Double-super-cyclone air flotation coalescence system

Abstract

The invention relates to the technical field of water-oil separation, in particular to a double-super-cyclone air flotation coalescence system which comprises a primary coalescence filtering device and a precise coalescence filtering device which are communicated with each other, the primary coalescence filtering device comprises a first tank body and a first filter element, the outer surface of the first filter element is coated with a functional coating, a liquid inlet pipe is arranged on the outer wall of the first tank body in a penetrating manner, and the upper end of the first filter element is connected with a transfer pipe; the precise coalescence filtering device comprises a second tank body and a second filter element, the surface of the second filter element is coated with a functional coating, the transfer pipe penetrates through the first tank body and enters the second tank body, the second filter element is connected with a refined filtration liquid outlet pipe, and the refined filtration liquid outlet pipe is connected with a second tank body. One end, far away from the end connected with the second filter element, of the fine filtration liquid outlet pipe penetrates through the second tank body and is used for outputting fine filtration liquid. The oil-water separation device has the advantages that the problem of low oil-water separation efficiency is solved, and oil-water separation is more thorough.

Description

Technical Field

[0001] This application relates to the technical field of water-oil separation, and particularly to a double-super swirl air flotation coalescence system. Background Art

[0002] During the exploitation process of oil fields, water will inevitably be generated. In order to prevent the water from affecting the quality of crude oil, it is necessary to remove the water in a timely manner.

[0003] In related technologies, usually, water is directly pumped out of the oil field and discharged after filtration.

[0004] In view of the above-mentioned related technologies, the conventional water-oil separation efficiency is low and the separation is not thorough enough. Therefore, some crude oil will still remain in the discharged water, resulting in an impact on the environment. Summary of the Invention

[0005] In order to improve the problem of low water-oil separation efficiency and make the water-oil separation more thorough, this application provides a double-super swirl air flotation coalescence system.

[0006] The double-super swirl air flotation coalescence system provided by this application adopts the following technical solutions: A double-super swirl air flotation coalescence system includes a preliminary coalescence and filtration device and a precision coalescence and filtration device which are connected in communication with each other; The preliminary coalescence and filtration device includes a first tank body and a first filter element arranged in the first tank body. A functional coating is coated on the outer surface of the first filter element. A liquid inlet pipe for inputting the original liquid to be filtered is provided on the outer wall of the first tank body, and the liquid inlet pipe is arranged along the tangential direction of the first tank body. The upper end of the first filter element is connected with a transfer pipe; The precision coalescence and filtration device includes a second tank body and a second filter element arranged in the second tank body. The filtration accuracy of the second filter element is greater than that of the first filter element. A functional coating is coated on the surface of the second filter element. One end of the transfer pipe far from the connection with the first filter element passes through the first tank body and enters the second tank body, and the end of the transfer pipe far from the first tank body is arranged along the tangential direction of the second tank body. The second filter element is connected with a fine filtration outlet pipe, and the end of the fine filtration outlet pipe far from the connection with the second filter element passes through the second tank body for outputting the precision filtrate; One-way valve bodies are provided on the liquid inlet pipe, the transfer pipe and the fine filtration outlet pipe.

[0007] By adopting the above technical solutions, the undiluted solution to be filtered enters the first tank through the liquid inlet pipe and is roughly filtered through the osmosis of the first filter element. The filtrate after rough filtration enters the second tank through the transfer pipe and is finely filtered through the osmosis of the second filter element. The filtrate after fine filtration can be output from the filtration system through the fine filtration outlet pipe. The interconnected preliminary coalescence filtration device and precision coalescence filtration device achieve two-stage filtration of crude oil and water. The first filter element and the second filter element have different filtration precisions and are combined with the functional coatings (hydrophilic oleophobic coatings or oleophilic hydrophobic coatings can be selected) coated on their respective surfaces, which helps to completely separate crude oil from water. The two-stage filtration mechanism can improve the separation efficiency more than a single filtration step. The liquid inlet pipe and the transfer pipe are both arranged along the tangential direction of the tank body. Utilizing the swirling effect of the liquid, a vortex is formed in the tank body, enhancing the mixing and separation effects of the liquid, not only improving the filtration efficiency but also helping to carry away the droplets coalesced on the surface of the filter element, reducing the problems of blockage and deposition. One-way valve bodies are arranged on the liquid inlet pipe, the transfer pipe, and the fine filtration outlet pipe to ensure that the liquid can only flow in a predetermined direction, avoiding the problems of backflow and cross-contamination, and improving the reliability and safety of the system.

