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600WM火电机组低压缸轴瓦振动异常分析及处理.docx

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600WM火电机组低压缸轴瓦振动异常分析及处理 Abstract Theabnormalvibrationofthelow-pressurebearingofthe600MWthermalpowerunithasbeenaproblemforpowerplants.Unreasonabledesignandinstallation,improperoperationandmaintenancecanleadtobearingdamageandevenseriousconsequences.Inthispaper,thecausesofabnormalvibrationoflow-pressurebearingsinthermalpowerunitsareanalyzed.Thevibrationproblemsthatmayoccurinthebearing,aswellasthemeasurestopreventanddealwiththemareproposed. Introduction Thelow-pressurebearingofthe600MWthermalpowerunitisanimportantpartofthepowergenerationsystem,whichsupportstherotorandtransferstheloadoftherotortothefoundation.Inrecentyears,powerplantshavereportedvariousproblemswiththelow-pressurebearingofthe600MWthermalpowerunit,suchasabnormalvibration,frequentbearingdamage,andevenscrappedgenerators.Theseproblemsnotonlyaffecttheunit'sstableoperationbutalsobringhugeeconomiclossestopowerplants. CausesofAbnormalVibration 1.BearingDamage Thebearingpadsaredirectlyincontactwiththejournalbearingsloadedbystaticanddynamicloads.Thehighfrequencyofrotationandtheheavyloadcausedamagetothebearingsovertime.Whenthebearingisworn,theclearancebetweenthebearingandtheshaftwillincrease.Theincreasedclearancewillcausethebearingtooscillate,whichcanleadtoabnormalvibration. 2.Misalignment Ifthealignmentoftherotorisnotadjustedproperlyduringinstallation,thecomponentswillbeundergreatstress,whichwillcausethelow-pressurebearingtovibrate.Oneofthecommonrootcausesofmisalignmentisthermalexpansion,whichiscausedbydifferentialheatingoftherotorandcasing. 3.Imbalance Iftherotorisnotproperlybalanced,itmaycauseabnormalvibration.Themainreasonfortheimbalanceisthatthemassdistributionoftherotorandothercomponentsisuneven. 4.LubricationIssues Lubricationproblems,suchasinadequateoilsupplytothebearingortheuseofcontaminatedoil,canleadtoabnormalvibrationinlow-pressurebearings. DealingwithAbnormalVibrations 1.RegularInspections Regularinspectionscanpreventtheoccurrenceofabnormalvibrationandextendthelifeofthebearings.Inspectionscanalsohelpide