Double-spiral-flow aerator and suspension type aeration device

Abstract

The utility model belongs to the technical field of sewage treatment aerators, and particularly discloses a double-spiral-flow aerator and a suspension type aeration device. The double-swirl aerator comprises a barrel and an air inlet pipe, the upper end of the barrel is connected with an upper swirl flow guide cover, a plurality of groups of upper swirl spray pipes are arranged on the outer wall of the upper swirl flow guide cover, the lower end of the barrel is connected with a lower swirl flow guide cover, the bottom of the lower swirl flow guide cover is open, and a plurality of lower swirl spray pipes are arranged in the lower swirl flow guide cover; and the air inlet pipe penetrates through the upper rotational flow guide cover and the cylinder body and is communicated with the lower rotational flow spray pipe. According to the double-swirl aerator, the upper swirl spray pipe and the lower swirl spray pipe are respectively arranged on the upper swirl flow guide cover and the lower swirl flow guide cover, so that a double-swirl structure is formed, the aeration is uniform, and the oxygen dissolving efficiency can be improved. The suspension type aeration device comprises an air blower and a double-spiral-flow aerator; and the air blower is communicated with an aeration air pipe on the air inlet pipe. According to the suspension type aeration device disclosed by the utility model, the double-spiral-flow aerator is suspended in the aeration tank by utilizing the aeration air pipe, so that the maintenance is convenient.

Description

Technical Field

[0001] This utility model belongs to the technical field of aerators for high-concentration and high-calcium wastewater treatment, and particularly relates to a double swirl aerator and a suspended aeration device. Background Technology

[0002] Aerators are crucial equipment in the activated sludge process. They are key devices for providing the necessary dissolved oxygen (aerobic microorganisms consume oxygen to degrade organic matter), ensuring thorough mixing of wastewater, and suspending activated sludge. Their performance not only affects the wastewater treatment effect but also directly impacts the investment and operating costs of the wastewater treatment facility.

[0003] Existing aerators mainly include: perforated tube aerators, umbrella aerators, microporous aerators, jet aerators, and swirl aerators. Among them, perforated tube aerators, umbrella aerators, microporous aerators, and jet aerators generally have the following problems: (1) uneven aeration, with sudden aeration or aeration dead zones; (2) low dissolved oxygen efficiency, small water treatment volume, and high energy consumption; (3) aerators are easily damaged or blocked, and cannot be repaired or replaced online; (4) problems such as sludge accumulation at the bottom of aerobic tanks, especially in high-concentration and high-calcium wastewater, where aerators are easily scaled and blocked. Existing swirl aerators, due to their large channel design, are not prone to blockage, but they rely solely on protrusions inside the aerator cylinder to cut the incoming air, resulting in large bubbles and low oxygen transfer efficiency; moreover, the air is directly released to the water surface after passing through the aerator cylinder, and the bubbles have a short residence time in the tank, further reducing the oxygen utilization rate.

[0004] In addition, existing aerators are generally fixed at the bottom of the aeration tank, which is inconvenient to maintain. When maintenance or replacement of aerators is required, the aeration tank must be emptied, which can easily affect the normal operation of the biological system.

[0005] Therefore, the inventors dedicated themselves to designing an aerator and aeration device to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a double vortex aerator that not only provides uniform aeration but also prevents sludge accumulation at the bottom of the tank, enhances the mixing effect of mud and water, prolongs the residence time of air bubbles, and improves dissolved oxygen efficiency. It is also less prone to scaling and clogging, even in high-concentration, high-calcium wastewater.

[0007] Another objective of this invention is to provide a suspended aeration device that can be inspected or replaced online, making maintenance convenient and not affecting the normal operation of the biochemical system.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A dual-swirl aerator includes a cylindrical body and an air inlet pipe. The upper end of the cylindrical body is connected to an upper swirl guide shroud, and the outer wall of the upper swirl guide shroud is provided with multiple sets of upper swirl nozzles for discharging fluid from inside the upper swirl guide shroud. The lower end of the cylindrical body is connected to a lower swirl guide shroud, the bottom of the lower swirl guide shroud is open and multiple lower swirl nozzles are provided inside it. The air inlet pipe passes through the upper swirl guide shroud and the cylindrical body from top to bottom and is connected to all the lower swirl nozzles.

[0010] As an improvement of the dual-swirl aerator of this utility model, all the lower swirl nozzles are arranged in a dispersed manner around the air inlet pipe and have the same spray direction. Each of the lower swirl nozzles rises along the inner wall of the lower swirl guide shroud in a spiral path.

