Citation

Chen L, Li X, Shen Z, Bi J, Liu Y, Xu S. China Saf. Sci. J. 2020; 30(2): 66-72.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.02.011

PMID

unavailable

Abstract

In order to reveal effects of outburst coal's pore structure on gas adsorption capacity and emission performance, low-temperature liquid nitrogen adsorption experiments of coal samples from three typical mines in northern Guizhou were carried out. Pore structure parameters were studied, including specific surface area, pore volume, average pore diameter, most probable pore diameter and fractal dimension, and gas diffusion pattern in pores was analyzed. Finally, impacts of pore characteristic parameters on adsorption capacity and emission performance was discussed. The results show that outburst coal's pores are relatively developed with pore permeability, and gas in pores mainly emits in transitional and Fick diffusion types. Compared with temperature, pressure and pore diameter have a more significant effect on Knudsen number. It is also found that pore characteristic parameters maintain a good linear relation with initial diffusion velocity of gas, and fractal characteristics of coal pore are evident. Adsorption capacity are quadratic function increasing while initial diffusion velocity of gas increases linearly with fractal dimension. © 2020 China Safety Science Journal. All rights reserved.

Language: zh