RU2205057C1 - Sector member of disks ceramic filter - Google Patents

Abstract

FIELD: filtering devices. SUBSTANCE: sector member of disks ceramic filter has unit of porous ceramics, in which internal members for formation of hollow volume are located in rows with displacement over curves of concentric circumferences. In this case, ratio o conjugation radius between walls inside hollow unit in lower part of sector member to radius of conjugation line in its upper part amounts to 0.5-0.75. Hollow unit has neck to which outlet pipe is connected by means of threaded joint with tight seal. EFFECT: higher efficiency and strength of sector member of disk ceramic filter. 2 dwg, 1 tbl

Description

 The invention relates to the field of filtering devices, in particular, to the design of a ceramic disk filter, and can be used on disk-type filtration plants for filtering enrichment products by separating liquid-solid suspensions.

 The prior art filter element of the disk filter, which is made of ceramic in the form of a circular sector and includes the body of the filter element made of porous ceramic, and has dead-end channels that intersect, each of which is connected to the hole of the filtrate outlet, and the open pores of the body in connections with channels have increased dimensions in the direction of the filtrate exit and reduced to the level of micropores in the filtering surface (patent application of Ukraine 2000116432, MKI B 01 D 29/00, C 04 B 38/00, from 11/14/2000).

 A disadvantage of the known device is that the intersecting channels form internal elements that form a hollow volume, which during the filtering process create “dead zones”, leading to a decrease in the permeability of the ceramic body along the filter surface and, as a result, reduce the performance and humidity of the cake.

 By technical nature, the closest to the proposed one is a sector element of a disk ceramic filter containing a hollow block of porous ceramics with the radii of the mating lines of the walls in the upper and lower parts, including internal elements and a neck with an outlet pipe (see patent DE 3641057, class C 04 In 38/00, publ. 16.06.88).

 However, the known device obtained by casting using a plaster mold does not provide the necessary performance, and its design does not differ in sufficient strength.

 The technical result is to increase the productivity and strength of the device.

 This is achieved by the fact that in a sector element of a disk ceramic filter containing a hollow block of porous ceramics with the radii of the mating lines of the walls in the upper and lower parts, including internal elements and a neck with an outlet pipe, according to the invention, the internal elements are arranged in rows with an offset along the arcs of concentric circles and with the formation of a hollow volume, and the ratio of the radius of the mating line between the walls inside the hollow block in the lower part of the sector element to the radius of the mating line the upper part is 0.5-0.75, while the outlet pipe is connected to the hollow block by a threaded connection with a tight seal.

 The essence of the invention lies in the fact that the implementation of the proposed device in the above manner allows you to provide the necessary strength and performance.

 Comparison of the proposed device with the prototype allows us to claim compliance with the criterion of "novelty", and the absence of distinctive features in the analogs indicates compliance with the criterion of "inventive step".

 Preliminary tests allow us to judge the possibility of wide industrial use.

 In FIG. 1 shows a proposed sector element of a disk ceramic filter; figure 2 is a section along the midline aa of figure 1.

 The device comprises a hollow block 1, including internal elements 2, which are arranged in rows with offset along arcs of concentric circles with the formation of a hollow volume 3, and side walls 4.

 The hollow block 1 is made of porous ceramic with radii R and r of the pairing lines in the upper and lower parts 5 and 6 of the sector element, respectively.

 In addition, the device contains an outlet pipe 7, the connection of which with the hollow block 1 is made by a threaded connection with a tight seal 8.

 A design feature is that the ratio of the radius r of the interface line between the walls inside the hollow block 1 in the lower part of the sector element to the radius R of the interface line in its upper part is 0.5-0.75.

 The arrangement of the internal elements 2 by displaced rows along the arcs of concentric circles gives the filtering surface a wave shape, which intensifies the process of picking the cake and its uniform distribution.

 The ratio of the radii r and R of the pairing lines inside the block below 0.5 increases the tensile stress in the upper part of the sector element in the place of the pairing of the walls, which leads to breaking loads lower than the strength of the material of the filtering surface when blowing cake, especially when filtering fine-grained products. As a result, the structural strength and the service life of the filter surface are reduced.

 The ratio of the radii r and R of the interface lines between the walls inside the block above 0.75 reduces the total filtration area and increases the integral humidity of the cake, which leads to an increase in drying time.

 The threaded connection of the pipe 7 with the hermetic seal 8 increases the connecting connection of the metal pipe 7 with the ceramic block 1, and the hermetic seal 8 prevents the pressure decrease during the blowing of the cake during the regeneration of the filter surface.

 Using the outlet pipe 7, the sector is attached to the hollow shaft of the filter unit. Ceramic disc filter is composed of twelve sectors. During the rotation of the filter unit shaft, the sector of the disk ceramic filter is partially immersed in the reservoir for the substance to be filtered. As a result of suction through the hollow shaft, the filtration process begins through the porous hollow block 1 and the internal elements 2. The filtrate is collected in the hollow volume 3 formed by the internal elements 2 and the side walls 4 of the porous hollow block 1. The incoming filtrate is removed through the outlet pipe 7, the cross section of which allows output per unit time the volume of liquid is not less than the volume of the incoming filtrate.

 On the filtering surface of the hollow block 1, a solid precipitate forms, which is removed by a scraper installed at the position of entry of the sector into the tank. The sector element purified from sludge is operational during subsequent cycles of immersion in the tank for the substance that needs to be filtered.

 As a result of repeated, cyclical use of a disk ceramic filter, a thin layer of filtered sediment is formed on the filtering surface of the hollow block 1, which is not removed by a scraper. This layer increases the hydraulic resistance and reduces the performance of the device.

 In this case, periodic regeneration of the filtering surface of the porous hollow block 1 is carried out by back-flushing with regenerating components. Through the outlet pipe 7 serves the regenerating component under excess pressure in the hollow volume 3.

 The increased pore size at the inlet of the regenerating component has little effect on hydraulic resistance to flow, and the main pressure is concentrated in areas located near the filtering surface of the hollow block 1, which leads to an intensification of the regeneration process. During regeneration, the internal elements 2 act as stiffeners, increasing the strength of the structure as a whole.

 After regeneration, the sector of the ceramic disk filter is used in subsequent multiple cyclic operating conditions as part of the ceramic disk filter.

 Comparative tests have shown that the use of the proposed sector in comparison with the known one allows to increase productivity by 2 - 2.5 times with identical cake moisture.

 The table shows the test results of the prototype and the proposed technical solution with a different ratio of the radii of the mating between the walls inside the block.

 Thus, in the proposed technical solution, the delivered technical result is achieved.

Claims (1)

 A sector element of a ceramic disk filter containing a hollow block of porous ceramic with radii of the mating lines of the walls in the upper and lower parts, including internal elements and a neck with an outlet pipe, characterized in that the internal elements are arranged in rows with an offset along the arcs of concentric circles and with the formation of a hollow volume, and the ratio of the radius of the interface line between the walls inside the hollow block in the lower part of the sector element to the radius of the interface line in its upper part ulation 0.5-0.75, Compound outlet a hollow threaded fitting unit implemented with a hermetic seal.

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