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本文就不改变蒸汽热力参数，只改变新蒸汽温度及同时改变新蒸汽温度和压力三方面论述了补燃对常规联合循环中蒸汽动力装置热效率的影响；接着从系数定义出发推导出补燃的简明经济评价准则。
In this paper, the effect of make up on the thermal efficiency of steam power plant in conventional combined cycle was discussed without changing the thermal parameters of steam, changing the temperature of new steam and changing the temperature and pressure of new steam at the same time. And then, the definition of make up was deduced from the definition of coefficient Economic evaluation criteria.