Continuous online water-oil separation device

Abstract

The invention relates to the technical field of water-oil separation, in particular to a continuous online water-oil separation device which comprises a frame, a tank arranged on the frame in the vertical direction and a filter element arranged in the tank, and the outer surface of the filter element is coated with a functional coating; the side wall of the tank body is connected with a liquid inlet pipe used for introducing an oil-water mixture, the bottom end of the filter element is provided with a water outlet pipe used for penetrating through the bottom of the tank body and discharging filtered water, and the upper end of the filter element is provided with an oil outlet pipe used for penetrating through the top of the connecting cylinder and discharging oil; the water outlet pipe and the oil outlet pipe are both provided with adjusting valves used for controlling connection and disconnection of pipelines. The oil-water separation device has the effects of thoroughly separating water and oil and improving the water-oil separation efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of water-oil separation, and particularly to a continuous online water-oil separation device. Background Art

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

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

[0004] In view of the above 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 thoroughly separate water and oil and improve the water-oil separation efficiency, the present application provides a continuous online water-oil separation device.

[0006] The continuous online water-oil separation device provided by the present application adopts the following technical solutions: A continuous online water-oil separation device includes a frame, a tank body arranged in the frame in the vertical direction, and a filter element arranged in the tank body. A functional coating is coated on the outer surface of the filter element; A liquid inlet pipe for introducing an oil-water mixture is connected to the side wall of the tank body. A water outlet pipe for passing through the bottom of the tank body and discharging the filtered water is arranged at the bottom end of the filter element. An oil outlet pipe for passing through the top of the connecting cylinder and discharging the oil liquid is arranged at the upper end of the filter element. Control valves for controlling the on-off of the pipeline are arranged on both the water outlet pipe and the oil outlet pipe.

[0007] By adopting the above technical solutions, the frame provides support for the tank body and allows the tank body to be arranged in the vertical direction. The filter element is arranged inside the tank body. A functional coating is coated on the outer surface of the filter element. The coating has oleophilic-hydrophobic or hydrophilic-oleophobic properties, which can effectively help separate water and oil in the oil-water mixture, accelerate the water-oil separation process, and improve the separation efficiency. A liquid inlet pipe is connected to the side wall of the tank body for introducing the oil-water mixture. A water outlet pipe is arranged at the bottom end of the filter element. The water outlet pipe passes through the bottom of the tank body for discharging the filtered water. An oil outlet pipe is arranged at the upper end of the filter element. The oil outlet pipe passes through the connecting cylinder for discharging the separated oil liquid. Control valves are arranged on both the water outlet pipe and the oil outlet pipe for controlling the on-off of the pipeline. The separation device of the present application works continuously online, can continuously process the oil-water mixture, improve the separation efficiency, greatly reduce the amount of crude oil remaining in the discharged water, help reduce environmental pollution, and protect the ecological environment.

[0008] Furthermore, the filter element includes a top joint, a skeleton, and a bottom joint arranged coaxially. The top joint and the bottom joint are integrally connected to the upper and lower ends of the skeleton respectively. A plurality of filter membranes arranged side by side are circumferentially annularly provided along the length direction of the outer wall of the skeleton, and the functional coating is coated on the outside of each filter membrane.

[0009] By adopting the above technical solution, the filter element includes three main parts: a top joint, a skeleton, and a bottom joint. The three parts are arranged coaxially, and the top joint and the bottom joint are integrally connected to the upper and lower ends of the skeleton respectively, ensuring the structural stability and integrity of the filter element and facilitating the connection and fixation of the filter element with the tank body and other components. A plurality of filter membranes arranged side by side are circumferentially annularly provided along the length direction of the outer wall of the skeleton. The filter membranes increase the surface area of the skeleton, provide more attachment points for the functional coating, and also increase the contact area between the oil-water mixture and the functional coating, improving the efficiency of water-oil separation.

[0010] Furthermore, a circulation pipe for discharging the oil-water mixture is connected to the side wall of the tank body. The circulation pipe is connected with a circulation pump, and a circulation regulating valve for controlling the on-off is installed on the circulation pipe.

