What role in dust removal filter bag

According to the different mechanical properties of the movement of different particle sizes in fluid, the filter dusting mechanism involves the following aspects:

1, screen filter

The filter material of the filter is typically 5 ~ 50 μm, and when the dust particle diameter is larger than the visual gap between the mesh or pore diameter or dust deposits between the filter, the dust is restored. For new fabric filters, since the voids between the fibers are much larger than the dust particle diameter, the sieve filtration is small, but after the surface deposits a large amount of dust, the screen is significantly enhanced.

2, inertial collision

The dust in general particle size is mainly trapped by inertial collision. When the dust flow is close to the fibers of the filter material, the gas stream will bypass the fibers, where large particles (greater than 1 μm) are inertial, deviate from the airflow streamline, continue along the original movement direction, hit the fibers Capture. All dust plants in the critical line of the dust trajectory can be captured by the surface of the fiber. This inertial collision is enhanced as dust particle size and air flow rate increase. Therefore, improve the inertial collision effect by increasing the flow rate of the air filter material.

3, interceptive role

When the dust flow is close to the filter material fibers, the dust particles are flowing with the airflow, and when the dust particle radius is larger than the distance from the dust grain to the edge of the fiber, the dust particles are intercepted by contact with the fibers.

4, diffusion

For dust particles less than 1 μm, in particular less than 0.2 μm sub-micron particles, the flow line is detached under the impact of the gas molecule, as a brown movement like gas molecules, and can be in the airflow if the fibers are in contact with the fibers during exercise separate from. This action is called a diffusion, which is enhanced with the decrease in flow rate, and the fiber and dust diameter are reduced.

5, electrostatic action

Many fiber woven filters, when the airflow passes, due to the friction generates an electrostatic phenomenon, and the dust is charged during the conveying process, which will form a potential difference between the filter material and dust particles. When dust is treated with the airfill, the trapping efficiency is improved due to the role of the Cullan force to collide with dust and filter fibers and enhance the adsorption of dust.