Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Optimization of BOG Reliquefaction Process of Carbon Dioxide Considering Nitrogen Content

  • Ijun Jeong (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Youngsub Lim (Department of Naval Architecture and Ocean Engineering, Seoul National University)
  • Received : 2024.05.17
  • Accepted : 2024.08.29
  • Published : 2024.10.31
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Abstract

As the importance of carbon capture and storage (CCS) technology increases for greenhouse gas reduction, CO2 transportation technology is also becoming crucial. Efficiently handling boil-off gas (BOG) generated during voyages is particularly important. This paper proposes a process incorporating two-stage separation and mixed refrigerants to reliquefy CO2 BOG containing nitrogen efficiently. This process was optimized based on specific power consumption (SPC) criteria and compared with the conventional single-stage separation using an ammonia refrigerant. The two-stage separation allows the removal of non-condensable gases, such as nitrogen, before expansion, and the use of mixed refrigerants enables more efficient heat exchange than ammonia refrigerants, improving the reliquefaction rate. As a result, the proposed process reduced SPC by up to 8.8 % with a nitrogen content of 5 mol% and up to 74.7 % with a nitrogen content of 15 mol%. In addition, the proposed process achieved a reliquefaction rate of over 74.2 % across all nitrogen content ranges of 5-15 mol%.

Keywords

Acknowledgement

This research was supported by Korea Institute of Marine Science & Technology Promotion(KIMST) funded by the Ministry of Oceans and Fisheries(2520000243), and the Korea Research Institute of Ships and Ocean engineering, grant from Endowment Project of "Technology Development of Onboard Carbon Capture and Storage System and Pilot Test" funded by Ministry of Oceans and Fisheries (PES5110). The Research Institute of Marine Systems Engineering and Institute of Engineering Research at Seoul National University provided research facilities.

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