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The Advanced Humid Air Turbine system improves the gas turbine thermal efficiency by using high-humidity air 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. A system verification 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 will be completed in a few months. The validation and performance test begin in October 2006. The expected performance is: rated output 3.6MW, efficiency 43% (LHV), and NO_x emissions less than 10ppm at 16% O2 from 50% to 100% load.
