Citation

Chen X, Wang C, Zhai X. China Saf. Sci. J. 2022; 32(2): 59-65.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.02.009

PMID

unavailable

Abstract

In order to accurately decide ignition point of coal and improve prevention and control ability of spontaneous combustion disasters, according to TET and with consideration to heat release curve of spontaneous combustion process, the first minimum point on differential heat flow curve in the process was taken as ignition point, and dynamic parameters during heat release before and after ignition were calculated. The results show that along with increase in heating rate, exothermic process of coal spontaneous combustion gradually moves to high temperature regions, and ignition point also increases gradually, while activation energy of reaction decreases in the same manner. At the same heating rate, activation energy of coal increases after ignition, with the level of coal oxygen reaction being decreased to 1 after ignition point from 1. 5 before it. It is also found that oxygen combustion of coal after ignition is more sufficient, and spontaneous combustion is more difficult to control. © 2022, Editorial Department of China Safety Science Journal. All rights reserved.

Language: zh