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

Hyun Min Park, Jong Min Lee and Tae Hoon Oh

Energy, 2025, vol. 327, issue C

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.

Keywords: Gas hydrates; Pre-combustion; CO2 capture; CCS; Techno-economic analysis; SHAP (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:327:y:2025:i:c:s0360544225019024

DOI: 10.1016/j.energy.2025.136260

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