[0011] As an improvement of the dual-swirl aerator of this utility model, the spiral rise angle of the lower swirl nozzle is 10° to 45°, and the number of spiral turns is 0.25 to 0.75 turns.

[0012] As an improvement of the dual-swirl aerator of this utility model, the side wall of the lower swirling guide shroud is inclined to form a positive conical cylindrical shape, and the inclination angle of the side wall of the lower swirling guide shroud is 15° to 60°.

[0013] As an improvement of the dual-swirl aerator of this utility model, the bottom of the air inlet pipe is connected to all the lower swirl nozzles through a diverter pipe, and the spiral spray direction of all the lower swirl nozzles is consistent with the inclined spray direction of all the upper swirl nozzles.

[0014] As an improvement of the dual-swirl aerator of this utility model, the cylinder is cylindrical, and the inner wall of the cylinder is provided with multiple layers of turbulence generators, with the same layer of turbulence generators arranged in a ring around the air inlet pipe at intervals.

[0015] As an improvement of the dual-swirl aerator of this utility model, the side wall of the upper swirling guide hood is inclined to form an inverted conical cylindrical shape, and the inclination angle of the side wall of the upper swirling guide hood is 10° to 45°.

[0016] As an improvement of the dual-swirl aerator of this utility model, each of the upper swirl nozzles gradually narrows along its outlet direction and its downward tilt angle is 10° to 45°. Each group of upper swirl nozzles is arranged in a ring around the upper swirl guide shroud and the spraying direction is consistent.

[0017] To achieve the aforementioned other objective, the technical solution adopted by this utility model is as follows:

[0018] A suspended aeration device includes a blower and the aforementioned dual-swirl aerator. An aeration duct for suspending the dual-swirl aerator in an aeration tank is connected to the air inlet pipe. The main air duct of the blower is connected to the aeration duct.

[0019] As an improvement of the suspended aeration device of this utility model, there are multiple dual-swirl aerators and aeration pipes, which are arranged in a one-to-one correspondence. The main pipe is connected to all the aeration pipes through branch pipes. A main valve is provided on the branch pipe. Each aeration pipe is provided with a flange ball valve on the part outside the water surface of the aeration tank. The dual-swirl aerator is made of stainless steel.

[0020] Compared with existing technologies, the dual-swirl aerator of this invention features an upper swirl guide hood and a lower swirl guide hood at the upper and lower ends of the cylinder, respectively. A lower swirl nozzle is installed inside the lower swirl guide hood, and an upper swirl nozzle is installed outside the upper swirl guide hood, forming a dual-swirl structure. Air entering through the air inlet pipe first exits through the lower swirl nozzle, agitating the sludge and wastewater. The resulting mixed fluid rises and rotates within the lower swirl guide hood to the cylinder, then enters the upper swirl guide hood, where the flow pattern changes, creating turbulence. Finally, it is ejected from the upper swirl nozzle and released outside the aerator, agitating the sludge at the bottom of the tank and extending the residence time of air bubbles within the tank. The entire aerator not only provides uniform aeration but also prevents sludge accumulation at the bottom of the tank, enhances the mud-water mixing effect, prolongs air bubble residence time, and improves dissolved oxygen efficiency. Even in high-concentration, high-calcium wastewater, it is less prone to scaling and clogging.

[0021] Compared with the prior art, the suspended aeration device of this utility model uses aeration pipes to suspend a double vortex aerator with uniform aeration, non-scaling and non-clogging properties, and high dissolved oxygen efficiency in the aeration tank. It can be inspected or replaced online, which is convenient for maintenance and will not affect the normal operation of the biochemical system. Attached image description:

[0022] Figure 1 This is an enlarged three-dimensional schematic diagram of the dual-swirl aerator of this utility model;

[0023] Figure 2 This is an enlarged three-dimensional structural schematic diagram of the dual-swirl aerator of this utility model;

[0024] Figure 3 This is an enlarged cross-sectional view of the dual-swirl aerator of this utility model;

[0025] Figure 4 This is an enlarged cross-sectional view of another part of the dual-swirl aerator of this utility model;

[0026] Figure 5 This is a three-dimensional enlarged view of the air intake pipe and the two lower swirling nozzles of this utility model;

[0027] Figure 6 This is a simplified schematic diagram of the installation structure of the suspended aeration device of this utility model.

