Distillation and air floatation treatment device for waste mineral oil

Abstract

The utility model discloses a waste mineral oil distillation air flotation treatment device and relates to the technical field of waste mineral oil treatment. The utility model aims to solve the problems of limited filtering effect and flow rate caused by blockage, low regeneration efficiency and filtering process of the conventional waste mineral oil regeneration device. The device comprises a treatment tank body, a distillation dehydration unit and a rotational flow air flotation unit, the distillation dehydration unit and the rotational flow air flotation unit are sequentially arranged in the treatment tank body from top to bottom, and a high-temperature steam outlet, a pressure relief hole and a liquid level sensor are arranged on a sealing cover at the upper end of the treatment tank body. A waste mineral oil inlet, a heat-conducting oil outlet, a heat-conducting oil inlet, a microbubble inlet and a treated oil outlet are sequentially formed in the side wall of the treatment tank body from top to bottom, a water outlet is formed in the bottom of the treatment tank body, and the distillation dehydration unit is communicated with the rotational flow air flotation unit. The device is used for waste mineral oil distillation air floatation treatment.

Description

Technical Field

[0001] This utility model relates to the field of waste mineral oil treatment technology, specifically to a waste mineral oil distillation flotation treatment device. Background Technology

[0002] With the continuous progress of my country's economy and society, various types of waste mineral oil are inevitably generated in industrial production and daily life. The resource utilization of waste mineral oil has become a significant environmental issue facing industrial development at this stage. Waste mineral oil refers to mineral oil extracted and refined from petroleum, coal, and oil shale. During the mining, processing, and use processes, external factors such as moisture in the air and water absorption due to inadequate sealing of equipment alter its original physical and chemical properties, rendering it unusable. Waste mineral oil causes severe pollution to soil and water; 1 liter of waste oil can pollute 1 million liters of water. In reality, the proportion of altered components in waste mineral oil is very small, ranging from 20% to 40%, while base oil accounts for 60% to 80%. Therefore, waste mineral oil has high recycling value, and its resource utilization can address the ever-increasing volume of waste oil and energy demands.

[0003] Currently, waste mineral oil can be regenerated through technologies such as sulfuric acid-clay process, membrane treatment process, and hydrorefining process. However, due to the high viscosity and high water content of waste mineral oil, the waste mineral oil regeneration device is clogged, the regeneration efficiency is low, and the filtration process has problems such as limited filtration effect and limited flow.

[0004] Therefore, we propose a waste mineral oil distillation flotation treatment device that innovatively combines distillation dehydration and cyclone flotation to achieve good results, high efficiency, and high benefits, thereby meeting the national emission standards for waste mineral oil. Utility Model Content

[0005] In order to solve the problems of clogging, low regeneration efficiency and limited filtration effect and flow rate in existing waste mineral oil regeneration devices, this utility model proposes a waste mineral oil distillation flotation treatment device.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0007] A waste mineral oil distillation flotation treatment device includes a treatment tank, a distillation and dehydration unit, and a cyclone flotation unit. The distillation and dehydration unit and the cyclone flotation unit are arranged sequentially from top to bottom in the treatment tank. The upper end of the treatment tank is equipped with a high-temperature steam outlet, a pressure relief hole, and a liquid level sensor. The side wall of the treatment tank is provided with a waste mineral oil inlet, a heat transfer oil outlet, a microbubble inlet, and a treated oil outlet sequentially from top to bottom. The bottom of the treatment tank is equipped with a water outlet. The high-temperature steam outlet, pressure relief hole, liquid level sensor, waste mineral oil inlet, heat transfer oil outlet, and heat transfer oil outlet are respectively located in the distillation and dehydration unit. The microbubble inlet, treated oil outlet, and water outlet are respectively located in the cyclone flotation unit. The distillation and dehydration unit and the cyclone flotation unit are connected.

[0008] Furthermore, the distillation and dehydration unit includes a heating tube, an upper partition, a lower partition, a heating tube inlet, and a heating tube outlet. The upper and lower partitions are horizontally arranged from top to bottom inside the processing tank. The circumferential edges of the upper and lower partitions are fixed to the inner sidewall of the processing tank. The heating tube is arranged between the upper and lower partitions. One end of the heating tube has a heating tube inlet, and the other end has a heating tube outlet. The heating tube inlet is connected to the heat transfer oil inlet, and the heating tube outlet is connected to the heat transfer oil outlet. The high-temperature steam outlet, pressure relief hole, and liquid level sensor pass through the cover and the upper partition, respectively. The high-temperature steam outlet, pressure relief hole, liquid level sensor, and waste mineral oil inlet are connected to the enclosed area of ​​the upper partition, the lower partition, and the inner sidewall of the processing tank.

