直接空冷与间接空冷技术改进

EGICoolingSystemTrading〔Beijing〕Co.,Ltd.

亿吉埃冷却系统贸易〔北京〕

GEA集团GEA集团组织结构工艺过程技术能源与农业技术空气处理农业技术热能工程排放控制机械分离工艺工程制药设备制冷技术工艺设备直接空冷ACC间接空冷主讲人：彭纯

公司组织结构公司产品范围电站干式冷却系统空冷凝汽系统〔ACC〕湿式冷却系统自然通风冷却塔核电超大自然塔排烟式自然塔〔烟塔合一〕海水自然塔机械通风冷却塔辅助通风自然塔组合冷却系统干湿混合式却塔干湿并行冷却系统〔PAC〕GEA公司所创造的世界上第一套发电用直接空冷凝汽系统于1939年在德国鲁尔矿区投运，至今仍可运行南非马廷巴电厂〔6X665MW〕——目前世界上最大容量的空冷电厂空冷凝汽系统〔ACC〕MatimbaACClayout马廷巴电厂实拍〔1991〕Whatisrecirculation?热风再循环现象横向风倒灌纵向风旋涡AtMatimbaturbinetripswereexperiencedduringwesterlywinds(i.e.windscomingovertheboiler+turbinehalltowardstheACC.在马廷巴工程中,汽机跳闸发生在炉后来风的情况下AfterexhaustiveCFDworkontheMatimbaACCtheseproblemscouldbeascribedto:根据经过大量CFD研究，马廷巴的问题原因可以归结如下:Fansstallingduetohighcrossflowvelocitiesundertheouterfansofunits1to6ACC的外侧风机在下部横切风较大时，出现风机失速现象,从而导致风机出力下降。Poor‘breathing’oftheACCduetosmallairinletopeningsontheWsideoftheACC(turbinehallside)ACC与汽机房相隔太近，影响了该侧进风。RecirculationofhotairduringperiodswithWwinds炉后来风时存在热风再循环现象TheseproblemswiththeMatimbaACCwerealleviatedbymodifyingsomecladdingatturbinehallandACCtherebyincreasingairinlettoACC通过在汽机房外墙上开通风窗的措施，改善空冷岛进风状态，马廷巴电厂的上述问题得到一定程度的减轻。MedupiACCvsMatimbaACC米都比与马廷巴空冷岛参数比照MatimbaACCMedupiACCNumberofunits空冷岛台数6x665MW6x800MWNumberoffansperunit每台空冷单元数量4864Totalnumberoffans总风机数288384Fandiameter风机直径30ft34ftFantype风机类型StandardLownoisePlotarea空冷岛面积70.8mx509.5m(36071m2)108mx669m(72252m2)Deckheight空冷平台高43.5m54mNumberofexhauststeamducts主排汽管数量22Diameterofexhauststeamducts主排汽管直径5m6.2mDesignwindspeed(@40melev.)设计风速（40m标高处）0m/s9m/sMatimbaPSACC马廷巴空冷岛MedupiPSACC米都比空冷岛MedupiACClayout米都比空冷岛布置图〔数模分析〕Feature1:gapbetweentheturbinehallandtheACC(toimprove‘breathingofACCduringoperationwithWwind)特点1：增大空冷岛与汽机房间距〔改善炉后风占主导时的空冷岛进风情况〕gapFeature2:TheuseofawindcrossongroundlevelbelowtheACC(ensuresgoodairflowthoughthecompleteACCduringnon-Wwind)特点2：在空冷岛内内0米处设置十字交叉的导风板〔保证非炉后风时空冷岛进风状况〕，这种设计对无风状态无负面影响，也易于实现。Feature3:solidwalkwayaroundtheoutsideofwindwalls(reducesrecirculationforallwinddirections)特点3：空冷平台以上局部的步道设在挡风墙外〔减小各风向的热风再循环〕Feature3(cont.):solidwalkwayaroundtheoutsideofwindwalls(reducesrecirculationforallwinddirections)特点3〔续〕：空冷平台以上局部的步道设在挡风墙外〔对减小各风向的热风再循环有一定的效果〕Noteeffectofsolidwalkwayinpreventingrecirculation步道对防止热风再循环的影响Feature4:34ft8-bladedlownoisefanvs34ft8-bladedstandardfan特点4：低噪声风机〔34ft的8叶片〕与标准风机〔34ft的8叶片〕的比较Standardfan(similartoMatimbafan)标准风机〔类似于马廷巴采用风机〕725mmchordlength弦长725mm15%pressuremargin15%风压裕度Lownoisefan(Medupi)低噪声风机〔米都比采用〕1250mmchordlength(+72%)弦长1250mm(增大72%)86%pressuremargin86%风压裕度Feature4(cont.):34ft8-bladedlownoisefanvs34ft8-bladedstandardfan特点4〔续〕：用低噪音风机〔34ft的8叶片〕Notehigherairoutlettemperatureindicatingreducedairflowasaresultofcrossflowonleadingfans较高的风温表示首排风机受横切风影响导致该处冷却空气风量减少InclinedductdesignY型排汽管道布置(倾斜式管道布置)专利设计InclinedductdesignY型排汽管道布置专利设计专利技术侵权必究90°-GEAInnovation–-GEA的革新

-Ductroutingwithsoftangle

缓置90°

10-

30°10-30°SteamSteamBadsteamdistribution较差的蒸汽配送Highpressureloss较高的压损“Past“过去GEA

PATENT

GEA

专利

Resultsofcomputeranimatedsteamflowsimulation蒸汽流动的计算机动画仿真结果“GEAPresentPraxis““GEA专利实现〞Optimalsteamdistribution最优的蒸汽配送Minimizedpressureloss压损减至最低Improvementofsteamflow

蒸汽流动改善Easyandquickerection

简易和快捷的安装

Customerbenefitsduringfabrication,shippinganderection

fora2x600MWGEAAirCooledCondenser:

以一个2×600MWGEA空冷凝汽系统为例，列举用户在制造、运输和安装方面所获得的效益:Figuresbelowshallbeusedasreferenceonly:

以下数值仅供参考:Savingofductmaterialincl.erectionlabour200ton2,000,000RMB

节省管材〔包括人工〕约200吨: Savingofplatformsteelstructure20ton节省平台钢结构约20吨:170,000RMBSavingofshippingcost节省相应运输本钱: 60,000RMB ---------------------Totalcostsavingforcustomer/用户方面总的本钱节省: 2,230,000RMBEnduserbenefitsofGEA’sACCGEA斜型管径设计的益处:Minimizedpressurelosswithoptimumofsteamdistribution在最优的蒸汽分布状态下取得最小的蒸汽压损ReducedcostofExhaustSteamDuctandshortererectiontime排汽管道本钱减少且安装工期缩短BenefitsofGEA’sinclinedductrouting

GEA

斜型管径设计的益处World-Wide/世界范围: PowerPlant: Poweroutput: Ductdiameter: Country: Yearofconst.:

电站: 出力

: 管道直径

: 国家

: 建设年份: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/中国国内:

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

: 管道直径

: 国家

: 建设年份:TuoketuoIII+IV 4x600MW 2xDN6000 China 2004/2006Taiyuan2 2x300MW 2xDN5500 China 2005Lingwu 2x600MW 2xDN6000 China 2005JinjieI+II 4x600MW 2xDN6000 China 2005/2007