Continuous online water-oil separation device

Abstract

The utility model 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] This application relates to the technical field of water-oil separation, and in particular to a continuous online water-oil separation device. Background Technology

[0002] Water is inevitably produced during the oilfield extraction process. In order to prevent water from affecting the quality of crude oil, it is necessary to remove the water in a timely manner.

[0003] In related technologies, water is usually extracted directly from the oil field, filtered, and then discharged.

[0004] Regarding the aforementioned technologies, conventional water-oil separation is inefficient and not thorough enough, so some crude oil remains in the discharged water, causing environmental impact. Utility Model Content

[0005] In order to thoroughly separate water and oil and improve the efficiency of water-oil separation, this application provides a continuous online water-oil separation device.

[0006] The continuous online water-oil separation device provided in this application adopts the following technical solution:

[0007] A continuous online water-oil separation device includes a frame, a tank disposed vertically in the frame, and a filter element disposed in the tank, wherein the outer surface of the filter element is coated with a functional coating.

[0008] The tank body is connected to an inlet pipe for introducing an oil-water mixture on its side wall. The filter element is provided with a water outlet pipe at its bottom end for passing through the bottom of the tank body and discharging filtered water. The filter element is provided with an oil outlet pipe at its top end for passing through the top of the connecting cylinder and discharging oil. Both the water outlet pipe and the oil outlet pipe are provided with regulating valves for controlling the opening and closing of the pipeline.

[0009] By adopting the above technical solution, the frame provides support for the tank and allows the tank to be set vertically, with the filter element located inside the tank. The outer surface of the filter element is coated with a functional coating, which has oleophilic-hydrophobic or hydrophilic-oleophobic properties, effectively helping to separate water and oil in the oil-water mixture, accelerating the water-oil separation process, and improving separation efficiency. An inlet pipe is connected to the side wall of the tank for introducing the oil-water mixture. A water outlet pipe is located at the bottom of the filter element, passing through the bottom of the tank, for discharging the filtered water. An oil outlet pipe is located at the top of the filter element, passing through a connecting cylinder, for discharging the separated oil. Both the water outlet pipe and the oil outlet pipe are equipped with regulating valves to control the flow of the pipelines. The separation device of this application operates continuously online, can continuously process oil-water mixtures, improves separation efficiency, significantly reduces the amount of residual crude oil in the discharged water, and helps to reduce environmental pollution and protect the ecological environment.

[0010] Furthermore, the filter element includes a top connector, a frame, and a bottom connector arranged coaxially. The top connector and the bottom connector are integrally connected to the upper and lower ends of the frame, respectively. The outer wall of the frame is circumferentially provided with a plurality of filter membranes arranged in parallel along the length direction. The functional coating is applied to the outside of each of the filter membranes.

[0011] By adopting the above technical solution, the filter element comprises three main parts: a top connector, a frame, and a bottom connector. These three parts are coaxially arranged, with the top and bottom connectors integrally connected to the upper and lower ends of the frame, ensuring the structural stability and integrity of the filter element and facilitating its connection and fixation to the tank and other components. Several parallel filter membranes are arranged circumferentially along the length of the outer wall of the frame. These filter membranes increase the surface area of ​​the frame, providing more adhesion points for the functional coating and increasing the contact area between the oil-water mixture and the functional coating, thereby improving the efficiency of water-oil separation.

[0012] Furthermore, the tank body is connected to a circulation pipe on its side wall for discharging an oil-water mixture. The circulation pipe is connected to a circulation pump and is equipped with a circulation regulating valve for controlling the on / off state.

[0013] By adopting the above technical solution, the tank, as the main component of the continuous online water-oil separation device, provides installation space for the filter element and, through a circulation pipe connected to its side wall, enables the circulation of the oil-water mixture. The circulation pipe allows the oil-water mixture to undergo multiple filtrations and separations within the device, thereby further improving separation efficiency. One end of the circulation pipe is connected to the side wall of the tank to discharge the oil-water mixture, while the other end is connected to a circulation pump. The pump provides power to create a circulating flow of the oil-water mixture within the device, ensuring that the mixture fully contacts the functional coating on the filter element, thus accelerating the water-oil separation process. A circulation regulating valve is installed on the circulation pipe to control its opening and closing. By adjusting the opening 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 operating conditions.

