Experimental verification of the mechanism of free radicals reactions in spontaneous combustion of coal

被引：0

作者：

Wei Aizhu ^{[1
]}

Li Zenghua ^{[1
]}

Yang Yongliang ^{[1
]}

机构：

[1] China Univ Min & Technol, Sch Min & Safety Engn, Xuzhou 221008, Jiangsu, Peoples R China

来源：

PROGRESS IN SAFETY SCIENCE AND TECHNOLOGY, VOL 6, PTS A AND B | 2006年 / 6卷

关键词：

coal; spontaneous combustion; free radicals; ESR; experimental verification;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to verify the correctness of free radicals reactions in spontaneous combustion of coal, electron spin resonance (ESR) spectroscopy was used to measure the parameters including Lande factors (g) and concentrations of paramagnetic centers (Ng) as well as linewidth (Delta H) of coal free radicals in the processes of fragmentation and oxygenation. The variations of these parameters under different particle size and different oxidative conditions were analyzed. The results show that g-values are mainly related to the,types of coal. Smaller particle size, higher oxidation temperature and longer oxidation time can lead to higher concentration of paramagnetic center. It can also be seen that the variation trend of Delta H is complicated. Finally, according to the experimental data, the reaction steps of free radicals are deduced and the relation between reaction of free radicals and spontaneous combustion of coal is proved.

引用

页码：1616 / 1619

页数：4

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