A desulfurization wastewater sedimentation device

Abstract

This utility model relates to the field of environmental wastewater treatment and discloses a desulfurization wastewater sedimentation device. The key technical features include: a flocculation tank, a wastewater inlet mechanism, a flocculant addition mechanism, and a mixing mechanism. The wastewater inlet mechanism includes an inlet pipe, an inclined guide plate, and a vertical guide plate. The inlet pipe is positioned at the edge of the flocculation tank opening, and the inclined guide plate is connected to the outlet of the inlet pipe. The top of the vertical guide plate is installed at the bottom of the inclined guide plate. The flocculant addition mechanism includes a mixing tank, which is installed above the inclined guide plate and is used to dissolve the flocculant. The mixing mechanism includes a mounting plate, a drive motor, a stirring shaft, and stirring blades. The two ends of the mounting plate are respectively installed on the two opposite edges of the flocculation tank opening. A coupling is provided on the mounting plate, and the top of the stirring shaft is connected to the rotor end of the drive motor via the coupling. The stirring blades are installed on the outer side of the stirring shaft.

Description

Technical Field

[0001] This utility model relates to the field of environmental wastewater treatment, and more specifically, it relates to a desulfurization wastewater sedimentation device. Background Technology

[0002] In the production processes of power and chemical enterprises, wet desulfurization processes are typically used to control emissions of acidic gases such as sulfur dioxide. However, this process generates a large amount of desulfurization wastewater, which has a complex composition and contains high concentrations of suspended solids (such as gypsum particles), heavy metal ions (such as mercury, lead, cadmium, etc.), chlorides, sulfates, and other pollutants. Direct discharge of this wastewater would cause serious damage to the ecological environment, including water bodies and soil, and would also fail to meet national environmental emission standards.

[0003] Currently, the most commonly used method for treating desulfurization wastewater in the industry is flocculation sedimentation, which involves adding flocculants to the wastewater to cause pollutant particles to aggregate into flocs, which are then removed through sedimentation. However, existing desulfurization wastewater sedimentation devices have the following problems: When wastewater is introduced, it can easily cause impact, leading to turbulent water flow in the flocculation tank. This not only damages the already formed flocs but also reduces the mixing efficiency of pollutants and flocculants. Flocculants are mostly in solid powder form. If they are added directly to wastewater, they are prone to insufficient dissolution and uneven dispersion, resulting in poor flocculation effect and "over-dosing" or "under-dosing" in some areas. The stirring mechanism is not stable enough, and local eddies are easily generated during the stirring process, resulting in uneven mixing of wastewater in the pool and affecting floc formation and sedimentation efficiency. The flocculation reaction zone and the sedimentation zone are not effectively isolated. The flocs are easily disturbed by the water flow during the sedimentation process, which reduces the sedimentation and separation effect and ultimately leads to unstable effluent quality.

[0004] Therefore, it is necessary to design a desulfurization wastewater sedimentation device with a reasonable structure, high mixing efficiency, and stable sedimentation effect. Utility Model Content

[0005] The purpose of this invention is to provide a desulfurization wastewater sedimentation device, which optimizes the wastewater inlet structure, flocculant dissolution and addition structure, and stirring and sedimentation structure to achieve efficient mixing, full reaction, and stable sedimentation of desulfurization wastewater and flocculant.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a desulfurization wastewater sedimentation device, comprising: a flocculation tank, a wastewater inlet mechanism, a flocculant addition mechanism, and a mixing mechanism. The wastewater inlet mechanism includes an inlet pipe, an inclined guide plate, and a vertical guide plate. The inlet pipe is installed at the edge of the flocculation tank opening. The inclined guide plate is connected to the outlet of the inlet pipe. The bottom end of the inclined guide plate is inclined towards the tank wall of the flocculation tank. The top end of the vertical guide plate is installed at the bottom end of the inclined guide plate. A water passage gap is provided between the bottom end of the vertical guide plate and the bottom of the flocculation tank. The flocculant addition mechanism includes a mixing tank, which is installed above the inclined guide plate. The mixing tank is used to dissolve the flocculant and discharge the treated flocculant through the discharge pipe at the bottom of the mixing tank. The mixing mechanism includes a mounting plate, a drive motor, a stirring shaft, and stirring blades. The two ends of the mounting plate are respectively installed on the two opposite edges of the flocculation tank. A coupling is provided on the mounting plate. The top end of the stirring shaft is connected to the rotor end of the drive motor through the coupling. The stator of the drive motor is fixedly connected to the top surface of the mounting plate. The stirring blades are installed on the outside of the shaft of the stirring shaft.