[0009] Furthermore, the heating element is a U-shaped heating element assembly.

[0010] Furthermore, the cyclone flotation unit includes a hydrocyclone and an oil overflow plate. The hydrocyclone is coaxially mounted with the treatment tank at the lower end of the lower baffle, and the oil overflow plate is located outside the hydrocyclone. The hydrocyclone includes a central riser, multiple water distribution pipes, and multiple guide vanes. The central riser is vertically inserted into the middle of the lower baffle, and its upper end is connected to the area enclosed by the upper baffle, the lower baffle, and the inner wall of the treatment tank. The lower end of the central riser is closed. The multiple water distribution pipes are evenly distributed along the circumference of the central riser. The outer side of the lower part of the central riser and the inner end of the water distribution pipe are connected to the interior of the central riser. A guide vane is installed below the outer end of the water distribution pipe. The oil overflow plate is a cylindrical shape with open ends. The oil overflow plate is coaxially arranged with the central riser. A circular bottom plate is fixed between the lower end of the oil overflow plate and the inner wall of the treatment tank. A gap is provided between the upper end of the oil overflow plate and the lower partition. The microbubble inlet and the treated oil outlet are respectively connected to the area enclosed by the oil overflow plate, the circular bottom plate and the inner wall of the treatment tank.

[0011] Furthermore, the water distribution pipe is L-shaped, with its inner end tangential to the wall of the central riser, the lower part of the outer end of the water distribution pipe fixed to the upper part of one end of the guide vane, and the other end of the guide vane being a cantilever end.

[0012] Furthermore, the guide vane is in the shape of an arc strip, and the guide vane is spirally inclined upward from the connecting end to the cantilever end.

[0013] Furthermore, the number of water distribution pipes and guide vanes is three each.

[0014] Furthermore, a support frame is provided below the processing tank.

[0015] Furthermore, the support frame includes four support legs evenly distributed along the circumference, and the upper ends of the support legs are fixed to the processing tank body by fixing bolts and angle brackets.

[0016] Furthermore, an inspection inlet is provided on the side wall of the processing tank.

[0017] The beneficial effects of this utility model compared with the prior art are:

[0018] 1. In use, the distillation and dehydration unit of this invention employs a U-shaped tube heat exchanger in a semi-circular tube configuration, providing sufficient space for the heat exchange zone and the steam zone. A liquid level sensor enables automatic detection, control, and recording of the liquid level. After high-temperature distillation in the distillation and dehydration unit, the viscosity and water content of the waste mineral oil decrease, significantly increasing its fluidity and facilitating oil-water separation by the cyclone flotation unit. This effectively improves bubble adhesion rate and separation efficiency.

[0019] 2. In use, the waste mineral oil from distillation and dehydration processes flows tangentially into the device through the central riser and distribution pipe, and spirals upward under the guidance of guide vanes. Microbubbles and oil droplets adhere to each other in the swirling centrifugal field, forming an adhering mass that accelerates its rise into the overflow plates at both ends, and is discharged through the treated oil outlet. The uniformity of the flow field distribution is enhanced, the effective flotation particle size limit is small, the separation time is short, and it has good oil-water separation efficiency.

[0020] 3. In order to create a relatively sealed chamber within the tank during the waste mineral oil treatment process, the cap is an elliptical head, which achieves the same strength as the tank body. This type of cap is relatively easy to manufacture; therefore, the elliptical head is chosen for this invention.

[0021] 4. This utility model innovatively combines a distillation and dehydration unit with a cyclone flotation unit, which effectively saves floor space, has a compact structure, and improves the waste mineral oil treatment rate.

