Simulation Model of Regenerative LNG Refrigeration System for Re-Liquification of BOG

Sung-Hun Son and Kibum Kim
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Sung-Hun Son: Department of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Korea
Kibum Kim: Department of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Korea

Energies, 2020, vol. 13, issue 15, 1-14

Abstract: Boil-off gas (BOG) disposal in liquefied natural gas (LNG) tankers has long been considered inevitable owing to the constant vaporization of the LNG in the storage tanks, but results in energy waste and environmental pollution. To address these challenges, we developed a re-liquification system that can condense the BOG and return it to the storage tank. The re-liquification system was modeled, and a case study was conducted to evaluate the viability of the system. The energy waste, which was quantified by tonnes of oil equivalent (TOE), greenhouse-gas emissions in tonnes of carbon dioxide (TCO 2 ), and cost reduction in millions of U.S. dollars (MUSD), was evaluated for five different tanker cruising speeds. The re-liquification system significantly reduced the average TOE, TCO 2 , and cost by up to 9120.40 TOE/year, 19,474.33 TCO 2 /year, and 1.9765 MUSD/year, respectively, for five different tanker speeds with multi-stage compression.

Keywords: BOG (boil-off gas); re–liquification cycle; regeneration; LNG (liquefied natural gas); AMESim (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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