[0011] By adopting the above technical solution, as the main component of the continuous online water-oil separation device, the tank body provides the installation space for the filter element on the one hand, and on the other hand, realizes the circulation treatment of the oil-water mixture through the connection of the circulation pipe on the side wall. The circulation pipe enables the oil-water mixture to be filtered and separated multiple times inside the device, thereby further improving the separation efficiency. One end of the circulation pipe is connected to the side wall of the tank body for discharging the oil-water mixture, and the other end is connected to the circulation pump. The power is provided by the circulation pump to make the oil-water mixture form a circulating flow inside the device, ensuring that the oil-water mixture can fully contact the functional coating on the filter element, thereby accelerating the water-oil separation process. The circulation regulating valve is installed on the circulation pipe for controlling the on-off of the circulation pipe. By adjusting the opening degree of the circulation regulating valve, the circulation time and cycle of the oil-water mixture can be flexibly controlled to adapt to different separation requirements and working conditions.

[0012] Furthermore, the tank body includes a main tank, an upper connection tank and a lower connection tank which are arranged coaxially and fixedly connected to the upper and lower ends of the main tank respectively. The liquid inlet pipe is connected to the upper connection tank, and the circulation pipe is connected to the lower connection tank.

[0013] By adopting the above technical solution, the tank body includes three parts: a main tank, an upper connecting tank, and a lower connecting tank. The main tank is usually made of glass material, which is cylindrical and used to accommodate the filter element. It is the main part of the tank body, ensuring that the filter element can be smoothly installed and operate normally. The material of the main tank is special and it is not convenient to drill holes and connect other pipelines. The upper connecting tank and the lower connecting tank are coaxially arranged and fixedly connected to the upper and lower ends of the main tank respectively, enabling the tank body to be connected to other components such as the liquid inlet pipe and the circulation pipe, and ensuring the stability and reliability of the connection.

[0014] Further, the liquid inlet pipe is arranged along the tangent direction of the upper connecting tank, and the circulation pipe is arranged along the tangent direction of the lower connecting tank.

[0015] By adopting the above technical solution, both the liquid inlet pipe and the circulation pipe are arranged along the tangent direction of their respective connecting cylinders (the upper connecting tank and the lower connecting tank). When the oil-water mixture enters the upper connecting tank along the tangent direction through the liquid inlet pipe, a swirl flow will be formed in the main tank. The swirl flow state helps the coalescence and separation of water droplets on the surface of the filter element. Due to the action of centrifugal force, the water droplets will be thrown towards the outer wall of the filter element and flow downward along the surface of the filter element, and finally be discharged. Using the principle of fluid dynamics, the flow state of the oil-water mixture inside the device is optimized, thereby improving the separation efficiency. The liquid inlet pipe is arranged along the tangent direction, and the formed swirl flow helps to timely remove the water droplets coalesced on the surface of the filter element, effectively avoiding the problem of filter element blockage and prolonging the service life of the filter element.

[0016] Further, the number of oil-water separation devices is two. The two groups of oil-water separation devices are respectively defined as the first separation device and the second separation device. The functional coating in the first separation device is an oleophilic and hydrophobic coating, and the functional coating in the second separation device is a hydrophilic and oleophobic coating; It also includes a shunt system for cooperating with the two groups of oil-water separation devices. The shunt system includes an analysis mechanism for detecting the water and oil content in the oil-water mixture and a three-way shunt pipe. The three-way shunt pipe has a main pipe for introducing the oil-water mixture, a first branch pipe for cooperating with the first separation device, and a second branch pipe for cooperating with the second separation device. The analysis mechanism is installed on the main pipe. The first branch pipe is connected to the liquid inlet pipe of the first separation device, and the second branch pipe is connected to the liquid inlet pipe of the second separation device.

