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针对目前煤矿由于自燃发火后直接灭火无效的情况下,常采用封闭火区的方法,启封时容易发生自燃,采用交叉点温度法对其进行研究。分别采用不同质量的煤样进行试验,获得最佳煤样质量条件下的交叉点温度,采用不同的氧化温度对煤样进行初次氧化后降温,然后再次氧化考察交叉点温度变化情况。结合红外光谱分析最终得出当煤炭发生自燃之后,自燃点中心的煤样由于煤中活性基团基本反应完全,因此较难再次自燃,但是离中心点较远,受到热量影响的煤,由于煤样物理、化学条件改变,更容易传热及吸附氧气,因此更容易发生自燃。因此煤矿发生火灾而封闭的火区,启封时要特别注意距离煤自燃中心点较远位置的煤样的防护,防止其发生再次复燃。
In the light of the fact that coal mines are not effective immediately after spontaneous combustion, the closed fire area is often used. Spontaneous combustion easily occurs during unsealing, and its application is studied by crossing point temperature method. The coal samples with different qualities were tested respectively to obtain the intersection temperature under the best coal sample quality conditions. The coal samples were first oxidized and then cooled with different oxidation temperatures, and then oxidized again to investigate the temperature changes at the intersections. Combining with FTIR analysis, it is concluded that coal spontaneous combustion in the center of spontaneous combustion point is more difficult to spontaneous combustion because of the basic reaction of the active groups in coal after coal spontaneous combustion. However, since coal is far away from the center and affected by heat, Like physical and chemical conditions change, easier to heat transfer and adsorption of oxygen, so more prone to spontaneous combustion. Therefore, the coal mine fire and closed fire zone, when unsealed, pay special attention to the distance from the coal spontaneous combustion center position of the coal sample protection, to prevent its occurrence again.