Patent ID: 7587887

Claim:
An advanced humid air turbine power plant comprising a compressor for compressing air, a humidifying tower for humidifying compressed air introduced from said compressor, a combustor for burning fuel and humidified air supplied from said humidifying tower, a gas turbine driven by combustion gases generated in said combustor, a recuperator for performing heat exchange between exhaust gases discharged from said combustor and the humidified air supplied to said combustor, a compressed air supply line for supplying, as cooling air, the compressed air generated by said compressor to a high-temperature component of said gas turbine, and a humidified air supply line for supplying the humidified air added with moisture in said humidifying tower to the high-temperature component of said gas turbine, wherein said power plant further comprises a compressed air supply valve for adjusting a flow rate of the compressed air supplied, as cooling air, to the high-temperature component of the gas turbine via said compressed air supply line, and a humidified air supply valve for adjusting a flow rate of the humidified air supplied, as cooling air, to the high-temperature component of the gas turbine via said humidified air supply line, the humidified air being the sole delivered coolant during normal operation under load; wherein in the event of an abnormality in said humidified air supply line, a supply source of the gas turbine cooling air is switched over from said humidified air supply line to said compressed air supply line and a load of the gas turbine is decreased.