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Energy-efficient process design and optimization of dual-expansion systems for BOG (Boil-off gas) Re-liquefaction process in LNG-fueled ship

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  • Son, Hyunsoo
  • Kim, Jin-Kuk

Abstract

Energy efficiency of the conventional boil-off gas re-liquefaction process in the LNG-fueled ships, which is based on a single expander cycle, can be improved with structural modifications, such as a dual expander cycle. Herein, a structural optimization framework concept is proposed to systematically screen a wide range of configurational options for dual expander processes, and to evaluate their techno-economic impacts in a holistic manner. Ten possible process configurations are embedded in the framework, with which the strategic use of design options, including splitting and/or mixing of streams, and introduction of extra hot stream in the exchanger, are fully investigated. Furthermore, a cascaded cycle is compared as a possible candidate for improving the energy efficiency of the single expander process. The optimum process design is investigated by optimizing process variables to achieve maximum energy efficiency with aid of GA (Genetic Algorithm). The optimized performance of the dual-expander process is 23% better than the single expander system in terms of energy efficiency. The advantage of the proposed modeling and optimization framework is its adaptability to other liquefaction processes.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:203:y:2020:i:c:s0360544220309300
    DOI: 10.1016/j.energy.2020.117823
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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. Yin, L. & Ju, Y.L., 2019. "Comparison and analysis of two nitrogen expansion cycles for BOG Re-liquefaction systems for small LNG ships," Energy, Elsevier, vol. 172(C), pages 769-776.
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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. Xu, Jingxuan & Lin, Wensheng, 2021. "Integrated hydrogen liquefaction processes with LNG production by two-stage helium reverse Brayton cycles taking industrial by-products as feedstock gas," Energy, Elsevier, vol. 227(C).
    4. Jessie R. Smith & Savvas Gkantonas & Epaminondas Mastorakos, 2022. "Modelling of Boil-Off and Sloshing Relevant to Future Liquid Hydrogen Carriers," Energies, MDPI, vol. 15(6), pages 1-32, March.
    5. Wang, Cheng & Ju, Yonglin & Fu, Yunzhun, 2021. "Comparative life cycle cost analysis of low pressure fuel gas supply systems for LNG fueled ships," Energy, Elsevier, vol. 218(C).
    6. Yu, Taejong & Kim, Donghoi & Gundersen, Truls & Lim, Youngsub, 2023. "A feasibility study of HFO refrigerants for onboard BOG liquefaction processes," Energy, Elsevier, vol. 282(C).
    7. 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).
    8. Lei Gao & Jiaxin Wang & Maxime Binama & Qian Li & Weihua Cai, 2022. "The Design and Optimization of Natural Gas Liquefaction Processes: A Review," Energies, MDPI, vol. 15(21), pages 1-56, October.
    9. Lee, Jaejun & Son, Heechang & Yu, Taejong & Oh, Juyoung & Park, Min Gyun & Lim, Youngsub, 2023. "Process design of advanced LNG subcooling system combined with a mixed refrigerant cycle," Energy, Elsevier, vol. 278(PA).
    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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