[0028] Illustration:

[0029] 1. Cylinder body; 11. Lower swirl guide hood; 12. Upper swirl guide hood; 2. Upper swirl nozzle; 21. Upper swirl nozzle; 3. Air inlet pipe; 31. Diverter pipe; 4. Lower swirl nozzle; 41. Lower swirl nozzle; 5. Turbulence generator; 6. Double swirl aerator; 7. Main air duct; 71. Branch pipe; 711. Main valve; 72. Aeration air duct; 721. Flange ball valve; 8. Aeration tank; 81. Tank bottom; 82. Water surface. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. The drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of this utility model.

[0031] Reference Figures 1 to 5 A dual-swirl aerator 6 includes a cylindrical body 1 and an air inlet pipe 3. The upper end of the cylindrical body 1 is connected to an upper swirl guide shroud 12. The outer wall of the upper swirl guide shroud 12 is provided with multiple sets of upper swirl nozzles 2 for guiding the fluid inside the upper swirl guide shroud 12. The lower end of the cylindrical body 1 is connected to a lower swirl guide shroud 11. The bottom of the lower swirl guide shroud 11 is open and multiple lower swirl nozzles 4 are provided inside it. The air inlet pipe 3 passes through the upper swirl guide shroud 12 and the cylindrical body 1 from top to bottom and is connected to all the lower swirl nozzles 4.

[0032] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The cylindrical body 1, the upper swirling guide shroud 12, and the lower swirling guide shroud 11 are coaxially arranged and interconnected. The cylindrical body 1 is located between the upper swirling guide shroud 12 and the lower swirling guide shroud 11. The cylindrical body 1 is cylindrical. The side wall of the lower swirling guide shroud 11 is inclined to form a positive conical shape. The inclination angle of the side wall of the lower swirling guide shroud 11 is 15° to 60°. The side wall of the upper swirling guide shroud 12 is inclined to form an inverted conical shape. The inclination angle of the side wall of the upper swirling guide shroud 12 is 10° to 45°. Each upper swirling nozzle 2 gradually narrows along its outlet direction and its downward inclination angle is 10° to 45°. Each group of upper swirling nozzles 2 is arranged in a ring around the upper swirling guide shroud 12 and the spray direction is consistent. Each upper swirling nozzle 2 has an upper swirling nozzle 21 at its end.

[0033] Reference Figure 3The inner wall of the cylinder 1 is provided with multiple layers of turbulence generators 5. The same group of turbulence generators 5 are arranged in a ring around the air inlet pipe 3. The turbulence generators 5 have a special curved surface structure and are distributed in multiple layers along the circumference inside the cylinder 1. 4 to 8 layers of turbulence generators 5 can be set inside the cylinder 1, with 4 to 8 turbulence generators 5 in each layer. The turbulence generators 5 are mainly used to generate turbulence (turbulence is a complex and irregular fluid motion state, characterized by the randomness and pulsation of physical quantities such as fluid velocity and pressure in time and space).

[0034] Reference Figure 2 , Figure 3 and Figure 5 Preferably, there are two lower swirling nozzles 4. Each lower swirling nozzle 4 has a lower swirling nozzle 41 at its end. The upper end of the air inlet pipe 3 extends vertically from the top surface of the upper swirling guide shroud 12 to the outside of the upper swirling guide shroud 12. The bottom of the air inlet pipe 3 is connected to the two lower swirling nozzles 4 through a split pipe 31. The air inlet pipe 3 and the split pipe 31 are vertically connected to form a T-shape. The two lower swirling nozzles 4 are located at the two ends of the split pipe 31, and all the lower swirling nozzles 4 are dispersed around the air inlet pipe 3. The nozzles are arranged in a spiral pattern and spray in the same direction. Each lower swirling nozzle 4 rises along the inner wall of the lower swirling guide shroud 11 in a spiral path. The spiral rise angle of the lower swirling nozzle 4 is 10° to 45°, and the number of spiral turns is 0.25 to 0.75. In this embodiment, the spiral spray direction of all lower swirling nozzles 4 is consistent with the inclined spray direction of all upper swirling nozzles 2 (for example, the spiral spray direction of the lower swirling nozzle 4 and the inclined spray direction of the upper swirling nozzle 2 are both counterclockwise). Figure 2 (Structure shown).

