The working principle of the box-type filter press The plate-and-frame filter room consists of a flat filter plate and a hollow filter frame. The filter cloth is fixed on the plate and frame. This is the main form of the early filter press. The main advantage is that it is easy to replace the filter cloth, the disadvantages are low efficiency, poor filtering effect and easy to break the filter plate; the filter chamber of the box-type filter press is composed of two adjacent recessed filter plates.
The working principle of a box-type filter press is to form a filter chamber by arranging filter plates (the two sides of the filter plate are recessed, and every two filter plates are combined into a box-shaped filter room).
The principle is as follows: the surface of the filter plate has pits and bosses to support the filter cloth. There are through holes in the center and corners of the filter plate. After assembly, it forms a complete channel, which can be used for suspension, washing water and filtrate. Both sides of the filter plate are supported by handles on the cross beam, and the filter plate is pressed by the pressing device. The filter cloth between the filter plates acts as a seal.
Under the pressure of the feed pump, the material liquid to be filtered is sent to each filter room, and the solid and liquid are separated through the filter medium (select the appropriate filter cloth according to different industries). A filter residue is formed on the filter cloth until the filter chamber is filled to form a filter cake. The filtrate passes through the filter cloth and flows along the grooves of the filter plate to the lower outlet hole channel for centralized discharge. After filtration, the filter residue can be washed with clean water. After washing, compressed air is sometimes passed in to remove the remaining washing liquid. After the filtration is completed, open the filter press to remove the filter cake (the filter cake is stored between the two adjacent filter plates), clean the filter cloth, and recompress the plate filter to start the next working cycle.
The filter cloth is fixed on the plate and frame. This is the main type of filter press in the early stage. The main advantage of the box filter is that it is easy to replace the filter cloth. The filter chamber of the filter machine is composed of two adjacent depressed filter plates, and the filter cloth is fixed on each filter plate. The main advantages of the box-type filter press are higher efficiency, better effect and relatively durable filter plates. (Under the same conditions), but the degree of automation is high, there is an automatic device for cleaning the filter cloth, and the frequency of replacing the filter cloth is generally not frequent.
The main advantages are less loss during feeding, fast filtration speed, high temperature and pressure resistance, good sealing performance, uniform cake washing, low water content, and uniform pressure in each filter chamber, and it is not easy to damage the board, which is basically suitable for all solid-liquid separation industries .