Method and apparatus for regulating the steam temperature of the live steam or reheater steam in a combined-cycle power plant

A combined-cycle power plant operable under part load, comprising:

• a water/steam circuit including a fired boiler, a steam turbine connected to a steam output of the fired boiler, and a superheater arranged between the fired boiler and an input of the steam turbine for heating steam generated in the fired boiler to form live steam;
• a gas turbine set including a gas turbine;
• and
• a heat recovery steam generator arranged at a hot gas output of the gas turbine and connected to the water/steam circuit in such a way that steam generated in the heat recovery steam generator is admixed with the live steam,
• wherein during operation, live steam is generated in the heat recovery steam generator,
• the temperature of the live steam generated in the heat recovery steam generator is regulated to a temperature different than a temperature of the live steam from the superheater, and
• the live steam from the superheater is admixed with the live steam generated in the heat recovery steam generator by feeding the live steam generated in the heat recovery steam generator into the water/steam circuit between the superheater and the steam turbine to regulate the temperature of the live steam from the superheater.