[0008] Further, a rough filtration outlet pipe is connected to the transfer pipe located in the first tank. The end of the rough filtration outlet pipe far from the connection with the transfer pipe passes through the first tank for outputting the preliminary filtrate, and a one-way valve body is provided on the rough filtration outlet pipe.

[0009] By adopting the above technical solutions, when the oil content in the undiluted solution to be filtered is low, the water-oil separation effect can be achieved after preliminary filtration, and it can be directly output without further fine filtration. The setting of the rough filtration outlet pipe enables the preliminary filtrate obtained by rough filtration to be directly output from the system, improving the filtration effect.

[0010] Further, a first oil discharge pipe is provided at the central position above the first tank, a first drain pipe is provided on the side wall of the first tank, a second oil discharge pipe is provided at the central position above the second tank, a second drain pipe is provided on the side wall of the second tank. A discharge main pipe for connecting the first oil discharge pipe, the first drain pipe, the second oil discharge pipe, and the second drain pipe is provided on one side of the first tank and the second tank. One-way valve bodies are provided on the first oil discharge pipe, the first drain pipe, the second oil discharge pipe, and the second drain pipe.

[0011] By adopting the above technical solutions, drain pipes are respectively arranged at the central positions above the first tank body and the second tank body. Under the condition of liquid swirling in the tank body, the oil layer accumulated at the upper part of the tank body can be effectively collected, thereby improving the purity of the oil. Similarly, the drain pipe arranged on the side wall of the tank body helps to discharge the accumulated water at the lower part of the tank body, reducing the pollution of water to the oil. The separate arrangement of the drain pipe and the drain pipe enables the oil and water to be separately collected and treated, which helps to avoid the mixing of oil and water, thereby improving the separation efficiency. The arrangement of the discharge main pipe can provide a centralized fluid outlet, facilitating the unified management and discharge of the separated oil and water. One-way valve bodies are arranged on each pipeline to ensure the one-way flow of the fluid in the pipeline, prevent backflow and possible pollution, and also prevent equipment damage or safety accidents caused by the backflow of the fluid, improving the reliability and stability of the system.

[0012] Further, the first filter element includes an upper connecting part, a main body framework and a lower connecting part which are coaxially arranged. The upper connecting part and the lower connecting part are respectively fixedly connected to the upper and lower ends of the main body framework. A plurality of filter membranes arranged in parallel are circumferentially arranged along the length direction of the outer wall of the main body framework, and the functional coating is coated on the outside of each filter membrane; The upper connecting part is used to connect the transfer pipe and the roughly filtered liquid pipe, and the lower connecting part is fixedly connected to the inner wall of the lower side of the first tank body.

[0013] By adopting the above technical solutions, the upper connecting part and the lower connecting part are respectively fixedly connected to the upper and lower ends of the main body framework, enhancing the overall structural stability of the filter element and ensuring the reliable connection between the filter element and components such as the first tank body and the transfer pipe. The upper connecting part is used to connect the transfer pipe and the roughly filtered liquid pipe, making it convenient for the filter element to be integrated with other parts of the filtration system and ensuring the smooth flow of the fluid. A plurality of filter membranes arranged in parallel are circumferentially arranged along the length direction of the outer wall of the main body framework. By arranging them in parallel, the surface area of the filter membrane is increased, thereby increasing the contact probability between the filtrate and the filter membrane and improving the filtration effect.

[0014] Further, the number of the first filter elements is multiple, and a first adapter pipe is arranged in the first tank body for connecting the transfer pipe and the roughly filtered liquid pipe to each upper connecting part; The first adapter pipe includes a first adapter main pipe for connecting with the transfer pipe and the roughly filtered liquid pipe and a plurality of first adapter branch pipes for corresponding connection with each upper connecting part one by one. The ends of each first adapter branch pipe far from each upper connecting part are all connected to the first adapter main pipe, and the transfer pipe and the roughly filtered liquid pipe are both connected to the first adapter main pipe.

