第二次技术澄清厂家答复-noor iii文件-电气description for air

AIRCOOLEDFUNCTIONALDESCRIPTIONFORAIRCOOLEDCONDENSER空冷凝汽器功能描述TABLEOFRELATEDS相关文 GENERALDESCRIPTIONOFTHESYSTEM系统总体描 MAINCOMPONENTSOFACC空冷系统主要组 PHILOSOPHYOFTHESYSTEM系统原 GENERALDEFINITION一般定 NUMBERINGOFVALVESPIPESANDMEASURINGCIRCUITS阀门道测量回路编 ACCFUNCTIONALGROUPS空冷功能 DUCT排汽管 Instrumentation仪 Philosophyofthesystem系统原 Alarmsandtrips和跳 CONDENSERWITHFANUNITS带有风机组的凝汽器 Instrumentation仪 Philosophy原 Alarmsandtrips和跳 Start-upandshut mendations启动和停机建 CONDENSATESYSTEM凝结水系 DRAINPOTDRAININGSYSTEM疏水坑疏水系 AIREXTRACTIONSYSTEMTOBECONFIRMEDBYCLIENT抽真空统(由业主确认 3.5.1Description描述3.5.2Instrumentation仪器3.5.3Philosophy原理3.5.4Alarmsand和跳闸错误!未定义书签。START-UPANDSHUTDOWNSEQUENCE启动和停车次 Start-upSequence启动次 Shutdownsequence停机顺 Plantinstandby OPERATIONMODE(PRELIMINARY-操作模式(初步 AUTOMATICMODE自动操作模 MANUALOPERATIONFROMCONTROLROOM来自控制间的LOCALMODE就地模式(byClient由客户操作 ACCCONTROLSYSTEM空冷控制系 TURBINEBACKPRESSURECONTROL汽机背压控 Instrumentation仪 Philosophy原 Therulesofthestep-switching开关步骤规 ABNORMALPLANTOPERATIONSPLANTTRIPSSUMMARY操作-工厂跳闸 56MAINTENANCEOFTHESYSTEM 57GENERALCOMMENT概 DAILYMAINTENANCE每日 57 57MONTHLYMAINTENANCE每月 58 58ANNEX1:ACCPRESSURECONTROLPRINCIPLE附件1：空冷压力控制原 ANNEX2:ACCFANSCONTROLSTEPS附件2：空冷风机控制步 ANNEX3:ACCVALVESCONTROLSTEPS附件3：空冷阀门控制步 ANNEX4:INSTRUMENTATIONLIST附近4：仪表 60RELATEDS相关文Rev版号Description描述-FanControlsteps--AP&ID–&condensatesystem-AP&ID–Airtake-off&cleaningsystem-Instrumentationlistperfunctional-Importantnotes重要ThisfunctionaldescriptionismadeforthetwoUnits.ForUnit1,thefirsttwodigitsare“01”.ForUnit2,thefirsttwodigitshastobereplacedby“02”.本功能描述适用于两台机组。当用于1号机时，首两位数字为“01”；当用于2号Refertodrawings _DWG0030and _DWG0032forscopeofsupply.供货范围参阅图纸DWG0030和DWG0032GENERALDESCRIPTIONOFTHESYSTEMMAINCOMPONENTSOFACCs数Description描述TAGNUMBER签6Street(s--1Mainduct主蒸汽管21TurbineExhaustBox--3100Vacuumpumpsskidforholding01MAJ21hogging01MAJ2201MAJ23定负荷1Cleaningskidpump泵01PAH21perstreetofthestreet列号123453Primarymodule(s顺流（初级）01MAG901MAG901MAG92SecondaryorMixed01MAG901MAG9101MAG942/condensateheaderspermoduleβofthemodule单元号=1234s数Description描述TAGNUMBER签--101MAG9PHILOSOPHYOFTHESYSTEM系统Theair-cooledcondenser(ACC)condensestheturbineexhaustorthede-superheatedfromtheturbinebypassbyrejectingtheheattotheThecondenserconsistsof6"A"roof-typestreetsoffinnedtubeelements.Eachstreetcontains5modules(3primaryand2mixedmodules).Eachmodule(01MAG9AN00β)iscomposedof10bundlesoffinnedtubes.空冷凝汽器由6列“A”型屋顶型翅片管排构成。每列管排包含5个单元（3个一单元和2个混合单元）。每个单元(01MAG9AN00β)10片翅片管束构成AnaxialflowfanlocatedunderneaththeroofforcesthecoolingairthroughtheTheflowsthroughonelargediameterduct01MAG90BR001tothecondenser.Theductsystembranchesinto2risers(01MAG90BR002/003)、6forks(01MAG9BR001)and distributionmanifolds(01MAG9BR002/003/004/005)runningalongthetopofeachstreet.entersfromthisdistributionmanifoldintothefinnedtubesatthetopoftheprimarycondensing(01MAG90BR002/003)、6个支管(01MAG9BR001)和顶部蒸汽分配管BR002/003/004/005)。