[0014] Furthermore, the tank body includes a main tank and an upper connecting tank and a lower connecting tank coaxially arranged and respectively fixedly connected to the upper and lower ends of the main tank. The liquid inlet pipe is connected to the upper connecting tank, and the circulation pipe is connected to the lower connecting tank.

[0015] By adopting the above technical solution, the tank body comprises three parts: a main tank, an upper connecting tank, and a lower connecting tank. The main tank, typically made of glass, is cylindrical and houses the filter element. It forms the main body of the tank, ensuring smooth installation and proper functioning of the filter element. Due to its special material, the main tank is not easily drilled for connecting other pipelines. The upper and lower connecting tanks are coaxially arranged and fixedly connected to the upper and lower ends of the main tank, respectively. This allows the tank body to connect to other components such as inlet pipes and circulation pipes, ensuring the stability and reliability of the connections.

[0016] Furthermore, the inlet pipe is arranged along the tangential direction of the upper connecting tank, and the circulation pipe is arranged along the tangential direction of the lower connecting tank.

[0017] By adopting the above technical solution, both the inlet pipe and the circulation pipe are set along the tangential direction of their respective connecting cylinders (upper connecting tank and lower connecting tank). When the oil-water mixture enters the upper connecting tank tangentially through the inlet pipe, a swirling flow is formed inside the main tank. This swirling flow helps water droplets coalesce and separate on the filter element surface. Due to centrifugal force, the water droplets are thrown towards the outer wall of the filter element and flow downwards along the filter element surface before being discharged. By utilizing fluid dynamics principles, the flow state of the oil-water mixture inside the device is optimized, thereby improving separation efficiency. The tangential setting of the inlet pipe and the resulting swirling flow help remove water droplets coalescing on the filter element surface in a timely manner, effectively avoiding filter element clogging and extending the filter element's service life.

[0018] Furthermore, there are two water-oil separation devices, and the two sets of water-oil separation devices are 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.

[0019] It also includes a diversion system for use with two sets of water-oil separation devices. The diversion system includes an analytical device for detecting the water-oil content in the oil-water mixture and a three-way diversion pipe. The three-way diversion pipe has a main pipe for introducing the oil-water mixture, a first branch pipe for use with the first separation device, and a second branch pipe for use with the second separation device. The analytical device is mounted 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.

[0020] By adopting the above technical solution, the water-oil separation system employs two sets of separation devices. The first and second separation devices differ in their functional coatings: the first separation device uses an oleophilic-hydrophobic coating, while the second separation device uses a hydrophilic-oleophobic coating. When the oil-water ratio in the oil-water mixture is different, coatings with different properties can be selected, allowing the oil-water mixture to undergo separation processes with different properties, thereby specifically improving the separation efficiency. The diversion system is a key component of this water-oil separation system, mainly composed of an analytical mechanism and a three-way diversion pipe. The three-way diversion pipe has a main pipe and two branch pipes. The analytical mechanism is installed on the main pipe to detect the water and oil content in the oil-water mixture. The two branch pipes are used to connect to the first and second separation devices, respectively. When the oil-water mixture enters the three-way diversion pipe through the main pipe, the analytical mechanism detects its water and oil content. Based on the detection results, the oil-water mixture is selectively guided to either the first or second separation device. If the water content in the mixture is high, it will be guided to the first separation device with an oleophilic-hydrophobic coating; if the oil content is high, it will be guided to the second separation device with a hydrophilic-oleophobic coating.

[0021] Furthermore, the regulating valve is an electrically operated regulating valve, and the regulating valve is electrically connected to the analysis mechanism.

[0022] By adopting the above technical solution, the electric regulating valve can control the on / off state or opening degree of the valve through an electric actuator system. In this oil-water 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 and second separation devices. The analysis unit detects the oil-water content in the mixture, accurately measuring and displaying the water-oil ratio. The electric regulating valve is electrically connected to the analysis unit. The analysis unit analyzes the measured water-oil ratio data and selects one of the electric regulating valves for data transmission. Based on the received data, the electric regulating valve controls the oil-water mixture to enter the corresponding separation device.

[0023] Furthermore, the inlet pipe is connected to a water pump.

[0024] By adopting the above technical solution, the water pump is connected to the 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 enters the separation device smoothly, which helps to improve the overall system's conveying efficiency and reduce fluid resistance and loss in the pipeline.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The filter element is coated with a functional coating that has oleophilic and hydrophobic or hydrophilic and oleophobic properties, which effectively accelerates the separation process of oil-water mixtures. The increase in the external filter membrane of the filter element increases the surface area of ​​the skeleton and the contact area between the oil-water mixture and the functional coating, thereby enhancing the separation effect and improving the separation efficiency.

