電廠全廠失電工況潤滑油冷卻幻燈片課件

電廠全廠失電工況潤滑油冷卻方式電廠blackout工況潤滑油冷卻方式全廠失電工況，循環(huán)水中斷，開式冷卻水泵和閉式冷卻水泵停止運(yùn)行，轉(zhuǎn)子惰轉(zhuǎn)造成潤滑油溫持續(xù)上升。需要提供額外冷卻水源防止供油油溫超過60℃，防止轉(zhuǎn)子低轉(zhuǎn)速下油膜減薄造成磨損。Duringblackout,circulatingcoolingwaterwillbecutdownandoperationofOCCWandTCSpumpwillstop,coastingdownofturbinerotorwillcausetemperatureincreaseoflubeoil.Soadditionalcoolingwaterisneededtodefenseoiltemperatureatoutletofoilcoolerexceed60℃.電廠blackout工況潤滑油冷卻方式目前廠家的意見是全廠失電期間，通過柴油發(fā)電機(jī)帶一臺(tái)TCS泵運(yùn)行，減少潤滑油溫上升。TCS泵功率較大，為380KW，影響了柴油發(fā)電機(jī)設(shè)計(jì)負(fù)荷。電廠業(yè)主認(rèn)為可以使用一臺(tái)專用小功率冷卻泵冷卻潤滑油，該泵可通過就地柴油機(jī)驅(qū)動(dòng)，請(qǐng)廠家和設(shè)計(jì)院考慮可行性。OpinionofmanufactureisthatoperatingoneTCSpumpbyDieselGenerator,todecreasetemperatureupriseoflubeoil.PowerofTCSpumpismorebiggervalue,itwillaffectdesignpowerofDG.ownerthinkcanuseanadditionallittlepowercoolingpumptocoollubeoil,whichwillconnectedtoaonsiteDieselenginetomakesurethispumpwillbeoperatingduringblackout.電廠blackout工況潤滑油冷卻方式業(yè)主已提出初步方案，在全廠停電工況下，通過手動(dòng)操作，轉(zhuǎn)啟專用冷卻水泵對(duì)潤滑油進(jìn)行冷卻。該初步方案已進(jìn)一步細(xì)化，見方案1：Ownerhaveprovidepreliminarycase,duringblackoutcondition,throughmanualoperating,rotatingthecoolingpumptocoollubeoil.Thepreliminarycasehasdetailedadditionally,detailsincase1.電廠blackout工況潤滑油冷卻方式方案1優(yōu)點(diǎn)：利用CST水位和凝汽器間的高度差、壓力差減少冷卻水泵的揚(yáng)程。如通過水力計(jì)算確認(rèn)可行，冷卻系統(tǒng)可不使用冷卻水泵。Advantage:ThroughelevationdeferenceandpressuredeferencebetweenwaterlevelofCSTandcondensertodecreaseoutletpressureofcoolingpump.Ifconfirmafterhydrauliccalculation,coolingpumpmaybecancelincoolingsystem.方案1缺點(diǎn)：需要操作的閥門較多。在全廠失電情況下，有誤操作的可能。冷卻水在進(jìn)入凝汽器前，因壓力降低，有汽化的可能。Disadvantage:Valveshouldoperatingismuchbigger.duringblackout,existingerroroperating.Beforecoolingwaterintocondenser,coolingwatermaybeboilingbecausepressuredecrease.電廠blackout工況潤滑油冷卻方式方案2：在全廠失電工況，手動(dòng)關(guān)閉冷油器出口冷卻水閥門V3024A(V3024B)，手動(dòng)開啟閥門c1(c2)和閥門d。使TCS系統(tǒng)存水流過冷油器。通過TCS水箱和凝汽器間的高度差保證冷卻水流速。Duringblackout,manualclosingoutletcoolingwatervalveV3024A(V3024B)ofoilcooler,manualopeningvalvec1(c2)andvalved.MakingexistingwaterinTCSsystemacrossoilcooler.ThroughelevationdeferencebetweenwaterlevelofTCSsurgetankandcondensertoensurevelocityofcoolingwater.