[0015] By adopting the above technical solution, the simultaneous use of multiple first filter elements can significantly increase the filtration area, thereby improving the water treatment capacity per unit time. The parallel operation of multiple filter elements also helps to disperse the filtration load and extend the service life of a single filter element. Through the integrated design of the first adapter pipe, the transfer pipe and the rough filtrate pipe are connected to multiple filter elements, simplifying the overall structure of the system.

[0016] Further, the second filter element includes a filter cartridge and an upper connector fixedly connected to the upper end of the filter cartridge. The functional coating is coated on the outside of the filter cartridge, and a fixed connection is provided between the fine filtrate pipe and the upper connector.

[0017] By adopting the above technical solution, the filter cartridge, as the main part of the second filter element, combined with the functional coating (which can be a hydrophilic oleophobic coating or a lipophilic hydrophobic coating) coated on its outside, allows the filtrate to permeate while efficiently intercepting tiny impurity particles in the water, ensuring that the filtered water quality reaches a high standard. The fixed connection between the upper connector and the filter cartridge enhances the overall structural stability of the filter element, enabling the filter element to withstand higher working pressures and fluid impacts. The fixed connection between the fine filtrate pipe and the upper connector ensures that the fluid can flow out of the filter element smoothly, preventing leakage and pollution.

[0018] Further, the number of the second filter elements is multiple, and a second adapter pipe for connecting the fine filtrate pipe to each of the upper connectors is provided in the second tank; The second adapter pipe includes a second transfer main pipe for connecting to the fine filtrate pipe and a plurality of second transfer branch pipes for respectively connecting to each of the upper connectors in one-to-one correspondence. The end portions of the second transfer branch pipes away from the upper connectors are all connected to the second transfer main pipe, and the fine filtrate pipe is connected to the second transfer main pipe.

[0019] By adopting the above technical solution, the simultaneous use of multiple second filter elements increases the filtration area, enables more water to be treated in a shorter time or higher-concentration pollutants to be treated, while maintaining a high standard of the effluent water quality, improving the filtration capacity and treatment efficiency of the system. The integrated design of the second adapter pipe connects the fine filtrate pipe to multiple second filter elements, simplifying the overall structure of the system.

[0020] Further, an aeration assembly is further included. The aeration assembly includes a first aeration pipe penetrating and communicating with the outer wall of the first tank, a second aeration pipe penetrating and communicating with the outer wall of the second tank, and an aeration main pipe for communicating the first aeration pipe and the second aeration pipe and for connecting to an air pump. One-way valve bodies are provided on both the first aeration pipe and the second aeration pipe.

[0021] By adopting the above technical solution, when the bubbles generated by aeration rise in water, they will drive the surrounding water flow to move, thereby improving the hydrodynamic conditions in the tank, helping to reduce dead zones, increasing the fluid mixing degree, enabling the filter medium to fully contact with the water flow, and thus improving the filtration efficiency. The setting of the one-way valve body ensures that the gas can only flow unidirectionally, entering the first aeration pipe and the second aeration pipe from the air pump through the main aeration pipe, and then entering the tank. This prevents the water or other fluids in the tank from flowing back to the air pump or other components through the aeration pipe, thus avoiding potential pollution and damage.

[0022] Furthermore, a first liquid distribution pipe is provided at the lower part of the first tank, and the first liquid distribution pipe is communicated with the first aeration pipe. The first liquid distribution pipe is spirally wound around the lower part of the first filter element. A second liquid distribution pipe is provided at the lower part of the second tank, and the second liquid distribution pipe is communicated with the second aeration pipe. The second liquid distribution pipe is spirally wound around the lower part of the second filter element.

[0023] By adopting the above technical solution, the spirally arranged first liquid distribution pipe and second liquid distribution pipe can ensure the uniform distribution of the fluid at the lower part of the filter element, avoiding problems such as local overload and fluid short-circuit. At the same time, the gas input into the tank by the aeration pipe can form bubbles under the filter element through the liquid distribution pipe, enabling the fluid to contact the filter element more fully. When the bubbles burst on the surface of the filter element, it helps to remove the droplets coalesced on the surface of the filter element.

