Predicting Possible Effects of H2S Impurity on CO2 Transportation and Geological Storage

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• 作者：Xiaoyan Ji ; Chen Zhu
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：January 2, 2013
• 年：2013
• 卷：47
• 期：1
• 页码：55-62
• 全文大小：484K
• 年卷期：v.47,no.1(January 2, 2013)
• ISSN：1520-5851

文摘

For CO₂ geological storage, permitting impurities, such as H₂S, in CO₂ streams can lead to a great potential for capital and energy savings for CO₂ capture and separation, but it also increases costs and risk management for transportation and storage. To evaluate the cost鈥揵enefits, using a recently developed model (Ji, X.; Zhu, C. Geochim. Cosmochim. Acta 2012, 91, 40鈥?9), this study predicts phase equilibria and thermodynamic properties of the system H₂S鈥揅O₂鈥揌₂O鈥揘aCl under transportation and storage conditions and discusses potential effects of H₂S on transportation and storage. The prediction shows that inclusion of H₂S in CO₂ streams may lead to two-phase flow. For H₂S鈥揅O₂ mixtures, at a given temperature, the bubble and dew pressures decrease with increasing H₂S content, while the mass density increases at low pressures and decreases at high pressures. For the CO₂鈥揌₂S鈥揌₂O system, the total gas solubility increases while the mass density of the aqueous solution with dissolved gas decreases. For the CO₂鈥揌₂S鈥揌₂O鈥揘aCl system, at a given temperature, pressure and NaCl concentration, the solubility of the gas mixture in aqueous phase increases with increasing H₂S content and then decreases, while the mass density of aqueous solution decreases and may be lower than the mass density of the solution without gas dissolution.