2023学年完整公开课版1Valve cooling system

ValvecoolingsystemStateGridofChinaTechnologycollegeChapterIII:ConverterStationValveCoolingProtectionChapter1:ConverterStationValveCoolingSystemEquipmentChapter2:ColdElectricalDesignofConverterStationValveChapter4:CaseAnalysisofValveCoolinginConverterStationtableofContents1.Converterstationvalvecoolingsystemequipment1.1Overview

Theconvertervalveisthecoreequipmentoftheconverterstation.Duringnormaloperation,alargeamountofheatisgeneratedbythelargecurrentofthethyristor,whichcausesthetemperatureofthethyristor,reactorandothercomponentstorisesharply.Topreventthesecomponentsfrombeingdamagedduetoexcessivetemperature,theconverterstationThevalvecoolingsystemisconfiguredtocooltheconvertervalve.

Theconverterstationvalvecoolingsystemincludesavalveinternalcoolingsystemandavalveexternalcoolingsystem.Thein-valvecoolingsystemisaclosedcirculationsystemthattakesawaytheheatgeneratedbytheconvertervalvethroughtheflowofthecoolingmedium,andthecoolingmediumisdeionizedwater.Asmallportionofitpassesthroughawatertreatmentcircuitinwhichthecoolingmediumiscontinuouslydeionizedandfiltered.Theexternalcoolingsystemisanopenwatercirculationsystemthatusessoftenedwatertocontinuouslycooltheinternalwatercoolingsystempipingthroughthecoolingtowertoreducetheinternalwatercoolingtemperature.1.2In-valvecoolingsystem1.Mainlooppart2.DeionizedwatertreatmentandRegulatedrehydrationsection3.Coolingmedium,circulationline,sensorsandaccessoriesInnercoolingsystem(1)Maincirculationpump(2)Maincirculationcircuitmechanicalfilter(3)Electricheater(4)Electricthree-wayvalve(5)Degassingtank(1)Ionexchanger(2)Precisionfilter(3)Nitrogenorhighwatertankregulator(5)Make-uppump/rawwaterpump(4)Rawwatertank1.2.1maincirculationloop

Themaincirculationcircuitincludesamaincirculationpump,amaincirculationfilter,anelectricheater,anelectricthree-wayvalve,anelectricbutterflyvalve,adegassingtank,andcorrespondinginstruments.1.2.1maincirculationloopInternalcoldwaterflowdiagramHighwatertankMainfilterelectricThree-wayvalveRawwatertankDeionizationunitMaincirculationpump1.2.1maincirculationloop1,themaincirculationpump(p01/p02)

Themaincirculationpumpistheheartofthewater-coolingsystem,providingtherequiredpowerfortheclosedcirculatingfluid.Themaincirculatingpumpisacentrifugalpump,whichismechanicallysealed,1isused,andthestartingmodeissoft-starttopower-frequencyoperation.Themaincirculationpumppowersupplylineswitchisdedicatedbythestationpowersetting,andthetwomainpumppowersourcesarerespectivelytakenfromdifferentbuslinesofthestationpower.Themainpumpswitchinglogicisautomaticallyswitchedafter168hoursofnormalcontinuousoperation.Atthesametime,itcanbeswitchedbetweenthelocaloperationpanelandthebackgroundowsvalvecoldcontrolinterfaceasneeded.Mainpumpsoftstartcuttingpowerfrequencycontrol:Themaincirculationpumpadoptssoftstartcontroltostartthepowerfrequencyoperationmode,whichcanmakethemotorstartingvoltagerisesteadilywithaconstantslope,thestartingcurrentissmall,noimpactonthepowergrid,andthevalvecoolingsystemtubeisreduced.Themechanicalimpactoftheroadandthepump,thestartingvoltageriseslopecanbeadjustedtoensurethesmoothnessofthestartingprocess.Thesoftstarteristheprincipleofapplyingthethyristorphase-controlledvoltageregulation.Bychangingthephasecontrolangle,thevoltagemeansquareaddedtothestatorischanged.Rootvalue.Inthisway,asufficientstartingtorqueisensured,andsincethestartingvoltageissmall,thestartingcurrentiseffectivelylimited.Astherotationalspeedincreases,theequivalentimpedanceoftherotorbecomeslargerandtheterminalvoltagecanbegraduallyincreasedbyalowerinitialvoltage,andthestatorcurrentcanbecompletelycontrolledtoasmallerrange.1.2.1maincirculationloop1.2.1maincirculationloop2,themaincirculationpump(p01/p02)Whenthefollowingabnormalconditionsoccur,thesystemwillautomaticallycutthepump:

