A preliminary investigation of cryogenic CO2 capture utilizing a reverse Brayton Cycle

Utilizing CO₂ capture and storage (CCS) technologies is a significant way to reduce carbon emissions from coal fired power plants. Cryogenic CO₂ capture (CCC) is an innovative and promising CO₂ capture technology, which has an apparent energy and environmental advantage compared to alternatives. A process of capturing CO₂ from the flue gas of a coal-fired electrical power plant by cryogenically desublimating CO₂ has been discussed and demonstrated theoretically. However, pressurizing the inlet flue gas to reduce the energy penalty for the cryogenic process will lead to a more complex system. In this paper, a modified CCC system utilizing a reverse Brayton Cycle is proposed, and the energy penalty of these two systems are compared theoretically.