Buffer tank oil-water separation device
By combining a buffer tank oil-water separation device with an electronic density meter and solenoid valve control, efficient oil-water separation is achieved, solving the problems of high energy consumption and environmental pollution in existing technologies and reducing separation costs.
Patent Information
- Application Number
- CN202520413176.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-10
AI Technical Summary
Existing oil-water separation technologies suffer from high energy consumption, high costs, and environmental pollution, especially the high costs and flue gas emissions caused by using boilers during crude oil heating.
An oil-water separation device using buffer tanks is employed. By combining a first buffer tank and a second buffer tank, along with electronic density meter and solenoid valve control, primary separation and secondary filtration of oil and water are achieved. Further purification is carried out using micropores in the water filter and an oil filter box, thereby reducing energy consumption and costs.
It achieves good oil-water separation, reduces energy consumption and separation costs, and also reduces environmental pollution. It is suitable for oil-water separation in crude oil processing.
Smart Images
Figure CN223930754U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil-water separation technology, and in particular to an oil-water separation device for a buffer tank. Background Technology
[0002] Crude oil is an oil-water mixture. To obtain pure crude oil, the water needs to be separated. Currently, when using chemical agents for oil-water separation, the crude oil needs to be heated to a preset temperature. A common method for heating crude oil is to inject steam into it. However, producing steam requires building a boiler, and boiler operation consumes coal or natural gas, resulting in high crude oil separation costs. In addition, boilers also emit flue gas that pollutes the environment during operation. Furthermore, some wastewater contains high levels of oil and cannot be directly discharged; it needs to be filtered to reduce the oil content to a certain level before it can be discharged. For these situations, oil-water separation equipment is generally used. Some separation equipment requires oil-water separators, centrifugal separators, etc., which requires more energy, uses more equipment, and results in high separation costs. Utility Model Content
[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a buffer tank oil-water separation device that solves problems such as difficulty in oil-water separation, high energy consumption during separation, and high separation costs.
[0004] According to this utility model, an oil-water separation device for a buffer tank includes a first buffer tank, a second buffer tank, and an oil removal tank. A water inlet pipe is provided on one side wall near the top of the first buffer tank. A buffer outlet assembly is installed at the end of the water inlet pipe that is inserted into the first buffer tank. An oil outlet pipe, lower than the water inlet pipe, is provided on the other side wall near the top of the first buffer tank. The oil outlet end of the oil outlet pipe is connected to the side wall near the top of the second buffer tank. A first drain pipe is provided at the bottom of the first buffer tank, and a first solenoid valve is installed inside the first drain pipe. The water outlet end of the first drain pipe is connected to the side wall near the top of the oil removal tank. A removable oil filter box is provided inside the oil removal tank. The second buffer tank is equipped with a second drain pipe. The upper part of the second buffer tank is equipped with a first oil storage chamber and the lower part is equipped with a second oil storage chamber. Multiple water filter pipes are connected between the bottom of the first oil storage chamber and the top of the second oil storage chamber. The side walls of the water filter pipes are evenly distributed with water filter micropores. A third drain pipe is provided on the side wall of the second buffer tank near the bottom between the first oil storage chamber and the second oil storage chamber. A second oil drain pipe is provided on the bottom of the second buffer tank and a second solenoid valve is provided in the second oil drain pipe. A first electron densitometer and a second electron densitometer are respectively provided at the middle position of the lower half and the middle position of the upper half of the first buffer tank. A third electron densitometer is provided on the side wall of the second buffer tank below the position of the oil drain pipe.
[0005] In some embodiments of this utility model, the buffer water outlet assembly includes a water collection box, a fixed lower drain pipe, and a floating water pipe. The water collection box is fitted onto the end of the water inlet pipe, and the fixed lower drain pipe is connected to the bottom of the water collection box. The floating water pipe is fitted onto the fixed lower drain pipe, and the floating water pipe has two collars on its upper half. A limit ring is fitted on the top side wall of the floating water pipe, and a float is fitted near the bottom of the floating water pipe. The floating water pipe has multiple drainage holes on its bottom side wall.
