Patent ID: 7603840

Claim:
An LNG power plant comprising: (a) a gas turbine power generation unit having a gas turbine and a power generator; (b) an LNG vaporization facility configured to feed vaporized LNG as a fuel gas to the gas turbine power generation unit; (c) a gas feed pipe extended from the LNG vaporization facility to the gas turbine power generation unit; (d) a fuel gas heating/cooling device disposed between the LNG vaporization facility and the gas turbine power generation unit on the gas feed pipe, configured to heat and cool fuel gas introduced into the gas turbine power generation unit; (e) a heating value detector configured to detect a heating value of the fuel gas; (f) a temperature detector attached on the gas feed pipe between the fuel gas heating/cooling device and the gas turbine power generation unit configured to detect a temperature of the fuel gas; and (g) a temperature control device of the fuel gas heating/cooling device configured to control temperature of the fuel gas supplied to the gas turbine power generation unit, the temperature control device having: a target temperature calculator connected to the heating value detector configured to receive a heating value of the fuel gas and calculate a target temperature of the fuel gas introduced to the gas turbine power generation unit; and a command generator connected to the target temperature calculator and the fuel gas heating/cooling device configured to receive the target temperature and a signal of temperature of the fuel gas detected by the temperature detector and generate a command to control the fuel gas heating/cooling device by comparing the target temperature and the temperature of the fuel gas.