Abstract
In this research, we have developed new gas turbine cogeneration systems. A key technology is adapting steam injection to a gas turbine that has two-stage combustor. In this system, a high-level steam generated from the exhaust heat recovery boiler is injected into the first stage gas turbine. A condensing heat exchanger is installed to recover the latent heat of steam in combustion exhaust gas. As stated above, the significant improvement of power output and the total thermal efficiency can be expected. To realize this system, it is important to determine that the conditions for stable combustion in the case of the low-oxygen atmosphere and the high-level steam injection are determined. We experimentally investigated the characteristics of combustion, and examined the NOx formation from this system by numerical simulations with detailed chemical kinetics. Furthermore, we designed of 2MW class gas turbine system and compared the primary energy consumption of this system with that of ordinary systems. As the result, we clarified that this gas turbine system of high efficiency and low-NOx emission will be able to be realized and contribute energy saving.