電廠blackout工況潤滑油冷卻方式方案2優(yōu)點(diǎn)：冷卻系統(tǒng)不需安裝冷卻水泵，專用管道閥門少。在全廠失電情況下，操作員的操作少。Advantage:Itdoesn’tneedtosetcoolingwaterpump,specialtubeandvalveislittle.duringblackoutcondition,方案2缺點(diǎn)：TCS膨脹水箱存水20m3在10分鐘后即已排空，排空后冷卻水流速快速下降。可通過增加TCS膨脹水箱容積解決該問題。冷卻水在進(jìn)入凝汽器前，因壓力降低，有汽化的可能。冷油器中冷卻水流速低，換熱效果差。Disadvantage:Existingwater20m3inTCSSurgeTankwillemptyin10min,afterTCSSurgeTankempty,velocityofcoolingwaterwilldecreaserapidly.ThequestioncanBeforecoolingwaterintocondenser,coolingwatermaybeboilingbecausepressuredecrease.電廠blackout工況潤滑油冷卻方式方案3：增設(shè)一臺(tái)小功率專用TCS泵與現(xiàn)有三臺(tái)TCS泵并聯(lián)，專用TCS泵揚(yáng)程、流量小于現(xiàn)有TCS泵。將專用TCS泵與柴油發(fā)電機(jī)相連。在全廠失電情況下，通過專用泵保證冷油器的冷卻。AdedicatedTCSpumpwithlesspowerwillbeaddedinparallelwithcurrentthreeTCSpump.HeadandflowofthisdedicatedTCSpumpislessthanthecurrentTCSpump.ThisdedicatedTCSpumpwillbeconnectedwithDG.Duringblackout,thispumpwillberesponsibleforcoolingoilcooler.電廠blackout工況潤滑油冷卻方式方案3優(yōu)點(diǎn)：專設(shè)TCS泵功率小于現(xiàn)有TCS泵，對(duì)柴油發(fā)電機(jī)設(shè)計(jì)影響小。充分利用TCS系統(tǒng)存水冷卻潤滑油，系統(tǒng)變動(dòng)少，風(fēng)險(xiǎn)小。方案3缺點(diǎn)：專設(shè)TCS泵需要重新設(shè)計(jì)、采購，其進(jìn)度不能保證。經(jīng)濟(jì)成本較高。AdvantagesofPlan3ThepowerofdedicatedTCSpumpislessthanTCSpump,whichhaslessinfluenceonDG.Fulluseofresidualwatertocoollubeoilandlittlechangesonsystemwithlessrisk.DisadvantagesofPlan3ItisneededtodesignandprocurededicatedTCSpumpwhichwillinfluenceonscheduleanditwillraisethecost.電廠blackout工況潤滑油冷卻方式方案4：在一臺(tái)冷油器入口閥門V3023A前后加裝管道，安設(shè)一臺(tái)管道泵。在全廠失電情況下，關(guān)閉入口閥門V3023A，開啟閥門a和b。轉(zhuǎn)啟管道泵，通過TCS系統(tǒng)管路存水冷卻潤滑油。Plan4:PipeswillbeaddedbeforeandafteroilcoolerinletvalveV3023Aandpumpisdesignedonthispipeline.Duringblackout,V3023Awillbeclosedandvalveaandbwillopen.TheaddedpumpwillstartupandresidualwaterinTCSpipesisusedtocoollubeoil.電廠blackout工況潤滑油冷卻方式方案4優(yōu)點(diǎn)：充分利用TCS系統(tǒng)存水冷卻潤滑油，系統(tǒng)變動(dòng)少，風(fēng)險(xiǎn)小。方案4缺點(diǎn)：管道泵需要重新設(shè)計(jì)、采購，其進(jìn)度和運(yùn)行性能不能保證。缺少布置管道泵的空間。AdvantagesofPlan4Fulluseofresidualwatertoc