[0017] By adopting the above technical solution, the water-oil separation system employs two sets of separation devices. The first separation device and the second separation device are different in terms of the functional coating. The first separation device uses an oil-loving and water-repellent coating, while the second separation device uses a water-loving and oil-repellent coating. When the oil-water ratio in the oil-water mixture is different, coatings with different characteristics can be selected, enabling the oil-water mixture to undergo separation processes of different natures, thereby specifically improving the separation efficiency. The shunt system is a key component of this water-oil separation system, and it mainly consists of an analysis mechanism and a three-way shunt pipe. The three-way shunt pipe has a main pipe and two branch pipes. The analysis mechanism is installed on the main pipe to detect the water and oil content in the oil-water mixture, and the two branch pipes are respectively used to connect to the first separation device and the second separation device. When the oil-water mixture enters the three-way shunt pipe through the main pipe, the analysis mechanism detects its water and oil content. According to the detection results, the oil-water mixture is selectively directed to the first separation device or the second separation device. If the water content in the mixture is relatively high, it will be directed to the first separation device with an oil-loving and water-repellent coating; if the oil content is relatively high, it will be directed to the second separation device with a water-loving and oil-repellent coating.

[0018] Further, the regulating valve is an electric regulating valve, and the regulating valve is electrically connected to the analysis mechanism.

[0019] By adopting the above technical solution, the electric regulating valve can control the opening and closing or the opening degree of the valve through an electric actuator system. In this water-oil separation system, the electric regulating valve is used as a regulating valve to regulate the flow rate of the oil-water mixture entering the first separation device and the second separation device. The analysis mechanism detects the water and oil content in the oil-water mixture, accurately measures and displays the water-oil ratio in the mixture. The electric regulating valve is electrically connected to the analysis mechanism. The analysis mechanism analyzes the measured water-oil ratio data and selects one of the electric regulating valves for data transmission. The electric regulating valve controls the oil-water mixture to enter the corresponding separation device according to the received data.

[0020] Further, a water pump is connected to the liquid inlet pipe.

[0021] By adopting the above technical solution, the water pump is connected to the liquid inlet pipe to provide the power required for the oil-water mixture to enter the separation device. The water pump provides a stable flow rate and pressure, ensuring that the oil-water mixture smoothly enters the separation device, which helps to improve the conveying efficiency of the entire system and reduce the resistance and loss of the fluid in the pipeline.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. By coating the filter element with a functional coating having oil-loving and water-repellent or water-loving and oil-repellent properties, the separation process of the oil-water mixture is effectively accelerated. The increase in the external filter membrane of the filter element improves the surface area of the framework and the contact area between the oil-water mixture and the functional coating, enhancing the separation effect and improving the separation efficiency; 2. The combination of the circulation pipe and the circulation pump realizes the circulation treatment of the oil-water mixture, ensuring that the oil-water mixture can fully contact the functional coating on the filter element, and multiple filtration and separation. The liquid inlet pipe and the circulation pipe are both set along the tangential direction. Using the principle of fluid dynamics, a vortex is formed in the main tank, which helps the water droplets to coalesce and separate on the surface of the filter element, improve the separation efficiency, effectively avoid the problem of filter element clogging, and extend the service life of the filter element; 3. The diversion system selectively directs the oil-water mixture to the first or second separation device in real time according to the water-oil content of the oil-water mixture through the analysis mechanism and the three-way diversion pipe, so that the oil-water mixture undergoes separation processes of different properties, thereby improving the separation efficiency in a targeted manner. The electric control valve is electrically connected to the analysis mechanism to realize the function of automatically adjusting the flow rate of the oil-water mixture entering the separation device according to the water-oil ratio data, thereby enhancing the system's automatic control capability and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the continuous online water-oil separation device in Example 1 of the present application.

[0024] Figure 2 This is a partial structural diagram of the continuous online water-oil separation device in Example 1 of the present application (without frame).

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the tank body and filter element in Example 1 of the present application.

[0026] Figure 4 It is a schematic diagram of the overall structure of the filter element in Example 1 of the present application.

[0027] Figure 5 It is a schematic diagram of the overall structure of the continuous online water-oil separation device in Example 2 of the present application.

[0028] Explanation of the accompanying symbols: 1. Frame; 2. Tank body; 21. Main tank; 22. Upper connecting tank; 23. Lower connecting tank; 3. Filter element; 31. Top joint; 32. Skeleton; 321. Filter membrane; 322. Functional coating; 33. Bottom joint; 4. Liquid inlet pipe; 41. Water pump; 42. Regulating valve; 5. Oil outlet pipe; 6. Water outlet pipe; 7. Circulating pipe; 71. Circulating pump; 72. Circulating regulating valve; 8. Diversion system; 81. Analysis mechanism; 82. Three-way diverter pipe; 821. Main pipe; 822. First branch pipe; 823. Second branch pipe. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figures 1-5 , Example 1 and Example 2, further describe this application in detail.

