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15MW汽轮机组大修后转速飞升的原因分析与处理.docx

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15MW汽轮机组大修后转速飞升的原因分析与处理 Title:AnalysisandHandlingofSpeedSurgeafterOverhaulofa15MWSteamTurbineUnit Abstract: Theoccurrenceofspeedsurgeina15MWsteamturbineunitafteroverhaulcanleadtodetrimentaleffects,resultinginpotentialdamagetothemachineryandcompromisingtheoverallstabilityofthesystem.Therefore,inthispaper,weaimtoanalyzethecausesofspeedsurgeandprovideeffectivestrategiesforitshandling.Byexaminingpotentialissuessuchasimbalancesinrotorcomponentsandimproperadjustmentofcontroldevices,wecanbetterunderstandtheunderlyingfactorsandimplementappropriatesolutionstopreventspeedsurge. 1.Introduction: Speedsurge,characterizedbyasuddenanduncontrollableincreaseinrotationalspeed,isacriticalissueinturbinesystems.Theaftereffectsofaspeedsurgecanrangefromincreasedmechanicalstressonturbinecomponentstocompletefailureoftheunit,riskinghumansafetyandeconomiclosses.Therefore,itiscrucialtoanalyzethecausesofspeedsurgeanddevelopeffectiveapproachestomitigateitsoccurrence. 2.CausesofSpeedSurge: 2.1ImbalancesinRotatingComponents: Oneofthemajorcausesofspeedsurgeisthepresenceofimbalancesintherotatingcomponentsoftheturbineunit.Minutechangesinthemassdistributionoftherotorelements,suchasturbinebladesortherotordisk,canintroduceunevenforcesduringoperation.Theseimbalancesleadtoanincreaseinvibrationlevels,triggeringspeedsurge.Identifyingunbalancedcomponentsthroughvibrationanalysisanddynamicbalancingtechniquesiscrucialduringtheoverhaulprocess. 2.2ControlDeviceAdjustments: Improperadjustmentofcontroldevicescanresultinspeedsurgeafterthecompletionofaturbineunitoverhaul.Variouscontroldevices,suchasgovernorvalvesandnozzlecontrolvalves,regulatetheflowofsteamandcontrolturbinespeed.Incorrectlycalibratedcontroldevicescancausesuddenfluctuationsinsteamflow,leadingtoanuncontrolledincreaseinrotationalspeed. 2.3BearingandLubricationIssues: Faultybearingsorinadequatelubricationcanalsocontributetospeedsurgefollowingaturbineunitoverhaul.Wearandtearofbearingscanleadtoincreasedfriction,causingirregularitiesintheturbine'srotational