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Operability study on small-scale BOG (boil-off gas) re-liquefaction processes

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  • Son, Hyunsoo
  • Kim, Jin-Kuk

Abstract

This study aims at analyzing dynamic behavior for the full operation cycle considering various alternatives and constraints related to small-scale and seaborne environment for a BOG re-liquefaction process in LNG-fueled ships, leading to significant enhancement of its operability. The design framework includes steady-state modeling, dynamic modeling and control system, with which system-wide dynamic characteristics are readily investigated and operating guidelines for achieving optimal process operations are obtained. Equipment sizing with the appropriate choice of design parameters is made such that the dynamic model developed in this study simulates non-steady-state characteristics in a realistic manner. 8 different process control schemes are proposed, and their technical gains as well as dynamic characteristics are investigated in details. The control algorithms are assessed through controllability analysis, including open loop test, open loop disturbance test and dynamic response against disturbances. For improving process efficiency, operation procedure for shut-down and start-up is designed with constraints imposed such as rotating speed variation and inert material filling for the effective and practically-adequate control for a refrigeration cycle, with which feasible heat transfer can be readily maintained. The case study presented fully demonstrates the validity and applicability of the control system proposed in this study.

Suggested Citation

  • Son, Hyunsoo & Kim, Jin-Kuk, 2019. "Operability study on small-scale BOG (boil-off gas) re-liquefaction processes," Energy, Elsevier, vol. 185(C), pages 1263-1281.
    • Handle: RePEc:eee:energy:v:185:y:2019:i:c:p:1263-1281
    DOI: 10.1016/j.energy.2019.07.139
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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. Yang, Shanju & Fu, Bao & Hou, Yu & Chen, Shuangtao & Li, Zhiguo & Wang, Shaojin, 2019. "Transient cooling and operational performance of the cryogenic part in reverse Brayton air refrigerator," Energy, Elsevier, vol. 167(C), pages 921-938.
    3. He, Tianbiao & Ju, Yonglin, 2016. "Dynamic simulation of mixed refrigerant process for small-scale LNG plant in skid mount packages," Energy, Elsevier, vol. 97(C), pages 350-358.
    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. 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).
    2. Soon-Kyu Hwang & Byung-Gun Jung, 2021. "A Novel Control Strategy on Stable Operation of Fuel Gas Supply System and Re-Liquefaction System for LNG Carriers," Energies, MDPI, vol. 14(24), pages 1-22, December.
    3. 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).
    4. 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).

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