[0030] Example 1 An embodiment of the present application discloses a continuous on-line water-oil separation device. Referring to Figure 1 and Figure 2 , the continuous on-line water-oil separation device includes a frame 1, a tank body 2 and a filter element 3. The tank body 2 is installed on the frame 1 in the vertical direction and is used for installing the filter element 3 inside it. The tank body 2 includes a main tank 21, an upper connecting tank 22 and a lower connecting tank 23 which are arranged coaxially from top to bottom. The upper connecting tank 22 and the lower connecting tank 23 are respectively fixedly connected to the upper and lower ends of the main tank 21 through flanges. In order to directly observe the oil-water mixture and the filter element 3 in the main tank 21, the main tank 21 in this embodiment is preferably made of stainless steel with high temperature and corrosion resistance.

[0031] A liquid inlet pipe 4 for introducing the oil-water mixture is fixedly connected to the side wall of the upper connecting tank 22, and a water pump 41 is connected to the liquid inlet pipe 4. An oil outlet pipe 5 communicating with the inside is fixedly connected to the top side of the upper connecting tank 22. A water outlet pipe 6 for discharging the filtered water is fixedly connected to the bottom side of the lower connecting tank 23. A circulating pipe 7 is fixedly connected to the side wall of the lower connecting tank 23, and a circulating pump 71 is connected to the circulating pipe 7. The oil-water mixture in the tank body 2 is led out to the original mixture through the circulating pipe 7 and undergoes the next cycle of filtration under the action of the circulating pump 71. The water in the oil-water mixture coalesces into large water droplets after demulsification by the filter element 3 and deposits at the bottom, which can be directly removed. Control valves 42 for controlling the on-off of the pipeline are installed on the liquid inlet pipe 4, the oil outlet pipe 5 and the water outlet pipe 6, and a circulating control valve 72 for controlling the on-off is installed on the circulating pipe 7.

[0032] Referring to Figure 3 and Figure 4 , the filter element 3 is located inside the tank body 2. The filter element 3 includes a top joint 31, a skeleton 32 and a bottom joint 33 which are coaxially arranged from top to bottom and integrally connected. The top joint 31 is located in the upper connecting tank 22 and is fixedly connected to the upper connecting tank 22, and the oil outlet pipe 5 communicates with the inside of the top joint 31. The lower joint is located in the lower connecting tank 23 and is fixedly connected to the lower connecting tank 23, and the water outlet pipe 6 communicates with the inside of the bottom joint 33.

[0033] A functional coating 322 is coated on the outer surface of the skeleton 32. The functional coating 322 in this embodiment includes an oil-loving and water-repellent coating and a water-loving and oil-repellent coating. When the oil-water ratio in the oil-water mixture is different, coatings with different characteristics can be selected, so that the oil-water mixture undergoes separation processes with different properties, thereby specifically improving the separation efficiency. Among them, the water-loving and oil-repellent coating can be the nano-modified high-hardness coating (model SJ-1109) of Zongyang Sanjin Pigment Co., Ltd., and the oil-loving and water-repellent coating can be the super oil-loving and super water-repellent coating with the authorization announcement number of CN109518462B by Southeast University.

[0034] To increase the contact area between the oil-water mixture and the functional coating 322 and improve the filtration efficiency, in this embodiment, a number of filter membranes 321 arranged in parallel are circumferentially provided along the length direction on the outer wall of the framework 32, and the functional coating 322 is coated on the outside of each filter membrane 321.

[0035] Referring to Figure 2 and Figure 3 , in this embodiment, the liquid inlet pipe 4 is perpendicular to the side wall of the upper connection tank 22 and is arranged along the tangent direction of the top joint 31. The circulation pipe 7 is perpendicular to the side wall of the lower connection tank 23 and is arranged along the tangent direction of the bottom joint 33.

