Electromagnetic-acoustic integrated coupling heavy oil sewage treatment device

Abstract

The invention relates to an electromagnetic-acoustic integrated coupling heavy oil sewage treatment device, and belongs to the technical field of water purification equipment. The raw material tank is provided with a feeding hole and a stirrer, and a water pump pumps water in the raw material tank into a water purification tank through a pipeline; a water outlet is formed in the top of the water purification tank, a sludge outlet is formed in the bottom of the water purification tank, and an ultrasonic generating device, an ultrasonic receiving device, a magnetic field device and an electric field generating device are arranged in the water purification tank; the ultrasonic generating device is used for generating an ultrasonic field to destroy the thickness of the oil-water interfacial film; the ultrasonic receiving device is used for eliminating reflection and refraction of ultrasonic waves in the tank body; the electric field generating device is used for generating an electric field to accelerate magnetic particle sedimentation; the magnetic field device is used for generating a magnetic field to trap magnetic flocs formed by combining the oil drops with the magnetic particles and the flocculating agent; the electric field generating device is electrically connected with the transformer and the high-frequency high-voltage pulse power supply. Under the joint coupling action of electric field force, ultrasonic field and magnetic field, the problem of high difficulty in heavy oil sewage treatment is effectively solved.

Description

Technical Field

[0001] The invention relates to an electromagnetic-acoustic integrated coupling thick oil sewage treatment device, belonging to the technical field of water purification equipment. Background Art

[0002] As the oil field gradually enters the middle and late stages of development, the water content in the produced fluid increases sharply, and the water treatment pressure continues to increase. At the same time, the proportion of heavy oil development is gradually increasing, and the proportion of tertiary oil recovery technologies such as chemical drive is also increasing. As a result, the degree of oil-water emulsification in oil field produced fluid wastewater has become more serious, the difficulty of oil-water separation has increased, and the content of suspended matter and heavy metal ions is high, with a variety of complex and harmful components, which brings great challenges to traditional physical and chemical methods of wastewater treatment.

[0003] Coagulation and flocculation can effectively remove suspended solids and metal ions and are one of the most effective methods for treating sewage. Magnetic flocculation is to add magnetic particles and flocculants to form magnetic flocs in the presence of coagulants, and then the magnetic flocs can be quickly settled by applying an external magnetic field. Studies have found that adding magnetic particles—Fe 3 O 4 The flocculation reaction with polyaluminium chloride has good treatment efficiency, which is not only reflected in the high removal rate of oil pollution, but also in the rapid sedimentation of flocculants, which shortens the reaction time. At the same time, the recovery rate is high and it can be reused after simple treatment, which improves the effect and reduces the cost.

[0004] However, due to the high degree of emulsification of the oil component in the oilfield produced liquid viscous oil wastewater, it is difficult to directly treat it by magnetic flocculation. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, which applies a high-frequency pulse electric field and an ultrasonic field to the oily wastewater for demulsification while performing magnetic flocculation. Under the joint action of the electric field force and the ultrasonic wave, the oil-water interfacial tension is reduced, the oil component is separated from the water component, and the water droplets are continuously gathered and transformed into clean components under the action of the electric field force. Due to the high water content, a high-frequency and high-voltage pulse electric field is used to avoid short circuit; at the same time, a series of ultrasonic effects generated by the ultrasonic wave, such as stirring, collision, aggregation, cavitation, negative pressure, etc., are conducive to the combination of oil droplets with magnetic particles and flocculants. After the oil droplets are combined with them to form magnetic flocs, they are quickly settled and captured under the action of the magnetic field. At the same time, in order to prevent some flocs from escaping, a subsequent inclined plate sedimentation device and a secondary magnetic field are provided to capture the flocs for a second time, thereby ensuring the cleanliness of the effluent from the device, realizing efficient pretreatment of heavy oil wastewater, effectively solving the problem of difficulty in treating heavy oil wastewater, and ensuring production operation.

