Oil-water separation device and oil-water separation system

Abstract

The present invention relates to the technical field of oil-water separation treatment of oily wastewater, and discloses an oil-water separation device and an oil-water separation system, wherein the oil-water separation structure comprises: a separation tank, provided with an oil-containing particle wastewater inlet, an oil particle outlet and a water outlet; and an oil-water separation plate which is annular and arranged in the separation tank around the oil-containing particle wastewater inlet; wherein the oil-water separation plate comprises an oleophilic region, the oleophilic region is arranged to be able to adsorb oil particles in the wastewater entering the separation tank through the oil-containing particle wastewater inlet, and filter water molecules in the wastewater, so that the oil particles and water molecules in the wastewater are separated, and the oleophilic region is also arranged to enable the adsorbed oil particles to aggregate and eventually move upwards and away from the oil-water separation plate under the action of buoyancy. The present invention solves the technical problems existing in the prior art that a separate oil-water separator is required or the oil-water separation structure is complicated, resulting in poor oil-water separation effect, large floor space occupied by the oil-water separation equipment, and high cost.

Description

Technical Field

[0001] The invention relates to the technical field of oil-water separation treatment of oily wastewater, and in particular to an oil-water separation device and an oil-water separation system. Background Art

[0002] my country's resource structure is characterized by "rich in coal, less oil, and some gas", and my country's booming industrial development has put forward an increasing demand for oil supply. However, in recent years, my country's oil resources have become increasingly scarce, and the pressure on oil supply has increased unprecedentedly.

[0003] At present, many domestic oil fields have entered the high water content production stage. The high water content in the produced fluid directly affects the quality of the produced oil. In addition, a large amount of oily wastewater is generated during the oil production process. Oil-water separation and treatment technology is increasingly valued in the oil production field.

[0004] In order to solve the above problems in the prior art, an oil-water separator is additionally provided, which greatly increases the space occupied and the cost of oil-water separation. For example, CN212800003U discloses an environmentally friendly oil-water separation device, which separates oil and water through an oil-water separation membrane and is provided with a liquid inlet heating pipe. Oil-water separation is achieved by heating the oil and separating it with the oil-water separation membrane. However, the flow direction of the oil in the device is from top to bottom. During the separation process, the solid particles in the oil will adhere to the oil-water separation membrane and are not easy to peel off from the oil-water separation membrane. After a period of separation, the effect of oil-water separation will be greatly reduced, and its long-term stability is not good.

[0005] For example, CN108585095B discloses a loaded cycle stacked flotation separation device and an enhanced oil-water separation method, which constructs a two-stage flotation series stacked in space, and realizes material exchange and hydraulic connection between stages through gas migration and transportation. At the same time, the spatial stacking layout achieves the purpose of driving the two-stage flotation in sequence with a single gas input, effectively improving the gas utilization efficiency and oil-water separation efficiency. However, the device has a complex structure and requires additional equipment, which greatly increases the space and cost of oil-water separation. Summary of the invention

[0006] The purpose of the present invention is to overcome the technical problems in the prior art that a separate oil-water separator is required or the oil-water separation structure is complex, resulting in poor oil-water separation effect, large floor space and high cost of the oil-water separation equipment.

[0007] In order to achieve the above objectives, the present invention provides an oil-water separation device on one hand.

[0008] The oil-water separation structure comprises:

[0009] A separation tank, wherein the bottom of the separation tank is provided with an inlet for wastewater containing oil particles, the upper part of the separation tank is provided with an outlet for oil particles, and the lower part of the separation tank is provided with a water outlet; and

[0010] An oil-water separation plate, the oil-water separation plate is annular and is arranged in the separation tank around the oil-containing particle wastewater inlet, the oil particle outlet is communicated with the inner ring area enclosed by the oil-water separation plate, and the water outlet is communicated with the outer ring area enclosed by the oil-water separation plate and the separation tank;

[0011] The oil-water separation plate includes an oleophilic region, which is configured to adsorb oil particles in the wastewater entering the separation tank through the oil-containing particle wastewater inlet and filter water molecules in the wastewater to separate the oil particles and water molecules in the wastewater. The oleophilic region is also configured to allow the adsorbed oil particles to aggregate and eventually move upward under the action of buoyancy to separate from the oil-water separation plate.

[0012] The present invention provides an oil-water separation device, which separates the separation tank into an inner ring area with a wastewater inlet and an outer ring area with a water outlet by arranging an oil-water separation plate in the separation tank, and by arranging the oil-water separation plate to have the ability to adsorb oil particles entering the separation tank through the oil-containing particle wastewater inlet and filter water molecules in the wastewater, so that the oil particles and water molecules in the wastewater are separated, so that the oil particles are retained in the inner ring area through the oil-water separation plate, and the water molecules separated from the oil particles enter the outer ring area through the oil-water separation plate under the action of water pressure, thereby realizing the separation of the oil particles and water molecules in the oil-containing particle wastewater, and at the same time, the oil particles adsorbed in the oleophilic area of ​​the oil-water separation plate are aggregated and finally move upward under the action of buoyancy to separate from the oil-water separation plate, so that the aggregation of oil particles on the oil-water separation plate can be avoided, so that the oil-containing particle wastewater can be treated sustainably and efficiently. Thus, the technical problems existing in the prior art that the oil-water separator needs to be separately arranged or the oil-water separation structure is complicated, resulting in poor oil-water separation effect, large area occupied by the oil-water separation equipment, and high cost are solved.

[0013] Preferably, the oil-water separation plate comprises an oleophobic region, and the oleophobic region is arranged above the oleophilic region (201) to isolate the flow of water molecules between the upper part of the inner ring region and the upper part of the outer ring region.

