探索火成岩侵蚀诱发的煤炭自燃特征和结构差异

Fire Pub Date : 2024-05-04 DOI:10.3390/fire7050159
Mingqian Zhang, Zongxiang Li, Zhifeng Chen, Lun Gao, Yun Qi, Haifeng Hu
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引用次数: 0

摘要

火成岩的侵蚀会影响煤的结构和自燃特性。对同一煤层内的塔山煤矿和小南煤矿的原生煤和火成岩侵蚀煤样品进行了一系列试验,包括程序加热、热重分析、傅立叶变换红外光谱、低温氮吸附和压汞实验。在这些实验的基础上,我们从宏观和微观角度分析了煤的各种特性,如氧化特性、自燃极限、活性官能团含量、化学结构和孔隙结构等。结果表明,火成岩侵蚀后煤的氧化特性呈明显变化趋势:(1) 耗氧率、CO 和 CO2 释放率增加;(2) 漏气强度上限增加,浮煤最小厚度减小,氧体积分数下限减小;(3) 煤着火所需的活化能减小;(4) 活性官能团含量减小,结构稳定性提高;(5) 煤的孔隙结构发生变化。这些都促进了煤基质中氧和活性基团之间的氧化反应,增加了自燃倾向,特别是在氧化活性较低的火成岩中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring Spontaneous Combustion Characteristics and Structural Disparities of Coal Induced by Igneous Rock Erosion
The erosion of igneous rocks affects the structural and spontaneous combustion characteristics of coal. A series of tests were conducted, including programmed heating, thermogravimetric analysis, FT-IR spectroscopy, low-temperature nitrogen adsorption, and pressed mercury experiments on samples from primary coal and coal eroded by igneous rocks from the Tashan Mine and Xiaonan Mine within the same coal seam. Based on these experiments, we analyzed various properties of coal, such as the oxidation characteristics, spontaneous combustion limit, active functional group content, chemical structure, and pore structure, from both macroscopic and microscopic perspectives. The results indicated significant trends after the erosion of igneous rocks: (1) there were increases in the oxygen consumption rate, as well as the CO and CO2 release rates; (2) the upper limit of air leakage intensity increased, the minimum thickness of floating coal decreased, and the lower limit of oxygen volume fraction decreased; (3) there was a decrease in the activation energy required for coal ignition; (4) there was a decrease in the active functional group content while improving the structural stability; and (5) there were the alterations in the pore structure of coal. These promoted the oxidation reactions between oxygen and the active groups within the coal matrix, increasing the propensity for spontaneous combustion, particularly in the igneous rocks with low oxidation activity.
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