蒸汽通过分配管进入顺流管束的翅片管About85%ofthe iscondensedduringthedownwardflowinthetubesoftheprimarybundles(andcondensate:co-currentfromtoptobottom).Condensateandremainingarecollectedinlargesize headersrunningalongthebottomofthe"A"roof.Theremaining (ca.15%)entersthefinnedtubesofthesecondaryheaders.Thedeflegmentesincounterflowmodeandnon-condensablegasesflowupwardswhilethecondensateflowsdownwardtothe/condensateheaders.Inthisway,thecondensateisalwaysheatedbyandsub-coolingisThenon-condensablegasesaccumulatenearthetopofthecondensingbundlesandaredrawnintotheairtake-offmanifoldsrunningalongthetopofthesesecondarybundlesThesemanifoldsareconnectedtothevacuumsystemthroughairtake-offlinesinordertoremovethenon-condensablegasesfromthecondenser.Thecondensate,whicharecollectedinthe/condensateheaders,drainbygravitytotheTurbineExhaustBox(TEB),whichistheextensionoftheturbineexhaustdevice,fromwhereitispumpedbythecondensateextractionpumpstotheboilersystem.InsideofTurbineExhaustBox,condensatesaredispersedinordertoreheatitGENERALDEFINITION一般定义Term术Definition定义outof21逻Acontrollogiconparameter(i.e.temperature,pressure,level,…)measuredby2instrumentsisvotinga1outof2logicwhentheDCS,whichreceivesthesignalsoftheseinstruments,surveysthemforoutofrangeortooimportantdifferencebetweenthetwoIfthe2signalsareinthemeasuringrangeandthedifferencebetweenthemdoesn’texceedagivendifferencethemeasurementsareconsideredasvalid.Anaverageonthetwomeasurementsismadewhichleadstotheaction(s)(control,alarm,trip,…)Shouldasignalbedetectedasoutoflimits,itisrejectedandaDCSalarminformsoperatorofthesystemfault.Onreceiptofthesinglefailure,theDCStripvotingsystemusestheremaininghealthy如果测到超范围信号，则系统会并且DCS会向作员。一收到单一故障信号 触发选择系Term术Definition定义Ifbothsignalsfailorifthedifferenceexceedsthegivenvaluetheoperatorwillreceiveafurtheralarmtoindicatethatameasurefailurehasoccurredandthecontrollogicwillassumethefailedstate.、Term术Definition定义outof32逻Acontrollogiconparameter(i.e.temperature,pressure,level,…)measuredby3instrumentsisvotinga2outof3logicwhentheDCS,whichreceivesthesignalsoftheseinstruments,comparestheminordertoascertaintheir行3选2的控制逻辑。当DCS接收到这些信号Ifall3signalsarevalid,theaction(alarm,trip,…)isvotedbasedontheaverageofthe3signals.取动作(、跳闸…)Shouldasignalbedetectedasoutofrangeortoodifferentfromthetwoother,itisrejectedandaDCSalarminformsoperatorofthesystemfault.Onreceiptofthesinglefailure,theDCStripvotingsystemusestheremaininghealthysignalsona1outof2logic大，则该信号会被放弃并且DCS会向操作员系故障。一但收到故障信号，DCS系统按21SeerelevantACCFUNCTIONALGROUPS空冷功能组TheACCconsistsofthefollowingfunctionalgroupsDescription描述Tagnumber编号组condenserwithfanunit01LCA9xAirextractionsystem01MAJ9xCleaningsystem系01PAH2x DUCT排汽管s数Description描述SizeTAGNUMBER号1Mainduct主蒸汽1Thermalexpansionbellowgroup1TurbineexhaustboxTEB)--301MAG96Lateraltypethermalexpansion01MAG96Hingetypethermalexpansion01MAG96distributionmanifolds)蒸汽01MAG901MAG901MAG901MAG9Rupturedisc(s)s数Description描述SizeTAGNUMBER号3Mainductpressuretransmitter(s)forMonitoring&controlAlarmTripaction--01MAG9001MAG9001MAG901--3Mainducttemperatureelement(s)forMonitoring&controlAlarmTripaction--1-Instrumentation仪Pleasereferto“Instrumentationlistperfunctionalgroup”[K- _LIS6402latestrevision].