Faultcutpump:mainpumpoverheatalarm(morethan95°Cofmainpumpoverheatprotectionsetting),maincirculationpumpfaultalarm(circuitbreakerprotectionandthermalrelayprotectionaction),stationpower400vpowerfailure(busbarpowerloss)

Pressurelowcuttingpump:Whenanyoneofthemainpumpoutletpressuretransmittermeasurementvalueislowerthantheprotectionsettingvalueandanyoneoftheinletvalvepressuretransmittermeasurementvalues​​islowerthantheprotectionsettingvalue,after3secondsdelay,switchstandbyThepumpfrequencyisdirectlyoperated.Whenthisalarmispresent,thesystempressureislowandthemainpumpisnolongerperformingtheswitch.P01pressureislow,switchtop02,p02alsohaslowpressure,switchinglogicispressurecontinuestobelow+manualconfirmationandthencutback1.2.1maincirculationloop2,themaincirculationpump(p01/p02)Cuttingpumpfailurere-cut:currentrunningmainpumpoverheatalarm,maincirculationpumpfaultalarm,stationpower400vpowerfailure,"mainpumpoutletpressurelow+inletvalvepressurelow"alarm(directpowerfrequencystart).Eachmainpumpisequippedwithasafetyswitch.Whentheequipmentneedstoberepaired,thesafetyswitchshouldbedisconnectedandtheinletandoutletvalvesshouldbeclosed(eachvalveisequippedwithalimitdevice,andthehexagonalhandleisrequiredtoopenthelimitdeviceduringoperation).1.2.1maincirculationloop3,themainwaterfilter(z01/z02)Thevalvecoolingsystemconsistsoftwosetsofmaincirculationfilters,whichareplacedbeforeenteringthevalvebodycoolertopreventthecirculatingcoolingwaterfromescapingthefallinglooseparticlesintothevalvebodyduringrapidflow,withanaccuracyof100μm.Whenthefilterisequippedwithadifferentialpressuresensor(dPI01anddPI02)greaterthan0.6bar,itshouldbemanuallycleanedonline.1.2.1maincirculationloop4,electricthree-wayvalve(k001,k002)Theelectricthree-wayvalveadoptsmechanicallinkagetype,andcooperateswiththeelectricbutterflyvalvetoadjusttheratiooftheflowratethroughtheoutdoorheatexchangeequipmentandtheflowratewithoutpassingthroughtheoutdoorheatexchangeequipment,andisusedforcoolinginthewinterwhenthetemperatureisloworthevalvebodyisreducedinpoweroperation.Thewatertemperatureisadjustedtoavoidthecoolingwatertemperaturebeingtoolow.1.2.1maincirculationloop4,electricthree-wayvalve(k001,k002)Theelectricthree-wayvalvesk001andk002adoptsynchronouscontrol,andtheon-siteandbackgroundstatusareconsistentandthesameisthesame.Theelectricbutterflyvalveisarrangedonthepipelineinfrontoftheelectricthree-wayvalve,andtwosetsareusedforselectingandswitchingwhentheelectricthree-wayvalveisfaulty.Controlstrategyforelectricthree-wayvalve:1)Whenthevalvetemperatureis≥25°C,thethree-wayvalveisfullyopen,andthewaterflowsthroughtheoutdoorairradiatorforheatdissipation.2)Whenthevalvetemperatureis≤20°C,thethree-wayvalveisfullyclosed,andthewaterflowdoesnotdissipateheatthroughtheoutdoorairradiator,soastoavoidthewatertemperatureoftheinletvalveistoolow.V006,v007electricbutterflyvalvecontrol(oneforone,afterthefaultfirstopenandthenoff)1)Twoelectricbutterflyvalvesadopttheone-on-one-offcontrolmode.Whenv006isturnedon,v007shouldbeclosed.Whenv006isclosed,v007shouldbeopen.2)Whenv006isnotopen,v007willautomaticallyopentothelimitandv006willbeclosedagain.3)Whenv007isnotopen,v006willautomaticallyopentothelimitandv007willbeclosedagain.4)Whenv006isturnedon,thek001electricthree-wayvalveisfaulty,v007isautomaticallyopenedtothelimit,andv006isclosedagain.5)Whenv007isturnedon,thek002electricthree-wayvalveisfaulty,v006isautomaticallyopenedtothelimit,andv007isclosedagain.1.2.1maincirculationloop1.2.1maincirculationloop5,degassingtank(c31)Itisplacedattheinletofthemaincirculationpump,andthetopofthetankisprovidedwithastainlesssteelautomaticexhaustvalve,whichcanautomaticallydischargethecoolingwater.Thedegassingtankisalsousedasaheatingtank,andthein-valvecoolingsystemelectricheaterisinstalledinthedegassingtank.1.2.1maincirculationloop6,electricheater(h01/h02/h03/h04)Atotaloffourheatersareplacedinthemaincoolingcircuitofthevalveforthetemperatureregulationofthecoolingwaterinthewinterwhenthetemperatureisextremelyloworthevalvebodyisstopped,soastoavoidthecoolingwatertemperaturebeingtoolow.Whentheelectricheaterisrunning,thevalvecoolingsystemcannotbestopped,andtheflowofcoolingwaterinthepipelinemustbemaintained,eveniftheconvertervalvehasalreadywithdrawnfromoperation.1.2.1maincirculationloopElectricheatercontrolstrategy:1)Whenthecoolingwaterinletvalvetemperatureis≤16°C,theelectricheatersh01andh02arestarted;whenthecoolingwaterinletvalvetemperatureis≥18°C,theelectricheatersh01andh02arestopped.

