Pressure filter and pressure filtration method thereof

Abstract

The present invention discloses a pressure filter, which comprises multiple groups of filter plates, wherein the adjacent filter plates are arranged in a contact manner, and each filter plate is provided with a material channel and a pressure filtration space with a variable volume and for accommodating a material. One end of the material channel is communicated with the pressure filtration space, and the other end is communicated with the pressure filtration space of the adjacent filter plate. Each filter plate is further provided with an air channel for communicating the filter plate pressure filtration space and a liquid channel for communicating the pressure filtration space of the adjacent filter plate. Filter screens are arranged on both sides of the filter plates and are positioned inside the adjacent pressure filtration space, wherein a filter cloth is covered outside the filter screen. The pressure filter of the present invention has characteristics of fewer components, simple and reliable structure, and low equipment maintenance workload. The present invention provides a pressure filtration method. According to the pressure filtration method of the present invention, two-stage pressure filtration and one-stage drying are adopted, wherein the first stage is that a driving pump is adopted to feed the material to carry out pressure filtration, the second stage is that high pressure air pressurizes the filter cloth to carry out pressure pressing, and the third stage is that the material is dried with high temperature air, such that pressure filtration efficiency is improved, and effects of automatic material unloading and filter cloth cleaning are achieved through the high pressure air.

Description

technical field [0001] The invention relates to the technical field of filter press solid-liquid separation equipment, in particular to a filter press and a filter press method thereof. Background technique [0002] Filter press is a kind of equipment that separates materials from solid and liquid through pressure filtration. It is widely used in food, chemical, environmental protection and sewage treatment industries, especially for the separation of sticky and fine matter. It has unique advantages. For example, the sludge produced by chemical and domestic sewage treatment has a high water content and must be dehydrated to reduce its volume before it can be discharged. The cost of landfilling sludge is very high, which may reach 1,000 yuan per ton. After dehydration treatment, the volume will be reduced by more than 50%, which can significantly reduce the cost of sludge treatment in enterprises and reduce landfill sites. [0003] Traditional filter presses are classified a...

AI Technical Summary

Problems solved by technology

The medium used by the filter press to expand the diaphragm can be compressed air (used when it is below 0.7MPa) or water (used when it is above 0.7MPa). Used in the field of sludge dewatering, the plate and frame filter press is commonly used in the field of sludge dewatering

The above-mentioned presses have the following defects: 1. The working efficiency is not high enough, and the water filtration effect is not good enough; 2. There are many equipment parts, the workload of equipment maintenance is large, and the production and use costs are relatively high.

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