请参照文 版按照功能组划分的仪表Philosophyofthesystem系统Theturbinebackpressureismeasuredbythepressuretransmitters01MAG90CP101/102/103onthemainduct01MAG90BR001andservestocontrolfanoperation(seesection6.1).Incaseofoverpressure,thetransmittersuseavoted2outof3logic,sendingtheturbinebackpressuretotheDCSandclosingthebypassvalvesandcausingthetripoftheturbine.Thetemperatureelements01MAG90CT301/302/303servestoprotectthecondenseragainstoverheatingbyclosingthebypassvalvesandcausingthetripofthe汽机背压由主蒸汽管道01MAG90BR001上的压力变送器Composite-typerupturediscsareusedforprotectingACCfromanoverpressureconditionwhencontrolfailstosolvetheproblem.Thediscsaredesignedtoexplodeandprovidefull-openingandinstantaneouspressurereliefandallowthedischargeofflowrateincaseofhighpressure.的设计目的是在压力过高时完全，将高压的蒸汽流瞬时排放出去。Basedonthehypothesisgiveninthedesignnoteforrupturediscs(please§1.0),4rupturediscs(1)ofDN750havetobeinstalledonthe设计计算考虑了膜设计说明给出的假设(请参考§1.0)，在空冷凝汽器上得安 个DN750的膜(1)incaseoftheturbineisalreadyprotectedbysomerupturediscs(TOBECONFIRMEDBYDESIGNINSTITUTE),thisnumbermaybereducedconsequentlyAlarmsandtrips和跳闸(Preliminary初步TAG号Set设定作AlarmtoDCSDCSAlarmtoDCSDCSCloseallbypassturbinetripAlarmtoDCSDCS(2out(■)Closeallbypassvalves关闭所有蒸汽旁路阀(■)turbine0Overtemperatureinduct癈Overtemperatureconsecutivetime(■)Inordertoavoidoscillatory0Overtemperatureinduct癈Overtemperatureconsecutivetime

Figure2Seeparagraph2.4General3Seeparagraph2.4GeneralTurbinetripshallbedefinedbyturbinerandactivatedbyinstrumentsinstalledonturbineorTEB. CONDENSERWITHFANUNITS带有风机组的凝汽器Thecondenserismadeoffinnedtubesassembledinbundlesandgroupedinmodules.Fansprovidethecoolingairflow(oneforeachmodule).PrimarymodulesandSecondaryorMixedmodulesareequippedwithEachfanunitisequippedwithavibrationswitchtoprotectagainstunacceptablevibrationofthefan/gearbox/motorunit.Setpointforvibrationswitchisadjustedtoumsensitivityduringcommissioning.Eachgearboxisfittedwithapressureswitchtoavoidoperationwithoutlubrication,alevelgauge(ordipstick)tochecktheoilcontentandatemperatureelement.每Themotorforeachunitisequippedwithtemperatureelementstoprotectagainsttoohightemperatures.数SizeTAG号6xPrimary(4)module(s)初级单11525x01MAG901MAG901MAG96xMixed(5)module(s)混合单11525x01MAG901MAG9Permodule每单元βofthemodule单元号=1234510000/9200--132ft/975401MAG91132kW/1-1AlarmandTrip--01MAG91OilpressureswitchAlarmandTrip--01MAG91--01MAG91--01MAG91Fanmotorspace--01MAG95Mixedmodules混合单元modulesmadeofprimaryandsecondarybundlesdephlegmator数SizeTAG号3Motortemperatureelementforhighspeedonwinding1,2,3for:Controland--01MAG901MAG901MAG9Instrumentation仪Pleasereferto“Instrumentationlistperfunctionalgroup”[K- _LIS6402latestrevision]. Philosophy原TheinstrumentsprovidedwiththefansarehardwiredtotheDCSfortripactionsandalarmpurposes.