Membrane defoaming and filtering device

Abstract

The invention relates to the technical field of gas well defoaming, in particular to a membrane defoaming and filtering device which comprises a defoaming tank and a filter element arranged in the defoaming tank, and the outer surface of the filter element is coated with a hydrophilic and oleophobic coating; a water outlet pipe used for discharging filtered water is arranged at the bottom end of the filter element, the end, away from the end connected with the filter element, of the water outlet pipe penetrates through the bottom of the defoaming tank, and a bubble pipe used for leading bubbles in a gas well into the defoaming tank is arranged at the bottom of the defoaming tank. An exhaust pipe used for exhausting gas is arranged at the upper end of the filter element, and the end, away from the end connected with the filter element, of the exhaust pipe penetrates through the top of the defoaming tank. The method has the effect of solving the problem of environmental pollution caused by direct drainage of gas field water.

Description

Technical Field

[0001] The present application relates to the technical field of gas well defoaming, and in particular to a membrane defoaming filtration device. Background Art

[0002] During the development of natural gas, gas wells usually produce a small amount of gas field water. Due to the small amount of gas field water, it cannot be directly extracted by pumping.

[0003] In the related art, it is necessary to first add a foaming agent to the gas field water, then introduce high-pressure air to convert the gas field water into foam, and then extract the foam from the gas well. In the subsequent foam treatment process, it is necessary to add a defoaming agent to the foam for defoaming.

[0004] Regarding the above-mentioned related technologies, on the one hand, a large amount of defoaming agent needs to be invested, and on the other hand, the gas field water also contains some crude oil, and direct discharge will cause environmental pollution. Summary of the invention

[0005] In order to improve the problem of environmental pollution caused by direct discharge of gas field water, the present application provides a membrane defoaming filtration device.

[0006] The membrane defoaming filtration device provided in this application adopts the following technical solution: A membrane defoaming filtration device comprises a defoaming tank and a filter element arranged inside the defoaming tank, wherein the outer surface of the filter element is coated with a hydrophilic and oleophobic coating; The filter element is provided with an outlet pipe for discharging filtered water at the bottom end, and the outlet pipe passes through the bottom of the defoaming tank away from the end connected to the filter element. The defoaming tank is provided with a bubble tube at the bottom for passing bubbles in the gas well into the defoaming tank. The filter element is provided with an exhaust pipe for discharging gas at the upper end, and the exhaust pipe passes through the top of the defoaming tank away from the end connected to the filter element.

[0007] By adopting the above technical solution, the foamy gas field water extracted from the gas well by the bubble tube enters the defoaming tank and gradually overflows. When the bubble contacts the filter element, the outer surface of the filter element is coated with a layer of hydrophilic and oleophobic coating, so that water and gas can pass through the filter element wall and enter the inside of the filter element, wherein the gas is discharged from the exhaust pipe at the top, and the filtered water forms a water flow and is discharged from the drain pipe below. Small oil droplets are separated by the coating on the outside of the filter element and gradually coalesce into large oil droplets, and then fall off from the coating surface, merge into the foam below and filter again. The physical filtration method of gas field water can not only save the operation of adding a large amount of defoaming agent and reduce pollution to the environment, but also the discharged water contains a large amount of foaming agent inside. As long as the water is treated by impurity removal and concentration, it can be reused in the gas well for foaming operation, thereby reducing the waste of resources.

[0008] Furthermore, the filter element includes an upper connecting part, a skeleton and a lower connecting part that are coaxially and integrally connected, the upper connecting part and the lower connecting part are respectively arranged at the upper and lower ends of the skeleton, the outer wall of the skeleton is circumferentially provided with a plurality of filter membranes arranged in parallel along the length direction, and the hydrophilic and oleophobic coating is coated on the outside of each filter membrane.

[0009] By adopting the above technical solution, the circumferentially arranged filter membranes can increase the roughness and surface area of ​​the outer surface of the filter element, so that the contact between the bubbles and the filter element is more complete, thereby improving the efficiency of water and gas penetrating the filter element wall. At the same time, the gaps between the filter membranes also provide more opportunities for the aggregation of small oil droplets, which helps the oil droplets fall off the coating surface and improves the oil-water separation effect. The filter membrane helps to guide the bubbles and water flow along a specific path, making it easier for the gas to be discharged from the top, and the filtered water can be discharged smoothly from the bottom, reducing the retention and turbulence of the fluid inside the filter element and improving the filtration efficiency. The filter membrane structure not only enhances the mechanical strength of the filter element, but also makes the coating adhere more firmly to the surface of the filter element, reducing the risk of coating peeling or wear, thereby extending the service life of the device.

