Performance analysis of a hybrid system combining cryogenic separation carbon capture and liquid air energy storage (CS-LAES)

• Published in: Energy (Oxford) 2024-03, Vol.290, p.129867, Article 129867
• Main Authors: Zhang, Liugan, Ye, Kai, Wang, Yongzhen, Han, Wei, Xie, Meina, Chen, Longxiang
• Format: Article
• Language: English
• Subjects: Carbon capture; Cryogenic separation; Energy consumption; Liquid air energy storage; Performance analysis
• ISSN: 0360-5442
• DOI: 10.1016/j.energy.2023.129867

Cryogenic separation carbon capture is a promising green carbon emission reduction approach, which is rarely applied due to its high cold energy requirement. This work proposes a hybrid system combining cryogenic separation carbon capture and liquid air energy storage (CS-LAES), comprehensively utilizing low-temperature and high-pressure conditions of LAES to reduce the energy consumption of cryogenic CO2 separation. Flue gas with higher carbon dioxide (CO2) concentrations from coal-fired power plants is compressed in the charging process of CS-LAES instead of air. The CO2 is captured, and the CO2-free air is liquefied and stored for later use. The results demonstrate that the carbon capture energy consumption of the CS-LAES system is 1.12 GJ/ton, which is 0.68 GJ/ton lower than that of conventional cryogenic capture technology (1.80 GJ/ton). The CO2 capture rate of 99.97 % is higher than that of most existing cryogenic CO2 capture technologies. Moreover, the standalone total exergy efficiency (S_TEE) for energy storage of the CS-LAES system was 63.40 %, which is 5.22 % higher than the baseline LAES. Meanwhile, the dynamic payback period of the CS-LAES system is 5.82 years, which is more economical than that of baseline LAES (12.89 years) due to avoiding expensive carbon tax. •The proposed system has the function of energy storage and carbon capture.•The carbon dioxide capture rate of the proposed system is 99.97 %.•The energy consumption of carbon dioxide capture is only 1.12 GJ/ton.•The total exergy efficiency of the proposed system increases by 5.22 %.•Economic analysis results indicate that the proposed system has commercial feasibility.