| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel gas saturator for consistently, stably supplying humidified fuel to a gas turbine. SOLUTION: A combined cycle device contains gas and steam turbines 102, 103; a saturator 201 for supplying humidified and heated fuel gas to the gas turbine; a fuel gas superheater 202; a gas turbine exhaust heat recovery device 105 for generating steam and heating water for the superheater; and a saturator heater for a recycling water pipe 211. The ratio of water to be supplied to the fuel gas saturator to dry fuel gas to be supplied to the fuel gas saturator is kept constant by adjusting the rate of recycling water flow. Additional characteristics of humidified fuel gas, such as temperature, water content, composition, and calorific value, are used for controlling water recycling flow so as to supply constant humidified fuel gas to the gas turbine device.
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