[0036] The implementation principle of a continuous on-line oil-water separation device according to an embodiment of the present application is as follows: When the water content in the oil-water mixture is higher than the oil content, the filter element 3 coated with a lipophilic and hydrophobic coating is selected, the oil outlet pipe 5 is opened and the water outlet pipe 6 is closed, so that the oil substances in the oil-water mixture penetrate through the lipophilic and hydrophobic coating and then enter the inside of the filter element 3, and are then discharged through the oil outlet pipe 5. During this process, water droplets coalesce on the outer surface of the filter element 3, and the liquid inlet pipe 4 feeds liquid along the tangent direction of the filter element 3, thereby forming a swirling flow inside the tank body 2 to help the water droplets coalesced on the outer surface of the filter element 3 fall off, ensuring that the oil droplets can normally pass through the lipophilic and hydrophobic coating and enter the filter element 3. Since the discharge amount of the oil substances is less than the liquid inlet amount of the oil-water mixture, the excess liquid is led out by the circulation pipe 7 and collected into the original liquid for the next cycle of filtration.

[0037] When the water content in the oil-water mixture is lower than the oil content, the filter element 3 coated with a hydrophilic and lipophobic coating is selected, the water outlet pipe 6 is opened and the oil outlet pipe 5 is closed, so that the water in the oil-water mixture penetrates through the hydrophilic and lipophobic coating and then enters the inside of the filter element 3, and is then discharged through the water outlet pipe 6. During this process, oil droplets coalesce on the outer surface of the filter element 3, and the liquid inlet pipe 4 feeds liquid along the tangent direction of the filter element 3, thereby forming a swirling flow inside the tank body 2 to help the oil droplets coalesced on the outer surface of the filter element 3 fall off, ensuring that the water flow can normally pass through the hydrophilic and lipophobic coating and enter the filter element 3. Since the discharge amount of the water flow is less than the liquid inlet amount of the oil-water mixture, the excess liquid is led out by the circulation pipe 7 and collected into the original liquid for the next cycle of filtration.

[0038] The liquid inlet pipe 4 is installed on the upper connection tank 22, and the circulation pipe 7 is installed on the lower connection tank 23. When filtering oil, the regulating valve 42 of the liquid inlet pipe 4 and the circulation regulating valve 72 of the circulation pipe 7 are opened. When filtering water, the regulating valves 42 of the liquid inlet pipe 4 and the liquid outlet pipe are opened respectively, so that the water flow or oil substances can fully contact the filter element 3 and be effectively filtered.

[0039] Embodiment 2 The difference between this embodiment and Embodiment 1 is that this embodiment includes two separation devices and a flow splitting system 8 respectively used in cooperation with the two separation devices. The two separation devices are respectively defined as the first separation device and the second separation device. The functional coating 322 in the first separation device is a lipophilic and hydrophobic coating, and the functional coating 322 in the second separation device is a hydrophilic and lipophobic coating.

[0040] Referring to Figure 5 , the flow splitting system 8 includes an analysis mechanism 81 and a three-way flow splitter 82. The analysis mechanism 81 can detect the water and oil content in the oil-water mixture and display the detection result. The three-way flow splitter 82 has a main pipe 821, a first branch pipe 822 and a second branch pipe 823. The main pipe 821 is used to introduce the oil-water mixture, and the water pump 41 is installed on the main pipe 821. The first branch pipe 822 is in cooperation with the first separation device, and the second branch pipe 823 is in cooperation with the second separation device. The analysis mechanism 81 is installed on the main pipe 821. The first branch pipe 822 is connected to the liquid inlet pipe 4 of the first separation device, and the second branch pipe 823 is connected to the liquid inlet pipe 4 of the second separation device.

[0041] Regulating valves 42 for controlling the on-off of the pipeline are respectively installed on the first branch pipe 822 and the second branch pipe 823. In this embodiment, the regulating valves 42 on the first branch pipe 822 and the second branch pipe 823 are preferably electric regulating valves, and both regulating valves 42 are electrically connected to the analysis mechanism 81.

