| 摘要 |
The invention relates to a method for temporary increasing the power of a gas turbine (11), which is part of a combined-cycle power plant (10), wherein the exhaust gas of said gas turbine (11) is used in a heat recovery steam generator (13) to generate steam for a water/steam cycle including a steam turbine (12) with a high pressure steam turbine (20), an intermediate pressure steam turbine (21) and a low pressure steam turbine (22), whereby said method comprises the step of injecting steam from said water/steam cycle at a predetermined injection pressure into said gas turbine (11). The efficiency is improved by taking steam of a lower pressure than said predetermined injection pressure from said water/steam cycle, increasing the pressure of said steam taken from said water/steam cycle to said predetermined injection pressure by subjecting it in separate compressing means (14) to a compression step, and injecting said compressed steam into said gas turbine (11). Preferably, said separate compressing means (14) comprises at least one steamdriven ejector. |
