岩浆侵入煤系地层在我国广泛存在，探究岩浆侵入作用对煤低温氧化特性的影响，对开采岩浆侵入煤层自燃灾害的防控具有重要意义。本文以现场地质背景为依据，结合理论分析和实验测试对岩浆侵入区煤自燃特性进行研究，以新安矿二采区负350工作面的变质煤以及原煤为研究对象，系统地开展了煤体基础物性参数与岩浆作用规律研究，岩浆侵入区变质煤微观结构研究，岩浆侵入区变质煤低温氧化热效应研究，岩浆侵入区煤自燃预测指标研究，为防治岩浆侵入区煤自燃工作提供理论支持。

通过工业分析与镜质组反射率测试，发现变质煤的物化性质发生较大变化，包括变质煤中水分、挥发分随距岩浆岩距离增加呈递增趋势，灰分、固定碳、镜质组反射率随距岩浆岩距离增加呈递减趋势。将变质煤分为强侵蚀煤、弱侵蚀煤、同镜质组高阶煤，并以变质煤的物性参数作为预测指标，以原煤的物性参数为极限指标，预测出岩浆的侵入作用范围大约为15.17m~20.03m，为此区域岩浆含量(宽度9.4m)的161.38%~213.09%。

通过扫描电镜和压汞测试定性定量地研究了变质煤与原煤的孔隙结构，发现变质煤表面粗糙具有更多的裂隙，出现较多的脱挥发孔，原煤的表面相对平整，没有明显的裂隙；变质煤的比表面积降低，但变质煤的总孔体积升高，且随距岩浆岩距离的增加而减小，强侵蚀煤的渗流孔体积约占总孔体积的94.27%，弱侵蚀煤与同镜质组高阶煤为93.53%和91.19%，原煤仅为89.29%；通过红外光谱测试结果可知，变质煤的苯环多取代基增多，减少了煤体芳香结构中氢原子的数量，由于岩浆的高温灼烧以及矿物元素迁移，导致变质煤中矿物质及灰分多于原煤，变质煤中芳基与烷基醚键C-O减少，羰基C=O含量升高，变质煤的脂肪结构不如原煤稳定，且芳环C=C随距岩浆侵入体距离的增加而降低，岩浆侵入提升了煤化程度。

通过C80微量热测试分析了变质煤与原煤低温氧化热效应的差异，发现在相同升温速率条件下变质煤的特征温度点提前，放热量高于原煤约8.23%~352.3%，表观活化能低于原煤约18.49%~82.41%；在不同供风量条件下变质煤的放热量高于原煤约1.72%~135.76%，表观活化能低于原煤约1.62%~69.02%，岩浆侵入对煤低温氧化起到的促进作用主要体现在强侵蚀煤区域，在不同升温速率和供风量条件下，变质煤与原煤的放热量与氧化活性总体趋势为强侵蚀煤>弱侵蚀煤>同镜质组高阶煤>原煤，但强侵蚀煤受到风量的影响较为剧烈，在供风量为100mL/min时的放热量最高，且更易与氧气反应，放热能力更强。

通过程序升温实验分析变质煤与原煤的气体产物差异，发现变质煤具有更多的原生CO、CO₂以及CH₄气体，C₂H₆和C₂H₄的初现温度均低于原煤，变质煤达到快速氧化阶段所需的温度更低，在相同的实验条件下，变质煤的耗氧速率以及CO生成速率均高于原煤，变质煤的自然发火危险性高于原煤，因此，确定了CO、C₂H₆、C₂H₄、R₂、C₂H₆/CH₄作为岩浆侵入区煤自燃主要预报指标，R₁、R₃、C₂H₄/C₂H₆作为岩浆侵入区煤自燃辅助预报指标。

Magma intrusion into coal beds is widely existed in China, and it is of great significance to investigate the influence of magma intrusion on the low-temperature oxidization characteristics of coal, and to prevent and control the spontaneous combustion disaster of magma intrusion into coal beds in mining. Based on the geological background of the site, combined with theoretical analysis and experimental tests to study the spontaneous combustion characteristics of coal in the magma intrusion area, and taking the metamorphic coal in the -350 working face of the second mining area of Xin'an Mine and the raw coal as the research objects, we have systematically carried out the research on the basic physical parameters of the coal body and the law of magma action, the research on the microstructure of the metamorphic coal and the raw coal in the magma intrusion area, the research on the low-temperature oxidization thermal effect of the metamorphic coal and the raw coal in the magma intrusion area. In addition, the research on early warning indicators of spontaneous combustion of coal in magma intrusion areas has been carried out to provide theoretical support for the prevention and control of spontaneous combustion of coal in magma intrusion areas.

