RU2557573C1 - Cover for radial settler - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: cover is made composite out of central, middle and peripheral rings. The central ring is fixed on the central support of the settler, the peripheral ring is fixed on the peripheral part of the settler bowl, and middle ring floats on the water surface, and is made with possibility of the concentric rotation relatively to the central and peripheral rings together with movables girder of the sludge scraper. The middle ring is made with break under movable girder of the sludge scraper, in which the cover sector is suspended using the brackets under girder.

EFFECT: higher operation reliability of the settler.

30 cl, 21 dwg

Description

The invention relates to the field of ceilings of wastewater treatment plants.

Floating overlap is known (Eurasian patent No. EA 017108). The overlap of the water mirror is made of three rings - central, middle and peripheral. The central and peripheral rings are fixedly mounted respectively on the support tower and the peripheral part of the sump, and the middle ring is mounted on a water mirror and has a connection to the silo scraper farm using columns, which allows the overlap to move together with the farm relative to the central and peripheral rings. Each overlap ring is made prefabricated in the form of sections. The sections of the central and peripheral rings are rigidly connected to each other by bolted connections, and the sections of the middle overlap ring have a movable connection. Each section of the middle overlap ring is made in the form of a series of sealed chambers to ensure positive buoyancy of the middle ring. The lower surface of the floor is smooth, without voids and has constant contact with water. The overlap rings are overlapped relative to each other. The gap between the movable and fixed overlapping rings is closed by a rubber seal in the form of a rubber sheet to prevent the escape of waste water vapor and odors. Such a design of the overlap eliminates the contact of the water mirror with the atmosphere, i.e. ingress of vapors and odors into it, and ensure operability when changing the level of wastewater in the radial sump.

The disadvantage of this overlap is: low quality sealing between floating and fixed sectors; the complexity of the design of the interface of the floating floor with the farm; lack of a mechanism to allow the emptying of the sump in automatic mode; the inability to take water samples without dismantling the ceiling; the inability to drain rainwater from the central and peripheral rings; lack of compaction between floating overlapping sectors; the presence of a large number of welds, violation of the tightness of any of which can lead to flooding of the ceiling; the possibility, despite the smooth surface of the floating part of the overlap, the accumulation of floating substances and objects (fat, paper, small debris) under it, eventually forming a crust.

The technical result, to which the invention is directed, is to increase the reliability of the sump due to:

1) increase the density of compaction between floating and fixed sectors;

2) simplification of the mechanism of transmission of rotational motion from the sludge scraper farm to the floating overlap ring;

3) ensure the emptying of the sump in automatic mode;

4) providing the possibility of sampling water without dismantling the ceiling;

5) providing the possibility of draining rainwater from the central and peripheral overlapping rings;

6) providing a seal between the sectors of the floating overlap ring;

7) ensure buoyancy in case of leakage of welds and, as a result,

8) eliminating the possibility of crust formation under the floating overlap ring.

The technical result is achieved as follows.

The overlap of the water mirror is made of three rings — central, middle (floating) and peripheral. The central ring of the ceiling is fixed, fixed on the central support of the sump and is located 100 ... 300 mm above the water level in the sump. The peripheral ring of overlapping is also fixed, installed on the peripheral part of the bowl of the sump, supported by embedded elements in the sump and the support ring in the area of the overflow tray and is located 100 ... 300 mm above the water level in the sump. Mortgage elements are a profile stainless steel pipe, channel or corner, having a seal in the side of the sump. The support ring is a profile stainless pipe located around the entire circumference of the sump in the area of the overflow tray, having supports in the area of each of the reinforced concrete crossbars of the sump. The middle overlap ring is made with a gap and floats on the surface of the water and in the working position is located 50 ... 250 mm below the level of the central and peripheral overlap rings.

Under the truss silo farm, in the middle ring gap, the overlap sector under the truss (SPF) is suspended using brackets. Each of the brackets consists of two parts - the upper and lower. The upper part of the bracket is made of structural steel and welded to the sludge truss. The lower part of the bracket is made of stainless steel and welded to the SPF. Between themselves, the upper and lower parts of the bracket are connected using a flange connection. SPF is a pipe frame, sheathed with metal sheets on top, has a trapezoidal shape and is made according to the size of the gap in the middle (floating) overlap ring, and its sides have special pipe or corner descents with a length of 500-2000 mm. The omissions are designed to compensate for fluctuations in the working level in the sump and to prevent accidents due to the displacement of the floating overlap ring in the event of a significant decrease in the water level in the sump. The movement is transferred from the sludge scraper farm to the floating overlapping ring by the sides with the downfalls of the SPF.

