Aeration air cooling device for aerobic tank

Abstract

The utility model provides an aerobic tank aeration air cooling device, which comprises a cooling tower, a pipeline heat exchanger and a circulating pump, the cooling tower comprises a tower body, a cooling fan positioned at the top end of the tower body, a spraying system arranged below the cooling fan, a filler arranged below the spraying system, and a water-saving disc arranged at the bottom of the tower body, the tower body is provided with a shutter between the water-saving disc and the filler, the pipeline heat exchanger is arranged in the water-saving disc, the bottom of the water-saving disc is provided with a water outlet connected with a water inlet of the circulating pump, and the water outlet of the circulating pump is connected with the spraying system through a backflow pipeline. Through the circulating pump, the spraying system and the cooling fan, heated water in the water-saving disc is circularly cooled, and cooling water is continuously formed, so that the temperature of aeration air in the pipeline heat exchanger is effectively reduced, and negative effects caused by over-high temperature of the aeration air are avoided; the cooling device is simple in structure, small in longitudinal arrangement size, high in operation efficiency and easy to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of aeration air cooling, in particular to an aeration air cooling device for an aerobic pool. Background Art

[0002] In the wastewater treatment industry, most aerobic biochemical tanks use Roots blowers for aeration. Roots blowers convert electrical energy into mechanical energy, which in turn converts the potential and thermal energy of the gas. This mechanical energy is used for compression work, increasing the pressure of the gas in the air duct. As the depth of the aerobic tank increases, the required air pressure in the air duct also increases, and the thermal energy converted from electrical energy also increases, causing the temperature of the aeration air to increase.

[0003] When Roots blowers are used for aeration in aerobic tanks used in leachate, biogas, and other high-concentration wastewater treatment processes, or in municipal and industrial wastewater treatment, aeration air temperatures exceeding 80°C (80°C) can lead to the following problems: 1. Decreased gas solubility: The solubility of gases in liquids decreases with increasing temperature. High temperatures reduce the solubility of oxygen, resulting in a decrease in the amount of dissolved oxygen in the water under the same conditions. 2. Adverse effects on microbial activity: High temperatures can inhibit the activity of aerobic microorganisms, which are generally sensitive to temperature fluctuations. This slows the metabolic rate of microorganisms, reducing their efficiency in degrading organic matter. 3. Decreased aeration efficiency: At high temperatures, the aeration system may require more energy to maintain the same oxygen transfer efficiency. This not only increases operating costs, but if the aeration system is not adjusted accordingly, the actual dissolved oxygen level may be lower than the desired level. 4. Impact on equipment performance: High temperatures can affect the effectiveness of aeration equipment. For example, blowers and other related equipment may not operate at optimal levels in high-temperature environments, thus affecting aeration efficiency.

[0004] At present, shell-and-tube aeration cooling towers are often used in industry to cool aeration air, but they have the following defects: (1) Limited heat exchange efficiency: Since the heat exchange area of ​​shell-and-tube cooling towers is relatively small, this limits the amount of heat that can be processed per unit time. Although the increase in the number of heat exchange tubes can partially make up for this shortcoming, it also leads to an increase in the size of the equipment. (2) Space occupation problem: The increase in heat exchange tubes directly leads to an increase in the area occupied by the cooling tower. In industrial areas with limited land resources, this may become a difficult problem for enterprises in equipment layout and cost control. (3) Algae growth problem: The water environment in the cooling tower is prone to become a breeding ground for algae growth. Algae will not only adhere to the heat exchange tubes, affecting the heat exchange efficiency, but may also release harmful substances, causing secondary pollution to the water quality and equipment. (4) Salt accumulation and scaling: As the operating time increases, the dissolved salts in the water gradually accumulate on the surface of the heat exchanger. Once saturated, they will precipitate to form hard scale. These hard scales will not only reduce the heat exchange efficiency, but may also corrode the heat exchange tubes and shorten the service life of the equipment. (5) Difficulty in mud removal: The accumulation of mud and sand at the bottom of the cooling tower and on the surface of the heat exchanger makes mud removal complicated and difficult. Traditional mud removal methods may not be able to completely remove the accumulated materials, and more efficient and environmentally friendly mud removal technology is needed. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an aerobic pool aeration air cooling device to solve the problems of low heat exchange efficiency, large equipment volume, and algae, salt and sediment attached to the heat exchange tubes of the shell and tube aeration air cooling tower in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the utility model provides an aeration air cooling device for an aerobic pool, comprising a cooling tower, a pipeline heat exchanger and a circulation pump. The cooling tower comprises a tower body, a cooling fan located at the top of the tower body, a spray system arranged below the cooling fan, a filler arranged below the spray system, and a water-saving tray arranged at the bottom of the tower body. The tower body is provided with a louver between the water-saving tray and the filler. The pipeline heat exchanger is arranged in the water-saving tray. The bottom of the water-saving tray is provided with a water outlet connected to the water inlet of the circulation pump. The water outlet of the circulation pump is connected to the spray system through a return pipe.

