摘要：利用粉尘云最低着火温度测试仪研究不同粒径尺寸条件下石松子粉和面粉2种典型可燃性粉尘的粉尘云最低着火温度。结果表明:2种粉尘的粉尘云最低着火温度随粉尘粒径增大逐渐升高;粒径尺寸较小的局部范围内存在拐点, 分析认为该现象由较小尺寸粒径之间的静电吸附作用导致。

关键词：可燃性粉尘；粉尘爆炸；粒径；最低着火温度

Abstract：The minimum ignition temperature of dust cloud of two typical combustible dusts, the lycopodium powder and the flour, in condition of different particle size, were studied through the experiment using device for testing the minimum ignition temperature of dust cloud. The results show that the minimum ignition temperature of dust cloud of the two dusts increases with the increase of the particles size, but there is a turning point on the local scale where particle size is small, which is analyzed to conclude that the phenomenon is caused by the electrostatic adsorption of the small particles.

Keywords: combustible dust；dust explosion；particle size；minimum ignition temperature