[0042] The implementation principle of a continuous online oil-water separation device according to an embodiment of the present application is as follows: The oil-water mixture is sent into the main pipe 821 of the three-way flow splitter 82 by the water pump 41. The analysis mechanism 81 detects the water and oil content in the oil-water mixture and displays the detection result. According to the detection result of the analysis mechanism 81, the electric regulating valve is selectively opened or closed to direct the oil-water mixture to the first separation device or the second separation device. When the water content in the mixture is relatively high, the oil-water mixture is directed to the first separation device (the filter element 3 is coated with a lipophilic and hydrophobic coating). When the oil content is relatively high, the oil-water mixture is directed to the second separation device (the filter element 3 is coated with a hydrophilic and lipophobic coating). The electric regulating valve is electrically connected to the analysis mechanism 81 to realize the function of automatically splitting the flow according to the water-oil ratio data.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A continuous on-line water-oil separation device, characterized in that: It includes a frame (1), a tank body (2) vertically arranged on the frame (1), and a filter element (3) arranged in the tank body (2). A functional coating (322) is coated on the outer surface of the filter element (3). A liquid inlet pipe (4) for introducing an oil-water mixture is connected to the side wall of the tank body (2). A water outlet pipe (6) for passing through the bottom of the tank body (2) and discharging the filtered water is arranged at the bottom end of the filter element (3). An oil outlet pipe (5) for passing through the top of the connecting cylinder and discharging the oil liquid is arranged at the upper end of the filter element (3). A regulating valve (42) for controlling the on-off of the pipeline is arranged on both the water outlet pipe (6) and the oil outlet pipe (5).

2. The continuous on-line water-oil separation device according to claim 1, wherein: The filter element (3) includes a top joint (31), a framework (32), and a bottom joint (33) arranged coaxially. The top joint (31) and the bottom joint (33) are respectively integrally connected to the upper and lower ends of the framework (32). A plurality of filter membranes (321) arranged side by side in a circumferential direction along the length direction are annularly arranged on the outer wall of the framework (32). The functional coating (322) is coated on the outside of each filter membrane (321).

3. The continuous on-line water-oil separation device according to claim 1, wherein: A circulating pipe (7) for discharging the oil-water mixture is connected to the side wall of the tank body (2). The circulating pipe (7) is connected with a circulating pump (71), and a circulating regulating valve (72) for controlling the on-off is installed on the circulating pipe (7).

4. The continuous on-line water-oil separation device according to claim 3, characterized in that: The tank body (2) includes a main tank (21), an upper connecting tank (22), and a lower connecting tank (23) which are coaxially arranged and respectively fixedly connected to the upper and lower ends of the main tank (21). The liquid inlet pipe (4) is connected to the upper connecting tank (22), and the circulating pipe (7) is connected to the lower connecting tank (23).

5. The continuous online water-oil separation device according to claim 4, characterized in that: The liquid inlet pipe (4) is arranged along the tangent direction of the upper connecting tank (22), and the circulating pipe (7) is arranged along the tangent direction of the lower connecting tank (23).

6. The continuous online water-oil separation device according to claim 1, characterized in that: The number of the oil-water separation devices is two. The two groups of oil-water separation devices are respectively defined as the first separation device and the second separation device. The functional coating (322) in the first separation device is an oil-loving and water-repellent coating, and the functional coating (322) in the second separation device is a water-loving and oil-repellent coating. It further includes a shunt system (8) for cooperating with the two groups of oil-water separation devices. The shunt system (8) includes an analysis mechanism (81) for detecting the water and oil content in the oil-water mixture and a three-way shunt pipe (82). The three-way shunt pipe (82) has a main pipe (821) for introducing the oil-water mixture, a first branch pipe (822) for cooperating with the first separation device, and a second branch pipe (823) for cooperating with the second separation device. The analysis mechanism (81) is installed on the main pipe (821). The first branch pipe (822) is connected to the liquid inlet pipe (4) of the first separation device, and the second branch pipe (823) is connected to the liquid inlet pipe (4) of the second separation device.

7. The continuous online water-oil separation device according to claim 6, characterized in that: The regulating valve (42) is an electric regulating valve, and the regulating valve (42) is electrically connected to the analysis mechanism (81).

8. The continuous online water-oil separation device according to claim 1, characterized in that: The liquid inlet pipe (4) is connected with a water pump (41).

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