高湿分空気高効率ガスタービン(AHAT)の研究開発(<総説特集>LNG複合発電技術の最新動向)  [in Japanese] Research & Development of the Advanced Humid Air Turbine(<Reviews>Current and Future Status on Large LNG Burning Combined Power Plants)  [in Japanese]

The Advanced Humid Air Turbine(AHAT) system is promising as a high efficiency medium-size gas turbine system. The AHAT system improves the thermal efficiency by using high-humidity air, a Water Atomization Cooling(WAC) system and a heat recovery system without needing a high firing temperature and pressure ratio. The following gas turbine elemental technologies concerning humidity air have been developed to realize the AHAT system: compressor, recuperator, turbine blade cooling, and combustor. And a pilot plant that consists of a gas turbine generator(two-stage radial compressor with pressure ratio 8, two-stage axial turbine, single-can combustor), recuperator, humidification tower, water recovery system, and other components was constructed to validate performance of the AHAT system. Pilot plant test results showed good performances such as thermal efficiency 40%(LHV) and NO_x emissions less than 10 ppm.