How does a dust filter bag work

Generally, the dust removal efficiency of the new filter material is not high enough. After the filter material is used for a period of time, due to the effects of sieve filtration, collision, retention, diffusion and static electricity, etc., the surface of the filter bag is covered with a layer of dust. This layer of dust is called the primary layer. In the subsequent movement process, the primary layer becomes the main filter layer of the filter material, and depending on the function of the primary layer, the filter material with larger mesh size can also obtain higher filtration efficiency. As the dust accumulates on the surface of the filter material, the efficiency and resistance of the dust collector increase correspondingly. When the pressure difference between the two sides of the filter material is large, some tiny dust particles that have adhered to the filter material are squeezed through, and the efficiency of the dust collector is lowered. In addition, the excessive resistance of the precipitator will significantly reduce the air volume of the dedusting system. Therefore, after the resistance of the precipitator reaches a certain value, it should be cleaned in time. The primary layer should not be destroyed when cleaning, so as to avoid the efficiency dropping.

The structure of the bag filter is mainly composed of an upper box, a middle box, a lower box (ash hopper), a cleaning system and an ash discharging mechanism. The performance of the bag filter is not only the correct choice of the filtration material, but also the deashing system which plays a decisive role in the bag filter. Therefore, the cleaning method is one of the characteristics of the bag filter, and is also an important part of the operation of it.