Abstract
One means of improving the efficiency of waste-to-energy (WTE) systems is the use of combined cycle WTE (CC-WTE) systems that have a gas turbine and a steam turbine. On the other hand, steam injection to a gas turbine combustor has been used as a means of raising the power output and of improving the thermal efficiency. It is considered possible to realize a high-efficiency WTE system by injecting steam produced by the waste heat boiler of a waste incinerating plant as in a CC-WTE system. We describe the performance analysis of steam-injected gas turbine (SIGT) WTE system in terms of the repowering efficiency defined in this paper. As a result, it is concluded that the repowering efficiencies of SIGT-WTE systems are superior to those of CC-WTE systems in which utilize high-pressure-ratio of gas turbines.
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