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300MW机组低压缸端汽封优化改造研究及应用.docx

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300MW机组低压缸端汽封优化改造研究及应用 Abstract Theoptimizationandrenovationofthelow-pressurecylinderendsteamsealofthe300MWunitisanecessaryprojectforthecontinuousandstableoperationofthermalpowerplants.Theshortcomingsoftheoriginalsealhaveresultedinhighleakage,decreasedefficiency,andincreasedmaintenancecosts.Inthisstudy,weconductedacomprehensiveanalysisoftheoriginalsteamsealsystemandproposedanewsealdesign.Therenovationincludedsealingmaterialupgrades,structuralimprovements,andsystemadjustments,aimedateliminatingsourcesofleakageandimprovingsystemefficiency.Theresultsshowedthatthenewdesignsignificantlyreducedleakageandimprovedoverallplantperformance. Introduction Steamturbinesarethebackboneofmodernthermalpowerplants,andthestabilityandefficiencyoftheturbinedependonthesealingsystem.Thelow-pressurecylinderendsealofa300MWunitisthefinalstageofsteamentryintothecondenser,playingavitalroleinmaintainingthepressureandtemperatureofthesteamandpreventingsteamleakage.However,intheoriginaldesignoftheseal,leakageoccurredfrequently,leadingtoproductionloss,decreasedefficiency,andincreasedmaintenancecosts. Inresponse,weconductedacomprehensivestudyontheoriginalsteamsealsystemandproposedrenovationmeasures.Therenovationaimedtoimprovetheseal'ssealingperformance,eliminatesourcesofleakage,andimprovetheoverallplantefficiency,whileminimizingoperationandmaintenancecosts. AnalysisoftheOriginalSteamSealSystem Theoriginalsteamsealofthe300MWunitincludedtwolabyrinthsealringsandonecarbonbrushsealring.Thelabyrinthsealringswerelocatedontherotors,whilethecarbonbrushsealwasinstalledinthestator.Themaincomponentsoftheoriginalsteamsealsystemincludedstationarycomponents,rotatingcomponents,sealingmaterials,andauxiliaryequipment. Themainshortcomingsoftheoriginalsteamsealwereahighleakagerate,lowefficiency,andfrequentmaintenancerequirements.Thecarbonbrushsealhadthemostsignificantimpactontheseal'sperformance,asitwaspronetowearandoverheating,resultinginreducedsealingperformanceandhigherleakagerates. RenovationMeasures Toimprovethesea