At present, with the trend of rapid industrialization in China, the trend of large-scale development, the enterprise production process of dust explosion occurred many times, affecting the enterprise property losses, resulting in enterprise insecurity, enterprises must improve the awareness of safety, in order to be able to reduce the unnecessary loss of enterprises. Dust explosion will have how much harm? How do we prevent it?

First, the main hazards of dust explosion

For production, processing, handling, transit or storage process or may appear explosive dust, combustible conductive dust, combustible non-conductive dust and combustible fibers and air to form explosive dust mixtures environment, that is, explosive dust environment. Dust in an explosive dust environment should be divided into the following four types.

(1) explosive dust: this dust can catch fire even in an environment with little oxygen in the air, is suspended state can produce a violent explosion, such as magnesium, aluminum, aluminum bronze and other dust.

(2) combustible conductive dust: with the oxygen in the air to start the heating reaction and burning conductive dust, such as graphite, carbon black, coke, coal, iron, zinc, titanium and other dust.

(3) combustible non-conductive dust: non-conductive dust that burns with the thermal reaction of oxygen in the air, such as polyethylene, phenol ester, wheat, corn, sugar, dyes, cocoa, wood, rice bran, sulfur and other dusts.

(4) combustible fibers: with the oxygen in the air to start the thermal reaction and combustion of fibers, such as cotton fiber, hemp fiber, silk fiber, wool fiber, wood fiber, synthetic fibers and so on.

Second, the dust explosion is prone to secondary explosion. The first explosion of the air waves deposited in the equipment or dust on the ground blowing up, in the short time after the explosion will form a negative pressure in the center of the explosion, the surrounding fresh air will be filled in from the outside to the inside, the formation of the so-called "return to the wind", and the rise of the dust mixed in the first explosion of the residual fire ignition caused by the second explosion. The second explosion, the dust concentration is generally much higher than the first explosion, so the second explosion is much more powerful than the first. He will affect the electrical, equipment, circuit control system explosion and combustion, can produce different poisonous gases often result in a large number of casualties after the explosion of human and animal poisoning, must be given due attention.

Third, how to prevent dust explosion

(1) is to reduce the concentration of dust in the air. The use of equipment with good airtight performance to minimize dust dispersal escape, while installing effective ventilation and dust removal equipment to strengthen the cleaning work.

(2) is to control the indoor temperature.

(3) is to improve the equipment, control the source of ignition. Dust explosion hazardous places, four, dust-generating enterprises must use the national quality standards explosion-proof electrical, explosion-proof motors, explosion-proof switches, explosion-proof lights, explosion-proof axial fan, etc., intrinsically safe explosion-proof cables are more important, Tianjin Cable Factory, a branch manager of Bi Guohua to remind customers of the use of intrinsically safe explosion-proof cables must be used to protect against the explosion of the IA level. (explosion-proof control cables, explosion-proof signal cables, explosion-proof computer cables, explosion-proof coaxial cables) in the normal operating conditions, explosion-proof cables in the presence of a fault or two faults, can not ignite the explosive gas mixture. In IA type explosion-proof cables, the working current is limited to less than 100mA, which is suitable for use in chemical industry, dust enterprises, and so on.