讲义教程说明1acfc

AFirstissuestageDOC.PYX17ACO004DJS045GNSYSTEMDESIGNFEEDWATERHEATERSDRAINRECOVERYSYSTEM(ACO)CHAPTER4DESCRIPTION&DEFINITIONOFEQUIPMENTYA:B:C:√Issued ThisisthepropertyofGEDI.Itmustnotbeused,reproduced,transmittedordisclosedwithoutthepriorwrittenpermissionofGEDI.本文件之属于省电力。未获我院，任何人不得擅自使用、、传递或该文件。 准 姜审核 校对 编写 会热签控：电气一次：袁皓电气二次 ABCDEFGCHAPTER4-DESCRIPTIONANDDEFINITIONOF４.1 forafulldescriptionofallthesymbolsusedinthesystemdiagramPleasereferto numberPYX99980001DJS003DD.TheLPheaterNo3drainstoadrainspumpandanautomaticemergencydraintoheaterNo3.ProvisionismadeforsinglebankoperationofeitherdrainspumpondutyforitsconnectionvalvesACO002VLand001VL.LPHeaterDrainsPumpsACO301PO,ACOThe2x50%heaterdrainspumpsarecentrifugalpumpoffivestagestypeandarehorizontallymountedinacan(s).Theyhavecast-steelcasings,stainlesssteelimpellersandmechanicalseals.Thebearinghousingsareremovable,thusoutletisolatingvalves.Descriptionofthecondenserstandpipe(CEX113BA).Thedrainspump,whichdischargesintothemainfeedcondensatelinebetweenLPheaterNos3and4,operateswithaEachbankofLPheaters3normallydraintoassociateddrainspumps.However,singulardutyonitsoppositebankLPheaters3usingvalvesACO001VLandWaterlevelineachLPheaters3ismonitoredbyanelectronicleveltransmitterwhichsignalstoforwardflowandrecirculationcontrolvalvestoregulatethedischargeofdrainspump.4feedwaterpipework.drainspumpdischargecontrolvalve107VL(207VL)andopeningoftherecirculationcontrolvalve108VL(208VL),thusmaintainingtheLPheaters3levelandensuringadequateflowthroughthepump.UpontheLPheaters3levelrisingaboveNWLthentheleveltransmitterwillincreasetheopensignaltotheforwardflowcontrolvalve107VL(207VL).AtHHWLRintheLPheaters3,duplicatedlevelswitchesinitiatetheopeningofvalveABP413VL(513VL)intheemergencydrainlinetostandpipeNO.Thesearep signalsfromtheLPheater3A(3B).TheyaresituatedinthedrainspumpdischargesignalsfromtheLPheater3A(3B).TheyaresituatedinthedrainspumpHHHWLRandtheLPheater3Aand4A(3Band4B),HHWL2Rand3Rrespectivelyduplicatedlevelswitches.Thevalvesaresituatedimmediayupstreamofthedrainspumpsforwardflowcontrolvalves.Nozzles102KDand202KDarefittedintheLPheaterdrainpumpdischargedifferentialbeingcalibratedintermsofflowinKg/sec.TheflowrateisdisyedonWhentheflowrateof102KDor202KDexcesstheflowrate66.67kg/s,alarmincontrolroom.strainersareboltedbetweenflangesinaspoolpiecetofacilitateremovalofthestrainer.Theconicalsectionismadeofperforatedstainlesssteelte.Thestrainersareremoveduponcompletionofsystemcleanupoperations.Numberof2Flow(eachNettgeneratedmNPSHRmNPSHRmmHorizontalNumber2Vthree-phasehorizontalNumberofper2ControlEqualActuator 64 Inlet Numberofper2ControlActuator InletABCDEFGForunit1t