[0007] As a preferred embodiment of this utility model, the wastewater inlet mechanism includes a top support plate, two side support plates, and two side flow-blocking plates; one end of the top support plate is fixedly connected to the top of the inclined guide plate, and the other end of the top support plate is positioned above the inlet pipe; the top edges of the two side support plates are respectively fixedly and perpendicularly connected to the two sides of the top support plate; the bottom edges of the side support plates are positioned outside the inlet of the flocculation tank; one side of the side flow-blocking plate is respectively perpendicularly connected to the side of the vertical guide plate and the side of the inclined guide plate, and the other side of the side flow-blocking plate is attached to the inner wall of the flocculation tank.

[0008] As a preferred technical solution of this utility model, a receiving plate is connected between the bottom surface of the inclined guide plate and the middle part of the mounting plate. The mixing tank is installed on the top of the top support plate. The top support plate is provided with a leakage hole at a position directly above the inclined guide plate. The bottom discharge pipe of the mixing tank is located inside the leakage hole.

[0009] As a preferred embodiment of this utility model, the mixing tank is equipped with a mounting base, the mounting base including a support ring and several support legs, the support ring being fixedly connected to the bottom of the mixing tank, the top end of the support leg being fixedly connected to the support ring, and the bottom end of the support leg being fixedly connected to the top surface of the top support plate.

[0010] As a preferred embodiment of this utility model, the top of the mixing tank is equipped with a feed funnel and a water pipe. The feed funnel is used to add solid flocculant into the mixing tank, and the water pipe is used to introduce water into the mixing tank. The mixing tank is equipped with a stirring mechanism for stirring and dissolving the solid flocculant.

[0011] As a preferred technical solution of this utility model, the stirring blade is based on the principle that one end of the stirring shaft has an arc-shaped edge.

[0012] As a preferred embodiment of the present invention, the mixing mechanism is further provided with a positioning seat, which is fixedly connected to the bottom of the flocculation tank. The top of the positioning seat is provided with a recessed positioning groove, and a rotating bearing is disposed in the positioning groove. The bottom end of the stirring shaft is fixedly connected to the inner ring of the rotating bearing.

[0013] As a preferred embodiment of this utility model, the flocculation tank is provided with a partition plate, and the wastewater inlet mechanism, the flocculant addition mechanism, and the mixing mechanism are all located on one side of the partition plate.

[0014] In summary, this utility model has the following beneficial effects: The inclined and vertical guide plates of the wastewater inlet mechanism reduce the impact speed of the wastewater and allow the flocculant solution to be initially mixed during the wastewater flow. Combined with the multiple sets of arc-shaped stirring blades of the mixing mechanism, the wastewater and flocculant are fully mixed, avoiding the problem of uneven mixing in certain areas and improving the flocculation reaction efficiency. The partition plate divides the flocculation tank into a reaction zone and a sedimentation zone. The stirring in the reaction zone has little impact on the stability of the water flow in the sedimentation zone under the condition of continuous water supply. The flocs can settle stably in the sedimentation zone, which effectively improves the removal rate of pollutants and ensures that the effluent water quality meets the standards. All components of the device adopt a modular design, making installation and disassembly convenient; the mixing tank's stirring mechanism, feeding and water circulation structure can realize the automated dissolution and dosing of flocculants, reducing manual operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the desulfurization wastewater sedimentation device; Figure 2 This is a schematic diagram of a partial structure of the hybrid mechanism; Figure 3 This is a partial structural diagram of the flocculant addition mechanism; Figure 4 This is a partial structural diagram of the wastewater inlet mechanism.

[0016] In the diagram: 1. Flocculation tank; 2. Inlet pipe; 3. Inclined guide plate; 4. Vertical guide plate; 5. Water passage gap; 6. Mixing tank; 7. Mounting plate; 8. Drive motor; 9. Stirring shaft; 10. Stirring blade; 11. Top support plate; 12. Side support plate; 13. Side flow baffle plate; 14. Receiving plate; 15. Support ring; 16. Support leg; 17. Feed funnel; 18. Water pipe; 19. Stirring mechanism; 20. Arc edge; 21. Positioning seat; 22. Isolation plate. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0018] like Figure 1 As shown, this utility model provides a desulfurization wastewater sedimentation device, including: a flocculation tank 1, a wastewater inlet mechanism, a flocculant addition mechanism, and a mixing mechanism; Flocculation tank 1 is a rectangular tank with an open top. The tank body is made of corrosion-resistant material, with a smooth inner wall and an anti-corrosion coating to prevent wastewater from corroding the tank body. A sludge discharge pipe is installed at the bottom of the tank body, and an electric valve is installed on the sludge discharge pipe to periodically discharge the settled sludge. A water outlet pipe is installed at the bottom of one side of the tank body, and a filter screen is installed on the water outlet pipe to prevent unsettled flocs from being discharged with the water.