The gap between the movable and fixed overlapping rings is closed in two ways.

Sealing according to the first embodiment is carried out using strip brushes. Strip brushes consist of a metal profile, into which a cassette with a pile is inserted. Brush pile is made of a material resistant to aggressive wastewater: polyamide, polyvinyl chloride, polypropylene or polyester. The pile diameter is 0.1-1.0 mm. The length of the pile is 30-250 mm to compensate for fluctuations in the water level in the sump. Each of the bristles of the brush is bent in half and strung on a metal wire with a diameter of 0.5-3 mm. A wire with a strung pile is crimped by a metal strip 0.5-1.5 mm thick. Received cassettes are refilled in the profile. The profile can be made of various materials: stainless steel, aluminum, polymer. The profile can have a different shape: H-shaped, h-shaped, U-shaped. The tape brushes are fixed to the fixed peripheral and central sectors of the ceiling using brackets. When the sump works with a sludge scraper and a floating floor under the stationary peripheral and central sectors of the floor, water fog and condensation will form on the bristles of the strip brushes. The formation of condensation on the villi provides additional brush seal density. The presence of a large number of fibers on the tape brush and their flexibility allows them to completely repeat all the bends of obstacles encountered during operation, and to ensure high quality seals.

The sealing according to the second embodiment occurs using sheets of rubber or polymer fabric folded in half along the long side, while the long edges of the sheet are joined together and fixed on the stationary central and peripheral rings in the form of a bubble due to the elasticity of the material. In this case, the fold of the bubble is in contact with the middle overlap ring. Rubber or polymer fabric has a thickness of 0.5-6 mm. The length of the bubble during operation can vary between 30-250 mm to compensate for fluctuations in water level.

The peripheral overlap ring is made of sections having a trapezoidal or rectangular shape. The gap between the sectors, if they are rectangular, is closed by a triangular-shaped sheet metal insert. For additional sealing of the peripheral ring of overlap in the area of the side of the sump, the sectors have a visor in the form of a metal strip coming on board the sump. On the peripheral and central overlap rings, inspection hatches are made in the amount necessary to ensure the technological process for monitoring the quality of wastewater. Inspection hatches are attached to the peripheral sectors of the ceiling using a loop connection and have a rubber seal around the perimeter.

The peripheral overlap ring is made with a slope from the side of the sump to the side of the middle (floating) overlap ring, and the central overlap ring is made with a slope from the central support towards the middle (floating) overlap ring, sufficient to drain rainwater onto the floating overlap ring.

Sectors of the middle (floating) overlap ring are a frame made of stainless profile pipe of rectangular cross section, sheathed on both sides with sheet metal 0.5-1.5 mm thick. The framework of the sectors of the middle overlap ring consists of profile pipes forming a contour around the perimeter, and profile pipe bridges. The presence of jumper pipes creates independent tight zones within each of the sectors of the middle overlap ring. The number of sealed zones can vary from 3 to 50, depending on the diameter of the ceiling. Each of the profile pipes, forming a contour around the perimeter, and jumper pipes are welded with plugs on both sides, so that their tightness is achieved. One section of the middle (floating) overlap ring has at least 20 pipes forming a contour around the perimeter, and jumper pipes, each of which is completely tight. Pipes forming a circuit along the perimeter, and jumper pipes provide zero buoyancy for each of the sections of the middle (floating) overlap ring. Flooding of the overlap can occur if the tightness of 100% of the sealed zones, plus 1 of the pipes forming the frame, or 100% of the pipes forming the frame, and 65% of the sealed zones is violated. Each of the sections of the middle (floating) overlap ring has a 3.5-fold margin of buoyancy. Thus, due to the creation of independent tight zones and the tightness of the profile pipes forming the frame, the reliability of the middle (floating) overlap ring is increased.

Each sector of the middle overlap ring along the entire length of the side has seals in the form of a rubber or polyurethane roller for sealing the joints of the sectors with each other.

When the sump is emptied, winches with an electric motor are fixed on board the sump and on the sludge farm. The cables from the winches are fixed to the eyes on the middle (floating) floor ring. The number of winches varies depending on the diameter of the sump and is at least three. All winches are synchronized with each other, providing, when emptying the sump, the unwinding speed equal to the speed of lowering the water level. Due to the coincidence of the speed of the sump emptying and the speed of unwinding of the winches, the middle (floating) overlap ring is centered to exclude its displacement. The centering of the middle overlap ring when filling the sump with water occurs in a similar way. The winding speed of the winches is set equal to the speed of filling the sump with water. Thus, the centering of the middle (floating) floor ring during emptying and the filling of the sump are carried out in automatic mode.

