Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Design of BOG re-liquefaction system of 20,000 m3 liquid hydrogen carrier

  • Byeongchang Byeon (LNG and Cryogenic Technology Center, Korea Institute of Machinery & Materials) ;
  • Hwalong You (Department of Energy Plant Technology, Korea Institute of Machinery & Materials) ;
  • Dongmin Kim (LNG and Cryogenic Technology Center, Korea Institute of Machinery & Materials) ;
  • Keun Tae Lee (LNG and Cryogenic Technology Center, Korea Institute of Machinery & Materials) ;
  • Mo Se Kim (LNG and Cryogenic Technology Center, Korea Institute of Machinery & Materials) ;
  • Gi Dock Kim (LNG and Cryogenic Technology Center, Korea Institute of Machinery & Materials) ;
  • Jung Hun Kim (LNG and Cryogenic Technology Center, Korea Institute of Machinery & Materials) ;
  • Sang Yoon Lee (LNG and Cryogenic Technology Center, Korea Institute of Machinery & Materials) ;
  • Deuk Yong Koh (LNG and Cryogenic Technology Center, Korea Institute of Machinery & Materials)
  • Received : 2023.07.11
  • Accepted : 2023.09.07
  • Published : 2023.09.30
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Abstract

This paper presents the design of a re-liquefaction system as a BOG (boil-off gas) handling process in liquid hydrogen transport vessels. The total capacity of the re-liquefaction system was assumed to be 3 ton/day, with a BOR (boil-off rate) of 0.2 %/day inside the cargo. The re-liquefaction cycle was devised using the He-Brayton Cycle, incorporating considerations of BOG capacity and operational stability. The primary components of the system, such as compressors, expanders, and heat exchangers, were selected to meet domestically available specifications. Case studies were conducted based on the specifications of the components to determine the optimal design parameters for the re-liquefaction system. This encompassed variables such as helium mass flow rate, the number of compressors, compressor inlet pressure and compression ratio, as well as the quantity and composition of expanders. Additionally, an analysis of exergy destruction and exergy efficiency was carried out for the components within the system. Remarkably, while previous design studies of BOG re-liquefaction systems for liquid hydrogen vessels were confined to theoretical and analytical realms, this research distinguishes itself by accounting for practical implementation through equipment and system design.

Keywords

Acknowledgement

This research is supported by the Ministry of Trade, Industry and Energy (MOTIE) and the Korea Energy Technology Evaluation and Planning (KETEP) (No. 20213030040460, Development of a Localization Model for Core technologies (CCS, BOG treatment, CHS system) of Liquid Hydrogen Carrier).

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