Analysis of cryogenic CO2 capture technology integrated with Water-Ammonia Absorption refrigeration cycle for CO2 capture and separation in cement plants

Utilizing post-combustion CO2 capture technologies is among the most effective pathways to achieve carbon neutrality by 2050, especially in industries like cement production, where renewables alone cannot sufficiently reduce CO2 emissions. In such scenarios, cryogenic CO2 capture (CCC) emerges as an effective solution for capturing CO2 from both large and small unavoidable point sources. Renowned for its high energy efficiency, minimal investment and operational costs, as well as low energy penalties compared to conventional postcombustion CO2 capture methods, the CCC process can significantly contribute to achieving CO2 neutrality by 2050. This study investigates the application of the CCC process integrated with water-ammonia Absorption Refrigeration Cycle (ARC) for capturing CO2 from the flue gas emitted by a cement factory. This study demonstrated that the CCC process can effectively separate CO2 from the gas mixture in both liquid and gas phases while the form of the separated CO2 minimally affecting the energy penalty of the process. Furthermore, the results indicate that incorporating the ARC significantly enhances the performance of the CCC process, reducing its energy penalty by up to 6% without necessitating significant increases in equipment costs.