Abstract
CO2 hydrate formation and dissociation is crucial for hydrate-based CO2 capture and storage. Experimental and calculated phase equilibrium conditions of carbon dioxide (CO2) hydrate in porous medium were investigated in this study. Glass beads were used to form the porous medium. The experimental data were generated using a graphical method. The results indicated the decrease of pore size resulted in the increase of the equilibrium pressure of CO2 hydrate. Magnetic resonance imaging (MRI) was used to investigate the priority formation site of CO2 hydrate in different porous media, and the results showed that the hydrate form firstly in BZ-02 glass beads under the same pressure and temperature. An improved model was used to predict CO2 hydrate equilibrium conditions, and the predictions showed good agreement with experimental measurements.
Highlights
The greenhouse effect is leading to a significant climate warming and weather changes [1]
The pressure and temperature (p-T) curve during CO2 hydrate formation and dissociation was dependent on the kinds of porous medium
The improved model of Song et al [30] was used for predicting the equilibrium conditions for CO2 hydrates in porous medium, which was based on the traditional model of van der Waals and Plateeuw [31]
Summary
The greenhouse effect is leading to a significant climate warming and weather changes [1]. Presented experimental methane, carbon dioxide, and methane-carbon dioxide hydrate equilibrium and ice-melting data for meso-pores silica glass, and determined similar values of interfacial tensions for ice-water, methane clathrate-water, and carbon dioxide clathrate-water. Following their studies, Kumar [22] collected experimental equilibrium conditions data for CO2 hydrate in porous medium and measured the permeability of the porous medium in the presence of hydrate by flowing through the system. In this work, considering the limited data available in macro porous medium, we carried out experiments in glass beads which enable the study of the impact of porosity-related properties like capillary effects on the equilibrium conditions. MRI was used in this study to determine the priority formation position of CO2 hydrate in different pore sizes
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