To intensify the deposition of suspended particles in the sump, a flow quencher is used. The flow damper is a frame made of profile stainless pipe, sheathed on the outside with stainless sheets, mounted on supports and located concentrically to the central support of the sump. The barrier created by the flow damper is H = 0.4-0.75 of the depth of the sump. In this case, the flow quencher protrudes above the water surface by h = 50-150 mm. The intensification of sedimentation of suspended solids is achieved due to the fact that the flow quencher creates a barrier to the flow of water flowing from the central support of the sump. At the same time, the energy of the water flowing from the central support is extinguished and the sedimentation of suspended solids occurs more intensively, significantly improving the efficiency of the sludge scraper installed inside the sump. At the same time, the flow quencher reduces the speed of floating substances (grease, paper, small debris) in the water stream and contributes to their ascent. Due to the fact that the upper edge of the flow absorber protrudes above the surface of the water, a “trap” for floating substances is formed, contributing to their accumulation inside the flow damper and preventing them from floating in the area of the floating overlap ring, solving the problem of fat deposits in the form of a crust under the floating overlap ring. Removal of floating substances from the flow damper occurs periodically through hatches in the central overlap ring.

For additional centering of the middle (floating) floor ring when emptying (filling) the sump, water is designed guides located on the outside of the flow damper along the entire vertical. When emptying or filling the sump, the floating overlapping ring behind the eyes is connected to guides located not on the outside of the flow damper using cables. The cables have the ability to slide along the guides of the flow damper, allowing the floating ring of the floor to lower / rise along with the water level. In this case, the cables center and do not allow the floating overlap ring to move relative to their working position. The number of guides on the flow damper can vary depending on the diameter of the sump and is at least four.

The above shows that the combination of the claimed features ensures the achievement of the goals.

Figure 1 shows a General view of a radial sump with a sludge scraper;

Figure 2 shows a General view of the radial sump with overlap;

Figure 3 shows the side of the radial sump with a mortgage element and a sector of the peripheral overlap ring;

Figure 4 shows the tray part of the sump with a crossbar with a support and a sector of the peripheral overlap ring;

Figure 5 shows a General view of the SPF;

Figure 6 shows a method of attaching SPF to a sludge scraper farm;

7 shows a method of sealing the gap between the movable and fixed overlapping rings using strip brushes;

On Fig, 9 shows a General view of a strip brush;

Figure 10 shows options for the profile of a strip brush;

11 shows a method of sealing the gap between the movable and fixed overlapping rings using a sheet of rubber or polymer fabric;

On Fig shows options for the shape of the sectors of the peripheral ring overlap;

On Fig shows a General view of the sector of the peripheral overlap ring with the inspection hatch;

On Fig shows a General view of the sector of the Central ring overlap with a viewing hatch;

On Fig shows a General view of the inspection hatch;

On Fig shows a General view of the sector of the middle overlap ring;

On Fig shows a section aa in Fig.16;

On Fig shows a General view of the radial sump with overlap and winches;

On Fig shows a General view of the flow damper with guides;

On Fig shows a flow quencher with a sump filled with water;

On Fig shows a General view of the radial sump with a flow quencher (the central overlap ring is not conventionally shown).

The radial sump is a tank 1 with a central support 2, side 3 and overflow tray 4, supported by reinforced concrete crossbars 5 located around the entire circumference of the sump. Inside the sump, a flow damper 6, a sludge scraper 7, having a system of scrapers 8 and a triangular truss 9 is installed. In the working state, the sump 1 is filled with water. To exclude fumes from the water surface, it is closed by a ceiling 10.

The overlap 10 of the water mirror is made up of three rings — the central 11, the middle (floating) 12 and the peripheral 13. The rings 11, 12 and 13 are arranged concentrically to each other.

The central overlap ring 11 is fixed, fixed to the central support 2 of the settler 1. The peripheral overlap ring 13 is also fixed and mounted on the peripheral part of the settler bowl with support on the embedded elements 14 in the side of the settler 3 and the support ring 15 in the area of the overflow tray. The support ring 15 has supports 16 in the area of each of the reinforced concrete crossbars 5 of the sump. The middle overlap ring 12 floats on the surface of the water.

