激波卷扬三通管内铝粉致二次爆炸及抑爆研究

The secondary explosion of aluminum dust diffused by shock wave and its suppression in T-branch pipeline

设计粉尘爆炸综合测试平台,研究激波卷扬铝粉致二次爆炸的现象及其抑爆规律。结果显示,中位粒径为35μm的铝粉在质量浓度为500 g/m3时的最大爆炸压力等爆炸特性参数值高于其他浓度。基于工业管道集尘系统特点设计实验室水平三通管抑爆系统进行试验,结果表明:封闭三通管的分岔结构增强了主管道分岔口的爆炸压力和火焰传播速度,同时削弱了垂直分管道的爆炸压力和火焰传播速度;铝粉最大爆炸压力和火焰传播速度随加入抑爆剂浓度的增加而减小,磷酸二氢铵抑爆剂质量分数为10%时可以完全抑制铝粉爆炸。

In order to study the secondary explosion of aluminum dust diffused by shock wave from the primary explosion and its explosion suppression regularity,an integrated dust explosion laboratory pipeline is designed.The results show that the explosion characteristic parameters such as the maximum explosion pressure of the aluminum dust with a median particle size of 35 μm at a mass concentration of 500 g/m3 are higher than that of other concentrations.Based on the characteristics of dust collection system of industrial polishing process,the explosion suppression system of horizontal T-branch pipeline in laboratory is designed.The analysis results show that the bifurcation structure of the closed Tbranch pipeline enhances the explosive pressure and flame propagation velocity at the bifurcation of the main pipe,and weakens the explosive pressure and flame propagation velocity at the vertical bifurcation pipe;The maximum explosion pressure and flame propagation velocity of aluminum dust decrease with the increase of explosion suppressant concentration,and when the content of ammonium dihydrogen phosphate is 10%(mass fraction),the explosion of aluminum dust used in the experiment can be completely suppressed.