Humid air turbine, humid air turbine control system, and humid air turbine control method

A humid air turbine control system having a compressor for compressing air, a humidificator for generating humid air by adding moisture to compressed air supplied from the compressor, a combustor for generating combustion gas by allowing the humid air and fuel to mix and burn, a turbine driven by the combustion gas, a recuperator for effecting heat exchange between exhaust from the turbine and the humid air, an economizer for effecting heat exchange between exhaust from the recuperator and water, a temperature measurement device for measuring the temperature of exhaust discharged from the economizer, and a system for supplying the water heated by the economizer to the humidificator, the humid air turbine control system comprising:

• a first controller for calculating a fuel flow rate in accordance with a load demand for the humid air turbine and a power generation amount;
• and
• a second controller for adjusting an amount of moisture to be supplied to the humidificator so that a temperature of the combustion gas in the combustor remains substantially constant in accordance with the temperature of exhaust located downstream of the economizer and the fuel flow rate.

A method for controlling a humid air turbine having a compressor for compressing air, a humidificator for generating humid air by adding moisture to compressed air supplied from the compressor, a combustor for generating combustion gas by allowing the humid air and fuel to mix and burn, a turbine driven by the combustion gas, a recuperator for effecting heat exchange between exhaust from the turbine and the humid air, an economizer for effecting heat exchange between exhaust from the recuperator and water, and a system for supplying the water heated by the economizer to the humidificator, comprising:

• adjusting an amount of water to be supplied from the economizer to the humidificator so that a temperature of the combustion gas in the combustor remains substantially constant at a preset load increase rate.

A method for controlling a humid air turbine having a compressor for compressing air, a humidificator for generating humid air by adding moisture to compressed air supplied from the compressor, a combustor for generating combustion gas by allowing the humid air and fuel to mix and burn, a turbine driven by the combustion gas, a recuperator for effecting heat exchange between exhaust from the turbine and the humid air, an economizer for effecting heat exchange between exhaust from the recuperator and water, and a system for supplying the water heated by the economizer to the humidificator, comprising:

• precalculating a rate of increase in an amount of water to be supplied from the economizer to the humidificator;
• and
• adjusting said rate of increase in the amount of water so that a temperature of the combustion gas in the combustor remains substantially constant at a preset load increase rate.