风机的仪表与DCS通过硬接线相连以备跳闸和MoreinformationonfanswitchingforACCcontrolphilosophyisavailableunderchapter6.0-ACCCONTROLSYSTEM.TAG号Setvalue01MAG9Setpointforvibrationswitchisadjustedtoumsensitivityduringcommissioning.AlarmtoDCSDCSTRIPtheconcernedfan’smotor相关TAG号Setvalue01MAG9AlarmtoDCSDCSTRIPtheconcernedfan’smotor相关01MAG9AlarmtoDCSDCS01MAG901MAG901MAG9AlarmtoDCSDCSTRIPtheconcernedfan’smotor相关Start-upandshut mendations启动和停机建Thepressureswitchestripsandalarmsareinactiveduringfanstart-upforaperiodof5to15seconds(adjustablewithinthesoftwareandadjustedduringResetofvibrationswitchisdonemanuallyonsitebytheThecompleteorderstart/stopsequenceofthefanswillfollow _DES6403latestrevision–Fancontrolstep”(later)designnoteinordertohaveahomogenouscoolingandavoidfreezing. revision–风机控制步骤”(暂定)设计说明，以均匀冷却避免冷冻。如果齿轮箱油温低于(暂定)电机跳闸Ifgearbox’soiltemperaturereaches(later),ahightemperaturealarmissenttotheoperator.Ifgearbox’soiltemperaturereaches(later),thefanmotorisCONDENSATESYSTEM凝结水系统CondensatesfromtheAirCooledCondenserarecollectedandconductedbygravitytotheTurbineExhaustBox(TEB)locatedunderneathturbine,whichhasanextensiontocollectthem.DRAINPOTDRAININGSYSTEM疏水坑疏水系Thecondensatescollectedatthelowestpointofthemainduct(01MAG90BR001)arecollectedinaDRAINPOTonthemainductandthentransferredtotheTurbineExhaustBox(TEB)bygravitythroughpi01MAG90上的疏水坑，然后在重力作用下通过管道01MAG90BR050.输送至排汽装置。Description描述Theairhastobeevacuatedfromthecondenserbeforecanbeintroducedinthesameforcondensation.Forhoggingpurposethree100%(holdingcapacity)vacuumpumps(01MAG21/22/23AP001)areprovided.Eachofthosepumpsaredesignedfor133kg/hairatnominalpoint.When“hogging”(duringstart-up),therequirementistolowerthepressureasquicklyaspossible.Inthiscaseallthreepumpsarerequiredtodecreasefromatmosphericpressureto34kPain40minutesand14kPain60minutes.RemarkInwinterconditions(temperaturelowerthan-3°C),thelowestvacuumaspossible(about6kPa)mustbereachedpriortheintroductioninordertolimitfreezingproblemsatstart-up.备注：在冬季（温度低于-3°C），在蒸汽引入之前，要尽可能达到最低真空度（6kPa）以在启动时限制结冰现象的When“holding”(duringnormaloperation),noncondensable,whicharecomingfromairingressandoxygencontentin andcondensate,mustalsobeextractednormallybyonepump.Ideallythecontrolshouldalternatethepumpskidsforholdingfunctions.Thiswillprovideevencyclingtimeontheskidsandpreventthecustomerfromrunningoneskidmuchmorefrequentlythantheother空气在正常情况下必须用一或二台泵抽出。理想情况下,维持真空阶段,真空泵交替Underspecialconditionssuchaslowpartialload/deepvacuum,unexpectedhighairleakageresultinginamajortemperaturedifference(above10°C)betweentheexhaustturbinetemperatureandallair-takeofftemperaturemeasurement,thesuctioncapacitycanbeimprovedbyusing2vacuumpumpssimultaneously.在特殊情况下，如局部真空，未预料的过高的空气导致排汽汽机温度和所有的 以上），可以通过同时使用两台泵加大抽空能力。Remark:Inthenextpageofthis ,askidwillrefertoavacuumpumpsetwiththefollowingdevices,whichmustbecontrolledorwiredtothecontrolsystem.(xintheTAGnumber=1forskidA,2forskidBand3forskidC):空泵设施。（在号中的x=1指泵组A，2指泵组B，3指泵组C）。