[0027] 2. The combined use of the circulation pipe and circulation pump enables the circulation of oil-water mixtures, ensuring that the oil-water mixture can fully contact the functional coating on the filter element for multiple filtrations and separations. Both the inlet pipe and the circulation pipe are set along the tangential direction, utilizing the principle of fluid dynamics to form a vortex in the main tank, which helps the water droplets to coalesce and separate on the surface of the filter element, improving separation efficiency and effectively avoiding filter element clogging, thus extending the service life of the filter element.

[0028] 3. The diversion system, through the analysis unit and the three-way diversion pipe, selectively guides the oil-water mixture to the first or second separation device in real time according to the water-oil content, so that the oil-water mixture undergoes a separation process of different properties, thereby improving the separation efficiency in a targeted manner. The electric regulating valve is electrically connected to the analysis unit, realizing the function of automatically adjusting the flow rate of the oil-water mixture entering the separation device according to the water-oil ratio data, enhancing the system's automation control capability and flexibility. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the continuous online water-oil separation device in Embodiment 1 of this application.

[0030] Figure 2 This is a partial structural schematic diagram (without frame) of the continuous online water-oil separation device in Embodiment 1 of this application.

[0031] Figure 3 This is a cross-sectional structural diagram of the tank and filter element in Embodiment 1 of this application.

[0032] Figure 4 This is a schematic diagram of the overall structure of the filter element in Embodiment 1 of this application.

[0033] Figure 5 This is a schematic diagram of the overall structure of the continuous online water-oil separation device in Embodiment 2 of this application.

[0034] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Tank body; 21. Main tank; 22. Upper connecting tank; 23. Lower connecting tank; 3. Filter element; 31. Top connector; 32. Skeleton; 321. Filter membrane; 322. Functional coating; 33. Bottom connector; 4. Inlet pipe; 41. Water pump; 42. Regulating valve; 5. Oil outlet pipe; 6. Water outlet pipe; 7. Circulation pipe; 71. Circulation pump; 72. Circulation regulating valve; 8. Diversion system; 81. Analytical unit; 82. T-junction diversion pipe; 821. Main pipe; 822. First branch pipe; 823. Second branch pipe. Detailed Implementation

[0035] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1-5 Examples 1 and 2 will be used to further describe this application in detail.

[0036] Example 1

[0037] This application discloses a continuous online water-oil separation device. (Refer to...) Figure 1 and Figure 2 The continuous online oil-water separator includes a frame 1, a tank 2, and a filter element 3. The tank 2 is vertically mounted on the frame 1 and houses the filter element 3. The tank 2 includes a main tank 21, an upper connecting tank 22, and a lower connecting tank 23 arranged coaxially from top to bottom. The upper connecting tank 22 and the lower connecting tank 23 are fixedly connected to the upper and lower ends of the main tank 21 via flanges. To allow direct observation of the oil-water mixture and filter element 3 within the main tank 21, the main tank 21 in this embodiment is preferably made of high-temperature and corrosion-resistant stainless steel.

[0038] An inlet pipe 4 for introducing an 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 inlet pipe 4. An oil outlet pipe 5 communicating with the interior is fixedly connected to the top side of the upper connecting tank 22. A water outlet pipe 6 for discharging filtered water is fixedly connected to the bottom side of the lower connecting tank 23. A circulation pipe 7 is fixedly connected to the side wall of the lower connecting tank 23, and a circulation pump 71 is connected to the circulation pipe 7. The oil-water mixture in the tank 2 is discharged into the original mixture through the circulation pipe 7, and then undergoes further circulation filtration under the action of the circulation pump 71. The water in the oil-water mixture is demulsified by the filter element 3 and coalesces into large water droplets, which are deposited at the bottom and can be directly removed. The inlet pipe 4, the oil outlet pipe 5, and the water outlet pipe 6 are all equipped with regulating valves 42 to control the on / off of the pipelines, and the circulation pipe 7 is equipped with a circulation regulating valve 72 to control the on / off of the circulation.

