Plate and frame filter press

Plate and frame filter press is a mechanical device for chemical dehydration, which was first applied to chemical dehydration. Although the plate and frame filter press is generally operated intermittently, with high investment in infrastructure equipment, and low filtration capacity, it is still widely used in some sewage treatment plants due to its advantages such as high filtration driving force, high solid content of filter cake, clear filtrate, high solid recovery rate, and low consumption of conditioning drugs.

Structure of Plate and Frame Filter Press

The plate and frame filter press consists of a set of filter chambers consisting of alternately arranged filter plates and filter frames. The surface of the filter plate has grooves, and its protruding parts are used to support the filter cloth. There are through holes on the corners of the filter frame and filter plate, which form a complete channel after assembly, allowing for the passage of suspension, washing water, and the extraction of filtrate. On both sides of the board and frame, there are handles supported on the crossbeam, which are compressed by compression devices. The filter cloth between the plate and frame serves as a sealing gasket. The suspended hydraulic pressure is fed into the filter chamber by the feed pump, forming a filter residue on the filter cloth until the filter chamber is filled. The filtrate passes through the filter cloth and flows along the groove of the filter plate to the corner channel of the plate frame, and is discharged centrally. After filtration, clean the filter residue with detergent water. After washing, sometimes compressed air is introduced to remove the remaining washing solution. Subsequently, open the filter press to remove the filter residue, clean the filter cloth, re press the plate and frame, and start the next working cycle.

The function of the plate and frame filter press

Plate and frame filter press is used for solid-liquid separation. Compared with other solid-liquid separation technology equipment management, the mud cake filtered by the filter press has a high solid content and excellent separation control effect. With the changes in product model requirements, especially the changes in food filtration requirements, it is not only required that food filtration be simple and novel, but also to pay attention to the reliability of the material of the board and frame products. The plate and frame filter press uses some high-tech plate and frame materials, which are safe, non-toxic, and non-toxic

Heavy metals, different materials with relatively stable performance, make a significant contribution in food filtration. With the application of technology, today's plate and frame filter presses are not only used in other fields, but also widely used in the food industry.

The plate and frame filter press is suitable for suspensions with high or nearly incompressible compressibility of filter residue. The suitable concentration of solid particles in the suspension is generally below 10%, and the operating pressure is generally 0.3~0.6MPa, with special cases reaching 3MPa or higher. The filtering area can increase or decrease with the number of boards and frames used. The board and frame are usually square, with an inner edge length of 320-2000mm, a frame thickness of 16-80mm, and a filtering area of 1-1200 ㎡. The plate and frame are compressed using manual screws, electric screws, and hydraulic methods. The plates and frames are made of materials such as wood, cast iron, cast steel, stainless steel, polypropylene, and rubber. The fifth petrochemical plant uses polypropylene filter plates.

Working principle of plate and frame filter press

The plate and frame filter press is composed of five major parts: the filter plate, hydraulic system, filter frame, filter plate transmission system, and electrical system. The working principle of the plate and frame filter press is relatively simple. Firstly, hydraulic pressure is applied to compress the plate and frame group, and the sediment enters from the middle and is distributed among the filter fabrics. Due to the tight compression of the plate and frame, the mud cannot overflow. Under the high pressure of the screw pump and diaphragm pump, the water in the mud seeps out from the filter cloth and flows into the return pipe, while the mud cake remains in the cavity