The difference between gas explosion protection and dust explosion protection

Explosion-proof motor is a kind of motor that can be used in flammable and explosive places, and does not produce electrical sparks during operation.
According to the explosion-proof principle, the motor can be divided into flameproof motor, increased safety motor, positive pressure motor, non-spark motor and dust explosion-proof motor. From the explosion-proof principle of the explosion-proof electrical equipment, it can be seen that the vast majority of gas explosion-proof electrical equipment shell protection level is lower than dust explosion-proof electrical equipment, if the gas explosion-proof electrical equipment is used in dust explosion dangerous places, dust will enter the equipment and accumulate, which will prevent the safe operation of explosion-proof electrical equipment, resulting in safety risks.
Of course, the shell protection level of gas explosion-proof electrical equipment can also be improved for dust explosion dangerous places, but this is a large investment, extremely economic, because the flameproof, increased safety and other functions for gas explosion-proof are wasted. Conversely, can dust explosion-proof electrical equipment be used in gas explosion hazardous places? The answer is no. Because the dust explosion-proof electrical equipment is only a higher protection level of the shell, it can not prevent explosive gases from entering the shell, and there is no explosion-proof measures such as flameproof and increased safety, so these two explosion-proof electrical equipment must not be changed.

The difference between gas explosion protection and dust explosion protection：
1.Environmental characteristics
Gas explosion protection: relates to the presence of combustible gas or steam, need to consider the concentration of gas, oxygen concentration and may produce sparks and other factors.
Dust explosion-proof: For the combustible dust environment, it is necessary to pay attention to the concentration of dust, particle size, flammable nature of dust and possible dust accumulation and other factors.
2.Explosion mechanism
Gas explosion: Gas explosion is mainly based on the mixture of gas and oxygen to form explosive conditions within the range of combustible gas. Dust explosion: Dust explosion is due to the dust suspended in the air within a certain concentration range, forming a combustible dust cloud, and then under the action of the ignition source explosion.
3.Control strategy
Gas explosion protection: Controlling gas explosion protection mainly involves limiting gas concentration and oxygen concentration, while avoiding situations such as electric sparks that may ignite the gas.
Dust explosion-proof: Controlling dust explosion-proof requires reducing or avoiding the accumulation of dust, avoiding the formation of dust clouds, and preventing dust from encountering ignition sources.
4, gas explosion-proof and dust explosion-proof standards difference
“Explosive gas environment” according to the electrical explosion-proof national standard GB3836, gas explosion-proof methods should be selected.

“Explosive dust environment” according to the electrical explosion-proof national standard GB12476, the selection method for flammable and explosive dust is mainly protection.

5.Differences in protection levels
The protection level of most gas explosion-proof distribution boxes is lower than that of dust explosion-proof distribution boxes

According to the explosion-proof principle of each explosion-proof distribution box, the shell protection level of most gas explosion-proof distribution boxes is lower than that of dust explosion-proof distribution boxes. If the gas explosion-proof distribution box is used in the risk place of dust explosion, dust will enter the equipment and accumulate, obstructing the safe operation of the explosion-proof distribution box, and posing a safety hazard. Of course, the protection level of the gas explosion-proof distribution box shell can also travel, and it can be used in the risk places of dust blasting, but the cost of doing so is high and extremely economical, due to the waste of the explosion-proof and flameproof properties of gas blasting and safety enhancement.

Dust explosion-proof distribution box can not be used in gas explosion risk sites

Because the dustproof and explosion-proof distribution box only needs a higher protection level of the shell, it can not prevent the explosive gas from entering its shell, and has the explosion-proof function and the addition of safety and other explosion-proof methods, so the two explosion-proof distribution boxes must not be switched.

The use of the two planning is also very different, should not be mixed to buy gas or dust explosion-proof distribution box, first of all to identify which use of the environment.