[0006] To achieve the above-mentioned purpose, the technical solution of the present application is an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, comprising a raw material tank, a clean water tank and a water pump; the raw material tank is provided with a feed inlet and an agitator, and the water pump pumps the wastewater, magnetic particles and flocculant stirred by the agitator in the raw material tank into the clean water tank through a pipeline; the top of the clean water tank is provided with an exhaust port and a water outlet, the bottom of the tank is provided with a mud discharge port, and the clean water tank is provided with an ultrasonic generating device, an ultrasonic receiving device, a magnetic field device and an electric field generating device;

[0007] An ultrasonic generator, used to generate an ultrasonic field to change the thickness of the oil-water interface film;

[0008] Ultrasonic receiving device, used to eliminate the reflection and refraction of ultrasonic waves in the tank;

[0009] An electric field generating device, used to generate an electric field to accelerate the sedimentation of magnetic particles;

[0010] The magnetic field device is used to generate a magnetic field to capture the magnetic flocs formed by the combination of oil droplets, magnetic particles and flocculants; the electric field generating device is electrically connected to the transformer and the high-frequency and high-voltage pulse power supply.

[0011] Furthermore, an inclined plate sedimentation device is also provided in the water purification tank body, and the inclined plate sedimentation device is used to increase the sedimentation area of ​​the magnetic flocs.

[0012] Furthermore, the water purification tank is also provided with a first weir plate and a second weir plate, the first weir plate and the second weir plate are arranged at intervals, there is a certain gap between one end of the first weir plate and the tank top, and there is a certain gap between one end of the second weir plate and the tank bottom, the first weir plate and the second weir plate divide the water purification tank into a coupling action area and a sedimentation area; the ultrasonic generating device is installed on the side wall of the tank body in the coupling action area, and the ultrasonic receiving device is installed on the first weir plate; the magnetic field device is a magnet, including magnet A and magnet B, magnet A is relatively fixed on the tank top and tank bottom of the coupling action area, respectively, and magnet B is relatively fixed on the tank top and tank bottom of the sedimentation area, respectively; the electric field generating device is a plurality of electrode plates, a suspension frame is installed on the inner wall of the tank top in the coupling action area, and the electrode plates are arranged on the suspension frame at intervals; the inclined plate sedimentation device is a plurality of V-shaped folded plates arranged at intervals, and the V-shaped folded plates are arranged in the tank body of the sedimentation area with an opening facing the tank bottom.

[0013] Furthermore, the electrode plate is a wire mesh electrode composed of smooth metal wires, which is arranged perpendicular to the horizontal axis of the tank body. The direction of the electric field generated by the electrode plate is parallel to the horizontal axis, and a dense insulating layer is coated on the surface of the electrode plate.

[0014] Furthermore, mud flushing pipes are provided above the magnets A and B at the bottom of the water purification tank, respectively. A plurality of nozzles are arranged on the mud flushing pipes, and water is sprayed through the nozzles to discharge the magnetic flocs from the mud discharge port.

[0015] Furthermore, the magnetic particles are Fe3 O 4 The flocculant is polyaluminium chloride, and the mass concentration of the flocculant in the raw material tank is 0.1-0.2%.

[0016] Furthermore, a gradually expanding pipe and a curved pipe are connected between the water pump and the water purification tank. The gradually expanding pipe is connected to the curved pipe, and one end of the curved pipe extends into the water purification tank.

[0017] Furthermore, a baffle is provided directly below the curved pipe in the water purification tank to further increase the turbulence of the liquid and prevent the magnetic particles from settling.

[0018] Furthermore, the water outlet is connected to a water collecting pipe, which is located between the V-shaped folded plate and the magnet B on the top of the tank. The water collecting pipe is parallel to the horizontal axis of the tank body, and has a downward-inclined water collecting hole to facilitate the entry of purified water and discharge from the water outlet through the water collecting pipe.

[0019] Furthermore, the bottom of the tank in the coupling action area is also provided with an emptying port, and when the water in the tank needs to be completely discharged, the water flows out from the emptying port.

[0020] The present invention adopts the above technical solution to achieve the following technical effects:

[0021] (1) The sewage, magnetic particles and flocculants in the raw material tank are fully stirred by the agitator and then enter the water purification tank through the expansion pipe and the elbow to ensure that the raw material liquid is in a turbulent state. A baffle is set under the elbow to further increase the turbulence of the liquid, avoid the sedimentation of the magnetic particles, and effectively improve the water treatment efficiency.

