參考分析成果

Aissuestage2PHASEI(2x1000MW)廣西防城港核電廠一期(2x1000MW)DOC.BLX17ADG004GJS045GN題 SYSTEMDESIGNFEEDWATERDEAERATING CHAPTER4DESCRIPTIONANDDEFINITIONOFA:B:C:Issued 設(shè)計(jì)院編號(hào)44-H0201S-J0310- GUANGDONGELECTRICPOWERDESIGNInternalIdentificationThisisthepropertyofGEDI.Itmustnotbeused,reproduced,transmittedordisclosedwithoutthepriorwrittenpermissionofGEDI.本文件之屬于省電力。未獲我院，任何人不得擅自使用、、傳遞或該文件。批準(zhǔn)：審核：校對(duì)：編寫(xiě)：會(huì)熱簽控：ABCDEFGThedeaeratorsystemisshownontheflowdiagramBLX17ADG501GJS045DD.AssociatedSystemsrefertoChapter2. forafulldescriptionofallthesymbolsusedinthesystemdiagramPleasereferto numberBLX99980001GJS004DD.EquipmentTheD/A(deaerator)isamildsteelcylindricalpressurevesselfittedwit ends.Theoveralldimensionsare:length50.436m;height6.112m;width5.3m.normaloperatinglevelof+300mmtodeaeratorhorizentalcenterline，thevesselweightis627tonnes,thedryweightis252.5tonnesandthefloodedweightis980Thevesselishorizontallymountedviaonefixedandfourrollingfeet.Internally,thevesselhassixanti-surgebaffleplates,oneimementplatefittedtotheinboardsideofeachoftheouterfeedwatersprays.Thebaffleplatesshallbeextendedtransverselyacrossthevessel,andareaslidingfittedbetweenpairsofgussetsweldedtothedeaerators.Threefunnelsareprovidedprojectingintothebaseofthevesselforthefeedpumpssuction.Three,forthemotordrivenpump(APA)areof650mmnominalsize.Weldedpartsintothethroatofeachfunnelarethreeanti-vortexplateswhicharearrangedinparallel.Flowbafflestoeithersideofthefunnelsarefitted.Theseextendtransverselyacrossthevesseltowhichtheyarewelded.Theplatesriseabovethefunnelsbyapproximay500mmandatthelowerthereisagaptofacilitatedrainage.Three500mminspectiondoorsarefitted,oneineacipticalendandoneontopofthes,andfacilitateaccesstothedeaeratorinterior.Thenumerousadditionalequipment,vesselpenetrationsandfeaturesaredescribedintheensuingsubsections.DeaeratorThefeedwaterentersthedeaeratorvia4piecediscsprayslocatedontopofthedeaerator.Aspraydevicecomprisesastackofstainlesssteeldiscswhich,theinfluenceofinternalwaterpressure,opentodischargecondensateinathinfiprayontoacircularsplashbaflewithinthestorage.Eachofthefoursprayshasanintegraldebrisstrainerandanaccesscovertofacilitatecleaninginspection.Eachspraycanachievetherequireddeaerationforflowratesfrom10%to110%ofitscapability.Therecirculationpump,whichislocatedonthedeaeratorfloorlevelatthesouthendofthedeaerator,recirculatesthecontentsofthedeaeratortoachievehighlevelsofdeaerationduringoff-loadheating.Thepumpenablesuniformheatinganddeaerationofthedeaeratorcontentsatstart-up,whentheauxiliaryrakeisbeingThepumpisprovidedwitha300mmsuctionconnectiononthedeaerators,locatedat ofthe remotefromthesinglesprayinserviceduringstart-up,ensuringumcirculationofthefeedwithinthe.Therecirculationpumpdischargesthrougha200mmpipeintothemaincondensatefeedlineatthedeaeratorinlet.PerformancecurvesfortherecirculationpumpareshownonTherearetotalof4dispensersfittedinternallytotheHPHeaterNo.6Aand6BDrainTherearetwoHPheaterdraindispersersmountingarrangementtoscenterline.Thedisperserspipesare500mmnominal.Thelowersectionofthepipesareeachdrilledwith1,680holesof12mmdiameter.STR ventAsingle20mmnominalpipeentersthedeaeratorbelowNWL.Theflowisviathedispersertothefeedwater.Thedisperserconsistsofacappedstubpipewhichisdrilledwith30holes5mmcondensatefromSTRcondensatecoolerAsingle80mmnominalpipeentersthedeaerators verticallyonthedeaeratorcentreline.Thedisperserisaweldedassembly.Thedisperserconsistsofacappedstubpipewhichisdrilledwith64holesof10mmdiameter.VentTherearesixteen50mmnominalstorageoperationvents,Theventscommoninto65mmpipeworkwhichfittedwithorificeplateandpasstothemaincondenser(duringnormaloperation).Andthereare2deaeratorstartupventlinescombinedandconnectedviaamotorizedisolatingvalvetoatmosphere(whilstoff-loadheatingisselected).Ventchangeoverisautomaticviasignalstomotorizedvalves032VVand033VVrespectively.The50mmnominalventerthetopoftheD/A.ThesefourlinesareventsfromtheHPheaters6A,6B,7Aand7B.LineDrainsTheconnectionsonthebled