陕西煤炭

以枣泉煤矿2号煤层为工程背景，通过大型煤自然发火实验平台模拟了该煤层从常温到170℃的自然氧化全过程，通过分析得到了煤自燃最小浮煤厚度、最小需氧浓度和最大漏风强度等煤自燃极限参数。实验结果表明，该煤层的实验最短自然发火期是36天，通过计算分析得到了该煤层的最小浮煤厚度、最小需氧浓度以及最大漏风强度的变化趋势。在不同漏风强度的基础上，浮煤厚度在60℃时出现最大值，最小浮煤厚度为0.35 m;最小需氧浓度在50℃时出现最大值，上限漏风强度在30～110℃时为负值。结合现场实际开采条件，提出了预防2号煤层自燃的临界参数，为该矿煤自燃防治提供了重要的理论依据。

Taking 2~# coal seam of Zaoquan Coal Mine as engineering background, the whole process of natural oxidation of this seam from room temperature to 170 ℃ was simulated by a large-scale coal natural ignition experimental platform, and the critical parameters of coal spontaneous combustion such as minimum floating coal thickness, minimum oxygen demand concentration and maximum air leakage intensity were obtained by analyzing the parameters of coal spontaneous combustion.The results of the experiments showed that the experimental shortest natural ignition period of the coal seam was 36 days, and the thickness limit of floating coal, the minimum required concentration of oxygen and the maximum required strength of air leakage were obtained through calculation and analysis.On the basis of different air leakage intensity, the maximum value of floating coal thickness occurs at 60 ℃,and the minimum floating coal thickness is 0.35 m; the maximum value of minimum oxygen demand concentration occurs at 50 ℃,and the upper limit air leakage intensity is negative at 30～110 ℃.Combined with the actual mining conditions at the site, the critical parameters for preventing spontaneous combustion in the 2~# coal seam are proposed, which provides an important theoretical basis to prevent and control the natural combustion of coal mines.