不同粒径镁铝合金粉尘爆炸与抑爆特性研究

为了研究镁铝合金粉爆炸危险特性，利用20L球形爆炸容器进行测试，结果表明:180目 (80 μm)、 120目(125 μm) 和60目(250 μm)3种粒径下的金属粉尘爆炸下限浓度分别为45 g/m3，55 g/m3和95 g/m3。相同浓度下最大爆炸压力随粒径增大的而减小。以碳化硅和石墨为代表的研究中，60目，120目和180目的镁铝合金粉以10%的浓度梯度加入碳化硅浓度分别至50%，70%和80%，石墨浓度至30%，50%和60%时，镁铝合金粉不会发生爆炸。表明碳化硅及石墨等惰性粉尘都能对粉尘爆炸有抑制作用，其中石墨对镁铝合金粉的抑爆作用明显优于碳化硅。

Study on characteristics of explosion and explosion suppression for Magnesium-Aluminum alloy dust with different particle size

To study the explosion hazard characteristics of Magnesium-Aluminum alloy dust, a 20L spherical explosion experimental apparatus was used to carry out the tests. The results showed that the lower explosive limit concentration of metal dust with three particle size of 180 mesh (80μm), 120 mesh (125μm) and 60 mesh (250μm) was 45g/m3, 55g/m3 and 95g/m3 respectively, and the maximum explosive pressure decreased with the increase of particle size under the same concentration. In the research with the silicon carbide and graphite as the representative, by adding the silicon carbide and graphite with a concentration gradient of 10% into the Magnesium-Aluminum alloy dust with the particle size of 180 mesh, 120 mesh and 60 mesh, when the concentration of silicon carbide was 50%, 70% and 80% respectively, and the concentration of graphite was 30%, 50% and 60% respectively, the explosion of Magnesium-Aluminum alloy dust did not occur. It showed that the inert dust such as silicon carbide and graphite have the inhibiting effect on the dust explosion, and the explosion suppression effect of graphite on Magnesium-Aluminum alloy dust is better than that of silicon carbide.