电场对煤表面结构及瓦斯吸附性的影响

发布时间：2018-06-28 07:45

本文选题：瓦斯 + 吸附性　；参考：《煤炭学报》2016年11期

【摘要】：采用直流电场作为物理场,利用已研制的电场作用下煤的瓦斯吸附试验装置,对电压作用下煤的瓦斯吸附性进行了试验研究,对电压作用前后试验煤样表面结构进行了XPS能谱测试,对煤样表面结构C元素含氧官能团的种类及其相对含量进行了分析,目的是基于煤表面结构揭示电场作用对煤的瓦斯吸附性影响机理。试验结果表明:电压作用可以弱化煤的瓦斯吸附性,在80 k Hz/1 k V,80 k Hz/3 k V和80 k Hz/5 k V电场作用下,煤表面结构C元素含氧官能团发生改性,C—C/C—H键相对含量从47.22%减少到24.95%,生成C—O键、C=O羰基官能团、COO—羧基或醌官能团,使得这3种含氧官能团相对含量增加,其最大值分别为54.44%,13.89%和7.39%;随着煤表面结构C元素C—C/C—H键相对含量的减少,煤的瓦斯饱和吸附量a呈线性规律减小,吸附常数b呈指数规律减小;与电场作用前相比,作用后煤总孔面积、中值孔径(体积)、中值孔径(面积)和平均孔径等孔隙结构参数均增加。
[Abstract]:Using DC electric field as physical field, the gas adsorption test device of coal under the action of electric field has been developed, and the gas adsorption property of coal under the action of voltage has been studied experimentally. The surface structure of coal samples before and after the voltage action was measured by XPS energy spectrum. The types and relative contents of oxygen functional groups of C elements in the surface structure of coal samples were analyzed. The purpose of this paper is to reveal the influence mechanism of electric field action on coal gas adsorption based on coal surface structure. The experimental results show that the gas adsorption of coal can be weakened by the voltage action under the electric field of 80 Hz / 1 kV / 80 k Hz / 3 kV and 80 k Hz / 5 kV electric field. The relative content of C / C / C-H bond of C element in coal surface structure was reduced from 47.22% to 24.95%, and the COO- carboxyl or quinone functional group was formed, which resulted in the increase of the relative content of the three oxygen-containing functional groups. The maximum values were 54.44% and 7.39%, respectively. With the decrease of the relative content of C-C / C-H bond on coal surface structure, the saturated adsorption capacity a of coal decreased linearly, and the adsorption constant b decreased exponentially, compared with that before the electric field. The pore structure parameters such as total pore area, median pore size (volume), median pore size (area) and average pore size are increased after action.
【作者单位】：太原理工大学矿业工程学院;太原科技大学环境与安全学院;山西煤炭运销集团科学技术研究有限公司;
【基金】：山西省自然科学基金资助项目(2015011054)
【分类号】：TD712

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