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发电机定子冷却水入口pH值偏差原因分析.docx

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发电机定子冷却水入口pH值偏差原因分析 Introduction Thecoolingwatersystemofthegeneratorstatorisoneofthemostimportantsystemsinthepowergenerationplant.Asthemainsourceofcoolingforthegeneratorstator,thecoolingwaterplaysasignificantroleinensuringthestableoperationofthegenerator.However,ifthepHvalueofthecoolingwaterisdeviatedfromthenormalrange,itmaycausecorrosion,scale,andotherproblemsthatcanaffectthereliabilityandlongevityofthegenerator.ThispaperaimstoanalyzethereasonsforthedeviatedpHvalueofthecoolingwaterinthegeneratorstator'scoolingsystem. CausesofthedeviatedpHvalue 1.Rawwaterquality RawwatercharacteristicshaveasignificantimpactonthepHofthecoolingwatersystem.Forexample,iftherawwaterisacidic,itwillcauseadropinthecoolingwater'spHvalue,andiftherawwaterisalkaline,itwillcausethecoolingwater'spHvaluetoincrease.Thequalityofrawwatercanchangeovertimeduetoseasonaldifferences,rainfall,andotherfactors,whichcancausechangesinthecoolingwater'spHlevel. 2.Inadequatetreatmentofrawwater Iftherawwaterisnotadequatelytreatedbeforeenteringthecoolingsystem,itwillcontainimpuritiessuchassuspendedsolids,dissolvedsolids,andorganicmatter,whichcancausethecoolingwater'spHvaluetochange.Forexample,iftherawwatercontainsexcessiveamountsofdissolvedsolids,itcancausescaling,whichcancausethepHvalueofthecoolingwatertoincrease. 3.Contaminationofthecoolingwatersystem ContaminationofthecoolingwatersystemduetovariousreasonscanleadtoadeviatedpHvalue.Forexample,ifthereisaleakinthecoolingwatersystem,itcanintroduceairintothesystem,whichcancausethepHvaluetoincrease.Thisisbecauseaircontainsoxygen,whichcanreactwiththewaterandproducehydroxideions,leadingtoanincreaseinthepH. 4.Improperchemicaltreatment TheuseofimproperchemicalsfortreatingcoolingwatercanalsocausethepHvaluetodeviate.Forexample,ifthepHcontrolchemicalisnotaddedinthecorrectquantityorifitisnotaddedontime,itcancausefluctuationsinthepHlevel.Similarly,iftheanti-corrosionchemicalisnotaddedintheappropriateamount,itcanleadtocorrosion,whichcanaffectthepHvalue. 5.Improperoperationofthec