文献类型：期刊文献

英文题名：Effects of pore structure and methane adsorption in coal with alkaline treatment

作者：Zhou, Yinbo[1,2];Zhang, Ruilin[1,2];Huang, Jilei[3];Li, Zenghua[4];Zhao, Zhou[1];Zeng, Zhu[1,2]

第一作者：Zhou, Yinbo

通讯作者：Zhou, YB[1];Zeng, Z[1]

机构：[1]Henan Univ Engn, Sch Safety Engn, Zhengzhou 451191, Henan, Peoples R China;[2]Henan Engn Lab Technol & Equipment Res Gas Contro, Zhengzhou 451191, Henan, Peoples R China;[3]Henan Univ Econ & Law, Coll Resources & Environm, Zhengzhou 450046, Henan, Peoples R China;[4]China Univ Min & Technol, Minist Educ, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Jiangsu, Peoples R China

第一机构：Henan Univ Engn, Sch Safety Engn, Zhengzhou 451191, Henan, Peoples R China

通讯机构：[1]corresponding author), Henan Univ Engn, Sch Safety Engn, Zhengzhou 451191, Henan, Peoples R China.

年份：2019

卷号：254

外文期刊名：FUEL

收录：;EI(收录号：20192407053898);Scopus(收录号：2-s2.0-85067106024);WOS:【SCI-EXPANDED(收录号:WOS:000476980200053)】；

基金：The authors are grateful to the National Natural Science Foundation of China (No. 51804098, No. 51474094) and the Key Scientific Research Projects in Colleges and Universities of Henan (No. 19A440001, No. 19B440001, No. 18A440006).

语种：英文

外文关键词：Pore structure; Alkaline treatment; Methane; Fractal theory; Adsorption

摘要：Coal bed methane (CBM) is an important type of clean energy, but it can also result in coal mining disasters. Increasingly more technologies have been applied to improve the effectiveness of gas extraction. Coal contains a large number of organic minerals and inorganic minerals, and some inorganic minerals fill in pores and block the gas seepage. To improve the connectivity of coal pores, chemical methods can be used to change the distribution of the minerals in coal. In this paper, representative bituminous (TY) and anthracite (QC) are used, and an alkaline solution is also used to treat the coal samples. The SEM results show that some minerals in coal can be dissolved in alkaline solution and removed from the pores, thereby changing the distribution of the minerals. According to the LTNA test, the micropore content of coal is changed, especially in the pore size range of 2-5 nm. With the alkaline treatment, the average aperture decreases and the specific surface area increases. Fractal theory was used to analyze the data with relative pressure (P/P-0) less than 0.5. The results showed that the fractal dimension of the coal sample increased after the alkaline treatment, which indicated that the micropore content of the coal sample increased due to alkaline erosion. To verify the pores changes, adsorption experiments were carried out to analyse the adsorption capacity of the coal samples. After the alkaline treatment, the maximum sorption capacity and Langmuir-like pressure both increased. CO2 injection is an effective technology to displace CBM, but it easy to leave a great deal of CO2 in coal. The residual CO2 could be reduced by injecting an alkaline solution, and the coal would also be eroded. Based on the results, a new method combining CO2 injection and an alkaline treatment was proposed to improve the effectiveness of the gas control.