Super-cavitation closed air float device

Abstract

The present application relates to the field of oilfield produced water treatment, and discloses a super cavitation closed air flotation device, which comprises a device body, and a medicine dissolving cavity, a first-stage air flotation cavity, a second-stage air flotation cavity, a third-stage air flotation cavity and a water outlet buffer cavity are sequentially arranged in the device body from front to back and are connected with each other; cavitation assemblies are arranged in the first-stage air flotation cavity, the second-stage air flotation cavity and the third-stage air flotation cavity; the cavitation assemblies comprise a super cavitation release generator, a first ultrasonic orifice plate generator and a hydraulic cavitation gas dissolving reactor; the super cavitation release generator is coaxially arranged in the inside of the water inlet pipe extension end; an ultrasonic generator and a second ultrasonic orifice plate generator are sequentially arranged on the super cavitation release generator, a cavitation cavity is coaxially arranged in the inside of the super cavitation release generator, and the inlet end of the cavitation cavity is connected with a pressurized gas dissolving water pipe. The present application combines super cavitation, ultrasonic waves and air flotation, and does not add or adds less demulsifier, so that aged oil is avoided and a large amount of sludge is not produced.

Description

Technical Field

[0001] This invention relates to the field of oilfield produced water treatment, specifically to a supercavitating closed air flotation device. Background Technology

[0002] Oil-water separation produces a large amount of oily wastewater (oilfield produced water). Oilfield produced water has a very complex composition and is difficult to treat. Common treatment methods include chemical and physical methods. Chemical methods involve adding flocculants and coagulants to precipitate oil and impurities in the wastewater, thus purifying the water. Physical methods involve using oil-water separation equipment to separate and remove water-insoluble oil and suspended solids from oilfield produced water through physical action.

[0003] Oils in produced water from oilfields exist in different forms and can be classified into four categories: floating oil, dispersed oil, emulsified oil, and dissolved oil. Oil floats: Oil films that float on the water surface as a continuous phase, forming an oil film or oil layer. Oil droplets are relatively large, often greater than 100 μm.

[0004] Dispersed oil: It consists of tiny oil droplets suspended and dispersed in an aqueous phase. It is unstable and can aggregate into larger oil droplets, transforming into floating oil. The droplet size is generally 10-100 μm.

[0005] Emulsified oil: Due to the presence of surfactants, the oil forms an emulsion in water, making the system relatively stable. The oil droplets are extremely small, generally less than 10 μm, with most being 0.1–2 μm.

[0006] Dissolved oil: It disperses in water at the molecular level to form a homogeneous oil-water system, which is very stable and generally below 5-15 mg / L. The oil droplets are extremely small, sometimes as small as a few nanometers.

[0007] Oil and dispersed oil with a viscosity greater than 60 μm can be easily separated by gravity. However, dispersed oil and emulsified oil with a viscosity less than 60 μm are difficult to separate by gravity. Generally, it is necessary to add a demulsifier to break up the emulsion system, causing small oil droplets to coagulate into large oil droplets, thereby improving the oil-water separation effect.

[0008] Dissolved air flotation (DAF) is a highly efficient and rapid oil-water separation technology used in oilfield produced water treatment. DAF utilizes the different solubility of water under varying pressures. It pressurizes and aerates all or part of the water to be treated (or treated), increasing the dissolved air content. This air is released under normal pressure, forming small bubbles that adhere to oil droplets. Because the oil droplets are much less dense than water, they rise rapidly, thus separating the oil and water. However, emulsified oil is hydrophilic and does not easily bind to oil droplets, and the adhesion is weak. Therefore, to separate emulsified oil, demulsifiers are still needed to break down the hydration film on the surface of the oil droplets, making them hydrophobic and easier to adhere to the bubbles, thus improving the oil-water separation effect but increasing reagent costs. Furthermore, adding demulsifiers can easily generate aged oil. Aged oil enters the crude oil dehydration system, affecting the dehydration effect, making dehydration more difficult, and increasing the cost of crude oil dehydration.

