| 火成岩侵蚀煤层易自然发火特性及关键致因研究 |
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| 引用本文： | 秦波涛,史全林,曲宝,刘金龙. 火成岩侵蚀煤层易自然发火特性及关键致因研究[J]. 矿业科学学报, 2023, 8(1): 15-25. DOI: 10.19606/j.cnki.jmst.2023.01.002 |
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| 作者姓名： | 秦波涛 史全林 曲宝 刘金龙 |
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| 作者单位： | 1.煤矿瓦斯与火灾防治教育部重点实验室，江苏徐州 221116 |
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| 基金项目： | 国家杰出青年科学基金51825402国家自然科学基金青年基金52004278江苏省自然科学基金BK20200658 |
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| 摘 要： | 为探明火成岩侵蚀导致侵蚀煤层自燃特性变化的关键致因，以受火成岩侵入范围广、煤自然发火严重的铁法煤田大兴煤矿为研究对象，采集火成岩侵蚀形成的变质煤和未受影响的原生煤进行研究。本文利用同步热分析仪、煤自燃特性测定装置等测试了煤样的产热升温特性、气体产生规律、微观结构参数的差异。结果表明，变质煤在低温阶段的放热量较原生煤显著提高，交叉点温度降低了13.2℃,更早进入氧化增重阶段；当环境温度超过90℃,变质煤的氧化产热与反应速率急速增加，CO和CO2等氧化气体产物生成速率显著升高，表明变质煤的氧化活性高于原生煤；火成岩侵蚀煤层的高温高压作用改变了煤体的孔隙结构，导致煤中有机物质热解与挥发，使得变质煤中的微孔和介孔孔容减小、比表面积降低，宏观孔的孔容达到原生煤的3倍，平均孔径和孔隙率显著增大，有利于氧气分子在煤体内部的输送运移与吸附反应，同时变质煤的含氧官能团较原生煤减少，脂肪烃含量由27.98%提高至29.07%,增强了变质煤的氧化活性。此外，火成岩侵蚀活动导致侵蚀煤层开采时漏风加剧、遗煤氧化时间长、氧化带范围广。火成岩对煤层自然发火内在因素和外在因素的影响，导致侵蚀煤层...
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| 关 键 词： | 火成岩侵蚀 煤自燃 产热 关键致因 物化结构 |
| 收稿时间： | 2022-07-21 |
The key causes and characteristics of spontaneous combustion of coal seams affected by igneous intrusion |
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| Affiliation: | 1.Key Laboratory of Coal Methane and Fire Control, Ministry of Education, Xuzhou Jiangsu 221116, China2.School of Safety Engineering, China University of Mining and Technology, Xuzhou Jiangsu 221116, China3.Daxing Coal Mine, Tiefa Coal Industry Group Co., Ltd., Diaobingshan Liaoning 112700, China |
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| Abstract: | In order to find out the key causes of changes in spontaneous combustion characteristics of igneous intrusive coal seams, this paper took the Daxing Coal Mine in Tiefa Coalfield as example for analysis, which was widely invaded by igneous and had serious coal spontaneous combustion disasters.Metamorphic coal and unaffected primary coal were collected from the study area.Specifically, this paper studied the patterns of heat production and temperature rise, gas production rules, and microscopic structure parameters of coal samples by synchronous thermal analyzer and coal spontaneous combustion characteristic measuring device.The experimental results show that the igneous intrusion caused the mutation in the spontaneous combustion characteristics of the coal.Compared with the primary coal, there was significantly higher oxidation heat release of the metamorphic coal at the low temperature stage.Also, the crossing point temperature of metamorphic coal was reduced by 13.2 ℃, and it entered the stage of oxidation and weight gain earlier than the primary coal.When the environment temperature exceeded 90 ℃, the oxidation heat generation and reaction rate of metamorphic coal increased rapidly, which showed higher oxygen consumption rate and faster generation rate of oxidative gas products such as CO and CO2.This demonstrated higher oxidation activity of metamorphic coal than that of primary coal.The analytic results of physicochemical microstructure showed that the high temperature and pressure of igneous intrusion changed the pore structure of coal, which reduced the pore volume and specific surface area of micropores/mesopores in metamorphic coal, and the pore volume of macropores was three times higher than that of primary coal.The average pore size and porosity increased significantly, which was conducive to the transport, migration and adsorption reaction of oxygen molecules in the coal structure.At the same time, igneous intrusion reduced the oxygen-containing functional groups of metamorphic coal, and the content of aliphatic hydrocarbons with higher activity increased from 27.98 % to 29.07 %, which enhanced the oxidative activity of metamorphic coal.Moreover, igneous intrusion caused problems such as increased air leakage, long oxidation time of left coal, and wide oxidation zone during the mining, eventually leading to severe coal spontaneous combustion disasters. |
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