Partial Recuperative Dual Fluid Gas Turbine System

A new gas turbine cycle was proposed as a method for further improvement of thermal efficiency of a steam injection gas turbine. This cycle has an exhaust heat recovery process which preheats a part of the compressor discharge air and generates steam for injection. In this paper are reported the results of parametric performance analysis of the new cycle gas turbine, and comparisons of thermal efficiency between the new gas turbine cycle and conventional steam injection gas turbine systems. The results of the analysis show that the new cycle gas turbine can realize higher efficiency than the three conventional systems, in the usual pressure ratio range as that applied in actual gas turbines. The effect of the injection steam pressure on thermal efficiency of the new cycle gas turbine is also evaluated.