A feasible energy-saving analysis of a new system for CO2 cryogenic capture

作者：Li, Shuhong^*; Ding, Jie; Zhang, Xiaosong; Cheng, Deyuan; Hu, Xinyu; Li, Xianliang

来源：International Journal of Low Carbon Technologies, 2016, 11(2): 235-239.

DOI：10.1093/ijlct/ctt065

• carbon dioxide
• cryogenic capture
• improvements
• N-2/O-2 separation
• energy consumption

A new CO2 cryogenic capture and liquefaction system has been proposed previously in order to separate CO2 from exhausted gases and make it as a resource for industry. This system combines CO2 cryogenic capture with N-2/O-2 separation together. Its energy consumption is lower than the traditional amine solution capture process as theoretical analysis. In this study, the simulation of the proposed system with several improvements was carried out aiming to reduce the energy consumption further. Many heat exchangers were introduced and the heat exchanger arrangements were optimized to recycle the refrigeration capacity from the returned N-2 after the N-2/O-2 separation. The discharge pressure of mixture gas from the compressor was reduced from 10 to 3.493 MPa. The simulation results showed that the compression work could be greatly reduced and the energy consumption of CO2 capture in this new system after these improvements reached 2.884 GJ/ton CO2. The new system is promising because not only liquid or solid CO2 could be produced but also N-2 and O-2 could be separated.

• 出版日期2016-6
• 单位东南大学