[0010] Furthermore, the defoaming tank is provided with an oil drain pipe at the bottom for discharging crude oil.

[0011] By adopting the above technical solution, adding an oil drain pipe can effectively separate and discharge the crude oil in the gas field water. In the traditional treatment process, after adding a large amount of foaming agent and defoaming agent, the crude oil will be converted into sludge due to its chemical reaction, and then discharged together with the wastewater, causing waste of resources and environmental pollution. The setting of the oil drain pipe enables the crude oil to be collected separately, and the treatment method of this solution does not add a large amount of defoaming agent, so the crude oil can maintain its original properties, which is convenient for recycling and processing, improves the recovery rate of crude oil, and reduces resource waste.

[0012] Furthermore, the defoaming tank includes a tank body and an upper blind plate and a lower blind plate flange-connected to both ends of the tank body; the upper blind plate is passed through and fixedly connected to an upper pipe seat for installing the exhaust pipe at a middle position; the lower blind plate is passed through and fixedly connected to a lower pipe seat for installing the water outlet pipe at a middle position.

[0013] By adopting the above technical solution, the upper blind plate and the lower blind plate are fastened to the tank body by flange connection, the overall structural strength of the defoaming tank is improved, the sealing between the components is ensured, and the leakage of gas or liquid is prevented. The stable structural setting can withstand greater working pressure and fluid impact, and ensure the long-term stable operation of the device. Through the setting of flange connection and pipe seat, the installation of exhaust pipe and water outlet pipe becomes simple and quick. At the same time, when it is necessary to clean, replace the filter element or perform other maintenance work, it is also convenient to disassemble and assemble various components, reducing the difficulty and cost of maintenance. The upper pipe seat and the lower pipe seat allow gas and liquid to flow smoothly along the predetermined path. The gas enters the exhaust pipe through the upper pipe seat and is discharged, while the filtered water enters the water outlet pipe through the lower pipe seat and is discharged, optimizing the fluid flow path, reducing the retention and turbulence of the fluid inside the device, and improving the filtration efficiency.

[0014] Furthermore, one end of the water outlet pipe is fixedly connected to the lower connecting portion, and one end of the water outlet pipe away from the lower connecting portion is fixedly connected to the lower pipe seat; One end of the exhaust pipe is fixedly connected to the upper connecting portion, and one end of the exhaust pipe away from the upper connecting portion is fixedly connected to the upper pipe seat.

[0015] By adopting the above technical solution, the water outlet pipe and the exhaust pipe are directly fixedly connected to the upper and lower connecting parts of the filter element, and then respectively passed through the lower pipe seat and the upper pipe seat to be fixed to the lower blind plate and the upper blind plate. This multi-layer connection method enhances the stability of the connection, ensures the stability of the fluid during the transmission process, and reduces the risk of leakage caused by loose connections. Since the water outlet pipe and the exhaust pipe are fixedly connected with the lower pipe seat and the upper pipe seat when passing through them, it helps to optimize the sealing performance, ensure the sealing of the connection, prevent gas or liquid from leaking during the transmission process, and thus ensure the filtering effect.

[0016] Furthermore, a liquid distribution pipe connected to the bubble tube and used for guiding bubbles is provided in the tank body on the upper side of the lower blind plate.

[0017] By adopting the above technical solution, the arrangement of the liquid distribution pipe enables the foam entering from the bubble tube to flow smoothly to the vicinity of the filter element along a predetermined path. On the one hand, it can prevent the foam from being lost or defoamed directly from the oil drain pipe, affecting the filtering effect. On the other hand, it can also prevent the bubbles from being diffused and accumulated disorderly in the tank, reduce the interference of bubbles on the filtering process, and improve the filtering efficiency. Through the guidance of the liquid distribution pipe, the bubbles can be more evenly distributed around the filter element, increasing the contact area and contact time between the bubbles and the outer surface of the filter element, helping the water and gas in the bubbles to pass through the filter element wall, and improving the defoaming and filtering effects.

