Composite electric field and catalytic oxidation synergic device

Abstract

The utility model discloses a kind of composite electric field and catalytic oxidation collaborative device, by main body and oil-water separation device constitute. Main body contains primary reaction pool, secondary reaction pool and oil discharge pool, primary reaction pool is equipped with high-frequency pulse demulsification reactor, top has the first oil discharge pipe of intercommunication oil discharge pool;Secondary reaction pool is equipped with electrolytic catalytic oxidation reactor, top has the second oil discharge pipe of intercommunication oil discharge pool, two reaction pools are connected by intermediate pipeline. Oil-water separation device is below oil discharge port in the bottom of oil discharge pool, it includes base, receiving barrel, main and auxiliary pistons, main and auxiliary hydraulic cylinders, receiving barrel bottom has main and auxiliary adjusting cylinder, main and auxiliary pistons are respectively sealedly connected, outer wall is equipped with oil flow passage. The device realizes oil droplet separation in oily sewage, suspended matter removal and anaerobic microorganism killing through high-frequency pulse demulsification, electrocoagulation, electrolytic catalytic oxidation synergistic effect, further separates oil and water by oil-water separation device, achieves the comprehensive effect of purifying sewage, removing oil dirt, eliminating microbial hazards.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology, specifically a composite electric field and catalytic oxidation synergistic device. Background Technology

[0002] High suspended solids and oil content are common characteristics of produced water from oil and gas fields, but shale gas fracturing flowback fluids contain a large number of proppant particles, while heavy oil wastewater contains emulsified oil droplets. Temperature is also a key parameter; geothermal oilfield water temperatures can reach over 80°C. Chemical characteristics are more complex, with total dissolved solids ranging from several thousand to hundreds of thousands of milligrams per liter, and high salinity affecting treatment process selection. Ionic composition varies greatly; for example, changes in chloride, calcium and magnesium ions, and sulfate content directly affect scaling and corrosion tendency. Special components such as hydrogen sulfide, radioactive substances, and residual chemicals must also be considered. Biological characteristics are often overlooked; sulfate-reducing bacteria and iron bacteria can cause severe corrosion, while bacteria in polymer flooding wastewater produce viscous metabolites. Regarding pollutant characteristics, dissolved oil and emulsified oil are treated differently; a high COD / BOD ratio indicates a higher content of recalcitrant organic matter. Water quality varies significantly at different development stages; for example, the viscosity of wastewater increases significantly after polymer flooding. These characteristics pose challenges to the treatment process: high salinity affects biochemical efficiency, oil and suspended solids easily clog membrane systems, and fluctuating water quality requires the process to be highly adaptable.

[0003] Existing technologies mostly employ chemical demulsification, which relies on large amounts of chemicals, such as PAC at dosages of 50-100 mg / L. This can easily cause secondary pollution and has limited effectiveness on highly stable emulsified oils. While ultrasonic or microwave demulsification can reduce the amount of chemicals used, its energy consumption is as high as 0.5-1.2 kWh / m³. 3 Furthermore, gravity separation cannot simultaneously achieve deep removal of suspended solids. In addition, gravity separation has a removal rate of less than 60% for oil droplets with a particle size <50μm, and existing oil-water separation devices, such as inclined plate oil separators, are easily affected by water flow fluctuations, making it difficult to control the oil layer thickness, leading to increased load on subsequent treatment processes. In summary, existing oily wastewater treatment technologies cannot simultaneously achieve efficient oil droplet coalescence and separation, deep sedimentation removal of suspended solids, and effective elimination of anaerobic microorganisms through single or simple combinations of processes. Moreover, the subsequent oil-water separation process cannot achieve further thorough separation of oil and water by precisely controlling the water level rise, making it difficult to achieve the comprehensive effect of purifying wastewater, removing oil, and eliminating microbial hazards. Utility Model Content

[0004] The purpose of this invention is to provide a synergistic device for a composite electric field and catalytic oxidation, in order to solve the following technical problems mentioned in the background art:

[0005] Existing technologies cannot achieve the combined effects of purifying wastewater, removing oil stains, and eliminating microbial hazards.

