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Monofilament Polyester air slide fabric dust layer mechanism

Font Size:big - mid - smallehangzhouhengke   Release time 13-07-17 10:30     view:178   coomment:0   source:

 In monofilament air slide fabric mechanisms, such as diffusion, gravity, inertial impaction, electrostatic and other effects on the dust layer is there, but the main thing is sieving effect. Starts running in the baghouse, the new dust bag is not running after a few minutes in the bag surface to form a thin film of dust. Because the bag is woven with fiber, so the dust layer is not formed before the effect of dust in the role of diffusion of dust gradually formed between the fibers bridging phenomenon. Bag fiber diameter is generally 20 to 1005m. Fiber diameter needle felt more for 10-205m. The distance between the fibers are mostly 10-305m, it is prone to bridging phenomenon. After the completion of bridging phenomena dust layer of 0.3-0.5mm often referred to as a film or a dust layer of dust. In a dust layer above the accumulation of dust again called secondary dust layer. 

Monofilament polyester plain weave cloth itself removal efficiency of 85% to 90%, the efficiency is relatively low. But Hom face pouring cloth surface accumulation of dust adhesion can be achieved when more than 99.5% of the high collection efficiency. It is necessary, after the removal of dust, the cloth surface residual 0.3-0.5mm thick layer of dust to prevent the removal efficiency. The question is how to accomplish dust during operation so that the first layer of dust retained, but only a second layer of dust cleared, the problem is both the design factory technical problem, but also a disposition experience. Therefore we can say baghouse history, history of continuous improvement is gradual. Based on the efficiency of the dust layer, so the dust layer peeling off some dust removal efficiency declines dramatically; Meanwhile, the pressure loss is reduced, the flue gas in this part of the concentrated flow. Therefore, after a few seconds cloth surface and the formation of the dust layer, dust removal efficiency has risen, that is, each purge cycle can discharge a certain amount of dust. On the other hand, if the filtration velocity is properly designed, the filter layer to the cloth surface a certain pressure loss (usually 100 () One 1500Pa), i.e. the time required to reach a certain thickness of the filter layer, the time and the filtration velocity inversely. And filtration velocity is n times, the time is 1 / n, h must 
Clear dust layer is at least n times the number actually must consider the time required to clear '(10 a 30s), should take n ten' times. In addition, the use of a non-woven needle felt cloth type, one may generally be 1.5 2.5mm thickness, this layer is equivalent to a dust layer mentioned before, it is present in the inner layer of cloth. Smoke and dust from the surface of the permeate through the filter cloth, while in some way to remove dust, the foregoing two effects balance after the inner filter cloth (felt layer) is formed with a thickness of 0.5 - 0.7mm , the dust and fibers entangled into a layer of cloth, which is called the inner filter layer, an amount of the first filter layer plain weave fabric. However, the flue gas is deposited on the surface of the cloth again become the secondary dust layer. 
Such inner filter layer with fibers intertwined, and the secondary layer of dust compared to its nature very different, so clear is just secondary dust layer, the inner filter layer on the ease completely retained, so after clearing dust collection efficiency is not will decline. Adhesion of dust on the filter cloth is very strong, when the filtration rate of 0.28m /. When the diameter of 105m dust filter on the adhesion of particles can reach 1,000 times the particle weight, 55m dust filter on the adhesion of particles can reach 4200 times the particle weight. So after cleaning the filter bag, dust layer will continue to exist. The presence of dust layer, so that the filtration process greatly enhanced the role of screening, filtration efficiency increases. Dust layer forming mesh gap is much smaller than the filter fibers, the screening effect is obvious. 
Dust layer formation and filtration velocity, filter dust layer is formed at higher speeds faster; filtration rate is low, the dust layer is formed slowly. If you simply consider the filtering effect of the dust layer, low filtration rate might not be beneficial. Dust layer continues to thicken, it must be timely cleaning method to remove, otherwise it will form a resistance is too high, or the automatic landing dust layer, resulting in dust between the "leakage" phenomenon, reducing dust trapping effect.

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