Combined cycle gas turbine plant comprising a waste heat steam generator and fuel preheating step
AssigneeSiemens Aktiengesellschaft
InventorsJan Brückner, Frank Thomas
Life of this patent
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Abstract
A combined cycle gas turbine plant and a corresponding method for operating such a combined cycle gas turbine plant, in which, during load operation of the combined cycle gas turbine plant, a water mass flow which is supplied according to the forced-flow principle to a waste heat steam generator is adjusted such that the evaporator heating surface of the medium pressure stage is oversupplied and thus a defined amount of excess water, which is heated in the evaporator heating surface but not vaporized, is discharged via the water-steam separator to a heat exchanger circuit for preheating fuel for the gas turbine.
Claims3
A combined cycle power plant comprising:
- a waste heat steam generator that has a multiplicity of heating surfaces which are arranged in the exhaust gas duct of the gas turbine and are connected to one another to form a three-stage pressure system, comprising a low-pressure stage, an intermediate-pressure stage and a high-pressure stage for the water-steam circuit of the steam turbine,
- wherein each of the pressure stages has in each case at least one heating surface for preheating, for evaporating and for superheating, and wherein a water-steam separator, which is arranged between the outlet of the evaporator heating surface and the inlet of the superheater heating surface of the intermediate-pressure stage and in which excess water can be separated from the steam, is provided with a branching-off line for diverting the excess water,
- wherein the branching-off line is connected to a heat exchanger circuit for preheating the fuel for the gas turbine such that a defined quantity of excess water separated in the water-steam separator is introduced into the heat exchanger circuit.
Dependencies are inferred from the claim text.