回热系统运行状况对机组热经济性影响的定量分析  

Quantitative Analysis of Influence of Regenerative System Operating Condition on the Thermal Economy of Unit

作　　者：余兴刚 陈非 李旭 张柏林 宾谊沅 YU Xing-gang;CHEN Fei;LI Xu;ZHANG Bo-lin;BIN Yi-yuan(Hunan Province Key Laboratory of Efficient&Clean Thermal Power Generation Technologies(State Grid Hunan Electric Power Corporation Limited Research Institute),Changsha 410007,China;Hunan Xiangdian Test&Research Institute Company Limited,Changsha 410004,China)

机构地区：[1]高效清洁火力发电技术湖南省重点实验室(国网湖南省电力有限公司电力科学研究院),长沙410007 [2]湖南省湘电试验研究院有限公司,长沙410004

出　　处：《汽轮机技术》2021年第1期49-52,56,共5页Turbine Technology

基　　金：湖南省科技创新平台与人才计划(2016TP1027)。

摘　　要：基于机组热平衡图和改进弗留格尔公式,建立了汽轮机定功率变工况计算模型。以某超临界620MW机组为研究对象,75%THA工况和50%THA工况下典型参数的计算结果与设计值相比误差均小于1%。运用所建立的定功率变工况计算模型研究了THA、75%THA和50%THA工况下加热器端差、抽气管道压损、加热器旁路泄漏量以及加热器事故疏水泄漏量对机组热耗率的影响,得到了各工况下上述4组参数变化对机组热耗率影响的具体数值和变化规律,研究结果可用于定量估算机组回热系统运行状况变化对机组热耗率的影响数值,为机组节能诊断和检修工作提供了理论依据。A constant power variable condition calculating model was proposed based on heat balance diagram and modified Flügel formula.The variable condition calculating model was applied to a supercritical 620MW unit.The comparison of calculated results and designed values of typical parameters for 75%THA and 50%THA condition indicates the deviation is smaller than 1%.The influence of temperature difference of heaters,pressure loss of extraction steam pipes,leakage of heater bypass valves and leakage of heater emergency draining valves on the heat rate of unit for THA,75%THA and 50%THA condition has been investigated.The detailed values and variation law of the effect of above four parameters on heat rate were obtained.The results can be utilized to estimate the influence values of variation of regenerative system operating condition on the heat rate and provide theoretical basis for energy saving diagnosis and repair of unit.

关 键 词：定功率变工况计算模型 加热器端差 抽汽管道压损 加热器旁路泄漏量 事故疏水泄漏量 热耗率 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]