[0009] Produced water containing polymers and heavy oil has a higher degree of emulsification, requiring higher emulsifier dosages and longer reaction and settling times. Generally, a two-stage oil removal + two-stage air flotation process is needed, with a total retention time of 6-12 hours, yet the treatment effect is still unsatisfactory. Furthermore, when using air flotation, the released gas carries away a large amount of oil and gas, causing VOC pollution. The accompanying oil-free recovery system and sludge treatment system also contribute to environmental pollution. Summary of the Invention

[0010] In view of the above, the present invention provides a supercavitating closed air flotation device to solve the problems mentioned in the background art, and specifically discloses the following: A supercavitation closed-loop air flotation device includes a device body. Inside the device body, from front to back, there are interconnected dissolving chamber, primary air flotation chamber, secondary air flotation chamber, tertiary air flotation chamber, and effluent buffer chamber. The bottom of the effluent buffer chamber is provided with an effluent pipe. The primary air flotation chamber, secondary air flotation chamber, and tertiary air flotation chamber are all provided with cavitation components for cavitating the produced water entering the chamber. The cavitation assembly includes a supercavitation release generator, a first ultrasonic orifice plate generator, and a hydraulic cavitation dissolved gas reactor. The bottom of the primary air flotation chamber is equipped with an inlet pipe, the inlet end of which is sequentially connected to a first ultrasonic orifice plate generator and a hydraulic cavitation dissolved air reactor. A supercavitation release generator is coaxially disposed inside the inlet end of the inlet pipe. An ultrasonic generator and a second ultrasonic orifice plate generator are sequentially disposed on the supercavitation release generator. A cavitation cavity is coaxially disposed inside the supercavitation release generator, and a supercavitation orifice plate is disposed within the cavitation cavity. The inlet end of the cavitation cavity is connected to a pressurized dissolved air water pipe for injecting dissolved air water. The outlet end of the cavitation cavity is connected to the inlet end of the ultrasonic generator. The extracted water in the inlet pipe enters the supercavitation release generator and mixes with the dissolved air water at the outlet end of the cavitation cavity at the ultrasonic generator. The top of the dissolving chamber is provided with a dosing port, and the bottom is connected to the water inlet side of the water inlet pipe through a dosing pipe; The device body is also provided with an oil collection chamber, which is located behind the water outlet buffer chamber. The oil collection chamber is connected to the primary air flotation chamber, the secondary air flotation chamber and the tertiary air flotation chamber through an oil collection component. The bottom of the oil collection chamber is provided with an oil discharge port.

[0011] Furthermore, it also includes a dissolved air device, the water inlet of which is connected to the water outlet buffer chamber, the air inlet of which is connected to the oil collection chamber through a gas return pipe, the output end of which is connected to a bubble filter through a dissolved air pump, and the output end of the bubble filter is connected to three pressurized dissolved air water pipes respectively.

[0012] Furthermore, a flow regulating valve is provided on the pipeline between the dissolved gas pump and the dissolved gas device.

[0013] Furthermore, the water inlet pipe is also equipped with a dosing jet reactor, which is located on the rear side of the connection between the water inlet pipe and the dosing pipe.

[0014] Furthermore, the oil recovery assembly includes an oil recovery pipe, and the top of the primary air flotation chamber, the secondary air flotation chamber, and the tertiary air flotation chamber are all equipped with an electric oil recovery valve and an oil-water interface meter. The three electric oil recovery valves are all connected to the oil recovery chamber through the oil recovery pipe, and the oil-water interface meter is electrically connected to the corresponding electric oil recovery valve.

[0015] Furthermore, the dissolving chamber, the water outlet buffer chamber, and the oil collection chamber are connected by a connecting pipe to balance the pressure inside the chamber.

[0016] Furthermore, it also includes a first water pipe, a second water pipe, and a third water pipe; The inlet end of the first water pipe is located in the first-stage air flotation chamber, and the outlet end extends into the second-stage air flotation chamber and is connected in sequence to the first ultrasonic orifice plate generator and the hydraulic cavitation dissolved air reactor. The ultrasonic cavitation release generator is coaxially arranged inside the inlet end of the first water pipe. The inlet end of the second water pipe is located in the secondary air flotation chamber, and the outlet end extends into the tertiary air flotation chamber and is connected in sequence to the first ultrasonic orifice plate generator and the hydraulic cavitation dissolved air reactor. The ultrasonic cavitation release generator is coaxially arranged inside the inlet end of the second water pipe. The inlet end of the third water pipe is located inside the three-stage air flotation chamber, and the outlet end extends into the water outlet buffer chamber.

