应用等效热降理论,对热经济性进行了定量计算分析。350MW机组实例计算表明,汽动给水泵系统小机高压进汽系数仅为0.001(即内漏1.07t/h)所引起的循环效率降低,相当于小机内效率下降0.96%,给水再循环系数0.01(即内漏10.7t/h)所造成的循环效率降低,相当于给水泵效率下降0.86%,凸现了阀门管理的重要性。 The equivalent thermal drop theory is applied to quantitatively analyze the thermal economy. The calculation of 350MW unit shows that the cycle efficiency of the steam-driven feed pump system is only 0.001 (ie, the internal leakage is 1.07t / h), which is equivalent to a decrease of 0.96% in the efficiency of the small machine. The feedwater recirculation coefficient 0.01 (ie, 10.7t / h leakage) caused by the lower efficiency of the cycle, equivalent to a 0.86% decrease in efficiency of the pump, highlights the importance of valve management.