[0018] Furthermore, the oil drain pipe is installed on the lower blind plate, and an oil drain valve for controlling opening and closing is provided at the position where the oil drain pipe extends out of the lower blind plate.

[0019] By adopting the above technical solution, the oil drain valve makes the control of the oil drain process more precise, and the oil drain valve can be opened or closed at an appropriate time point according to actual needs. When the oil drain valve is closed, it can prevent crude oil from leaking from the oil drain pipe on the one hand, and prevent foam from flowing out of the oil drain pipe on the other hand, which helps to improve the filtering effect.

[0020] Furthermore, the water outlet pipe is connected to a drainage switching pipe at the position where it extends out of the lower blind plate, and the diameter of the drainage switching pipe is smaller than the diameter of the water outlet pipe.

[0021] By adopting the above technical solution, the diameter of the drainage transfer pipe is smaller than the diameter of the outlet pipe. According to the principle of fluid mechanics, the flow rate of the fluid will increase when passing through a pipe with a smaller diameter. Increasing the fluid flow rate at the outlet without increasing the pumping pressure will help to discharge the filtered liquid more efficiently. By adjusting the diameter of the drainage transfer pipe, the outlet flow rate can be controlled to a certain extent to adapt to different treatment needs or process requirements. In some cases, if the pressure in the outlet pipe suddenly decreases (such as when the pump stops working), backflow may occur. The drainage transfer pipe can reduce the possibility of backflow to a certain extent. The smaller diameter makes the flow of the fluid in the pipe more stable. The drainage transfer pipe can also serve as a barrier to reduce the possibility of external impurities or contaminants entering the outlet pipe, thereby protecting downstream equipment and treatment processes from contamination.

[0022] Furthermore, the drainage adapter tube is detachably connected with a backwash mechanism at one end away from the water outlet pipe.

[0023] By adopting the above technical solution, the reverse flushing mechanism injects cleaning liquid or clean water into the drain adapter and allows it to flow through the filter element in the opposite direction of normal filtration, thereby effectively removing dirt and blockages on the surface of the filter element. Compared with traditional forward cleaning, it is more thorough and improves cleaning efficiency. The detachable connection between the reverse flushing mechanism and the drain adapter makes the cleaning process more flexible and convenient. When cleaning is required, the reverse flushing mechanism can be quickly connected to the drain adapter and then removed after cleaning is completed, without interfering with the normal operation of the device.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. By coating the outer surface of the filter with a hydrophilic and oleophobic coating, water and gas in the foam can be effectively penetrated, and small oil droplets are blocked, causing them to coalesce into large oil droplets and then fall off, thereby improving the efficiency of oil-water separation. The circumferentially arranged filter membrane increases the roughness and surface area of ​​the outer surface of the filter element, improves the contact efficiency between the air bubbles and the filter element, promotes the coalescence and shedding of small oil droplets, and further improves the oil-water separation effect; 2. Since the filtered water contains foaming agent, it can be reused in the gas well after impurity removal and concentration treatment, which reduces resource waste and environmental pollution. The additional oil discharge pipe effectively separates and collects crude oil in the gas field water, avoiding resource waste and environmental pollution caused by crude oil being discharged with wastewater, and improving the recovery rate of crude oil; 3. The detachable connection between the backwash mechanism and the drain transfer pipe makes the cleaning operation more flexible, does not interfere with the normal operation of the device, and improves the maintenance efficiency and service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of a membrane defoaming filtration device according to Example 1 of the present application.

[0026] Figure 2 It is a schematic diagram of the overall structure of the membrane defoaming filtration device in Example 1 of the present application.

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure of the membrane defoaming filtration device in Example 1 of the present application.

[0028] Figure 4 It is a schematic diagram of the overall structure of the filter element in Example 1 of the present application.

[0029] Figure 5 It is a schematic diagram of the overall structure of a membrane defoaming filtration device according to Example 2 of the present application.

[0030] Explanation of the reference numerals: 1. frame; 2. defoaming tank; 21. tank body; 22. upper blind plate; 23. lower blind plate; 24. upper pipe seat; 25. lower pipe seat; 3. filter element; 31. hydrophilic and oleophobic coating; 32. upper connecting part; 33. skeleton; 331. filter membrane; 34. lower connecting part; 4. bubble tube; 41. liquid distribution pipe; 5. water outlet pipe; 51. drain adapter pipe; 52. quick connector; 6. exhaust pipe; 61. exhaust adapter pipe; 62. pressure relief pipe; 7. oil drain pipe; 71. oil drain valve; 8. reverse flushing mechanism; 81. flushing pipe; 82. pump body. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of this application more clear, the following is combined with Example 1, Example 2 and the attached Figure 1-5 , further details of this application are given.

