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http://dx.doi.org/10.5394/KINPR.2020.44.4.283

Design and Assessment of Reliquefaction System According to Boil Off Gas Reliquefaction Rate of Liquefied Hydrogen Carrier  

Cho, Wook-Rae (Korean Register)
Lee, Hyun-Yong (Korean Register)
Ryu, Bo-Rim (Department of Marine System Engineering, Graduate School, Korea Maritime & Ocean University)
Kang, Ho-Keun (Division of Marine System Engineering, Korea Maritime & Ocean University)
Publication Information
Journal of Navigation and Port Research / v.44, no.4, 2020 , pp. 283-290 More about this Journal
Abstract
BOG (Boil Off Gas) generation is unavoidable in the liquefied hydrogen carrier, and proper measures are necessary to prevent pressure problems inside the cargo tank. The BOG can be used as propulsion fuel for ships, and the remaining parts used for propulsion must be effectively managed, such as in the form of reliquefying or burning. This study proposes an BOG reliquefaction system optimized for a 160,000 m3 liquefied hydrogen carrier with a hydrogen propulsion system. The system comprises a hydrogen compression and helium refrigerant section, and increases the efficiency by effectively using the cold energy of the BOG discharged from the cargo tank. In this study, the system was evaluated through the exergy efficiency and SEC (Specific Energy Consumption) analysis according to the rate of the reliquefaction of the BOG while the hydrogen BOG with a supply temperature of -220℃ entered the reliquefaction system. As a result, it showed SEC of 4.11 kWh/kgLH2 and exergy efficiency of 60.1% at the rate of reliquefaction of 20%. And the parametric study of the effects of varying the hydrogen compression pressure, inlet temperature of the hydrogen expander, and the feed hydrogen temperature was conducted.
Keywords
hydrogen; boil off gas; reliquefaction; liquefied hydrogen carrier; exergy efficiency; specific energy consumption;
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