Flue gas and dust from the surface of the filter cloth through the surface, while 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, Filter Cloth which is called an inner filter layer, which corresponds to the primary filter layer of the plain weave fabric.
In the filtration mechanism of the filter fiber, such as diffusion, 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 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. 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%, Filter Cloth the efficiency is relatively low. But the surface of the surface of the surface pouring dust accumulation, you 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 problem is how the dust collector is finished during the operation to keep the first dust layer retained, and only the second dust layer is removed. Filter Cloth 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 through this part due to the decrease of the pressure loss. Therefore, Filter Cloth a few seconds after the filter cloth surface and the formation of a dust layer, dust efficiency has increased, that is, each clear cycle can be discharged a certain amount of dust.
On the other hand, if the filter wind speed is designed properly, to the filter cloth surface filter layer has a certain pressure loss (often 1000 a 1500Pa), Filter Cloth that is, within the required time to reach a certain thickness of the filter layer, the time is proportional to the wind speed The 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, in fact, must take into account the time required to clear (10 a 30s), Filter Cloth 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.