2)Whenthecoolingwaterinletvalvetemperatureis≤15°C,theelectricheatersh03andh04arestarted;whenthecoolingwaterinletvalvetemperatureis≥17°C,theelectricheatersh03andh04arestopped.3)Whenthecoolingwaterinletvalvetemperatureiscloseto/belowthevalvehalldewpoint1°C(thedewpointtemperatureisdeterminedbythetemperatureandhumidityofthevalvehall),4electricheatersareforciblystarted.4)Thestartoftheelectricheaterisinterlockedwiththemainpumpoperationandtheultra-lowvalueofthecoolingwaterflow.5)Aftertheelectricheaterhasbeenworkingcontinuouslyfor60minutes,ifthevalvecoolingsystemstillhas“lowinletvalvetemperature”or“inletvalvetemperatureislowerthandewpoint”,the“valvecoldelectricheatingfailure-pleasecheck”faultisreported.6,electricheater(h01/h02/h03/h04)1.2.2Deionizedwatertreatmentcircuit

Thewatertreatmentdeionizationcircuitisconnectedinparalleltothemaincirculationcircuit,andismainlycomposedofanionexchanger,aprecisionfilter,arawwatertank,amake-upwaterpump,arawwaterpump,andaninstrumentmeter.1.2.2Deionizedwatertreatmentcircuit1,ionexchanger(c01,c02)

