介紹1acfca2010 12鄧宏偉雷達

AFirstissuestageDOC.PYX17ABP005DJS045GNSYSTEMDESIGNLOWPRESSUREFEEDWATERHEATERSYSTEM（ABP）CHAPTER5OPERATINGPARAMETERSYA:B:C:√Issued InternalIdentificationThisdocumentisthepropertyofGEDI.Itmustnotbeused,reproduced,transmittedordisclosedwithoutthepriorwrittenpermissionofGEDI.本文件之產(chǎn)權(quán)屬于廣東省電力設(shè)計研究院。未獲我 準 姜審核：校對：編寫：：CHAPTER OPERATINGRatedConditionsElectricalNormaloperatingconditionsareatturbinegeneratorratedconditionselectricaloutputof1086.0MWwiththecondenserpressure0.058bar.4111%-Drainsfromheater(Perheater InletABCDEFGInlettemp.Outlet

ABCDEFGDuplexHeaters(BothNo.1and2LP)IsolatedBothbankofLPduplexheatersisolatedandtheturbinestopvalveswideopen.UnderfromLPheaters3and4tothemaincondenseronreceivingeitheranalarmuponisolationofallLPduplexheatersoronHHHWLintheLP3heater.Thisactionhelpsmaintaintheemergencydrainlineflooded.closedautomatically.Itisoperatoractiontodeterminetheheaterbank(s)causingthetrip,toisolatethedefectiveheater(s),thenreinstatetheotherduplexheater.Systemcharacteristics（AccordingtoheatbalancedrawingCHN809-EnergySector-T01020bR3）--℃--Outletdrainflowperactive--℃--Condensateflowperactive--Condensateinlet℃--Condensateoutlet℃--theNo.3bledsteampipes.ForthisreasontheturbinegeneratorloadsshouldbereducedwhenallLPduplexheatersareisolated.OneBankofLPHeatersNo3and4ABCDEFGOnebankofLPheatersNo3and4isolatedwith50%offlowthroughtheactivebankand50%throughthebypass.Theturbinevalvesareconsideredtobewideopen.Systemcharacteristics（AccordingtoheatbalancedrawingCHN809-℃℃℃Condensateoutlet℃OnebankofHPheatersNo6and7isolatedwith65%offlowthroughtheactivebankand35%throughthebypass.Theturbinevalvesareconsideredtobewideopen.Systemcharacteristics（AccordingtoheatbalancedrawingCHN809-℃ABCDEFGOutletdrainflowperactiveheater℃℃℃*ThisflowrateincludethelowpressurecylinderdrainandglandleakABCDEFGBothBanksofLPHeaters3and4inbledsteampipes.ForthisreasontheturbinegeneratorloadsshouldbereducedtoappropriateloadiftwobanksofLPheaters3and4areisolated. Systemcharacteristics（AccordingtoheatbalancedrawingCHN809-EnergySector-T01019bR2）**--℃--Outletdrainflowperactive--℃------------Condensateoutlet TurbineNoneofthecomponentsintheABPsystempresentanylimitationsontheratesofturbineloadings.TurbineShutdown(loadOnturbinetriporclosureofthebledsteamisolatingvalves,thepressuresintheLPheaters3and4willdecayasthesteamtrappedintheheatersandbledsteamlinesisABCDEFGsamerateastheLPturbinecylinderpressures.outlettemperature(inCEXsystem).Thisrateofreductionisgovernedbytheamountofsteamintheheatersandpipeworkandthemassofmetalinthesystem.ABCDEFGStart-Priortothestart-upthefeedtrainmustbefullyprimed.TheLPcondensatesystemisprimedbyopeningthebypassCEX021VLaroundthedeaeratorisolatingCEX006VLvalvewhilsttheextractionpumpsarerunningonrecirculation.Theheatersshouldbeprimedusinglocalcontroloftheprimingvalves.Theremote(CCR)controlshouldnotbeuseduntilalltheheatersarefullyprimed.theheatersattheoutletside.TheduplexheaterandtheLPheaters3and4banktheoutletisolatingvalvesopenedandfinallytheinletisolatingvalvesopened.FinalAtstart-upallthefeedandbledsteamisolatingvalvesareopenandthefeedbypassvalvesareclosed.Thesepositionsdonotchangeduringstart-uporundernormalworkingconditions.Thebledsteamdrainsmartyrvalvesareinitiallyopenbutcloseduringstart-up(seesection5.6.3.5).NormalDuringnormalshutdownalltheisolatingvalvesstayopenandthefeedbypassvalvesstayclosed(asfornormalworkingoperation).NoneofthecomponentsintheABPsystempresentanylimitationsontheratesofturbineunloading.ABCDEFGoxidationcorrosionresultingfromtheair/watermixtureinthesteamspaces.Theduplexheatersareprotectedbytheplantpreservationsystemwhichcirculatesdryairthroughoutthesteamspaces.TheLPheaters3and4areprotectedbynitrogenpreservationchemicals.ABCDEFGOTHERClosureofBledSteamIsolatingHighhighwaterlevel(HHWL)ineither3or4LPheaterswillopenthemotorisedbypassvalvetotherelevantcondenserandclosethefeedwaterisolatingvalvesandbledsteamisolatingvalvesontheaffectedbank.TurbineAturbinetripwillforceclosethebledsteamnon-returnvalvesandclosethebledsteamisolatingvalves.steamnon-returnvalveswillbemaintainedclosedforthedurationoftheaccelerationABCDEFGCONTROLTheLPheatersNo4havelevelcontrolleddraincontrolvalveswhichcascadetotheLPheatersNo3.Thecontrollingsignalsarefromelectronicleveltransmittersontheheatershells.TheLPheatersNo3draintothedrainingpumps.AndtheLPheatersNo3andtheLPheatersNo4emergencydraintothestandpipe3#(CEX113BA). highwaterlevel indicatesfallinglevel Level1RD —AlarmHWLLevel2RD —Closecondensateinletandoutletisolatingvalves001VL,002VLandLevel2FD —Notpermittoopencondensateinletandoutletisolatingvalves001VL,002VLand003VLLevel1FD—Permitmanualresetofisolatingvalves001VL,002VL,003VLandABCDEFGLPheaterNo3and4bankLevel —AlarmNotpermittostartACOdrainpumpLevel2RD —AlarmHWLStartACOdrainpumpLevel3RD —AlarmHHWLOpenemergedrainvalveABP412VL/413VLLevel4RD—AlarmHHHWLClosebledsteamnon-returnvalvesGPV3151VVandClosecondensateinletandoutletisolatingvalves401VLandOpenbypassvalveCloseLPdrainspumpoutletisolatingvalveLevel4FD ACO106VL，GPV3151VVandGPV4151VV.Level3FD —Forbidmanualresetofisolatingvalves402VV,404VV,401VL，403VL，011VL，ACO106VL，GPV3151VVandGPV4151VV.Level2FD —Permitmanualresetofisolatingvalves402VV,404VV,401VL，403VL，Level1FD —AlarmLWL.Level —AlarmStopACOdrainABCDEFGLPheaterNo3andABCDEFGNotpermittostartACOdrainpumpLevel2RD —AlarmHWLStartACOdrainpumpLevel3RD —AlarmHHWLOpenemergedrainvalveABP512VL/513VLLevel4RD—AlarmHHHWLClosebledsteamnon-returnvalvesGPV3251VVandClosecondensateinletandoutletisolatingvalves501VLandOpenbypassvalveCloseLPdrainspumpoutletisolatingvalveLevel4FD ACO206VL，GPV3251VVandGPV4251VV.Level3FD —Forbidmanualresetofisolatingvalves502VV,504VV,501VL，503VL，011VL，ACO206VL，GPV3251VVandGPV4251VV.Level2FD —Permitmanualresetofisolatingvalves502VV,504VV,501VL，503VL，011VL，ACO206VL，GPV3251VVandGPV4251VV.Level1FD —AlarmLWL.Level —AlarmFunctionalRequirementsofMotorisedLocalopen-closecontrolandindication.ABCDEFGCloseonHHWLinduplexheater.couldbeopened.Thisisachievedbysequentialcontrol.Whenthefeedoutletvalve002VLhasfullyopened,thefeedoutletbypassvalve003VLcanbeclosed.Thefeedoutletvalve002VLmustbefullyopenbeforeitsassociatedfeedinletisolatingvalve001VLcanbeopened.Thefeedoutletisolatingvalve002VLmustbefullyopenbeforetheinletisolatingvalve001VLclosesautomatically.NOTE:Remoteoperation(CCR)ofthebypassandoutletisolationvalvesmustnotbecarriedoutiftheheatersarenotfullyprimed-see5.4.1.LPheaters3and4feedisolating401VL,403VL,ABP501VL,503VLandbypassvalves402VLand502VLLocalopen-closecontrolandindication.Permitopenwhennoclosingsignalpresent.ThebypassvalveABP402VL(502VL)mustbefullyopenbeforethefeedoutletisolatingvalveABP403VL(503VL)automaticallyopens.Thisisachievedbysequentialcontrol(independentforbankAandB).ABP403VL(503VL)isfullyopen.ABP401VL(501VL)canbeopened.NOTE:Remoteoperation(CCR)ofthebypassandoutletisolationvalvesmustnotbecarriedoutiftheheatersarenotfullyprimed-see5.4.1.ABCDEFGLocalopen-closecontrolandindication.OpenonHHWLinanyduplexheater.fullyopen.open(viainterposingtimer).LPheatersNo3and4bypassvalveABP011VLLocalopen-closecontrolandindication.Remoteopen-closecontrolandindication.OpenonHHHWLineitherheater.Openwhenanyfeedisolatingvalve(ABP401VL,ABP403VL,ABP501VLorABP503VL)isnotfullyopen.Alarm-Ifmotorisedbypassfailstofullyopenwheneitherfeedisolatingvalv