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Techno-economic assessment and feature importance analysis of gas hydrate-based carbon capture processes

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  • Park, Hyun Min
  • Lee, Jong Min
  • Oh, Tae Hoon

Abstract

Among emerging CO2 capture approaches, hydrate-based carbon capture (HBCC) has shown particular promise for pre-combustion applications, given its eco-friendly, water-based solvent. This study conducted a comprehensive techno-economic assessment of various HBCC configurations and introduced a novel process design that transports CO2 as a hydrate. Compared to a state-of-the-art absorption process, the proposed HBCC design reduced the levelized cost of CO2 captured (LCOC) by 6.8%. Sensitivity analyses covering plant capacity confirmed that this configuration was especially cost-effective at lower feed flowrates. Further feature-importance analysis using SHapley Additive exPlanations (SHAP) revealed that removing the dissociation stage and decreasing the water-to-gas ratio were critical for minimizing LCOC. These results indicate that an optimized HBCC outperforms conventional methods in cost and efficiency while offering a straightforward path to improved economic and environmental viability.

Suggested Citation

  • Park, Hyun Min & Lee, Jong Min & Oh, Tae Hoon, 2025. "Techno-economic assessment and feature importance analysis of gas hydrate-based carbon capture processes," Energy, Elsevier, vol. 327(C).
    • Handle: RePEc:eee:energy:v:327:y:2025:i:c:s0360544225019024
    DOI: 10.1016/j.energy.2025.136260
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