Simulation of the Effects of Turbine Exhaust Recirculation on the Composition of Flue Gas for a CO2 Capture Unit

摘要

For an effective CO2 absorption by amines, the ?ue gas should contain at least 10% (mol.) of CO2. Moreover, inorder to avoid technical problems related to the oxidative degradation of amines, the ?ue gas should also contain lessthan 5% (mol.) of O2. This paper presents preliminary calculations and simulation of the effects of Flue gas recirculation(FGR) ratios and excess air (EA) on the temperature and the concentration of CO2 and O2 in the exhaust gas of anatural-gas fred turbine. The results of the methodology utilized (preliminary calculations and simulation) indicate that,for a gas turbine that limits the temperature of the exhaust gas leaving the combustor at 1035°C, an excess air (EA) of200% and a Flue Gas Recirculation (FGR) ratio of 0.65 are needed to ft the requirements of an effective absorptionprocess by amines. For a turbine that allows temperatures as high as 1480°C, the operating parameters (EA=100% andFGR ratio of 0.4) will be selected