linecarrydrainstocondenserStandpipeCEX112BA.Amaster/martyrsysteminconjunctionwith trapsisusedtocontrolthedrains.Themartyrvalvesopenautomaticallyforloadsbelow30%.Theyatheprincipleisolatingvalvesandinconsequenceseethemoreonerousserviceconditions.Themastervalvesaremanuallyoperatedandareprovidedtogivetightshutoffwhennecessary.Astheyareonlyusedasabackuptothemartyrvalvestheirserviceconditionsarenotassevereandgoodisolationisensured. trapsbypassthemaster/martyrvalvestoautomaticallydrainanycondensatethcumulatesinthelineduringnormaloperationabove30%load.RakesThreeindependent rakesarefittedwithinthedeaeratorvessel,twomainrakesandonesmallerauxiliaryrake.MainThetwomain rakesaresimilarindesignandconstructionandformamirrorimageaboutthedeaeratorverticalcenterlineasviewedinplanandfrontEachsetrakeisdviasingle750mmnominalpipeswhichpenetratethevesseltop.Insidethevessel,thepipesshallbedividedintotwoparallellongitudinallymountedmanifoldpipesof400mmnominaldiameter.Eachsidemanifoldpipeissupportedby7bracketswhichareweldedtothedeaerators.Fromthebaseofeachsidemanifoldpipeshallbeprojected40piece pipes,22inboardand18outboardofthe inlet.Eachpipeisangledinwardtowardstheoppositemanifolddownpipetowhichitisrigidlyfixed.Tiebarsarealsofittedlongitudinallybetweenalternate rakepipes.Therakepipesare2,894mmlong,80mmnominaldiameter,andarecappedattheirlowerends.Thebottom284mmoftherakepipe,whichiscontinuouslybelowLLWL,isdrilledwith104holesof7mmdiameter.One7mmdiameterholeisdrilledineachendcaptofacilitatedrainage.AuxiliaryTheauxiliary rakeissimilardesignandconstructionasthemainTherakeisdviaa400mmnominalpipewhichpenetratesthedeaeratorvesseltopmarginallyoffcentre.Insidethevesselthepipeshallbedividedintotwoparallellongitudinallymountedmanifoldpipesof200mmnominaldiameter.Eachsidemanifoldpipeissupportedby4bracketswhichareweldedtothedeaerators.Fromthebaseofeachsidemanifoldpipeshallbeprojected6 rakepipes,3inboardand3outboardofthe inlet.Eachpipeisangledinwardtowardstheoppositemanifolddownpipetowhichitisrigidlyfixed.Tiebarsarealsofittedlongitudinallybetweenalternate rakepipes.A300mmnominalconnectionfromthebottomofthedeaeratorsenablesrecirculationofcondensatetocondenser'A'flashboxCEX112BA.ThelineincorporatesamotorizedvalvewhichcanberemoyoperatedfromtheKIC. non-returnvalveGPV50Thisisabled non-returnvalve.Ithasalostmotiondrivefromanexternalactuator.Theactuatorissizedtofullystrokethevalveinservicetoensurethatthevalveisfreemoving. controlvalveThereisalive controlvalve003VVof250mmIN/750mmOUTnominaldiameterusedduringtransientoperationssuchasturbinetrip,loadrejection,orlowloadoperation.Thevalvesarepaticallyactuatedandarefittedwithspringsthattendtoclosethevalves. controlvalve003VVismodulatedbydeaeratorstoragepressurecontrollersto:maintainthepressureatafixedlowvalue(forloadsbelowaboutreducethepressure ontrolledrateofdecayonaturbineloadrejection(forloadsabove30%).Thevalvetripblocksonreceiptofthereactorprotectionsignal controlvalveADGTheauxiliary controlvalveisoftheglobetypewithreducedlineartrimandanoutletdiffuser.Thevalveis200mmnominalsizeandispaticallyactuated.Aspringisfittedwhichtendstoclosethevalve.Thevalveismodulatedviaasignalfromadownstreampressurecontrollertomaintainthedeaeratorpressureat2.7bar.a.Thevalveissituatedinthe200mmIN/400mmOUTnominalauxiliarypipeworkwhichentersthe manifoldandthenintodeaerator.Transformer(STR)DrainCoolerOutlettotheDeaeratorControlValve transformerSTRdraincooleroutlettodeaeratorcontrolvalveisoftheglobetypewith umareaequalpercentagetrim.Thevalveis80mmnominalsizeandispaticallyactuated.AspringisfittedwhichtendstoclosetheThevalveismodulat