[0039] Reference Figure 3 and Figure 4 The filter element 3 is located inside the tank 2. The filter element 3 includes a top connector 31, a frame 32, and a bottom connector 33, which are coaxially arranged and integrally connected from top to bottom. The top connector 31 is located inside the upper connecting tank 22 and is fixedly connected to the upper connecting tank 22. The oil outlet pipe 5 is interconnected with the interior of the top connector 31. The bottom connector is located inside the lower connecting tank 23 and is fixedly connected to the lower connecting tank 23. The water outlet pipe 6 is interconnected with the interior of the bottom connector 33.

[0040] The outer surface of the skeleton 32 is coated with a functional coating 322. In this embodiment, the functional coating 322 includes an oleophilic-hydrophobic coating and a hydrophilic-oleophobic coating. When the oil-water ratio in the oil-water mixture is different, coatings with different properties can be selected so that the oil-water mixture undergoes a separation process with different properties, thereby improving the separation efficiency in a targeted manner. Among them, the hydrophilic-oleophobic coating can be the nano-modified high-hardness coating (model SJ-1109) of Zongyang Sanjin Pigment Co., Ltd., and the oleophilic-hydrophobic coating can be the superoleophilic and superhydrophobic coating authorized by Southeast University with announcement number CN109518462B.

[0041] In order to increase the contact area between the oil-water mixture and the functional coating 322 and improve the filtration efficiency, in this embodiment, the outer wall of the skeleton 32 is provided with a plurality of filter membranes 321 arranged in parallel along the length direction, and the functional coating 322 is coated on the outside of each filter membrane 321.

[0042] Reference Figure 2 and Figure 3 In this embodiment, the inlet pipe 4 is perpendicular to the side wall of the upper connecting tank 22 and arranged along the tangent direction of the top connector 31. The circulation pipe 7 is perpendicular to the side wall of the lower connecting tank 23 and arranged along the tangent direction of the bottom connector 33.

[0043] The implementation principle of a continuous online water-oil separation device according to an embodiment of this application is as follows: When the water content in the oil-water mixture is higher than the oil content, a filter element 3 coated with an oleophilic-hydrophobic coating is selected. The oil outlet pipe 5 is opened and the water outlet pipe 6 is closed, allowing the oily substances in the oil-water mixture to pass through the oleophilic-hydrophobic coating and enter the interior of the filter element 3, and then be discharged through the oil outlet pipe 5. During this process, water droplets gather on the outer surface of the filter element 3, and the liquid inlet pipe 4 introduces liquid along the tangential direction of the filter element 3, thereby forming a vortex inside the tank 2, which helps the water droplets gathered on the outer surface of the filter element 3 to fall off, ensuring that the oil droplets can pass through the oleophilic-hydrophobic coating normally and enter the filter element 3. Since the amount of oily substances discharged is less than the amount of oil-water mixture entering, the excess liquid is discharged through the circulation pipe 7 and collected in the original liquid for the next cycle of filtration.

[0044] When the water content in the oil-water mixture is lower than the oil content, a filter element 3 coated with a hydrophilic-oleophobic coating is selected. The water outlet pipe 6 is opened and the oil outlet pipe 5 is closed, allowing water from the oil-water mixture to pass through the hydrophilic-oleophobic coating and enter the interior of the filter element 3, before being discharged through the water outlet pipe 6. During this process, oil droplets accumulate on the outer surface of the filter element 3. Liquid is introduced through the inlet pipe 4 along the tangential direction of the filter element 3, thereby creating a swirling flow inside the tank 2. This helps the oil droplets accumulated on the outer surface of the filter element 3 to fall off, ensuring that the water flow can pass normally through the hydrophilic-oleophobic coating and enter the filter element 3. Since the water discharge rate is less than the oil-water mixture inflow rate, the excess liquid is discharged through the circulation pipe 7 and collected in the original solution for the next cycle of filtration.

[0045] The inlet pipe 4 is installed in the upper connecting tank 22, and the circulation pipe 7 is installed in the lower connecting tank 23. When filtering oil, the regulating valve 42 of the 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 inlet pipe 4 and the outlet pipe are opened respectively, so that the water or oily substances can fully contact the filter element 3 and effectively filter.

[0046] Example 2

[0047] The difference between this embodiment and Embodiment 1 is that this embodiment includes two sets of separation devices and a diversion system 8 for cooperating with the two sets of separation devices. The two sets of separation devices are defined as the first separation device and the second separation device, respectively. The functional coating 322 in the first separation device is an oleophilic and hydrophobic coating, and the functional coating 322 in the second separation device is a hydrophilic and oleophobic coating.

