The dust bag is a dry dust removal device that is suitable for capturing fine, dry non-fibrous dust. The filter bag is made of textile filter cloth or non-woven felt. It uses the filtering action of the fiber fabric to filter the dust-laden gas. When the dust-laden gas enters the bag filter, the dust with large particles and large specific gravity settles due to gravity. When it falls down into the ash bucket, gas containing finer dust passes through the filter media, the dust is retained, and the gas will be purified.
The dust-exhaust efficiency of a new filter is generally not high enough. After the filter material is used for a period of time, due to the effects of screening, collision, retention, diffusion, and static electricity, the surface of the filter bag is covered with a layer of dust. This layer of dust is called the primary layer. During this process, the initial layer becomes The main filter layer of the filter, relying on the role of the initial layer, the filter material with larger mesh can also obtain higher filtration efficiency. With the accumulation of dust on the surface of the filter material, the efficiency and resistance of the dust collector are correspondingly increased. When the pressure difference between the two sides of the filter material is large, some fine dust particles that have adhered to the filter material will be squeezed. Reduce the efficiency of the dust collector. In addition, the high dust resistance of the dust remover 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 dust promptly. The primary layer cannot be destroyed during cleaning so as not to reduce the efficiency.
The bag filter structure mainly consists of an upper box, a middle box, a lower box (ash bucket), a dust removal system and a ash discharging mechanism. In addition to the correct choice of filter bag material, the dust removal system plays a decisive role in the bag filter. For this reason, the method of dust removal is one of the characteristics to distinguish the bag filter, and it is also an important part of the operation of the bag filter.