Effect of Initial Pressure on the Formation of Carbon Dioxide Hydrate in Frozen Quartz Sand
2019
Zhang, Xuemin | Li, Jinping | Wu, Qingbai | Wang, Yingmei | Wang, Jiaxian | Li, Yang
Sequestration and storage of CO₂ in naturally occurring gas hydrate reservoirs is considered an effective strategy against global warming. In order to study the formation process of CO₂ hydrate simulating the permafrost environment, the experiment was carried out in high-pressure vessel frozen quartz sand. The formation characteristics of CO₂ hydrate were studied, and the influence of initial pressure on the hydrate formation process was discussed through experiments. The results showed that the formation rate of CO₂ hydrate increased with the increase of the initial pressure of CO₂ under the condition below the liquefied pressure. Furthermore, the formation rate of hydrate presented a similar change trend under the condition of the liquefied pressure. The results also indicated that the higher the initial pressure of CO₂, the higher the final conversion rate of hydrate. Under the condition below the liquefied pressure, the highest conversion rate of ice was 66.3%. Furthermore, the highest conversion rate of ice attained 72.8% under the condition of the liquefied pressure. These results will provide a theoretical guidance for sequestration and storage of CO₂ gas and exploitation of natural gas hydrate in permafrost regions.
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