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AssigneeHitachi, Ltd.
InventorsMotoaki Utamura, Shinichi Hoizumi, Yasushi Takeda, Toshihiko Sasaki, Hideaki Komatsu, Seiichi Kirikami, Takeshi Suzumura, Tetsuo Sasada, Takashi Ikeguchi, Shigehisa Sugita
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To improve the thermal efficiency when an exhaust heat recovery type combined cycle plant having a gas turbine and a steam turbine in combination is operated at a partial load, the gas turbine exhaust is recirculated and returned to the compressor, and the combustion temperature is prevented from being lowered at the partial load. Preferably, the temperature is maintained constant. In this way, the thermal efficiency during operation at partial load can be improved.
A thermal power plant, comprising:
A method of operating a thermal power plant, comprising the steps of:
An exhaust recirculation type gas turbine plant in which air compressed by a compressor is fed to a combustor to burn fuel so as to drive a gas turbine, and a part of the gas turbine exhaust gas is returned to a compressor inlet, comprising means for increasing the quantity of the gas turbine exhaust gas to be returned to the compressor inlet as a load of the gas turbine plant lowers to maintain a temperature of the gas turbine exhaust gas or a temperature of combustion gas at an inlet of the gas turbine at a constant level.
Dependencies are inferred from the claim text.