Citation

Lou H, Jia T. China Saf. Sci. J. 2020; 30(4): 60-67.

Copyright

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

DOI

10.16265/j.cnki.issn1003-3033.2020.04.010

PMID

unavailable

Abstract

In order to explore spontaneous combustion characteristics in low temperature oxidation process of coal after absorption in CO2 and N2 atmospheres, with anthracite coal in No. 9 coal seam of Sihe No. 2 mine taken as research object, warming test and TG test of coal during low temperature oxidation were conducted to analyze gas product characteristics and weight loss characteristics of CO and CH4 during spontaneous combustion of coal. Then, a physical adsorption model of different gas molecules, such as O2, CO2 and N2, was established on the surface of coal macromolecules, and adsorption of O2 gas molecules was analyzed from a micro perspective using grand canonical Monte Carlo simulation (GCMC) method. Finally, difference in competitive adsorption between mixed gas molecules on surface of coal macromolecules were discussed. The research shows that spontaneous combustion characteristics of coal in low temperature oxidation process change after adsorption in CO2 and N2 atmospheres, with concentration of CO and CH4 gas products being reduced and rate of weight loss of coal spontaneous combustion decreasing, thus inhibiting low temperature oxidation capacity of coal. The mixed adsorption of coal macromolecules on gas molecules, like CO2 and N2, suppresses their adsorption of O2 molecules. And gas competitive adsorption on coal surface ranks as H2O>CO2>N2>O2>CH4>CO. © 2019 China Safety Science Journal

Language: zh