Abstract: A gas turbine fuel supply system includes a fuel supply flow passage that includes a fuel gas heater which heats fuel and supplies the fuel heated by the fuel gas heater to a first nozzle and a second nozzle, a bypass flow passage that supplies the fuel to the first nozzle without passing through the fuel supply flow passage, and a bypass fuel flow rate adjusting valve that adjusts a flow rate of the fuel flowing in the bypass flow passage.

Abstract: A control system is configured to control a temperature of a fuel which is supplied to a combustor of a gas turbine via a fuel gas heater, which is configured to heat the fuel of the gas turbine, by adjusting a flow rate of heated water which is supplied to the fuel gas heater. The control system includes a water flow rate adjusting unit configured to adjust the flow rate of the heated water which is supplied to the fuel gas heater based on a difference between a target temperature of the fuel and the temperature of the fuel on an outlet side of the fuel gas heater.

Abstract: A gas turbine fuel supply system includes a fuel supply flow passage that includes a fuel gas heater which heats fuel and supplies the fuel heated by the fuel gas heater to a first nozzle and a second nozzle, a bypass flow passage that supplies the fuel to the first nozzle without passing through the fuel supply flow passage, and a bypass fuel flow rate adjusting valve that adjusts a flow rate of the fuel flowing in the bypass flow passage.

Abstract: A gas turbine combined cycle plant includes a fuel gas heater configured to heat fuel gas to be supplied to a combustor of a gas turbine using heated water heated by an exhaust heat recovery boiler; a return valve disposed on a heated water returning line to return heated water passing through the heater to the boiler; a dump valve disposed on a condensate line bifurcated from the heated water returning line between the return valve and the heater to return the heated water to a condenser; and a control unit configured to control operation of the return and dump valves. When load of the turbine falls below a lower limit, the control unit closes the return valve and keeps the opening degree of the dump valve at a specified degree to reduce a flow rate of the heated water flowing in the heater for a predetermined time.

Abstract: A gas turbine combined cycle plant includes a fuel gas heater configured to heat fuel gas to be supplied to a combustor of a gas turbine using heated water heated by an exhaust heat recovery boiler; a return valve disposed on a heated water returning line to return heated water passing through the heater to the boiler; a dump valve disposed on a condensate line bifurcated from the heated water returning line between the return valve and the heater to return the heated water to a condenser; and a control unit configured to control operation of the return and dump valves. When load of the turbine falls below a lower limit, the control unit closes the return valve and keeps the opening degree of the dump valve at a specified degree to reduce a flow rate of the heated water flowing in the heater for a predetermined time.

Abstract: A control system controls a temperature of a fuel which is supplied to a combustor of a gas turbine via a fuel gas heater, which heats the fuel of the gas turbine, by adjusting a flow rate of heated water which is supplied to the fuel gas heater. The control system includes a water flow rate adjusting unit that adjusts the flow rate of the heated water which is supplied to the fuel gas heater based on a difference between a target temperature of the fuel and the temperature of the fuel on an outlet side of the fuel gas heater.