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Experimental study on the effect of pore size on carbon dioxide hydrate formation and storage in porous media

机译:孔径对多孔介质中二氧化碳水合物形成和存储影响的实验研究

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摘要

Hydrate method is feasible for solidification and storage of CO2 gas into stratum sediments. In order to study the storage process of carbon dioxide In the form of hydrate into seafloor sediments, the formation characteristics of carbon dioxide hydrate was investigated in porous media and the formation experiment of carbon dioxide hydrate has been conducted in quartz sand porous media in high-pressure vessel of 1.8 L with pore size of 26.7 nm, 14.2 nm and 13.8 nm, respectively. The results show that, pore size of porous media has an important influence on the formation characteristics of CO2 hydrate. Compared with porous media of 14.2 nm and 26.7 nm, the average formation rate and gas storage capacity of carbon dioxide hydrate attained 0.01328 mol/h and 53.558 L/L respectively. The results also indicated that, the smaller the pore size is, the longer the induction time and the larger the average formation rate and gas storage capacity of hydrate in porous media with pore size between 13.8 nm and 26.7 nm. It provided a theoretical guidance for solidification and storage of CO2 into seafloor sediments in the form of gas hydrate. (C) 2015 Elsevier B.V. All rights reserved.
机译:水合物法对于将二氧化碳气体固化和储存到地层沉积物中是可行的。为了研究二氧化碳以水合物形式向海底沉积物中的储存过程,研究了多孔介质中二氧化碳水合物的形成特征,并在高密度石英砂多孔介质中进行了二氧化碳水合物的形成实验。压力容器为1.8 L,孔径分别为26.7 nm,14.2 nm和13.8 nm。结果表明,多孔介质的孔径对CO2水合物的形成特征有重要影响。与14.2 nm和26.7 nm的多孔介质相比,二氧化碳水合物的平均生成速率和储气量分别达到0.01328 mol / h和53.558 L / L。结果还表明,孔径越小,诱导时间越长,水合物在孔径为13.8 nm至26.7 nm的多孔介质中的平均形成速率和储气量越大。它为以气体水合物形式将CO2固化和储存到海底沉积物中提供了理论指导。 (C)2015 Elsevier B.V.保留所有权利。

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