DEVICE FOR COOLING THE GAS-TURBINE COOLANT IN A COMBINED GAS AND STEAM TURBINE INSTALLATION
The invention concerns a combined gas and steam turbine installation including a waste-heat steam generator (6) connected to the gas turbine (2), the heating surfaces (12, 14, 16) of the steam generator (6) forming part of the water/steam circuit (8) of the steam turbine (10). In order to ensure efficient gas-turbine cooling and particularly efficient utilization of the heat thus obtained to give an installation with a high overall efficiency, the invention proposes that an intermediate circuit (34) is provided for coolant cooling, the intermediate circuit (34) being connected to a first heat exchanger (36) designed to cool the coolant (L) and to a second heat exchanger (32), connected into the water/steam circuit (8), which is designed to transfer the heat thus obtained.