Method for setting or regulating the steam temperature of the live steam and/or reheater steam in a combined-cycle power plant and combined-cycle power plant for carrying out the method

摘要

In a method for setting or regulating the steam temperature of the live steam and/or reheater steam, in particular under part load, in a combined-cycle power plant (22) which comprises a water/steam cycle (20), in particular with a steam turbine (38), with a fired boiler (50) and with means (42, 51) for superheating or reheating the steam generated in the boiler (50) to form live steam or reheater steam, and also a gas turbine set (23) with a downstream heat recovery steam generator (28), the heat recovery steam generator (28) being connected to the water/steam cycle (20) in such a way that steam generated in the heat recovery steam generator (28) is admixed with the live steam or reheater steam, improved part-load behavior is achieved in that the steam temperature of the live steam and/or reheater steam is set or regulated by setting or regulating the steam temperature of the steam generated in the heat recovery steam generator (28).