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What affects the filtration efficiency of ultra-low resistance high efficiency filter unit?
What affects the filtration efficiency of ultra-low resistance high efficiency filter unit?The filtration efficiency of ultra-low resistance high-efficiency filtration units is affected by a variety of factors, as follows:Filter Properties Material: The filter effect of different materials is different. Such as glass fiber filter material, the fiber diameter is small, the pores are small, the interception ability of small particles is strong, and the filtration efficiency is high; And some ordinary chemical fiber filter materials, although the resistance is low, the filtration accuracy may be slightly inferior. Fiber diameter: In general, the finer the diameter of the fiber, the smaller the filtration pores formed, the stronger the interception and adsorption of particles, and the higher the filtration efficiency. For example, fibers with a diameter of 1-2 microns can trap more and smaller particles than fibers with a diameter of 5-10 microns. Filter material thickness: Thicker filters usually have more filtration levels and larger dust capacity, which can provide a longer filtration path, so that particles have more opportunities to be intercepted and adsorbed, thereby improving filtration efficiency, but at the same time may increase a certain amount of resistance. Running parameter Wind speed: When the wind speed is too high, the residence time of particles in the filter material is shortened, the contact chance with the filter material is reduced, and it is easy to penetrate the filter material, resulting in a decrease in filtration efficiency; If the wind speed is too low, the ventilation volume and the operating efficiency of the system may be affected. In general, the ultra-low resistance high-efficiency filter unit can maintain a high filtration efficiency when operating within the design wind speed range, beyond this range, the filtration efficiency may be affected. Temperature: Temperature changes affect the viscosity of the air and the physical properties of particles. In a high-temperature environment, the viscosity of the air is reduced, the movement of particles may be accelerated, and it is easier to penetrate the filter material; At low temperatures, the filter material may become hard and brittle, affecting its filtration performance. For example, in a high-temperature industrial environment, the filtration efficiency of the filtration unit may be slightly lower than that in a normal-temperature environment. Humidity: In a high humidity environment, the water vapor in the air may make the particles condense and become larger, which is easier to intercept by the filter material, but at the same time, the filter material may be damp, resulting in pore blockage or the performance of the filter material. When the humidity exceeds a certain limit, such as the relative humidity is higher than 80% for a long time, the filtration efficiency may be significantly affected. Particulates characteristic Particle size: Different particle size filtration efficiency is different. Generally speaking, the ultra-low resistance high-efficiency filtration unit has a better filtration effect on particles with a particle size of 0.3-5 microns, and for particles smaller than 0.3 microns, it may be easier to penetrate the filter material because of its Brownian motion and other reasons; For particles larger than 5 microns, although it is easier to be intercepted if the number is too large, it may also quickly block the filter material, affecting the filtration efficiency. Shape: irregularly shaped particles are more likely to be intercepted by the filter material than spherical particles because they have a larger contact area with the filter material and have more opportunities for collision and adsorption. For example, flake or fibrous particles are more easily captured by the filter material during filtration. Concentration: When the concentration of particulate matter in the air is too high, the dust capacity of the filter material will reach saturation faster, resulting in a decrease in filtration efficiency. For example, in sandstorm weather or areas with serious industrial dust emissions, the filtration unit needs to deal with a large number of particles and its filtration efficiency may be significantly reduced in a short time. Equipment maintenance Cleaning frequency: If the filter unit is not cleaned in time, a large amount of dust and particulate matter will accumulate on the surface of the filter material, blocking the pores of the filter material, reducing the amount of air passing and reducing the filtration efficiency. Regular cleaning can remove dust from the surface and restore the permeability and filtration performance of the filter material. Installation seal: Improper installation or poor sealing of the filter unit will cause unfiltered air to leak through the gaps, thereby reducing the overall filtration efficiency. Ensuring that the installation process is well sealed is the key to ensuring the normal function of the filter unit. |
