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COMBINED CYCLE PLANT, CONTROL DEVICE THEREOF, AND STEAM TURBINE STARTUP METHOD

  • US 20200132032A1
  • Filed: 12/31/2019
  • Published: 04/30/2020
  • Est. Priority Date: 07/12/2016
  • Status: Active Grant
First Claim
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1. A method of starting up a combined cycle plant, the combined cycle plant comprising:

  • a gas turbine having a compressor, a combustor, and a turbine;

    a supplementary firing burner that raises a temperature of exhaust gas of the gas turbine;

    a heat recovery steam generator that generates steam using exhaust heat of the exhaust gas; and

    a steam turbine that is driven by steam generated by the heat recovery steam generator,the method comprising;

    changing both an output of the combustor and an output of the supplementary firing burner when an output of the combined cycle plant is to be changed; and

    selecting a first output change mode at startup of the steam turbine, and switching to a second output change mode after completion of warming up of the steam turbine,wherein in the first output change mode, the output of the combustor is changed and the output of the supplementary firing burner is held constant when the output of the combined cycle plant is to be changed,in the second output change mode, both the output of the combustor and the output of the supplementary firing burner are changed when the output of the combined cycle plant is to be changed, andthe first output change mode and the second output change mode are capable of being selectively switched according to a first switching signal.

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