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汽轮机组中压内缸螺栓断裂原因分析.docx

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汽轮机组中压内缸螺栓断裂原因分析 Title:AnalysisoftheCausesofBoltFractureintheIntermediatePressureCylinderofaSteamTurbine Abstract: Steamturbineunitsarecrucialforvariousindustrialapplications,providingpowergenerationandmechanicaldrivecapabilities.However,theyaresusceptibletomechanicalfailures,suchasboltfractureintheintermediatepressurecylinder,whichcanleadtoseriousoperationaldisruptionsandsafetyhazards.Thispaperaimstoanalyzeanddiscussthepotentialfactorscontributingtoboltfractureintheintermediatepressurecylinderofasteamturbineunit.Byunderstandingthesecauses,appropriatepreventionmethodscanbeimplementedtoensurereliableandsafeturbineoperation. 1.Introduction: 1.1ImportanceoftheIntermediatePressureCylinder: Theintermediatepressurecylinder(IPC)playsacriticalroleinthefunctionalityandefficiencyofsteamturbineunits.Itoperatesunderhighpressureandtemperatureconditions,experiencingsignificantmechanicalstressesandvibrationsduetotheexpansionandcontractioncyclesduringoperation. 1.2SignificanceofStudyingBoltFracture: BoltfractureintheIPCisacommonissuethataffectstheperformanceandreliabilityofsteamturbines.Identifyingthecausesofsuchfailuresiscrucialfordesigningeffectivemaintenancestrategiestopreventcatastrophicconsequences. 2.MaterialPropertiesandStressAnalysis: 2.1BoltMaterialSelection: ThematerialselectionforboltsintheIPCisessentialforensuringsufficientstrength,ductility,andresistancetoelevatedtemperaturecreep.Commonmaterialsincludealloysteels,stainlesssteels,andtitaniumalloys. 2.2StressAnalysis: Stressanalysisshouldbeconductedtodeterminethemaximumstressesandpotentialfailureareaswithintheboltedconnections.Finiteelementanalysis(FEA)canprovidevaluableinsightsintostressdistribution,consideringthecomplexloadingconditionsduringoperation. 3.FactorsContributingtoBoltFracture: 3.1Overloading: Excessivestressontheboltsduetooverloadconditionsorexcessivetighteningtorquecanleadtofatiguefailure.Overloadingcanresultfromsuddenloadvariations,abnormaloperatingconditions,orsystemmalfunctions. 3.2High-TemperatureEffec