[0048] Reference Figure 5 The diversion system 8 includes an analysis unit 81 and a three-way diversion pipe 82. The analysis unit 81 can detect the oil-water content in the oil-water mixture and display the detection results. The three-way diversion pipe 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 a water pump 41 is installed on the main pipe 821. The first branch pipe 822 cooperates with a first separation device, and the second branch pipe 823 cooperates with a second separation device. The analysis unit 81 is installed on the main pipe 821, the first branch pipe 822 is connected to the inlet pipe 4 of the first separation device, and the second branch pipe 823 is connected to the inlet pipe 4 of the second separation device.

[0049] The first branch pipe 822 and the second branch pipe 823 are respectively equipped with regulating valves 42 for controlling the opening and closing of the pipeline. 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 unit 81.

[0050] The implementation principle of a continuous online water-oil separation device according to an embodiment of this application is as follows: An oil-water mixture is pumped by a water pump 41 into the main pipe 821 of a three-way diversion pipe 82. An analysis unit 81 detects the water and oil content in the mixture and displays the results. Based on the detection results of the analysis unit 81, an electric regulating valve is selectively opened or closed to guide the oil-water mixture to a first separation device or a second separation device. When the water content in the mixture is high, the oil-water mixture is guided to the first separation device (filter element 3 is coated with an oleophilic-hydrophobic coating); when the oil content is high, the oil-water mixture is guided to the second separation device (filter element 3 is coated with a hydrophilic-oleophobic coating). The electric regulating valve is electrically connected to the analysis unit 81, realizing the function of automatic diversion based on the water-oil ratio data.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A continuous online water-oil separation device, characterized in that: It includes a frame (1), a tank (2) arranged vertically in the frame (1), and a filter element (3) disposed in the tank (2), wherein the outer surface of the filter element (3) is coated with a functional coating (322); The tank (2) is connected to an inlet pipe (4) for introducing an oil-water mixture on its side wall. The filter element (3) is provided with an outlet pipe (6) at its bottom end for passing through the bottom of the tank (2) and discharging filtered water. The filter element (3) is provided with an oil outlet pipe (5) at its upper end for passing through the top of the connecting cylinder and discharging oil. Both the outlet pipe (6) and the oil outlet pipe (5) are provided with regulating valves (42) for controlling the opening and closing of the pipeline.

2. The continuous online water-oil separation device according to claim 1, characterized in that: The filter element (3) includes a top connector (31), a frame (32), and a bottom connector (33) arranged coaxially. The top connector (31) and the bottom connector (33) are integrally connected to the upper and lower ends of the frame (32). The outer wall of the frame (32) is circumferentially provided with a plurality of filter membranes (321) arranged in parallel along the length direction. The functional coating (322) is coated on the outside of each filter membrane (321).

3. The continuous online water-oil separation device according to claim 1, characterized in that: The tank (2) is connected to a circulation pipe (7) for discharging an oil-water mixture on its side wall. The circulation pipe (7) is connected to a circulation pump (71), and the circulation pipe (7) is equipped with a circulation regulating valve (72) for controlling the on / off state.

4. The continuous online water-oil separation device according to claim 3, characterized in that: The tank body (2) includes a main tank (21) and an upper connecting tank (22) and a lower connecting tank (23) coaxially arranged and fixedly connected to the upper and lower ends of the main tank (21), respectively. The liquid inlet pipe (4) is connected to the upper connecting tank (22), and the circulation 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 inlet pipe (4) is arranged along the tangential direction of the upper connecting tank (22), and the circulation pipe (7) is arranged along the tangential 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 water-oil separation devices is two, and the two sets of water-oil separation devices are defined as the first separation device and the second separation device. The functional coating (322) in the first separation device is an oleophilic and hydrophobic coating, and the functional coating (322) in the second separation device is a hydrophilic and oleophobic coating. It also includes a diversion system (8) for use with two sets of water-oil separation devices. The diversion system (8) includes an analysis unit (81) for detecting the water-oil content in the oil-water mixture and a three-way diversion pipe (82). The three-way diversion pipe (82) has a main pipe (821) for introducing the oil-water mixture, a first branch pipe (822) for use with the first separation device, and a second branch pipe (823) for use with the second separation device. The analysis unit (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 inlet pipe (4) is connected to a water pump (41).

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