[0024] Furthermore, a three-way sampling pipe is provided between the first tank and the second tank. The three-way sampling pipe has a first connecting pipe for communicating with the first tank, a second connecting pipe for communicating with the second tank, and a sampling branch pipe for connecting a sampling container. One-way valve bodies are provided on the first connecting pipe, the second connecting pipe, and the sampling branch pipe.

[0025] By adopting the above technical solution, the setting of the three-way sampling pipe enables the operator to sample from different tanks respectively, which helps to better understand the fluid conditions in the tanks and provides a basis for subsequent process adjustment and optimization. One-way valve bodies are provided on the first connecting pipe, the second connecting pipe, and the sampling branch pipe to prevent the fluid from flowing back during the sampling process, thus ensuring the safety and accuracy of sampling. At the same time, it prevents external pollutants from entering the tank and maintains the cleanliness and stability of the system.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the two-stage filtration mechanism of preliminary coalescence filtration and precision coalescence filtration, combined with filter elements of different precisions and functional coatings (such as hydrophilic and oleophobic or oleophilic and hydrophobic coatings), efficient separation of crude oil and water is achieved, which can improve the separation efficiency more than a single filtration step. 2. The parallel use of multiple first filters and multiple second filters increases the filtration area, improves the processing capacity and efficiency of the system, and also helps to disperse the filtration load and extend the service life of a single filter element, ensuring the complete separation of crude oil from water. Check valves are installed on pipelines such as the inlet pipe, transfer pipe, fine-filtered liquid outlet pipe, oil drain pipe, and drain pipe to ensure that liquids and gases can only flow in a predetermined direction, avoiding problems of backflow and cross-contamination, and improving the reliability and safety of the system; 3. The swirl effect inside the tank enhances the mixing and separation effects of the liquid, improves the filtration efficiency, helps to carry away the droplets coalesced on the surface of the filter element, and reduces problems of blockage and deposition. The spiral arrangement and integrated design of the aeration pipe and liquid distribution pipe simplify the overall structure of the system, and at the same time ensure the uniform distribution of the fluid below the filter element, improving the filtration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of a double-super swirl air flotation coalescence system according to an embodiment of the present application Figure 1 .

[0028] Figure 2 is a schematic diagram of the overall structure of a double-super swirl air flotation coalescence system according to an embodiment of the present application Figure 2 (hiding the side wall of the tank).

[0029] Figure 3 is a schematic diagram of the overall structure of the first filter element, transfer pipe, and rough-filtered liquid outlet pipe in an embodiment of the present application.

[0030] Figure 4 is a schematic diagram of the overall structure of the first filter element in an embodiment of the present application.

[0031] Figure 5 is a transverse sectional view of the first filter element in an embodiment of the present application.

[0032] Figure 6 is a schematic diagram of the overall structure of the second filter element, fine-filtered liquid outlet pipe, and filter box support in an embodiment of the present application.

[0033] Figure 7 is a longitudinal sectional view of the filter box and upper connector in an embodiment of the present application.

[0034] Figure 8 is a schematic diagram of the structure of the second filter element group installed in the second tank in an embodiment of the present application.

[0035] Description of reference numerals: 1. Preliminary coalescence and filtration device; 11. First tank body; 111. Liquid inlet pipe; 12. First filter element; 121. Upper connection part; 122. Main body framework; 123. Lower connection part; 124. Filter membrane; 13. First adapter pipe; 131. First adapter main pipe; 132. First adapter branch pipe; 14. Transfer pipe; 15. Coarse filtrate pipe; 16. First drain pipe; 17. First drainage pipe; 2. Precision coalescence and filtration device; 21. Second tank body; 211. Fixed convex ring; 22. Second filter element; 221. Filter cartridge; 222. Upper connection head; 23. Second adapter pipe; 231. Second adapter main pipe; 232. Second adapter branch pipe; 24. Fine filtrate pipe; 25. Fixed frame body; 26. Second drain pipe; 27. Second drainage pipe; 28. Discharge main pipe; 3. Aeration assembly; 31. First aeration pipe; 311. First liquid distribution pipe; 32. Second aeration pipe; 321. Second liquid distribution pipe; 33. Aeration main pipe; 4. Three-way sampling pipe; 41. First connection pipe; 42. Second connection pipe; 43. Sampling branch pipe; 5. Check valve body. Detailed implementation manners

[0036] In order to make the purpose, technical solutions and advantages of the present application more clear and understandable, the following further elaborates on the present application in conjunction with Figure 1-8 the accompanying drawings and embodiments.

