| 摘要 |
The invention provides a gas turbine installation, a cooling air supplying method, a method of modifying a gas turbine installation, which can reduce the amount of compressed air extracted for cooling of an exhaust plenum and which can increase energy efficiency. The gas turbine installation comprises an exhaust plenum (8) comprising an exhaust casing (10) connected to the downstream side of a turbine (3) and made up of an outer casing (10a) and an inner casing (10b), and an exhaust diffuser (11) made up of an outer diffuser (11a) and an inner diffuser (11b), which are disposed between the outer casing (10a) and the inner casing (10b); a first cooling system (f; 37) for introducing, from the outer peripheral side of the outer diffuser (11b), cooling air for cooling the exhaust plenum (8); and a second cooling system (h; 40) for introducing, from the inner peripheral side of the inner diffuser (11b), cooling air for cooling the exhaust plenum (8). |
