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Why should a reasonable wind speed be set during the use of air filter materials?

Time : 2023-06-28 Hits : 2

Air filter materials generally refer to primary effect filter cotton, medium effect filter cotton, high-efficiency filter paper, etc., and the equipment made of these materials is called air filter. Each air filter material has its own characteristics. Let's mainly talk about the setting of wind speed for the primary air filter cotton in the process of use. Primary effect filter cotton is mainly made of polyester fiber through carding, mesh laying and heat sealing. The fibers are closely combined by 4D low melting point fibers through hot melting. To understand why air filter cotton should set a reasonable filtering wind speed, we need to first look at the working principle of air filter cotton. When the dusty gas passes through the air filter cotton, the dust particles also pass through the primary filter cotton with the air. At this time, the fiber of the filter cotton intercepts some dust particles. When the air bypasses the fiber, some dust particles cannot pass through the fiber and are intercepted. The closer the fiber is, the more dust particles are intercepted. After the interception, collision, inertia, diffusion and electrostatic action of the fiber, The primary filter cotton can effectively block about 90% of the 5 micron dust particles. Now let's take a look at the calculation method of wind speed. A is the area of air filtration, calculated in m2; L is the air volume, calculated in m3/h; V is the wind speed, calculated in m/s; The calculation formula of wind speed is: v=l/a/3600 3600 here is 3600s. Generally speaking, the smaller the wind speed is, the better the filtering effect is. Too much wind will reduce the interception rate of the fiber, so that the dust particles that were originally intercepted will be taken away by the wind speed, which greatly reduces the filtering efficiency. Generally speaking, it is reasonable that the filtration wind speed of the initial effect filter cotton is about 1-1.5m/s, so when the treatment air volume is large, we need to increase the filtration area to ensure the filtration wind speed, rather than blindly increase the wind speed.

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