密闭空间煤粉爆炸特性的实验研究

Experimental Studies on Explosion Characteristics of Coal Dust in Confined Space

为了探明煤粉在密闭空间中的爆炸特性参数,利用20 L球形爆炸装置进行实验测试,实验研究了不同点火能量对煤粉爆炸行为的影响,对比CaCO_3和Al(OH)_3两种惰性介质的抑爆效果及惰性介质的抑爆效力随点火能量的变化规律进行了重点探讨。结果表明:随着点火能量的增加,爆炸压力随着煤粉浓度的增加呈现先上升后下降的趋势,在同一浓度下,粉尘最大爆炸压力和最大升压速率呈线性上升,在高浓度下,粉尘爆炸压力受点火能量的影响更显著;添加CaCO_3和Al(OH)_3能够降低煤粉的爆炸压力,相对于CaCO_3的物理抑爆而言,Al(OH)_3的物理-化学抑爆效果更佳;惰性介质抑爆效力随点火能量增加而下降,建议采用5~10 k J点火能量考察惰性介质对煤粉爆炸的抑制效力。

In order to investigate the explosion parameters of coal dust in the spherical sealed container, the systematic experiments were carried out in the Siwek 20L sphere. The effect of different ignition energies on explosion behavior of coal dust was investigated. The inhibition effectiveness of CaCO3 and A1 （OH） 3 was compared, and the variation of explosion suppression effectiveness of inert substance along with the ignition energy were explored. The results showed that explosion pressure increased with the ignition energy increasing, and the explosion pressure increased firstly and then decreased with increasing of coal dust concentration. Under the same concentration, maximum explosion pressure and maximum pressure rising rate linearly increased with ignition energy, and the influence of ignition energy on explosion pressure of coal dust with high concentration was more obvious. The addition of inert Ca- CO3 and AI（OH） 3 effectively decreased coal dust explosion pressure. The explosion suppression result of AI（OH） 3 was higher than CaCO3. Moreover, explosion suppression effectiveness of the inert substance decreased with rising of ignition energy. The ignition energy of 5 - 10 kJ was the most appropriate for studying the explosion suppression effectiveness of inert substance.