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1、第35卷第4期中国电机工程学报Vol.35No.4Feb.20,20158982015年2月20日ProceedingsoftheCSEE©2015Chin.Soc.forElec.Eng.DOI:10.13334/j.0258-8013.pcsee.2015.04.017文章编号:0258-8013(2015)04-0898-08中图分类号:TK264防风网对空冷岛换热性能影响的数值模拟陈海平,仲雅娟,付浩然,孙见雨,郑伟(国家火力发电工程技术研究中心(华北电力大学),北京市昌平区102206)NumericalSimulationfortheEf
2、fectsofWindshieldonHeatTransferPerformanceofAir-cooledIslandCHENHaiping,ZHONGYajuan,FUHaoran,SUNJianyu,ZHENGWei(NationalThermalPowerEngineering&TechnologyResearchCentre(NorthChinaElectricityPowerUniversity),ChangpingDistrict,Beijing102206,China)ABSTRACT:Takingone2×300MWdirectai
3、r-cooledunitsin冷岛换热效率一般低于开孔率为25%、44%的换热效率;空domesticasanexample,theinfluencesofinstallingwindshield冷岛换热效率随着防风网高度的增大呈现先上升后下降的downalongair-cooledplatformontheheattransfer趋势,最优防风网结构是开孔率为25%、网高为12m。研performanceofair-cooledislandwerenumericallysimulated究结果为直接空冷机组加装合适结构的防风网提供了理论usings
4、oftwareFLUENT,andthevariationsofairflowfield依据。andtemperaturefieldneartheair-cooledislandafterinstalling关键词:防风网;空冷岛;换热性能;数值模拟windshieldwerecomparedandanalyzedrespectively.Theresultsshowthattheinstallationofwindshieldimprovesthe0引言air-cooledfanoutputintheconditionofhighwindspeed
5、,我国中西部富煤地区同时也是缺水地区,水资resiststheprocessofhotairrecirculation,andimprovesthe源短缺已经成为限制发电装机容量提高的主要瓶heattransferperformanceoftheair-cooledisland.Under[1]颈。直接空冷机组以其良好的节水性能,在国内differentspeedoftheboilersidewindandtheside-directionwind,theeffectofdifferentpermeableratesanddifferent外得到了广
6、泛的应用,这几年在我国得到了迅速发heightsofthewindshieldonheattransferefficiencywas展。直接空冷机组的冷端尤其是空气冷凝器的换热furtheranalyzed.Theresultsshow,theheattransferefficiency效率是影响空冷机组运行热效率的关键因素之ofair-cooledislandinstalledwithwindshieldofwhichthe[2]一。然而,空冷凝汽器布置在环境风场中,它通permeablerateis6%or13%isgenerallylowert
7、hanthatwhen过轴流风机强制通风,利用周围的空气作为冷却介thepermeablerateis25%or44%;Withtheincreaseofthe质对汽轮机排汽进行冷却,所以,环境风场必然会windshieldheight,theheattransferefficiencyofair-cooledislandincreasesfirstandthendecreases,andtheoptimal对空冷凝汽器的正常运行产生很大影响。很多学者[3-8]structureofthewindshieldisthatthepermeablerat
8、eis25%对此进行了很多研究,如顾志福等通过风洞试andtheheightis12m.Theresearc