1pressureindicator01MAJ2xCP501atskidinlet/泵装置1个压力1pressureindicator01MAJ2xCP503atvacuumpumpinlet/泵1个压力1pressuretransmitter01MAJ2xCP101atskidinlet/泵装置1个压力变1waterringvacuumpumpanddrivemotor01MAJ2xAP001/1个水环真空1separator01MAJ2xBB001/一个分离液位1separatorleveltransmitter&switch01MAJ2xCL101/一个分离箱液位2temperatureindicators01MAJ2xCT501/502atinletandoutletofheatexchanger/换热器各1个温度计1flowswitch01MAJ2xCF101onheatexchangerdischarge1swingcheckvalve01MAJ2xAA501/11make-upwatervalve01MAJ2xAA0801/Instrumentation仪器认Pleasereferto“Instrumentationlistperfunctionalgroup” _DES6402latestrevision]. Philosophy原理ThevacuumsystemcanbestartedwhenThecoolingsystemisinThevacuumpumpstobeoperatedhavebeenThewaterlevelinthepumpseparatorsissufficientlyhigh(betweenminimumandumlevel)泵分离器的水位足够高（介于最低和最高水位之间 Holdingoperation(onevacuumpumpinoperation). Duringcertainoperationcases,2vacuumpumpsshalloperatesimultaneously.DuringHogging,all/condensateisolationvalvesareopenedcorrespondingtostep00(seeDES6403–FanControlStep)Whenasuctionpressureofabout8kPato15kPa(adjustable)isreached(onpressuretransmitters01MAG90CP101/102/103)Unitsaresettoholdingposition(1or2Incaseofstart-upinwintercoldconditions,ACCstreetshavetobeisolatedasrequired(andcondensatevalvesclosed)beforeinjection.在建立真空时，所有的蒸汽/冷凝水阀按照步骤00的要求打开（DES6403-风机控制步骤当真空泵抽气压力达 8-15kPa（可调的）时，（在压力变送器01MAG90如果冬季冷态启动，在蒸汽进入之前关闭所有蒸汽/冷凝水阀，已完成对空冷管列的.Thepackageunitsaresettoholdingpositionbyshuttingdownthestand-byvacuumpumps(2outof3pumps).Thesuctioncapacitycanbeimprovedbyusing2vacuumpumpssimultaneously,underspecialconditionssuchas:Lowpartialload/deep在特殊情况下可以通过同时运行2台真空泵提高吸力，如：未预料的大量空气 Asageneralrule(tobeconfirmedduringcommissioning),secondvacuumholdingpumpshallbeautomaticallyputintooperation:whenmajortemperaturedifferencebetweenexhaust extractiontemperature注意通常规定（需在试运行期间确认），当发生下列情况时，第二台真空泵或－结冰情或－汽机背压低于13kPa（可调或－排汽和抽空之间的温度差异Valves(01MAJ2xAA001)mustbeopenedafterthevacuumpumpfortheappropriatepackageunitisstarted.在适于成套设备的真空泵启动后，阀门 AA001)必须打开Valves(01MAJ2xAA001)mustbeclosedbeforethevacuumpumpfortheappropriatepackageunitisswitchedoff.在适于成套设备的真空泵关闭前，阀门(01MAJ2xAA001)必须关闭CLEANINGSYSTEM系统（暂定Ahigh-pressurewatercleaningsystem(approx.8MPa)isprovidedtorestoreperformancebycleaningthefinsurface.Onehigh-pressurepumpwithamotorprovidesthecleaningwaterflow.Distributionlinesconveythewatertoeachroofside.Onequick-linkconnectiononeachstreetdistributedalongtheroofconnectsthedistributionpi.Aflexiblehoseconnectsthedesiredcleaningheaderset(upper,middleandlowerheader)fixedtothemovableaccessladders.置1套高压水系统（约8Ma），通过翅片表面恢复凝汽冷却性能。水源由一台带电机的高压水泵提供。分配管将水输送至各个屋顶侧。各列沿屋顶分布快接接头，与分配管连接。通过软管把需要的喷头装置（上、）数Size小TAGNUMBER1Cleaningsystemwatersupply11x100pump1motor电机--11Safetyreliefvalve(s)安全阀77Cleaningsystemwaterofthestreet列号123456Instrumentation仪Pleasereferto“Instrumentationlistperfunctionalgroup” _DES6402latestrevision]. ThisparagraphgivesgeneralprincipleforwatercleaningofACCFormoredetailedprocedure,pleaserefertothe“Cleaningsystemprocedure”(see§1).ThedistributionlinesarefirstpurgedforairDraincleaninglinevalveischeckedclosedandallventcleaninglinevalvesareopened.Wateriskeptflowingthroughthedistributionlinesuntilnomorebubblescomeoutatthetop(thisisperformedstaticallywithwaterdatapp.3bar(g)atTP91).Thispurgeisveryimportantasairpocketsmaycausewaterhammerlateron,whichmightdamagethepumpandthepi.OncethepurgeissatisfactorytheventcleaninglinevalvesmaybeTheselectedcleaningheadersetisconnectedtothenearestoutletviathehigh-pressurehosepipe.Onlyoneofthethreeheaders(upper,middleorlower…)isopenatatimeviathecorrespondingvalve.Thepumpmaynowbestarted.Thepumppressuremaybefinelyadjustedthroughthepressureregulatingvalve.Oncewaterisejectedathighpressureviathenozzlestheladdermaybemovedalongslowly(approx.1m/minute).Threepassageswillberequiredforthethreeheaderstocleanthetotaltubelength.We