Power generation plant
View Patent ↗A power-generation plant 10 including a gas turbine 11 ; a fuel-gas cooler 13 ; and an extraction line 24 that guides the fuel gas extracted from an intermediate stage of a fuel-gas compressor 12 to the fuel-gas cooler 13 ; a first level detector 61 that detects whether a level of the coolant accumulated at a bottom portion of the fuel-gas cooler 13 has reached a predetermined level; and a controller that stops the gas turbine 11 on the basis of a detection signal sent from the first level detector 61 and that outputs a command signal for stopping a coolant pump 53 that supplies the coolant to the spray nozzles 44 and 45.
1. A power-generation plant comprising:
a gas turbine that combusts fuel gas;
a fuel-gas cooler that cools the fuel gas, which is pressurized at a fuel-gas compressor and recirculated, with coolant sprayed from a spray nozzle;
an extraction line that guides the fuel gas extracted from an intermediate stage of the fuel-gas compressor to the fuel-gas cooler;
a first level detector that detects whether a level of the coolant accumulated at a bottom portion of the fuel-gas cooler has reached a predetermined level; and
a controller configured to stop the gas turbine on the basis of a detection signal sent from the first level detector and that outputs a command signal for stopping a coolant pump that supplies the coolant to the spray nozzle.
2. A power-generation plant according to claim 1 , further comprising:
a bypass line that guides the fuel gas, which is pressurized at the fuel-gas compressor and recirculated, to the fuel-gas cooler;
a second level detector that detects whether a level of the coolant accumulated in the bypass line has reached a predetermined level; and
a controller that stops the gas turbine on the basis of a detection signal sent from the second level detector and that outputs a command signal for stopping the coolant pump that supplies the coolant to the spray nozzle.
3. A power-generation plant according to claim 1 , further comprising:
a coolant pipe that supplies the coolant to the spray nozzle,
wherein the coolant pipe is provided with a bypass pipe that returns the coolant to the interior of the fuel-gas cooler by bypassing the spray nozzle.
4. A power-generation plant according to claim 3 , wherein a pipe leading to the spray nozzle is provided with a pressure detector for detecting the pressure of the coolant that passes through the pipe.
5. A method of stopping a power-generation plant including
a gas turbine that combusts fuel gas;
a fuel-gas cooler that cools the fuel gas, which is pressurized at a fuel-gas compressor and recirculated, with coolant sprayed from a spray nozzle; and
an extraction line that guides the fuel gas extracted from an intermediate stage of the fuel-gas compressor to the fuel-gas cooler,
the method comprising:
stopping the gas turbine when a level of the coolant accumulated at a bottom portion of the fuel-gas cooler has reached a predetermined level; and
stopping a coolant pump, which supplies the coolant to the spray nozzle.
6. A method of stopping a power-generation plant according to claim 5 , further comprising:
stopping the gas turbine when a level of the coolant accumulated in a bypass line that guides the fuel gas, which is pressurized at the fuel-gas compressor and recirculated, to the fuel-gas cooler has reached a predetermined level; and
stopping the coolant pump, which supplies the coolant to the spray nozzle.