Thermo-Hydraulic Analysis of Liquid CO2 Cryogenic Hoses for Offshore Carbon Sequestration

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🔬研究者:Provides validated thermal-hydraulic model for liquid CO2 flow in corrugated hoses, useful for further CCUS transport research.

🏢実務担当者:Offers design parameters (insulation thickness, flow rate, friction factor) to ensure safe single-phase CO2 transfer in offshore operations.

<title>Abstract</title> <p>Offshore carbon sequestration through CO2 injection into depleted reservoirs has become an essential component of Carbon Capture, Utilization, and Storage (CCUS). A critical operation in offshore sequestration is the transfer of liquid CO2 from transport carriers to injection platforms via floating cryogenic hoses. Owing to the narrow operational pressure–temperature window of liquid CO2 , unintended vaporization may readily occur during transfer, posing risks to flow stability and system safety. Accurate assessment of the thermophysical state of liquid CO2 within cryogenic hoses is therefore essential. In this study, the applicability of the Gnielinski correlation for predicting the Nusselt number in cryogenic hoses with corrugated inner surfaces is first verified by comparison with high-fidelity convective heat transfer results obtained from Large Eddy Simulation. Subsequently, a coupled thermal–hydraulic model incorporating the Gnielinski correlation is developed to analyze the flow and heat transfer characteristics of liquid CO2 flow in the floating cryogenic hoses under subcritical conditions. The model accounts for key parameters, including flow rate, inlet temperature, insulation thickness, and friction factor, to determine the critical inlet pressure required to maintain single-phase CO2 throughout the hose. Parametric analyses reveal that the critical inlet pressure is strongly influenced by hose length, Darcy friction factor, insulation thickness, and flow rate, while inlet temperature variations exert a more pronounced effect at lower flow rates. These findings provide practical guidance for the design and operational optimization of offshore cryogenic hoses, contributing to the safe and stable transfer of liquid CO2 in offshore carbon sequestration systems.</p>

• Research Square https://doi.org/10.21203/rs.3.rs-9711831/v1first seen 2026-05-23 04:32:15 · last seen 2026-05-27 04:21:47