mendturningthepumpoffbeforetheflexibleisdisconnectedpriortoproceedingwithcleaningwithanotherexchangerWhencleaningisfinishedallcleaningventlinevalvesandthecleaningdrainlinefreezing.Afterallwaterisdrainedoutofthepitheventsmaybeclosed.Frequencyofthecleaningistobedefinedonsite.Itmayvaryfromonceamonthtoonceayearfromsitetositedependingonthesurroundingatmosphere.Ahighdustcontentandairhumidityarefavourableforfinfouling.Seasonalchangesinthefoulingspeedoffoulingmayalsobeobserved. Whencleaningbundlesabovetransformerorhighervoltagelines,specialattentionshallbetakentolimitthewaterflowingontheseequipments.Moreover,transformervendorshallconfirmthatcleaningwaterrainisnotaffectingsafeoperationofhighvoltagetransformerandsystem.注意：在时，如管束下有变压器或高压线，要特别注意限制水流到这些设备上，同时变压器供货商应确认水流不会影响高压变压器和系统的安START-UPANDSHUTDOWNSEQUENCEThesearegeneralsequences;pleaserefertospecificparagraphformoredetailedStart-upSequence启动次Thesearegeneralsequences;pleaserefertospecificparagraphformoredetailedprocedures.以下是概括的次序，详细过程请参考具体段落。AllmanualvalvesandventsareclosedaccordingtoPID按照PIDDWG0030/32，所有手动阀和Allsealwaterlinesareopen,ifany.的话，所有的密封水管开启Themaincondensateexhaustdevicesarefilledwithmake-upwaterpH9)tonormallevel.用补充水（PH=9）将主冷凝水抽气装置充注到正常水位。Thecondensercontrolsystemisplacedatthestep00(seeDES6403–Fanallisolatingvalvesopened.门控制工序）(暂定)所有风机停止并且所有蒸汽阀打开。condensate/airtake-offlinesshallbefullyopen(Step00).开（工序00）。Allvacuumunitsareactivatedandrununtilapressureof34kPaatminimumonpressuretransmitters01MAG90CP101/102/103onmainductsisCP101/102/103达到最低34kPa的压力。BeforeadmissionintheACC,thecondensercontrolsystemshallbeplacedinStep00(→allisolatingvalvesareopened)Oncetheplantisreadytosupply,isinjectedintothecondenserviatheturbinebypassvalves.ACCmaystartslowlyat34kPa.34kPa压力下缓慢启动。Stopof2vacuumpumpsoutof3maybedecidedwhenairtake-offtemperaturehassufficientlyrisen(seeNote1).Atthismoment,selectedholdingunittakesover(tobedecidedbyother).Theautomaticfancontrolisreleasedstartinginstep00(all valvesopenedandallfansOFF-SeeDES6403/6404).laterInnon-freezingmode,steps0to(later)areDuringhoggingoperationall condensate/airtake-offlinesshallbefullyopen(Step00).开（工序00）。Allvacuumunitsareactivatedandrununtilapressureofpreferably6kPaatminimumonpressuretransmitter01MAG90CP101/102/103onmainductisreached.CP101/102/103达到最低6kPa的适宜压力。BeforeadmissionintheACC,thecondensercontrolsystemshallbeplacedinStep0(→allisolatingvalvesareclosed).OncetheplantisreadytosupplyandACCinStep0,isinjectedintothecondenserviatheturbinebypassvalves.Stoponeofthethreevacuumpumpsmaybedecidedwhenairtake-offtemperaturehassufficientlyrisen(seeNote1).Theautomaticfancontrolisreleasedstartinginstep0(all valvesclosedandallfansOFF-SeeDES6403/6404).