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

[0007] A composite electric field and catalytic oxidation synergistic device includes a main body and an oil-water separation device. The main body is equipped with a primary reaction tank, a secondary reaction tank, and an oil discharge tank. The primary reaction tank houses a high-frequency pulse demulsification reactor, and the secondary reaction tank houses an electrolytic catalytic oxidation reactor. A first oil discharge pipe is located at the top of the primary reaction tank, and a second oil discharge pipe is located at the top of the secondary reaction tank. Both the first and second oil discharge pipes are connected to the oil discharge tank. The primary and secondary reaction tanks are connected via an intermediate pipe. An oil discharge port is located at the bottom of the oil discharge tank, and the oil-water separation device is located below the oil discharge port. The oil-water separation device includes a base, a receiving tank, a main piston, a secondary piston, a main hydraulic cylinder, and a secondary hydraulic cylinder. The receiving tank is mounted on the base, and several oil flow ports are located on the outer wall of the receiving tank near the top. A main regulating cylinder and several secondary regulating cylinders are located at the bottom of the receiving tank. The main piston is movably and sealed within the main regulating cylinder, and the secondary piston is movably and sealed within the secondary regulating cylinders. Both ends of the main hydraulic cylinder are connected to the main piston and the base, respectively, and both ends of the secondary hydraulic cylinder are connected to the secondary piston and the base, respectively.

[0008] Furthermore, an inlet is provided on the top side of the primary reaction tank, a first row of miscellaneous outlets is provided at the bottom of the primary reaction tank, and a second row of miscellaneous outlets is provided at the bottom of the secondary reaction tank.

[0009] Furthermore, a water pump is installed on the intermediate pipeline.

[0010] Furthermore, the inner walls of both the primary and secondary reaction tanks are equipped with an anti-corrosion layer made of polytetrafluoroethylene (PTFE) with a thickness of 2-5 mm.

[0011] Furthermore, a drain pipe is installed on one side of the receiving tank, and a drain valve is installed on the drain pipe.

[0012] Furthermore, an oil trough is provided on the outside of the receiving tank, and the oil trough is located below the oil flow port.

[0013] Furthermore, a conical oil drain nozzle is provided on one side of the oil tank.

[0014] Furthermore, a stabilizer bar is fixed to the bottom of the main piston, and a stabilizer frame is fixed to the base, with the stabilizer bar and stabilizer frame slidably connected.

[0015] Furthermore, the diameters of the multiple auxiliary regulating cylinders are distributed in an arithmetic sequence.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention effectively achieves the coalescence and separation of oil droplets and the sedimentation and removal of suspended solids in oily wastewater through the synergistic effect of high-frequency pulse demulsification, electrocoagulation, and electrolytic catalytic oxidation, while killing anaerobic microorganisms. The subsequent oil-water separation device further separates oil and water by controlling the rise of the water level, ultimately achieving the comprehensive effect of purifying wastewater, removing oil, and eliminating microbial hazards. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a front view schematic diagram of the overall structure of this utility model;

[0020] Figure 3 This is a top view of the overall structure of this utility model;

[0021] Figure 4 This is one of the overall structural schematic diagrams of the oil-water separation device of this utility model;

[0022] Figure 5 This is a schematic diagram of the internal structure of the oil-water separation device of this utility model;

[0023] Figure 6 This is the second schematic diagram of the overall structure of the oil-water separation device of this utility model.

[0024] The markings in the diagram are: 1-Main body, 2-Water inlet, 3-First oil drain pipe, 4-First stage reaction tank, 5-Oil drain tank, 6-Second stage reaction tank, 7-Second oil drain pipe, 8-Oil-water separator, 9-Intermediate pipe, 10-Second miscellaneous outlet, 11-Oil drain port, 12-First miscellaneous outlet, 13-Water pump, 14-Base, 15-Oil tank, 16-Oil drain nozzle, 17-Oil flow port, 18-Receiving tank, 19-Drain pipe, 20-Drain valve, 21-Secondary hydraulic cylinder, 22-Secondary regulating cylinder, 23-Main regulating cylinder, 24-Main hydraulic cylinder, 25-Main piston, 26-Secondary piston, 27-Stabilizing bar, 28-Stabilizing frame. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example:

