| 摘要 |
PURPOSE:To decrease the temperature difference between a turbine rotor and a turbine casing and adequately secure the moving blade tip gap by feeding the high-temperature bleed air not cooled by an intermediate cooler to the turbine casing when the intermediate cooler fails. CONSTITUTION:After being cooled by an intermediate cooler, the compressor final stage bleed air is guided to a turbine rotor 8 and a turbine casing 11 in sequence as the cooling air and cools moving blades 9, 10 and stationary blades 12-14. In this case, when a failure occurs in the intermediate cooler 5, the outlet temperature of the intermediate cooler 5 rises, and this temperature rise is detected by a temperature detector 17. Selector valves 15, 16 are switched by a control device 18 based on the detected temperature signal, and the cooling air 6 and the compressor low pressure stage bleed air 7 are switched respectively to the compressor final stage bleed air of 400 deg.C, for example. Accordingly, the turbine casing 11 is heated in response to the temperature of the turbine rotor 8 which rises as the temperature of the intermediate cooler 5 rises.
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