Under the truss 9 of the scrubber 7, the overlap sector under the truss 18 is suspended using brackets 17. Each of the brackets 17 consists of two parts - the upper 19 and the bottom 20. The upper part 19 of the bracket is made of structural steel and welded to the truss 9 of the scraper. The lower part of the bracket 20 is made of stainless steel and is welded to the floor sector under the truss 18. The upper 19 and lower 20 parts of the bracket 17 are connected to each other by means of a flange connection 21. The sides 22 of the floor sector under the truss 18 have special drops 23 from pipes or corners . The movement is transmitted from the silo scraper farm 9 to the middle overlap ring 12 by the sides 22 with the slopes 23 of the overlap sector under the truss 18.

The gap between the movable middle ring 12 and the stationary central 11 and peripheral 13 overlap rings is closed by two variants of execution.

The sealing according to the first embodiment is carried out using strip brushes 24. Strip brushes 24 consist of a metal profile 25, into which a cartridge is inserted in the form of a crimp strip 26 with a pile 27. Each of the bristles is bent in half and strung on a metal wire 28 with a diameter of 0.5 ... 3 mm. The wire 28 with a strung pile 27 is crimped by a metal strip 26. The resulting cassettes are tucked into profile 25. Profile 25 can have a different shape: H-shaped, h-shaped, U-shaped. The strip brushes 24 are fixed to the fixed peripheral 13 and central 11 overlap rings.

The sealing according to the second embodiment is carried out using a sheet of rubber or polymer fabric fixed on the stationary central 11 and peripheral 13 rings in the form of a bubble 29. In this case, the lower part of the bubble 30 is in contact with the middle ring 12 of the overlap, and the upper part 31 is fixed to the stationary central 11 and peripheral 13 rings.

The peripheral overlap ring 13 consists of sections having a trapezoidal 32 or rectangular 33 shape. The gap between the rectangular sectors is closed by a triangular-shaped sheet metal insert 34. For additional tightness of overlap, each of the sectors of the peripheral ring 13 in the region of the bead 3 of the sump has a visor 35 in the form of a metal strip coming on board 3 of the sump. Inspection hatches 36 are located on the sectors of the peripheral 13 and central 11 overlap rings. Inspection hatches 36 are attached to the overlap sectors using a loop connection 37 and have a rubber seal 38 around the perimeter.

The sectors of the middle overlap ring 12 are a frame from a profile pipe 39, sheathed on both sides with sheet metal 40. The sectors of the middle ring of overlap along the entire length have seals in the form of a rubber or polyurethane roller 41. The frame 39 of the floating sectors of the overlap consists of profile pipes forming a contour along the perimeter 42 and profile jumper pipes 43. The presence of jumper pipes creates independent tight zones 44 inside each of the sectors of the middle overlap ring. Each of the profile pipes forming a contour along imetru 39 and jumper-shaped pipe 40 is also made airtight.

When the sump is emptied, winches 45 with an electric motor are fixed on board 3 of the sump and on the farm 9 of the sludge scraper. The cables 46 from the winches are fixed to the eyes 47 on the floating ring of the ceiling.

To intensify the deposition of suspended particles in the sump, a flow damper 6 is used. The flow damper 6 is a frame 48 made of stainless steel profile, sheathed on the outside with stainless steel sheets 49, mounted on supports 50 and located concentrically to the central support 2 of the sump. The barrier created by the flow damper is H = 0.4-0.75 of the depth of the sump. In this case, the flow quencher protrudes above the water surface by a value of h = 50-150 mm. Removal of floating substances from the flow quencher 6 occurs periodically through hatches 36 of the central 11 ring of overlap.

For additional centering of the middle (floating) overlap ring when emptying (filling) the sump with water, guides 51 are located on the outer side of the flow damper 6. When emptying (filling) the sump, the floating overlap ring 12 behind the eyes 47 is connected to the guides 51 located on the outside the flow damper 6 using cables 52. The cables 52 have the ability to slide along the guides 51 of the flow damper 6, allowing the floating overlap ring 12 to lower / rise along with its water. While the cables 52 are centered and do not allow the floating ring 12 overlap to move relative to its working position.

