RU184254U1 - Flotation hydrocyclone - Google Patents

Abstract

The utility model relates to the field of wastewater treatment containing pollutants in the form of suspended solids, oils, oil products, and can be used in mechanical engineering, metallurgical and oil refining and other industries.

The technical result to which the proposed device is aimed is to increase the productivity of the cleaning process and increase the reliability of the apparatus.

In a device comprising a housing, a centrifugal separation chamber with a tangential nozzle for supplying purified water, a flotation chamber with an air supply manifold and a filter screen on the wall of the flotation chamber, in the upper part of the flotation chamber, in the horizontal plane of the tangential inlet nozzle, there is a movable ring with blades mounted on it connected to a spiral scraper sliding on the surface of the filter mesh. The air supply manifold in the flotation chamber is made in the form of a movable drum with a system of tangential openings. Above the flotation chamber there is a foam collector with an air (pneumatic) air-blowing system and foam discharge to the tangential branch pipe and an inclined reflective visor is installed in front of the purified water discharge branch pipe.

Thus, the proposed device can improve the reliability of the apparatus by eliminating the siltation of the filter mesh and increases the performance of the cleaning process due to the continuous regeneration of the filter element. 3 s.p. f-ly, 5 ill.

Description

Flotation hydrocyclone belongs to the field of wastewater treatment containing pollutants in the form of suspended solids, oils, oil products and can be used in mechanical engineering, metallurgical and oil refining and other industries. Known devices for purifying water from pollutants using multilayer filter elements, for example according to patent No. 2075446 (bull. No. 8 from 03/20/97.). In this device, during operation, the filter elements are silted up and they must be periodically either replaced or by stopping the cleaning process, regenerated, which reduces the productivity of the process.

A device for water purification is known in which a combination of centrifugal separation with filtration through a fiber nozzle is carried out (invention according to AS No. 1701647, bull. No. 48 of 12.30.91.). In this device for regenerating the fiber nozzle, the cleaning process is stopped and compressed air is supplied through the fiber layer, and the cleaning performance is reduced.

A device for wastewater treatment (invention according to AS No. 785203, bull. No. 45 from 07.12.80.), Which uses a combination of centrifugal separation, flotation and filtration. This device is taken by us as a prototype.

The disadvantages of the prototype are as follows. The mesh filter element 10 is silted during operation and must be periodically regenerated, stopping the device, as a result of which the productivity of the cleaning process is significantly reduced. Secondly, it is difficult to drain the foam from the nozzle 5, in which clogging plugs may form.

The technical result to which the proposed device is aimed is to increase the productivity of the cleaning process and increase the reliability of the apparatus.

The technical solution is achieved by the fact that in a device containing a housing, a centrifugal separation chamber with a tangential nozzle for supplying purified water, a flotation chamber with an air supply manifold and a filter mesh on the wall of the flotation chamber, in the upper part of the flotation chamber, in the horizontal plane of the tangential inlet nozzle a ring with blades mounted on it, connected to a spiral scraper sliding on the surface of the filter screen. The air supply manifold in the flotation chamber is made in the form of a movable drum with a system of tangential openings. Above the flotation chamber there is a foam collector with an air (pneumatic) air-blowing system and foam discharge to the tangential branch pipe and an inclined reflective visor is installed in front of the purified water discharge branch pipe.

The proposed device is presented on:

FIG. 1. - general view of the device.

FIG. 2. - The scheme of blowing foam.

FIG. 3. - section of the tangential water supply.

FIG. 4. - flotation chamber diagram

FIG. 5. - arrangement of perforations

Here:

1 - housing;

2 - filter mesh;

3 - spiral scraper;

4 - blades;

5 - ring;

6 - upper bottom;

7 - a chamber for collecting foam;

8 - pipe air supply (blowing foam);

9 - pipe supply of source water;

10 - mesh filter element;

11 - flotation chamber;

12 - pipe supply flotation agent (air);

13 - lower bottom;

14 - pipe discharge sludge;

15 - reflector;

16 - pipe outlet of purified water;

17 - pipe outlet foam;

18 - a partition;

19 - dividers.

