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Optimization and economic evaluation of carbon dioxide BOG Re-liquefaction process considering storage pressure and nitrogen impurity

Author

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  • Jeong, Ijun
  • Jeon, Yoonju
  • Shin, Hongkyoung
  • Lee, Jaejun
  • Lim, Youngsub

Abstract

The increasing demand for carbon capture and storage (CCS) has heightened the need for liquefied carbon dioxide (LCO2) carriers, which require re-liquefaction systems to manage boil-off gas (BOG) generated during transportation. This study proposed new two-stage separation re-liquefaction processes with mixed refrigerants for CO2 BOG containing nitrogen impurity. The proposed processes were evaluated and compared with conventional processes based on annual CO2 emissions under different storage pressure conditions of 6.5 bar and 15 bar. The results demonstrated that the proposed processes reduced annual CO2 emissions by up to 71.6 % and 35.6 % at the storage pressure of 6.5 bar and 15 bar, respectively. Furthermore, the economic feasibility was assessed by considering annual CO2 emissions and annual transported CO2 amount under both pressure conditions. The results indicated that the cases of storage pressure at 6.5 bar resulted in lower costs due to reduced tank costs and the higher density of LCO2.

Suggested Citation

  • Jeong, Ijun & Jeon, Yoonju & Shin, Hongkyoung & Lee, Jaejun & Lim, Youngsub, 2025. "Optimization and economic evaluation of carbon dioxide BOG Re-liquefaction process considering storage pressure and nitrogen impurity," Energy, Elsevier, vol. 323(C).
    • Handle: RePEc:eee:energy:v:323:y:2025:i:c:s0360544225014793
    DOI: 10.1016/j.energy.2025.135837
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