In the filtration mechanism of filter material, such as diffusion, Filter Cloth gravity, inertia collision, electrostatic and other effects on the dust layer exist, but the main role is sieving. When the bag-type dust collector starts to run, there is no dust on the new filter bag, and a thin dust film is formed on the surface of the filter bag for a few minutes. Because the filter bag is woven by fiber, the dust will gradually form the bridging phenomenon between the fibers before the dust layer is formed and the diffusion effect. Filter Cloth Filter bag fiber diameter is generally 2,011,005 m. The diameter of needle felting fiber is more 10-205m. The distance between fiber is 10-305m, bridging phenomenon is very easy to appear. After the completion of bridging phenomenon 0.3-0.5mm dust layer is often called dust film or a dust layer. Dust in a dust layer above the accumulation of two times dust layer.
Plain fabric filter cloth itself dust removal efficiency of 85% 90%, Filter Cloth the efficiency is low. However, when the surface dust of the face pouring cloth accumulates, it can get more than 99.5% high dust removal efficiency. Therefore, it is necessary to remove dust, so that the surface of the filter cloth residue 0.3-0.5mm thick dust layer to prevent dust removal efficiency. The problem is how to complete the first dust layer in the process of dust remover, and only to clear the second dust layer, which is not only a technical problem but also a disposal experience for the design and manufacture plant. Therefore, it can be said that the history of bag-type dust collectors is a gradual and continuous improvement of history. Based on the influence of the dust layer on the efficiency, Filter Cloth the dust removal efficiency of the dust layer is decreased, and the flue gas is concentrated in this part because of the decrease of the pressure loss. Therefore, a few seconds after the filter cloth surface formed a dust layer, dust removal efficiency has risen, that is, each clearance cycle can be discharged a quantitative dust.
On the other hand, if the filter wind speed design properly, to the filter surface filter layer has a certain loss of pressure (often $number 1500Pa), that is, in the time required to reach a certain thickness of the filter layer, the time is inversely proportional to the filtration speed. The filtered wind speed is n times, the required time is/, the dust layer must be cleared at least n times per hour, in fact, Filter Cloth the time required for removal (10,130 s) should be considered, and N 10 times times should be taken. In addition, the use of Non-woven needle felt as a filter cloth, generally can be used 1.5 12.5mm thickness, this layer is equivalent to the previous dust layer, it exists in the inner layer of the filter cloth.
The flue gas and dust penetrate through the surface of the filter cloth, and in some way to remove the dust, the two functions of the foregoing are balanced, Filter Cloth in the inner layer of the filter cloth (felt layer), the thickness is 0.5--0.7mm, the layer of dust and filter cloth, which is called the inner layer filtration layer, is equivalent to the first filter layer of the plain weave fabric. However, the flue gas again accumulates on the surface of the filter cloth and becomes the dust layer two times. Filter Cloth In this way, the inner filter layer is interwoven with the fiber, which is different from the two dust layers, so it is only two dust layers and the inner filtration layer is easy to be completely preserved, so the dust removal efficiency will not be reduced.