为了研究巷道中煤层阴燃状态的判别方法,基于阴燃是氧控制反应的原理,根据通风阻力定律、风量平衡定律和Fick第一扩散定律,分别建立了煤层阴燃稳定传播与趋向熄灭时巷道中的O2体积分数方程,提出了用巷道中的O2体积分数梯度进行煤层阴燃状态的判别方法,即从巷道的自然风流区至热空气涡流区之间随着距自然风流区距离的增大,阴燃趋向熄灭时的O2体积分数梯度绝对值均是定值η,而阴燃稳定传播时的O2体积分数梯度绝对值呈现出大于η,等于η和小于η的下降趋势.借助巷道中煤层阴燃模拟实验装置,对上述判别方法进行了实验验证,实验测定出褐煤的η=90%/m.结果表明,巷道中煤层阴燃状态的O2体积分数梯度判别法是合理的. In order to study the discriminant method of smoldering coal seam in roadway, based on the principle that smoldering is the oxygen control reaction, according to the law of ventilation resistance, the law of air volume balance and Fick’s first law of diffusion, , The paper presents a method to discriminate the smoldering state of the coal seam with the gradient of the volume fraction of O2 in the roadway, that is, the distance from the natural air flow zone to the hot air swirl zone increases with the distance from the natural air flow zone , While the absolute value of the gradient of O2 volume fraction when the smoldering tendency goes out is a fixed value η, while the absolute value of the gradient of O2 volume fraction when the smoldering steady propagation shows a downward trend that is greater than η, equal to η and less than η. Smoldering simulation experiment device, the above discriminating method was verified by experiments, and the η = 90% / m of lignite was determined experimentally.The result shows that it is reasonable to judge the gradient of O2 volume fraction in smoldering coal seam in roadway.