[0022] (2) The electric field effect is generated by a high-frequency high-voltage pulse power supply. The electric field parameters including voltage amplitude, electric field frequency and pulse width ratio are easy to adjust. Compared with traditional DC and AC power supplies, the risk of "electric field collapse" and short circuit due to excessive water content is greatly reduced. At the same time, a wire mesh electrode plate composed of smooth metal wires is used to ensure the electric field strength while being placed perpendicular to the horizontal axis to avoid short circuit caused by accumulation and adhesion of water droplets. In the electric field, the aggregation rate of water droplets is increased under the action of dipole force, making it easier for oil droplets to combine with magnetic particles and flocculants.

[0023] (3) The ultrasonic generator generates a series of ultrasonic effects such as stirring, collision, aggregation, cavitation, negative pressure, etc., which greatly reduce the thickness of the oil-water interface film, increase the rate of water droplet aggregation, and facilitate the combination of oil droplets with magnetic particles and flocculants. Under the coupling of electric field force and ultrasonic wave, oil droplets combine with magnetic particles and flocculants to form magnetic flocs, which move downward rapidly under the action of magnetic field and are captured by magnets, greatly increasing the processing capacity.

[0024] (4) The first weir plate and the second weir plate divide the clean water tank into two parts. The upper part of the coupling zone is clean water, which flows between the first weir plate and the second weir plate to the sedimentation zone for further sedimentation, and then flows out through the upper water collecting pipe again. The treatment efficiency is improved by changing the flow channel. The overall treatment is a dynamic process. The equipment occupies a small area and has a large treatment capacity. The magnetic particles and flocculants are metal compounds and can be recycled to reduce costs.

[0025] (5) By setting up mud flushing pipes and mud discharge ports, the settled magnetic flocs are regularly flushed to avoid accumulation that weakens the magnetic field effect.

[0026] (6) By setting up an inclined plate sedimentation device, the sedimentation area of ​​the magnetic flocs is increased when the sewage comes into contact with it, further improving the water treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0028] Figure 2 Schematic diagram of the electrode plate in Example 1 of the present invention.

[0029] Explanation of the serial numbers in the figure: 1. Raw material tank; 2. Feed inlet; 3. Water pump; 4. Gradually expanding pipe; 5. Bend pipe; 6. Baffle; 7. Ultrasonic generator; 8. Water purification tank; 9. Agitator; 10. Magnet A; 11. Mud discharge port; 12. Magnet B; 14. Mud flushing pipe; 15. V-shaped folded plate; 16. Water collecting pipe; 17. Water outlet; 18. First weir plate; 19. Hanging bracket; 20. Exhaust port; 21. Electrode plate; 22. Transformer; 23. High-frequency and high-voltage pulse power supply; 24. Ultrasonic receiving device; 25. Second weir plate; 26. Coupling action area; 27. Sedimentation area; 28. Nozzle; 29. ​​Water collecting hole; 30. Drainage port. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: this example is used to further describe the present application.

[0031] Embodiment 1:

[0032] like Figures 1-2As shown, this embodiment provides an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, including a raw material tank 1, a clean water tank 8 and a water pump 3; the raw material tank 1 is provided with a feed port 2 and an agitator 9, and a gradually expanding pipe 4 and a curved pipe 5 are also connected between the water pump 3 and the clean water tank 8, the gradually expanding pipe 4 is connected to the curved pipe 5, one end of the curved pipe 5 extends into the clean water tank 8, a baffle 6 is arranged directly below the curved pipe 5, and the baffle 6 is horizontally arranged on the inner wall of the tank body, the gradually expanding pipe 4 has an expansion angle between 10° and 20°, the downward angle of the curved pipe 5 is between 25° and 30°, and an exhaust port 20 is arranged above the curved pipe 5 to adjust the pressure in the tank body, and the water pump 3 pumps the sewage, magnetic particles and flocculant stirred by the agitator 9 in the raw material tank 1 into the clean water tank 8 through a pipeline;

[0033] The water purification tank 8 is provided with an ultrasonic generator 7, an ultrasonic receiver 24, a magnetic field device, an electric field generator and an inclined plate sedimentation device; the ultrasonic generator 7 is used to generate an ultrasonic field to reduce the thickness of the oil-water interface film; the ultrasonic receiver 24 is used to eliminate the reflection and refraction of the ultrasonic wave in the tank body; the electric field generator is used to generate an electric field to accelerate the sedimentation of magnetic particles; the magnetic field device is used to generate a magnetic field to capture the magnetic flocs formed by the combination of oil droplets, magnetic particles and flocculants; the electric field generator is electrically connected to the transformer 22 and the high-frequency high-voltage pulse power supply 23. The inclined plate sedimentation device is used to increase the sedimentation area of ​​the magnetic flocs.

