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Determining the minimum energy requirement of an LNG process: New insights into the impact of the vapour liquid equilibrium

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  • Xuan, Ivan Ying
  • Pretlove, John
  • Haugen, Trond
  • Thornhill, Nina F.

Abstract

The paper provides a detailed first principles analysis of a process of liquefaction of natural gas in which the refrigeration compressors are driven by electric motors. The aim is to determine and understand the impact of the operation of the refrigeration cycles on the power consumption of the process. This study gives insights into the relationship between the discharge pressure of the compressors and the thermodynamic performance of the refrigeration cycles. By doing this, the findings of this research highlight the importance of the vapour liquid equilibrium. The results show that, for a given production rate, there is a minimum in the power consumption when the discharge pressures are close to the refrigerant saturation points. The paper provides a discussion and analysis of the advantages and disadvantages of operating at such points.

Suggested Citation

  • Xuan, Ivan Ying & Pretlove, John & Haugen, Trond & Thornhill, Nina F., 2020. "Determining the minimum energy requirement of an LNG process: New insights into the impact of the vapour liquid equilibrium," Energy, Elsevier, vol. 203(C).
    • Handle: RePEc:eee:energy:v:203:y:2020:i:c:s0360544220308926
    DOI: 10.1016/j.energy.2020.117785
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    References listed on IDEAS

    as
    1. Remeljej, C.W. & Hoadley, A.F.A., 2006. "An exergy analysis of small-scale liquefied natural gas (LNG) liquefaction processes," Energy, Elsevier, vol. 31(12), pages 2005-2019.
    2. Mokarizadeh Haghighi Shirazi, M. & Mowla, D., 2010. "Energy optimization for liquefaction process of natural gas in peak shaving plant," Energy, Elsevier, vol. 35(7), pages 2878-2885.
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    Cited by:

    1. Xuan, Ivan Ying & Skourup, Charlotte & Jensen, Jørgen B. & Haugen, Trond & Thornhill, Nina F., 2022. "Flexible operation of a mixed fluid cascade LNG plant for electrical power management," Energy, Elsevier, vol. 250(C).

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