摘要：为了评价镁铝合金粉的燃烧爆炸特性,利用哈特曼管研究粉尘浓度、粒径和惰化剂碳酸钙粒度对镁铝合金粉最小点火能的影响,采用平均粒径分别为15、38、75、120μm的镁铝合金粉及平均粒径为5、21、38μm的碳酸钙粉进行实验研究。结果表明:对于同一粒径的镁铝合金粉,随着质量浓度从100 g/m³增大至1 800 g/m³,其最小点火能先减小后增大;随着镁铝合金粉粒径的增大,最小点火能也会随之增大;碳酸钙对镁铝合金粉的最小点火能有着较大的影响,碳酸钙粒度越小,惰化效果越明显。

关键词：镁铝合金粉；最小点火能；粒度；粉尘浓度

Abstract： To evaluate the combustion and explosion characteristics of Mg-Al alloy powders， a Hartmann apparatus was used to study the effect of dust concentration， particle size and the particle size of inerting agent calcium carbonate on minimum ignition energy （MIE） of Mg-Al alloy powders. The mean size of Mg-Al alloy particles used in the experiments were 15， 38， 75 and 120 μm respectively and the mean size of calcium carbonate particles were 5， 21 and 38 μm. The results show that， for the same size of the alloy powders， the value of MIE first decreases and then increases as the concentration from 100 g/m³ up to 1 800 g/m³. The value of MIE increases with the increase of particle size of alloy powders. Calcium carbonate has a great effect on MIE of powders. When the particle size of calcium carbonate becomes smaller， the inerting effect is more obviously. 

Keywords: Mg -Al alloy powder； minimum ignition energy； particle size； dust concentration