Dust removal filter bags serve as the core component of bag-type dust collectors, operating through the synergy of multiple physical effects to achieve efficient interception and separation of dust particles. When dusty gas enters the dust removal equipment, particles are captured by the filter material through the following mechanisms:
First is the interception effect. When dust particles are larger than the gaps between filter fibers or materials, they are physically blocked on the surface of the filter bag. For new filter bags, this effect is relatively weak, but as dust accumulates on the surface to form a dust layer, interception becomes a primary filtration mechanism.
Next is the impingement effect. Larger dust particles (typically over 1 micron in diameter) deviate from the gas flow streamline due to inertia and collide directly with the filter bag fibers, leading to capture. This effect is closely related to gas velocity—higher velocities increase particle inertia and impingement efficiency but must be balanced to avoid filter bag damage.
For tiny particles (smaller than 0.2 microns), the diffusion effect dominates. These particles undergo irregular Brownian motion due to collisions with gas molecules, increasing their chances of contacting and adhering to filter fibers. Diffusion becomes more pronounced as particle size decreases and gas velocity slows.
Additionally, gravitational settling and electrostatic effects play roles. Large, high-density particles settle under gravity, while electrostatic interactions between the filter bag and dust affect adsorption—opposite charges enhance adsorption but complicate cleaning, whereas like charges do the reverse.
The combined action of these mechanisms enables dust removal filter bags to achieve high efficiency under various conditions. Factors such as fiber diameter, porosity, and dust layer formation directly impact filtration efficiency and energy consumption, necessitating careful design and selection based on specific operational requirements.
Post time: Mar-27-2025