RU2286827C1 - Vertical settler for washing water - Google Patents

Abstract

FIELD: separation.

SUBSTANCE: vertical settler comprises discharging pipes (7) connected to the top outlet funnel (6) of cyclone (3) for peripheral zonal additional supplying of initial water near the wall of conical bottom (2) of housing (1) under the layer of water to be settled. Pipes (16) with openings (17) for additional discharging the clarified water are arranged under the water surface. One end of each pipe is connected with chute for the clarified water and has control valve gate (18). The other end is bent downward and has trancated cone (19) at the entrance to the pipe for the clarified water. The outlets of the pipes for discharging clarified water from the top funnel of the cyclone are provided with control gate valves (8), and outlets of the pipes are provided with hemi-cones (9) for zonal distribution of the initial water and reducing the velocity of rising water flow.

EFFECT: enhanced efficiency and reduced metal consumption for manufacturing the settler.

1 cl, 7 dwg

Description

The invention relates to a device for clarifying water, mainly conveyor washing water, and can be used in food, chemical and other industries.

Well-known sedimentation tanks, see "Equipment, structures, the basics of the design of chemical-technological processes for protecting the biosphere from industrial emissions", M., "Chemistry", 1985, section 6.3; Sugar Industry Magazine, No. 5, 1976 p. 53; "Technique of environmental protection", M., "Chemistry", 1981, p. 144; A.S. SU 1005828 A - filter sump, copyright certificate SU 488789 A, publ. 10/25/1975 on 5 pages

The closest to the invention in purpose and technical essence is a vertical sump (a.s. SU 488789), containing a cylindrical-conical body with a cyclone located in the center, with a source water supply pipe, with an upper outlet bell and a separation shell around the cyclone, a scraper foam spreader type with a foam drain box, a clarified water chute located in the upper peripheral part of the body, with a pipe for removing clarified water from the chute, a siphon with a conical nozzle for draining sediment (carried out by practice) nozzles for final draining.

The body of the sump with a cyclone is intended for clarification from suspensions of conveyor washing water.

The foam spreader rakes the foam from the surface of the inner part of the sump and dumps it into a special estrus and is removed from the sump by the box. The siphon with a conical nozzle serves to drain water with sediment and adjust the amount of sediment to be discharged using interchangeable nozzles.

The clarified water chute is located in the peripheral upper zone of the casing and serves to collect and divert clarified water from the sump to production.

Stairs and platforms are designed for easy maintenance.

Pure water is supplied to the siphon communication and to the lower conical part of the sump casing for flushing any part of the siphon and the lower conical part of the casing.

The source water tangentially flows through the pipe into a cyclone, in which the stream of source water is divided into two streams:

- with large heavy particles, suspensions, the first stream is directed down the axis of the sump, and then under the layer of water in the sump;

- pre-clarified water is directed upward and through the upper bell of the cyclone is lowered in the annular space between the cyclone and the separation shell under the layer of clarified water in the center of the sump, and the water from the center is distributed in an oblique direction upwards to the periphery of the casing uniformly. But the flow of initial water does not reach 30-60% to the wall of the cone in the horizontal plane under the settling layer of water.

Water from the center rises upward in an oblique direction to the gutter, being clarified, overflows through the spillways of the gutter and collects in it, and then is discharged from the sump. In this case, the collection of clarified water occurs from the peripheral part of the surface of the sump, i.e. with 40-50% of the surface.

The sediment together with water is removed from the sump through a siphon with a conical nozzle.

Foam scraper scrapers scoop up foam and light fine impurities from the surface of the sump and dump it into the foam collector, and then the foam is removed from the sump.

The disadvantages of the known sump is:

- uneven distribution of the source water under the settling layer of water, i.e. there are unused “dead zones”, especially in the peripheral part of the section of the sump;

- uneven collection of clarified water from the surface of the water in the sump, i.e. there are unused “dead zones”, especially in the central part;

- the full height of the settling layer of water is not used as an additional filter layer;

- large specific metal consumption.

