Combined gas turbine and steam turbine power station

Combined gas turbine and steam turbine power station with steam-cooled gas turbine components, in which power station the cooling steam is generated outside the gas turbine (1, 2, 3), in a waste heat boiler (7), and wherein the following features are combined:

• (a) the waste heat from the gas turbine is utilized in a two-pressure waste heat boiler (7), which comprises a low-pressure section (7") and a high-pressure section (7');
• (b) the steam which is generated in the low-pressure evaporator (9) of the waste heat boiler (7), is slightly superheated in a cooling-steam superheater (10), which is located, on the exhaust gas side, between the intermediate superheater (13) and the low-pressure evaporator (9);
• (c) this cooling steam is forcibly led, on the one hand, in the gas turbine casing and hollow inlet vanes (43) and, on the other hand and separated therefrom, in the rotor (49) and hollow rotor blades (42), this steam cooling the components through which it flows, and being strongly superheated on being bled off;
• (d) the steam, which is partially expanded in the high-pressure section (26) of the steam turbine (27), is heated up, in the waste heat boiler (7), in an intermediate superheater (13) which is located, on the exhaust gas side, between the high-pressure preheater (11) and the cooling steam superheater (10), and is led, together with the steam which has been bled from the gas turbine (3), into the correspondingly enlarged low-pressure section of the steam turbine (27) in order to be further expanded.