Patent ID: 6311474
Filing Date: 2001-11-06
Classification: F01D,F02C,F05D

Abstract:
A combined cycle power plant having a gas turbine plant and a steam turbine plant combined together, the combined cycle power plant comprising:an exhaust heat recovery boiler for generating steam for driving the steam turbine by using exhaust heat from the gas turbine;a combustor provided for the gas turbine and having a high temperature compartment surrounding the combustor; anda steam cooling system for cooling the high-temperature compartment of the combustor by using the steam, where superheated steam from the steam cooling system is recovered and used in the steam turbine,wherein the combined cycle power plant has an air duct connected to a steam path for supplying steam for cooling the high-temperature compartment of the combustor and provided for cooling the high-temperature compartment by extracting and supplying air from compressed air in a turbine chamber surrounding the combustor when the steam for cooling is insufficient, and the air duct including a booster for boosting the air to have a pressure higher than a pressure inside said combustor.