Effects of inhibitors on the sequestration of flue gas in goaf and pore structures of coal
Effects of inhibitors on the sequestration of flue gas in goaf and pore structures of coal
复制标题
抑制剂对采空区烟气封存及煤孔隙结构的影响
DOI：
10.1016/j.fuel.2021.122354
复制
发表时间：
2021-10-29
期刊：
影响因子：
7.4
通讯作者：
Jia, Zhe
中科院分区：
文献类型：
--
作者：
Gao, Fei;Xia, Ji;Jia, Zhe
将电厂烟气注入采空区封存，不仅可以减少CO2的排放，还可以有效抑制采空区遗留煤炭的自燃。为分析采空区化学环境对煤层CO2封存的影响，采用自制吸附实验装置和ASAP 2020比表面分析仪，研究了煤中CO2吸附规律及封存前后煤的孔隙结构。结果表明，抑制后煤对CO2的吸附量提高了14.05%-21.04%。抑制剂能显着提高煤中CO2的吸附能力，增强采空区烟气的封存能力。抑制剂后的煤样微孔孔容和比表面积较原煤较大，中孔和大孔孔容和比表面积较小，但微孔孔容和比表面积分别是中孔和大孔孔容和比表面积的4.3倍和205倍。由此可见，抑制后煤的总孔容和比表面积显着增加，这就是CO2吸附能力增加的原因。该抑制剂并没有从根本上改变煤的孔径分布，煤中的孔隙大部分在0.4-0.6、0.8-0.9、1.5-75和120-170 nm的孔径范围内，这对其孔体积和比表面积有很大贡献。孔径为
Injecting power plant flue gas into goaf for sequestration can not only reduce the emission of CO2, but can also effectively inhibit the spontaneous combustion of coal left in the goaf. To analyze the effect of the chemical environment in the goaf on the sequestration of CO2 in a coal seam, a home-made adsorption experiment device and ASAP 2020 specific surface analyzer were used to study the regularity of CO2 adsorption in coal and the pore structure of coal before and after inhibition. The results indicate that the adsorption capacity of CO2 in coal increased by 14.05%-21.04% after inhibition. The inhibitors can significantly increase the adsorption capacity of CO2 in coal, enhancing the sequestration of flue gas in goaf.The pore volume and specific surface area of micropores in the coal samples after inhibition are larger compared to those in the raw coal, whereas those of mesopores and macropores are smaller, but those of the micropores are 4.3 and 205 times those of mesopores and macropores, respectively. Thus, the total pore volume and specific surface area of coal increased significantly after inhibition, which is the reason for the increase of CO2 adsorption capacity. The inhibitor does not fundamentally change the pore size distribution of coal, most of the pores in coal are in the pore size range of 0.4-0.6, 0.8-0.9, 1.5-75, and 120-170 nm, which greatly contribute to its pore volume and specific surface area. The pores with a pore size of