_大型热电联产机组高背压供热改造全工况热经济分析

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1、第37卷第4期电力建设Vol.37，No.42016年4月ElectricPowerConstructionApr．，2016大型热电联产机组高背压供热改造全工况热经济分析万燕，孙诗梦，戈志华，何坚忍(电站设备状态监测与控制教育部重点实验室(华北电力大学)，北京市102206)摘要:抽凝供热机组抽汽参数往往高于热网所需，热损失大。高背压供热机组利用排汽余热供热，增加供热能力，减少供热抽汽量。单转子运行和双转子互换是大型汽轮机高背压供热改造的2种主流方式，为研究不同方式的经济性和适用性，以某350MW机组为例，采用Ebsilon仿真软件建

2、立高背压供热汽轮机变工况计算模型。结合单耗理论进行不同改造方式下供热季与非供热季经济性及能耗对比。结果表明:和单转子方式相比，双转子互换方式在供热季发电量多200万kW·h，平均发电煤耗低0.24g/(kW·h)，最大供热量少6.48MW，非供热季其效率高于单转子方式。但考虑到双转子互换方式供热季优势并不明显，且每年需要2次更换转子，因此对于大型热电联产机组高背压供热改造首选单转子方式，以降低成本。关键词:热电联产;供热改造;高背压;单转子;双转子互换;全工况Thermo-EconomicAnalysisofHighBackPressu

3、reHeatingＲetrofitforLarge-ScaleCogenerationUnitunderFullConditionWANYan，SUNShimeng，GEZhihua，HEJianren(KeyLaboratoryofConditionMonitoringandControlforPowerPlantEquipmentofMinistryofEducation，NorthChinaElectricPowerUniversity，Beijing102206，China)ABSTＲACT:Extractionsteampar

4、ametersofextractioncondensateheatingunitareoftenhigherthantheheatingnetworkrequired，whichresultedinagreatlossofheat．Highbackpressureunitmakesuseofexhaustheatforheating，thusincreasingheatingcapacityandreducingheatingsteamextraction．Therearetwomainmethodsofhighbackpressure

5、heatingretrofitforlargesteamturbine，whicharesingle-rotormodeanddouble-rotorinterchangemode．Forthestudyofdifferentformsofeconomyandapplicability，takinga350MWunitasanexample，thispaperconstructsanoff-designcalculationmodelofhighbackpressureheatingturbineusingEbsilonsimulati

6、onsoftware．Wecomparativelyanalyzetheeconomicefficiencyandenergyconsumptioninheatingseasonandnon-heatingseasonundertwomodesbasedonthetheoryofunitfuelconsumption．Theresultsshowthatinheatingseason，theelectricityoutputofdouble-rotorinterchangemodeis2000MW·hhigher，theaveragec

7、oalconsumptionrateis0.24g/kW·hlowerandthemaximumheatingcapacityis6.48MWlowercomparedwiththatofsinglerotormode．Innon-heatingseason，theexergyefficiencyofdouble-rotorinterchangemodeisbetterthanthatofsingle-rotormode．However，theadvantageofdouble-rotorinterchangemodeinheating

8、seasonisnotobviousanddouble-rotorinterchangemoderequiresreplacingrotortwiceayear．Therefore，inordertored