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What is the filtration principle of F9 medium efficiency bag air filter?

2022-07-28 Page view : 100 views

Medium efficiency bag filter belongs to F series filter in air filter. F series medium efficiency air filter is divided into two kinds of bag type and non-bag type, including F5, F6, F7, F8, F9 in bag type and FB (plate type medium efficiency filter), FS (partition type medium efficiency filter), FV (combined medium efficiency filter) in non-bag type.

Material selection.

The outer frame of SFFILTECH medium efficiency bag air filter is high quality galvanized steel or aluminum profile, custom specifications can be made according to customer’s requirements by choosing materials, and the filter material is made of extremely delicate glass fiber.

Filtration principle:


When the particles hit other objects, the van der Waals force (the force between molecules and molecules, molecular groups and molecular groups) between the objects makes the particles stick to the fiber surface. The dust that enters the filter media of the 6 Best medium efficiency bag air filter has more chances to hit the media, and will be stuck when it hits the media. Smaller dust colliding with each other will be bonded to each other to form larger particles and settle, and the concentration of dust particles in the air is relatively stable. The fading of interior and walls is because of this reason.It is wrong to treat the fiber filter like a sieve.

2. Inertia and diffusion

Particle dust in the airflow for inertial motion, when encountered with the arrangement of disordered fibers, the airflow change direction, particles due to inertia deviated from the direction, hit the fiber and be bonded. The larger the particle the easier it is to hit, the better the effect. Small particles of dust for irregular Brownian motion. The smaller the particle, the more violent the irregular motion, the more chance to hit the obstacle, and the better the filtration effect will be. Air particles less than 0.1 micron mainly for Brownian motion, small particles, good filtration effect. Particles larger than 0.3 microns mainly for inertial motion, the larger the particles, the higher the efficiency. Diffusion and inertia are not obvious to the particles are the most difficult to filter out. When measuring the performance of medium efficiency bag air filter, people often specify the measurement of the most difficult to measure the dust efficiency value.

3. Electrostatic effect

For some reason, fibers and particles may be charged with electrostatic effects. With electrostatic medium efficiency bag air filter filter material, the filtration effect can be significantly improved. The reason: static electricity makes the dust change the trajectory and hit the obstacle, static electricity makes the dust stick more firmly on the media. Materials that can carry static electricity for a long time are also called “electret” materials. When the material is electrostatically charged, the resistance remains the same and the filtration effect is significantly improved. Static electricity does not play a decisive role in the filtration effect, but only plays an auxiliary role.

4. Chemical filtration

Chemical filter mainly has selective adsorption of harmful gas molecules. Activated carbon material has a large number of invisible micropores and a large adsorption area. In the activated carbon of the size of a grain of rice, the area inside the micropore is more than ten square meters.After contacting the activated carbon, the free molecules coalesce into liquid in the micropores due to the capillary principle and stay in the micropores, some of which are integrated with the material. SFFILTECH reminds you that in the process of using activated carbon, the adsorption capacity of the material is constantly weakened, and when it is weakened to a certain extent, the filter will be scrapped. If the adsorption is only physical, heating or water vapor fuming can make the harmful gas out of the activated carbon, so that the activated carbon regeneration.