[0017] The beneficial effects of this invention are as follows: This invention combines supercavitation, ultrasound, and air flotation. Gas is dissolved in water, causing a cavitation reaction at the gas-liquid interface in a negative pressure zone, where bubbles burst. Simultaneously, ultrasound is added in the negative pressure zone, causing the bubbles to collapse and break down into numerous smaller bubbles. The extremely short time between bubble collapse and the generation of a temperature of approximately 5000K within the bubble enhances the demulsification effect on emulsified oil. The broken-down small bubbles then participate in subsequent air flotation reactions. This invention requires little or no demulsifier, avoiding the formation of aged oil and large amounts of sludge. Multiple stages of pressurized air flotation are used in series within a single device, eliminating the need for pumping of effluent, allowing it to enter the next stage of the process under pressure, shortening the treatment process and reducing oil-water separation time. The gas overflowing from the air flotation is recycled, preventing VOC emissions. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the internal structure of a supercavitating closed air flotation device according to the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the hollowing component in this invention.

[0021] In the figure: 1-Dosing port, 2-Dissolving chamber, 3-First-stage air flotation chamber, 4-Hydraulic cavitation dissolved air reactor, 5-Supercavitation release generator, 51-Ultrasonic generator, 52-Second ultrasonic orifice plate generator, 53-Supercavitation orifice plate, 54-Cavitation chamber, 6-Electric oil recovery valve, 7-Second-stage air flotation chamber, 8-Oil-water interface meter, 9-Third-stage air flotation chamber, 10-Connecting pipe, 11-First ultrasonic orifice plate generator, 12-Outlet buffer chamber, 13-Oil recovery pipe, 14-Oil recovery chamber, 15-Oil outlet, 16-Outlet water pipe, 17-Gas return pipe, 18-Dissolving air device, 19-Pressurized dissolved air water pipe, 20-Flow regulating valve, 21-Dissolving air pump, 22-Bubble screener, 23-Dosing jet reactor, 24-Dosing pipe, 25-Inlet water pipe, 26-First water pipe, 27-Second water pipe, 28-Third water pipe. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the purposes of describing embodiments of this application herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or components is not necessarily limited to those explicitly listed, but may include other steps or components not explicitly listed or inherent to such processes, methods, products, or devices.

[0024] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0025] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0026] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0027] See appendix Figure 1-2This invention discloses a supercavitation closed air flotation device, including a device body. Inside the device body, from front to back, there are interconnected dissolving chamber 2, primary air flotation chamber 3, secondary air flotation chamber 7, tertiary air flotation chamber 9, and effluent buffer chamber 12. The bottom of the effluent buffer chamber 12 is provided with an effluent pipe 16. The primary air flotation chamber 3, secondary air flotation chamber 7, and tertiary air flotation chamber 9 are all provided with cavitation components for cavitating the produced water entering the chamber. The cavitation assembly includes a supercavitation release generator 5, a first ultrasonic orifice plate generator 11, and a hydraulic cavitation dissolved air reactor 4. The bottom of the primary air flotation chamber 3 is provided with an inlet pipe 25, the inlet end of which is connected in sequence to the first ultrasonic orifice plate generator 11 and the hydraulic cavitation dissolved air reactor 4; the supercavitation release generator 5 is coaxially arranged inside the inlet end of the inlet pipe 25; the supercavitation release generator 5 is provided with an ultrasonic generator 51 and a second ultrasonic orifice plate generator 52 in sequence, and the supercavitation release generator 5 is coaxially arranged with a cavitation cavity 54 inside, and a supercavitation orifice plate 53 is arranged inside the cavitation cavity 54; the inlet end of the cavitation cavity 54 is connected to a pressurized dissolved air water pipe 19 for injecting dissolved air water; the outlet end of the cavitation cavity 54 is connected to the inlet end of the ultrasonic generator 51; the extracted water in the inlet pipe 25 enters the supercavitation release generator 5 and mixes with the dissolved air water at the outlet end of the cavitation cavity 54 at the ultrasonic generator 51; The top of the dissolving chamber 2 is provided with a dosing port 1, and the bottom is connected to the water inlet side of the water inlet pipe 25 through a dosing pipe 24; The device body is also equipped with an oil collection chamber 14, which is located behind the water outlet buffer chamber 12. The oil collection chamber 14 is connected to the primary air flotation chamber 3, the secondary air flotation chamber 7 and the tertiary air flotation chamber 9 through the oil collection component. The bottom of the oil collection chamber 14 is equipped with an oil discharge port 15.