Theionexchangeriscomposedofastainlesssteeliontank,afilter,anionexchangeresin,andthelike.Partofthemediuminthemaincirculationloopispurifiedbyanionexchanger,andtheconductivityofthevalvecoolingsystemismaintainedwithinacertainrangeforalongtime.Theionexchangeresinusesimportednucleargradenon-recycledresinandisdesignedfortheremovaloftraceions.Therearetwosetsofionexchangers,oneforone,andwhenoneoftheresinsfails,analarmsignalisissued,promptingtoreplacetheionexchangeresin.Thedeionizationcircuitsetstheflowswitchtomonitortheloopflow,andeachionexchangeroutletisprovidedwithaconductivitysensortomonitorwhethertheresinisinvalid.1.2.2Deionizedwatertreatmentcircuit2,precisionfilter(z11/z12))Precisionfilter(Z11/Z12):Accuracy≤10μm,withareplaceablefilterelementplacedattheoutletoftheionexchangertointerceptresinparticlesthatmaybreakandflowout.1.2.2Deionizedwatertreatmentcircuit3,hydrationsystem

Thewatersupplysystemconsistsofanautomaticwatersupplypump,arawwaterpump,awatersupplyelectricvalve,arawwatertank,aventilationsolenoidvalve,andafilter.Theoriginalwaterpumpisusedtoreplenishtheexternalwatersourceintotheoriginalwatertank.Theoriginalwaterpumpoutletisprovidedwithamechanicalfilter,andapressuregaugeisarrangedbeforeandafterthefilter.1.2.2Deionizedwatertreatmentcircuit3,hydrationsystem

Thereare2setsofmake-upwaterpump,1for1preparation.Whenthecoolingmediumislostduetoasmallamountofextravasationorelectrolysis,whentheliquidlevelofthehighwatertankisreducedtothelevelofthereplenishingwater,themake-uppumpstartsautomaticallyandstopsautomaticallywhenthepumplevelisstopped.Theautomatichydrationprocessisintermittenthydrationtopreventrapidchangesinsystempressureduetoexcessivehydrationspeed.Theintermittenthydrationmodeisautomatichydrationfor2minutesandthenstopsfor3minutesuntilthehighleveltanklevelreachesthepumpstoplevel.Themake-uppumpisalsoequippedwithalocalmanualstartfunction.Theoriginalwatertankisequippedwithahighandlowliquidlevelswitch.Whenthelowliquidlevelisset,thewaterpumpisstoppedtopreventthewaterpumpfromsuckinginair.Whentheliquidlevelishigh,theoriginalwaterpumpstopsrunning.Aventilationsolenoidvalveisarrangedatthetopoftheoriginalwatertank.Whentheoriginalwaterpumpandthesupplementarywaterpumparetransported,theelectromagneticvalveopenstheexhaustgasandtheintakeair.1.2.2Deionizedwatertreatmentcircuit4,voltageregulatorsystem(highwatertank)Thehighwatertankisplacedinthecoolingwatercircuitofthevalve,whichislocatedatthehighestpointofthepipeatthetopofthevalvehall,andtogetherwiththedegassingtank,thefunctionofdischargingthegasinthecoolingwater,andensuringtheconstantpressureofthepipeline.1.2.2Deionizedwatertreatmentcircuit4,voltageregulatorsystem(expansiontank)