[0034] The water purification tank 8 is further provided with a first weir plate 18 and a second weir plate 25, which are arranged at intervals and perpendicular to the horizontal axis of the tank body. There is a certain gap between one end of the first weir plate 18 and the tank top, and there is a certain gap between one end of the second weir plate 25 and the tank bottom. The first weir plate 18 and the second weir plate 25 divide the water purification tank 8 into a coupling action area 26 and a sedimentation area 27; the ultrasonic generating device 7 is installed on the side wall of the tank body in the coupling action area 26, and the ultrasonic receiving device 24 is installed on the first weir plate 18 The magnetic field device is a magnet, including a magnet A10 and a magnet B12. The magnet A10 is relatively fixed to the tank top and tank bottom of the coupling action zone 26, and the magnet B12 is relatively fixed to the tank top and tank bottom of the sedimentation zone 27. The electric field generating device is a plurality of electrode plates 21. A suspension frame 19 is installed on the inner wall of the tank top of the coupling action zone 26, and the electrode plates 21 are arranged on the suspension frame 19 at intervals. The inclined plate sedimentation device is a plurality of V-shaped folded plates 15 arranged at intervals. The V-shaped folded plates 15 are arranged in the tank body of the sedimentation zone 27 with the opening facing the tank bottom. The tank bottoms of the coupling action zone 26 and the sedimentation zone 27 are both provided with mud discharge ports 11, and the tank bottom of the coupling action zone is also provided with an emptying port 30.

[0035] A mud flushing pipe 14 is provided above the magnet A10 and the magnet B12 at the bottom of the clean water tank 8, and a plurality of nozzles 28 are arranged on the mud flushing pipe 14. Water is sprayed through the nozzles 28 to discharge the magnetic flocs from the mud discharge port 11. A water outlet 17 is provided on the top of the clean water tank 8. The water outlet 17 is connected to the water collecting pipe 16. The water collecting pipe 16 is located between the V-shaped folded plate 15 and the magnet B12. The water collecting pipe 16 is parallel to the horizontal axis of the tank body, and the water collecting pipe 16 is provided with a downwardly inclined water collecting hole 29, which is convenient for the purified water to enter and be discharged from the water outlet 17 through the water collecting pipe 16.

[0036] The magnetic particles are Fe 3 O 4 The flocculant is polyaluminium chloride, and the mass concentration of the flocculant in the raw material tank 1 is 0.1-0.2%.

[0037] The transformer 22 is a 100:1 step-up transformer, which is connected to the suspension frame 19 and the electrode plate 21 via cables.

[0038] A high-power agitator 9 is arranged in the raw material tank 1, and magnetic particles and flocculants are added into the raw material tank 1 from the feed port 2. The sewage, magnetic particles and flocculants in the raw material tank 1 are fully stirred by the agitator 9 and then enter the coupling action area 26 of the clean water tank 8 through the expansion pipe and the elbow 5 with power provided by the water pump 3 to ensure that the raw material liquid is in a turbulent state. A baffle 6 is arranged under the elbow 5. The sewage collides with the baffle 6 to change its flow direction, further increasing the turbulence of the liquid, thereby preventing the magnetic particles from settling prematurely and insufficiently contacting with the sewage, thereby effectively improving the water treatment efficiency.

