Dust explosion mechanism and characteristics

The explosion of dust occurs in an instant, accompanied by high temperatures and high pressures. The shock wave formed by the expansion of hot air has great destructive power and destructiveness. The casualties in this area, and the consequent huge economic losses, have caused people to attach great importance to the dust explosion problem.

Dust explosion is similar to gas explosion. It is also a kind of chain reaction. The dust is released by the local chemical reaction under the action of fire source or other induced conditions. It quickly induces a large area of ​​dust to react and release energy. This energy makes the air Increase the temperature, expand rapidly, and form a shock wave with great destructive power.

Compared with gas explosion, dust explosion has three characteristics:

1) The initial energy of dust explosion is almost 100 times that of gas.

2) The dust combustion process is more complicated than the gas combustion process, and the induction period is long. Some dusts pass through the decomposition or evaporation stage of the particle surface. Even if it is directly oxidized, such particles have a process of burning from the surface to the center. The induction time can reach several tens of seconds, which is several times that of gas.

3) A sufficient amount of dust must be flying in the air to cause a dust explosion. The flying of dust particles is related to the size of the particles and the velocity of the gas.

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