[0006] In some other embodiments of this utility model, the oil filter box has an opening at the top and a drainage hole at the bottom. The oil filter box is provided with a polytetrafluoroethylene filter membrane gauze layer and a wire mesh layer from bottom to top.
[0007] In some other embodiments of this utility model, the end of the first drain pipe is connected to an extension pipe screwed onto it inside the oil removal tank, and the water outlet of the extension pipe is located above the oil filter box.
[0008] In some other embodiments of this utility model, the diameter of the water filtration micropores is 20-80 nm.
[0009] In some other embodiments of this utility model, the oil drain pipe is a square pipe, and the oil drain pipe gradually decreases in height from the oil inlet end to the oil outlet end.
[0010] In this invention, a first buffer tank is used to statically separate oil and water in sewage or crude oil. Some water will settle to the bottom. When the water reaches a certain amount, it will be discharged to remove the water. When a certain amount of water is discharged from the buffer tank, the oil enters the second buffer tank through the oil drain pipe for seepage treatment, resulting in more concentrated oil being discharged. The water filtration effect is good. The water discharged from the first buffer tank is filtered by an oil removal tank to obtain water with an oil content that meets the discharge standards and can be directly discharged. Attached Figure Description
[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0012] Figure 1 This is a schematic diagram of the structure of a buffer tank oil-water separation device proposed in this utility model.
[0013] Figure 2 This is a cross-sectional structural diagram of a buffer tank oil-water separation device proposed in this utility model.
[0014] In the diagram, 1. First buffer tank; 11. Water inlet pipe; 12. Oil drain pipe; 13. First drain pipe; 131. First solenoid valve; 132. Extension pipe; 14. Second electronic densitometer; 15. First electronic densitometer; 2. Oil removal tank; 21. Second drain pipe; 3. Second buffer tank; 31. Second oil drain pipe; 311. Second solenoid valve; 32. Third electronic densitometer; 33. First oil storage chamber; 34. Second oil storage chamber; 35. Water filter pipe; 36. Third drain pipe; 4. Water collection box; 41. Fixed lower drain pipe; 42. Floating water pipe; 421. Multi-ring drain hole; 43. Float block; 5. Oil filter box; 51. Wire mesh layer; 52. Gauze layer; 53. Polytetrafluoroethylene filter membrane layer. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0016] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0017] Reference Figure 1-2An oil-water separation device for a buffer tank includes a first buffer tank 1, a second buffer tank 3, and an oil removal tank 2. The first buffer tank 1 has a water inlet pipe 11 on one side wall near the top. A buffer outlet assembly is installed at the end of the water inlet pipe 11 that is inserted into the first buffer tank 1. An oil drain pipe 12, lower than the water inlet pipe 11, is located on the other side wall of the first buffer tank 1 near the top. The oil outlet of the oil drain pipe 12 is connected to the side wall of the second buffer tank 3 near the top. The first buffer tank 1 has a first drain pipe 13 at its bottom, and a first solenoid valve 131 is installed inside the first drain pipe 13. The water outlet of the first drain pipe 13 is connected to the side wall of the oil removal tank 2 near the top. The oil removal tank 2 has a removable oil filter box 5 inside, and a second drain pipe 2 is located at its bottom. 1. The second buffer tank 3 has a first oil storage chamber 33 in the upper part and a second oil storage chamber 34 in the lower part. Multiple water filter pipes 35 are connected between the bottom of the first oil storage chamber 33 and the top of the second oil storage chamber 34. Water filter micropores are evenly distributed on the side wall of the water filter pipes 35. A third drain pipe 36 is provided on the side wall of the second buffer tank 3 near the bottom between the first oil storage chamber 33 and the second oil storage chamber 34. A second oil drain pipe 31 is provided at the bottom of the second buffer tank and a second solenoid valve 311 is provided inside the second oil drain pipe 31. A first electronic densitometer 15 and a second electronic densitometer 14 are respectively provided at the middle position of the lower half and the middle position of the upper half of the first buffer tank 1. A third electronic densitometer 32 is provided on the side wall of the second buffer tank 3 below the position of the oil drain pipe 12.
