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Filter Cloth Screening Effect

Flue gas and dust penetrate through the surface of the filter cloth, 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 , A layer of dust and filter cloth fibers, which is called an inner layer, corresponding to the primary filter layer of the plain weave

In the filtration mechanism of filter fiber, such as diffusion, Filter Cloth gravity, inertia collision, electrostatic and other effects on the dust layer is present, but the main screening effect. When the bag filter begins to run, there is no dust on the new filter bag, and after a few minutes of operation, Filter Cloth a thin dust film is formed on the bag surface. As the filter bag is made of fiber weaving, so the dust layer is not formed before the dust will be in the role of diffusion and other effects gradually formed in the fiber between the fiber bridge phenomenon. Filter Cloth Filter bag fiber diameter is generally 20 to 1005m. Needle felt fiber diameter of 10-205m. The distance between the fibers is mostly 10-305m, the bridge phenomenon is easy to occur. Filter Cloth Bridge after the completion of the phenomenon of 0.3-0.5mm dust layer is often referred to as dust or a dust layer. In a dust layer above the accumulation of dust again said secondary dust layer.

Plain fabric filter cloth itself dust removal efficiency of 85% to 90%, the efficiency is relatively low. But the surface of the surface pouring dust accumulation, Filter Cloth can get more than 99.5% high dust removal efficiency. It is necessary to remove the dust, the filter cloth surface residual 0.3-0.5mm thick dust layer to prevent the dust removal efficiency. The question is how the dust collector is finished during the operation of the dust collector, and only the second dust layer is removed. This problem is both a technical problem and a disposal experience for the design and manufacturing plant. So you can say that the history of bag filter, is the gradual improvement of the history of continuous improvement. Based on the effect of the dust layer on the efficiency, the dust removal efficiency in the dust layer is drastically decreased. At the same time, the flue gas flows in this part due to the decrease of the pressure loss. Filter Cloth Therefore, after a few seconds the surface of the filter cloth and the formation of a dust layer, dust removal efficiency has increased, that is, each removal cycle can discharge a certain amount of dust.

Flue gas and dust penetrate through the surface of the filter cloth, 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 , 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, Filter Cloth and the secondary dust layer compared to its nature is very different, so only the secondary dust layer is removed, the inner filter layer is easy to completely retain, so the dust removal efficiency after removal of dust is not Will drop. Filter Cloth The adhesion of the dust on the filter cloth is very strong when the filtration rate is 0.28 m /. , 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, Filter Cloth 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, Filter Cloth otherwise it will form too high resistance, or the automatic landing of the dust layer, resulting in dust "dust" phenomenon, reduce the effect of dust collection.