SU567471A1 - Suspension purification filter - Google Patents

Description

(54) FILTER FOR CLEANING SUSPENSIONS

I

This invention relates to the field of filtration. It can be used for the filtration of saturation juices in sugar industry.

Continuous filters are known, made in the form of rotating hollow disks placed in a closed chamber on the hollow shaft, divided into segments covered with filter cloth, with filtrate being withdrawn from them through the hollow shaft, and an auger for removing sediment. In the lower part of the chamber above the screw between the discs, lead-in and inlet chambers are installed.

The regeneration of the filter segments is carried out by pressurized air, which is then applied to a slurry layer.

The disadvantage of such filters is the high consumption of filter cloth due to rapid wear and its deterioration in the quality of the filtrate in the first period after cleaning the filter segments.

The closest to the described invention to the technical essence and the achieved result is a self-cleaning filter consisting of

with flat disc filtering elements and backwashing devices, made co-axially mounted. go with the filter housing of the rotating canopy of the shaft with boxes for cleaning the surface of the filter elements.

However, with such a device, the entire sediment from the filter elements is washed off with a filtrate, which leads to intensive consumption of it and a decrease in filter performance; the liquefied sediment requires additional separation depending on the filtration process. As all the sediment from the filter elements is carried away, the filter elements are bare, which degrades the quality of the filtrate.

The aim of the invention is to improve the filter performance and the efficiency of the cleaning process by filtering through a constantly renewing sediment layer.

Claims (2)

This is achieved by the fact that the device for removing the sediment is made in the form of a hollow sector, having a channel for draining the filtrate after regeneration, connected to the purge chamber. At the same time, ituly shaft is equipped with partitions, radially installed over each hollow sector. FIG. 1 shows the described filter, a general view; FIG. 2 is a section according to A. FIG. Ij in FIG. 3 hollow sector in axonometry. The filter includes a vertical cylindrical body 1 inside which a hollow shaft 2 passes. In the latter, hollow disk filter elements 3 and chambers 4 are fixed to receive the filtrate. Above the filter elements 1a & the slots of the housing of the apparatus are inserted hollow sectors 5 for removal of the lower layer of sediment from) ashirata. The precipitate from the apparatus is discharged into chamber 6, mounted on its body. In the lower Edge of the rear guiding wall of the hollow sector, a channel 7 is made, under which the filter element is regenerated. The channel is connected by a piping system 8 and 9 to the purge chamber, into which a portion of the filtrate intended for regeneration is discharged. Above the hollow sectors 5 on the hollow shaft there are reinforced radial vertical partitions 10, which prevent the sectors from increasing the upper layer of the sludge. The filter works in the following way. The suspension enters the apparatus and is filtered through the filter elements 3, and the filtrate from the chambers and through the hollow shaft 2 is withdrawn to production. During the slow rotation of the hollow shaft with filtering elements, chambers 4 and radial vertical ridges of the Yu top sheet of the hollow sector 5 with a sharp leading edge, splitting into a slime sediment of optimum thickness deposited during the filtration process on the filtering element, it divides into : lower compacted And upper, less compacted. At the same time, as the shaft with the elements rotates, the first layer of sediment is retracted into the chamber 6, and the second layer of sediment, falling through the partitions H, settles on the filter element 3 behind the Biv sector. Further filtration process serves as the basis for filtration. In the area of the filter element located in each. This instant of time under the channel, in the lower edge of the rear guide wall of the hollow sector, a reverse filtrate current occurs due to the pressure difference in the filtrate chambers and the purge collection chamber associated with the duct system 8 and 9. During one revolution of the hollow shaft the entire filter element. Thus, filtration processes in the filter, removal of sediment and regeneration of the filtering element occur simultaneously and continuously. The use of the proposed filter allows to obtain a filtrate of high quality, not required; additional cleaning. In addition, the layer of sediment left behind the sectors provides a transition from expensive gkan to metal meshes with large openings that serve only as a supporting base for the shrinkage. The capacity of the filter rises due to a reduction in the consumption of filtrate to wash the sediment. Claim 1. FILTER for cleaning suspensions, co. holding a cylindrical housing, a hollow ale with disc filtering elements fixed on it, a chamber for receiving filtrate, a purging chamber and a device for removing sediment, so that, in order to increase the filter performance and process efficiency purification by filtering through a constantly renewing layer; sediment; a device for removing sediment is made in the form of a hollow sector, having a channel for draining the filtrate after regeneration, connected to the flow chamber. 2. A filter for cleaning a slurry of claim 1, wherein the hollow shaft is provided with baffles radially mounted above each hollow sector. Sspsenny UpodyS / fo HSE