Patent ID: 6085514
Filing Date: 2000-07-11
Classification: F01K,F02C,F05D,Y02E

Abstract:
A method of steam cooling a gas-turbine group, including a compressor unit, at least one combustion chamber having a bum-out zone, at least one turbine and at least one generator, said combustion chamber comprising a combustion zone and a discharge zone, said discharge zone located downstream of said combustion zone, whereby a fuel air mixture flowing through the combustion chamber is ignited and burnt inside said combustion zone, the air being injected exclusively with the fuel, and complete combustion is achieved at a downstream end of the combustion zone, and the combustion is completed when the hot gas resulting from the combustion process enters the discharge zone, the method comprising the steps of:extracting a quantity of steam from a steam source;cooling a wall of at least said one combustion chamber solely with said steam; andadmixing said steam after cooling of the combustion chamber has been performed, with said hot gas flowing in the combustion chamber in the discharge zone, exclusively downstream from the combustion zone, thus avoiding any affection of the combustion process by said steam.