[0037] The embodiment of the present application discloses a double-supercyclone air flotation coalescence system. Referring to Figure 1 and Figure 2 , the double-supercyclone air flotation coalescence system includes a preliminary coalescence and filtration device 1 for coarsely filtering the raw liquid to be filtered and a precision coalescence and filtration device 2 for finely filtering the coarsely filtered liquid. The preliminary coalescence and filtration device 1 is connected to the precision coalescence and filtration device 2 through pipelines and controls the direction of the fluid through a plurality of check valve bodies 5. Combining Figure 3 , the preliminary coalescence and filtration device 1 includes a first tank body 11 and a first filter element 12 disposed in the first tank body 11. In order to improve the filtration efficiency, a plurality of first filter elements 12 can be arranged in parallel. The number of first filter elements 12 in this embodiment is preferably six.

[0038] Referring to Figure 4 and Figure 5, the first filter element 12 has an upper connection part 121, a main body framework 122 and a lower connection part 123 which are coaxially arranged and integrally connected from top to bottom. A plurality of filter membranes 124 arranged side by side in a circumferential direction are provided along the outer wall of the main body framework 122 in the length direction. The filter membranes 124 are arranged in a uniformly distributed corrugated shape along the outer peripheral wall of the main body framework 122. In this embodiment, the osmotic diameter of the filter membranes 124 can reach 0.5 micrometers. A functional coating is coated on the outside of the filter membranes 124. The functional coating in this embodiment can be a hydrophilic and oleophobic coating or a lipophilic and hydrophobic coating. The lower connection part 123 of each first filter element 12 is fixedly connected to the inner wall of the lower side of the first tank body 11. Among them, the hydrophilic and oleophobic coating can be the nano-modified high-hardness coating (model SJ-1109) of Tongling Sanjin Pigment Co., Ltd., and the lipophilic and hydrophobic coating can be the super-lipophilic and super-hydrophobic coating with the authorization announcement number of CN109518462B by Southeast University.

[0039] Combined with Figure 3 , a first adapter pipe 13 for connecting each first filter element 12 in parallel and for connecting with other pipelines is provided in the first tank body 11. The first adapter pipe 13 is located in the upper part of the first tank body 11. The first adapter pipe 13 includes a first adapter main pipe 131 and six first adapter branch pipes 132 which are communicated with each other and integrally connected. Each first adapter branch pipe 132 is correspondingly connected and fixedly connected to the upper connection part 121 of each first filter element 12. Combined with Figure 2 , a transfer pipe 14 and a rough filtrate pipe 15 are connected to the first adapter main pipe 131.

[0040] Referring to Figure 1 and Figure 2 , a liquid inlet pipe 111 is provided along the tangential direction of the side wall of the first tank body 11, so that when the liquid enters the first tank body 11, a swirling effect can be formed. One end of the transfer pipe 14 far away from the connection with the first adapter main pipe 131 passes through the side wall of the first tank body 11 and is used for inputting the filtrate into the precision coalescence filter device 2, and one end of the rough filtrate pipe 15 far away from the connection with the first adapter main pipe 131 passes through the side wall of the first tank body 11 and is used for outputting the filtrate. A first oil drain pipe 16 is provided at the central position of the top of the first tank body 11, and a first drain pipe 17 is provided on the side wall of the first tank body 11. One-way valve bodies 5 for preventing liquid backflow are installed on the liquid inlet pipe 111, the transfer pipe 14, the rough filtrate pipe 15, the first oil drain pipe 16 and the first drain pipe 17.

[0041] Referring to Figure 2 and Figure 6, the precision coalescing filter device 2 includes a second tank body 21 and a second filter element 22 disposed inside the second tank body 21. One end of the transfer pipe 14 far from the connection with the first transfer main pipe 131 penetrates along the tangential direction of the second tank body 21, so that when the liquid enters the second tank body 21, a swirling effect can be formed. In order to improve the filtration efficiency, a plurality of second filter elements 22 can be arranged in parallel. In this embodiment, the number of the second filter elements 22 is preferably eight.