[0039] The electrode plate 21 covers the coupling action area 26 of the tank body, and the ultrasonic generator 7 and the ultrasonic receiver 24 in this area are used to form a coupling action with the electric field, and the two magnets A are used to form a magnetic field to accelerate the sedimentation of magnetic particles. That is to say, the coupling action area 26 includes three fields: electric, magnetic, and acoustic. The electric field part is formed by the electrode plate 21. Several electrode plates 21 are placed perpendicular to the horizontal axis of the tank body. The electrode plate 21 is a wire mesh electrode composed of smooth metal wires. The direction of the electric field is parallel to the horizontal axis direction. At the same time, multiple electrode plates 21 are set to form a strong electric field area. The surface of the electrode plate 21 is coated with a dense insulating layer. The wire mesh electrode composed of smooth metal wires can prevent water droplets from gathering on the surface of the plate and causing a short circuit. In order to avoid the collapse of the electric field and reduce the risk of short circuit, the electric field power supply adopts a high-frequency high-voltage pulse power supply 23. Compared with traditional DC and AC power supplies, the high-frequency high-voltage pulse power supply 23 is more suitable for liquids with high water content. By adjusting the electric field parameters, including voltage amplitude, electric field frequency, pulse width ratio, etc., it can effectively prevent "collapse of the electric field". At the same time, the intermittent discharge of the pulse electric field is conducive to increasing the vibration effect and facilitating the aggregation of water droplets. The electrode plate 21 is connected to the power supply system through the suspension bracket 19, and the power supply system includes a transformer 22 and a high-frequency high-voltage pulse power supply 23. The connection between the suspension bracket 19 and the tank body is coated with insulating paint, and the suspension bracket 19 is insulated from the tank body. The magnetic field is generated by two magnets A10, and the magnet A10 is close to the inner wall of the tank body. The direction of the generated magnetic field is perpendicular to the horizontal axis, and the magnet A10 located at the top of the tank points to the magnet A10 located at the bottom of the tank, so that the magnetic particles move from top to bottom, and the magnetic flocs are captured by the magnet A10 located at the bottom of the tank; the mud flushing pipe 14 is horizontally arranged between the electrode plate 21 and the magnet A10 located at the bottom of the tank, and a plurality of nozzles 28 are arranged on the mud flushing pipe 14, which can accelerate the water flow and impact the magnetic flocs captured on the magnet A10, so as to clean the magnet A10 and avoid accumulation and weakening of the magnetic field; the magnetic flocs are quickly discharged from the mud discharge port 11, which is convenient for recycling and subsequent utilization. The ultrasonic field is composed of an ultrasonic generator 7 and an ultrasonic receiver 24. The ultrasonic effect generated by the ultrasonic generator 7 fills the coupling action area 26. A series of ultrasonic effects such as stirring, collision, aggregation, cavitation, negative pressure, etc. are used to reduce the thickness of the interface film, reduce the oil-water interfacial tension, and make the oil droplets easier to separate. At the same time, the ultrasonic effect is also helpful for the turbulence of the sewage. In order to avoid secondary emulsification, an ultrasonic receiver 24 is set to absorb part of the ultrasonic energy and avoid a large amount of ultrasonic reflection inside the tank. That is, when the sewage generates an ultrasonic effect in the coupling action area 26, the ultrasonic receiver 24 controls the range of ultrasonic emission in the coupling action area 26, and at the same time avoids the reflection and refraction of ultrasonic waves in the coupling action area 26, thereby reducing secondary emulsification.

[0040] The water treated by the coupling action zone 26 may contain uncaptured magnetic flocs. To prevent some tiny flocs from escaping, the water flows into the sedimentation zone 27 from between the first weir plate 18 and the second weir plate 25, and the uncaptured magnetic flocs are captured again by the inclined plate sedimentation device and the magnetic field. That is, when the sewage contacts the V-shaped folded plate 15, the sedimentation area is increased. Under the action of the magnetic field, the magnetic flocs quickly settle to the bottom of the tank and are captured by the magnet B12. The nozzle 28 above the magnet B sprays water to impact the magnetic flocs, so that they are discharged from the mud discharge port 11, ensuring that the water meets the discharge standard, and the clean water treated by the sedimentation zone 27 is discharged from the water outlet 17 through the water collecting pipe 16.

[0041] In actual application, the sewage inlet treatment capacity is 1000m 3 / d, treatment temperature is 60℃, oil concentration is 5000mg / L, suspended solids content is 5000mg / L; put magnetic particles in the raw material tank 1 at a concentration of 15g / L, the mass concentration of flocculant in the raw material tank 1 is 0.15%, adjust the electric field parameters to 5kV voltage, 0.5 pulse width ratio, 5kHz frequency; magnetic field intensity is 150mT; ultrasonic generator 7 frequency is 20kHz, oscillator amplitude is 10-80μm. The oil concentration and suspended solids concentration of the treated sewage are reduced to less than 1000m / L, meeting the discharge standard.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, It is characterized in that The invention comprises a raw material tank (1), a clean water tank (8) and a water pump (3); the raw material tank (1) is provided with a feed port (2) and a stirrer (9); the water pump (3) pumps the sewage, magnetic particles and flocculant stirred by the stirrer (9) in the raw material tank (1) into the clean water tank (8) through a pipeline; the top of the clean water tank (8) is provided with an exhaust port (20) and a water outlet (17), the bottom of the tank is provided with a mud discharge port (11), and the clean water tank (8) is provided with an ultrasonic generating device (7), an ultrasonic receiving device (24), a magnetic field device and an electric field generating device; An ultrasonic generating device (7) for generating an ultrasonic field to change the thickness of the oil-water interface film; An ultrasonic receiving device (24) for eliminating reflection and refraction of ultrasonic waves in the tank; An electric field generating device, used to generate an electric field to accelerate the sedimentation of magnetic particles; The magnetic field device is used to generate a magnetic field to capture magnetic flocs formed by the combination of oil droplets, magnetic particles and flocculants; the electric field generating device is electrically connected to the transformer (22) and the high-frequency high-voltage pulse power supply (23).

