煤自燃全过程实验模拟及高温区域动态变化规律的研究

Experiment simulation of whole process on coal self-ignition and study of dynamical change rule in high-temperature zone

结合现场实际,在XK-1型自然发火实验台的基础上,设计建造了装煤量15t的特大型煤自然发火实验台.利用该实验台对南屯矿煤样进行了历时38d的实验,模拟了从常温至450℃以上煤自燃的全过程,掌握了煤自燃高温区域的发生、发展及其动态变化过程.实验结果表明,煤自燃高温区域动态变化的总趋势是向进风侧移动,且随着煤体温度的升高,耗氧速度增大,高温区域向孔隙率大、供氧充分的地点移动,最终移至供风表面,形成明火.

Combined with practical condition, on the basis of XK-1 coal spontaneous combustion experimental apparatus, the oversize experimental apparatus of coaling 15 t was designed and created.The oversize experimental apparatus was applied to simulate the process of Nantun coal spontaneous combustion last for 38 d.The whole process of coal self-ignition was simulated from normal temperature to above 450 ℃, the process was mastered, which high-temperature zone generate, develop and dynamically change.According to experimental results, the dynamical change trend of high-temperature zone can be gained.The trend is that high-temperature zone moves to the side of air supply, along with coal temperature rising and oxygen consumption rate increasing, high-temperature zone moves to the place which porosity is bigger and oxygen supply is sufficient, and high-temperature zone finally moves to the surface of air entry and comes into being bright fire.