Anti-freezing device for air floatation tank

Abstract

The utility model provides an air floatation tank anti-freezing device, and belongs to the field of sewage treatment equipment.The air floatation tank anti-freezing device comprises an air floatation tank, an isolation supporting plate, a conveying pipe, a supporting frame and a stirring shaft, a heat preservation layer is arranged on the outer surface of the air floatation tank, an electric heating wire is arranged between the heat preservation layer and the outer wall of the air floatation tank, and the isolation supporting plate is arranged in the middle of the bottom of the air floatation tank; a conveying pipe is arranged in the center of the isolation supporting plate, the top of the isolation supporting plate is movably connected with a supporting frame, a filtering barrel is arranged below the supporting frame, a propeller is arranged in the air floatation tank, a stirring shaft is arranged between the isolation supporting plate and the side wall of the air floatation tank, and an ultrasonic generator is arranged at the bottom of the air floatation tank. The anti-freezing device has the beneficial effects that the air floatation tank is prevented from freezing, and equipment is prevented from freezing.

Description

Technical Field

[0001] The present invention belongs to the field of sewage treatment equipment, and specifically relates to an anti-freezing device for an air flotation tank. Background Art

[0002] In sewage treatment equipment, for the purification treatment of water supply with low turbidity, many algae, low temperature, high chromaticity, and low dissolved oxygen, an air flotation tank is usually used. The air flotation tank promotes the formation and growth of flocs and adheres them through microbubbles, and then filters impurities through separation.

[0003] Although the air flotation tank can efficiently separate solid particles, in the northern region, due to the extremely cold winter, the air flotation tank is very prone to freezing problems. The operating temperature of the air flotation tank cannot be lower than 0 °C. When the temperature is lower than 0 °C, the water body will freeze, resulting in a significant decline in the flocculation or air flotation effect. Too low temperature will also cause a significant decline in the gas dissolution effect, thus affecting the sewage treatment effect, and may also cause the anti-corrosion coating and the outer paint film to freeze and crack. Currently, in the northern region, for winter anti-freezing, mostly shutdown or continuous operation is adopted, and heat preservation materials need to be added. Neither shutdown nor continuous operation is the optimal solution. Shutdown will cause sewage treatment to stop, and continuous operation will accelerate equipment aging and energy waste. External heat preservation is only for storage during shutdown for winter, which has no significant effect in the northern region. The winter temperature in the north can reach as low as minus twenty or thirty degrees, and in this case, the air flotation tank is very likely to freeze, affecting the impurity removal and filtration of the air flotation tank.

[0004] Therefore, there is a need for a device that can solve the above problems now. Summary of the Invention

[0005] The present invention provides an anti-freezing device for an air flotation tank that prevents the air flotation tank from freezing and prevents equipment from freezing, especially suitable for air flotation tank equipment in sewage treatment. The technical problem to be solved is: the problem that the air flotation tank freezes in winter.

[0006] The technical solution adopted by the present invention is:

[0007] An anti-freezing device for an air flotation tank includes an air flotation tank, an isolation support plate, a delivery pipe, a support frame, and a stirring shaft. A heat preservation layer is arranged on the outer surface of the air flotation tank, an electric heating wire is arranged between the heat preservation layer and the outer wall of the air flotation tank. An isolation support plate is arranged in the middle of the bottom of the air flotation tank, a delivery pipe is arranged at the center of the isolation support plate, the top of the isolation support plate is movably connected to the support frame, a filter bucket is arranged below the support frame, a propeller is arranged inside the air flotation tank, a stirring shaft is arranged between the isolation support plate and the side wall of the air flotation tank, and an ultrasonic generator is arranged at the bottom of the air flotation tank.

[0008] Further, an aeration cylinder is arranged at the bottom of the delivery pipe, a plurality of aeration cylinders are arranged side by side, and the air outlet holes of the aeration cylinders are located at the bottom of the air flotation tank.

[0009] Furthermore, a heat pipe is arranged outside the aeration cylinder.

[0010] Furthermore, the heat pipe is spirally wound around the outside of the aeration cylinder.

[0011] Furthermore, stirring blades are arranged outside the stirring shaft, and a plurality of stirring blades are evenly arranged around the stirring shaft. The stirring blades are straight plate blades.

[0012] Furthermore, the stirring shaft is located on the side of the conveying pipe away from the support frame, the propeller is located in the middle of the air flotation tank, the conveying direction of the propeller is towards the direction where the conveying pipe is located, and a baffle is arranged above the propeller.

[0013] Furthermore, arc-shaped blades are arranged outside the filter barrel.

[0014] Furthermore, a plurality of propellers are arranged side by side.

[0015] After adopting the above structure, the following beneficial effects are achieved:

[0016] 1. Since the stirring blades are used in cooperation with the propeller to promote the water flow circulation, and at the same time, the stirring blades can quickly stir and agitate the water surface, the problem that the liquid surface is prone to freezing at minus temperature is overcome. As a result, the liquid in the air flotation tank will not freeze into an ice surface, and the pollutants can be removed well during the air flotation process, avoiding the ice layer from reducing the air flotation effect and the impurity removal effect.

