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Filter Cloth With The Increase

If the filter wind speed is designed properly, Filter Cloth to the filter cloth surface filter layer has a certain pressure loss (often 1000 a 1500Pa), Filter Cloth that is, in the required time to reach a certain thickness of the filter layer, the time and the filter wind speed is inversely proportional. Take the filter speed of n times, the required time is 1 / n, the number of times the dust layer must be removed at least n times per hour, Filter Cloth in fact, must take into account the time required to clear (10 a 30s), should take n ten times. In addition, the use of non-woven needle felt as a filter cloth, generally can be used 1.5 to 2.5mm thickness, Filter Cloth this layer is equivalent to the previously mentioned and a dust layer, it exists in the filter cloth inner layer.

Flue gas and dust penetrate through the surface of the filter cloth, while in some way to remove the dust, the two effects of the balance, the filter cloth in the inner layer (felt layer) to form a thickness of 0.5-0.7mm , Filter Cloth Which is a layer of dust and filter cloth fibers, which is called an inner filter layer, which corresponds to the primary filter layer of the plain weave fabric. However, the flue gas is re-deposited on the surface of the filter cloth to become a secondary dust layer. So that the inner filter layer with the fiber intertwined, and the secondary dust layer compared to its nature is very different, so only the secondary dust layer is removed, Filter Cloth the inner filter layer is easy to completely retain, so the dust removal efficiency after removal of dust is not Will drop. Dust in the filter cloth on the adhesion is very strong, when the filtration rate of 0.28m / min, Filter Cloth the diameter of 105m dust particles in the filter on the adhesion can reach 1000 times the particle weight, 55m dust particles in the filter On the adhesion can reach the particle weight of 4200 times. So after the filter bag cleaning, the dust layer will continue to exist. The presence of the dust layer, so that the screening process greatly enhanced the role of screening, filtration efficiency also increased. Dust layer formed by the sieve than the filter fiber gap is much smaller, the screening effect is obvious.

The formation of the dust layer is related to the filtration rate. When the filtration rate is high, the dust layer is formed faster. When the filtration rate is very low, Filter Cloth the dust layer is formed slowly. If you simply consider the dust layer of the filter effect, 'low filtration rate is not good. When the dust layer continues to thicken, it must be removed in a timely manner by means of cleaning, otherwise it will form too high resistance, Filter Cloth or the automatic landing of the dust layer, resulting in dust "dust" phenomenon, reduce the effect of dust collection.

Surface filtration mechanism:

Based on the formation of dust layer is conducive to the theory of filtration, artificially in the ordinary filter surface covered with a layer of microporous film to improve the dust removal effect. Filter Cloth So the membrane surface of the film, also known as artificial dust layer. In order to control the capture efficiency of different particles, the pore size of the microporous surface films of different uses is changed. For example, when filtering ordinary dust, the pore size is usually less than 25um; when filtering bacteria, Filter Cloth the pore size is less than 0.35um; when the virus is filtered, the pore size is less than 0.055um. This difference is like a sieve, according to the screen sieve under the requirements of the selection of different sieve screen.