Claims (30)

1. Overlap of the radial sump, made of composite of the Central, middle and peripheral rings, while the Central ring is fixed to the Central support of the sump, the peripheral ring is fixed to the peripheral part of the bowl of the sump, and the middle ring floats on the surface of the water and is made with the possibility of concentric rotation relative to the central and peripheral rings together with the movable silt farm, characterized in that the middle ring is made with a gap under the movable silt farm a reba in which, using brackets, the sector of overlap under the truss (SPF) is suspended. 2. The overlap according to claim 1, characterized in that the SPF is made in a trapezoidal shape in the form of a frame of pipes, sheathed on top with metal sheets. 3. The overlap according to claim 1, characterized in that the sides of the overlapping sector under the truss have downs from pipes or a corner with a length of 500-2000 mm 4. The overlap according to claim 1, characterized in that the transmission of movement from the sludge scraper farm to the middle overlap ring is carried out by the sides with the descents of the overlap sector under the truss. 5. The overlap according to claim 1, characterized in that the gap between the middle and the fixed overlapping rings is closed using strip brushes mounted on the fixed central and peripheral rings. 6. The overlap according to claim 1, characterized in that the gap between the middle and fixed overlapping rings is closed by bending in half along the long side of the sheets of rubber or polymer fabric, while the long edges of the sheet are connected together and fixed to the stationary central and peripheral rings in the form bubble due to the elasticity of the material, and the fold of the bubble is in contact with the middle annulus of overlap. 7. The overlap according to claim 5, characterized in that the strip brushes consist of a metal profile, into which a cassette with a pile of material resistant to aggressive wastewater is inserted: polyamide, polyvinyl chloride, polypropylene or polyester. 8. The overlap according to claim 7, characterized in that the diameter of the pile is 0.1-1.0 mm, the length of the pile is 30-250 mm. 9. The overlap according to claim 7, characterized in that the profile can be made of various materials: stainless steel, aluminum, polymer. 10. The overlap according to claim 7, characterized in that the profile can be made H-shaped, h-shaped or U-shaped. 11. The overlap according to claim 6, characterized in that the seal of rubber or polymer fabric has a thickness of 0.5-6 mm 12. The overlap according to claim 6, characterized in that the length of the bubble is 30-250 mm 13. The overlap according to claim 1, characterized in that the peripheral overlap ring consists of sections having a trapezoidal or rectangular shape. 14. The overlap of claim 13, wherein the gap between the rectangular sectors is closed by a triangular-shaped sheet metal insert. 15. The overlap of claim 13, wherein the sectors of the peripheral overlap ring in the side region have a visor in the form of a metal strip. 16. The overlap according to claim 1, characterized in that on the peripheral and central rings are inspection hatches in the amount necessary to ensure the technological process for monitoring the quality of wastewater. 17. The overlap according to claim 16, characterized in that the inspection hatches are attached to the peripheral sectors of the overlap using a loop connection and have a rubber seal around the perimeter to ensure tightness. 18. The overlap according to claim 1, characterized in that the peripheral and central overlap rings are inclined, respectively, from the side and from the central support towards the middle overlap ring, sufficient to drain rainwater. 19. The overlap according to claim 1, characterized in that the middle overlap ring is made of sectors. 20. The overlap according to claim 19, characterized in that the sector of the middle overlap ring is made in the form of a frame from a profile pipe sheathed on both sides with sheet metal 0.5-1.5 mm thick. 21. The overlap according to claim 20, characterized in that the framework of the sectors of the middle overlap ring consists of profiled pipes forming a contour along the perimeter and / or profiled jumper pipes, while at least one of the pipes is sealed. 22. The overlap according to claim 19, characterized in that each sector of the middle overlap ring along the entire length of the side has seals in the form of a rubber or polyurethane roller. 23. The overlap according to claim 1, characterized in that at least one winch with an electric motor is fixed on board the sump and / or on the sludge farm. 24. The overlap according to item 23, wherein the number of winches varies depending on the diameter of the sump. 25. The overlap according to item 23, wherein the speeds of unwinding and winding the winch cables are synchronized with each other and coincide with the speed of emptying or filling the sump with water. 26. The overlap according to claim 1, characterized in that a flow damper is installed concentrically around the central support, which is a frame made of profile stainless pipe, sheathed on the outside with stainless sheets and mounted on the supports. 27. The overlap according to claim 26, characterized in that the height of the flow damper frame sheathed with stainless sheets is 0.4-0.75 of the depth of the sump. 28. The overlap according to p. 26, characterized in that the flow damper protrudes above the water surface by 50-150 mm 29. The overlap according to claim 26, characterized in that on the outer edges of the flow damper there are vertically guides for additional centering of the middle overlap ring when emptying or filling the sump with water. 30. The overlap according to clause 29, wherein the number of guides on the flow damper may vary depending on the diameter of the sump.

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