Theinternalcoldwatersystemexpansiontankisplacedinthewatertreatmentcircuitofthevalvecoolingsystem,andislinkedwiththenitrogenpressureregulatingdevicetokeepthepressureofthepipelineconstant,andthemediumsupplyiscompletedtogetherwiththesupplementarywatercircuitandthedeionizationcircuit.Anaerationdeviceisarrangedatthebottomoftheexpansiontanktoincreasethesolubilityofnitrogen.Whendegassing,theoxygeninthemediumisremovedmoreeffectively,whichcanbufferthevolumechangecausedbythetemperaturechangeofthevalvecoolingsystem.Nitrogenvoltagecontrol:Twosetsofairsupplycircuitareset,whicharecontrolledbyv503solenoidvalveandv504solenoidvalverespectively,andcanbeputintooperationthroughv430orv504ontheoperationpanel.Whenthepressureoftheexpansiontankislowerthanthesetvalue,theairsupplysolenoidvalveopenstheairsupplyoperation,andwhenthepressureoftheexpansiontankreachesthesetvalue,theairsupplystops.Whentheplenumsolenoidvalveiscontinuouslyconditionedfor40minutes,whenthepressureoftheexpansiontankhasnotreachedthesetpressure,thesolenoidvalveisreportedtobefaultyandswitchedtoanothersolenoidvalve.Theexhaustcircuitisprovidedwithav511solenoidvalve.Whenthepressureoftheexpansiontankishigherthanthesetvalue,theexhaustsolenoidvalveopenstheexhaustgas,andwhenthepressureoftheexpansiontankreachesthesetvalue,theexhaustgasstops.Whentheexhaustsolenoidvalveiscontinuouslyexhaustedfor5minutes,thefailureisnotreportedwhenthestoppressureisreached.1.2.2Deionizedwatertreatmentcircuit4,voltageregulatorsystem(expansiontank)1.2.2Deionizedwatertreatmentcircuit4,voltagesystemThehighwatertankandtheexpansiontankareprovidedwithtwosetsofindependentcapacitiveliquidlevelgaugesandonesetofmagneticflaptypeliquidlevelgauges.Whennormal,thetwooutletsaretakenaccordingtothree,andonesensorisswitchedouttobeoperatedandthenchangedtotwooutlets.Inthecaseoffailureofbothcapacitivelevelgauges,themagneticflapdoesnotparticipateintripping(becausethemagneticflapwaterlevelsignalissusceptibletointerference),preventingthemagneticflapsignallevelinterferencefrombeingdisturbedandcausingfalselockout.

Whentheliquidlevelofthehighwatertankandtheexpansiontankisgreaterthan1600mm,thehighliquidlevelalarmisissued.Whentheliquidlevelislessthan300mm,thelowliquidlevelalarmisissued,andwhentheliquidlevelislessthan100mm,ittrips.1.2.3Mainpipeandconnectingparts1.Thecirculatingpipelinesaremadeof304lormorestainlesssteelpipes.2.Theconnectionbetweenthepipeandtheequipmentisweldedorflanged.Allstainlesssteelequipmentandpipesareweldedbyargonarcwelding.Tomakethepipingsystemadjustableduringinstallation,astainlesssteelhoseisplacedattheendofthepipe.3.Setstainlesssteelcompensatorattheinletandoutletofthemainpump.4.Thehighestpositionofthepipelinesystemisequippedwithanautomaticexhaustvalve,whichcanautomaticallyandeffectivelyperformgas-waterseparationandexhaustfunctionstoensureminimumliquidleakage.1.2.4SensorConfigurationInordertoensurethesafeandstableoperationofthesystem,preventtheconvertervalvefrombeingstoppedduetotheinstrumentfailureofthevalvecoolingsystem,andsetupredundantinstrumentsformonitoringtheimportantparameterssuchasthecoolingwaterconductivityofthevalvecoolingsystem,whicharehotstandbyforeachother.Thesensorsthatdirectlygeneratetripping,suchastheexpansiontanklevel,theinletpressure,andthecoolingwaterflow,areallsettoatripleconfiguration.1.3OutervalvecoolingsystemTheexternalcoldwatersystemismainlycomposedofaspraysystemandawatertreatmentsystem.Themainequipmentofthespraysystemincludesanevaporativecoolingtower,aspraypumpandaspraypool.Themainequipmentofthewatertreatmentsystemhasanactivatedcarbonfilterandafullyautomaticanti-cleaningfilter.,backwashwaterpump,supplementarywatersofteningequipment,spraywaterdosingsystem,self-circulatingfiltrationsystem,saltpool,sewagesystem,etc.1.3OutervalvecoolingsystemExternalcoldwaterflowdiagramCoolingTowerSpraypumpSprinklerpoolSaltpoolActivatedcarbonfilterSofteningunitSelf-circulatingpump1.3.1Sprinklersystem1,spraypump

