点火能量对煤粉爆炸行为的影响

摘要

为了探明点火能量对煤粉爆炸特性参数的影响,利用20 L球形爆炸装置进行试验测试,试验研究了不同点火能量对煤粉爆炸行为的影响,对煤粉爆炸猛度(最大爆炸压力和最大升压速率)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;惰性介质抑爆效力随点火能量增加而下降,建议采用5～10 kJ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 influence of ignition energy on explosion characteristic parameters of pulverized coal,the experiment was carried out in the 20 L spherical explosive device to study the influence of different ignition energy on the explosion behavior of pulverized coal.The change law was emphatically discussed about the pulverized coal explosion brisance (the maximum explosion pressure and the maximum pressure rise rate) and the explosion suppression effect of inert medium with ignition energy.The results showed that the explosion pressure firstly increased and then decreased as the pulverized coal concentration increasing with the increase of ignition energy.Under the same concentration,the maximum explosion pressure and the maximum pressure rise rate increased linearly,and the influence of ignition energy on dust explosion pressure was more obvious at high concentration.Moreover,the explosion suppression effectiveness of inert medium decreased with the increase of ignition energy.It was suggested that 5 to 10 kJ ignition energy was the most appropriate to investigate the inhibition effect of inert medium on pulverized coal explosion.