[0042] Referring to Figure 6 and Figure 7 , the second filter element 22 includes a filter cartridge 221 and an upper connection head 222 fixedly connected to the upper side of the filter cartridge 221. A second transfer pipe 23 for connecting the second filter elements 22 in parallel and for connecting with other pipelines is provided inside the second tank body. The second transfer pipe 23 is located in the upper part of the second tank body 21. The second transfer pipe 23 includes a second transfer main pipe 231 and eight second transfer branch pipes 232 that are interconnected and integrally connected. Each second transfer branch pipe 232 is correspondingly connected and fixedly connected to the upper connection head 222 of each second filter element 22. A fine filtrate outlet pipe 24 is connected to the second transfer main pipe 231. Combining Figure 2 , one end of the fine filtrate outlet pipe 24 far from the connection with the second transfer main pipe 231 penetrates through the side wall of the second tank body 21 and is used for outputting the filtrate.

[0043] In this embodiment, the filter cartridge 221 is preferably made of ceramic material, and its overfiltration diameter can reach 0.1 micron. A functional coating is coated on the outside of the filter cartridge 221. In this embodiment, the functional coating can be selected from a hydrophilic and oleophobic coating or a lipophilic and hydrophobic coating. Combining Figure 8 , a fixing frame body 25 for inserting and fixing each second filter element 22 is provided inside the second tank body 21, and a fixing convex ring 211 for the fixing frame body 25 to abut against is provided on the inner peripheral wall of the second tank body 21.

[0044] Referring to Figure 1 and Figure 2 , a second drain pipe 26 is provided at the central position of the top of the second tank body 21, and a second drain pipe 27 is provided on the side wall of the second tank body 21. One-way valve bodies 5 for preventing liquid backflow are installed on the coarse filtrate outlet pipe 15, the second drain pipe 26 and the second drain pipe 27. A discharge main pipe 28 for connecting the first drain pipe 16, the first drain pipe 17, the second drain pipe 26 and the second drain pipe 27 is provided on one side of the first tank body 11 and the second tank body 21.

[0045] An aeration assembly 3 is further provided between the first tank body 11 and the second tank body 21. The aeration assembly 3 includes a first aeration pipe 31 penetrating and communicating with the outer wall of the first tank body 11, a second aeration pipe 32 penetrating and communicating with the outer wall of the second tank body 21, and an aeration main pipe 33 for connecting the first aeration pipe 31 and the second aeration pipe 32. One-way valve bodies 5 are provided on both the first aeration pipe 31 and the second aeration pipe 32. One end of the aeration main pipe 33 far from the connection with the first aeration pipe 31 and the second aeration pipe 32 is used to connect an air pump. A first liquid distribution pipe 311 is provided at the lower part inside the first tank body 11. The first liquid distribution pipe 311 is communicated with the first aeration pipe 31, and the first liquid distribution pipe 311 is spirally wound around the lower part of the first filter element 12. A second liquid distribution pipe 321 is provided at the lower part inside the second tank body 21. The second liquid distribution pipe 321 is communicated with the second aeration pipe 32, and the second liquid distribution pipe 321 is spirally wound around the lower part of the second filter element 22.

[0046] A three-way sampling pipe 4 is further provided between the first tank body 11 and the second tank body 21. The three-way sampling pipe 4 has a first connection pipe 41 for communicating with the first tank body 11, a second connection pipe 42 for communicating with the second tank body 21, and a sampling branch pipe 43 for connecting a sampling container. One-way valve bodies 5 are provided on the first connection pipe 41, the second connection pipe 42, and the sampling branch pipe 43.

