DEVICE AND METHOD FOR CONTROLLING SUPPLY OF WATER MIST TO GAS TURBINE COMPRESSOR

PROBLEM TO BE SOLVED: To provide a device for humidifying air supplied to a compressor, by using a measured value of condition of air/water upstream and an already known air flow rate passing through a turbine. SOLUTION: For increasing an output from a gas turbine, water drop mist is blown into air upstream a gas turbine compressor inlet. Water has action lowering down a dry bulb temperature of air advancing into the compressor inlet. For supplying a water amount suited for the atmospheric condition expected, a plurality of pumps of different capacity are provided to supply water over a wide range of a water flow rate. A control device for the pump avoids the use of a preset temperature relating to inlet air obtained from a measured value taken downstream of water injection. When desired relative humidity of air advancing into a compressor is input by an operator, the control device determines a suitable water flow rate by using the following measurements, that is, a flow rate of dry air to the compressor, a flow rate of inlet water, a dew point temperature of inlet air, a dry bulb temperature of inlet air, and a temperature of inlet water.