直接空冷與間接空冷技術(shù)改進

EGICoolingSystemTrading〔Beijing〕Co.,Ltd.

億吉埃冷卻系統(tǒng)貿(mào)易〔北京〕

GEA集團GEA集團組織結(jié)構(gòu)工藝過程技術(shù)能源與農(nóng)業(yè)技術(shù)空氣處理農(nóng)業(yè)技術(shù)熱能工程排放控制機械分離工藝工程制藥設(shè)備制冷技術(shù)工藝設(shè)備直接空冷ACC間接空冷主講人：彭純

公司組織結(jié)構(gòu)公司產(chǎn)品范圍電站干式冷卻系統(tǒng)空冷凝汽系統(tǒng)〔ACC〕濕式冷卻系統(tǒng)自然通風冷卻塔核電超大自然塔排煙式自然塔〔煙塔合一〕海水自然塔機械通風冷卻塔輔助通風自然塔組合冷卻系統(tǒng)干濕混合式卻塔干濕并行冷卻系統(tǒng)〔PAC〕GEA公司所創(chuàng)造的世界上第一套發(fā)電用直接空冷凝汽系統(tǒng)于1939年在德國魯爾礦區(qū)投運，至今仍可運行南非馬廷巴電廠〔6X665MW〕——目前世界上最大容量的空冷電廠空冷凝汽系統(tǒng)〔ACC〕MatimbaACClayout馬廷巴電廠實拍〔1991〕Whatisrecirculation?熱風再循環(huán)現(xiàn)象橫向風倒灌縱向風旋渦AtMatimbaturbinetripswereexperiencedduringwesterlywinds(i.e.windscomingovertheboiler+turbinehalltowardstheACC.在馬廷巴工程中,汽機跳閘發(fā)生在爐后來風的情況下AfterexhaustiveCFDworkontheMatimbaACCtheseproblemscouldbeascribedto:根據(jù)經(jīng)過大量CFD研究，馬廷巴的問題原因可以歸結(jié)如下:Fansstallingduetohighcrossflowvelocitiesundertheouterfansofunits1to6ACC的外側(cè)風機在下部橫切風較大時，出現(xiàn)風機失速現(xiàn)象,從而導(dǎo)致風機出力下降。Poor‘breathing’oftheACCduetosmallairinletopeningsontheWsideoftheACC(turbinehallside)ACC與汽機房相隔太近，影響了該側(cè)進風。RecirculationofhotairduringperiodswithWwinds爐后來風時存在熱風再循環(huán)現(xiàn)象TheseproblemswiththeMatimbaACCwerealleviatedbymodifyingsomecladdingatturbinehallandACCtherebyincreasingairinlettoACC通過在汽機房外墻上開通風窗的措施，改善空冷島進風狀態(tài)，馬廷巴電廠的上述問題得到一定程度的減輕。MedupiACCvsMatimbaACC米都比與馬廷巴空冷島參數(shù)比照MatimbaACCMedupiACCNumberofunits空冷島臺數(shù)6x665MW6x800MWNumberoffansperunit每臺空冷單元數(shù)量4864Totalnumberoffans總風機數(shù)288384Fandiameter風機直徑30ft34ftFantype風機類型StandardLownoisePlotarea空冷島面積70.8mx509.5m(36071m2)108mx669m(72252m2)Deckheight空冷平臺高43.5m54mNumberofexhauststeamducts主排汽管數(shù)量22Diameterofexhauststeamducts主排汽管直徑5m6.2mDesignwindspeed(@40melev.)設(shè)計風速（40m標高處）0m/s9m/sMatimbaPSACC馬廷巴空冷島MedupiPSACC米都比空冷島MedupiACClayout米都比空冷島布置圖〔數(shù)模分析〕Feature1:gapbetweentheturbinehallandtheACC(toimprove‘breathingofACCduringoperationwithWwind)特點1：增大空冷島與汽機房間距〔改善爐后風占主導(dǎo)時的空冷島進風情況〕gapFeature2:TheuseofawindcrossongroundlevelbelowtheACC(ensuresgoodairflowthoughthecompleteACCduringnon-Wwind)特點2：在空冷島內(nèi)內(nèi)0米處設(shè)置十字交叉的導(dǎo)風板〔保證非爐后風時空冷島進風狀況〕，這種設(shè)計對無風狀態(tài)無負面影響，也易于實現(xiàn)。Feature3:solidwalkwayaroundtheoutsideofwindwalls(reducesrecirculationforallwinddirections)特點3：空冷平臺以上局部的步道設(shè)在擋風墻外〔減小各風向的熱風再循環(huán)〕Feature3(cont.):solidwalkwayaroundtheoutsideofwindwalls(reducesrecirculationforallwinddirections)特點3〔續(xù)〕：空冷平臺以上局部的步道設(shè)在擋風墻外〔對減小各風向的熱風再循環(huán)有一定的效果〕Noteeffectofsolidwalkwayinpreventingrecirculation步道對防止熱風再循環(huán)的影響Feature4:34ft8-bladedlownoisefanvs34ft8-bladedstandardfan特點4：低噪聲風機〔34ft的8葉片〕與標準風機〔34ft的8葉片〕的比較Standardfan(similartoMatimbafan)標準風機〔類似于馬廷巴采用風機〕725mmchordlength弦長725mm15%pressuremargin15%風壓裕度Lownoisefan(Medupi)低噪聲風機〔米都比采用〕1250mmchordlength(+72%)弦長1250mm(增大72%)86%pressuremargin86%風壓裕度Feature4(cont.):34ft8-bladedlownoisefanvs34ft8-bladedstandardfan特點4〔續(xù)〕：用低噪音風機〔34ft的8葉片〕Notehigherairoutlettemperatureindicatingreducedairflowasaresultofcrossflowonleadingfans較高的風溫表示首排風機受橫切風影響導(dǎo)致該處冷卻空氣風量減少InclinedductdesignY型排汽管道布置(傾斜式管道布置)專利設(shè)計InclinedductdesignY型排汽管道布置專利設(shè)計專利技術(shù)侵權(quán)必究90°-GEAInnovation–-GEA的革新

