372-power-applications.pdf

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1、PowerPowerApplicationsApplicationsbybyCurtisSterudCurtisSterudw2ApplicationsofCCIvalvesinaB&Wonce-throughunitupgradedforcyclingVALVENO.&PURPOSE205LPSuperheaterStop205CLPThrottleControl207SecondaryBypass210TurbineBypass218SSHOutlerSteamAttemporator219ReheatSHSteamA

2、ttemperator220HPHTRSteamLevel221FlashTanktoHTR230DEASteamPegging231FlashTankLevel240FlashTankPressure241FlashTankLevel401HPThrottleControlAheadoftheSSHTRw2w3CCIControlValvesinnuclearplantsPRESSURIZEDWATERREACTORBOILINGWATERREACTORw4DrumBoilersnDrumboilersvaryinsiz

3、e,fromsmallboilersusedtogeneratesteamindustrialheatinguptothelargepublicutilityboilerswhichproduceenoughsteamtogenerateupto900MWofpower,suchastheLakeCayugaPlantofNewYorkElectricandGas.nWesupplytheBaileythermo-hydraulicfeedwaterregulatorsforsmallboilers.Thecogenera

4、tingunitsarebetween50MWto200MWinsize.Intheseunits,wesupplyfeedpumprecirc.valves,andauxiliarysteamvalves.Ventsareanotherapplication.nCombined-cycleplantsoftenrequireturbinebypassvalvesof50–100%capacity.nLargeutilitydrumboilershavemoresevereserviceapplicationswhichr

5、equireDRAG®valvetechnology.Theseboilersalsorequireturbinebypassvalves.ShownonthefollowingpagesarethetypicalschematicsanddiagramsofareaswhichrequireaDRAGvalve.Theseapplicationsseeeitherthepotentialforcavitation,flashing,oracombinationofhigh-pressuredropandlowflowra

6、te.Therearefourareasthatwewilldiscuss:I.CONDENSATESYSTEMa)CondensatePumpRecirculationValveb)DeaereatorLevelControlValveII.FEEDWATERSYSTEMa)BoilerFeedwaterPumpRecirculationValveb)BoilerFeedwaterRegulatorValve(B&W100)III.MAINSTEAMSYSTEMa)Start-UpSystemValves(B&W)i.5

7、01ii.502iii.518iv.519b)SuperheaterAttemperatorSprayValvec)ReheaterAttemperatorSprayValved)TurbineBypassValve(B&W510—Thisisasmallbypass)e)DeaereatorSteamPeggingValvef)SootBlowerValveIV.HEATERDRAINSYSTEMa)HighPressureHeaterDrainValves,EmergencyHeaterDrainb)LowPressu

8、reDrainValvesw4w5TypicalschematicsanddiagramsofareaswhichrequireaDRAG®valveDiagramofatypicalB&WDrumBoilerwhichincorporatescontrolvalvesfordualpressureop