[0047] The implementation principle of a double-super vortex air flotation coalescence system in an embodiment of the present application is as follows: When the functional coatings coated on the first filter element 12 and the second filter element 22 are hydrophilic and oleophobic coatings, the original liquid to be filtered enters the first tank body 11 through the liquid inlet pipe 111, and the water flow enters the inside of the first filter element 12 in an infiltration manner to complete rough filtration. On the one hand, the rough filtrate can enter the second tank body 21 through the transfer pipe 14 for fine filtration. On the other hand, the rough filtrate can also be discharged from the system through the rough filtration effluent pipe 15 according to needs. The oil liquid is left inside the first tank body 11 and floats on the upper part of the first tank body 11. Under the swirling action of the liquid, the oil liquid is discharged through the first oil discharge pipe 16 at the center of the upper part of the first tank body 11. After the rough filtrate enters the second tank body 21, the water flow enters the inside of the second filter element 22 in an infiltration manner to complete fine filtration and is discharged from the system through the fine filtration effluent pipe 24, while the oil liquid is discharged through the second oil discharge pipe 26 at the center of the upper part of the second tank body 21.

[0048] When the functional coatings applied to the first filter element 12 and the second filter element 22 are lipophilic and hydrophobic coatings, the stock solution to be filtered enters the first tank 11 through the liquid inlet pipe 111. The oil liquid enters the interior of the first filter element 12 in an overfiltration manner to complete rough filtration. The rough filtrate is discharged from the system through the rough filtrate outlet pipe 15 or enters the second tank 21 through the transfer pipe 14 for fine filtration, and the remaining water is left inside the first tank 11 and discharged through the first drain pipe 17. After the rough filtrate enters the second tank 21, the oil liquid enters the interior of the second filter element 22 in an overfiltration manner to complete fine filtration and is discharged from the system through the fine filtrate outlet pipe 24, and the remaining water is discharged through the second drain pipe 27.

[0049] The aeration assembly 3 inputs gas into the system, and the liquid distribution pipe transports the gas to the lower part of the filter element. The bubbles burst on the surface of the filter element and carry away the liquid droplets coalesced on the surface of the filter element to prevent the blockage of the filter element. The operator can take samples of the liquid to be filtered in the two tanks through the three-way sampling pipe 4 to detect the fluid conditions in the tanks, so as to provide a basis for subsequent process adjustment and optimization.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A double-super-vortex air flotation coalescence system, characterized in that: It includes a preliminary coalescing and filtering device (1) and a precision coalescing and filtering device (2) which are connected in communication with each other; The preliminary coalescing and filtering device (1) includes a first tank body (11) and a first filter element (12) disposed in the first tank body (11). A functional coating is coated on the outer surface of the first filter element (12). A liquid inlet pipe (111) for inputting the stock solution to be filtered is provided on the outer wall of the first tank body (11). The liquid inlet pipe (111) is arranged along the tangential direction of the first tank body (11). A transfer pipe (14) is connected to the upper end of the first filter element (12); The precision coalescing and filtering device (2) includes a second tank body (21) and a second filter element (22) disposed in the second tank body (21). The filtering accuracy of the second filter element (22) is greater than that of the first filter element (12). A functional coating is coated on the surface of the second filter element (22). One end of the transfer pipe (14) far from the connection with the first filter element (12) passes through the first tank body (11) and enters the second tank body (21). The end of the transfer pipe (14) far from the first tank body (11) is arranged along the tangential direction of the second tank body (21). A refined filtrate outlet pipe (24) is connected to the second filter element (22). One end of the refined filtrate outlet pipe (24) far from the connection with the second filter element (22) passes through the second tank body (21) for outputting the precision filtrate; One-way valve bodies (5) are provided on the liquid inlet pipe (111), the transfer pipe (14) and the refined filtrate outlet pipe (24); 2. The double-super-vortex air flotation coalescence system according to claim 1, characterized in that: A rough filtrate outlet pipe (15) is communicated with the transfer pipe (14) located in the first tank body (11). One end of the rough filtrate outlet pipe (15) far from the connection with the transfer pipe (14) passes through the first tank body (11) for outputting the preliminary filtrate. A one-way valve body (5) is provided on the rough filtrate outlet pipe (15); 3. The dual-super swirl air flotation coalescence system according to claim 1, characterized in that: A first oil drain pipe (16) is provided at the central position above the first tank body (11). A first drain pipe (17) is provided on the side wall of the first tank body (11). A second oil drain pipe (26) is provided at the central position above the second tank body (21). A second drain pipe (27) is provided on the side wall of the second tank body (21). A discharge main pipe (28) for communicating the first oil drain pipe (16), the first drain pipe (17), the second oil drain pipe (26) and the second drain pipe (27) is provided on one side of the first tank body (11) and the second tank body (21). One-way valve bodies (5) are provided on the first oil drain pipe (16), the first drain pipe (17), the second oil drain pipe (26) and the second drain pipe (27); 4. A double-super-vortex air flotation coalescence system according to claim 2, characterized in that: The first filter element (12) includes an upper connection part (121), a main body framework (122), and a lower connection part (123) that are coaxially arranged. The upper connection part (121) and the lower connection part (123) are respectively fixedly connected to the upper and lower ends of the main body framework (122). A plurality of filter membranes (124) arranged side by side are circumferentially provided along the length direction of the outer wall of the main body framework (122), and the functional coating is coated on the outside of each filter membrane (124); The upper connection part (121) is used to connect the transfer pipe (14) and the rough filtrate pipe (15), and the lower connection part (123) is fixedly connected to the inner wall of the lower side of the first tank body (11).

