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泥岩对煤自燃特性的影响及氧化动力学分析

Influence of mudstone on coal spontaneous combustion characteristics and oxidation kinetics analysis.

作者信息

Zhang Xun, Zou Jiahui, Lu Bing, Bai Gang, Qiao Ling

机构信息

College of Mining, Liaoning Technical University, FuxinLiaoning, 123000, China.

Institute of Safety Engineering and Technology, Liaoning Technical University, FuxinLiaoning, 123000, China.

出版信息

Sci Rep. 2024 Apr 28;14(1):9744. doi: 10.1038/s41598-024-59797-8.

DOI:10.1038/s41598-024-59797-8
PMID:38679606
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11056369/
Abstract

To explore the spontaneous combustion characteristics and hazards of the low-temperature oxidation (LTO) stage in the process of spontaneous combustion of coal and mudstone, the pore structure, spontaneous combustion characteristic parameters, and exothermic characteristics of coal and mudstone were tested and studied, and the oxidation kinetic parameters were calculated. The results show that mudstone has a larger specific surface area and pore volume than coal. From the fractal characteristics, the pore structure of mudstone is more complex than that of coal. According to the comparison of theoretical and actual gas generation and oxygen consumption rate curves, it is found that there is an interaction between coal and mudstone in the LTO process. With the increase of mudstone mass ratio, gas production, and its oxygen consumption rate increase. Among them, CM-4 (Coal:Mudstone = 1:1) has the highest exothermic intensity and the exothermic factor (A) and fire coefficient (K) increase with the increase of mudstone content. The apparent activation energy of the mudstone sample is lower than that of the raw coal, indicating that the sample after adding mudstone is more likely to have spontaneous combustion in the LTO stage.

摘要

为探究煤与泥岩自燃过程中低温氧化（LTO）阶段的自燃特性及危害，对煤与泥岩的孔隙结构、自燃特征参数和放热特性进行了测试研究，并计算了氧化动力学参数。结果表明，泥岩比煤具有更大的比表面积和孔隙体积。从分形特征来看，泥岩的孔隙结构比煤更复杂。通过理论与实际产气量及耗氧率曲线对比发现，在低温氧化过程中煤与泥岩之间存在相互作用。随着泥岩质量比的增加，产气量及其耗氧率增大。其中，CM - 4（煤∶泥岩 = 1∶1）放热强度最高，且放热因子（A）和着火系数（K）随泥岩含量增加而增大。泥岩样品的表观活化能低于原煤，表明添加泥岩后的样品在低温氧化阶段更易发生自燃。

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