地下煤火穿透煤体传播过程中影响气体产物释放的关键活性基团演化特征

IF 4.7 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Jingyu Zhao , Chen Wang , Jiajia Song , Shiping Lu , Tinghao Zhang , Chi-Min Shu , Xianglei Yuan , Gang Liu
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引用次数: 0

摘要

煤层自燃过程中裂隙的发育使氧气不断向煤层深处扩散,从而促进了煤火向下传播。为了研究CSC在煤体中传播过程中影响气体产物释放的关键活性基团的演化,构建了一个半封闭系统来模拟CSC的深度传播。利用原位红外光谱分析了不同深度煤样中活性基团的浓度。采用灰色关联分析方法,量化不同煤层瓦斯浓度与煤中关键活性基团含量之间的关联关系。结果表明:随着CSC的深入,不同煤深CO、CH4和C2H4的浓度呈指数增长后下降;在所有煤层中,第4层的保热性最高,是最容易发生CSC的层。随着煤温的升高,浅层煤主要发生脂肪烃氧化,而深层煤在达到着火温度后发生强烈氧化。当煤温从临界温度升高到着火温度时,影响瓦斯释放的关键官能团逐渐由甲基和醚基变为亚甲基和羰基。在煤的高温下,羰基和亚甲基的裂解反应成为主要的气体来源。分子间氢键通过改变煤体孔隙结构间接促进瓦斯释放。本研究可为理解CSC灾害机制提供新的视角和理论基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evolutionary characteristics of key active groups affecting the release of gaseous products during the propagation of an underground coal fire through a coal body
The development of fissures during the process of coal spontaneous combustion (CSC) allows oxygen to continuously diffuse into deeper coal layers, thereby promoting the downward propagation of coal fires. To investigate the evolution of key active groups affecting the release of gaseous products during the propagation of CSC through a coal body, a semienclosed system was constructed to simulate the deep propagation of CSC. The concentrations of active groups in coal samples at different depths were analysed using in-situ infrared spectroscopy. Grey relational analysis was employed to quantify the correlations between the gas concentrations in different coal layers and the contents of key active groups in coal. The results indicated that, as CSC propagated deeper, the concentrations of CO, CH4, and C2H4 at different coal depths increased exponentially before declining. Of all coal layers, the fourth layer had the highest heat retention, making it the layer most prone to CSC. As the coal temperature was increased, shallow coal layers primarily underwent aliphatic hydrocarbon oxidation, whereas deep coal layers exhibited intense oxidation after the ignition temperature was reached. When the coal temperature was increased from the critical temperature to the ignition temperature, the key functional groups influencing gas release gradually changed from methyl and ether groups to methylene and carbonyl groups. At high coal temperature, the cleavage reactions of carbonyl and methylene groups became the dominant sources of generated gases. Moreover, intermolecular hydrogen bonds indirectly promoted gas release by altering the pore structure of the coal body. This study can provide a new perspectives and a theoretical foundation for understanding the mechanisms of CSC disasters.
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来源期刊
Materials Chemistry and Physics
Materials Chemistry and Physics 工程技术-材料科学:综合
CiteScore
8.70
自引率
4.30%
发文量
1515
审稿时长
69 days
期刊介绍: Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.
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