Analysis and assessment of partial re-liquefaction system for liquefied hydrogen tankers using liquefied natural gas (LNG) and H2 hybrid propulsion |
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| Affiliation: | 1. R&D Division, Korean Register, 36, Myeongji Ocean City 9-ro, Gangseo-gu, Busan 46762, Republic of Korea;2. Division of Marine System Engineering, Korea Maritime and Ocean University, 727, Taejong-ro, Yeongdo-gu, Busan 49112, Republic of Korea;1. Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;2. Beijing National Laboratory for Molecular Science (BNLMS), Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China;3. Beijing National Laboratory for Molecular Science (BNLMS), College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China;1. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daehak-ro 291, Yuseong-gu, Daejeon 34141, Republic of Korea;2. Plant Engineering Center, Institute for Advanced Engineering, 175-28, Goan-ro 51 Beon-gil, Baegam-myeon, Cheoin-gu, Yongin, Gyeonggi-do 449-863, Republic of Korea;1. NTNU, Department of Physics, NO-7491 Trondheim, Norway;2. NTNU, Department of Energy and Process Engineering, NO-7491 Trondheim, Norway;3. SINTEF Energy Research, Sem Sælands vei 11, NO-7034 Trondheim, Norway;1. Energy Engineering Research Group, University Institute of Maritime Studies, ETSNM University of A Coruña, Paseo de Ronda 51, A Coruña 15011, Spain;2. Energy Engineering Research Group, University Institute of Maritime Studies, Department of Energy and Marine Propulsion, ETSNM University of A Coruña, Paseo de Ronda 51, A Coruña 15011, Spain;3. Department of Mechanical Engineering, University of La Rioja, C/Luís de Ulloa, 20, 26004 Logroño, La Rioja, Spain;1. Department of Mechanical Engineering, University College of Nabi Akram, Tabriz, Iran;2. Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran;1. Department of Energy and Marine Propulsion, ETSNM, University of A Coruna, Paseo de Ronda 51, A Coruna 15011, Spain;2. Department of Thermal Machines and Engines, C.A.S.E.M, University of Cadiz, Campus Universitario Río San Pedro, Puerto Real, Cádiz, Spain |
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| Abstract: | Boil-off gas (BOG) is inevitable on board liquefied hydrogen tankers and must be managed effectively, by using it as fuel, re-liquefying it or burning it, to avoid cargo tank pressure issues. This study aims to develop a BOG re-liquefaction system optimized for l60,000 m3 liquefied hydrogen tankers with an LNG and hydrogen hybrid propulsion system. The proposed system comprises hydrogen compression and helium refrigerant sections with 2 J–Brayton cascade cycles. Cold energy recovery from the fuels and feed BOG exiting the cargo tanks was used. The system exhibits a coefficient of performance (COP) of 0.07, a specific energy consumption (SEC) of 3.30 kWh/kgLH2, and exergy efficiency of 74.9%, with the hydrogen BOG entering the re-liquefaction system at a feed temperature of ?220 °C. The theoretical COP and SEC values at ideal conditions were 0.09 and 2.47 kWh/kgLH2, respectively. The effects of varying the hydrogen compression pressure, inlet temperature of the hydrogen expander, feed hydrogen temperature and helium compression pressure were investigated. Additionally, the LNG-to-hydrogen fuel ratio was adjusted to satisfy the Energy Efficiency Design Index (EEDI) Phase 2 and 3 emission requirements. |
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| Keywords: | Hydrogen Boil-off gas Re-liquefaction Liquefied hydrogen tanker Exergy efficiency Specific energy consumption |
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