[0022] 5. The processing tank, distillation and dehydration unit, and cyclone flotation unit provided by this utility model have simple structure and reasonable design, and have good treatment effect on waste mineral oil. They are conducive to ensuring smooth discharge after oil-water separation, and at the same time achieve the purpose of energy recovery and energy conservation and emission reduction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the cyclone separator in this utility model. Detailed Implementation

[0026] To make the technical problems solved, the technical solutions, and the beneficial effects of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0027] Specific implementation method one: Combining Figures 1 to 3 This embodiment describes a waste mineral oil distillation flotation treatment device comprising a treatment tank 1, a distillation dehydration unit 7, and a cyclone flotation unit 2. The distillation dehydration unit 7 and the cyclone flotation unit 2 are arranged sequentially from top to bottom inside the treatment tank 1. The upper end of the treatment tank 1 has a cover 11 with a high-temperature steam outlet 24, a pressure relief hole 13, and a liquid level sensor 12. The side wall of the treatment tank 1 has, from top to bottom, a waste mineral oil inlet 23, a heat transfer oil outlet 14, a heat transfer oil inlet 15, a microbubble inlet 16, and a treated oil outlet 22. The bottom of the treatment tank 1 has a water outlet 20. The high-temperature steam outlet 24, pressure relief hole 13, liquid level sensor 12, waste mineral oil inlet 23, heat transfer oil outlet 14, and heat transfer oil inlet 15 are respectively located in the distillation dehydration unit 7. The microbubble inlet 16, treated oil outlet 22, and water outlet 20 are respectively located in the cyclone flotation unit 2. The distillation dehydration unit 7 and the cyclone flotation unit 2 are connected.

[0028] Waste mineral oil enters the distillation and dehydration unit 7 through the waste mineral oil inlet. Heat transfer oil enters through the heat transfer oil inlet 15 and passes through the heating tubes 6 in the distillation and dehydration unit 7, where the waste mineral oil undergoes high-temperature distillation. The generated high-temperature steam is discharged through the high-temperature steam outlet 24 at the top of the treatment tank 1. Heat transfer oil, which loses heat with the flow of the tubes, is discharged through the heat transfer oil outlet 14. The waste mineral oil, after heating and dehydration, enters the cyclone flotation unit 2. The distilled and dehydrated waste mineral oil passes through the cyclone flotation unit 2 and is discharged through the treated oil outlet 22. The water separated from the oil is discharged from the water outlet 20.

[0029] Specific Implementation Method Two: Combining Figures 1 to 2This embodiment describes a distillation and dehydration unit 7 comprising a heating tube 6, an upper partition 8, a lower partition 5, a heating tube inlet 10, and a heating tube outlet 9. The upper partition 8 and the lower partition 5 are horizontally arranged from top to bottom inside the processing tank 1, with their circumferential edges fixed to the inner sidewall of the processing tank 1. The heating tube 6 is positioned between the upper partition 8 and the lower partition 5, with one end of the heating tube having a heating tube inlet 10 and the other end having a heating tube outlet 9. The heating tube inlet 10 is connected to the heat transfer oil inlet 15, and the heating tube outlet 9 is connected to the heat transfer oil outlet 14. The high-temperature steam outlet 24, the pressure relief hole 13, and the liquid level sensor 12 pass through the cover 11 and the upper partition 8, respectively, and the high-temperature steam outlet 24, the pressure relief hole 13, the liquid level sensor 12, and the waste mineral oil inlet 23 are connected to the enclosed area of ​​the upper partition 8, the lower partition 5, and the inner sidewall of the processing tank 1. The undisclosed technical features in this embodiment are the same as those in Specific Embodiment 1.

[0030] The distillation and dehydration unit 7 includes a heating tube 6, a liquid level sensor 12, an upper partition 8, and a lower partition 5. The waste mineral oil inlet 23 is connected to the distillation and dehydration unit 7. The heat transfer oil inlet 15 and outlet 14 are connected to the heating tube inlet 10 and outlet 9, respectively. After heating and dehydration, the waste mineral oil enters the cyclone flotation unit 2 through the lower partition 5. The generated high-temperature steam is discharged through the high-temperature steam outlet 24 at the top of the treatment tank 1. The liquid level sensor 12 is fixed to the upper partition 8 to monitor the liquid level in the heating area.

[0031] Specific implementation method three: Combining Figures 1 to 2 This embodiment describes a U-shaped heating tube assembly as the heating tube 6. The undisclosed technical features in this embodiment are the same as in specific embodiment two.

[0032] This design provides sufficient space for the heating and steam zones.

