1070

Dust explosions are phenomena in which a flame propagates through a dust cloud in air with increasingly subdivided combustible solids. These events are common risks in the coal, metallurgy, chemicals, wood, food processing, explosives and other industries. In order to study the propagation characteristics of coal dust explosion flame, box graph and two-factor variance analysis were used to explore the influence of coal dust metamorphism degree and coal dust particle size on the propagation characteristics of coal dust explosion flame in this paper. Specifically, a certain coal sample was selected and the coal dust explosive identification test was carried out through the modified MCB-III intelligent coal dust explosive identification instrument. By observing box graph, the different influence rules of metamorphism and particle size on the length of coal dust explosion flame were analyzed qualitatively.