Patent ID: 11933197
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 9:
10. The method for starting up a combined cycle plant according to claim 9, further comprising:
a GT normal start-up step of, when a GT normal start-up mode in which the gas turbine is not started rapidly is received in the GT start-up mode reception step, increasing the output of the gas turbine to a rated output by supplying fuel to the gas turbine;
a steam admission step of, when a temperature of the steam from the waste heat recovery boiler reaches or exceeds a predetermined temperature, starting steam supply to the steam turbine;
a synchronization step of, after the steam admission step, when a rotational speed of the steam turbine reaches a rated rotational speed, synchronizing the generator to a power system; and
a steam pressure control step of, after the generator is synchronized, controlling a pressure of the steam flowing into the steam turbine so that the pressure of the steam flowing into the steam turbine increases according to a target pressure change pattern, wherein
in the GT normal start-up step, a flow rate of the fuel to be supplied to the gas turbine is adjusted before the output of the gas turbine reaches the rated output, so as to temporarily maintain the output of the gas turbine at a predetermined low output lower than the rated output.