Abstract A gas and steam turbine plant has a gas turbine producing exhaust gas, a water-steam loop in which water is preheated at a given high pressure and subsequently evaporated, a steam turbine in the water-steam loop, and a steam generator through which the exhaust gas flows for generating steam for the steam turbine. The steam generator has at least one preheater connected to the water-steam loop and a high-pressure heater connected downstream of at least one preheater. The water-steam loop has a partial loop connected parallel to the at least one preheater outside the steam generator for carrying an adjustable throughput quantity. A heat exchanger is disposed in the steam generator in the vicinity of the at least one preheater for removing usable heat. A method for operating the plant includes preheating a partial quantity of the water to be preheated outside the steam generator at the given high pressure, and adjusting the partial quantity as a function of an available total water quantity and admixing the partial quantity with the water preheated in the steam generator.
A method for operating a gas and steam turbine plant having a gas turbine producing exhaust gas, a water-steam loop in which water is preheated at a given high pressure and subsequently evaporated, a steam turbine in the water-steam loop, and a steam generator through which the exhaust gas flows for generating steam for the steam turbine, which comprises: preheating a partial quantity of the water to be preheated outside the steam generator at the given high pressure, and adjusting the partial quantity as a function of an available total water quantity and admixing the partial quantity with the water preheated in the steam generator.
Claim 2
Independent Claim
105 words
A method for operating a gas and steam turbine plant having a gas turbine producing exhaust gas, a water-steam loop in which water is preheated at a given high pressure and subsequently evaporated, a steam turbine in the water-steam loop, and a steam generator through which the exhaust gas flows for generating steam for the steam turbine, which comprises: preheating a partial quantity of the water to be preheated outside the steam generator at the given high pressure, and adjusting the partial quantity as a function of an available total water quantity and admixing the partial quantity with the water preheated in the steam generator.
Claim 3
Dependent Claim
23 words
The method according to claim 1, which comprises preheating the adjustable partial quantity in indirect heat exchange with steam from the steam turbine.
Claim 4
Dependent Claim
62 words
The method according to claim 1, which comprises producing low-pressure steam and feeding the low pressure steam to a low-pressure part of the steam turbine, evaporating a further partial quantity of water of the water-steam loop at low pressure in the steam generator and admixing the further partial quantity with the low-pressure steam flowing to the low-pressure part of the steam turbine.