Combined cycle plant, method for reducing minimum output thereof, and control device therefor
AssigneeMitsubishi Power, Ltd.
InventorAtsushi Kubota
Life of this patent
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Abstract
A control device includes a reception unit configured to receive a load schedule indicating a load in the future of a combined cycle plant, a steam temperature control unit configured to control a temperature of steam flowing into a steam turbine, and a fuel control unit configured to control a flow rate of fuel supplied to a gas turbine. The steam temperature control unit is configured to output a command indicating an amount of operation for decreasing the temperature of the steam to a steam temperature regulator prior to a load decrease time at which the load is to be decreased in the load schedule.
Claims18
A method for operating a combined cycle plant including a gas turbine that is driven using combustion gas, an exhaust heat recovery boiler that generates steam using heat of exhaust gas discharged from the gas turbine, and a steam turbine that is driven using the steam, the method comprising:
- a reception step of a control device receiving a load schedule indicating a load of the combined cycle plant;
- a decrease time-setting step of the control device recognizing a load decrease time at which the load is to be decreased with reference to the load schedule received in the reception step and setting a time prior to the load decrease time as a temperature decrease time at which a temperature of the steam supplied to the steam turbine is to be decreased;
- a temperature-decreasing step of decreasing the temperature of the steam supplied to the steam turbine at the temperature decrease time by spraying water into the steam;
- and
- a gas turbine output-decreasing step of decreasing an amount of fuel supplied to the gas turbine at the load decrease time.
A control device for a combined cycle plant including a gas turbine configured to be driven using combustion gas, a fuel regulator configured to regulate a flow rate of fuel supplied to the gas turbine, an exhaust heat recovery boiler configured to generate steam using heat of exhaust gas discharged from the gas turbine, a steam turbine configured to be driven using the steam, and a steam temperature regulator configured to regulate a temperature of the steam, the control device comprising:
- a reception unit configured to receive a load schedule indicating a load of the combined cycle plant;
- a steam temperature control unit configured to output a command indicating an amount of water sprayed into the steam for decreasing the temperature of the steam to the steam temperature regulator prior to a load decrease time at which the load is to be decreased in the load schedule;
- and
- a fuel control unit configured to output a command indicating an amount of operation for reducing an amount of supplied fuel at the load decrease time to the fuel regulator.
Dependencies are inferred from the claim text.