Coupling Mass Transfer with Mineral Reactions to Investigate CO<sub>2</sub> Sequestration in Saline Aquifers With Non-Equilibrium thermodynamics

Yuanhui Ji
Division of Energy Engineering, Luleå University of Technology, Sweden

Xiaoyan Ji
Division of Energy Engineering, Luleå University of Technology, Sweden

Xiaohua Lu
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, China

Yongmin Tu
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, China \ Division of Structural Design and Bridges, Royal Institute of Technology (KTH), Sweden

Ladda ner artikelhttp://dx.doi.org/10.3384/ecp11057689

Ingår i: World Renewable Energy Congress - Sweden; 8-13 May; 2011; Linköping; Sweden

Linköping Electronic Conference Proceedings 57:16, s. 689-696

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Publicerad: 2011-11-03

ISBN: 978-91-7393-070-3

ISSN: 1650-3686 (tryckt), 1650-3740 (online)


The coupling behaviors of mass transfer of aqueous CO2 with mineral reactions of aqueous CO2 with rock anorthite are investigated by chemical potential gradient and concentration gradient models; respectively. SAFT1-RPM is used to calculate the fugacity of CO2 in brine. The effective diffusion coefficients of CO2 are obtained based on the experimental kinetic data reported in literature. The calculation results by the two models and for two cases (mass transfer only and coupling mass transfer with mineral reaction) are compared. The results show that there are considerable discrepancies for the concentration distribution with distance by the concentration gradient and chemical potential gradient models; which implies the importance of consideration of the non-ideality. And the concentrations of aqueous CO2 at different distances by the concentration gradient model are higher and further than that by the chemical potential gradient model. The mineral reaction plays a considerable role for the CO2 geological sequestration when the time scale reaches 10 years for the anorthite case.


CO<sub>2</sub> geological sequestration; Non-equilibrium thermodynamics; Chemical potential gradient; Mass transfer; Geochemical reaction


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