[0007] In one embodiment of the present invention, an ultrasonic descaling and algae removing device is provided in the water-saving tray, and the ultrasonic descaling and algae removing device is located below the pipeline heat exchanger.

[0008] In one embodiment of the present invention, a sludge hopper is provided in the middle of the bottom of the water-saving tray. The bottom of the water-saving tray is an inclined plate that tilts downward from the outer periphery to the sludge hopper. The water outlet is opened on the side wall of the sludge hopper, and a sludge outlet is opened at the bottom of the sludge hopper.

[0009] In one embodiment of the present invention, a water replenishment float switch is provided in the water-saving tray.

[0010] In one embodiment of the present invention, the filler is installed in the tower body at an inclination of 10 to 20 degrees.

[0011] In one embodiment of the present invention, the filler is made of at least one of stainless steel, aluminum alloy or ceramic.

[0012] In one embodiment of the present invention, the tower body is provided with an inward-facing guide plate below the filler.

[0013] In one embodiment of the present invention, the tower body is disposed on a concrete base.

[0014] In one embodiment of the present invention, the pipe heat exchanger includes a main pipe at both ends, an air distribution plate and a plurality of branch pipes. The plurality of branch pipes are connected to the main pipe through the air distribution plates respectively, and heat dissipation fins are evenly arranged on the outside of the branch pipes.

[0015] In one embodiment of the present invention, the pipe heat exchanger includes a plurality of branch pipes, and the branch pipes are connected in series.

[0016] As described above, the aerobic pool aeration air cooling device of the present invention has the following beneficial effects:

[0017] 1. The utility model circulates and cools the heated water in the water-saving tray through a circulation pump, a spray system and a cooling fan, continuously forming cooling water, thereby effectively reducing the temperature of the aeration air in the pipeline heat exchanger and avoiding the negative impact caused by excessively high aeration air temperature; and the cooling device of the utility model has a simple structure, a small vertical arrangement volume, high operating efficiency and is easy to maintain.

[0018] 2. The utility model sets an ultrasonic descaling and algae removal device and a sludge bucket at the water-saving tray to kill algae, which settles and adheres to the surface of the heat exchanger; and breaks up scaling substances to prevent inorganic salts, sludge and other impurities from being adsorbed on the heat exchanger or the water-saving tray, thereby reducing heat exchange efficiency.

[0019] 3. The pipe heat exchanger of the present invention includes multiple branch pipes, and heat dissipation fins are evenly arranged on the outside of the branch pipes to increase the contact area with the cooling water and greatly improve the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of an aerobic tank aeration air cooling device disclosed in Example 1 of the present utility model.

[0021] Figure 2 This is a schematic diagram of the structure of the pipe heat exchanger disclosed in Example 1 of the present utility model. Figure 1.

[0022] Figure 3 This is a schematic diagram of the structure of the pipe heat exchanger disclosed in Example 1 of the present utility model. Figure 2 .

[0023] Figure 4 This is a schematic structural diagram of the pipeline heat exchanger disclosed in Example 2 of the present utility model.