[0027] A composite electric field and catalytic oxidation synergistic device, such as Figure 1 As shown, the device includes a main body 1 and an oil-water separation device 8. The main body 1 is equipped with a primary reaction tank 4, a secondary reaction tank 6, and an oil discharge tank 5. The primary reaction tank 4 is used to house a high-frequency pulse demulsification reactor, and the secondary reaction tank 6 is used to house an electrolytic catalytic oxidation reactor. A first oil discharge pipe 3 is installed at the top of the primary reaction tank 4, and a second oil discharge pipe 7 is installed at the top of the secondary reaction tank 6. Both the first oil discharge pipe 3 and the second oil discharge pipe 7 are connected to the oil discharge tank 5. Figure 3 As shown, the primary reaction tank 4 and the secondary reaction tank 6 are connected by an intermediate pipe 9; Figure 2 As shown, an oil drain outlet 11 is provided at the bottom of the oil drain tank 5, and an oil-water separator 8 is located below the oil drain outlet 11; Figure 4 as well as Figure 5 As shown, the oil-water separator 8 includes a base 14, a receiving tank 18, a main piston 25, a secondary piston 26, a main hydraulic cylinder 24, and a secondary hydraulic cylinder 21. The receiving tank 18 is mounted on the base 14, and several oil flow ports 17 are provided on the outer wall of the receiving tank 18 near the top. A main regulating cylinder 23 and several secondary regulating cylinders 22 are provided at the bottom of the receiving tank 18. The main piston 25 is movably and sealed within the main regulating cylinder 23, and the secondary piston 26 is movably and sealed within the secondary regulating cylinders 22. The two ends of the main hydraulic cylinder 24 are connected to the main piston 25 and the base 14, respectively, and the two ends of the secondary hydraulic cylinder 21 are connected to the secondary piston 26 and the base 14, respectively.

[0028] Specifically, the working principle of this composite electric field and catalytic oxidation synergistic device is to purify oily wastewater and solve related problems through multi-stage treatment and synergistic effects. Specifically, the incoming water first enters the primary reaction tank 4, where the high-frequency pulse demulsification reactor performs demulsification under the action of the high-frequency pulse electric field. At the same time, the suspended solids in the water are aggregated into larger flocs by electrocoagulation and gradually settle to the bottom of the equipment. The demulsified oil droplets merge into large oil droplets under the action of dielectric electrophoresis and dipole aggregation, and float to the water surface under the action of micro bubbles generated by electrolysis. Then, water is added to make the water level higher than the first oil discharge pipe 3, allowing the oil droplets on the water surface to mix with the water and enter the oil discharge tank 5. After treatment in the primary reaction tank 4, the water enters the secondary reaction tank 6 through the intermediate pipe 9. The electrolytic catalytic oxidation reactor in the secondary reaction tank 6 promotes the continued growth and sedimentation of flocs in the water, and the oil droplets continue to coalesce. At the same time, they float to the surface under the impetus of hydrogen bubbles generated by cathode electrolysis. In addition, the Cl2 / HClO and hydroxyl radicals generated during the electrolysis process will oxidize and kill anaerobic microorganisms such as SRB, IB, and TGB in the water. Similarly, by adding water to make the water level higher than the second oil discharge pipe 7, the oil droplets on the water surface are mixed with water and enter the oil discharge tank 5. Oil and water in the oil drain 5 enter the receiving tank 18 of the oil-water separator 8 through the oil drain port 11. The initial liquid level is controlled to be lower than the oil flow port 17. Then, the main hydraulic cylinder 24 is started, which drives the main piston 25 to rise slowly, causing the water level in the receiving tank 18 to rise. When the water level reaches the position of the oil flow port 17, the oil floating on the surface flows away from the oil flow port 17. Then, the auxiliary hydraulic cylinder 21 is started, which drives the auxiliary piston 26 to rise. Since the diameter of the auxiliary regulating cylinder 22 is smaller than that of the main regulating cylinder 23, the auxiliary hydraulic cylinder 21 and the auxiliary piston 26 can further make the water level rise slowly, ensuring that the remaining oil droplets on the water surface flow away from the oil flow port 17. Its function is to effectively achieve the coalescence and separation of oil droplets and the sedimentation and removal of suspended solids in oily wastewater through the synergistic effect of multiple actions such as high-frequency pulse demulsification, electrocoagulation, and electrolytic catalytic oxidation, while killing anaerobic microorganisms. The subsequent oil-water separation device 8 further separates oil and water by controlling the rise of the water surface, and finally achieves the comprehensive effect of purifying wastewater, removing oil, and eliminating microbial hazards.

