CO2 Hydrate Formation and Dissociation in Cooled Porous Media: A Potential Technology for CO2 Capture and Storage

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• 作者：Mingjun Yang ; Yongchen Song ; Lanlan Jiang ; Ningjun Zhu ; Yu Liu ; Yuechao Zhao ; Binlin Dou ; Qingping Li
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：September 3, 2013
• 年：2013
• 卷：47
• 期：17
• 页码：9739-9746
• 全文大小：381K
• 年卷期：v.47,no.17(September 3, 2013)
• ISSN：1520-5851

文摘

The purpose of this study was to investigate the hydrate formation and dissociation with CO₂ flowing through cooled porous media at different flow rates, pressures, temperatures, and flow directions. CO₂ hydrate saturation was quantified using the mean intensity of water. The experimental results showed that the hydrate block appeared frequently, and it could be avoided by stopping CO₂ flooding early. Hydrate formed rapidly as the temperature was set to 274.15 or 275.15 K, but the hydrate formation delayed when it was 276.15 K. The flow rate was an important parameter for hydrate formation; a too high or too low rate was not suitable for CO₂ hydration formation. A low operating pressure was also unacceptable. The gravity made hydrate form easily in the vertically upward flow direction. The pore water of the second cycle converted to hydrate more completely than that of the first cycle, which was a proof of the hydrate 鈥渕emory effect鈥? When the pressure was equal to atmospheric pressure, hydrate did not dissociate rapidly and abundantly, and a long time or reduplicate depressurization should be used in industrial application.