[0019] like Figure 4 As shown, the wastewater inlet mechanism includes an inlet pipe 2, an inclined guide plate 3, a vertical guide plate 4, a top support plate 11, two side support plates 12, and two side flow-blocking plates 13. The inlet pipe 2 is installed at the edge of the flocculation tank 1. A flow regulating valve is provided at the end of the inlet pipe 2 to control the wastewater inlet flow rate.

[0020] The inclined guide plate 3 is attached to the outlet of the inlet pipe 2. The bottom end of the inclined guide plate 3 is inclined towards the wall of the flocculation tank 1. The angle between the inclined guide plate 3 and the horizontal direction is 30°-45°, which is used to guide the wastewater to flow smoothly.

[0021] The top of the vertical guide plate 4 is installed at the bottom of the inclined guide plate 3. A water passage gap 5 is provided between the bottom of the vertical guide plate 4 and the bottom of the flocculation tank 1 to ensure that the wastewater slowly enters the bottom of the flocculation tank 1 and avoids impacting the water in the tank.

[0022] One end of the top support plate 11 is fixedly welded to the top of the inclined guide plate 3. One end of the top support plate 11 is erected above the water inlet pipe 2. The top support plate 11 is used to support the flocculant addition mechanism.

[0023] The top edges of the two side support plates 12 are respectively vertically fixed to the two sides of the top support plate 11. The bottom edges of the side support plates 12 are laid outside the pool opening of the flocculation tank 1 and fixed to the edge of the pool opening by bolts, thereby enhancing the overall stability of the wastewater inlet mechanism. One side of the side baffle 13 is perpendicularly connected to the side of the vertical guide plate 4 and the side of the inclined guide plate 3, respectively. The other side of the side baffle 13 is attached to the inner wall of the flocculation tank 1. The side baffle 13 can prevent wastewater from overflowing from the gap between the inclined guide plate 3 and the tank wall, and at the same time avoid water flow disturbing other areas in the tank.

[0024] like Figure 3 As shown, the flocculant addition mechanism includes a mixing tank 6, a mounting base, a feed funnel 17, a water pipe 18, and a stirring mechanism 19. The mixing tank 6 is a cylindrical tank with a sealing cover at the top and a discharge pipe at the bottom. A solenoid valve is installed on the discharge pipe to control the amount of flocculant solution added. The mixing tank 6 is installed above the inclined guide plate 3. The mixing tank 6 is used to dissolve the flocculant and release the treated flocculant through the discharge pipe at the bottom of the mixing tank 6. A receiving plate 14 is connected between the bottom surface of the inclined guide plate 3 and the middle part of the mounting plate 7. The mixing tank 6 is installed on the top of the top support plate 11. The top support plate 11 is provided with a material leakage hole at the position directly above the inclined guide plate 3. The bottom discharge pipe of the mixing tank 6 is located inside the material leakage hole. When discharging, the flocculant solution can drip directly onto the wastewater on the inclined guide plate 3 to achieve preliminary mixing.

[0025] The mounting base includes a support ring 15 and several support legs 16. The support ring 15 is fixedly connected to the bottom outer wall of the mixing tank 6 by bolts. The top of the support leg 16 is welded to the support ring 15 and the bottom of the support leg 16 is welded to the top surface of the top support plate 11. There are 3-4 support legs 16, which are evenly distributed below the support ring 15 to ensure the stable installation of the mixing tank 6.

[0026] The feed funnel 17 is welded and fixed to one side of the top of the mixing tank 6. The feed funnel 17 is used to add solid flocculant into the mixing tank 6. The water pipe 18 is used to introduce water into the mixing tank 6. The water pipe 18 is installed on the other side of the top of the mixing tank 6. A flow meter and a solenoid valve are installed on the water pipe 18 to accurately control the amount of water introduced and ensure that the flocculant and water are mixed in a preset ratio. The stirring mechanism 19 is used to stir and dissolve solid flocculants. The stirring mechanism 19 includes a stirring motor, a stirring rod, and stirring blades. The stirring motor is fixed to the sealing cover on the top of the mixing tank 6 by a bracket. The top end of the stirring rod is connected to the rotor end of the stirring motor by a coupling. The bottom end of the stirring rod extends to the bottom of the mixing tank 6. The stirring blades are installed on the outside of the shaft of the stirring rod. The stirring blades are spiral-shaped and can fully stir the solid flocculants and water in the mixing tank 6 to accelerate the dissolution of flocculants and avoid clumping. The speed of the stirring motor can be adjusted by a controller to adapt to the dissolution requirements of different types of flocculants.

