| 摘要 |
PURPOSE:To cool a gas turbine combustor effectively in a plant to drive a steam turbine by steam generated by an exhaust gas boiler formed by using gas turbine exhaust gas as a heat source. CONSTITUTION:A gas turbine combustor 2 is cooled by branching off a part of outlet steam of an intermediate pressure drum 12 of an exhaust gas boiler 4, and the steam whose temperature is raised in itself by cooling is introduced to an intermediate pressure steam turbine 17. Since a total quantity of outlet air of a compressor 1 can be used for combustion without using it for cooling the combustor 2, it can contribute to realization of high efficiency of a gas turbine. A steam extracting position (intermediate pressure drum) and a re-introducing position (intermediate pressure steam turbine) are optimum for a temperature or a pressure loss of the combustor 2 in both pressure and temperature.
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