[0017] 2. Since the conveying pipe is used in cooperation with the heat pipe to convey the aerated liquid to the bottom of the air flotation tank, the problem that the infusion pipe freezes at minus temperature is overcome, and at the same time, the problem that the gas is not easily precipitated at too low temperature, resulting in a decline in the air flotation effect, is overcome. Thus, the effect of gas precipitation is ensured, and the effect of the air flotation work is guaranteed.

[0018] 3. Since the air flotation tank is used in cooperation with the heat preservation layer to insulate the side wall of the air flotation tank, the problem that the liquid is prone to freeze starting from the position close to the side wall is overcome. As a result, the internal water flow is smoother, avoiding local pollution freezing and ensuring the working quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the top view of the present invention;

[0020] Figure 2 is the perspective view of the present invention;

[0021] Figure 3 is the perspective Figure 2 ;

[0022] Figure 4 is the front view of the present invention.

[0023] In the figure:

[0024] 1. Air flotation tank; 2. Isolation support plate; 3. Delivery pipe; 4. Support frame; 5. Stirring shaft; 6. Thermal insulation layer; 7. Ultrasonic generator; 8. Propeller; 9. Stirring blade; 10. Heat pipe; 11. Filter barrel; 12. Aeration cylinder. Specific embodiments

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] As Figures 1-4 shown:

[0027] An air flotation tank anti-freezing device, comprising an air flotation tank 1, an isolation support plate 2, a delivery pipe 3, a support frame 4 and a stirring shaft 5. A heat preservation layer 6 is arranged on the outer surface of the air flotation tank 1, and an electric heating wire is arranged between the heat preservation layer 6 and the outer wall of the air flotation tank 1. The electric heating wire and the heat preservation layer 6 are used to ensure the temperature of the side wall of the air flotation tank 1, avoiding the freezing of pollutants in the air flotation tank 1 starting from the side wall due to too low side wall temperature. An isolation support plate 2 is arranged in the middle of the bottom of the air flotation tank 1. The isolation support plate 2 is a cylindrical isolation plate. The isolation support plate 2 and the side wall of the air flotation tank 1 can be used as a guide rail, and at the same time, it is convenient to support the upper structure and facilitate the setting of standby equipment above the isolation support plate 2. A delivery pipe 3 is arranged at the center of the isolation support plate 2. An aeration cylinder 12 is arranged at the bottom of the delivery pipe 3, and an aeration device is arranged at the bottom end of the aeration cylinder 12. A plurality of aeration cylinders 12 are arranged side by side. A heat pipe 10 is arranged outside the aeration cylinder 12. The heat pipe 10 is spirally wound around the outside of the aeration cylinder 12. The heat pipe 10 adopts an electric heating pipe or a warm water pipe. The aeration cylinder 12 is heated by the heat pipe to ensure the gas precipitation rate of the aerated water, overcome the reduction of gas precipitation ability caused by too low temperature, and can also indirectly heat the liquid in the air flotation tank 1 to further avoid the problem of working icing. The top of the isolation support plate 2 is slidably connected to the support frame 4 through a slider. One end of the support frame 4 away from the isolation support plate 2 is slidably connected to the top of the side wall of the air flotation tank 1 through a slider. The isolation support plate 2 can slide through the slider, so as to adjust the position of the isolation support plate 2. A filter barrel 11 is rotatably connected to the lower part of the support frame 4 through a vertical side plate. An arc-shaped blade is arranged outside the filter barrel 11. The arc-shaped blade can centrally collect the pollutants floating on the surface and discharge them through the filter barrel 11. The inside of the filter barrel 11 is hollow and connected to a sewage discharge pipe. A propeller 8 is arranged inside the air flotation tank 1. A plurality of propellers 8 are arranged side by side. The propeller 8 can accelerate the liquid flow rate inside the air flotation tank 1, so that the liquid molecules remain active and avoid freezing by physical methods. A stirring shaft 5 is arranged between the isolation support plate 2 and the side wall of the air flotation tank 1. Stirring blades 9 are arranged outside the stirring shaft 5. A plurality of stirring blades 9 are evenly arranged around the stirring shaft 5. The stirring blades 9 are straight plate blades. The stirring blades 9 are used to stir the surface water body. Because the surface is more likely to freeze, stirring the surface water body can not only avoid freezing by physical methods, but also break a very small amount of floating ice to avoid the influence of a small amount of thin ice on the air flotation work. An ultrasonic generator 7 is arranged at the bottom of the air flotation tank 1.

[0028] The stirring shaft 5 is located away from the support frame 4 of the conveying pipe 3. The stirring blades 9 outside the stirring shaft 5 are used to stir the liquid, so that the liquid keeps moving and stirring, and can also break the thin ice on the surface, thereby avoiding the freezing of the liquid by physical means. The propeller 8 is located in the middle of the air flotation tank 1, and the conveying direction of the propeller 8 is towards the direction where the conveying pipe 3 is located. A baffle is arranged above the propeller 8. The propeller 8 is used to accelerate the liquid flow inside the air flotation tank 1, avoid the freezing of the liquid by promoting the liquid flow, and the baffle can block the circulation of surface stains. The surface stains are concentrated at the position of the filter barrel 11, and most of the stains can be discharged through the filter barrel 11, avoiding the problem of stain circulation.