[0024] Component number description

[0025] 100. Tower body; 101. Guide plate; 200. Cooling fan; 300. Spray system; 400. Filler; 500. Shutter; 600. Water-saving tray; 601. Water replenishment float switch; 602. Inclined plate; 603. Sludge hopper; 604. Water outlet; 605. Sludge outlet; 606. Ultrasonic descaling and algae removal device; 700. Circulation pump; 701. Return pipe; 800. Pipe heat exchanger; 801. Air inlet; 802. Air outlet; 803. Branch pipe; 804. Heat dissipation fins; 805. Air distribution plate; 900. Concrete base. DETAILED DESCRIPTION

[0026] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless there is a conflict.

[0027] Example 1

[0028] See also Figure 1 This embodiment provides an aerobic pool aeration air cooling device, including a cooling tower, a pipe heat exchanger 800 and a circulating pump 700. The cooling tower includes a tower body 100, a cooling fan 200 located at the top of the tower body, a spray system 300 arranged below the cooling fan, a filler 400 arranged below the spray system, and a water-saving tray 600 arranged at the bottom of the tower body. The tower body is provided with a louver 500 between the water-saving tray and the filler. The pipe heat exchanger 800 is arranged in the water-saving tray 600. The bottom of the water-saving tray 600 is provided with a water outlet 604 connected to the water inlet of the circulating pump 700. The water outlet 604 of the circulating pump 700 is connected to the spray system 300 through a return pipe 701.

[0029] The aeration air transfers heat to the water in the water-saving tray 600 via the pipe heat exchanger 800. Under the action of the circulation pump 700, the heated hot water in the water-saving tray 600 is transported to the spray system 300 at the top of the tower body through the return pipe 701. The spray system 300 sprays the water evenly onto the filler 400. In the filler, the hot water is cooled by convection heat exchange with the air to form cooling water. Under the action of gravity, it falls back into the water-saving tray of the cooling device to cool the pipe heat exchanger, thereby cooling the pipe heat exchanger.

[0030] As the cooling device continues to operate, salt accumulates in the cooling water. To mitigate scaling in the heat exchanger, an ultrasonic descaling and algae removal device 606 is installed within the water-saving tray 600 and is located below the pipe heat exchanger 800. When activated, the ultrasonic descaling and algae removal device 606 emits ultrasonic waves in the horizontal and vertical directions of the pipe heat exchanger 800.

[0031] The ultrasonic descaling and algae removal device 606 works by generating ultrasonic waves, which form tiny bubbles in the water. These bubbles burst and release energy, damaging algae cell membranes and causing their death. Furthermore, the sound waves induce turbulence in the water, preventing algae from settling and adhering to surfaces. Ultrasonic cavitation pulverizes scaling substances by generating high-pressure peaks. The activation effect enhances the activity of the fluid and scaling substances, preventing scale from depositing on the heat exchanger tube walls. The shearing effect loosens the scale layer by generating relative shear force. The inhibition effect reduces the adhesion of scaling ions to the wall by changing the physical and chemical properties of the fluid.

[0032] Furthermore, the ultrasonic descaling and algae removal device 606 uses a frequency of 40 to 100 kHz.

[0033] After ultrasonic waves break up scaling, a large amount of inorganic salts and impurities remain in the water-saving tray. To prevent these inorganic salts and impurities from being absorbed into the pipeline heat exchanger and packing, which would reduce heat exchange efficiency, a sludge hopper 603 is located in the center of the bottom of the water-saving tray 600. The bottom of the water-saving tray 600 is formed by an inclined plate 602 that slopes downward from the periphery toward the sludge hopper 603. The water outlet 604 is located on the side wall of the sludge hopper 603, and a sludge outlet 605 is located at the bottom of the sludge hopper 603. Under the influence of ultrasonic flow, sludge such as inorganic salts and impurities accumulates along the inclined plate 602 at the bottom and into the sludge hopper 603. The sludge is discharged from the system by periodically opening the sludge outlet 605.

[0034] In order to achieve water balance, a water replenishment float switch 601 is provided in the water-saving tray 600. The water replenishment float switch will automatically open the water replenishment float switch to replenish water according to the liquid level of the water-saving tray 600.

[0035] In order to extend the cooling time of hot water in the filler 400, the filler 400 is installed in the tower body 100 at an angle of 10 to 20 degrees, using countercurrent cooling. Each filler is fixed to maintain appropriate gaps between the fillers.

