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Application of partially diabatic divided wall column to floating liquefied natural gas plant

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  • Kim, Young Han

Abstract

The offshore operation of chemical plant requires the compactness of process equipments due to its harsh environment. A DWC (divided wall column), a compact ternary separator, is a good candidate for distillation process in the offshore operation. In this study the DWC is applied to the offshore FLNG (floating liquefied natural gas) plant, but high utility cost is required in the application because of the large difference of boiling points among feed components. A partially diabatic DWC is proposed for the reduction of the operating cost here, and its design procedure is presented along with performance and economic evaluations and the examination of thermodynamic efficiency as well. The heating duty of the proposed DWC including tray heat transfer is 35% less than that of the conventional system, and the cooling duty is 18% less. The evaluation indicates that some 16% less utility cost is used in the DWC compared with the conventional system, though 7% more investment is required. The exergy loss is reduced by 12%, and the thermodynamic efficiency is improved by 3.3 percentage point over the conventional system.

Suggested Citation

  • Kim, Young Han, 2014. "Application of partially diabatic divided wall column to floating liquefied natural gas plant," Energy, Elsevier, vol. 70(C), pages 435-443.
    • Handle: RePEc:eee:energy:v:70:y:2014:i:c:p:435-443
    DOI: 10.1016/j.energy.2014.04.020
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    References listed on IDEAS

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    Cited by:

    1. Xiong, Xiaojun & Lin, Wensheng & Gu, Anzhong, 2015. "Integration of CO2 cryogenic removal with a natural gas pressurized liquefaction process using gas expansion refrigeration," Energy, Elsevier, vol. 93(P1), pages 1-9.
    2. Alcántara-Avila, J.Rafael & Sotowa, Ken-Ichiro & Horikawa, Toshihide, 2015. "Entropy production and economic analysis in diabatic distillation columns with heat exchangers in series," Energy, Elsevier, vol. 93(P2), pages 1719-1730.
    3. Kim, Young Han, 2015. "Energy saving of side-column DWCs for quaternary separation," Energy, Elsevier, vol. 86(C), pages 617-626.
    4. Sun, Chongzheng & Li, Yuxing & Han, Hui & Zhu, Jianlu & Wang, Shaowei & Liu, Liang, 2019. "Experimental and numerical simulation study on the offshore adaptability of spiral wound heat exchanger in LNG-FPSO DMR natural gas liquefaction process," Energy, Elsevier, vol. 189(C).
    5. Qyyum, Muhammad Abdul & Qadeer, Kinza & Minh, Le Quang & Haider, Junaid & Lee, Moonyong, 2019. "Nitrogen self-recuperation expansion-based process for offshore coproduction of liquefied natural gas, liquefied petroleum gas, and pentane plus," Applied Energy, Elsevier, vol. 235(C), pages 247-257.
    6. Kim, Young Han, 2016. "Energy saving of benzene separation process for environmentally friendly gasoline using an extended DWC (divided wall column)," Energy, Elsevier, vol. 100(C), pages 58-65.

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