The purpose of the invention is the intensification of the process of clarification (sedimentation) of water, reducing specific metal consumption. This is achieved by the fact that the sump is equipped with downpipes from the upper outlet of the cyclone for peripheral zonal additional input of source water at the wall of the conical bottom of the housing under the layer of settling water, and for additional drainage of clarified water from the upper central part of the sump, radial pipes are located under the water level in the sump with holes, moreover, one end of each pipe is connected to the gutter of clarified water and has an adjustment gate, and the other end is bent down and has a truncated cone n Clarified water inlet pipe.

The outlet pipes from the upper bell of the cyclone at the inlet have adjusting gates, and at the outlet there are distribution half-cones for zonal uniform distribution of the source water and reduce the speed of the upward flow of water.

Figure 1 schematically shows a section of the sump; figure 2 is a section aa of figure 1; figure 3 section GG figure 2; figure 4 - place In figure 1; figure 5 is a section DD DD figure 3; figure 6 - place B of figure 1; Fig.7 is a view E of Fig.6.

The vertical sump for conveyor washing waters has a cylindrical body 1 with a conical bottom 2 and a cyclone 3 with a pipe 4 for supplying water located in the center. Around the cyclone 3, a dividing shell 5 is installed, and the upper outlet of the cyclone is made in the form of an upper bell 6.

The sump is equipped with branch pipes 7 from the upper outlet of the cyclone for peripheral zonal additional input of source water at the wall of the conical bottom of the housing under the layer of settling water.

The outlet pipes from the inlet of the cyclone at the inlet have adjusting gates 8, and at the outlet of the outlet pipes there are distribution half cones 9 for zonal uniform distribution of the source water and reducing the speed of the upward flow of water.

The lower outlet of the cyclone is made in the form of a socket 10 with a chipper 11.

In the upper part of the casing there is an annular chute 12 for collecting clarified water with adjusting triangular weirs 13, with a thin wall and a pipe 14 for water to exit the sump.

An annular dividing sheet 15 is installed in front of the gutter.

For additional drainage of clarified water from the upper central part of the sump, radial pipes 16 with holes 17 are located under the water level in the sump, with one end of each pipe connected to the chute and has an adjustment gate 18, and the other end of each pipe is bent down and has a truncated cone 19 on the entrance of clarified water into the pipe.

A foam spreader 20 with scrapers 21 and a drive 22 is installed above the “mirror” of water.

At the level of the “mirror” of water there is a radially located foam collector 23 with a pipe 24 for removing foam and the smallest light impurities from the sump.

On the lower pipe 25 of the conical bottom there is a siphon 26 with valves and with a conical nozzle 27 for withdrawing sediment from the sump.

In the lower part of the cone there is a device 28 for washing the sediment and a hatch 29, a pipe 30 with a valve for the final discharge of sediment, water.

The sump vertical for conveyor washing water works as follows.

Water to be purified (clarified) enters through a pipe 4 into a cyclone 3, in which it is divided into two fractions.

Most of the water without large mechanical impurities is directed upward in the center and in the upper outlet 6, the water is divided into two streams. The main part is poured through the upper part of the socket 6 and is directed downward in the annular space between the cyclone 3 and with the separation shell 5.

Then, the flow of water goes around the lower edge of the shell 5 and is directed upward into the space between the shell 6 and the wall of the housing 1. When the water is rotated 180 °, large heavy particles are sent down to the conical part 2 of the housing 1, and the main part of the water enters the settling zone under the settling layer water in the central part of the housing, while the flow rate of water decreases to the deposition rate.

The second part of the water from the upper outlet 6 is directed through the discharge pipes 7 with gates 8 to the periphery of the conical bottom under the filter layer of water to the half cone 9, and the source water is distributed zonally in the horizontal and volume directions, while the flow rate decreases to the deposition rate and peripheral is used part of the area under the settling layer of water.

