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Effect of montmorillonite on hydrate-based methane separation from mine gas

蒙脱石对水合物法分离煤矿瓦斯中甲烷的影响

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Abstract

Three types of mine gas samples were used in the solutions of tetrahydrofuran (THF), sodium dodecyl sulfate (SDS) and THF-SDS with/without MMT respectively to investigate the effect of montmorillonite (MMT) on separation characteristics of methane recovered from mine gas based on hydrate method. The partition coefficient, separation factor and recovery rate were used to evaluate the effects of MMT, and the selection factor was primarily proposed to define the selectivity of mine gas hydrate in the relative target gases. The experimental results indicate that MMT could improve the following factors including hydration separation factor, the selection factor, the partition coefficient, and the recovery rate. Furthermore, the effect of SDS on the function of MMT is analyzed in the process of hydration separation. Finally, due to the results of the experiment, it is concluded that MMT hydration mechanism explores the effect of MMT enrichment methane from mine gas.

摘要

矿井瓦斯是以甲烷(CH4)为主的混合气体, CH4 是洁净、 高效的优质能源, 同时它也是对臭氧破坏能力极强的温室气体。 由于其浓度较低, 使得抽采瓦斯无法直接利用, 采用水合物法能够分离提纯抽采瓦斯中 CH4, 而该方法的关键科学问题是如何加快水合分离速率, 增大瓦斯水合物储气量, 提高 CH4 回收率。 蒙脱石(MMT)具有较好的吸附性和粘结性, 已有研究表明蒙脱石能够促进甲烷水合物形成。 据此针对 3 种瓦斯气样分别在 MMT-SDS、 MMT-THF、 MMT-SDS-THF 及空白体系中进行瓦斯水合分离实验, 考查了 MMT 对瓦斯水合分离效率、 CH4 回收率的影响规律。 结果表明: MMT 能够增大瓦斯水合分离因子和分配系数, 提高 CH4 回收率, 分析认为在瓦斯水合分离过程中, CH4 能够在 MMT 的特殊层间结构中形成水合物, 说明 MMT 对 CH4 具有选择性, 可提高瓦斯水合分离效率。 本文首次定义了选择因子, 以此参数评价水合物相对目标气体的富集能力, 实验结果表明 MMT 促进了 CH4 在水合物相中的富集。

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150080, China

    Qiang Zhang  (张强) & Hui Zhang  (张辉)

  2. Department of Safety Engineering, Heilongjiang University of Science & Technology, Harbin, 150022, China

    Qiang Zhang  (张强), Qiang Wu  (吴强) & Bao-yong Zhang  (张保勇)

  3. National Central Laboratory of Hydrocarbon Gas Transportation Pipeline Safety, Harbin, 150022, China

    Qiang Zhang  (张强), Qiang Wu  (吴强), Bao-yong Zhang  (张保勇) & Ting Xia  (夏婷)

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  1. Qiang Zhang  (张强)
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  2. Qiang Wu  (吴强)
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  3. Hui Zhang  (张辉)
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  4. Bao-yong Zhang  (张保勇)
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Correspondence to Hui Zhang  (张辉).

Additional information

Foundation item: Projects(51404102, 51334005, 51274267) supported by the National Natural Science Foundation of China; Project(UNPYSCT-2017140) supported by the Youth Innovation Personnel Training in University and College of Heilongjiang Province, China

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Zhang, Q., Wu, Q., Zhang, H. et al. Effect of montmorillonite on hydrate-based methane separation from mine gas. J. Cent. South Univ. 25, 38–50 (2018). https://doi.org/10.1007/s11771-018-3715-x

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  • DOI: https://doi.org/10.1007/s11771-018-3715-x

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