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Optimal Process Design of Onboard Bog Partial Re-Liquefaction System for 170k LNG Carrier

[+] Author Affiliations
Chulmin Hwang, Youngsub Lim

Seoul National University, Seoul, South Korea

Paper No. OMAE2017-61819, pp. V001T01A022; 5 pages
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5763-2
  • Copyright © 2017 by ASME


LNG carriers contain LNG at the cryogenic temperature of below −162°C and slightly above the atmospheric pressure. Although the LNG cargo tanks are well insulated, still the heat leak from the atmosphere and BOG (Boil-Off Gas) generation is inevitable. The re-liquefaction system was devised to prevent this loss of BOG by liquefaction of BOG to LNG. In recent years, with the appearance of the high pressure NG consuming engine (MEGI), the preference of partial re-liquefaction system in LNG carriers is increasing. However, there are insufficient studies about the optimal design of partial re-liquefaction process using the compression and expansion of BOG as a refrigerant for LNG carriers. This study studied the optimal process design of onboard BOG partial re-liquefaction system for LNG carriers based on cost estimation.

Copyright © 2017 by ASME



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