由于煤油共生矿井中煤层局部含有原油，开采过程中存在油浸煤现象，这导致煤油共生矿井中煤尘燃爆风险与普通矿井存在差异。本文以黄陵矿样品为例，首先利用20L球型爆炸试验系统，研究了不同粒径、粉尘云浓度、浸油浓度下的油浸煤尘爆炸下限和爆炸压力特性。然后对油浸煤尘进行TG-DTG-DSC热分析实验测试，研究粒径、浸油浓度对油浸煤尘热效应的影响；对爆炸固体产物并进行扫描电镜和红外光谱等微观测试，对其微观形貌进行了表征。从热效应与微观特征的角度分析了油浸煤尘爆炸特性参数的变化。研究成果有助于提升对油浸煤尘燃爆的认识，对煤油共生矿区油浸煤尘燃爆防控具有一定现实意义。

随浸油浓度增加，50μm的油浸煤尘爆炸下限浓度呈现“M”型变化趋势，在6%浸油浓度下煤尘爆炸下限浓度有最小值，爆炸危险性增强。75μm和98μm的油浸煤尘爆炸下限浓度随浸油浓度增加呈现先上升后降低再上升趋势，6%浸油浓度下油浸煤尘爆炸下限浓度均处于最高值，爆炸危险性减弱。

随粒径增加，一定粉尘浓度下的油浸煤尘的最大爆炸压力和最大压力上升速率整体上均呈现出缓慢下降趋势，粒径越小最大爆炸压力和最大压力上升速率越大。随着浸油浓度增加，油浸煤尘最大爆炸压力与最大压力上升速率变化趋势不同，6%的浸油浓度对煤尘P_max和(dP/dt)_m的影响程度大于其他浸油浓度。

浸油浓度对煤尘热效应、爆炸固体产物微观形貌有明显影响，主要体现在：油浸煤尘燃烧总热量变化受粒径和浸油浓度的影响，随着浸油浓度增加，50μm和98μm的油浸煤尘总热量呈现“W”型变化趋势，75μm的油浸煤尘热总热量现先降低后升高再降低的变化趋势。当浸油浓度为6%时，不同粒径的油浸煤尘的燃烧总热量均最大，这在一定程度上解释了浸油浓度对煤尘最大爆炸压力的影响。浸油浓度为6%的煤尘爆炸固体产物球型颗粒大小相当且分布均匀，数量比其他浸油浓度下的多。在原煤和油浸煤尘爆炸过程中，芳香类官能团的变化主要体现在苯环上，苯环上发生了氢原子取代；含氧官能团官能团的变化主要是醚类结构参与了爆炸反应；羟基类官能团中OH-N和自由羟基主要参与了反应；参与反应的脂肪结构种类基本不变。

Because the coal seam in coal-oil coexisting mine contains crude oil locally, there is the phenomenon of oil immersed coal in the mining process, which leads to the difference of coal dust combustion and explosion risk between the coal-oil coexisting mine and the ordinary mine. Taking Huangling Mine sample as an example, firstly, the lower explosion limit and explosion pressure characteristics of oil-immersed coal dust under different particle size, dust cloud concentration and oil-immersed concentration are studied by using 20L spherical explosion test system. Then, TG-DTG-DSC thermal analysis experiment was carried out to study the effects of particle size and oil-immersed concentration on the thermal effect of oil-immersed coal dust. The explosive solid products were tested by scanning electron microscope and infrared spectrum, and their micro morphology was characterized. The variation of explosion characteristic parameters of oil-immersed coal dust is analyzed from the perspective of thermal effect and micro characteristics. The research results help to improve the understanding of oil-immersed coal dust combustion and explosion, and have certain practical significance for the prevention and control of oil-immersed coal dust combustion and explosion in coal-oil coexisting mining areas.

With the increase of oil-immersed concentration, the lower explosion limit concentration of 50 μm oil-immersed coal dust shows an “M” trend. At 6% oil-immersed concentration, the lower explosion limit concentration of coal dust has a minimum value, and the explosion risk is enhanced. To 75 μm and 98 μm, the lower explosion limit concentration of oil-immersed coal dust increases first, then decreases and then increases with the increase of oil-immersed concentration. Under 6% oil-immersed concentration, the lower explosion limit concentration of oil-immersed coal dust is at the highest value, and the explosion risk is weakened.

With the increase of particle size, the maximum explosion pressure and maximum pressure rise rate of oil immersed coal dust under a certain dust concentration show a slow downward trend as a whole. The smaller the particle size is, the greater the maximum explosion pressure and maximum pressure rise rate are. With the increase of oil immersion concentration, the variation trend of maximum explosion pressure and maximum pressure rise rate of oil immersed coal dust is different. The influence of 6% oil-immersed concentration on P_max and (dP/dt)_m of coal dust is greater than that of other oil immersion concentrations.

The oil-immersed concentration has a significant impact on the thermal effect of coal dust and the micro morphology of explosive solid products, which is mainly reflected in: the change of total combustion heat of oil-immersed coal dust is affected by particle size and oil-immersed concentration. With the increase of oil-immersed concentration, as for 50 μm and 98 μm, the total heat of oil-immersed coal dust shows a “W” type change trend, The total heat of oil-immersed coal dust of 75 μm decreases first, then increases and then decreases. When the oil-immersed concentration is 6%, the total combustion heat of oil-immersed coal dust with different particle sizes is the largest, which explains the influence of oil-immersed concentration on the maximum explosion pressure of coal dust to a certain extent. The spherical particles of coal dust explosion solid products with oil-immersion concentration of 6% are equal in size and evenly distributed, and the quantity is more than that under other oil-immersed concentrations. During the explosion of raw coal and oil-immersed coal dust, the changes of aromatic functional groups are mainly reflected in the benzene ring, which is replaced by hydrogen atoms; The change of oxygen-containing functional groups is mainly due to the ether structure participating in the explosion reaction; OH-N and free hydroxyl groups in hydroxyl functional groups are mainly involved in the reaction; The type of fat structure involved in the reaction is basically unchanged.

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