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LNG boil-off gas reliquefaction by Brayton refrigeration system – Part 2: Improvements over basic configuration

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  • Kochunni, Sarun Kumar
  • Joy, Jubil
  • Chowdhury, Kanchan

Abstract

Exergy analysis of reliquefaction system based on Reverse Brayton cycle (RBC), which is used to condense boil-off gas (BOG) generated in LNG carrier ships, was presented with its basic configuration in Part 1. In this paper, three modifications of the basic system are evaluated. One modification is based on intercooling and precooling of BOG before compressor suction. Others involve ambient compression of BOG. Effects of pressure ratio of RBC, mass flow rate of nitrogen, thermal sizes of heat exchangers and entry temperature of BOG to reliquefaction system on each configuration have been evaluated. Sensitivity analysis shows that 7.8% improvement of rational exergy efficiency is obtained for systems with ambient compression. When BOG enters as superheated gas, modified configurations could keep up their performance while basic system deteriorated. Higher adiabatic efficiencies of compressors and turbines improve the performance of the reliquefaction systems across the board without any additional weight or space. Design and operating parameters have been optimized with the aid of in-built optimiser tool of Aspen HYSYS® V8.6. It resulted in an improvement of rational exergy efficiency of configurations by 1%–3% and decrease of total UA by 5–7% compared to best values predicted by sensitivity analysis.

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  • Kochunni, Sarun Kumar & Joy, Jubil & Chowdhury, Kanchan, 2019. "LNG boil-off gas reliquefaction by Brayton refrigeration system – Part 2: Improvements over basic configuration," Energy, Elsevier, vol. 176(C), pages 861-873.
    • Handle: RePEc:eee:energy:v:176:y:2019:i:c:p:861-873
    DOI: 10.1016/j.energy.2019.04.033
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    References listed on IDEAS

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    1. Kwak, Dong-Hun & Heo, Jeong-Ho & Park, Seung-Ha & Seo, Seok-Jang & Kim, Jin-Kuk, 2018. "Energy-efficient design and optimization of boil-off gas (BOG) re-liquefaction process for liquefied natural gas (LNG)-fuelled ship," Energy, Elsevier, vol. 148(C), pages 915-929.
    2. Thomas, Rijo Jacob & Ghosh, Parthasarathi & Chowdhury, Kanchan, 2012. "Application of exergy analysis in designing helium liquefiers," Energy, Elsevier, vol. 37(1), pages 207-219.
    3. Kochunni, Sarun Kumar & Chowdhury, Kanchan, 2019. "LNG boil-off gas reliquefaction by Brayton refrigeration system – Part 1: Exergy analysis and design of the basic configuration," Energy, Elsevier, vol. 176(C), pages 753-764.
    4. Shin, Younggy & Lee, Yoon Pyo, 2009. "Design of a boil-off natural gas reliquefaction control system for LNG carriers," Applied Energy, Elsevier, vol. 86(1), pages 37-44, January.
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    Cited by:

    1. Keuntae Lee & Deuk-Yong Koh & Junseok Ko & Hankil Yeom & Chang-Hyo Son & Jung-In Yoon, 2020. "Design and Performance Test of 2 kW Class Reverse Brayton Cryogenic System," Energies, MDPI, vol. 13(19), pages 1-13, September.
    2. Jin, Chunhe & Lim, Youngsub & Xu, Xin, 2023. "Performance analysis of a boil-off gas re-liquefaction process for LNG carriers," Energy, Elsevier, vol. 278(C).
    3. Tomasz Banaszkiewicz & Maciej Chorowski & Wojciech Gizicki & Artur Jedrusyna & Jakub Kielar & Ziemowit Malecha & Agnieszka Piotrowska & Jaroslaw Polinski & Zbigniew Rogala & Korneliusz Sierpowski & Ja, 2020. "Liquefied Natural Gas in Mobile Applications—Opportunities and Challenges," Energies, MDPI, vol. 13(21), pages 1-35, October.
    4. Yin, Liang & Ju, Yonglin, 2020. "Design and analysis of a process for directly Re-liquefying BOG using subcooled LNG for LNG carrier," Energy, Elsevier, vol. 199(C).
    5. Yin, Liang & Ju, Yonglin, 2020. "Conceptual design and analysis of a novel process for BOG re-liquefaction combined with absorption refrigeration cycle," Energy, Elsevier, vol. 205(C).
    6. Cao, Xuewen & Yang, Jian & Zhang, Yue & Gao, Song & Bian, Jiang, 2022. "Process optimization, exergy and economic analysis of boil-off gas re-liquefaction processes for LNG carriers," Energy, Elsevier, vol. 242(C).
    7. Kochunni, Sarun Kumar & Chowdhury, Kanchan, 2020. "Use of dual pressure Claude liquefaction cycles for complete and energy-efficient reliquefaction of boil-off gas in LNG carrier ships," Energy, Elsevier, vol. 198(C).
    8. Son, Hyunsoo & Kim, Jin-Kuk, 2020. "Energy-efficient process design and optimization of dual-expansion systems for BOG (Boil-off gas) Re-liquefaction process in LNG-fueled ship," Energy, Elsevier, vol. 203(C).
    9. Yin, Liang & Ju, Yonglin, 2022. "Review on the design and optimization of BOG re-liquefaction process in LNG ship," Energy, Elsevier, vol. 244(PB).
    10. Bian, Jiang & Yang, Jian & Liu, Yang & Li, Yuxing & Cao, Xuewen, 2022. "Analysis and efficiency enhancement for energy-saving re-liquefaction processes of boil-off gas without external refrigeration cycle on LNG carriers," Energy, Elsevier, vol. 239(PB).

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