(later)DES6403/6404）。(暂定Note注解feymsdardsonnchheumsrokn,enudtts,tcg20%ml flowlotrtk-fts01MAJ9T301302ett0°Caeb.sstowfrceervanbfenrasgtetdtoeos.dthismttevsttorcksdrretlxtn.如果系统真空破坏导致停机过程加长，应稍慢注入蒸汽，蒸汽流量不超过额定流量的20％，直到大多数的抽出空气温度01MAJ9CT301/302至少超过环境温度10°C以上。这是为了在增加冷凝器热负荷之前让全部空气排空。事实上，此同一温度证明没有气包（冷区）存在。Freezingweatherstart-up:冰冻气候条件下Duringfreezingweather,thecondensershallbebroughttotheminimumpressurebeforeinjectionof,preferably6kPa.The flowhastobeincreasedasquicklyaspossibleuptothedefinedminimumflow在冰冻气候条件下，在注入蒸汽前冷凝器要实现最低6kPa更适宜的压力状态。蒸汽流ColdstartisNOTallowedatambienttemperaturesbelow16°Cprelim.)Incasestart-upoccursatambienttemperaturebelow15°Canalarmshallbesenttotheoperator.当环境温度低于-16°C(初步)时不允许冷启动。当环境温度低于-15°C启动时，系统会向Whenanisolatedstreetisopenedthespeedoftherunningfanofbundlesisslowdownautomaticallyinordertocompensatetheheatexchangesurfaceincrease.当一个列打开时，运行管束下的风机速度自动下降下来以补偿热交换表面增加。Whenhighairleakageissupposedandminimum1timeperweek,theairingressintothecondensershallbecheckedwiththevacuumpumpsstoppedandisolated(seevacuumdecaytest,procedurePRO7706).当将发生大量空气泄漏，并且每周至少一次，要在真空泵停止和的情况下检查冷凝器的空气泄漏。（见真空衰减测试，程序PRO7706）。Shutdownsequence停机顺Thecondensingcapacityisreducedautomatically(stepswitch)astheflowtothecondenserdecreasesuntilallfansarestopped.TurbineisshutdownandbypassAtshutdown,vacuumbreaker(ifany)shallbeopenedbysignalfromturbinecontrolsystem.在关闭时，真空破坏阀（）要由来自汽机控制系统的信号打开All/Condensateisolatingvalvesshallbeinopenposition(➔Step00所有蒸汽/冷凝水阀门要设在开的位置(→工序00)Ifaprolongedshutdownisforeseenwherefreezingispossible,thepartsofthecondensatesystemthatcanfreezehavetobedrainedwhentheambienttemperatureisalreadybelowzeroorwhensubzerotemperaturesareexpected.Weinsistparticularlyonthedrainingofthevacuumsystem,thepumpsandthecleaningsystem.WatersealsareshutoffwhenvacuumisreducedtoPlantinstandbyDuringstandby,thecondensershallbeheldundervacuumatapprox.6to8kPabytemporarilyusingavacuumpump,dependingupontheavailabilityoftotheturbineglandsystem.OPERATIONMODEPRELIMINARY-运行模式(初步AUTOMATICMODE自动运行模ThecontrolsystemregulatesTheexhaustpressurebyselectingtheappropriatecondensingstep(seechap.6)takingintoaccounttheambienttemperatureandfreezeprotectionactions.andthefollowingprotectionsareThepressureintheduct(protectionThetemperatureintheduct(protectionCoolingflowtothevacuumpumpsystem(vacuumpumps).(byVibration,oilpressureandoiltemperature,motorwiringtemperatureonfanassemblies(protectionaction).MANUALOPERATIONFROMCONTROLROOM来自控制室的Itispermittedtooperateoneequipmentmanuallyfromthecontrolroomwhentherestofthesystemisfullyautomatic.Anyspecificcondensingstepcanbeselectedmanually(steps00toXXsequentially)butmustbereleasedautomaticallywithinshorttimeforfreezing任意特殊的冷凝步骤都可手动选择（00(XX)），但当系统在防冻保护LOCALMODE就地模式(byClient由业主操作Eachvacuumpumporfancanbeoperatedmanuallybyalocalswitch(ifadequateequipmentisforeseen).Itisallowedtooperateonepieceofequipmentlocallywhentherestofthesystemworksautomatically. EachEach每一个泵或风机可被就地开关手动操作（如果配有适当