Do you know there is a partition filter?

High-efficiency filters with partitions are divided into high-efficiency filters with paper partitions, high-efficiency filters with aluminum foil partitions, and high-temperature resistant high-efficiency filters with partitions. It is used for terminal filtration of various levels of clean rooms and various local purification equipment, such as clean bench laminar flow hoods and other ambient air purification.

The working principle of the partition filter:

There are high-efficiency filters with partitions to intercept dust particles in the air, and move with the airflow through inertial motion or irregular Brownian motion or under the action of a certain field force. When the particle motion hits other objects, the van der Waals force between the objects (Molecular-to-molecule, molecular-cluster-to-cluster forces) makes the particles stick to the fiber surface. The dust entering the filter medium has more chances to hit the medium, and it will be stuck when it hits the medium. When smaller dust collides with each other, they will bond with each other to form larger particles and settle, and the particle concentration of dust in the air is relatively stable. The fading of the interior and walls is for this reason. It is a mistake to think of a fiber filter as a sieve.

There are bulkhead filters for inertia and diffusion:

The particle dust makes an inertial motion in the airflow. When encountering the disorderly arranged fibers, the airflow changes direction, and the particles deviate from the direction due to inertia and hit the fibers and are bonded. The larger the particle, the easier it is to hit, and the better the effect. Small particles of dust make random Brownian motion. The smaller the particles, the more violent the random movement, the more chances of hitting obstacles, and the better the filtering effect. Particles smaller than 0.1 microns in the air mainly perform Brownian motion, and the particles are small and the filtering effect is good. Particles larger than 0.3 microns are mainly used for inertial motion, and the larger the particle, the higher the efficiency. Diffusion and inertia are not so obvious that the particles are the most difficult to filter out. When measuring HEPA performance, people often specify the most difficult dust efficiency values to measure.

There is a separator filter electrostatic effect:

For some reason, fibers and particles may be charged, creating an electrostatic effect. The filtration effect of electrostatically charged filter materials can be significantly improved. Reason: Static electricity makes the dust change its trajectory and hit obstacles, and static electricity makes the dust stick more firmly on the medium. Materials that can be electrostatically charged for a long time are also called "electret" materials. After the material is charged with static electricity, the resistance remains unchanged, and the filtering effect will be significantly improved. Static electricity does not play a decisive role in the filtering effect, but only plays an auxiliary role.

Chemical filtration with partition high-efficiency filter:

Chemical filters mainly selectively adsorb harmful gas molecules. There are a large number of invisible micropores in the activated carbon material, which has a large adsorption area. In the rice-grain-sized activated carbon, the inner area of the micropores is more than ten square meters. After the free molecules contact activated carbon, they condense into a liquid in the micropores and stay in the micropores due to the capillary principle, and some are integrated with the material. Adsorption without an obvious chemical reaction is called physical adsorption. Some treat activated carbon, and the adsorbed particles react with the material to generate solid matter or harmless gas, which is called chemical adsorption. During the use of activated carbon, the adsorption capacity of the material is constantly weakened, and when it weakens to a certain extent, the filter will be scrapped. If it is only physical adsorption, heating or steam fumigation can remove harmful gases from activated carbon and regenerate activated carbon.

Gravity effect of high-efficiency filter with partition：

When the particles pass through the fiber layer, under the action of gravity, the displacement from the airflow streamline occurs and settles on the surface of the fiber. This effect exists only when the particles are large (>0.5um), which is when the gravity effect of the particles is too small. It has passed through the fiber layer with the airflow before it settles on the fiber. Therefore, for the filtration of particles with a particle size of less than 0.5um, the gravity sedimentation can be completely ignored.

Wuxi Lenge Purification Equipments Co., Ltd. is a professional purification equipment manufacturer. Suitable for pharmaceuticals, laboratory, food & beverage, electronics, etc. If you are interested in purification equipment, please get in touch with us! You can call 86-510-85189266. Or send an email to export@wxljjh.com.