[0027] like Figure 2 As shown, the mixing mechanism includes a mounting plate 7, a drive motor 8, a stirring shaft 9, stirring blades 10, and a positioning seat 21; Mounting plate 7 is a rectangular steel plate, with both ends bolted to the two opposite edges of the flocculation tank 1. Mounting plate 7 has a mounting hole in the middle, and a coupling is installed in the mounting hole. The stator of drive motor 8 is fixedly connected to the top surface of mounting plate 7 by bolts. Drive motor 8 is a variable frequency motor, and its speed can be adjusted by a controller. The top end of stirring shaft 9 is connected to the rotor end of drive motor 8 by a coupling. The bottom end of stirring shaft 9 extends into the flocculation tank 1, near the bottom of the tank. The stirring blades 10 are installed on the outer side of the stirring shaft 9. There are 2-3 sets of stirring blades 10, which are evenly distributed along the axial direction of the stirring shaft 9. Each set of stirring blades 10 includes 2 symmetrically arranged blades. The end of the blade away from the stirring shaft 9 is an arc-shaped edge 20. The arc-shaped edge 20 can reduce the resistance of water flow during the stirring process, avoid the generation of local eddies, and at the same time ensure that the wastewater and flocculant solution in the tank are fully mixed. The positioning seat 21 is fixedly connected to the bottom of the flocculation tank 1 by bolts. The top of the positioning seat 21 is provided with a recessed positioning groove, and a rotating bearing is installed in the positioning groove. The bottom end of the stirring shaft 9 is fixed with the inner ring of the rotating bearing by interference fit. The positioning seat 21 can enhance the stability of the stirring shaft 9 when rotating and prevent the stirring shaft 9 from shifting due to long-term stress.

[0028] A partition plate 22 is installed inside the flocculation tank 1. The bottom end of the partition plate 22 is connected to the bottom of the flocculation tank 1, and the partition plate 22 divides the flocculation tank 1 into a flocculation reaction zone on the left and a sedimentation zone on the right.

[0029] The wastewater inlet mechanism, flocculant addition mechanism, and mixing mechanism are all located in the flocculation reaction zone on the left side of the isolation plate 22, ensuring that the wastewater and flocculant are fully mixed in the reaction zone and form flocs; The flocs are carried by the water flow and slowly enter the sedimentation zone on the right side through the top of the isolation plate 22. There is no stirring device in the sedimentation zone, the water flow is stable, and the flocs can settle stably under the action of gravity. The clear water after sedimentation is discharged from the outlet pipe on one side of the sedimentation zone.

[0030] The working process of the desulfurization wastewater sedimentation device of this utility model is as follows: Flocculant dissolution preparation: Open the dust cover of the feed funnel 17 at the top of the mixing tank 6, add the preset amount of solid flocculant into the mixing tank 6, and close the dust cover; open the solenoid valve on the water pipe 18, and introduce water into the mixing tank 6 in proportion, while starting the stirring motor of the stirring mechanism 19. The stirring motor drives the stirring rod and stirring blade to rotate, and fully stirs the solid flocculant and water until the flocculant is completely dissolved to form a uniform flocculant solution; Wastewater introduction and preliminary mixing: Open the flow regulating valve on the inlet pipe 2, and the desulfurization wastewater flows into the inclined guide plate 3 through the inlet pipe 2 and flows slowly along the guide groove on the surface of the inclined guide plate 3; at the same time, open the solenoid valve on the discharge pipe of the mixing tank 6, and the flocculant solution drips into the wastewater on the inclined guide plate 3 through the discharge pipe, and preliminary mixing is achieved during the flow of wastewater; Flocculation reaction: The pre-mixed wastewater enters the flocculation reaction zone on the left side of the flocculation tank 1 through the water passage gap 5 at the bottom of the vertical guide plate 4; the drive motor 8 of the mixing mechanism is started, and the drive motor 8 drives the stirring shaft 9 and the stirring blade 10 to rotate, further and fully stirring the wastewater and flocculant solution in the reaction zone, so that the suspended solids and heavy metal ions in the wastewater react with the flocculant to form flocs; Sedimentation and separation: Wastewater containing flocs slowly enters the sedimentation zone on the right side through the top of the isolation plate 22. The water flow in the sedimentation zone is stable, and the flocs gradually sink to the bottom of the pool under the action of gravity, forming sludge. The electric valve on the sludge discharge pipe is opened periodically to discharge the settled sludge. The clear water after sedimentation is filtered through the filter screen on the effluent pipe and discharged from the effluent pipe to enter the subsequent treatment process or to meet the discharge standards.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A desulfurization wastewater sedimentation device, characterized in that: include: Flocculation tank (1), wastewater inlet mechanism, flocculant addition mechanism, mixing mechanism, The wastewater inlet mechanism includes an inlet pipe (2), an inclined guide plate (3), and a vertical guide plate (4). The inlet pipe (2) is installed at the edge of the flocculation tank (1). The inclined guide plate (3) is connected to the outlet of the inlet pipe (2). The bottom end of the inclined guide plate (3) is inclined towards the tank wall of the flocculation tank (1). The top end of the vertical guide plate (4) is installed at the bottom end of the inclined guide plate (3). A water passage gap (5) is provided between the bottom end of the vertical guide plate (4) and the bottom of the flocculation tank (1). The flocculant addition mechanism includes a mixing tank (6), which is installed above the inclined guide plate (3). The mixing tank (6) is used to dissolve the flocculant and discharge the treated flocculant through the discharge pipe at the bottom of the mixing tank (6). The mixing mechanism includes a mounting plate (7), a drive motor (8), a stirring shaft (9), and stirring blades (10). The two ends of the mounting plate (7) are respectively installed on the two opposite edges of the flocculation tank (1). A coupling is provided on the mounting plate (7). The top end of the stirring shaft (9) is connected to the rotor end of the drive motor (8) through the coupling. The stator of the drive motor (8) is fixedly connected to the top surface of the mounting plate (7). The stirring blades (10) are installed on the outside of the shaft of the stirring shaft (9).

