Patent ID: RE39092

Claim:
A gas turbine having a compressor for compressing air supplied thereto and discharging the compressed air, a combustor for combusting the compressed air from said compressor and a fuel and a gas turbine to be driven by a combustion gas from said combustor, comprising: an injection unit, arranged within an intake air duct at an upstream side of said compressor and constructed so that water droplets are sprayed into the air to be supplied to the compressor to decrease the temperature of the air to be supplied into said compressor to a temperature lower than an atmospheric temperature and the sprayed water droplets introduced into said compressor with the air having been decreased in temperature are evaporated during passage through said compressor; a NOx concentration detection unit for detecting NOx concentration in said combustion gas; a pressure variation detecting unit for detecting pressure variation in said combustor; and a controlling unit for controlling a quantity of spray of said water droplets so as to suppress the NOx concentration and the pressure variation in said combustor to be in allowable value ranges, respectively.