Explosion-proof dust collector manufacturers tell you why dust explodes

Explosion-proof dust collector: Why does dust explode?

Explosion-proof dust collector: The mechanism of dust explosion is that the combustion of combustible dust in the air will release energy, and a large amount of gas will be produced underground. The rate at which energy is released, known as the burning rate, is related to the area of ​​the powder exposed to the air. Therefore, for powders of the same solid substance, the smaller the particle size, the larger the specific surface area, and the faster the combustion and diffusion. If the particle size of this solid is very fine. So much so that it can levitate, and once ignited by a fire source, it can release a large amount of energy in a very short period of time. This energy has no time to escape to the surrounding environment, causing the gas in the space to be heated and expand adiabatically. On the other hand, when powder is burned, a large amount of gas is produced, which causes local high pressure in the system, causing the explosion to spread, which is commonly known as dust explosion.

Explosion-proof dust collector: First, the dust should be combustible. Combustible dust includes metal powder, carbon-containing dust, grain dust, etc.

The dust concentration reaches explosion limits. Generally speaking, the lower limit concentration of dust explosion is 20 ~ 60g/m3, and the upper limit is 2 ~ 6kg/m3.

There is a source of ignition or ignition. For example, polishing or welding sparks, electrostatic collision sparks, etc.

We need oxygen. Without oxygen, it cannot burn or explode;

The space is relatively narrow or enclosed. The small space prevents the heat generated by combustion from dispersing quickly, leading to an explosion;

What are the aspects of explosion-proof construction or renovation?

Explosion-proof dust collector: Reinforce the entire dust box. We will have a complete set of calculation formulas for the thickness of the steel plate and the pressure it can withstand. Some customers' dust removal equipment is insured, so we will have a complete plan for the insurance company.

The air inlet is equipped with a one-way valve or explosion-proof valve, which will not affect other pipelines in the event of an explosion.

Explosion-proof dust collector: Install an explosion-proof door or hole on the dust collector box (dirty air chamber). The thickness of the rupture disc and the pressure it will withstand also need to be calculated. The function of the bursting disc is to release the energy of the explosion to a controllable and unaffected place when an explosion occurs.

Explosion-proof dust collector: The filter material and dust box should be flame retardant, antistatic and conductive. The filter material is antistatic to avoid static electricity accumulation and sparks. At the same time, the filter material - frame - flower board - box - box bracket - ground should be connected to conduct electricity. We have a set of standards to measure whether filter materials are grounded.

Conduct professional analysis on each part of the dust collector and control each part in place.