Bag filter is a dry dust filtering device. It is suitable for capturing small, dry, non fibrous dust. The filter bag is made of textile filter cloth or non-woven felt, and uses the filtering effect of fiber fabric to filter the dust containing gas. When the dust containing gas enters the bag filter, the large and heavy dust particles settle down due to gravity and fall into the ash hopper. When the gas containing finer and smaller dust passes through the filter material, the dust is retained and the gas is purified.
Basic Introduction
Bag filter is a dry dust filtering device. After using the filter material for a period of time, due to screening, collision, retention, diffusion, static electricity and other effects, a layer of dust accumulates on the surface of the filter bag, which is called the initial layer. During the subsequent movement process, the initial layer becomes the main filtering layer of the filter material. With the help of the initial layer, filter materials with larger mesh holes can also achieve higher 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 small dust particles that have already adhered to the filter material will be squeezed out, causing a decrease in the efficiency of the dust collector. In addition, excessive resistance of the dust collector can significantly reduce the airflow of the dust removal system. Therefore, after the resistance of the dust collector reaches a certain value, it is necessary to clean the dust in a timely manner. When cleaning, the initial layer should not be damaged to avoid a decrease in efficiency.
Structural characteristics
Structure diagram of bag filter:

The structure of a bag filter mainly consists of an upper box, a middle box, a lower box (ash hopper), a cleaning system, and an ash discharge mechanism.