Through industrial analysis and specular group reflectance test, it was found that the physical and chemical properties of the metamorphic coal changed greatly, including moisture and volatile matter in the metamorphic coal showed an increasing trend with the increase of the distance from the magma rock, and ash, fixed carbon, and specular group reflectance showed a decreasing trend with the increase of the distance from the magma rock. The metamorphic coals were categorized into strongly eroded coals, weakly eroded coals, and high rank coals of the same specular group, and the range of magma intrusion effect was predicted to be about 15.17m~20.03m, which is 161.38%~213.09% of the magma content in this area (width of 9.4m), by using the physical parameters of the metamorphic coals as a prediction index, and using the physical parameters of the raw coals as a limiting index.

The pore structure of the metamorphic coal and the raw coal was studied qualitatively and quantitatively by scanning electron microscopy and piezometric mercury test, and it was found that the surface of the metamorphic coal was rough with more fissures and appeared more de-volatilized pores, while the surface of the raw coal was relatively flat and had no obvious fissures. The specific surface area of the metamorphic coal decreased, but the total pore volume of the metamorphic coal was elevated and decreased with the increase of the distance from the magma rock, and the seepage pore volume of the strongly eroded coal accounted for about 94.27% of the total pore volume, that of the weakly eroded coal and the high rank coal of the same specular group was 93.53% and 91.19%, and that of the raw coal was only 89.29%. The results of infrared spectroscopy test show that the metamorphic coal has more benzene ring polysubstituents, which reduces the number of hydrogen atoms in the aromatic structure of the coal body; due to the high temperature burning of the magma and the migration of the mineral elements, the minerals and ash in the metamorphic coal are more than that of the raw coal; the aryl and alkyl ether bonding C-O in the metamorphic coal decreases, and the content of the carbonyl group C=O is elevated, and the aliphatic structure of metamorphic coal is not as stable as that of the raw coal, and the aryl C=C decreases with the increase of the distance from the magmatic The fat structure of the metamorphic coal is not as stable as that of the raw coal, and the C=C of the aromatic ring decreases with the distance from the magma intrusion.

The differences in thermal effects of low-temperature oxidation between metamorphic coal and raw coal were analyzed by C80 microcalorimetry test, and it was found that the characteristic temperature point of metamorphic coal was advanced under the condition of the same warming rate, the exothermic capacity was higher than that of raw coal by about 8.23%~352.3%, and the apparent activation energy was lower than that of raw coal by about 18.49%~82.41%; under the condition of different air supply, the exothermic capacity of metamorphic coal was higher than that of raw coal by about 1.72%~135.76% and the apparent activation energy was lower than that of raw coal by about 1.62%~69.02%. 135.76%, and the apparent activation energy is lower than that of the raw coal by about 1.62%~69.02%. The promotion effect of magma intrusion on the low-temperature oxidation of coal is mainly reflected in the region of strongly eroded coal, and the overall trend of exothermic capacity and oxidizing activity of metamorphic coal and the raw coal under the conditions of different warming rate and air supply is strongly eroded coal>weakly eroded coal> high rank coals of the same specular group >raw coal, but the strongly eroded coal is more drastically affected by air supply. However, the strongly eroded coal was more violently affected by the air volume, and the exothermic capacity was the highest when the air volume was 100 mL/min, and it was easier to react with oxygen and had a stronger exothermic capacity.

The difference of gas products between metamorphic coal and raw coal was analyzed through the program heating experiment, and it was found that the metamorphic coal had more primary CO, CO₂ and CH₄ gases, and the initial temperatures of C₂H₆ and C₂H₄ were lower than those of raw coal, and the temperature required for the metamorphic coal to reach the intense oxidation stage was lower, and the rate of oxygen consumption as well as the rate of CO generation of the metamorphic coal was higher than that of the raw coal under the same experimental conditions, and the natural ignition risk of metamorphic coal was higher than that of the raw coal. Therefore, CO, C₂H₆, C₂H₄, R₂, C₂H₆/CH₄ were identified as the main prediction indicators for spontaneous combustion of coal in magma intrusion area, and R₁, R₃, C₂H₄/C₂H₆ were identified as auxiliary prediction indicators for spontaneous combustion of coal in magma intrusion area.

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