Patent ID: 6578363
Filing Date: 2003-06-17
Classification: F01D,F02C

Abstract:
An air-cooled gas turbine exhaust casing containing an exhaust diffuser and connected to a turbine casing having turbine stages each including turbine stator blades and rotor blades, the exhaust casing being provided with cooling air passages disposed within the casing wall and extending in the axial direction, wherein the cooling air passages include:cooling air inlets disposed near the downstream end of the exhaust casing, cooling air outlets disposed near the upstream end of the exhaust casing and connected to an annular cavity formed between a stator ring holding the stator blades of the last turbine stage and the inner surface of the turbine casing wall, whereby cooling air enters into the cooling air passages at the portion near the downstream end of the exhaust casing, flows within the exhaust casing wall toward the upstream end of the exhaust casing and enters the annular cavity of the last turbine stage from the downstream end of the turbine casing.