[0018] When wastewater or crude oil containing water is discharged from the inlet pipe 11 (which has already been filtered for impurities), the discharged liquid settles in the first buffer tank 1, with water settling to the bottom. When the accumulated liquid level exceeds the oil drain pipe 12, oil is discharged from the oil drain pipe 12 and flows into the second buffer tank 3. The water content in the liquid partially overflows the second electronic density meter 14. At this point, the first solenoid valve 131 is activated to slowly drain the water. When the water level drops to the position of the first electronic density meter 15, the first solenoid valve 131 is closed to stop the drainage. The process of discharging liquid continues to accumulate water and separate oil and water. This achieves primary oil-water separation.
[0019] When the separated water is discharged into the oil removal tank 2, since the separated water still contains oil, it needs to be filtered out by the oil filter box 5 before the water can be discharged directly. The oil separated in the primary stage still contains some water, which enters the first oil storage chamber 33 and accumulates, then sinks to the second oil storage chamber 34 (small capacity). The oil seeps water out through the water filter pipe 35. When the oil accumulates to the position of the third electronic density meter 32, the oil will be slowly discharged by opening the second solenoid valve 311. If it takes 10 minutes to empty the first oil storage chamber 33, the oil discharge time is set to 10 minutes. Then, the second solenoid valve 311 is closed. Each time the third electronic density meter 32 detects that the oil has reached this position, the oil is discharged once. In this way, more oil can be filtered to remove water a second time, resulting in a more concentrated oil.
[0020] The first electronic densitometer 15, the second electronic densitometer 14, and the third electronic densitometer 32 are all non-stick probes. They are made of materials with oleophobic properties, such as Teflon.
[0021] The buffer water outlet assembly includes a water collection box 4, a fixed lower drain pipe 41, and a floating water pipe 42. The water collection box 4 is fitted onto the end of the water inlet pipe 11. The bottom of the water collection box 4 is connected to the fixed lower drain pipe 41. The floating water pipe 42 is fitted onto the fixed lower drain pipe 41. The upper half of the floating water pipe 42 is fitted with two collars 44. The top side wall of the floating water pipe 42 is fitted with a limit ring. The floating water pipe 42 is fitted with a float block 43 near the bottom end. The floating water pipe 42 has multiple drainage holes 421 on the bottom side wall.
[0022] When liquid is discharged from the inlet pipe 11, direct discharge would cause an impact, resulting in the remixing of the separated oil and water. To mitigate this, the liquid is directed to flow through a fixed drain pipe 41 and a floating pipe 42, eliminating the impact. The liquid then exits through multiple drain holes 421 without disrupting the stratification. The floating pipe 42 can adjust the position of the drain holes 421 to prevent liquid dripping. Drainage and oil discharge are not performed unless the liquid level in the first buffer tank 1 is low, otherwise dripping could disrupt the oil-water layer.
[0023] The oil filter box 5 is a box with an opening at the top and a drainage hole at the bottom. The oil filter box 5 contains, from bottom to top, a polytetrafluoroethylene filter membrane layer 53, a gauze layer 52 and a wire mesh layer 51.
[0024] Filter out the residual oil, and replace or clean the oil filter box 5 periodically. Since it contains very little oil, the replacement time will not be too frequent.
[0025] An extension pipe 132 is screwed onto the end of the first drain pipe 13 inside the oil removal tank 2. The water outlet of the extension pipe 132 is located above the oil filter box 5. This design facilitates the removal of the oil filter box 5, prevents the first drain pipe 13 from being extended too far into the interior, and also prevents water from easily draining above the oil filter box 5. The detachable extension pipe 132 allows for removal during replacement and reconnection after replacement.
