摘要
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.
矿井瓦斯是以甲烷(CH_4)为主的混合气体,CH_4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CH_4,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CH_4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、CH_4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CH_4回收率,分析认为在瓦斯水合分离过程中,CH_4能够在MMT的特殊层间结构中形成水合物,说明MMT对CH_4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CH_4在水合物相中的富集。
基金
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
