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US 10,883,378 B2Granted
Combined cycle plant and method for controlling operation of combine cycle plant
AssigneeMitsubishi Power, Ltd.
InventorAtsushi Kubota
Life of this patent
Estimating the term…
Abstract
A gas turbine combined cycle (GTCC) power generation plant (100) equipped with a control unit which performs a load reduction following operation with respect to a fuel adjustment valve (Vd), a main steam valve (V1), and a bypass valve (V4), wherein, when a load reduction request for reducing a GTCC load target value has been input in a closed bypass operation, the degree of opening of the fuel adjustment valve (Vd) is reduced in accordance with the target value while the main steam valve (V1) is in an open state, and the bypass valve (V4) is placed in an open state, after which the bypass valve (V4) is placed in the closed state when the GTCC load reaches the target value.
Claims15
A combined cycle plant comprising:
- a gas turbine including a compressor which compresses air, a combustor to which fuel is supplied from a fuel supply line so as to combust the air compressed by the compressor, and a turbine which is rotated using combustion gas generated by the combustor, and in which a fuel regulating valve for regulating a fuel supply amount is disposed in the fuel supply line;
- a heat recovery steam generator that generates steam by recovering heat of exhaust gas discharged from the gas turbine;
- a steam turbine that is rotated using the steam generated by the heat recovery steam generator;
- a main steam line that supplies the steam generated by the heat recovery steam generator to the steam turbine;
- a main steam valve that is disposed in the main steam line so as to regulate a circulation amount of the steam;
- a bypass line that is branched from the main steam line, and that is connected to a downstream side of the steam turbine in a flowing direction of the steam;
- a bypass valve that is disposed in the bypass line so as to regulate the circulation amount of the steam;
- and
- a control unit that controls the fuel regulating valve, the main steam valve, and the bypass valve to:
- perform a bypass closing operation for bringing the main steam valve into an open state to have a predetermined degree of opening, setting an opening degree of the fuel regulating valve to an opening degree according to a target value of a total load of the gas turbine and the steam turbine, and bringing the bypass valve into a closed state, and
- perform a decreasing load following operation for maintaining the main steam valve in the open state with the predetermined degree of opening while bringing the bypass valve into an open state while the main steam valve is in the open state with the predetermined degree of opening in a case where a load decreasing request to decrease the target value of the total load is input, in the bypass closing operation, decreasing the opening degree of the fuel regulating valve in accordance with the target value, and bringing the bypass valve into a closed state while the main steam valve is in the open state with the predetermined degree of opening in a case where the total load reaches the target value after the bypass valve is brought into the open state.
8 more elements
A combined cycle plant comprising:
- a gas turbine that has a compressor which compresses air, a combustor to which fuel is supplied from a fuel supply line so as to combust the air compressed by the compressor, and a turbine which is rotated using combustion gas generated by the combustor, and in which a fuel regulating valve for regulating a fuel supply amount is disposed in the fuel supply line;
- a heat recovery steam generator that generates steam by recovering heat of exhaust gas discharged from the gas turbine;
- a steam turbine that is rotated using the steam generated by the heat recovery steam generator;
- a main steam line that supplies the steam generated by the heat recovery steam generator to the steam turbine;
- a main steam valve that is disposed in the main steam line so as to regulate a circulation amount of the steam;
- a bypass line that is branched from the main steam line, and that is connected to a downstream side of the steam turbine in a flowing direction of the steam;
- a bypass valve that is disposed in the bypass line so as to regulate the circulation amount of the steam;
- and
- a control unit that controls the fuel regulating valve, the main steam valve, and the bypass valve to:
- perform a bypass closing operation for bringing the main steam valve into an open state, setting an opening degree of the fuel regulating valve to an opening degree according to a target value of a total load of the gas turbine and the steam turbine, and bringing the bypass valve into a closed state, and to
- perform an increasing load following operation for waiting for an input of a load increasing request after bringing the main steam valve into an open state and bringing the bypass valve into an open state, in the bypass closing operation, in a case where the load increasing request to increase the target value of the total load is input, increasing the opening degree of the fuel regulating valve in accordance with the target value after the load increasing request is input, and bringing the bypass valve into a closed state.
8 more elements
A method for controlling an operation of a combined cycle plant, the combined cycle plant including
- a gas turbine that has a compressor which compresses air, a combustor to which fuel is supplied from a fuel supply line so as to combust the air compressed by the compressor, and a turbine which is rotated using combustion gas generated by the combustor, and in which a fuel regulating valve for regulating a fuel supply amount is disposed in the fuel supply line,
- a heat recovery steam generator that generates steam by recovering heat of exhaust gas discharged from the gas turbine,
- a steam turbine that is rotated using the steam generated by the heat recovery steam generator,
- a main steam line that supplies the steam generated by the heat recovery steam generator to the steam turbine,
- a main steam valve that is disposed in the main steam line so as to regulate a circulation amount of the steam,
- a bypass line that is branched from the main steam line, and that is connected to a downstream side of the steam turbine in a flowing direction of the steam, and
- a bypass valve that is disposed in the bypass line so as to regulate the circulation amount of the steam,
- the method comprising:
- performing a bypass closing operation for bringing the main steam valve into an open state to have a predetermined degree of opening, setting an opening degree of the fuel regulating valve to an opening degree according to a target value of a total load of the gas turbine and the steam turbine, and bringing the bypass valve into a closed state;
- and
- performing a decreasing load following operation for maintaining the main steam valve in the open state with the predetermined degree of opening while bringing the bypass valve into an open state while the main steam valve is in the open state with the predetermined degree of opening in a case where a load decreasing request to decrease the target value of the total load is input in the bypass closing operation, decreasing the opening degree of the fuel regulating valve in accordance with the target value, and bringing the bypass valve into a closed state while the main steam valve is in the open state with the predetermined degree of opening in a case where the total load reaches the target value after the bypass valve is brought into the open state.
8 more elements
A method for controlling an operation of a combined cycle plant, the combined cycle plant including
- a gas turbine that has a compressor which compresses air, a combustor to which fuel is supplied from a fuel supply line so as to combust the air compressed by the compressor, and a turbine which is rotated using combustion gas generated by the combustor, and in which a fuel regulating valve for regulating a fuel supply amount is disposed in the fuel supply line,
- a heat recovery steam generator that generates steam by recovering heat of exhaust gas discharged from the gas turbine,
- a steam turbine that is rotated using the steam generated by the heat recovery steam generator,
- a main steam line that supplies the steam generated by the heat recovery steam generator to the steam turbine,
- a main steam valve that is disposed in the main steam line so as to regulate a circulation amount of the steam,
- a bypass line that is branched from the main steam line, and that is connected to a downstream side of the steam turbine in a flowing direction of the steam, and
- a bypass valve that is disposed in the bypass line so as to regulate the circulation amount of the steam,
- the method comprising:
- performing a bypass closing operation for bringing the main steam valve into an open state, setting an opening degree of the fuel regulating valve to an opening degree according to a target value of a total load of the gas turbine and the steam turbine, and bringing the bypass valve into a closed state;
- and
- performing an increasing load following operation for waiting for an input of a load increasing request after bringing the main steam valve into an open state and bringing the bypass valve into an open state, in the bypass closing operation, in a case where the load increasing request to increase the target value of the total load is input, increasing the opening degree of the fuel regulating valve in accordance with the target value after the load increasing request is input, and bringing the bypass valve into a closed state.
8 more elements
Dependencies are inferred from the claim text.