[0036] Furthermore, the filler 400 is made of a material with good heat transfer performance and can withstand high temperature without deformation, such as stainless steel, aluminum alloy or ceramic.

[0037] In order to prevent the cooling water from the filler 400 from flowing out of the tower body 100 through the louver 500 , the tower body 100 is provided with an inward-facing guide plate 101 below the filler 400 to guide the cooling water so that it all falls back into the water-saving tray 600 .

[0038] Furthermore, the tower body 100 is set on a concrete base 900 .

[0039] Reference Manual Figure 2 and 3 The pipe heat exchanger 800 comprises a main pipe at each end, an air distribution plate 805, and several branch pipes 803. Each branch pipe 803 is connected to the main pipe via the air distribution plate 805. Heat dissipation fins 804 are evenly arranged on the exterior of each branch pipe 803. Aeration air enters the pipe heat exchanger 800 through the air inlet 801. The air distribution plate 805 evenly distributes the aeration air from the main pipe to each branch pipe 803. Because the heat dissipation fins 804 are evenly arranged on the exterior of each branch pipe 803, the heat of the aeration air is transferred to the aeration branch pipes 803. Some of the heat is directly transferred to the sprayed cooling water, while the majority of the heat is transferred to the cooling tower water via the heat dissipation fins 804, ultimately cooling the aeration air.

[0040] The main operating steps of the cooling device of this embodiment include:

[0041] S1. Aeration air enters the interior of the pipe heat exchanger 800 through the air inlet 801. The air distribution plate 805 evenly disperses the aeration air into each branch pipe 803. The temperature of the aeration air is transferred to the heat dissipation fins 804 outside the branch pipe 803. Part of the heat is directly transferred to the sprayed cooling water, and most of the temperature is transferred to the water in the water-saving tray 600 through the heat dissipation fins 804. Ultimately, the aeration air temperature is reduced from 80-90°C to 40-50°C. The cooled aeration air is collected through the air outlet 802 of the pipe heat exchanger 800 and then transported to the aerator of the sewage aerobic tank to provide air for the microorganisms in the aerobic tank.

[0042] S2. The aeration air transfers heat to the water in the water-saving tray 600 through the pipe heat exchanger 800. The heated hot water expands due to the heat and moves upward, forming convection contact with the cooling water that has cooled down and fallen in the cooling tower, thereby cooling the hot water. In addition, a portion of the hot water heated by the pipe heat exchanger 800 is mixed with the cooling water at the bottom of the water-saving tray 600. The mixed hot water in the water-saving tray 600 is pumped to the spray system 300 on the upper part of the cooling device by the circulation pump 700 under the suction force of the circulation pump 700, and the hot water is evenly distributed in the filler 400. After being cooled by convection heat exchange with the air, the hot water in the filler falls back into the water-saving tray 600 under the action of gravity.

[0043] S3. The air around the cooling device enters the cooling device through the louvers 500 and flows upward into the filler 400. On the inner wall of the filler 400, the cold air exchanges heat with the hot water flowing downward, thereby cooling the hot water. The cold air is heated to become hot air, which is then sent out of the system under the upward push of the cooling fan 200.

[0044] S4. As the cooling device continues to operate, the cooling fan 200 continuously delivers hot air from the cooling device, displacing a large amount of water vapor from the cooling water. To achieve water balance, the water replenishment float switch 601 automatically opens based on the liquid level in the water-saving tray 600 to replenish water. As operation continues, salt accumulates in the cooling water. To mitigate scaling in the heat exchanger, the ultrasonic descaling and algae removal device 606 is activated, emitting ultrasonic energy in both the horizontal and vertical directions of the pipe heat exchanger 800.

[0045] S5. After the ultrasonic wave breaks up the scaling materials, a large amount of inorganic salts and impurities remain in the water-saving tray 600. Under the action of the ultrasonic end flow, they accumulate along the inclined plate 602 at the bottom into the sludge hopper 603. The sludge is discharged from the system by regularly opening the sludge outlet 605.

