Abstract
Advanced Humid Air Gas Turbine (AHAT) suggested by Hitachi Ltd. is a regenerative cycle gas turbine system using humidified air and can achieve higher thermal efficiency than that of the combined cycle (CC). To verify the system concept and cycle performance of AHAT, 3.6MW verification plant was constructed. As a result of the operation test, it has been confirmed the plan output achieving 3.6MW and the validity of AHAT as a power generating system. And the power generation efficiency of 40.02% LHV was achieved; this shows that there is a possibility of exceeding 43%LHV by introducing some corrections. Moreover, it has been confirmed that NOx emission is less than 10ppm at O_2 16% level, and the performance of each component satisfies its design values. Estimate of the thermal efficiency of a medium-size AHAT by using the experimental results showed that the system can achieve 57%LHV, and the performance in partial load can be superior to that of CC.
