Multi-staged gas-turbine with steam cooling and feeding into the combustor

摘要

The operating procedure involves use of at least some of the steam generated by the boiler (14) for cooling thermally stressed structures of the gas-turbine set. The steam is taken from the boiler at different temperatures and pressures for this purpose. Superheated steam (15) is utilised to cool the high-pressure structures including the stator (21) of the first turbine (7) and the hot part (25) of the first combustion chamber (4). Intermediate- or medium-pressure steam (29) and flash steam (44) are taken to the low-pressure structures (32,36,46) of the second turbine (12) and the second combustion chamber (9).