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600MW机组冷态启动振动大原因分析和处理.docx

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600MW机组冷态启动振动大原因分析和处理 Title:AnalysisandMitigationofLargeVibrationsduringColdStart-upofa600MWUnit Abstract: Thecoldstart-upprocessofa600MWpowergenerationunitcanbechallengingduetotheoccurrenceoflargevibrations.Thesevibrationsnotonlyposeasignificantthreattothestructuralintegrityoftheequipmentbutalsoimpairtheoperationalefficiencyofthepowerplant.Thispaperaimstoanalyzethecausesbehindthesevibrationsduringthecoldstart-upofa600MWunitandproposeeffectivemitigationmeasurestominimizetheiroccurrence. 1.Introduction: Coldstart-upofapowergenerationunitinvolvesthegradualincreaseintemperatureandpressureofvariouscomponentstoachieveoperationalconditions.Duringthisprocess,largevibrationsmayoccurduetovariousfactors,includingthermalexpansion,mechanicalstress,andoperationalparameters.Itiscrucialtounderstandtheunderlyingcausesofthesevibrationsanddeviseappropriatemeasurestominimizetheirimpact. 2.CausesofLargeVibrations: 2.1ThermalExpansion:Oneoftheprimarycausesoflargevibrationsduringcoldstart-upisthedifferentialthermalexpansionbetweenvariouscomponents.Astheunitisheated,differentmaterialsexpandatdifferentrates,leadingtomechanicalstressesthatcanresultinvibrations. 2.2MechanicalStress:Theunevendistributionofmechanicalstressduringcoldstart-upcanalsoleadtolargevibrations.Factorssuchasinadequatesupportorimproperalignmentofcomponentscancreateexcessivemechanicalstress,resultinginvibrations. 2.3OperationalParameters:Impropercontrolofoperationalparameters,suchasthespeed,load,andfuelsupply,canalsocontributetolargevibrationsduringcoldstart-up.Suddenchangesintheseparameterswithoutpropercoordinationcancauseoscillationsandresonance,leadingtovibrations. 3.VibrationMitigationMeasures: 3.1StructuralDesign:Anefficientstructuraldesignthatminimizesthedifferentialthermalexpansionbetweencomponentscansignificantlyreducevibrationsduringcoldstart-up.Theuseofmaterialswithsimilarcoefficientsofthermalexpansion,alongwithpropersupportandalignment,canhelpalleviatethermalstress-inducedvibrations. 3.2ReducingMechanicalStress