[0032] Example 1 Reference Figure 1 and Figure 2 The present invention provides a membrane defoaming filtration device, comprising a frame 1, a defoaming tank 2, a filter element 3, a bubble tube 4, a water outlet pipe 5, an exhaust pipe 6 and an oil drain pipe 7 arranged on the defoaming tank 2. The defoaming tank 2 is installed on the frame 1 in a vertical direction, and is combined with Figure 3 The filter element 3 is located inside the defoaming tank 2, and the outer surface of the filter element 3 is coated with a hydrophilic and oleophobic coating 31. The bubble tube 4 is connected to the gas well to introduce the gas field water foam in the gas well into the defoaming tank 2, the filtered water is discharged from the water outlet pipe 5, the filtered crude oil is discharged from the oil discharge pipe 7, and the gas is discharged from the exhaust pipe 6.

[0033] Reference Figure 3 and Figure 4 The filter element 3 includes a coaxially arranged upper connecting portion 32, a skeleton 33 and a lower connecting portion 34. The upper connecting portion 32 and the lower connecting portion 34 are respectively connected to the upper and lower ends of the skeleton 33. The skeleton 33 is used to defoam and filter the foamy gas field water. The upper connecting portion 32 and the lower connecting portion 34 are respectively used to connect to the upper and lower ends of the defoaming tank 2.

[0034] The outer wall of the skeleton 33 is provided with a plurality of filter membranes 331 arranged in parallel along the length direction, and the hydrophilic and oleophobic coating 31 is coated on the outside of each filter membrane 331. The provision of multiple filter membranes 331 increases the friction and contact area between the foam and the coating, and increases the probability of the foam hanging on the wall outside the coating, thereby improving the defoaming, filtering and separation effects on the gas field water foam. In this embodiment, each filter membrane 331 can optimize the flow path of the foam on the surface of the skeleton 33 and improve the defoaming effect. The filter membrane 331 can also improve the fluid dynamics performance by increasing the sharpness of the edge, which helps to break the bubble and improve the separation efficiency.

[0035] The defoaming tank 2 includes a tank body 21 and an upper blind plate 22 and a lower blind plate 23 which are flange-connected to the upper and lower ends of the tank body 21. The upper blind plate 22 is penetrated at the middle position and fixedly connected to an upper pipe seat 24 for installing the exhaust pipe 6. The lower blind plate 23 is penetrated at the middle position and fixedly connected to a lower pipe seat 25 for installing the water outlet pipe 5.

[0036] The lower end of the exhaust pipe 6 is fixedly connected to the upper connecting portion 32 of the filter element 3, and the upper end of the exhaust pipe 6 is fixedly connected to the upper pipe seat 24. The upper end of the upper pipe seat 24 passes through the upper blind plate 22 so that the exhaust pipe 6 is connected to the outside of the defoaming tank 2.

[0037] The upper pipe seat 24 is fixedly connected at the center with an exhaust adapter pipe 61 connected to the exhaust pipe 6. The diameter of the exhaust adapter pipe 61 is smaller than the diameter of the exhaust pipe 6. The exhaust adapter pipe 61 can be used to connect with a gas collection device to facilitate subsequent processing and discharge. The upper blind plate 22 is provided with a pressure relief pipe 62 for balancing the air pressure in the defoaming tank 2 at an adjacent position where the upper pipe seat 24 is passed.

[0038] The upper end of the water outlet pipe 5 is fixedly connected to the lower connecting portion 34 of the filter element 3, and the lower end of the water outlet pipe 5 is fixedly connected to the lower pipe seat 25. The lower end of the lower pipe seat 25 passes through the lower blind plate 23 so that the water outlet pipe 5 is connected to the outside of the defoaming tank 2.

[0039] The lower pipe seat 25 is fixedly connected at the center with a drainage adapter tube 51 connected to the water outlet pipe 5. The diameter of the drainage adapter tube 51 is smaller than the diameter of the water outlet pipe 5. The drainage adapter tube 51 can be used to connect with a liquid collection device to facilitate subsequent processing and discharge.