[0035] Reference Figures 1 to 5 The working principle of the dual-swirl aerator 6 of this utility model is as follows:

[0036] External air enters the diversion pipe 31 from the upper end of the air inlet pipe 3, and after being diverted by the diversion pipe 31, it enters the two lower swirling nozzles 4, and is then released from the lower swirling nozzles 41 of the two lower swirling nozzles 4. It then spirals upward along the inner wall of the lower swirling guide shroud 11, stirring and mixing the sewage and sludge, so that the mixture of mud, water and air is powerfully rotated in the lower swirling guide shroud 11 and enters the cylinder 1.

[0037] The mixture of mud, water and gas rotates powerfully inside the cylinder 1 and is repeatedly cut by the turbulence generator 5. When the mixture is cut by the turbulence generator 5, the special curved surface structure of the turbulence generator 5 causes a large amount of turbulence to be generated in the mixture, which further refines and mixes the mud, water and gas and enhances the oxygen transfer efficiency.

[0038] After being cut by the turbulence generator 5, the mixed fluid rotates and rises from the cylinder 1 into the larger cross-sectional area of ​​the upward swirling guide shroud 12. At this time, the fluid shape changes, generating further turbulence and enhancing oxygen transfer efficiency.

[0039] The mixed fluid continues to rotate strongly inside the upper swirling guide shroud 12 and enters the upper swirling nozzle 2. The upper swirling nozzle 21 of the upper swirling nozzle 2 sprays downward at an angle, stirring up the sludge at the bottom of the pool 81 and prolonging the residence time of air in the pool, thereby enhancing oxygen transfer efficiency.

[0040] The dual-swirl aerator 6 of this invention introduces air entering through the air inlet pipe 3, which is then discharged through the lower swirl nozzle 4, agitating the sludge and wastewater. The resulting mixed fluid rises and rotates within the lower swirl guide hood 11 into the cylinder 1. The powerfully rotating mixed fluid then cuts through the turbulence generator 5. The irregular curved surface structure of the turbulence generator 5 induces turbulence in the mixed fluid, producing a strong mixing effect of sludge, water, and air. After passing through the cylinder 1, the mixed fluid rotates into the upper swirl guide hood 12, where its flow pattern changes, generating turbulence. It then rotates along the upper swirl guide hood 12 to the upper swirl nozzle 2, where it is sprayed out of the aerator, agitating the sludge at the bottom 81 of the tank and extending the residence time of air bubbles within the tank.

[0041] Compared with commonly used aerators and swirl aerators, the dual-swirl aerator 6 of this utility model has the following advantages:

[0042] ① The aerator generates a strong swirling of mud, water, and air, which can produce a self-cleaning effect. Even if it operates intermittently, it will not have any adverse effects.

[0043] ② The aerator creates a mud-water-air jet effect at the top, eliminating the need for an additional jet pump, thus improving oxygen utilization and reducing energy consumption.

[0044] ③ Combining the advantages of swirl and jet aeration, the aerator uses a special curved surface structure unit to generate turbulence, resulting in high oxygen utilization, low energy consumption, and a large service area.

[0045] ④ It adopts a large channel design, which has a large air volume, and the aerator is not easy to clog or scale. The dissolved oxygen performance does not decrease with long-term use; the pressure loss is low, which is beneficial to the energy saving of the blower in the long-term operation.

[0046] ⑤ The bottom of the aerator is equipped with a downward swirling guide hood 11, which sucks up the sludge 81 at the bottom of the tank under the action of air lifting, and the angled jet flow at the top of the aerator also washes the sludge 81 at the bottom of the tank, so there is no sludge deposition in the aerobic tank.

[0047] ⑥ The entire double swirl aerator 6 is made of stainless steel, which is sturdy, durable, not easy to wear, and not easy to age.

[0048] Reference Figure 6A suspended aeration device includes a blower and a double swirl aerator 6. An aeration duct 72 for suspending the double swirl aerator 6 in an aeration tank 8 is connected to the air inlet pipe 3. The blower is located outside the aeration tank 8 and its main air duct 7 is connected to the aeration duct 72.

[0049] Reference Figure 6 In this utility model, there are multiple double swirl aerators 6 and aeration pipes 72, and they are arranged in a one-to-one correspondence. The main pipe 7 is connected to all aeration pipes 72 through branch pipes 71. A main valve 711 is provided on the branch pipe 71. Each aeration pipe 72 is provided with a flange ball valve 721 on the part outside the water surface 82 of the aeration tank 8. The entire double swirl aerator 6 is made of stainless steel.