[0026] The diameter of the filter micropores is 20-80 nm. It can effectively filter water, but water is difficult to pass through.
[0027] The oil drain pipe 12 is a square pipe, and the oil drain pipe 12 gradually decreases in height from the oil inlet end to the oil outlet end. This prevents condensation on the oil drain pipe 12, and the tilt facilitates the downward flow of oil.
[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A buffer tank oil-water separation device, characterized in that: The system includes a first buffer tank (1), a second buffer tank (3), and an oil removal tank (2). The first buffer tank (1) has a water inlet pipe (11) on one side wall near the top. A buffer outlet assembly is installed at the end of the water inlet pipe (11) inserted into the first buffer tank (1). The first buffer tank (1) has an oil drain pipe (12) on the other side wall near the top, lower than the water inlet pipe (11). The oil outlet end of the oil drain pipe (12) is connected to the side wall near the top of the second buffer tank (3). The first buffer tank (1) has a first drain pipe (13) at its bottom, and a first solenoid valve (131) is installed inside the first drain pipe (13). The water outlet end of the first drain pipe (13) is connected to the side wall near the top of the oil removal tank (2). The oil removal tank (2) has a removable oil filter box (5). The oil removal tank (2) has a second drain pipe (21) at its bottom. The second buffer tank (3) has a first oil storage chamber (33) in the upper part and a second oil storage chamber (34) in the lower part. Multiple water filter pipes (35) are connected between the bottom of the first oil storage chamber (33) and the top of the second oil storage chamber (34). Water filter micropores are evenly distributed on the side wall of the water filter pipe (35). A third drain pipe (36) is provided on the side wall of the second buffer tank (3) located near the bottom between the first oil storage chamber (33) and the second oil storage chamber (34). A second oil drain pipe (31) is provided at the bottom of the second buffer tank and a second solenoid valve (311) is provided inside the second oil drain pipe (31). A first electronic densitometer (15) and a second electronic densitometer (14) are provided at the middle position of the lower half and the middle position of the upper half of the first buffer tank (1), respectively. A third electronic densitometer (32) is provided on the side wall of the second buffer tank (3) at a position lower than the oil drain pipe (12).
2. The buffer tank oil-water separator according to claim 1, characterized in that: The buffer water outlet assembly includes a water collection box (4), a fixed lower drain pipe (41), and a floating water pipe (42). The water collection box (4) is fitted onto the end of the water inlet pipe (11). The bottom of the water collection box (4) is connected to the fixed lower drain pipe (41). The floating water pipe (42) is fitted onto the fixed lower drain pipe (41). The floating water pipe (42) has two collars (44) fitted on its upper half. The top side wall of the floating water pipe (42) is fitted with a limit ring. The floating water pipe (42) has a float block (43) fitted near its bottom end. The floating water pipe (42) has multiple drainage holes (421) on its bottom side wall.
3. The buffer tank oil-water separator according to claim 1, characterized in that: The oil filter box (5) has an opening at the top and a drainage hole at the bottom. The oil filter box (5) is provided with a polytetrafluoroethylene filter membrane layer (53), a gauze layer (52) and a wire mesh layer (51) from bottom to top.
4. The buffer tank oil-water separator according to claim 3, characterized in that: The first drain pipe (13) has an extension pipe (132) screwed onto it inside the oil removal tank. The water outlet of the extension pipe (132) is located above the oil filter box (5).
5. The buffer tank oil-water separator according to claim 1, characterized in that: The diameter of the filter micropores is 20-80 nm.
6. The buffer tank oil-water separator according to claim 1, characterized in that: The oil drain pipe (12) is a square pipe, and the oil drain pipe (12) gradually decreases in height from the oil inlet end to the oil outlet end.