Advanced process design of subcooling re-liquefaction system considering storage pressure for a liquefied CO2 carrier

Jaejun Lee, Heechang Son, Juyoung Oh, Taejong Yu, Hyeonuk Kim and Youngsub Lim

Energy, 2024, vol. 293, issue C

Abstract: Because carbon capture and storage methods are considered greenhouse gas reduction technologies, demand for a large liquefied CO2 (LCO2) carrier to transport captured CO2 to storage sites has arisen. To prevent the emission of boil-off CO2 gas during transport, a CO2 re-liquefaction system would be required. This study suggests a new type of LCO2 subcooling re-liquefaction system for an LCO2 carrier and demonstrates its effectiveness by comparing its performance with that of conventional re-liquefaction systems considering LCO2 storage pressure. The results show that the suggested LCO2 subcooling system has lower specific energy consumption than that of conventional LCO2 re-liquefaction systems, even with a simpler configuration. At 15 bar of storage pressure, the LCO2 subcooling system has a lower specific energy consumption of 176.91 kJ/kgCO2, which is 18.2 and 5.3 % lower than that of the Linde–Hampson cycle and vapor-compression refrigeration cycle using NH3 as a refrigerant, respectively. Additionally, economic benefits can be obtained because the boil-off CO2 compressor is not required in an LCO2 subcooling system. Finally, considering CO2 re-liquefaction performance and the design constraints of the LCO2 carrier, 15 bar LCO2 storage conditions with a subcooling system are considered the most economical LCO2 carrier design.

Keywords: Liquefied carbon dioxide (LCO2); Cargo handling system; Re-liquefaction system; Subcooling system; LCO2 carrier; Exergy analysis (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:293:y:2024:i:c:s036054422400327x

DOI: 10.1016/j.energy.2024.130556

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