Abstract
The Advanced Humid Air Turbine (AHAT) 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 was constructed to validate performance of AHAT system. The verification test has been begun since October 2006. The test results showed good performance such as thermal efficiency over 40%(LHV) and NO_x emissions less than 10ppm.
