Stacked screw filter press manufacturer
The mixed liquid flows into the filter cartridge of the stacked screw press filter through the feed port. The filter cartridge is alternately assembled by fixed laminations and movable laminations. Under the action of the driving force of the spiral shaft rotary vane, the material moves to the outlet end. As the pitch between the spiral shaft rotary vane is gradually reduced, the pressure on the sludge also increases gradually, and dehydration begins under the action of pressure difference. Free water flows out from the filter gap between the movable plate and the fixed plate.
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Keywords: stacked screw sludge dewatering machine, multi-disc sludge dewatering machine, belt filter press
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The mixed liquid flows into the filter cartridge of the stacked screw press filter through the feed port. The filter cartridge is alternately assembled by fixed laminations and movable laminations. Under the action of the driving force of the spiral shaft rotary vane, the material moves to the outlet end. As the pitch between the spiral shaft rotary vane is gradually reduced, the pressure on the sludge also increases gradually, and dehydration begins under the action of pressure difference. Free water flows out from the filter gap between the movable plate and the fixed plate. Since the diameter of the spiral shaft rotary vane is larger than the aperture of the movable plate, when the spiral shaft rotary vane rotates, the movable plate is driven to rotate together. The stacked screw filter press equipment relies on the relative movement between the movable plate and the fixed plate to realize the self-cleaning function, prevent the filter gap from being blocked, and the mud cake is discharged from the discharge port under the pushing action of the spiral shaft after being fully dehydrated. Since there is always relative movement between the fixed plate and the movable plate, there are always some fine sludge particles squeezed out from the gap with water. In order to prevent overflow sludge particles from depositing on the surface of the filter barrel, an automatic water spray flushing system is set up to regularly spray and clean the surface of the filter barrel to maintain the cleanliness of the filter barrel surface. The effluent of the stacked screw filter press always has a certain turbidity. Because the filtered effluent returns to the biochemical system, it is allowed that the filtrate has a certain turbidity. The gap between the fixed plate and the movable plate has been fixed at the factory and cannot be adjusted at will. The moisture content of the filter mud cake can be adjusted by adjusting the gap and feeding amount of the back pressure plate.
The plate-frame filter and the belt filter with filter cloth as the filter medium are used to separate the sludge particles from the free water by the squeezing force applied on the mud cake during the pressure filtration. The dewatering effect is related to the acting pressure and the acting time, and the force direction of the mud cake is opposite to the dewatering flow direction. The advantage is that the dewatering effect is good, the disadvantage is that the filter cloth is easy to block, cleaning is troublesome, and the pressure filter blockage of oily or colloidal sludge is more serious.
Centrifugal dewatering is to use the centrifugal force acting on the sludge to realize the separation of sludge particles and free water. The dewatering effect is related to the density difference between sludge particles and water. The force direction of the mud cake is perpendicular to the dewatering flow direction, which is 90 °. The disadvantages are large noise, high energy consumption, poor dehydration effect when the density difference between sludge particles and water, and accumulation of fine particles on the inside of the filter to form a dense layer, which increases the separation resistance of free water and is not applicable to the pressure filtration of viscous sludge.
The thin-layer dewatering principle is used in the stacked screw type sludge filter press, each mechanical force is only applied on a layer of thin mud cake, so that the free state water in the sludge is separated from the mud in a short distance and fast speed. The force direction of the mud cake is the same as the flow direction of the water, which is 0 °. Therefore, the energy consumption of the stacked screw filter press is low. Since the stacked screw filter press is a filter cartridge structure, one or more parallel units can be selected according to the size of the material to be processed. Because the stacked screw filter press has a self-cleaning function, it is especially suitable for the pressure filtration of viscous sludge.
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