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Explanation of several principles of high efficiency air filters
Explanation of several principles of high efficiency air filtersI. When filtering, the fibers and particles of the equipment may have an electric charge, thus producing an electrostatic effect, and the effect of electrostatic filtering materials will be significantly improved, electrostatic can make the dust in the media stick more firmly.II, long-term electrostatic material can also be called "electret" material, this material with static electricity after the resistance remains unchanged, but the effect of filtration will be significantly improved, and electrostatic in the filtering effect does not play a decisive role, but auxiliary role. III. The dust particles in the air will do inertial motion or irregular Brownian motion with the airflow, and when the particles hit other objects, the van der Waals force between the particles will make them stick to the surface of the fibers. The dust entering the filter media will have more opportunities to hit the media, and the smaller dust will collide with each other to form larger particles, which will then settle to the surface of the media. IV, particle dust in the airflow for inertial movement, when encountering the arrangement of disordered fibers when the airflow will change direction, hit the fibers, and be bonded. V. The smaller the particles, the more violent the irregular movement, the more chances of hitting the obstacle, and the better the filtration effect. VI. The activated carbon material in the equipment has a large number of micro-pores that cannot be seen by the naked eye, and they have a large adsorption area, with more than ten square meters of micro-pore area in a grain of activated carbon. VII. When the free molecules in the air come into contact with the activated carbon, they will coalesce into liquid in the micropores, some of which are integrated with the material, and the adsorption without any obvious chemical reaction we call physical adsorption. VIII. We call it chemisorption when the adsorbed particles react with the material to produce solid substances or harmless gases. IX, activated carbon materials in the process of use, the adsorption capacity will continue to weaken, when weakened to a certain extent when the filter will be scrapped, then we can use heating or water vapor fuming to make harmful gases out of the activated carbon so that the activated carbon materials regeneration. |