[0050] The working principle of the suspended aeration device of this utility model is as follows: the air output by the blower enters the branch pipe 71 from the main air pipe 7, and then is divided into each aeration air pipe 72 by the branch pipe 71. Then it enters the air inlet pipe 3 of the double swirl aerator 6, and passes through the lower swirl nozzle 4, the lower swirl guide hood 11, the cylinder 1, and the upper swirl guide hood 12 of the double swirl aerator 6 in sequence. Finally, it is sprayed obliquely downward from the upper swirl nozzle 2 of the double swirl aerator 6 to the bottom 81 of the aeration tank 8, which agitates the sludge at the bottom 81 of the tank.

[0051] Reference Figure 6 The suspended aeration device of this utility model adopts a suspended installation method, which facilitates maintenance: when it is necessary to clean and maintain the double swirl aerator 6, simply close the flange ball valve 721 of the aeration pipe 72 above the water surface 82, remove the flange at the lower end of the flange ball valve 721, and then pull the aeration pipe 72 and the double swirl aerator 6 to the surface of the pool. This installation method avoids the disadvantage of the common aeration pool being fixedly installed at the bottom 81 of the pool. When it is necessary to maintain or replace the aerator, even if the aeration pool is not emptied, it will not affect the normal operation of the biological system.

[0052] The suspended aeration device of this utility model adopts a suspended installation, which can be upgraded online and the aerator can be cleaned and maintained online without the need for pool cleaning and drainage, and does not affect the normal operation of the aerobic system.

[0053] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the patent application of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A dual-swirl aerator, comprising a cylindrical body and an air inlet pipe, characterized in that, The upper end of the cylinder is connected to an upper swirling guide shroud. The outer wall of the upper swirling guide shroud is provided with multiple sets of upper swirling nozzles for discharging fluid from inside the upper swirling guide shroud. The lower end of the cylinder is connected to a lower swirling guide shroud. The bottom of the lower swirling guide shroud is open and multiple lower swirling nozzles are provided inside it. The air inlet pipe passes through the upper swirling guide shroud and the cylinder from top to bottom and is connected to all the lower swirling nozzles.

2. The dual-swirl aerator according to claim 1, characterized in that, All of the downward swirling nozzles are arranged in a dispersed manner around the air intake pipe and spray in the same direction. Each of the downward swirling nozzles rises along the inner wall of the downward swirling guide shield in a spiral path.

3. The dual-swirl aerator according to claim 1, characterized in that, The spiral rise angle of the lower swirling nozzle is 10° to 45°, and the number of spiral turns is 0.25 to 0.

75.

4. The dual-swirl aerator according to claim 1, characterized in that, The sidewall of the downward swirling shroud is inclined to form a positive conical cylindrical shape, and the inclination angle of the sidewall of the downward swirling shroud is 15° to 60°.

5. The dual-swirl aerator according to claim 1, characterized in that, The bottom of the air intake pipe is connected to all the lower swirling nozzles through a splitter pipe, and the spiral spray direction of all the lower swirling nozzles is consistent with the inclined spray direction of all the upper swirling nozzles.

6. The dual-swirl aerator according to claim 1, characterized in that, The cylinder is cylindrical, and multiple turbulence generators are provided on the inner wall of the cylinder. The turbulence generators in the same layer are arranged in a ring around the air intake pipe at intervals.

7. The dual-swirl aerator according to claim 1, characterized in that, The sidewall of the upper swirling guide shield is inclined to form an inverted conical cylindrical shape, and the inclination angle of the sidewall of the upper swirling guide shield is 10° to 45°.

8. The dual-swirl aerator according to claim 1, characterized in that, Each of the upper swirling nozzles gradually narrows along its exit direction and its downward tilt angle is 10° to 45°. Each group of upper swirling nozzles is arranged in a ring around the upper swirling guide shroud and the spray direction is consistent.

9. A suspended aeration device, characterized in that, It includes a blower and a dual-swirl aerator as described in any one of claims 1-8, wherein the air inlet pipe is connected to an aeration duct for suspending the dual-swirl aerator in the aeration tank, and the main air duct of the blower is connected to the aeration duct.

10. The suspended aeration device according to claim 9, characterized in that, The number of dual-swirl aerators and aeration pipes are multiple and are arranged in a one-to-one correspondence. The main pipe is connected to all the aeration pipes through branch pipes. A main valve is provided on the branch pipe. Each aeration pipe is provided with a flange ball valve on the part outside the water surface of the aeration tank. The dual-swirl aerator is made of stainless steel.

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