[0028] It also includes a dissolved air device 18, the water inlet of the dissolved air device 18 is connected to the water outlet buffer chamber 12, the air inlet of the dissolved air device 18 is connected to the oil collection chamber 14 through the gas return pipe 17, the output end of the dissolved air device 18 is connected to the bubble filter 22 through the dissolved air pump 21, and the output end of the bubble filter 22 is connected to three pressurized dissolved air water pipes 19 respectively.

[0029] A flow regulating valve 20 is installed on the pipeline between the dissolved gas pump 21 and the dissolved gas device 18.

[0030] The inlet pipe 25 is also equipped with a chemical jet reactor 23, which is located on the rear side of the connection between the inlet pipe 25 and the chemical dosing pipe 24.

[0031] The oil recovery assembly includes an oil recovery pipe 13. The top of the primary air flotation chamber 3, the secondary air flotation chamber 7, and the tertiary air flotation chamber 9 are all equipped with electric oil recovery valves 6 and oil-water interface meters 8. The three electric oil recovery valves 6 are all connected to the oil recovery chamber 14 through the oil recovery pipe 13. The oil-water interface meters 8 are electrically connected to the corresponding electric oil recovery valves 6.

[0032] The dissolving chamber 2, the water outlet buffer chamber 12, and the oil collection chamber 14 are connected by a connecting pipe 10 to balance the pressure inside the chambers.

[0033] It also includes a first water pipe 26, a second water pipe 27, and a third water pipe 28; The inlet end of the first water pipe 26 is located in the first-stage air flotation chamber 3, and the outlet end extends into the second-stage air flotation chamber 7 and is connected in sequence to the first ultrasonic orifice plate generator 11 and the hydraulic cavitation dissolved air reactor 4. The supercavitation release generator 5 is coaxially arranged inside the inlet end of the first water pipe 26. The inlet end of the second water pipe 27 is located in the secondary air flotation chamber 7, and the outlet end extends into the tertiary air flotation chamber 9 and is connected in sequence to the first ultrasonic orifice plate generator 11 and the hydraulic cavitation dissolved air reactor 4. The supercavitation release generator 5 is coaxially arranged inside the inlet end of the second water pipe 27. The inlet end of the third water pipe 28 is located inside the third-stage air flotation chamber 9, and the outlet end extends into the outlet buffer chamber 12.

[0034] Working principle: The produced water from the oilfield to be treated flows in through the inlet pipe 25, and after being mixed with the reagent in the dosing jet reactor 23, it flows through the supercavitation release generator 5, the first ultrasonic orifice plate generator 11, and the hydraulic cavitation dissolved air reactor 4 before entering the primary air flotation chamber 3.

[0035] When the produced water passes through the dosing jet reactor 23, a negative pressure zone is formed inside the dosing jet reactor 23, which draws the reagent from the dissolving chamber 2 into the dosing jet reactor 23 and mixes it thoroughly with the produced water.

