Patent ID: RE38831

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: a premixer provided in said combustor for burning premixed gas formed by premixing fuel and air; 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; and a controlling unit for controlling an adiabatic efficiency of said compressor and controlling a quantity of water spray on the basis of the adiabatic efficiency, during operation of spraying water droplets.