초록 ▼

A combined cycle power plant includes a gas turbine, a steam turbine and a heat recovery steam generator having a duct burner for supplementary firing. In the unfired mode, gas turbine exhaust is used in the heat recovery steam generator for generating steam for the steam turbine. The power plant in

A combined cycle power plant includes a gas turbine, a steam turbine and a heat recovery steam generator having a duct burner for supplementary firing. In the unfired mode, gas turbine exhaust is used in the heat recovery steam generator for generating steam for the steam turbine. The power plant includes a main steam output line from the heat recovery steam generator connected to the first stage inlet of the high pressure section of the steam turbine. A bypass loop is connected either to an intermediate pressure connection of the HRSG or from the high pressure line to an admission point downstream of the high pressure inlet nozzle, at a lower pressure than the nominal inlet pressure. By operating the bypass system in conjunction with the duct burning process in the HRSG, the steam inlet pressure to the steam turbine can be maintained at the optimal level during both fired and unfired operation of the HRSG. Another potential benefit is a higher output during fired operation than could otherwise be accomplished with a given steam turbine.

대표청구항 ▼

1. A combined cycle power plant comprising:a gas turbine driving a first generator; a steam turbine driving a second generator, said steam turbine having a low pressure section, an intermediate pressure section and a high pressure section; a heat recovery steam generator arranged to receive exhaust

1. A combined cycle power plant comprising:a gas turbine driving a first generator; a steam turbine driving a second generator, said steam turbine having a low pressure section, an intermediate pressure section and a high pressure section; a heat recovery steam generator arranged to receive exhaust gas from said gas turbine and condensate from said steam turbine, and to utilize the exhaust gas from said gas turbine to convert condensate from said steam turbine back to steam, said heat recovery steam generator having means for supplying steam to the high pressure, intermediate pressure and low pressure sections of the steam turbine; said heat recovery steam generator further comprising a duct burner for providing heat required to generate supplemental steam in said heat recovery steam generator for said steam turbine; and means for supplying said supplemental steam to said steam turbine downstream of a high pressure inlet to said high pressure section.