[0036] The produced water from the mixed reagent mixes with the dissolved air released from the supercavitation release generator 5 in the inlet pipe 25 within the ultrasonic generator 51. Under the action of ultrasound, a local negative pressure zone is formed again inside the liquid, causing the liquid interface to break down. This causes the bubbles to vibrate in the sound field. When the sound pressure is in the negative half-cycle, the liquid is subjected to a large pulling force, and the bubble nucleus expands rapidly, reaching several times its original size. Then, in the positive half-cycle, the bubble is compressed and suddenly collapses, breaking into many small bubbles to form new cavitation nuclei. As the bubble rapidly contracts, the gas or vapor inside the bubble is compressed. In the extremely short time of the cavitation bubble collapse, a high temperature of about 5000K is generated inside the bubble, and a high pressure of about 500 atmospheres is generated locally, accompanied by strong shock waves and strong jets. This creates local high pressure, high temperature, and high gradient flow, enhancing the demulsification effect of the emulsified oil.

[0037] The extracted water, carrying the small bubbles from the ultrasonic generator 51, passes through the second ultrasonic orifice plate generator 52 again. Due to the action of the orifice plate, cavitation occurs, forming a negative pressure zone. At the same time, under the action of ultrasound, the negative pressure zone is strengthened, forming supercavitation, which again generates high pressure, high temperature, and high gradient flow, enhancing the demulsification effect of the emulsified oil.

[0038] The extracted water, carrying the small bubbles from the splitting process, passes through the inlet pipe 25 and then through the first ultrasonic orifice plate generator 11. Due to the action of the orifice plate, cavitation occurs, forming a negative pressure zone. At the same time, under the action of ultrasound, the negative pressure zone is strengthened, forming supercavitation, which again generates high pressure, high temperature, and high gradient flow, enhancing the demulsification effect of the emulsified oil.

[0039] The produced water that has completed the supercavitation reaction enters the hydraulic cavitation dissolved air reactor 4, where the hydraulic cavitation reaction is further completed. This makes it easier for the released microbubbles to combine with the demulsified oil droplets to form an air flotation body, which then enters the primary air flotation chamber 3. The air flotation body floats to the water surface, completing the oil-water separation.

[0040] The produced water that has completed the first-stage air flotation oil-water separation enters the second-stage air flotation chamber 7 through the first water pipe 26, repeating the reaction and separation process in the first-stage air flotation chamber 3. After completing the second-stage air flotation separation, the third-stage air flotation separation is completed in sequence. Finally, the treated water is discharged through the outlet pipe 16 for reuse or further treatment.

[0041] The air flotation body carrying oil droplets rises to the top of each air flotation chamber, forming an oil layer, a foam layer, and a gas phase space. The oil-water interface instrument 8 monitors the liquid level and oil-water interface in the air flotation chamber and controls the opening of the electric oil recovery valve 6 to stabilize the oil-water interface or ensure stable overflow while discharging gas and oil through the oil recovery pipe 13 to the oil recovery chamber 14. The liquid in the oil recovery chamber 14 is discharged to the oil treatment area through the oil discharge port 15.

[0042] Gas in the oil receiving chamber 14 passes through the gas return pipe 17 to the dissolved air device 18, mixes with part of the return water from the water outlet buffer chamber 12, and then enters the dissolved air pump 21. After being stirred and pressurized by the dissolved air pump 21 to 0.5~0.7MPa, dissolved air water is formed. The opening of the flow regulating valve 20 is used to adjust the gas intake of the dissolved air device 18 to ensure that the gas intake keeps the dissolved air water in a supersaturated state. The supersaturated dissolved air water enters the bubble filter 22, and the large bubbles formed by the supersaturation are discharged through the exhaust device. The saturated dissolved air water enters the supercavitation release generator 5 through the pressurized dissolved air water pipe 19.