Thereare6setsofspraypumpsdividedinto3groups,p31andp32areonegroup,p33andp34areonegroup,p35andp36areonegroup,andtwospraypumpsareusedonebyone.Asinglespraypumpautomaticallyswitchesfor168hoursofcontinuousoperation.1.3.1Sprinklersystem1,spraypumpSpraypumpcuttingpumpconditions:1)Thewaterpressureofthespraypumpislow,andthecontrolsystemwillissuea“pumppumppressurelowswitching,pleaseconfirmlocally”alarm.Ifthealarmexists,thespraypumpwillnotswitch.2)ThecurrentrunningspraypumpfailureInaddition,eachspraypumpisequippedwithasafetyswitch.Whentheequipmentneedstoberepaired,thesafetyswitchshouldbedisconnectedandtheinletandoutletvalvesshouldbeclosed(eachvalveisequippedwithalimitdevice,andthehexagonalhandleisrequiredtooperatethelimitdeviceduringoperation).turnon).1.3.1Sprinklersystem2,coolingtowerThereare6setsofcoolingtowerfansdividedinto2groups,g01,g03,g05areagroup,g02,g04,g06areagroup,thefanstartingmodeistherotatingfrequencyconversionmode,andthesinglefanfrequencyconversionfaultisautomaticallyswitchedtothepowerfrequencyoperation.Whenthe"fanfrequencyconversionfailsovertothepowerfrequency,pleaseconfirminplace"alarmexists,thefaultyfanwillnolongerperformtheswitch.Therefore,whenthereisafanfailure,theoperatingpersonnelshouldhurryuptothesiteforinspectionandpromptlyeliminatethefault.Theorderofcuttingthefanistocutfirst.Variablefrequencyspeedcontrolofthefan:Thespeedofthefaniscontrolledbythetargettemperaturesettingvalueandthecurrentcoolingwaterinletvalvetemperature.Thetargettemperaturecanbesetontheoperationpanel.Theplcvariesaccordingtothecurrentcoolingwaterinletvalvetemperatureandthetargettemperature.Afterperformingthepidoperation,ananalogsignalisoutputtothefrequencyconverter,andthefrequencyconverterup/downaccordingtotheincrease/decreaseofthesignal,controllingthefanspeed,therebychangingtheheatdissipationofthesystem,andgraduallyincreasingthetemperatureofthecoolingwaterintothevalve.Approachingthetargettemperatureandfinallystabilizingaroundthetargettemperature,thepurposeofaccuratelycontrollingthetemperatureofthecoolingwaterintothevalveisachieved.1.3.1Sprinklersystem2,coolingtower1.3.1Sprinklersystem2,coolingtowerCoolingtowerfancontrollogic:1)Startagroupwhentheinletvalvetemperatureisgreaterthan33°C;2)Whentheinletvalvetemperatureisgreaterthan36°C,startanothermovinggroup;3)Stopwhentheinletvalvetemperatureislessthan32°Candthefanfrequencyislowerthanthelowerlimitfrequency(20Hz);4)Stopanothergroupwhentheinletvalvetemperatureislessthan29°Candthefanfrequencyislowerthanthelowerlimitfrequency(20Hz).1.3.1Sprinklersystem3,spraypool

Theindustrialwaterpassingthroughthewatertreatmentcircuitiscollectedinthespraypool,thewaterinthespraypoolispumpedtothecoolingtowerbythespraypump,andtheheatpipeintheinnercoldwaterpipeissprayedandcooled,andthenreturnedtothespraypool.1.3.2Watertreatmentsystem1.3.2Watertreatmentsystem1,backwashingdevice

