysavingrenovationisbothatthesametime,pipeinsulationtechnologyneeds,istheimportantcontentofenterpr