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Thermodynamic evaluation of the novel distillation column of the air separation unit with integration of liquefied natural gas (LNG) regasification

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  • Chen, Shiqing
  • Dong, Xuezhi
  • Xu, Jian
  • Zhang, Hualiang
  • Gao, Qing
  • Tan, Chunqing

Abstract

A cryogenic air separation unit (ASU) with the implementation of vapor recompression column (VRC) and LNG cryogenic energy is proposed and investigated. To this end, three types of cryogenic rectification column for air separation are first illustrated, and their thermodynamic characteristics are evaluated by the first and second thermodynamic laws. The results show the purity and recovery ratio of product are determined by the total amount of heat duty and the scheme of heat distribution. Compared with the conventional double rectification column and internally heat-integrated distillation column, the VRC is the most suitable column for the ASU with use of LNG cryogenic energy as its lower demand of shaft work and minimum energy of separation. Based on the above analysis, adopting the cryogenic energy from product to cool the reflux and feed air is beneficial for producing vapor product in the proposed process. The operating pressure of ASU could be reduced by about 24%, and the cryogenic energy of LNG can be used efficiently and sufficiently with respect to the supercritical thermophysical property. By adding the air-aid refrigeration process, the proposed process also has the ability to produce liquid oxygen. Under the same oxygen purity and recovery ratio, the optimal results show the power consumption is about 6.9% and 11.1% lower than that in the previous studies in producing vapor and liquid product respectively, and the minimum energy of separation is improved by use of LNG cryogenic energy.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:171:y:2019:i:c:p:341-359
    DOI: 10.1016/j.energy.2018.12.220
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    Cited by:

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    3. Huang, Z.F. & Soh, K.Y. & Wan, Y.D. & Islam, M.R. & Chua, K.J., 2022. "Assessment of an intermediate working medium and cold energy storage (IWM-CES) system for LNG cold energy utilization under real regasification case," Energy, Elsevier, vol. 253(C).
    4. Park, Jinwoo & Qi, Meng & Kim, Jeongdong & Noh, Wonjun & Lee, Inkyu & Moon, Il, 2020. "Exergoeconomic optimization of liquid air production by use of liquefied natural gas cold energy," Energy, Elsevier, vol. 207(C).
    5. Ruziewicz, Adam & Czajkowski, Cezary & Nowak, Andrzej I. & Rak, Józef & Zieliński, Norbert & Pietrowicz, Sławomir, 2022. "Novel industrial gas filling station with an internal cooling system dedicated for speeding up cylinder charging process - Energy and exergy analysis," Energy, Elsevier, vol. 254(PB).
    6. Muhammad Haris Hamayun & Naveed Ramzan & Murid Hussain & Muhammad Faheem, 2020. "Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis," Energies, MDPI, vol. 13(23), pages 1-20, December.
    7. Atienza-Márquez, Antonio & Bruno, Joan Carles & Akisawa, Atsushi & Coronas, Alberto, 2019. "Performance analysis of a combined cold and power (CCP) system with exergy recovery from LNG-regasification," Energy, Elsevier, vol. 183(C), pages 448-461.

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