Gas turbine control device, gas turbine, and gas turbine control method
A gas turbine control device according to at least one embodiment of the present disclosure comprises a purge gas flow rate control unit that controls the flow rate of purge gas for discharging fuel gas remaining inside the gas turbine to the outside of the gas turbine. The purge gas flow rate control unit controls the flow rate of the purge gas on the basis of a parameter related to the intake air quantity from a gas turbine inlet.
1 . A purge device of a gas turbine, comprising:
a purge gas system for supplying purge gas to a fuel pipe which supplies fuel gas to a combustor of the gas turbine, in order to discharge fuel gas remaining inside the fuel pipe to an outside of the gas turbine; and
a control device including a processor and a memory,
wherein using the memory, the processor controls a flow rate of the purge gas provided to the fuel pipe based on a parameter related to an intake air amount from a gas turbine inlet, and
wherein the parameter includes:
a parameter related to a gas turbine rotation speed; and
a parameter related to an opening degree of an inlet guide vane provided at the gas turbine inlet, and the parameter is a drive position of an actuator of the inlet guide vane or an inlet guide vane opening degree control command,
wherein using the memory, the processor controls the flow rate of the purge gas to not exceed an upper limit threshold value of the flow rate of the purge gas corresponding to the parameter related to the intake air amount,
wherein the upper limit threshold value of the flow rate of the pure gas is set, such that a concentration of the fuel gas inside the gas turbine remains less than a lower explosion limit of the fuel gas during a circulation period of the purge gas,
wherein the concentration of the fuel gas inside the gas turbine reaches a maximum value at the end of the circulation period of the purge gas when the purge gas is no longer provided to the fuel pipe.
2 . The purge device of the gas turbine according to claim 1 , wherein using the memory, the processor controls the flow rate of the purge gas such that the flow rate of the purge gas during the circulation period of the purge gas is constant.
3 . The purge device of the gas turbine according to claim 1 , wherein using the memory, the processor starts the control of the flow rate of the purge gas based on the parameter related to the intake air amount from the gas turbine inlet, in a case where tripping of the gas turbine is detected.
4 . A gas turbine comprising:
the purge device of the gas turbine according to claim 1 ;
a flow rate regulation valve that regulates the flow rate of the purge gas; and
a turbine that rotates with a combustion gas generated by combustion of the fuel gas.
5 . The purge device of the gas turbine control device according to claim 1 , wherein using the memory, the processor controls the flow rate of the purge gas to be the upper limit threshold value of the flow rate of the purge gas.
6 . A purge method for discharging fuel gas remaining inside a fuel pipe, which supplies the fuel gas to a combustor of a gas turbine, to an outside of the gas turbine, the purge method comprising:
controlling a flow rate of a purge gas supplied to the fuel pipe in order to discharge the fuel gas remaining inside the fuel pipe to the outside of the gas turbine, based on a parameter related to an intake air amount from a gas turbine inlet,
wherein the parameter includes:
a parameter related to a gas turbine rotation speed; and
a parameter related to an opening degree of an inlet guide vane provided at the gas turbine inlet, and the parameter is a drive position of an actuator of the inlet guide vane or an inlet guide vane opening degree control command,
controlling the flow rate of the purge gas to not exceed an upper limit threshold value of the flow rate of the purge gas corresponding to the parameter related to the intake air amount,
setting the upper limit threshold value of the flow rate of the purge gas, such that a concentration of the fuel gas inside the gas turbine remains less than a lower explosion limit of the fuel gas during a circulation period of the purge gas,
wherein the concentration of the fuel gas inside the gas turbine reaches a maximum value at the end of the circulation period of the purge gas when the purge gas is no longer provided to the fuel pipe.