2. According to claim 1, an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, It is characterized in that The water purification tank (8) is also provided with an inclined plate sedimentation device in the tank body, and the inclined plate sedimentation device is used to increase the sedimentation area of ​​the magnetic flocs.

3. According to claim 2, an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, It is characterized in that A first weir plate (18) and a second weir plate (25) are also provided in the water purification tank (8). The first weir plate (18) and the second weir plate (25) are arranged at intervals. There is a gap between one end of the first weir plate (18) and the tank top, and there is a gap between one end of the second weir plate (25) and the tank bottom. The first weir plate (18) and the second weir plate (25) divide the water purification tank (8) into a coupling action area (26) and a sedimentation area (27). The ultrasonic generating device (7) is installed on the side wall of the tank body in the coupling action area (26), and the ultrasonic receiving device (24) is installed on the first weir plate (18). The magnetic field device is a magnet. The invention comprises a magnet A (10) and a magnet B (12), wherein the magnet A (10) is fixed relatively to the tank top and the tank bottom of the coupling action zone (26), respectively, and the magnet B (12) is fixed relatively to the tank top and the tank bottom of the precipitation zone (27), respectively; the electric field generating device is a plurality of electrode plates (21), a suspension frame (19) is installed on the inner wall of the tank top of the coupling action zone (26), and the electrode plates (21) are arranged on the suspension frame (19) at intervals; and the inclined plate precipitation device is a plurality of V-shaped folded plates (15) arranged at intervals, and the V-shaped folded plates (15) are arranged in the tank body of the precipitation zone (27) with the opening facing the tank bottom.

4. According to claim 3, an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, It is characterized in that The electrode plate (21) is a wire mesh electrode composed of smooth metal wires and is arranged perpendicular to the horizontal axis direction of the tank body. The direction of the electric field generated by the electrode plate (21) is parallel to the horizontal axis direction. The surface of the electrode plate (21) is coated with a dense insulating layer.

5. According to claim 3, an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, It is characterized in that Mud flushing pipes (14) are respectively provided above the magnets A (10) and B (12) located at the bottom of the water purification tank (8). A plurality of nozzles (28) are arranged on the mud flushing pipes (14). Water is sprayed through the nozzles (28) to discharge the magnetic flocs from the mud discharge port (11).

6. An electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to any one of claims 1 or 3, It is characterized in that A gradually expanding pipe (4) and a curved pipe (5) are also connected between the water pump (3) and the clean water tank (8); the gradually expanding pipe (4) is connected to the curved pipe (5), and one end of the curved pipe (5) extends into the clean water tank (8).

7. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 1, It is characterized in that The magnetic particles are Fe 3 O 4 The flocculant is polyaluminium chloride, and the mass concentration of the flocculant in the raw material tank (1) is maintained at 0.1-0.2%.

8. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 6, It is characterized in that A baffle (6) is arranged just below the inner curved pipe (5) of the clean water tank (8).

9. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 5, It is characterized in that The water outlet (17) is connected to the water collecting pipe (16), the water collecting pipe (16) is located between the V-shaped folded plate (15) and the magnet B (12) on the top of the tank, the water collecting pipe (16) is parallel to the horizontal axis of the tank body, and the water collecting pipe (16) is provided with a downwardly inclined water collecting hole (29) to facilitate the purified water to enter and be discharged from the water outlet (17) through the water collecting pipe (16).

10. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 3, It is characterized in that The bottom of the tank in the coupling action area (26) is also provided with an emptying port (30). When the water in the tank needs to be completely discharged, the water flows out from the emptying port (30).

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