[0040] The bubble tube 4 is arranged at an adjacent position of the lower blind plate 23 through which the lower tube seat 25 is provided. The lower end of the bubble tube 4 is used to be connected to the gas well, and the upper end of the bubble tube 4 protrudes from the upper side of the lower blind plate 23. The upper end of the bubble tube 4 is detachably connected with a liquid distribution tube 41. The liquid distribution tube 41 in this embodiment is preferably a hose with deformation ability. The liquid distribution tube 41 is extended upward in a spiral shape, and the upper end of the liquid distribution tube 41 is located at the skeleton 33 of the filter element 3. The liquid distribution tube 41 is connected to the bubble tube 4 to guide the foam to the skeleton 33 of the filter element 3.

[0041] The oil drain pipe 7 is arranged at a position adjacent to the lower blind plate 23 where the lower pipe seat 25 is penetrated, and the positions of the oil drain pipe 7 and the bubble tube 4 are centrally symmetrical about the central axis of the drain pipe. The upper end of the oil drain pipe 7 is fixedly connected to the lower blind plate 23, and the upper end of the oil drain pipe 7 is flush with the lower blind plate 23. The oil drain pipe 7 is provided with an oil drain valve 71 for controlling opening and closing at the position extending from the lower blind plate 23.

[0042] The implementation principle of this embodiment is as follows: the foamy gas field water in the gas well enters the defoaming tank 2 through the bubble tube 4, and the liquid distribution tube 41 guides the foam to the skeleton 33 of the filter element 3. When the foam passes through the skeleton 33 of the filter element 3, due to the action of the filter membrane 331 and the hydrophilic oleophobic coating 31, the bubbles burst, the water molecules pass through the coating and flow down along the filter element 3, and the crude oil is separated to the outside of the filter element 3 due to the oleophobicity. After the water is filtered by the filter element 3, it is discharged from the outlet pipe 5. At this time, the filtered water still contains a large amount of defoaming agent, and the drainage transfer pipe 51 is connected to the liquid collection device to realize the subsequent treatment of the liquid, which is convenient for recycling the defoaming agent. The gas is discharged through the filter element 3 and the exhaust pipe 6, and the exhaust transfer pipe 61 is convenient for connecting with the gas collection device for subsequent treatment or discharge. The separated crude oil accumulates outside the filter element 3 and can be discharged through the oil discharge pipe 7. The oil discharge valve 71 controls the oil discharge process to ensure accurate control of the discharge.

[0043] Example 2 Reference Figure 5 The difference between this embodiment and embodiment 1 is that a quick connector 52 is provided at the end of the drainage transfer pipe 51 away from the water outlet pipe 5, and the drainage transfer pipe 51 can be quickly connected to the liquid collection and processing device through the quick connector 52.

[0044] A backwash mechanism 8 is provided on one side of the frame 1. The backwash mechanism 8 includes a flushing pipe 81 and a pump body 82 provided on the flushing pipe 81. One end of the flushing pipe 81 is detachably connected to the water outlet pipe 5 through a quick connector 52. The other end of the flushing pipe 81 is for the washing liquid to pass through. The backwash mechanism 8 enables the filter to perform self-cleaning regularly, effectively removes impurities on the filter element, thereby avoiding blockage, improving its filtering efficiency, and ensuring the stable operation of the device.

[0045] This embodiment further optimizes the hydrophilic and oleophobic coating 31 in the filter element 3. The hydrophilic and oleophobic coating 31 can be realized not only by materials such as polyurethane and polytetrafluoroethylene, but also by using nano-coating technology, using materials with high hydrophilicity and low surface energy, such as nano-coatings made of a composite material of silicon dioxide and polytetrafluoroethylene. This coating can provide better hydrophilic and oleophobic properties without increasing too much thickness, thereby further improving the foam bursting efficiency and further improving the working performance of the overall device.

