SU762926A1 - Disc filter - Google Patents

Description

The invention relates to filtering, in particular to disk filters with horizontal placement of filtering tanks designed for separating suspensions in chemical- '5

chemical, petrochemical, food and other industries.

Known disc filter containing a cylindrical body, a hollow shaft of the discs mounted on it, and a device for regeneration, made in the form of brushes placed on the surface of the disks [1].

The disadvantage of the filter is that when filtering viscous suspensions containing resinous or fibrous sediments, the removal of sediment from the filtering surface is bad. In addition, the removed precipitate returns to the chamber of the initial suspension, deteriorating the filter operation from cycle to cycle. When the sediment is partially removed from the filtering surface of the disks, the sediment is mechanically compacted with brushes, which causes a decrease in filter performance. A disk filter is also known, in which the device for regeneration is made in the form of hollow ducts, 30

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mounted above the filtering surface of the disk and rigidly connected to the collector for removal of the washing liquid [2].

The disadvantage of this filter is that the box is fixed with respect to the filtering surface of the discs, and this makes it impossible to adjust the thickness of the sediment layer depending on the efficiency and quality of the filtrate, and also to use a filter to separate suspensions with different sediment properties.

The purpose of the invention is to improve the performance and efficiency of regeneration of filter discs, by updating and maintaining a constant resistance of the layer of sediment on them.

This goal is achieved by the fact that the collector drainage of the filtrate together with the boxes is installed with the possibility of axial movement and is equipped with a servo drive, and the fact that the boxes have the shape of truncated sectors located apex to the axis of rotation of the disks, and the filter is equipped with a differential pressure sensor on. filter discs electrically connected to the servo.

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762926

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The drawing shows schematically the filter, the general view.

The disk filter consists of a housing 1 with an upper 2 and a lower lid 3, which form the chamber 4 of the original product. In the housing 1 'there are hollow filtering discs 5, installed at some distance from each other, with filter partitions 6 rigidly articulated with a hollow rotating shaft 7, the cavities of which are interconnected. The filtrate is discharged through the hollow shaft 7.

For regeneration of filter discs (removal of thickened slurry), between them are installed turned down cleaning boxes 8, rigidly connected to a hollow collector moving along its axis 9. Cavities of boxes are connected to a collector cavity. Rotation of filter discs

"It is carried out by the drive 10, and the movement of the cleaning boxes is performed together with the collector from the servo 11." The original suspension enters the housing 1 through the pipe 12, and the sediment (thickened suspension) is discharged through the pipe 13.

For uniform distribution of the initial suspension in the cavity of the housing is installed distribution visor 14..

Disk filter works as follows.

The original suspension under pressure in a continuous stream is fed through the nozzle 12 into the chamber 4 of the original product. The flow of the suspension is distributed evenly around the perimeter of the housing 1 by means of the distributor visor and fed to the rotating filter discs 5, where the suspension separates with sedimentation on the filtering surface. During the separation process, the sediment layer increases, the hydraulic resistance of the sediment layer increases, and with this, the separation capacity increases and the filter performance decreases. The height of the sediment layer is limited by the position of the cleaning chutes 8 with respect to the filter septum.

Since the cavities of the grooves are connected to the cavity of the collector 9, the suspension in which is under atmospheric pressure, then the action of the pressure drop in the chamber 4 th cleaning boxes 8 sediment (or thickened suspension) is forced into the box and discharged through the collector 9. The filtrate from the filter cavities drive 6 enters the hollow shaft 7 and is discharged from

filter.

The collector 9 with boxes 8 is equipped with a servo drive with a tracking and regulating system (not shown in the drawing), providing in the automatic mode the position of the grooves relative to the filter disks 5 in. depending on the pressure drop across the filter bed.

The possibility of vertical movement of the gutters and regulation of the pressure drop across the filter septum, which are achieved by the invention, maintains a constant resistance of the sludge layer, and with it, stabilizing the separation capacity, eliminating the need for periodic cleaning of the filter, increasing its performance and makes it possible to rearrange the filter for filtering various suspensions.

Claims (3)

Claim 1. Disk filter containing. cylindrical body, hollow shaft, with rotating filter discs installed on it, and a device for regenerating filter discs by reverse filtrate made in the form of down-turned boxes connected to a wash filtrate collector, characterized in that, in order to improve the performance and efficiency of regeneration of filter discs, by updating and maintain a constant resistance of the sediment layer on them, the collector for drainage of the filtrate together with the ducts is installed with the possibility of axial movement and is equipped with voprivodom. 2. Filter pop. 1, characterized in that the boxes are in the form of truncated sectors, located apex to the axis of rotation of the disks. 3. Filter by π. 1, characterized in that it is equipped with a differential pressure sensor on the filter discs, electrically connected to the servo drive.