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Open AccessArticle

Case Study on Boil-Off Gas (BOG) Minimization for LNG Bunkering Vessel Using Energy Storage System (ESS)

1
Future Technology Research Team, Korean Register (KR), Busan 46762, Korea
2
Division of Marine System Engineering, Korea Maritime and Ocean University, Busan 49112, Korea
*
Authors to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(5), 130; https://doi.org/10.3390/jmse7050130
Received: 1 April 2019 / Revised: 22 April 2019 / Accepted: 30 April 2019 / Published: 6 May 2019
(This article belongs to the Special Issue Marine Propulsion)
Liquefied natural gas (LNG) is recognized as a preferable alternative fuel for ship owners, since it can substantially reduce harmful emissions to comply with stricter environmental regulations. The increasing number of LNG-fueled vessels has driven up the number of LNG bunkering vessels (LNGBVs) as well. A key issue of LNGBVs is boil-off gas (BOG) generation, especially the huge amount of BOG that is generated during loading and unloading (bunkering) processes. This study proposes a hybrid system that combines conventional onboard LNG-fueled generators with an energy storage system (ESS) to solve the BOG issue of LNGBVs. This hybrid system is targeted at an LNGBV with the cargo capacity of 5000 m3. The amount of BOG generation is calculated based on assumed operation modes, and the economic study and the environmental analysis are performed based on the results. By comparing the conventional system to the proposed ones, some benefits can be verified: about 46.2% BOG reduction, 66.0% fuel saving, a 7.6-year payback period, and 4.8 tons of greenhouse gas (GHG) reduction for one voyage in the best case, with some assumptions. This proposed hybrid system using the ESS could be an attractive green solution to LNGBV owners. View Full-Text
Keywords: LNG bunkering vessel (LNGBV); LNG-fueled vessel; boil-off gas (BOG); energy storage system (ESS); battery; greenhouse gas (GHG); hybrid system LNG bunkering vessel (LNGBV); LNG-fueled vessel; boil-off gas (BOG); energy storage system (ESS); battery; greenhouse gas (GHG); hybrid system
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Kim, K.; Park, K.; Roh, G.; Chun, K. Case Study on Boil-Off Gas (BOG) Minimization for LNG Bunkering Vessel Using Energy Storage System (ESS). J. Mar. Sci. Eng. 2019, 7, 130.

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