泄爆导管对容器内粉尘燃爆泄放特性的影响

Effects of Vent Duct on Explosion Venting Characteristics of Dust in the Vessel

为了研究泄爆导管的安装对容器内铝粉燃爆泄放过程的影响,对原有1.3 L Hartman粉尘泄爆装置进行了改进,加装了泄爆导管。实验发现,最大泄爆超压随着泄爆膜动作压力的增大而上升,而最大升压速率的变化规律则与之相反;泄爆导管越粗,容器内的最大泄爆超压越低;相比无泄爆导管的情况,安装泄爆导管后的最大泄爆超压和最大升压速率会在更高的浓度下达到最大值;最大升压速率随粒度的减小而增大;同条件下安装泄爆导管后的超压值要大于未装泄爆导管时的值。为此,加装泄爆导管之后应适当增大泄爆容器的耐压强度。

Experimental studies on the explosion venting of aluminum dust were conducted in 1.3 L Hartmann tube connected to a vent duct. The experimental results show that the maximum reduced pressure increases with relieving pressure increasing. In the contrast,the maximum rate of pressure rise decreases with relieving pressure increasing. Vent duct being wider, the maximum reduced pressure is lower. There exists an optimum concentration making the maximum reduced pressure and the maximum rate of pressure rise reach to a maximum. The concentration is higher than that of no duct venting. The effect of dust particle size on the maximum reduced pressure can be ignored, while the maximum rate of pressure rise increases with particle size decreasing. The higher pressure is measured in the condition of tube connected to a duct.