Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Optimal Process Design of Onboard BOG Re-liquefaction System for LNG Carrier

LNG 운반선을 위한 BOG 재액화시스템 최적 설계

  • Hwang, Chulmin (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Lim, Youngsub (Research Institute of Marine Systems Engineering, Seoul National University)
  • 황철민 (서울대학교 조선해양공학과) ;
  • 임영섭 (서울대학교 해양시스템공학연구소)
  • Received : 2018.03.16
  • Accepted : 2018.10.18
  • Published : 2018.10.31
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Abstract

High-pressure gas injection engines (HPGI) took center stage in LNG carrier propulsion systems after their advent. The HPGI engine system can be easily modified to include a re-liquefaction system by adding several devices, which can significantly increase the economic feasibility of the total system. This paper suggests the optimal operating conditions and capacity for a re-liquefaction system for an LNG carrier, which can minimize increases in the total annualized cost. The installation of a re-liquefaction system can save 0.23 million USD per year when the cost of LNG is 5 USD/Mscf. A sensitivity analysis with different LNG costs showed that the re-liquefaction system is profitable when the LNG cost is higher than 3.5 USD/Mscf.

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References

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