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Energies 2016, 9(12), 1004;

A Novel Boil-Off Gas Re-Liquefaction Using a Spray Recondenser for Liquefied Natural-Gas Bunkering Operations

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daehak-ro 291, Yuseong-gu, Daejeon 34141, Korea
Samsung Heavy Industries, Pangyo-ro 23, Bundang-gu, Seongnam-si, Gyeonggi-do 13486, Korea
Dept. of Naval Architecture and Ocean Engineering, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul 08826, Korea
Author to whom correspondence should be addressed.
Academic Editor: Jacek Majorowicz
Received: 19 September 2016 / Revised: 23 November 2016 / Accepted: 23 November 2016 / Published: 29 November 2016
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This study presents the design of a novel boil-off gas (BOG) re-liquefaction technology using a BOG recondenser system. The BOG recondenser system targets the liquefied natural gas (LNG) bunkering operation, in which the BOG phase transition occurs in a pressure vessel instead of a heat exchanger. The BOG that is generated during LNG bunkering operation is characterized as an intermittent flow with various peak loads. The system was designed to temporarily store the transient BOG inflow, condense it with subcooled LNG and store the condensed liquid. The superiority of the system was verified by comparing it with the most extensively employed conventional re-liquefaction system in terms of consumption energy and via an exergy analysis. Static simulations were conducted for three compositions; the results indicated that the proposed system provided 0 to 6.9% higher efficiencies. The exergy analysis indicates that the useful work of the conventional system is 24.9%, and the useful work of the proposed system is 26.0%. Process dynamic simulations of six cases were also performed to verify the behaviour of the BOG recondenser system. The results show that the pressure of the holdup in the recondenser vessel increased during the BOG inflow mode and decreased during the initialization mode. The maximum pressure of one of the bunkering cases was 3.45 bar. The system encountered a challenge during repetitive operations due to overpressurizing of the BOG recondenser vessel. View Full-Text
Keywords: liquefied natural gas; boil-off gas; bunkering; re-liquefaction; recondenser liquefied natural gas; boil-off gas; bunkering; re-liquefaction; recondenser

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Ryu, J.; Lee, C.; Seo, Y.; Kim, J.; Seo, S.; Chang, D. A Novel Boil-Off Gas Re-Liquefaction Using a Spray Recondenser for Liquefied Natural-Gas Bunkering Operations. Energies 2016, 9, 1004.

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