[0046] The implementation principle of this embodiment is as follows: This embodiment adds a quick connector 52 to the end of the drainage transfer pipe 51 away from the outlet pipe 5, so that the drainage transfer pipe 51 can be easily connected and disconnected with the liquid collection and processing device, thereby improving the operating efficiency and facilitating the maintenance and replacement of the equipment. A reverse flushing mechanism 8 is added to one side of the frame 1, and the flushing pipe 81 is connected to the outlet pipe 5 through the quick connector 52, and the other end is used to pass the cleaning liquid. The pump body 82 drives the cleaning liquid to flow through the filter element 3 in reverse to perform regular self-cleaning of the filter element. The reverse flushing mechanism can effectively remove impurities on the filter element and avoid clogging of the filter element, thereby ensuring the continuous and efficient filtering capacity of the filter element, extending the service life of the equipment, and improving the stability and operating efficiency of the overall device.

[0047] This embodiment has upgraded the hydrophilic and oleophobic coating 31 on the filter element 3 by using nano coating technology. The nano coating is made of materials with high hydrophilicity and low surface energy (such as a composite material of silicon dioxide and polytetrafluoroethylene), which can significantly improve the hydrophilic and oleophobic properties of the coating without increasing the thickness of the coating.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A membrane defoaming filtration device, characterized in that: It comprises a defoaming tank (2) and a filter element (3) arranged inside the defoaming tank (2), wherein the outer surface of the filter element (3) is coated with a hydrophilic and oleophobic coating (31); The filter element (3) is provided with a water outlet pipe (5) at the bottom end for discharging filtered water, and the end of the water outlet pipe (5) away from the connection with the filter element (3) passes through the bottom of the defoaming tank (2), and the defoaming tank (2) is provided with a bubble tube (4) at the bottom for passing bubbles in the gas well into the defoaming tank (2), and the filter element (3) is provided with an exhaust pipe (6) at the upper end for discharging gas, and the end of the exhaust pipe (6) away from the connection with the filter element (3) passes through the top of the defoaming tank (2).

2. A membrane defoaming filtration device according to claim 1, characterized in that: The filter element (3) comprises an upper connecting portion (32), a frame (33) and a lower connecting portion (34) which are coaxially connected in one piece, the upper connecting portion (32) and the lower connecting portion (34) being respectively arranged at the upper and lower ends of the frame (33), the outer wall of the frame (33) being circumferentially provided with a plurality of filter membranes (331) arranged in parallel along the length direction, and the hydrophilic and oleophobic coating (31) being coated on the outside of each of the filter membranes (331).

3. A membrane defoaming filtration device according to claim 2, characterized in that: The defoaming tank (2) is provided with an oil discharge pipe (7) at the bottom for discharging crude oil.

4. A membrane defoaming filtration device according to claim 3, characterized in that: The defoaming tank (2) comprises a tank body (21) and an upper blind plate (22) and a lower blind plate (23) connected to both ends of the tank body (21) by flanges; the upper blind plate (22) is provided at a middle position and fixedly connected with an upper pipe seat (24) for mounting the exhaust pipe (6); the lower blind plate (23) is provided at a middle position and fixedly connected with a lower pipe seat (25) for mounting the water outlet pipe (5).

5. A membrane defoaming filtration device according to claim 4, characterized in that: One end of the water outlet pipe (5) is fixedly connected to the lower connecting portion (34), and one end of the water outlet pipe (5) away from the lower connecting portion (34) is fixedly connected to the lower pipe seat (25); One end of the exhaust pipe (6) is fixedly connected to the upper connecting portion (32), and one end of the exhaust pipe (6) away from the upper connecting portion (32) is fixedly connected to the upper pipe seat (24).

6. A membrane defoaming filtration device according to claim 4, characterized in that: A liquid distribution pipe (41) is provided on the upper side of the lower blind plate (23) in the tank body (21) and is connected to the bubble tube (4) and used for guiding bubbles.

7. A membrane defoaming filtration device according to claim 4, characterized in that: The oil drain pipe (7) is installed on the lower blind plate (23); the oil drain pipe (7) is extended out of the lower blind plate (23) and is provided with an oil drain valve (71) for controlling opening and closing.

8. A membrane defoaming filtration device according to claim 5, characterized in that: The water outlet pipe (5) is connected to a drainage transfer pipe (51) at a position where the water outlet pipe (5) extends out of the lower blind plate (23); the diameter of the drainage transfer pipe (51) is smaller than the diameter of the water outlet pipe (5).

9. A membrane defoaming filtration device according to claim 8, characterized in that: The drainage transfer pipe (51) is detachably connected to a reverse flushing mechanism (8) for flushing the frame (33) at one end away from the water outlet pipe (5).

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