[0029] In a preferred embodiment, such as Figure 1 As shown, an inlet 2 is provided at the top of one side of the primary reaction tank 4, and a first discharge port 12 is provided at the bottom of the primary reaction tank 4. A second discharge port 10 is provided at the bottom of the secondary reaction tank 6. Valves are provided on both the first discharge port 12 and the second discharge port 10. The inlet 2 at the top of the primary reaction tank 4 is used to introduce the water to be treated, and the first discharge port 12 at the bottom and the second discharge port 10 at the bottom of the secondary reaction tank 6 can respectively discharge the flocculated flocs and other impurities that have settled in the two reaction tanks. The valves on them can control the opening and closing of the discharge ports, which facilitates timely cleaning of impurities according to the treatment situation and ensures the continuous and stable operation of the reaction tanks.

[0030] In a preferred embodiment, such as Figure 3 As shown, a water pump 13 is installed on the intermediate pipe 9. The water pump 13 on the intermediate pipe 9 is used to provide power for the water transport from the primary reaction tank 4 to the secondary reaction tank 6, ensuring that the water after primary treatment can smoothly enter the secondary reaction tank 6 for subsequent treatment, and ensuring the continuous operation of the entire treatment process.

[0031] In a preferred embodiment, the inner walls of both the primary reaction tank 4 and the secondary reaction tank 6 are provided with an anti-corrosion layer made of polytetrafluoroethylene (PTFE) with a thickness of 2-5 mm. The PTFE anti-corrosion layer on the inner walls of the primary reaction tank 4 and the secondary reaction tank 6 can resist the erosion of the tank body by corrosive substances that may be generated during the treatment process, protect the tank structure, extend the service life of the equipment, and ensure stable reaction.

[0032] In a preferred embodiment, such as Figure 4 As shown, a drain pipe 19 is provided on one side of the receiving tank 18, and a drain valve 20 is provided on the drain pipe 19. The drain pipe 19 and drain valve 20 on one side of the receiving tank 18 are used to drain the remaining water in the receiving tank 18 after the oil-liquid separation is completed, so as to facilitate subsequent cleaning or reprocessing and ensure the recycling of the oil-water separation device 8.

[0033] In a preferred embodiment, such as Figure 4 As shown, an oil trough 15 is provided on the outer side of the receiving tank 18, and the oil trough 15 is located below the oil flow port 17. The oil trough 15 on the outer side of the receiving tank 18, located below the oil flow port 17, is used to collect the oil flowing out of the oil flow port 17, achieving oil collection and preventing oil from flowing randomly and causing pollution. It also facilitates subsequent centralized processing or recycling of the collected oil. Further optimized, a conical oil drain nozzle 16 is provided on one side of the oil trough 15. The conical oil drain nozzle 16 on one side of the oil trough 15 facilitates the centralized discharge of the oil collected in the oil trough 15. Its conical design reduces oil residue and facilitates subsequent transfer, storage, or reuse of the collected oil, improving the convenience of oil collection and processing.

[0034] In a preferred embodiment, such as Figure 6 As shown, a stabilizing rod 27 is fixedly connected to the bottom of the main piston 25, and a stabilizing frame 28 is fixedly connected to the base 14. The stabilizing rod 27 and the stabilizing frame 28 are slidably connected. The slidable connection between the stabilizing rod 27 at the bottom of the main piston 25 and the stabilizing frame 28 on the base 14 provides guidance and support when the main piston 25 moves with the main hydraulic cylinder 24, preventing the main piston 25 from deviating or shaking, ensuring its stable operation, and thus ensuring the smooth rise and fall of the water level in the receiving tank 18, improving the oil-water separation effect.