-Ductroutingwithsoftangle

緩置90°

10-

30°10-30°SteamSteamBadsteamdistribution較差的蒸汽配送Highpressureloss較高的壓損“Past“過去GEA

PATENT

GEA

專利

Resultsofcomputeranimatedsteamflowsimulation蒸汽流動的計算機動畫仿真結(jié)果“GEAPresentPraxis““GEA專利實現(xiàn)〞Optimalsteamdistribution最優(yōu)的蒸汽配送Minimizedpressureloss壓損減至最低Improvementofsteamflow

蒸汽流動改善Easyandquickerection

簡易和快捷的安裝

Customerbenefitsduringfabrication,shippinganderection

fora2x600MWGEAAirCooledCondenser:

以一個2×600MWGEA空冷凝汽系統(tǒng)為例，列舉用戶在制造、運輸和安裝方面所獲得的效益:Figuresbelowshallbeusedasreferenceonly:

以下數(shù)值僅供參考:Savingofductmaterialincl.erectionlabour200ton2,000,000RMB

節(jié)省管材〔包括人工〕約200噸: Savingofplatformsteelstructure20ton節(jié)省平臺鋼結(jié)構(gòu)約20噸:170,000RMBSavingofshippingcost節(jié)省相應(yīng)運輸本錢: 60,000RMB ---------------------Totalcostsavingforcustomer/用戶方面總的本錢節(jié)省: 2,230,000RMBEnduserbenefitsofGEA’sACCGEA斜型管徑設(shè)計的益處:Minimizedpressurelosswithoptimumofsteamdistribution在最優(yōu)的蒸汽分布狀態(tài)下取得最小的蒸汽壓損ReducedcostofExhaustSteamDuctandshortererectiontime排汽管道本錢減少且安裝工期縮短BenefitsofGEA’sinclinedductrouting

GEA

斜型管徑設(shè)計的益處World-Wide/世界范圍: PowerPlant: Poweroutput: Ductdiameter: Country: Yearofconst.:

電站: 出力

: 管道直徑

: 國家

: 建設(shè)年份:Amorebieta 1x800MW 1xDN8000 Spain 2003Altomonte 1x770MW 1xDN7000 Italy 2003Voghera 1x400MW 1xDN5000 Italy 2003Candela 1x380MW 1xDN5200 Italy 2003Tynagh 1x400MW 1xDN5600 Ireland 2004KoganCreek 2x500MW 2xDN6000 Australia 2005Aluar 1x300MW 1xDN5600 Argentina 2006Catalagzi 1x150MW 1xDN5000 Turkey 2006Medupi

6x800MW South

Africa

在建WithinChina/中國國內(nèi):

PowerPlant: Poweroutput: Ductdiameter: Country: Yearofconst.: 電站: 出力

: 管道直徑

: 國家

: 建設(shè)年份:TuoketuoIII+IV 4x600MW 2xDN6000 China 2004/2006Taiyuan2 2x300MW 2xDN5500 China 2005Lingwu 2x600MW 2xDN6000 China 2005JinjieI+II 4x600MW 2xDN6000 China 2005/2007