[0033] Specific implementation method four: Combination Figures 1 to 3This embodiment describes a cyclone flotation unit 2 comprising a hydrocyclone 3 and an oil overflow plate 4. The hydrocyclone 3 is coaxially mounted with the treatment tank 1 at the lower end of the lower baffle 5. The oil overflow plate 4 is located outside the hydrocyclone 3. The hydrocyclone 3 includes a central riser 31, multiple water distribution pipes 32, and multiple guide vanes 33. The central riser 31 is vertically inserted into the middle of the lower baffle 5, and its upper end is connected to the area enclosed by the upper baffle 8, the lower baffle 5, and the inner wall of the treatment tank 1. The lower end of the central riser 31 is closed. The multiple water distribution pipes 32 are evenly distributed along the circumferential direction. The water distribution pipe 32 is located on the outer side of the lower part of the central riser 31. The inner end of the water distribution pipe 32 is connected to the interior of the central riser 31. A guide vane 33 is provided below the outer end of the water distribution pipe 32. The oil overflow plate 4 is cylindrical with open ends. The oil overflow plate 4 is coaxially arranged with the central riser 31. A circular bottom plate 41 is fixed between the lower end of the oil overflow plate 4 and the inner wall of the treatment tank 1. A gap is provided between the upper end of the oil overflow plate 4 and the lower partition plate 5. The microbubble inlet 16 and the treated oil outlet 22 are respectively connected to the area enclosed by the oil overflow plate 4, the circular bottom plate 41, and the inner wall of the treatment tank 1. The undisclosed technical features in this embodiment are the same as those in specific embodiment two.

[0034] The cyclone flotation unit 2 includes a hydrocyclone 3 and an oil overflow plate 4. The hydrocyclone 3 includes a central riser 31, a water distribution pipe 32, and guide vanes 33. The central riser 31 is located on the central axis of the treatment tank 1, with its lower end closed and three water distribution pipes 32 distributed on its side. Microbubbles adhere to and float with oil droplets, thereby achieving oil-water separation.

[0035] Specific Implementation Method Five: Combining Figures 2 to 3 In this embodiment, the water distribution pipe 32 is L-shaped. The inner end of the water distribution pipe 32 is tangential to the wall of the central riser pipe 31. The lower part of the outer end of the water distribution pipe 32 is fixedly connected to the upper part of one end of the guide vane 33. The other end of the guide vane 33 is a cantilever end. The undisclosed technical features in this embodiment are the same as those in specific embodiment four.

[0036] The water distribution pipe 32 is tangent to the lower end of the cylindrical wall of the central riser pipe 31. A guide vane 33 is provided below the water distribution pipe 32 to facilitate the formation of a swirling flow after the fluid flows out through the tangential water distribution pipe 32.

[0037] Specific Implementation Method Six: Combination Figure 2 and Figure 3 In this embodiment, the guide vane 33 is arc-shaped and spirally inclined upwards from the connecting end to the cantilever end. The undisclosed technical features in this embodiment are the same as in specific embodiment five.

[0038] This design maintains the swirling intensity in the swirling flotation zone and effectively avoids the dragging effect of the underflow outlet on the flow field.

[0039] Specific implementation method seven: Combination Figure 2 and Figure 3 This embodiment describes a system where the number of water distribution pipes 32 and guide vanes 33 are both three. The undisclosed technical features in this embodiment are the same as in specific embodiment six.

[0040] Specific implementation method eight: Combination Figure 1 and Figure 2 This embodiment describes a support frame 19 located below the processing tank 1. The undisclosed technical features in this embodiment are the same as in specific embodiment one.

[0041] Specific Implementation Method Nine: Combining Figure 1 and Figure 2 This embodiment describes a support frame 19 comprising four support legs evenly distributed along the circumference. The upper ends of the support legs are fixed to the processing tank 1 via fixing bolts 18 and angle brackets 17. The undisclosed technical features in this embodiment are the same as in specific embodiment eight.

[0042] The support frame 19 is used to support the processing tank 1 so that the processing tank 1 can be fixedly placed on the ground.

[0043] Specific Implementation Method Ten: Combining Figure 1 This embodiment describes a process tank 1 with a maintenance inlet 21 on its side wall. The undisclosed technical features in this embodiment are the same as in specific embodiment one.

[0044] Inspection port 21 is provided for later cleaning of the inside of the treatment tank 1 or maintenance and repair of related components inside the treatment tank 1.

