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Air Purifier - Air filter

2018-05-10 22:24:16

Industrial development, pollution, air quality is getting worse, how to ensure the air quality of the family has become an important topic, Xiaobian home just have an air purifier, before in order to find a useful air purifier, Xiaobian studied a lot of air filtration knowledge, today to introduce to you, hope to help you

Tools/Materials
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Air purifier

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Air filtration technology

Technical analysis of air filtration
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This page is an illegal climb taken from experience

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HEPA filters particles with a diameter of 0.3 micron (PM0.3) and above with an efficiency of more than 99.97%, and is a filter medium for pollutants such as smoke, dust particles and bacteria. The development of HEPA is relatively mature, and it is an internationally recognized filtration material, so it is widely used by mainstream brands of air purifiers. However, HEPA is powerless against harmful chemical gases, and it also needs to be replaced and maintained regularly during use. 【 Illustration shows Blueair HEPA filter 】

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Compared with the poor filtering effect of HEPA technology filter on benzene, formaldehyde and other harmful chemical gases, most brands of air purifiers also use a filter based on activated carbon technology, activated carbon filter usually adopts a lattice structure, the grid is equipped with activated carbon particles, special structure and activated carbon characteristics, The filter screen has the advantages of small wind resistance coefficient, large specific surface area and strong adsorption capacity.

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Activated carbon is made from coal, wood and fruit shells and other raw materials through carbonization, activation and post-treatment. Due to the large surface area of carbon particles, they can fully contact and adsorb harmful chemical gases. However, activated carbon can only temporarily absorb a certain amount of pollutants, when the temperature, wind speed, etc., rises to a certain extent, the pollutants it adsorbs may be free to cause secondary pollution.

Matters needing attention

I hope it will be helpful to friends who need air purifiers. Thank you

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