The flotation hydrocyclone is a cylindrical body 1 with an upper bottom 6 and a lower bottom 13. Inside the body 1 there is a central chamber, the side walls of which represent a filter wall 2. In the upper part of the central chamber there is a foam collecting chamber 7, and in the lower part there is a flotation chamber 11 . In the upper part of the housing 1 there is a pipe for supplying source water 9, which is installed tangentially to the housing. In the cross section of the tangential inlet of the pipe 9, a movable ring 5 is installed on the central chamber, on which there are blades 4. A spiral scraper 3 is attached to the movable ring 5, adjacent to the filter screen 2. The flotation chamber 11 located in the lower part of the central chamber is movable, with the possibility of rotation around a vertical axis. The flotation chamber 11 is a conical structure, on a conical surface 10 of which perforations are made, directed tangentially to the surface in a radial plane (see Fig. 5).

The foam collection chamber 7, located on the upper bottom 6, is a cylindrical container in which there is a tangentially mounted nozzle for the removal of foam 17 and a nozzle for supplying air 8 for blowing the foam. At the entrance of the pipe 8 at the entrance to the chamber 7 there is a confuser section with dividers 19. For the formation of blown foam in the chamber 7 there is a radial partition 18. The lower bottom 13 is conical in shape. In the center of it there is a branch pipe for the discharge of sludge 14. The outlet is cleaned through the pipe 16 through the lower part of the chamber 2, and in front of the intake hole there is an inclined reflector 15. The flotation hydrocyclone works as follows. The source of contaminated water is supplied under pressure through the pipe 9 and due to the tangential arrangement acquires rotational movements inside the housing 1. Due to the resulting centrifugal force, large suspended solids are discarded to the wall of the housing 1 and slide into the lower part of the housing 1 to the bottom of the sludge 13 and are removed through the nozzle 14. The middle particles of pollutants are retained on the filter screen 2 and, during operation, can form a layer of sludge on the wall that prevents the flow of liquid. Continuous removal of the sludge layer from the mesh 2 is carried out by a spiral scraper 3, which rotates together with the movable ring 5, on which the blades 4 acquire rotation from the oncoming water flow entering through the pipe 9. The sludge from the mesh 2 is continuously cleaned and discharged into the conical bottom 13, then through the pipe 14 is discharged into the sludge collector. Water purified from large and medium particles of pollutants enters the space formed by filter mesh 2. Here the flotation process takes place, to which small particles and light fractions (oils, coolants) are exposed, which did not linger on the mesh 2. Flotation is provided by the flotation chamber 11, into which air is supplied under pressure through the pipe 12. The flotation chamber 11 is made movable, with the possibility of rotation around a vertical axis. The rotation occurs due to the reactive force that occurs when air flows through the perforation holes of the cone 10, directed tangentially in the radial plane. The rotation of the flotation chamber 11 provides the most complete penetration of the water flow by the pop-up bubbles. Air bubbles trap all particles of the pollutant, oil, oil products, and in the form of foam enter the foam collection chamber 7. Compressed air is supplied to the chamber 7 through the nozzle 8. The air enters the chamber in the form of a flat jet and passes through a series of dividers 19 and covers the entire space the chamber between the wall and the partition 18, then blows the foam into the pipe 17. Purified water from the pollutants is discharged through the pipe 16 to the consumer. To prevent flotation bubbles from entering the pipe 16, an inclined reflective partition 15 is installed in front of it.

Thus, the proposed device can improve the reliability of the apparatus by eliminating the siltation of the filter mesh and increases the performance of the cleaning process due to the continuous regeneration of the filter element.

Claims (4)

1. A flotation hydrocyclone containing a cylindrical body, a centrifugal separation chamber with a tangential nozzle for supplying purified water, a flotation chamber with an air supply manifold and mesh filter walls, a slurry branch pipe and a foam branch pipe, characterized in that the tangential section is in the upper part of the flotation chamber the water supply has a movable ring on which the blades and a scraper are located adjacent to the filter screen, and a flotation foam collection chamber is installed above the upper bottom. 2. The flotation hydrocyclone according to claim 1, characterized in that the flotation foam collection chamber has a radial baffle, a foam outlet pipe located tangentially, and a foam blowdown pipe with guide dividers. 3. The flotation hydrocyclone according to claim 1, characterized in that the air supply manifold in the flotation chamber is made in the form of a movable drum with a system of tangential openings. 4. The flotation hydrocyclone according to claim 1, characterized in that a reflective inclined visor is installed in front of the purified water outlet.

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