[0045] Working principle

[0046] A cover 11 is installed at the opening of the tank body 1. A high-temperature steam outlet 24, a pressure relief hole 13, and a liquid level sensor 12 are installed on the cover 11. A support frame 19 is fixedly installed around the bottom of the tank body 1, and a water outlet 20 is installed at the bottom. From top to bottom, the side wall of the tank body 1 is equipped with a waste mineral oil inlet 23, a heat transfer oil outlet 14, a heat transfer oil inlet 15, a microbubble inlet 16, and a treated oil outlet 22. An inspection inlet 21 is also provided on the side wall. A distillation and dehydration unit 7 is installed at the top of the treatment tank body 1, and a cyclone flotation unit 2 is installed inside. Appropriate valves can be installed at the waste mineral oil inlet 23, heat transfer oil inlet 15, heat transfer oil outlet 14, microbubble inlet 16, and treated oil outlet 22 to reasonably control their opening and closing.

[0047] The cover 11 is used to open the tank 1, ensuring that the interior of the tank 1 is a relatively sealed chamber during the waste mineral oil treatment stage. The access port 21 allows for later cleaning of the interior of the tank 1 or maintenance of its internal components. The pressure relief port 12 prevents excessive pressure inside the tank 1 from causing danger. The support frame 19 supports the tank 1, allowing it to be securely placed on the ground.

[0048] Figure 2 In the process, the distillation and dehydration unit 7 includes a heating tube 6, a liquid level sensor 12, an upper partition 8, and a lower partition 5. The waste mineral oil inlet 23 is connected to the distillation and dehydration unit 7. The heat transfer oil inlet 15 and outlet 14 are connected to the heating tube inlet 10 and outlet 9, respectively. After heating and dehydration, the waste mineral oil enters the central tube 31 of the cyclone flotation unit 2 through the lower partition 5. The generated high-temperature steam is discharged through the high-temperature steam outlet 24 at the top of the treatment tank 1. The liquid level sensor 12 is fixed to the upper partition 8 to monitor the liquid level in the heating area.

[0049] Figure 2 and Figure 3 In this process, the cyclone flotation unit 2 includes a hydrocyclone 3 and an oil overflow plate 4. The hydrocyclone 3 includes a central riser 31, water distribution pipes 32, and guide vanes 33. The central riser 31 is located on the central axis of the treatment tank 1, with its lower end closed and three water distribution pipes 32 distributed on its side. The water distribution pipes 32 are tangent to the lower cylindrical wall of the central riser 31. Guide vanes 33 are installed below the water distribution pipes 32. Microbubbles adhere to and float oil droplets, thereby achieving oil-water separation.

[0050] During operation: Waste mineral oil enters the distillation and dehydration unit 7 through the waste mineral oil inlet. Heat transfer oil enters the heat transfer oil inlet 15 as the heating medium for the U-shaped tube, performing high-temperature distillation on the waste mineral oil. The generated high-temperature steam is discharged through the high-temperature steam outlet 24 at the top of the treatment tank 1. Heat transfer oil, which loses heat as it flows through the tubes, is discharged through the heat transfer oil outlet 14. The waste mineral oil, after heating and dehydration, enters the central riser 31 of the cyclone flotation unit 2 through the lower baffle 5. The distilled and dehydrated waste mineral oil flows tangentially into the device through the water distribution pipe 32 via the central riser 31 and slowly spirals upward under the guidance of the guide vanes 33. Microbubbles and oil droplets adhere in the cyclone centrifugal field, forming an adhesive mass that accelerates and floats into the overflow plates 4 on both sides, and is discharged through the treated oil outlet 22. The water separated from the oil is discharged from the water outlet 20.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A waste mineral oil distillation flotation treatment device, characterized in that: The tank includes a treatment tank (1), a distillation and dehydration unit (7), and a cyclone flotation unit (2). The distillation and dehydration unit (7) and the cyclone flotation unit (2) are arranged in the treatment tank (1) from top to bottom. The cover (11) at the top of the treatment tank (1) is equipped with a high-temperature steam outlet (24), a pressure relief hole (13), and a liquid level sensor (12). The side wall of the treatment tank (1) is equipped with a waste mineral oil inlet (23), a heat transfer oil outlet (14), a heat transfer oil inlet (15), and a microbubble inlet (16) from top to bottom. 6) and the processing oil outlet (22), the bottom of the processing tank (1) is provided with a water outlet (20), a high temperature steam outlet (24), a pressure relief hole (13), a liquid level sensor (12), a waste mineral oil inlet (23), a heat transfer oil outlet (14) and a heat transfer oil inlet (15) are respectively provided in the distillation and dehydration unit (7), the microbubble inlet (16), the processing oil outlet (22) and the water outlet (20) are respectively provided in the cyclone flotation unit (2), and the distillation and dehydration unit (7) is connected to the cyclone flotation unit (2).

