NOx emission characteristics of fuel-rich pressurized combustion of methane-air

摘要

A new concept of a gas turbine/steam turbine combined cycle system referred to as the "Chemical Gas Turbine" system was proposed in order to raise the total thermal efficiency of existing systems by approximately 15percent. The chemical gas turbine consists of a combustor operated under fuel-rich conditions and of C/C composites material adopted for fabrication of the turbine blade. From the calculation of the total thermal efficiency of the combined system at a temperature of 1500 deg C, it was clear that the maximum values of thermal efficiency based on a low-calorific value for a simple cycle of the chemical gas turbine and a combined cycle system are about 44 and 66 percent, respectively under the equivalence ratio of 2.0. The efficiency of the combined cycle system is much higher than that of existing conventional ones.