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《基于简化模型的回热系统性能实时监测.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第58卷第4期汽轮机技术Vol.58No.42016年8月TURBINETECHNOLOGYAug.2016基于简化模型的回热系统性能实时监测王惠杰,范志愿,许小刚,李鑫鑫,刘玉东(华北电力大学能源动力与机械工程学院,保定071003)摘要:回热系统是发电机组的主要辅助设备,实时监测回热系统的运行状况,对机组的安全性、经济性具有重要意义。由于在变工况条件下,电站回热加热器不同换热段的换热特性具有明显差异,且回热系统各参数具有鲜明的耦合关系。传统的回热系统传热计算过程复杂,致使回热系统的整体变工况特
2、性计算不易收敛,或精度降低。针对典型的三段式回热加热器建立了变工况简化计算模型,同时,以300MW机组的回热系统为例,结合疏水冷却段效能的简化计算方法与回热系统变工况的逆序算法进行了计算分析。计算结果表明模型精度较高,同时该模型具有对现场测点数据依赖度小、计算方法简单、速度快的优点,对回热系统性能监测以及机组热经济性诊断具有一定的参考价值。关键词:回热系统;简化模型;传热单元数;传热系数分类号:TK267文献标识码:A文章编号:1001-5884(2016)04-0309-05Real-timeM
3、onitoringofRegenerativeSystemPerformanceBasedonSimplifiedModeWANGHui-jie,FANZhi-yuan,XUXiao-gang,LIXin-xin,LIUYu-dong(SchoolofEnergyPowerandMechanicalEngineering,NorthChinaElectricPowerUniversity,Baoding071003,China)Abstract:Theregenerativesystemisthe
4、mainauxiliaryequipmentofpowerunit.Andithasimportantsignificanceforunit'ssecurityandeconomytomonitortheoperationstatusoftheheatrecoverysystem.Theheattransfercharacteristicsofthedifferentheatexchangesectionofthepowerstationareobviouslydifferent,andthepa
5、rametersoftheregenerativeheatingsystemhavedistinctcouplingrelationshipundervariableworkingconditions.Theintegralvariableconditioncharacteristicoftheregenerativesystemisnoteasytoconverge,andtheprecisionisreducedbecausetraditionalthecalculationprocessof
6、heattransferiscomplexinregenerativesystem.Asimplifiedcalculationmodelofvariableworkingconditionisestablishedfortypicalthreestageregenerativeheaterinthispaper.Combinedwiththehydrophobiccoolingsectioneffectivenessofsimplifiedcalculationmethodandregenera
7、tivesystemvariableconditionofreversealgorithm300MWunitregenerativesystemarecalculatedandanalyzed.Thecalculationresultsshowthatthemodelhasahighaccuracyandtheadvantagesofsmalldependenceonthespotmeasurementdata,simplecalculationmethodandfastspeed.Ithasso
8、mereferencevaluefortheperformancemonitoringoftheregenerativesystemandtheeconomicdiagnosisoftheunit.Keywords:heatregenerativesystem;simplifiedmodel;numberoftransferunits;heattransfercoefficient[6,7]效度应用在回热系统中,能够较为准确地确定各项指标。0前言但是,传热有效度的计算过程较为复杂,
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