A smaller part of the water with large heavy mechanical impurities is directed downward in the cyclone 3, through the bell 10 and, with the help of a cone chipper 11, is distributed evenly under the settling layer of water. In this case, heavy particles settle down into the cone 2.

Thus, the source water is distributed in the lower part evenly over the entire cross section of the casing and rises upward at a speed less than or equal to the deposition rate through the settling water layer. When rising, the water clarifies (settles). In addition to settling in a vertical stream, filtration of the source water through a layer of deposited particles is also carried out. In this case, the effect of water purification increases.

Heavy impurities are deposited down into the conical part 2 of the housing 1, and the clarified water rises and through the height-adjustable spillways 13 enters the annular groove 12. In this case, the clarified water is collected only from the peripheral part of the water surface.

In addition, with the help of radial pipes 16 through the holes 17 and with the use of truncated cones 19, the clarified water is collected from the central part of the upper layer of water in the sump and is also sent to the annular groove 12. From the annular groove 12, the clarified water is discharged from the sump through the pipe 14 and returned into production. Thus, the distribution of the source water under the entire layer of settling water and the collection of clarified water from the entire surface of the water in the sump occurs.

The intensity of the source and clarified water flows is regulated by gates 8, weirs 13, gates 18.

Light impurities and foam collect on the surface of the “mirror” of water, between the annular dividing shield 15 and the dividing shell 5.

Using scraper 21 of the foam spreader 20, the smallest light impurities and foam are collected from the surface of the water mirror and discharged into the foam collector 23, and then through the pipe 24 are removed from the sump.

The precipitate is lowered into the conical bottom 2 and through the pipe 25, siphon 26, the conical nozzle 27 is removed from the sump.

By replacing the nozzle 27 (different diameters), the moisture content of the sediment can be controlled.

With a strong compaction of sediment in cone 2, a device for washing the precipitate is used. Hatch 29 is used for inspection and repair.

The final discharge of water from the sump is carried out through the pipe 30.

In the upper bell 6 of the cyclone 3 and when the water overflows from the bell into the space between the cyclone 3 and the separation shell 5, air is released from the source water, which helps to improve the conditions of water sedimentation.

The feed water in the sump is filtered along with sedimentation through a layer of suspended sediment.

The proposed vertical settling tank for conveyor washing waters will allow:

- increase the capacity of the sump by 1.3-1.5 times;

- reduce specific metal consumption, i.e. the relative weight of the sump per 1 m ^{3 of} purified water per hour (for example, the existing sump weight is 50 tons, and the capacity for treated water is 525 m ³ / h, and for the proposed sump it is 51 tons of sump weight, the capacity will be 800 m ³ / h); thus, the specific metal consumption will decrease from 0.1 t / m ³ to 0.064 t / m ³ ;

- the lightening effect will increase from 70% to 80%.

Claims (2)

1. Vertical sump for conveyor washing waters, including a cylindrical body with a conical bottom, a cyclone with an upper outlet bell and a separating shell, a scraper-type foam spreader, a siphon with a conical nozzle, a clarified water chute and pipe, pipes for the discharge of clarified water, foam and light impurities, sediment from the sump, characterized in that it is equipped with outlet pipes from the upper outlet of the cyclone for peripheral zonal additional input of source water at the wall of the conical bottom of the core radial pipes with holes for the additional drainage of clarified water from the upper central part of the sump under the water level in the sump, with one end of each pipe connected to the gutter of the clarified water and has an adjustment gate, and the other end of each pipe bent down and has a truncated cone at the entrance of clarified water into the pipe. 2. The vertical sump for conveyor washing water according to claim 1, characterized in that the outlet pipes from the upper bell of the cyclone have adjusting dampers at the inlet, and distribution half-cones are located at the outlet for zonal uniform distribution of the source water and reducing the speed of the upward flow of water.

Images