Dedusting filter bag working principle

- Sep 08, 2020-

Dedusting filter bag working principle

The bag filter is a dry dust removal device, which is suitable for collecting fine, dry and non-fibrous dust. Filter bag used textile filter cloth or non textile mat is made, using the fabric filter effect of dust filters, gas when dusty gas into the bag dust catcher, large particles, major dust, due to the effect of gravity settling down, fall into the hopper, contains the fine dust of gas through the filter material, the dust were blocked, the purified gas.

The dust removal efficiency of general new filter material is not high enough. Filter material to use after a period of time, due to the screen, collision, stranding, diffusion, electrostatic effect, such as a layer of dust accumulation on the surface of filter bag, at the beginning of the dust layer is called layer, after the movement process, early become the main filter to filter material layer, depending on the role of the first layer, large mesh filter material can also get higher filtration efficiency. 

With the accumulation of dust 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 very large, some fine dust particles attached to the filter material will be squeezed past, so that the efficiency of the dust collector decreases. 

In addition, the high resistance of the dust collector will significantly reduce the air volume of the dust removal system. Therefore, after the resistance of the dust collector reaches a certain value, it is necessary to clear the ash in time. 

The ash can not destroy the initial layer, so as not to reduce the efficiency. The structure of the bag filter is mainly composed of the upper box, the middle box, the lower box (ash bucket), the ash cleaning system and the flight exhaust mechanism.

 In addition to the correct selection of bag material, the ash cleaning system plays a decisive role in the performance of the bag filter. Therefore, the method of dust cleaning is one of the characteristics of the bag filter and an important part of the operation of the bag filter.