Working Principle of the Dust Bag

The bag type dust collector is a dry dust removal device, which is suitable for collecting fine, dry non-fibrous dust. Common filter bags include cloth dust collector bags, felt filter bags, which are made of woven filter cloth or non-woven felt. The filter property of fiber fabric is used to filter the dust-containing gas. When the dust-containing gas enters the bag type dust collector, the particles Large and heavy dust settle down due to gravity and fall into the ash hopper. When the gas containing finer dust passes through the filter material, the dust is blocked and the gas is purified. Generally, the dust removal efficiency of new filter media is not high enough. After the filter material has been used for a period of time, due to the effects of sieving, collision, retention, diffusion, static electricity, etc., a layer of dust accumulates on the surface of the filter bag. 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. Depending on the function of the primary layer, the filter material with relatively large mesh can also obtain high filtration efficiency.

As dust accumulates on the surface of the filter material, the efficiency and resistance of the dust collector increase accordingly. When the pressure difference between the two sides of the filter material is large, some fine dust particles that have been attached to the filter material will be squeezed. The efficiency of the dust collector is reduced. In addition, excessive 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 must be cleaned in time. The primary layer should not be destroyed when cleaning dust, so as not to reduce efficiency. The structure of the bag type dust collector is mainly composed of upper box body, middle box body, lower box body (ash bucket), ash cleaning system and ash discharge mechanism.

As for the performance of the bag type dust collector, in addition to the correct selection of the filter bag material, the dust removal system plays a decisive role in the bag type dust collector. For this reason, the dust removal method is one of the characteristics to distinguish the bag type dust collector, and it is also an important part of the operation of the bag type dust collector.