铝粉-空气混合物爆炸压力影响因素研究

Study on Factors Influencing the Explosion Pressure of Aluminum Dust-air Mixture

在水平管道式粉尘爆炸装置中,通过大量实验研究了点火延迟时间、铝粉浓度和铝粉粒度对铝粉的最大爆炸压力和压力上升速率的影响。结果表明:对浓度和粒度一定的铝粉,存在—个可爆延迟时间范围,铝粉在该延迟时间范围内点火才能发生爆炸;同时,还存在—个最佳点火延迟时间可以使爆炸压力和压力上升速率同时达到最大值;铝粉的最大爆炸压力和压力上升速率随铝粉浓度的增大先增大后减小,随铝粉粒径的增大而减小。

In the horizontal pipeline dust exploding device, the influence of ignition delay time, aluminum dust concentration and its size on the maximum explosion pressure and rate of pressure rise have been done by lots of experiments. The results show that aluminum dust with a fixed concentration and size has an explosive delay range and it can explode only in the range. And there is a optimum ignition delay time, at which the maximum explosion pressure and rate of pressure rise of aluminum dust can maximize at the same time. The maximum explosion pressure and rate of pressure rise grow firstly and then decrease with the increase of concentration of aluminum dust, and decrease with the augmentation of the particle size.