Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Thermodynamic Modeling and Analysis of Boil-off Gas Generation and Self-Pressurization in Liquefied Carbon Dioxide Tanks

  • Taehun Nam (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Taejong Yu (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Youngsub Lim (Department of Naval Architecture and Ocean Engineering, Seoul National University)
  • Received : 2024.04.03
  • Accepted : 2024.09.10
  • Published : 2024.10.31
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Abstract

The importance of the safe transport of liquefied carbon dioxide (LCO2) is increasing owing to environmental issues. When transporting a low-temperature liquid, boil-off gas generation and self-pressurization occur due to heat ingress, affecting the holding time of a low-temperature liquid tank. This study developed and compared three thermodynamic self-pressurization models to estimate the holding time of LCO2: Thermal homogeneous model (THM), Thermal two-zone model (TTZM), and Thermal multi-zone model (TMZM). Thermodynamic differential equations were solved for THM, and software was used for TTZM. For TMZM, the parameters were optimized using experimental data to determine the heat ratio parameter f and heat transfer parameters K1 and K2. THM and TTZM estimated an unreasonably long holding time, approximately 42 days. The TMZM, however, showed a satisfactory holding time of 12-13 days. These results can help predict the self-pressurization in the storage tanks of LCO2 and be applied to actual LCO2 carrier cargo handling systems, with the modeling results indicating that the 12-13 days of LCO2 self-pressurization based on the TMZM appears to be the most suitable.

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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