Oxidation and exothermic properties of long flame coal spontaneous combustion under solid-liquid-gas coexistence and its microscopic mechanism analysis

被引：30

作者：

Pan, Rongkun ^{[1
,2
,3
]}

Hu, Daimin ^{[1
]}

Chao, Jiangkun ^{[1
]}

Han, Xuefeng ^{[1
]}

Jia, Hailin ^{[1
,2
,3
]}

Li, Cong ^{[1
]}

机构：

[1] Henan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Peoples R China

[2] Henan Polytech Univ, Collaborat Innovat Ctr Coal Work Safety & Clean Hi, Jiaozuo 454003, Peoples R China

[3] Henan key Lab prevent & cure mine methane & fires, Jiaozuo 454003, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2023年 / 895卷

关键词：

Coal spontaneous combustion; Solid-liquid-gas; Heat release intensity; Heat flow; Coal oxidation; MOISTURE-CONTENT;

D O I：

10.1016/j.scitotenv.2023.165206

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Coal spontaneous combustion (CSC) wastes valuable resources and does great damage to the environment. To study the oxidation and exothermic properties of CSC under solid-liquid-gas coexistence conditions, a C600 microcalorimeter was used to analyze the heat released by the oxidation of raw coal (RC) and water immersion coal (WIC) under different air leakage (AL) conditions. The experimental results showed that the AL was negatively correlated with the heat release intensity (HRI) in the initial stages of coal oxidation, but as the oxidation proceeded, the AL and the HRI gradually showed positive correlations. The HRI of the WIC was lower than that of the RC under the same AL conditions. However, since water participated in the generation and transfer of free radicals in the coal oxidation reaction and promoted the development of coal pores, the HRI growth rate of the WIC was higher than that of the RC during the rapid oxidation period, and the self-heating risk was higher. The heat flow curves for the RC and WIC in the rapid oxidation exothermic stage could be fitted with quadratic functions. The experimental results provide an important theoretical basis for the prevention of CSC.

引用

页数：9