How does the dust filter in the feed factory filter fine dust?

When the dusty air generated during the feed production process enters the dust filter, the first thing to face is the preliminary screening of the filter material. The filter material is usually made of polyester fiber, glass fiber, etc., and there are many fine pores on its surface. For dust particles with a particle size larger than the pores, the "screening effect" can effectively play a role and intercept these larger particles on the surface of the filter material. However, the dust generated in feed production is extremely complex, and a large amount of fine dust with a particle size smaller than the pores of the filter material cannot be removed by simple screening. At this time, the deep filtration mechanism of the dust filter begins to play a key role.

The inside of the filter material is a complex fiber interwoven network structure. When fine dust particles enter the filter material under the entrainment of the airflow, a variety of physical effects work together to cause the dust to collide with the fiber surface and adhere, thereby achieving efficient filtration.

The inertial effect plays an important role in this process. When the airflow flows between the complex fiber structure inside the filter material, the direction changes frequently. However, fine dust particles have a certain mass. When the airflow turns, they will continue to maintain their original motion trajectory due to their own inertia. This inertia makes it impossible for dust particles to follow the airflow in time, and then hit the fiber surface and be captured. For example, some relatively large fine dust particles are easy to deviate from the airflow direction due to inertia when passing through the curved airflow channel inside the filter material, and finally adhere to the fiber.

The diffusion effect is mainly aimed at dust particles with extremely small particle sizes. Under the influence of the Brownian motion of gas molecules, these fine dust particles will show a random motion state. They randomly shuttle inside the filter material, and the probability of contact with the fiber surface is greatly increased. Over time, these dust particles continue to collide with the fiber and are eventually adsorbed by the fiber surface. This diffusion effect is particularly effective when dealing with dust particles with a particle size of submicron level, greatly improving the filtration efficiency of ultra-fine dust.

The electrostatic adsorption effect further enhances the feed mill dust removal filter's ability to filter fine dust. Some filter materials are specially treated during the production process to make their surfaces carry static electricity. When the charged fine dust particles approach the fiber surface, they will be affected by the electrostatic attraction and quickly adsorbed to the fiber. Electrostatic adsorption can not only capture those fine dusts that are difficult to remove by inertia and diffusion effects, but also has a strong adsorption force on dust and is not easy to fall off, thus ensuring the stable filtering performance of the filter during long-term operation.

As the filtering process continues, a large amount of dust will gradually accumulate on the surface and inside of the filter material. This will not only increase the resistance of the filter, affect the ventilation volume, but also may reduce the filtering efficiency. In order to ensure that the dust removal filter can work continuously and stably, modern feed factory dust removal filters are generally equipped with a cleaning system. The common cleaning method is pulse jet cleaning. When the resistance of the filter reaches the preset value, the pulse jet device will instantly release high-pressure gas. These high-pressure gases blow the filter bag in the opposite direction at a very high speed, causing the filter bag to expand and contract instantly. Under this strong impact and vibration, the dust attached to the surface of the filter bag falls off and falls into the dust hopper. In this way, the filtering performance of the filter material is restored, ensuring that the dust removal filter can continue to operate efficiently.

The feed factory dust filter effectively filters fine dust with a particle size smaller than the pores of the filter material through multiple effects such as inertia, diffusion and electrostatic adsorption in the deep filtration mechanism. This process cooperates with the sieving effect and the cleaning system to form a complete and efficient dust treatment system. It not only ensures the cleanliness of the internal production environment of the feed factory, reduces safety risks such as dust explosions, but also ensures that the quality of feed products is not polluted by dust, playing an irreplaceable and important role in the production of the feed industry. A deep understanding of the filtering principle of fine dust by the feed factory dust filter will help to better select, use and maintain this key equipment, and provide a solid guarantee for the safety and efficiency of feed production.