The Oxy-CaL process: A novel CO2 capture system by integrating partial oxy2 combustion with the Calcium-Looping process

Abstract

This paper proposes a novel CO2 capture technology from the integration of partial oxy18 combustion and the Calcium Looping capture process based on the multicycle 19 carbonation/calcination of limestone derived CaO. The concentration of CO2 in the carbonator 20 reactor is increased by means of partial oxy-combustion, which enhances the multicycle CaO 21 conversion according to Thermogravimetric analysis results carried out in our work, thus 22 improving the CO2 capture efficiency. On the other hand, energy consumption for partial oxy23 combustion is substantially reduced as compared to total oxy-combustion. All in all, process 24 simulations indicate that the integration of both processes has potential advantages mainly 25 regarding power plant flexibility whereas the overall energy penalty is not increased. Thus, 26 the resulting energy consumption per kilogram of CO2 avoided is kept below 4 MJ/kg CO2, 27 which remains below the typical values reported for total oxy-combustion and amine based 28 CO2 capture systems whereas CO2 capture efficiency is enhanced in comparison with the 29 Calcium Looping process.