2. The desulfurization wastewater sedimentation device according to claim 1, characterized in that: The wastewater inlet mechanism includes a top support plate (11), two side support plates (12), and two side flow-blocking plates (13). One end of the top support plate (11) is fixedly connected to the top of the inclined guide plate (3), and one end of the top support plate (11) is placed above the inlet pipe (2). The top edges of the two side support plates (12) are respectively fixedly connected vertically to the two sides of the top support plate (11), and the bottom edge of the side support plate (12) is placed outside the pool opening of the flocculation tank (1). One side of the side flow-blocking plate (13) is respectively vertically connected to the side of the vertical guide plate (4) and the side of the inclined guide plate (3), and the other side of the side flow-blocking plate (13) is attached to the inner wall of the flocculation tank (1).

3. The desulfurization wastewater sedimentation device according to claim 2, characterized in that: A receiving plate (14) is connected between the bottom surface of the inclined guide plate (3) and the middle part of the mounting plate (7). The mixing tank (6) is installed on the top of the top support plate (11). The top support plate (11) is provided with a leakage hole at the position directly above the inclined guide plate (3). The bottom discharge pipe of the mixing tank (6) is located inside the leakage hole.

4. The desulfurization wastewater sedimentation device according to claim 3, characterized in that: The mixing tank (6) is equipped with a mounting base, which includes a support ring (15) and several support legs (16). The support ring (15) is fixedly connected to the bottom of the mixing tank (6), the top of the support leg (16) is fixedly connected to the support ring (15), and the bottom of the support leg (16) is fixedly connected to the top surface of the top support plate (11).

5. A desulfurization wastewater sedimentation device according to claim 4, characterized in that: The mixing tank (6) is equipped with a feed funnel (17) and a water pipe (18) at the top. The feed funnel (17) is used to add solid flocculant into the mixing tank (6), and the water pipe (18) is used to introduce water into the mixing tank (6). The mixing tank (6) is equipped with a stirring mechanism (19) for stirring and dissolving the solid flocculant.

6. The desulfurization wastewater sedimentation device according to claim 5, characterized in that: The stirring blade (10) is based on the principle that one end of the stirring shaft (9) is an arc-shaped edge (20).

7. A desulfurization wastewater sedimentation device according to claim 6, characterized in that: The mixing mechanism is also provided with a positioning seat (21), which is fixedly connected to the bottom of the flocculation tank (1). The top of the positioning seat (21) is provided with a recessed positioning groove, and a rotating bearing is arranged in the positioning groove. The bottom end of the stirring shaft (9) is fixedly connected to the inner ring of the rotating bearing.

8. A desulfurization wastewater sedimentation device according to claim 7, characterized in that: The flocculation tank (1) is equipped with a partition plate (22), and the wastewater inlet mechanism, the flocculant addition mechanism, and the mixing mechanism are all located on one side of the partition plate (22).

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