Taking a triple pressure reheat HRSG in the gas-steam combined cycle as an example, a general expression of the steam turbine thermal efficiency to coupling parameter with the unfired HRSG is derived.

以三压有再热余热锅炉的燃气-蒸汽联合循环为例，推导出非补式余热锅炉型蒸汽轮机热效率关于耦合参数的关系式，在此基础上得到了燃气-蒸汽联合循环热效率关于耦合参数的关系式。

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