What are the characteristics of dust explosion?

Dust explosion has the following characteristics:

(1) Multiple explosions are the biggest characteristics of dust explosion;

(2) The minimum ignition energy required for dust explosion is relatively high, generally above tens of millijoules.

(3) Compared with combustible gas explosion, the pressure of dust explosion rises slowly, the duration of higher pressure is long, the released energy is large, and the destructive power is strong.

1, all solid substances in fine powder state are called dust. Dust that can burn and explode is called combustible dust; Dust floating in the air is called suspended dust; Dust falling on the solid wall is called deposited dust.

2. It has been found that the dust of the following seven substances is explosive: metals (such as magnesium powder and aluminum powder); Coal; Cereals (such as wheat and starch); Feed (such as blood meal and fish meal); Agricultural and sideline products (such as cotton and tobacco); Forest products (such as paper powder and wood powder); Synthetic materials (such as plastics and dyes).

3. Dust produced in the production process of some factories and mines, especially in the processing of some organic substances, can cause explosion and combustion accidents under certain conditions. The research results at home and abroad show that there are generally three kinds of situations:

(1) combustible dust is suspended in the air at a proper concentration, forming a dust cloud that people often say;

(2) Sufficient air and oxidant;

(3) There is a fire source or strong vibration and friction. Generally speaking, as long as the explosive dust meets the conditions (1) and (2), it indicates that an accident may occur.