[0029] The working mode of this example:

[0030] In the air flotation tank 1, the aerated sewage is discharged into the air flotation tank 1 through the conveying pipe 3. Because the temperature is too low in winter, the foam and liquid will freeze, and the gas precipitation effect of air flotation will also be affected. Therefore, the propeller 8 located in the middle of the air flotation tank 1 can make the liquid rotate and flow at an accelerated speed, avoid the freezing caused by too slow liquid flow speed, and the stirring shaft 5 uses the stirring blades 9 to increase the chaos degree of the liquid, avoid the internal freezing of the air flotation tank 1. The propeller 8 and the stirring blades 9 can avoid freezing by physical means, which can well adapt to the northern region. At the same time, the ultrasonic generator can accelerate the molecular vibration, and avoid its freezing due to the continuous vibration of the molecules. The heat pipe can also be used for heating. The heat pipe heating can not only improve the gas precipitation effect of the air flotation tank 1 in winter, improve the air flotation effect, but also make the water temperature not drop to the freezing point. The stains floating on the surface are collected and discharged through the spiral blades of the filter barrel 11, avoiding the excessive accumulation of stains. The baffle can concentrate the stains for discharge through the filter barrel 11, and the gas precipitation can be quickly promoted through the aeration cylinder 12. Compared with the traditional single heating, a large amount of physical anti-freezing is added. When the temperature is not particularly low, accelerating the precipitation and avoiding freezing by physical means can save a large amount of energy. When the temperature is too low, heating and physical stirring are used in combination to improve the working effect of the air flotation tank 1.

[0031] There is an electric heating wire at the heat preservation layer 6, which concentrates the heat on the side wall of the air flotation tank 1, overcomes the problem that the water flow speed decreases significantly near the barrel wall and it is easier to freeze closer to the barrel wall, so that the barrel wall will not freeze, and can also insulate the whole air flotation tank 1, reduce the heating pressure and energy consumption. The above scheme well overcomes the problem of freezing of the air flotation tank in northern winter. By using a large number of physical methods for anti-freezing, it overcomes the problem of secondary pollution of sewage after filtration caused by chemical anti-freezing, avoids the problem of chemical anti-freezing agent becoming a new pollutant, and effectively improves the anti-freezing effect in the north.

[0032] The directional terms mentioned in the present invention, such as "up", "down", "left", "right", etc., are only for better and clearer explanation and understanding of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0033] The above description is about the preferred embodiments of the present invention, but it should not be construed as a limitation to the claims. The present invention is not limited to the above embodiments, and its specific structure allows for variations. All variations made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. An air flotation tank antifreeze device, comprising an air flotation tank (1), an isolation support plate (2), a delivery pipe (3), a support frame (4) and a stirring shaft (5), characterized in that: The outer surface of the flotation tank (1) is provided with a heat-insulating layer (6), an electric heating wire is provided between the heat-insulating layer (6) and the outer wall of the flotation tank (1), an isolation support plate (2) is provided in the middle of the bottom of the flotation tank (1), a conveying pipe (3) is provided in the center of the isolation support plate (2), the top of the isolation support plate (2) is movably connected to a support frame (4), a filter barrel (11) is provided below the support frame (4), a propeller (8) is provided inside the flotation tank (1), a stirring shaft (5) is provided between the isolation support plate (2) and the side wall of the flotation tank (1), and an ultrasonic generator (7) is provided at the bottom of the flotation tank (1).

2. The antifreeze device for a flotation pool according to claim 1, characterized in that: An aeration cylinder (12) is arranged at the bottom of the delivery pipe (3), and a plurality of the aeration cylinders (12) are arranged side by side. The air outlet of the aeration cylinder (12) is located at the bottom of the flotation tank (1).

3. The antifreeze device for a flotation pool according to claim 2, characterized in that: A heat pipe (10) is arranged outside the aeration cylinder (12).

4. The antifreeze device for a flotation pool according to claim 3, characterized in that: The heat pipe (10) is spirally wound around the outside of the aeration cylinder (12).

5. The antifreeze device for a flotation pool according to claim 1, characterized in that: A stirring blade (9) is arranged outside the stirring shaft (5), and a plurality of stirring blades (9) are evenly arranged around the stirring shaft (5), and the stirring blades (9) are straight blades.

6. The antifreeze device for a flotation pool according to claim 1, characterized in that: The stirring shaft (5) is located on the side of the conveying pipe (3) away from the support frame (4), the propeller (8) is located in the middle of the flotation tank (1), the conveying direction of the propeller (8) is toward the direction of the conveying pipe (3), and a baffle is arranged above the propeller (8).

7. The antifreeze device for a flotation pool according to claim 1, characterized in that: Arc-shaped blades are arranged outside the filter barrel (11).

8. The antifreeze device for a flotation pool according to claim 6, characterized in that: A plurality of propellers (8) are arranged side by side.

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