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

Author

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  • Fu, Qian
  • Kansha, Yasuki
  • Song, Chunfeng
  • Liu, Yuping
  • Ishizuka, Masanori
  • Tsutsumi, Atsushi

Abstract

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 N2 product gas from the top of the single distillation column is recirculated by exchanging heat with the liquid O2 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 O2 with low purity (95mol%). The influence of compressor efficiency, minimum temperature difference in the main condenser and the O2 product purity on the energy requirement were also investigated.

Suggested Citation

  • Fu, Qian & Kansha, Yasuki & Song, Chunfeng & Liu, Yuping & Ishizuka, Masanori & Tsutsumi, Atsushi, 2016. "A cryogenic air separation process based on self-heat recuperation for oxy-combustion plants," Applied Energy, Elsevier, vol. 162(C), pages 1114-1121.
    • Handle: RePEc:eee:appene:v:162:y:2016:i:c:p:1114-1121
    DOI: 10.1016/j.apenergy.2015.03.039
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    References listed on IDEAS

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    1. van der Ham, L.V. & Kjelstrup, S., 2010. "Exergy analysis of two cryogenic air separation processes," Energy, Elsevier, vol. 35(12), pages 4731-4739.
    2. Fu, Chao & Gundersen, Truls, 2013. "Recuperative vapor recompression heat pumps in cryogenic air separation processes," Energy, Elsevier, vol. 59(C), pages 708-718.
    3. Fu, Chao & Gundersen, Truls, 2012. "Using exergy analysis to reduce power consumption in air separation units for oxy-combustion processes," Energy, Elsevier, vol. 44(1), pages 60-68.
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    10. Chen, Shiqing & Dong, Xuezhi & Xu, Jian & Zhang, Hualiang & Gao, Qing & Tan, Chunqing, 2019. "Thermodynamic evaluation of the novel distillation column of the air separation unit with integration of liquefied natural gas (LNG) regasification," Energy, Elsevier, vol. 171(C), pages 341-359.
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