660 MW机组加热器端差对热经济性的影响  

The Effect of Terminal Temperature Difference of Heater in a 660 MW Unit on Heat Economy

作　　者：马一博 刘鑫屏[1] MA Yibo;LIU Xinping(School of Control and Computer Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学控制与计算机工程学院,保定071003

出　　处：《南方能源建设》2021年第1期93-99,共7页Southern Energy Construction

基　　金：国家重点研发计划“提升供热机组电出力调节能力的蒸汽系统流程改造”(2017YFB0902100);中央高校基本科研业务费专项资金资助项目“供热机组灵活性提升理论及工程技术研究”(2017MS132)。

摘　　要：[目的]加热器的端差是影响机组热经济性的主要原因之一,准确定量计算加热器端差对热经济性的影响具有十分重要的意义。[方法]将某660 MW机组作为研究对象,用等效热降法分别计算了THA、80%THA、60%THA和40%THA四种工况下各级加热器端差对热耗率的影响,并对比分析了同一级加热器的端差在不同工况下对热耗率的影响及其变化规律。[结果]结果表明,各工况下端差对热耗率影响较大是最后一级高加和2号低加,而且机组出力越大,同一级高加的端差对热耗率的影响逐渐变大,同一级低加的端差对热耗率的影响逐渐变小。[结论]研究结果有助于指导机组的实际运行,提高机组的热经济性。[Introduction]The heater’s terminal temperature difference is one of the main reasons that affect the heat economy of the unit.It has great significance to accurately and quantitatively calculate the effect of heater’s terminal temperature difference on heat economy.[Method]A 660 MW unit was taken as the research object,the equivalent heat drop method was used to calculate the effect of the heater’s terminal temperature difference on the heat rate under the four operating conditions of THA,80%THA,60%THA and 40%THA.The influence of the terminal temperature difference of the same stage heater on the heat rate under different working conditions and its changing law were analyzed.[Result]The results showed that the terminal temperature difference of the last stage high pressure heater and No.2 low pressure heater have a greater influence on the heat rate under various operating conditions.As the output of the unit increases,the effect of the terminal temperature difference of the same stage of high pressure heater on the heat rate gradually becomes larger,and the effect of the terminal temperature difference of the same stage of low pressure heater on the heat rate gradually becomes smaller.[Conclusion]The research results are helpful for guiding the actual operation of the unit and improving the thermal economy of the unit.

关 键 词：加热器 端差 热经济性 等效热降 热耗率 

分 类 号：TM611[电气工程—电力系统及自动化] TM621