Thebackwashingdeviceisinstalledbesidethespraypumpset,includingabackwashingwaterpump,aninletandoutletvalve,anelectricvalve,etc.Whentheactivatedcarbondeviceandtheself-flushingfilterneedtobebackwashed,acleanwatersourceisprovided.Thebackwashingdeviceisprovidedwithtwobackwashingwaterpumps,oneforeach,andthebackwashingwatersourceissoftenedwater.1.3.2Watertreatmentsystem2,activatedcarbonfilterTheactivatedcarbonfilterconsistsofactivatedcarbontank,shellactivatedcarbon,quartzsandcushion,electricvalve,instrumentationandaccessories.Theactivatedcarbonfilterhasworkingmodessuchasrunning,washing,andbackwashing,andisautomaticallycontrolledbyanelectricvalve.Theactivatedcarbonbackwashingusesdemineralizedwaterandbackwashingwithabackwashwaterpump.1.3.2Watertreatmentsystem2,activatedcarbonfilterThebackwashconditioncontroladoptsthecumulativeflowcontrol,andthecumulativetreatmentflowrateisdesignedtobe400m3/hpositive/backwashonce.Washingtime:10minutes,backwashingtime:10minutes,positivewash/backwashflow:40m3/h,suppliedbybackwashpump.Duringbackwashing,theelectricvalveV701isclosed,theelectricvalvesV705andV706areopened,thebackwashingelectricvalveV746isopened,andthebackwashingwaterpumpP46/P47isstarted.1.3.2Watertreatmentsystem3.SofteningdeviceThesofteningdeviceiscomposedofanionexchanger,acontrolvalve,asalttank,asaltsuctionpumpandasaltpool.Theexternalwatercoolingsystemhastwosetsofsofteningunits.Duringnormaloperation,onesetofsofteningunitsisputintooperationandtheothersetisreserved.Whenthesoftenerisrunning,thespraywaterpassesthroughtheresinlayerfromtoptobottom,andthepositiveionsintherawwater,especiallycalciumandmagnesiumions(Ca2+,Mg2+),arereplacedwithsodiumions(Na+)inthesofteningunit,sothatthehardwaterisobtained.soften.1.3.2Watertreatmentsystem3.SofteningdeviceTheworkingprocessisdividedintosoftening,backwashing,regenerating,slowwashingandwashing.Thesoftenerisusedonebyone.Thesinglesoftenerbackwashingregenerationcanselectthecumulativetreatmentflow.Thecumulativetreatmentflowisdesignedtobe120m3/hbackwashingandregeneration..TakingC47asanexample,onlytheopeningvalveisopened,andtheotherrelatedvalvesareclosed.Backwashingtime:15minutes(electricvalveV717,V718isopen),regenerationtime:30minutes(electricvalveV720,V718isopen),slowwashingtime:20minutes(electricvalveV717,V718isopen),washingtime:10minutes(MotorvalvesV715,V719areopen).Thebackwashingwatersourceissupplementedwithindustrialtapwater,andthebackwashingtimeisstaggeredfromthebackwashingtimeofthecarbonfilterandtheself-filter.Thetwosoftenersarealternatewitheachother.Whenonesoftenerfailsorneedstoberegenerated,theotherisautomaticallyputintooperationandthelogiccontrolisthesame.1.3.2Watertreatmentsystem4,self-circulationdeviceTheself-circulatingdeviceisinstalledbesidethespraypumpset,includingaself-circulatingwaterpump,afilter,adrainvalve,etc.,andthewaterinthespraypooliscontinuouslyfilteredtomeettherequirementsofthewaterqualityofthespraypool.Thedischargeflowfromthecirculationdevicecandisplaytheaccumulatedflow,andthesewagedischargecanbedischargedregularly.Thesewagecanbedischargedaccordingtothewaterqualityofthepoolorthecumulativeflowofthesupplementarywater.Thewaterqualityofthespraypoolcanmeettherequirements.1.3.2Watertreatmentsystem5,dosingsystemThedosingsystemiscomposedofasterilizingagentdosingdeviceandacorrosionandscaleinhibitordosingdevice.Fungicidedosingdevice:Inthecirculatingspraywater,inordertopreventthespraywaterfrombreedingalgae,itisnecessarytoregularlysterilizeandkillalgae.ItadoptsGermanMiltonLuointegrateddosingdevice,whichhasfeweroperatingelementsandlongusetime,andcanrealizeregularquantitativeautomaticcontroldosing.Corrosionandscaleinhibitordosingdevice:Inordertopreventthespraywaterfromcontinuouslyconcentrating,itwillcausecorrosionandscalingontheheatexchangecoil,andincreasethecorrosionandscaleinhibitordosingsystem,whichcanreduc