[0046] Example 2

[0047] See also Figure 1 This embodiment provides an aerobic pool aeration air cooling device, which is different from the embodiment 1 in that: Figure 4 The pipe heat exchanger includes several branch pipes 803 connected in series. Heat dissipation fins 804 are evenly distributed on the exterior of the branch pipes. This design effectively extends the residence time of the aeration air within the pipe heat exchanger, providing more time for heat exchange between the aeration air and the cooling water, thereby significantly improving heat exchange efficiency.

[0048] Furthermore, an automatic drain valve (not shown) is installed at the lowest end of the pipe heat exchanger. The automatic drain valve plays an important role in effectively and promptly removing any accumulated moisture, significantly reducing the possibility of blockage in the pipe heat exchange duct.

[0049] In summary, the present invention circulates and cools the heated water in the water-saving tray through a circulation pump, a spray system, and a cooling fan, continuously forming cooling water, thereby effectively reducing the temperature of the aeration air in the pipe heat exchanger and avoiding the negative impact caused by excessively high aeration air temperature. The cooling device of the present invention has a simple structure, a small vertical arrangement volume, high operating efficiency, and is easy to maintain. The present invention kills algae by providing an ultrasonic descaling and algae removal device and a sludge bucket at the water-saving tray, which settles and adheres to the surface of the heat exchanger. It also breaks up scaling materials to prevent impurities such as inorganic salts and sludge from being adsorbed on the heat exchanger or water-saving tray, thereby reducing heat exchange efficiency. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial utilization value.

[0050] Among them, the terms such as "upper", "lower", "left", "right", "front", "back", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any equivalent modifications or variations made by persons skilled in the art without departing from the spirit and technical concepts disclosed herein shall be encompassed by the claims of the present invention.

Claims

1. An aerobic pool aeration air cooling device, characterized in that: It includes a cooling tower, a pipeline heat exchanger and a circulation pump. The cooling tower includes a tower body, a cooling fan located at the top of the tower body, a spray system arranged below the cooling fan, a filler arranged below the spray system, and a water-saving tray arranged at the bottom of the tower body. The tower body is provided with a shutter between the water-saving tray and the filler. The pipeline heat exchanger is arranged in the water-saving tray. The bottom of the water-saving tray is provided with a water outlet connected to the water inlet of the circulation pump. The water outlet of the circulation pump is connected to the spray system through a reflux pipe.

2. The aerobic pool aeration air cooling device according to claim 1, characterized in that: An ultrasonic descaling and algae removing device is provided in the water-saving tray, and the ultrasonic descaling and algae removing device is located below the pipeline heat exchanger.

3. The aerobic pool aeration air cooling device according to claim 2, characterized in that: A sludge hopper is provided in the middle of the bottom of the water-saving tray. The bottom of the water-saving tray is an inclined plate that slopes downward from the periphery to the sludge hopper. The water outlet is provided on the side wall of the sludge hopper. A sludge outlet is provided at the bottom of the sludge hopper.

4. The aerobic pool aeration air cooling device according to claim 1, characterized in that: A water replenishment float switch is provided in the water-saving tray.

5. The aerobic pool aeration air cooling device according to claim 1, characterized in that: The filler is installed in the tower body in a manner of being inclined at 10 to 20 degrees.

6. The aerobic pool aeration air cooling device according to claim 1, characterized in that: The filler is made of at least one of stainless steel, aluminum alloy or ceramic material.

7. The aerobic pool aeration air cooling device according to claim 1, characterized in that: The tower body is provided with an inward-facing guide plate below the filler.

8. The aerobic pool aeration air cooling device according to claim 1, characterized in that: The tower body is arranged on a concrete base.

9. The aerobic pool aeration air cooling device according to any one of claims 1 to 8, characterized in that: The pipeline heat exchanger includes a main pipe at both ends, an air distribution plate and a plurality of branch pipes. The plurality of branch pipes are connected to the main pipe through the air distribution plates respectively, and heat dissipation fins are evenly arranged on the outside of the branch pipes.

10. The aerobic pool aeration air cooling device according to any one of claims 1 to 8, characterized in that: The pipeline heat exchanger includes a plurality of branch pipes, and the branch pipes are connected in series.

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