球形密闭容器中煤粉爆炸特性参数研究

Research on characteristic parameters of coal dust explosion in a spherical sealed container

为了探明煤粉在密闭空间中的爆炸特性参数,研究了2种煤粉在20L球形密闭容器中的爆炸机理和规律,探讨了不同点火具质量对煤粉爆炸的影响,并对煤粉进行了抑爆研究.结果表明:煤粉爆炸压力随着点火具质量的增加而增加;在点火具质量相同的条件下,2种煤粉的爆炸压力均随着浓度的增加呈现先上升后下降的趋势,高挥发份含量的煤粉最大爆炸压力较低挥发份的大.煤粉-9%甲烷空气混合物比煤粉-空气混合物的爆炸猛烈程度更强,添加SiO2和NH4H2PO4能够降低煤粉的爆炸压力,相对SiO2的物理抑爆而言,NH4H2PO4的物理-化学混合抑爆效果更佳.

In order to investigate the explosion parameters of coal dust in the spherical sealed container, the explosion rule and explosion mechanism of two kinds of coal dust with different volatile, ignition quality and explosion suppression agent were studied in a 20 L sphere explo- sion test units. The results show that the explosion pressure increased with the increasing of ignition energy. Under the same ignition quality, the explosion pressure firstly increased and then decreased. The explosion pressure of high volatile coal dust is bigger than that of low vol- atile coal dust. The explosion severity of coal dust with 9% methane-air mixtures is stronger than that with air mixture. Adding inert material SiO2 and NH4H2PO4 can effectively reduce coal dust explosion pressure. The explosion suppression results adding NH4H2PO4 is better than that adding SiO2.