[0043] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A supercavitating closed-loop air flotation device, characterized in that, The device includes a main body, inside which are arranged sequentially from front to back a dissolving chamber (2), a primary air flotation chamber (3), a secondary air flotation chamber (7), a tertiary air flotation chamber (9), and an outlet buffer chamber (12); an outlet pipe (16) is provided at the bottom of the outlet buffer chamber (12); cavitation components are provided in the primary air flotation chamber (3), the secondary air flotation chamber (7), and the tertiary air flotation chamber (9) for cavitation of the produced water entering the chamber; The cavitation assembly includes a supercavitation release generator (5), a first ultrasonic orifice plate generator (11), and a hydraulic cavitation dissolved air reactor (4). The bottom of the primary air flotation chamber (3) is provided with a water inlet pipe (25), the inlet end of which is connected in sequence to the first ultrasonic orifice plate generator (11) and the hydraulic cavitation dissolved air reactor (4); the supercavitation release generator (5) is coaxially arranged inside the inlet end of the water inlet pipe (25); the supercavitation release generator (5) is provided with an ultrasonic generator (51) and a second ultrasonic orifice plate generator (52) in sequence, and the inside of the supercavitation release generator (5) is coaxial. A cavitation chamber (54) is provided, and a supercavitation orifice plate (53) is provided inside the cavitation chamber (54); the inlet end of the cavitation chamber (54) is connected to a pressurized dissolved air water pipe (19) for injecting dissolved air water; the outlet end of the cavitation chamber (54) is connected to the inlet end of the ultrasonic generator (51); the extracted water in the water inlet pipe (25) enters the supercavitation release generator (5) and mixes with the dissolved air water at the outlet end of the cavitation chamber (54) at the ultrasonic generator (51). The top of the dissolving chamber (2) is provided with a dosing port (1), and the bottom is connected to the water inlet side of the water inlet pipe (25) through a dosing pipe (24); The device body is also provided with an oil collection chamber (14). The oil collection chamber (14) is located behind the water outlet buffer chamber (12). The oil collection chamber (14) is connected to the first-stage air flotation chamber (3), the second-stage air flotation chamber (7) and the third-stage air flotation chamber (9) respectively through the oil collection component. The bottom of the oil collection chamber (14) is provided with an oil discharge port (15). The water inlet pipe (25) is also equipped with a dosing jet reactor (23), which is located on the rear side of the connection between the water inlet pipe (25) and the dosing pipe (24).

2. The supercavitation sealed air flotation device according to claim 1, characterized in that, It also includes a dissolved air device (18), the water inlet of which is connected to the water outlet buffer chamber (12), the air inlet of which is connected to the oil collection chamber (14) through a gas return pipe (17), the output end of which is connected to a bubble filter (22) through a dissolved air pump (21), and the output end of which is connected to three pressurized dissolved air water pipes (19).

3. The supercavitation sealed air flotation device according to claim 2, characterized in that, A flow regulating valve (20) is provided on the pipeline between the dissolved gas pump (21) and the dissolved gas device (18).

4. The supercavitation sealed air flotation device according to claim 1, characterized in that, The oil collection assembly includes an oil collection pipe (13). The top of the primary air flotation chamber (3), the secondary air flotation chamber (7), and the tertiary air flotation chamber (9) are all equipped with an electric oil collection valve (6) and an oil-water interface meter (8). The three electric oil collection valves (6) are all connected to the oil collection chamber (14) through the oil collection pipe (13). The oil-water interface meter (8) is electrically connected to the corresponding electric oil collection valve (6).

5. The supercavitation sealed air flotation device according to claim 1, characterized in that, The dissolving chamber (2), the water outlet buffer chamber (12), and the oil collection chamber (14) are connected by a connecting pipe (10) to balance the pressure inside the chamber.

6. The supercavitation sealed air flotation device according to claim 1, characterized in that, It also includes the first water pipe (26), the second water pipe (27) and the third water pipe (28); The inlet end of the first water pipe (26) is located in the first-stage air flotation chamber (3), and the outlet end extends into the second-stage air flotation chamber (7) and is connected in sequence to the first ultrasonic orifice plate generator (11) and the hydraulic cavitation dissolved air reactor (4). The supercavitation release generator (5) is coaxially arranged inside the inlet end of the first water pipe (26). The inlet end of the second water pipe (27) is located in the secondary air flotation chamber (7), and the outlet end extends into the tertiary air flotation chamber (9) and is connected in sequence to the first ultrasonic orifice plate generator (11) and the hydraulic cavitation dissolved air reactor (4). The ultrasonic cavitation release generator (5) is coaxially arranged inside the inlet end of the second water pipe (27). The inlet end of the third water pipe (28) is located inside the third-stage air flotation chamber (9), and the outlet end extends into the water outlet buffer chamber (12).

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