5. A double-super-vortex air flotation coalescence system according to claim 4, characterized in that: The number of the first filter elements (12) is multiple, and a first adapter pipe (13) for connecting the transfer pipe (14) and the rough filtrate pipe (15) to each upper connection part (121) is provided in the first tank body (11); The first adapter pipe (13) includes a first adapter main pipe (131) for connecting with the transfer pipe (14) and the rough filtrate pipe (15), and a plurality of first adapter branch pipes (132) for respectively connecting with each upper connection part (121) in one-to-one correspondence. The ends of each first adapter branch pipe (132) far from each upper connection part (121) are all connected to the first adapter main pipe (131), and the transfer pipe (14) and the rough filtrate pipe (15) are both connected to the first adapter main pipe (131).

6. The dual-super swirl air flotation coalescence system according to claim 1, wherein: The second filter element (22) includes a filter box (221) and an upper connection head (222) fixedly connected to the upper end of the filter box (221). The functional coating is coated on the outside of the filter box (221), and a fixed connection is provided between the refined filtrate pipe (24) and the upper connection head (222).

7. A double-super-vortex air flotation coalescence system according to claim 6, characterized in that: The number of the second filter elements (22) is multiple, and a second adapter pipe (23) for connecting the refined filtrate pipe (24) to each upper connection head (222) is provided in the second tank body (21); The second adapter pipe (23) includes a second transfer main pipe for connecting with the refined filtrate pipe (24), and a plurality of second transfer branch pipes for respectively connecting with each upper connection head (222) in one-to-one correspondence. The ends of each second transfer branch pipe far from each upper connection head (222) are all connected to the second transfer main pipe, and the refined filtrate pipe (24) is connected to the second transfer main pipe.

8. A double-super-vortex air flotation coalescence system according to claim 1, characterized in that: It further includes an aeration assembly (3). The aeration assembly (3) includes a first aeration pipe (31) penetrating and communicating with the outer wall of the first tank body (11), a second aeration pipe (32) penetrating and communicating with the outer wall of the second tank body (21), and an aeration main pipe (33) for communicating the first aeration pipe (31) and the second aeration pipe (32) and for connecting an air pump. One-way valve bodies (5) are provided on both the first aeration pipe (31) and the second aeration pipe (32).

9. A double-super-vortex air flotation coalescence system according to claim 8, characterized in that: A first liquid distribution pipe (311) is provided at the lower part inside the first tank body (11). The first liquid distribution pipe (311) is communicated with the first air diffuser pipe (31), and the first liquid distribution pipe (311) is spirally wound around the lower part of the first filter element (12). A second liquid distribution pipe (321) is provided at the lower part inside the second tank body (21). The second liquid distribution pipe (321) is communicated with the second air diffuser pipe (32), and the second liquid distribution pipe (321) is spirally wound around the lower part of the second filter element (22).

10. A double-super vortex air flotation coalescence system according to claim 1, characterized in that: A three-way sampling pipe (4) is provided between the first tank body (11) and the second tank body (21). The three-way sampling pipe (4) has a first connecting pipe (41) for communicating with the first tank body (11), a second connecting pipe (42) for communicating with the second tank body (21), and a sampling branch pipe (43) for connecting a sampling container. One-way valve bodies (5) are provided on the first connecting pipe (41), the second connecting pipe (42), and the sampling branch pipe (43).

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