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Design of the compressor-assisted LNG fuel gas supply system

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  • Park, Hyunjun
  • Lee, Sanghuk
  • Jeong, Jinyeong
  • Chang, Daejun

Abstract

This paper proposes an LNG fuel gas supply system in which the compressors are used for multiple purposes. Referred to as the compressor-assisted fuel gas supply system (CA-FGSS), the proposed system uses its compressors to both manage the boil-off gas (BOG) in the LNG fuel tank and generate a pressure differential for drawing LNG from the tank. The feasibility of the defined operation sequence of the CA-FGSS was verified by dynamic process simulations in which the system was applied to two-stroke dual-fuel engines that required medium and high fuel gas injection pressures (16 and 300 bar), respectively. An availability analysis revealed 99% system availability of the CA-FGSS, which has a lower number of redundant equipment compared to a conventional pump-based fuel gas supply system (PB-FGSS). This is because the CA-FGSS does not use components with high failure rates and long maintenance times, such as in-tank pumps in the LNG fuel tank. These findings demonstrate the economic feasibility of the CA-FGSS, which also has a 10% lower capital expenditure compared to a PB-FGSS. A sensitivity analysis of the entire propulsion system of the CA-FGSS further showed that it was operationally more economical than a PB-FGSS for the same gas supply pressure. Moreover, a high-pressure propulsion system that utilizes the CA-FGSS was found to be more economical than a medium-pressure propulsion system for a high LNG price.

Suggested Citation

  • Park, Hyunjun & Lee, Sanghuk & Jeong, Jinyeong & Chang, Daejun, 2018. "Design of the compressor-assisted LNG fuel gas supply system," Energy, Elsevier, vol. 158(C), pages 1017-1027.
    • Handle: RePEc:eee:energy:v:158:y:2018:i:c:p:1017-1027
    DOI: 10.1016/j.energy.2018.06.055
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    References listed on IDEAS

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    1. Fernández, Ignacio Arias & Gómez, Manuel Romero & Gómez, Javier Romero & Insua, Álvaro Baaliña, 2017. "Review of propulsion systems on LNG carriers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 67(C), pages 1395-1411.
    2. Thomson, Heather & Corbett, James J. & Winebrake, James J., 2015. "Natural gas as a marine fuel," Energy Policy, Elsevier, vol. 87(C), pages 153-167.
    3. Kim, Juwon & Seo, Youngkyun & Chang, Daejun, 2016. "Economic evaluation of a new small-scale LNG supply chain using liquid nitrogen for natural-gas liquefaction," Applied Energy, Elsevier, vol. 182(C), pages 154-163.
    4. Seo, Suwon & Han, Sangheon & Lee, Sangick & Chang, Daejun, 2016. "A pump-free boosting system and its application to liquefied natural gas supply for large ships," Energy, Elsevier, vol. 105(C), pages 70-79.
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    Cited by:

    1. 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.
    2. 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).

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