| 摘要 |
PROBLEM TO BE SOLVED: To provide a residual steam removing mechanism of the steam cooling piping of a gas turbine capable of removing residual gas reliably and promptly when the gas turbine is stopped. SOLUTION: A combustor 10 is provided with steam cooling piping 11, and steam is fed from steam supply piping 20 to the steam cooling piping 11 to steam discharge piping 70, and thus nitrogn 10 is cooled by the steam. When the gas turbine stops, a piping system is kept such that valves V73, V71, V51, etc. are closed, and the piping 20, 11 and 70 are enclosed. Then, the valve V71 is opened, the piping are evacuated by a condenser 90, and subsequently the valve V71 is closed, the valve V51 is opened, nitrogen is filled to the piping 20, 11, and 70, and subsequently the valve V51 is closed. Thereby, residual steam in the steam cooling piping 11 is surely removed, to allow replacement with nitrogen. COPYRIGHT: (C)2007,JPO&INPIT
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