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.
Filter Plate Specialty
Filter plate is the main component of the filter press cake, Filter Plate filter plate performance directly affects the efficiency of the filter press, cost input, maintenance and maintenance workload. Rubber filter plate performance is better, the rubber filter plate with a lighter weight, Filter Plate damage to the filter cloth is not too serious, the filter plate after the slime easy to handle; at the same time improve the filter press sealing performance, production conditions; Top pressure, reduce the amount of maintenance.
Rubber filter plate is its unique characteristics of elasticity,Filter Plate but in use, due to the long-term use of the deformation of the filter plate serious, to the side of the bulging, resulting in a large number of filter plate due to deformation of cake thickness and sealing; Surface due to long-term extrusion, rubber elasticity or aging cracking, fatigue problems.
Rubber filter plate prone to poor discharge performance, poor drainage or water bag phenomenon, affecting the cake effect. The main reasons are the following: filter cloth damage, Filter Plate the solid material into the outer layer of the filter cloth, the part of the groove; poor quality filter or flush is not timely, affecting the effect of water; old rubber filter plate system is trench, if Filter cloth is not flat, to the filter press feeding, the filter cloth by the pressure, wrinkle part of the back into the tank, plug the drain trench, affecting the drainage effect; filtrate drainage system block, did not timely cleaning, The particle size, Filter Plate concentration, pressure and so on have different effects on the discharge performance.
Rubber filter plate on both sides of the handle fastening bolts broken and connected iron plate off. Filter plate on both sides of the handle and the filter plate with a rubber cushion layer, Filter Plate the two are not rigid body structure, resulting in a certain number of shear force after the break to break or pull off. Filter plate handle is three iron plate welding, the outside and then covered with a piece of iron welded together, Filter Plate easy to pull off the whole, so that the filter plate scrapped. Solution: remove the filter plate and the handle of the joint surface of the rubber, so that the combination of the two is rigid body connection; the original bolt fastening structure to double-headed silk, double mother fastening; strengthen maintenance, often check the handle tight Solid bolt tightening situation, Filter Plate found loose and timely tightening; Filter Plate consider the filter plate rigid body as a whole structure.
Van filter press the general thickness of the filter between 60 ~ 85mm, each filter plate are square, in the filter plate on both sides of the reduced about 40mm to the internal concave down, the general depression down to the depth of about 25mm, The point is also dissatisfied with a high about 8mm protrusion, Filter Plate can be round, you can make the bar. This is the role of the filter plate in the process of re-filtration of the filter cake produced a good contact, so as to support the role of cake.
Van filter press filter structure there are different, Filter Plate it has two kinds of filter plate structure: the general filter plate and the border of the filter plate. Border filter plate is used to insert the filter plate of the square half of the phase made. Filter Plate These two kinds of filter plate staggered into the frame filter press filter room.