Free radical reaction characteristics of coal low-temperature oxidation and its inhibition method.
Study on the mechanism of coal spontaneous combustion is significant for controlling fire disasters due to coal spontaneous combustion. The free radical reactions can explain the chemical process of coal at low-temperature oxidation. Electron spin resonance (ESR) spectroscopy was used to measure the change rules of the different sorts and different granularity of coal directly; ESR spectroscopy chart of free radicals following the changes of temperatures was compared by the coal samples applying air and blowing nitrogen, original coal samples, dry coal samples, and demineralized coal samples. The fragmentation process was the key factor of producing and initiating free radical reactions. Oxygen, moisture, and mineral accelerated the free radical reactions. Combination of the free radical reaction mechanism, the mechanical fragmentation leaded to the elevated CO concentration, fracturing of coal pillar was more prone to spontaneous combustion, and spontaneous combustion in goaf accounted for a large proportion of the fire in the mine were explained. The method of added diphenylamine can inhibit the self-oxidation of coal effectively, the action mechanism of diphenylamine was analyzed by free radical chain reaction, and this research can offer new method for the development of new flame retardant.
Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.|School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.
Zenghua
Z
Li
Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China. kongbiao8807@163.com.|School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China. kongbiao8807@163.com.
Biao
B
Kong
School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610044,, China.
Aizhu
A
Wei
Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.|School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.
Yongliang
Y
Yang
Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.|School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.
Yinbo
Y
Zhou
Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.|School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.
Lanzhun
L
Zhang
D003031:Coal / Q000032:analysis; D003032:Coal Mining; D003080:Cold Temperature; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry
D003031:Coal; D005609:Free Radicals; D009584:Nitrogen; D010100:Oxygen
Coal; Flame retardant; Free radical; Inhibition method; Low-temperature oxidation; Mechanism