Phase Behavior of CO2-Rich Mixtures Involving Gas Hydrates and Ices as a Challenge for the Design of CCS/U Technologies

0563935 - ÚT 2023 CZ eng A2 - Proceedings Abstract
Vinš, Václav - Jäger, A. - Fiedler, F. - Hrubý, Jan - Čenský, Miroslav - Span, R.
Phase Behavior of CO2-Rich Mixtures Involving Gas Hydrates and Ices as a Challenge for the Design of CCS/U Technologies.
2022.
[DECARB 2022 – Decarbonisation of Energy Intensive Industries – Conference under the Czech Presidency of the Council of the European Union. 10.11.2022-11.11.2022, Praha]
R&D Projects: GA MŠMT(CZ) EF16_019/0000753
Institutional support: RVO:61388998
Keywords : carbon dioxide * mixture * carbon capture storage and utilization * modeling
OECD category: Thermodynamics
https://www.decarb2022.eu/Amca-DECARB/media/content/abstracts/Vins.pdf

Design of new technologies for carbon capture, transport, storage, and utilization heavily relies on the knowledge of thermophysical properties, thermodynamics, transport, and phase change processes in CO2-rich systems. Unlike other technologically relevant and in general well-described fluids such as aqueous mixtures, natural gas or refrigerants, carbon dioxide and its mixtures exhibit complex phase behavior involving vapor, supercritical fluid, CO2-rich liquid, water-rich liquid, and even solid phases such as dry ice and gas hydrates. As a result, the properties and phase behavior of CO2 systems can dramatically change even with a tiny variation of temperature, pressure or the mixture composition. Inappropriate design together with inaccurate detection of the system performance can result in serious failure of the CCS/U technologies such as pipeline blockage. Since carbon dioxide will not be in a pure state in any of the CCS/U technologies, the accurate description of thermophysical properties and phase behavior of its mixtures with components such as carbon monoxide, water, methane, argon, or hydrogen sulfide are of high demand. The water + carbon dioxide mixture is of special interest as it may form solids similar to water ice called clathrates or gas hydrates. The clathrates consist of water molecules arranged in a form of crystal structure and the gas molecules engaged inside the cavities of the crystal. The presence of gas molecules thermodynamically stabilizes the water crystal. The CO2 hydrates can form under CCS/U relevant conditions at temperatures below 20 °C and pressures above 10 bar. Our team has developed an accurate model of the CO2 hydrates that is being successfully used in the research and development of CCS/U technologies.
Permanent Link: https://hdl.handle.net/11104/0339162