A cryogenic air separation process based on self-heat recuperation for oxy-combustion plants

作者：Fu Qian; Kansha Yasuki; Song Chunfeng; Liu Yuping; Ishizuka Masanori; Tsutsumi Atsushi^*

来源：Applied Energy, 2016, 162: 1114-1121.

DOI：10.1016/j.apenergy.2015.03.039

• Oxy-combustion
• CO2 capture
• Cryogenic air separation
• Self-heat recuperation

An advanced cryogenic air separation process for oxy-combustion is proposed, based on self-heat recuperation technology. In contrast to double columns in the conventional cryogenic air separation process, a single distillation column only is used in the proposed process. By using self-heat recuperation technology, the heat of N-2 product gas from the top of the single distillation column is recirculated by exchanging heat with the liquid O-2 in the bottom and feed streams, largely reducing the energy requirement. The simulation results showed that the energy requirement of the proposed cryogenic air separation process was reduced by 20.2% compared with the conventional process when producing O-2 with low purity (95 mol%). The influence of compressor efficiency, minimum temperature difference in the main condenser and the O-2 product purity on the energy requirement were also investigated.

• 出版日期2016-1-15