Citation

Lou H, Jia T. China Saf. Sci. J. 2019; 29(11): 77-82.

Copyright

(Copyright © 2019, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2019.11.013

PMID

unavailable

Abstract

To characterize the thermal characteristics of coal spontaneous combustion in gas atmosphere, the thermal gravimetric analysis and differential scanning calorimetry (TG-DSC) were used to study the process of coal spontaneous combustion under different gas volume fractions. The change of parameters such as characteristic temperature, weight loss and heat release of coal spontaneous combustion under the influence of gas were analyzed. The dynamic parameters of weight gain and combustion stages of coal in gas atmosphere were obtained. The results show that with the increase of gas volume fraction, the weight loss and heat release decrease and the coal-oxygen recombination rate slowes, that the process of coal spontaneous combustion is divided into three stages: evaporation desorption, weight gain and combustion, that activation energy and activation factor increase with the increase of gas volume fraction in the low temperature oxidation stage of coal, but the whole change is not obvious, and that activation energy and activation factor decrease with the increase of gas volume fraction in the combustion stage of coal. © 2019 China Safety Science Journal. All rights reserved.

Language: zh