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Dust removal mechanism of bag filter

The dust removal mechanism of a bag filter is first and foremost the screening effect. When the particle size of the dust is larger than the pores of the filter cloth or the pores between the dust particles deposited on the filter cloth, the dust is intercepted. Due to the fact that the pores of the new filter cloth are much larger than the particle size of the dust, the retention effect is very small. When a large amount of dust is deposited on the surface of the filter cloth, the retention effect significantly increases.

The second is the inertial collision effect. When the dusty airflow approaches the filter fabric fibers, the airflow will bypass the fibers, and the dust particles will continue to move forward in a straight line due to inertia, and will be trapped when they hit the fibers. All large dust particles within the critical line of the dust trajectory can reach the surface of the fibers and be trapped. This inertial collision effect increases with the increase of dust particle size and flow velocity.

Once again, there are electrostatic and diffusion effects. Less than 1 μ When the airflow speed is very low, the removal of dust particles mainly relies on diffusion and electrostatic effects. Less than 1 μ Under the impact of gas molecules, dust particles of m detach from the streamline and undergo Brownian motion like gas molecules. If they come into contact with fibers during the motion, they can be separated from the airflow, which is called diffusion. It increases with the decrease of airflow speed and the diameter of fibers and dust. Generally, both dust and filter cloth may have charges. When the charges carried by the two are opposite, dust is easily adsorbed on the filter cloth; On the contrary, if both have the same charge, the dust will be repelled. Therefore, if there is an external electric field, it can strengthen the electrostatic effect and improve the dust removal efficiency.

The last type of action belongs to the action of gravity. When the slowly moving dusty airflow enters the dust collector, dust particles with high particle size and density may naturally settle due to gravity.

Pub Time : 2023-09-01 11:22:40 >> News list
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