的设备）每一台每一每一台ACCCONTROLSYSTEM空冷控制系统TURBINEBACKPRESSURECONTROL汽机背压Thecontrolsystemmodulatescontinuouslynumberoffansintooperation,fanspeedandisolatingvalvepositionbasedonthedifferencebetweenbothmeasuredandsettingbackpressure.Instrumentation仪Pleasereferto“Instrumentationlistperfunctionalgroup” _LIS6402latestrevision]. Philosophy原Thecontrolsystemselectsfanspeedcombinationsand/condensateisolatingvalvespositionsasafunctionofmeasuredturbinebackpressure01MAG90CP101/102/103andbackpressuresetpoint.CP101/102/103和背压设定值的函数值。Fanspeedcombinationand /condensateisolatingvalvespositionaredescribedin DES6403“Fancontrolsteps”andDES6404“Valvecontrolsteps”(later)appendedinannex2.DES6403indicateswhichfansarerunningatmodulatedspeedandwhichonesarestopped(moduleinnaturalconvection).DES6404indicateswhichvalvesareopenorclosedandthereforewhichstreetsareintooperation. 指明哪台风机按调节的速度运行，哪台停止（在自然对流单元里） 指明哪个阀开或关，以及哪列运Thereare(XX)(fromstep00tostep(XX))condensingcapacitysteps.Eachstepisacombinationoffanstatusand/condensateisolatingvalvespositions. umcondensingcapacitystepoftheunitcorrespondstothelaststep(Step(later)).ThistablehastoberespectedinalldetailsforagoodACCInthefanstart-upsequence,closeattentionhastobegiventoalwayscondenseinsideACCinthemosthomogeneousway(i.e.runningfanshavetobebalanced,asfaraspossible,betweenallthestreets).Innon-freezingcondition,thefanstartingsequenceistheFirstfanstobestartedineachstreetarealwaysthefanunderneaththesecondaryBundles(Mixedmodules)(atshutdown,thosefanswillbethelastfanstopped).Then,whensecondarymoduleineverystreetarestarted,primarymodulesmaybestartedandbalancedstreetbystreet.When2ormorefansarereleasedtostart,slighttimedelay(15secondsadjustable)shallbeappliedbetweenindividual在非结冻的条件下，风机启动序启动，并一列一列地平衡启动。当2个或风机被解除连锁去启动时，每台风机之间应有15秒钟（可调整的）的启动间隔。Infreezingcondition,thefanstartingsequenceistheSamestartingsequenceforthenon-isolablestreetsthantheabovedescribedThen,firstisolablestreetisopened(andcondensateisolatingvalvesopen,seeopeningsequenceherebelow)andallfanswithinthisopenedstreetstartingfromsecondaryfan.在结冻条件下，风机启动序列如FanmotorsarefedthroughVariableFrequencyDrivers.Allrunningfanswillrunatsamespeed.MeasuredturbinebackpressureshallbecomparedinDCStosetpointandpressurecontrollershalladjustcontinuouslyspeedofallrunningfansbymeansofthevariablefrequencydrives.Afanspeedincreasewillproduceabackpressurereductionandvice-versa.DCS上与设定点比Aminimumfanspeedisrequestedtoensureacorrectoilflowinsidethegearbox.Atstart-upfanstartsataminimumvelocitycorrespondingtoelectricalsupplyat15Hz(setpointsetinVFD).Whentheheatloadisreducedandallfansarealreadyatminimumspeed(correspondingto15Hz),theymaybestoppedoneaftertheother(sequenceofshutdownreversetostart-upsequence,seeDES6403–FanControlStep–Step1tostep(later)).DES6403-风机控制步骤：步1-步(later)）Whensomefansinastreetarenotrunning,thecontrolsystemmodulatestheotherrunningfansspeedbymodulatingelectricalsupplyfrom15Hzto40Hz(preliminary)forPrimaryModulesandfrom15Hzto40Hz(preliminary)forMixedModules(SeeDES6403–FanControlStep).Whenallfansinast