多孔介质与SDS复配体系中天然气水合物生成过程分析

doi:10.16085/j.issn.1000-6613.2017-1459

摘要/Abstract

摘要： 天然气水合物巨大的储量和本身高储气量的特点，决定了其在能源和工业领域的重要作用。自然界中水合物赋存于沉积层多孔介质的孔隙中，因而研究其在多孔介质条件下的基础物性和快速生成，对水合物的工业应用具有重要意义。为此，本文采用了不同粒径的多孔氧化铝颗粒和实心二氧化硅颗粒，并将其与十二烷基硫酸钠（SDS）溶液进行复配，研究该体系中275.15K和7MPa条件下水合物的生成情况。结果表明：多孔介质与SDS复配体系中生成水合物的储气量大于纯SDS溶液中，二氧化硅颗粒和氧化铝颗粒分别在促进水合物成核和提升储气量方面效果显著；实验条件下颗粒粒径对于水合物生成的压降过程和相平衡条件影响不大；实验所处pH条件下，氧化铝表面会因为水解带正电，二氧化硅表面则会在极化和水合作用的共同影响下带负电，带电表面和SDS的相互作用能够促进水合物的生成；多孔介质孔隙产生的毛细作用力及其对体系传热条件的改善有助于水合物的贴壁生成。因此可以认为多孔介质与表面活性剂复配体系对水合物生成的促进效果明显，并且将多孔材料作为水合物生成的基质是一种提高储气量的有效方法。

关键词: 天然气水合物, 多孔介质, 表面活性剂, 粒径, 诱导时间, 双电层模型

Abstract: Natural gas hydrate has an important role in energy and industry fields because of its huge reserves and high gas storage capacity, it is present in the pores of the porous media in the sedimentary layer under natural conditions, so it is of great significance to study the rapid formation and basic properties of the hydrate in the porous medium. And thus, porous alumina and solid silica particles with different particle size compounded with SDS solution were used to study the hydrate formation in the system at 275.15K and 7MPa. The following results are revealed. Firstly, the storage capacity of the hydrate in the porous medium and the SDS complex system is larger than that in the pure SDS solution. The silica particles and the alumina particles have significant effect in the hydration of the hydrate and the gas storage capacity respectively. Secondly, the particle size has no obvious effect on the pressure drop process of hydrate formation. Under the experimental conditions, the particle size has little influence on the equilibrium condition of hydrate. Thirdly, experiments in which the pH conditions, the surface of alumina will be positively charged because of hydrolysis and the surface of silica will be negatively charged under the combined influence of polarization and hydration, the interaction of charged surface and SDS can promote hydrate formation; Finally, the capillary force produced by pores in porous media and its improvement on the heat transfer conditions contribute to the hydrate formation on the wall. So, it can be concluded that the effect of the porous media and the surfactant compound system on the hydrate formation is remarkable, and the use of the porous material as a hydrate-forming matrix is an effective way to increase the gas storage capacity.

Key words: natural gas hydrate, porous media, surfactants, grain size, induction time, electric double layer model

中图分类号:

TE89

刘志明, 商丽艳, 潘振, 孙秀丽, 王喆, 侯朋朋. 多孔介质与SDS复配体系中天然气水合物生成过程分析[J]. 化工进展, 2018, 37(06): 2203-2213.

LIU Zhiming, SAHNG Liyan, PAN Zhen, SUN Xiuli, WANG Zhe, HOU Pengpeng. Analysis of natural gas hydrate formation process in porous media and SDS complex system[J]. Chemical Industry and Engineering Progress, 2018, 37(06): 2203-2213.

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