Chemical Engineering Science, Vol.97, 256-263, 2013
CO2 capture for gas turbines: an integrated energy-efficient process combining combustion in oxygen-enriched air, flue gas recirculation, and membrane separation
Carbon capture and storage for power generation systems is a major issue for achieving greenhouse gas emission reductions. Studies are usually dedicated to coal-fired power plants, but few efforts have addressed the challenge of CO2 capture for a gas turbine. In this paper, a recently reported hybrid process based on oxygen enriched air combustion, flue gas recycling and CO2 capture by membranes is explored for a 250 MW open cycle gas turbine. An improved configuration based on an energy recovery system integrated with a heat exchanger offers superior performance compared to the reference gas turbine cycle. It is shown that an overall energy requirement below 2 GJ(th)/ton of CO2 captured (i.e. around 205 kWh(electrical)/ton CO2) can be achieved using a highly selective membrane (CO2/N-2 selectivity of 200) operated under optimal process conditions. (C) 2013 Elsevier Ltd. All rights reserved.