Abstract
This paper analyzes the energy, exergy, emissions, and heat exchanger sizes ofa novel gas-turbine/steam-turbine combined cycle based on the chemical gas turbine system (ChGT). The system consists of a series arrangement of a fuel-rich and fuel-lean combustor with their gas turbines, recuperators, and a steam bottoming cycle. The fuel-rich combustion in the first stage creates a reducing atmosphere in the first turbine, which allows higher temperature operation (here 1773-2073 K) with carbon-fiber-reinforced·carbon (C/C) composites blades, and produces low NOx emissions. The second·stage fuel-lean turbine operates at a lower temperature compatible with more conventional blade materials, and completes the fuel combustion. The results show that, compared with conventional combined cycles, the ChGT has distinct advantages, rising with the first-stage TIT: the efficiency is up to 5% higher, the exergy losses are up to 18% lower, the NOx emissions are up to 40% lower, and the required heat exchanger area
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