2. The waste mineral oil distillation flotation treatment device according to claim 1, characterized in that: The distillation and dehydration unit (7) includes a heating tube (6), an upper partition (8), a lower partition (5), a heating tube inlet (10), and a heating tube outlet (9). The upper partition (8) and the lower partition (5) are horizontally arranged from top to bottom inside the processing tank (1). The circumferential edges of the upper partition (8) and the lower partition (5) are fixed to the inner sidewall of the processing tank (1). The heating tube (6) is arranged between the upper partition (8) and the lower partition (5). One end of the heating tube (6) is provided with a heating tube inlet (10), and the other end of the heating tube (6) is provided with a heating tube outlet (9). A heating pipe outlet (9) is provided, a heating pipe inlet (10) is connected to a heat transfer oil inlet (15), a heating pipe outlet (9) is connected to a heat transfer oil outlet (14), a high-temperature steam outlet (24), a pressure relief hole (13) and a liquid level sensor (12) pass through a cover (11) and an upper partition (8) respectively, and the high-temperature steam outlet (24), the pressure relief hole (13), the liquid level sensor (12) and the waste mineral oil inlet (23) are connected to the enclosed area of ​​the upper partition (8), the lower partition (5) and the inner wall of the treatment tank (1) respectively.

3. The waste mineral oil distillation flotation treatment device according to claim 2, characterized in that: The heating tube (6) is a U-shaped heating tube assembly.

4. The waste mineral oil distillation flotation treatment device according to claim 2, characterized in that: The cyclone flotation unit (2) includes a cyclone separator (3) and an oil overflow plate (4). The cyclone separator (3) is coaxially arranged with the treatment tank (1) at the lower end of the lower partition plate (5). The oil overflow plate (4) is arranged on the outside of the cyclone separator (3). The cyclone separator (3) includes a central riser (31), multiple water distribution pipes (32) and multiple guide vanes (33). The central riser (31) is vertically inserted into the middle of the lower partition plate (5), and the upper end of the central riser (31) is connected to the area enclosed by the upper partition plate (8), the lower partition plate (5) and the inner wall of the treatment tank (1). The lower end of the central riser (31) is closed. Multiple water distribution pipes (32) are evenly distributed in the center along the circumferential direction. The lower outer side of the riser (31) and the inner end of the water distribution pipe (32) are connected to the interior of the central riser (31). A guide vane (33) is provided below the outer end of the water distribution pipe (32). The shape of the oil overflow plate (4) is a cylindrical shape with open ends. The oil overflow plate (4) is coaxially arranged with the central riser (31). A circular bottom plate (41) is fixed between the lower end of the oil overflow plate (4) and the inner wall of the treatment tank (1). A gap is provided between the upper end of the oil overflow plate (4) and the lower partition plate (5). The microbubble inlet (16) and the treated oil outlet (22) are connected to the enclosed area of ​​the oil overflow plate (4), the circular bottom plate (41) and the inner wall of the treatment tank (1), respectively.

5. The waste mineral oil distillation flotation treatment device according to claim 4, characterized in that: The water distribution pipe (32) is L-shaped. The inner end of the water distribution pipe (32) is tangential to the wall of the central riser pipe (31). The lower part of the outer end of the water distribution pipe (32) is fixedly connected to the upper part of one end of the guide vane (33). The other end of the guide vane (33) is a cantilever end.

6. The waste mineral oil distillation flotation treatment device according to claim 5, characterized in that: The guide vane (33) is in the shape of an arc strip, and the guide vane (33) is spirally inclined from the connecting end to the cantilever end.

7. The waste mineral oil distillation flotation treatment device according to claim 6, characterized in that: The number of water distribution pipes (32) and guide vanes (33) is three each.

8. The waste mineral oil distillation flotation treatment device according to claim 1, characterized in that: A support frame (19) is provided below the processing tank (1).

9. The waste mineral oil distillation flotation treatment device according to claim 8, characterized in that: The support frame (19) includes four support legs evenly distributed along the circumference. The upper ends of the support legs are fixed to the processing tank (1) by fixing bolts (18) and corner brackets (17).

10. The waste mineral oil distillation flotation treatment device according to claim 1, characterized in that: The processing tank (1) has a maintenance inlet (21) on its side wall.

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