Ex Situ Dissolution of CO2: A New Engineering Methodology Based on Mass-Transfer Perspective for Enhancement of CO2 Sequestration

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• 作者：Sohrab Zendehboudi ; Asif Khan ; Stephen Carlisle ; Yuri Leonenko
• 刊名：Energy & Fuels
• 出版年：2011
• 出版时间：July 21, 2011
• 年：2011
• 卷：25
• 期：7
• 页码：3323-3333
• 全文大小：965K
• 年卷期：v.25,no.7(July 21, 2011)
• ISSN：1520-5029

文摘

A new methodology is proposed for the acceleration of CO₂ dissolution to lower the risk of CO₂ leakage for carbon capture and storage (CCS) technology. It is called ex situ dissolution because CO₂ is being dissolved at a surface before it is injected underground. This new approach reduces or eliminates possible leakage of CO₂ from underground formation. To achieve full underground dissolution of injected pure supercritical CO₂ or gaseous CO₂ may take thousands of years because of the absence of strong mixing (convective-diffusion dominated processes). Dissolving CO₂ in brine before injection significantly increases the security of geological sequestration. The mass transfer from CO₂ droplets into brine during cocurrent (CO₂鈥揵rine) horizontal pipe flow is studied mathematically to investigate the effectiveness of the proposed method. The dissolution rate of the CO₂ droplets is correlated to the variation of mean droplet diameter versus time, because the mass transfer causes shrinkage of the droplets. Empirical correlations based on Sherwood numbers were employed in the example for calculation of mass-transfer coefficients for droplets of CO₂ in the fluid flowing through a pipe.