Patent ID: 6810675
Filing Date: 2004-11-02
Classification: F01K,Y02E

Abstract:
A method for operating a combined-cycle power station, the combined-cycle power station including at least one gas turbo group, at least one heat recovery steam generator, and at least one steam turbo group, with the gas turbo group including at least one compressor, at least one combustion chamber, and at least one gas turbine, the heat recovery steam generator having at least one pressure stage, and the steam turbo group including at least one steam turbine, and a supplemental firing being arranged in the gas turbo group exhaust gas path downstream of the gas turbine, the method comprising:compressing air in the compressor; supplying the compressed air to the combustion chamber; using the compressed air as combustion air thus producing a hot gas; passing said hot gas through the gas turbine; passing exhaust gas through the heat recovery steam generator; producing steam in the heat recovery steam generator; supplying said steam to the steam turbo group; immediately, rapidly, and temporarily maintaining an increase in the power output of the combined cycle power station, including: increasing the firing rate of the gas turbo group, including increasing the fuel supply to the gas turbo group thus increasing the power output of the gas turbo group; taking the supplemental firing into operation thus increasing the steam production; and subsequently reducing the power output of the gas turbo group to the same extent as the increased steam production becomes available as steam turbo group shaft power.