Plate-type sludge dewatering machine and dewatering method therefor

Abstract

The invention discloses a plate-type sludge dewatering machine and a dewatering method therefore. The plate-type sludge dewatering machine adopts elastomers positioned among pressing filter plates, adjacent anti-thrust filter plates, air-inlet filter plates, feeding filter plates and thrust filter plates to form at least three hermetic pressing filter chambers variable in volume, utilizes the compression deformation and resilience of the elastomers to deep squeeze and dewater a filter cake, and adopts sealing plugs which are arranged in front of air-inlet holes of the air-inlet filter plates and the thrust filter plates and are on positions opposite to feeding holes on the feeding filter plates and the anti-thrust filter plates, wherein the feeding filter plates are adjacent and involutory to the air-inlet filter plates. After low-pressure filter dewatering is over and feeding is stopped, the sealing plugs block and seal the feeding holes so as to prevent sludge from flowing back and entering pipelines during pressing filtration. The dewatering method adopts the variable hermetic pressing filter chambers formed by the elastomers to perform pressing filtration and dewatering, and adds the operation of adopting the sealing plugs to block the feeding holes before high-pressure squeezing-dewatering operation. The invention has the advantages of high dewatering efficiency, strong adaptability, low energy consumption, low use cost and the like.

Description

technical field [0001] The invention relates to a sludge dewatering device and method, in particular to a plate-type sludge dewatering machine and a dewatering method, which are suitable for deep dehydration of urban domestic sludge, printing and dyeing sludge, distiller's grains, pulp and other sludge. Background technique [0002] Chinese Patent Publication No. CN201198463 "Sludge Dewatering Equipment" discloses a sludge dewatering equipment using flexible filter bags between a plurality of movable extrusion plates spaced apart from each other. The sludge volume can be dehydrated, but there are defects such as the flexible filter bag is easy to break, it is troublesome to turn over the bag, and the flexible filter bag cannot be kept clean. [0003] Publication No. CN101200342 "A Squeeze Sludge Dewatering Device and Its Working Method" discloses a dehydration device and a dehydration method for reducing the water content of the sludge by repeatedly squeezing the sludge in t...

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Problems solved by technology

[0002] Chinese Patent Publication No. CN201198463 "Sludge Dewatering Equipment" discloses a sludge dewatering equipment using flexible filter bags between a plurality of movable extrusion plates spaced apart from each other. The volume of sludge can be dewatered, but there are defects such as the flexible filter bag is easy to break, it is troublesome to turn over the bag, and the flexible filter bag cannot be kept clean.

The dehydration device and its dehydration method are beneficial to improve the dewatering efficiency of sludge; but there are the following disadvantages: 1. Because most of the sludge is corrosive, it is difficult to maintain the sealing matching between the material cylinder and the pressing plate for a long time. Leakage makes it impossible to effectively seal and squeeze the sludge; 2. Since one hydraulic cylinder can only be used for one material cylinder, the equipment cost is relatively high

[0004] Publication No. CN101088944 "Sludge Powerful Dewatering Machine" and Bulletin No. CN201099651 "New Sludge Powerful Dewatering Machine" disclose a sludge dewatering machine composed of several pressure filter plates that can be filled with oil and drained of oil. The pressing force of the plate and frame filter press is much greater than that of the plate and frame filter press, which improves the pressing efficiency; however, there are the following problems: 1. The oil pressure seal matching on the edge of the filter plate is difficult to maintain for a long time due to the corrosiveness of the sludge and the harsh working environment; 2. 1. The thickness of the filter cake on the filter press plate will inevitably be uneven due to the difference in the distance from the feed inlet. This uneven thickness will cause non-parallel between adjacent filter press plates, so it is impossible to guarantee Work normally in the oil tank for a long time; 3. When the filter press plate is pushed and pressurized, it will form a shearing effect on the filter cloth, which is easy to cut the filter cloth

However, this sludge pressing and filtering method lacks the step of closing the charging port between steps 2) and 3). Compressing the charging space without closing the charging port will inevitably cause the sludge to flow to the charging port after being pressurized. The problem of backflow or high solid content sludge blocking the filling port; between steps 3) and 4), the blowing step and the operation of closing the filling port are missing, and the filter cake is in the case of not closing the filling port Unloading will cause the remaining low-concentration sludge in the filling pipe to be mixed into the filter cake. If the filter cake is unloaded without blowing air, the filter cake will stick to the filter cloth, and the liquid on the drain side of the filter cloth will be returned to the filter cake. Suction and other issues

The sealing cooperation between the concave filter press plate and the convex filter press plate of the dehydration equipment adopts a mechanical seal, and the mechanical seal is difficult to maintain reliability for a long time in the harsh environment of direct contact with the sludge; the filter cake on the filter press plate The thickness will inevitably be uneven due to the difference in the distance from the feed inlet. This uneven thickness will cause the adjacent filter press plates to be non-parallel and thus cannot be effectively sealed.

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