Patent ID: 6978623
Filing Date: 2005-12-27
Classification: F01D,F02C,F05D,Y02E

Abstract:
1. A gas turbine comprising: a high temperature member of the gas turbine which uses a gas turbine casing air and steam as cooling medium in a switching manner and which is provided therein with a cooling flow passage; a steam supply unit configured to supply cooling steam to the high temperature member; a casing air supplying unit which has an air temperature adjusting unit capable of adjusting air temperature of the gas turbine casing air supplied to the high temperature member by controlling at least one of a mixing ratio of air having different temperatures and a cooling amount of air; and a cooling medium switching unit which equalizes a casing air temperature and a steam temperature by the air temperature adjusting unit and then, which switches the cooling medium for the high temperature member from the casing air to the steam when a temperature difference between the casing air and the steam becomes within 15° C.