[0035] In a preferred embodiment, the diameters of the multiple auxiliary regulating cylinders 22 are distributed in an arithmetic sequence. This arithmetic sequence distribution, combined with the fact that the diameters of the multiple auxiliary regulating cylinders 22 are smaller than those of the main regulating cylinder 23, allows for more precise control of the water level rise rate within the receiving tank 18, enabling different amounts of oil droplets to flow out from the oil flow port 17 in stages and more thoroughly, thus improving the accuracy and efficiency of oil-water separation.

[0036] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite electric field and catalytic oxidation synergistic device, characterized in that: The system includes a main body (1) and an oil-water separation device (8). The main body (1) is equipped with a primary reaction tank (4), a secondary reaction tank (6), and an oil drain tank (5). The primary reaction tank (4) is used to install a high-frequency pulse demulsification reactor, and the secondary reaction tank (6) is used to install an electrolytic catalytic oxidation reactor. The top of the primary reaction tank (4) is equipped with a first oil drain pipe (3), and the top of the secondary reaction tank (6) is equipped with a second oil drain pipe (7). Both the first oil drain pipe (3) and the second oil drain pipe (7) are connected to the oil drain tank (5). The primary reaction tank (4) and the secondary reaction tank (6) are connected through an intermediate pipe (9). The bottom of the oil drain tank (5) is equipped with an oil drain port (11), and the oil-water separation device (8) is located below the oil drain port (11). The oil-water separator (8) includes a base (14), a receiving bucket (18), a main piston (25), a secondary piston (26), a main hydraulic cylinder (24), and a secondary hydraulic cylinder (21). The receiving bucket (18) is set on the base (14), and a number of oil flow ports (17) are provided on the outer wall of the receiving bucket (18) near the top. A main regulating cylinder (23) and a number of secondary regulating cylinders (22) are provided at the bottom of the receiving bucket (18). The main piston (25) is movably and sealed in the main regulating cylinder (23), and the secondary piston (26) is movably and sealed in the secondary regulating cylinder (22). The two ends of the main hydraulic cylinder (24) are connected to the main piston (25) and the base (14) respectively, and the two ends of the secondary hydraulic cylinder (21) are connected to the secondary piston (26) and the base (14) respectively.

2. The composite electric field and catalytic oxidation synergistic device according to claim 1, characterized in that: A water inlet (2) is provided on the top of one side of the primary reaction tank (4), a first row of miscellaneous outlets (12) is provided at the bottom of the primary reaction tank (4), and a second row of miscellaneous outlets (10) is provided at the bottom of the secondary reaction tank (6).

3. The composite electric field and catalytic oxidation synergistic device according to claim 1, characterized in that: A water pump (13) is installed on the intermediate pipe (9).

4. The composite electric field and catalytic oxidation synergistic device according to claim 1, characterized in that: The inner walls of both the primary reaction tank (4) and the secondary reaction tank (6) are provided with anti-corrosion layers. The anti-corrosion layers are made of polytetrafluoroethylene material with a thickness of 2-5 mm.

5. The composite electric field and catalytic oxidation synergistic device according to claim 1, characterized in that: A drain pipe (19) is provided on one side of the receiving bucket (18), and a drain valve (20) is provided on the drain pipe (19).

6. The composite electric field and catalytic oxidation synergistic device according to claim 1, characterized in that: An oil trough (15) is provided on the outside of the receiving tank (18), and the oil trough (15) is located below the oil flow port (17).

7. The composite electric field and catalytic oxidation synergistic device according to claim 6, characterized in that: A conical oil drain nozzle (16) is provided on one side of the oil tank (15).

8. The composite electric field and catalytic oxidation synergistic device according to claim 1, characterized in that: A stabilizer bar (27) is fixed to the bottom of the main piston (25), and a stabilizer frame (28) is fixed to the base (14). The stabilizer bar (27) and the stabilizer frame (28) are slidably connected.

9. The composite electric field and catalytic oxidation synergistic device according to claim 1, characterized in that: The diameters of the multiple auxiliary regulating cylinders (22) are distributed in an arithmetic sequence.

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