20 L球形罐中镁铝混合粉末爆炸特性研究

利用20 L 球形爆炸装置对镁铝粉末进行了一系列的实验测试，分别研究了粉尘浓度、点火延迟、点火能量以及组分比例对镁铝混合粉末爆炸特性影响。结果表明：约为7 μm 的1 ∶ 1镁铝混合粉在不同浓度时的最大爆炸压力和爆炸指数呈先增加后减小的变化规律，相较于铝粉，镁铝混合粉爆炸参数和爆炸危险等级更高，爆炸参数的极大值对应的粉尘浓度低于铝粉；点火延时对镁铝混合粉的爆炸参数影响较大，其比铝粉（60 ms）存在一个更低的点火延迟时间（40 ms）使爆炸参数达到极大值；在其他条件控制不变的条件下，点火能量降低、铝粉含量增加，镁铝混合粉爆炸风险和威力将呈线性降低。

Study on magnesium-aluminum mixed dust explosion characteristics in 20 L sphere device

A series of experimental studies on aluminum-magnesium mixed powder were carried out using a 20 L spherical explosive device. The effects of dust concentration, ignition delay, ignition energy and component ratio of magnesium- aluminum mixed powder on the explosion characteristics were studied. Results showed that: the maximum explosion pressure and explosion index of 1:1 Mg/Al mixed powder (about 7 μm) first increase and then decrease at different concentrations. Compared with aluminum powder, the explosion parameters and explosion risk level of magnesium- aluminum mixed powder were higher. There is a lower dust concentration corresponding to the maximum value of explosion parameters for mixed powder than that of aluminum powder. The ignition delay has a greater influence on the explosion parameters of magnesium aluminum mixed powder, and there is shorter ignition delay time (40 ms) than aluminum powder (60 ms) to make the explosion parameters reach the maximum value.When other conditions remain unchanged, if the ignition energy decreases and the aluminum powder content increases regularly the explosion risk and power of magnesium- aluminum mixture powder decreases linearly.