[0014] Preferably, the oil-water separation plate includes at least one of the following configurations:

[0015] Mode 1: The plate wall of the oil-wet area of ​​the oil-water separation plate on one side of the inner ring area is arranged in a corrugated shape;

[0016] Mode 2: The density of the material in the oleophilic region of the oil-water separation plate gradually decreases along the direction from the inner ring region to the outer ring region.

[0017] Preferably, the separation tank is provided with an annular partition plate, which divides the separation tank into multiple chambers, and the multiple chambers are each provided with the oil-containing particle wastewater inlet and the oil-water separation plate; the oil-water separation plate divides the chamber into an oil particle gathering area surrounding the oil-containing particle wastewater inlet and connected to the oil particle outlet, and a water area connected to the water outlet.

[0018] Preferably, the separation tank includes a partition plate, which divides the inner cavity of the separation tank into a first chamber and a second chamber, and the oil-water separation plate includes a first oil-water separation plate arranged in the first chamber and a second oil-water separation plate arranged in the second chamber.

[0019] Preferably, the area ratio of the oleophilic regions of the first oil-water separation plate and the second oil-water separation plate located on one side of the oil particle accumulation area is the same as the ratio of the wastewater flow rate of the first chamber to that of the second chamber.

[0020] Preferably, the oil-water separation device comprises a wastewater interface end connected to the oil-containing particle wastewater inlet of the oil-water separation structure.

[0021] Preferably, the wastewater interface end includes a first interface pipeline and a second interface pipeline, the first interface pipeline and the second interface pipeline are connected to the oil-containing particle wastewater inlet through a mixing section pipeline, and the second interface pipeline is provided with a centrifugal pump and a microbubble generator to provide power and inject gas to the wastewater in the second interface pipeline, so that it is mixed with the oil-containing particle wastewater injected from the first interface pipeline in the mixing section pipeline.

[0022] Preferably, the first interface pipeline and the second interface pipeline are both tangentially connected to the pipe wall of the mixing section pipeline; and / or, the microbubble generator is a self-priming microbubble generator.

[0023] A second aspect of the present invention provides an oil-water separation system.

[0024] The oil-water separation system includes any one of the above-mentioned oil-water separation devices and a wastewater discharge device arranged upstream of the oil-water separation device, and an oil particle recovery device and a drainage device arranged downstream of the oil-water separation device, the wastewater pipeline of the wastewater discharge device is connected to the wastewater interface end of the oil-water separation device, the oil particle outlet of the oil-water separation device is connected to the oil particle recovery device, and the water outlet of the oil-water separation device is connected to the drainage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a vertical cross-sectional structure of an oil-water separation device in a specific embodiment of the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of the horizontal cross-section structure;

[0027] Figure 3 yes Figure 1 A schematic diagram of the structure of an oil-water separation plate;

[0028] Figure 4 yes Figure 1 Schematic diagram of the structure of the microbubble generator.

[0029] Description of Reference Numerals

[0030] 1. Separation tank; 101. Oil particle wastewater inlet; 102. Oil particle outlet; 103. Water outlet; 2. Oil-water separation plate; 201. Oil-philic area; 202. Oil-phobic area; 3. Partition plate; 4. First chamber; 401. First oil-water separation plate; 5. Second chamber; 501. Second oil-water separation plate; 6. First interface pipeline; 7. Second interface pipeline; 8. Mixing section pipeline; 9. Centrifugal pump; 10. Microbubble generator. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "bottom", "inner", "outer" and "middle" are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0034] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the term "plurality" shall mean two or more.

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] like Figures 1 to 3 As shown, the present invention provides an oil-water separation device, which includes a separation tank 1 and an oil-water separation plate 2. The bottom of the separation tank 1 is provided with an oil-containing particle wastewater inlet 101, the upper part of the separation tank 1 is provided with an oil particle outlet 102, and the lower part of the separation tank 1 is provided with a water outlet 103; the oil-water separation plate 2 is annular and is arranged in the separation tank 1 around the oil-containing particle wastewater inlet 101, the oil particle outlet 102 is connected to the inner ring area surrounded by the oil-water separation plate 2, and the water outlet 103 is connected to the outer ring area surrounded by the oil-water separation plate 2 and the separation tank 1. Among them, the oil-water separation plate 2 includes an oleophilic area 201, and the oleophilic area 201 is configured to be able to adsorb particles in the wastewater entering the separation tank 1 through the oil-containing particle wastewater inlet 101, and filter the water in the wastewater, so as to separate the oil particles and water molecules in the wastewater, and the oleophilic area 201 is also configured to enable the adsorbed oil particles to gather and finally move upward under the action of buoyancy to separate from the oil-water separation plate 2.

[0038] The present invention provides an oil-water separation device, which separates the separation tank into an inner ring area with a wastewater inlet and an outer ring area with a water outlet by arranging an oil-water separation plate in the separation tank, and by arranging the oil-water separation plate to have the ability to adsorb oil particles entering the separation tank through the oil-containing particle wastewater inlet and filter water molecules in the wastewater, so that the oil particles and water molecules in the wastewater are separated, so that the oil particles are retained in the inner ring area through the oil-water separation plate, and the water molecules separated from the oil particles enter the outer ring area through the oil-water separation plate under the action of water pressure, thereby realizing the separation of the oil particles and water molecules in the oil-containing particle wastewater, and at the same time, the oil particles adsorbed in the oleophilic area of ​​the oil-water separation plate are aggregated and finally move upward under the action of buoyancy to separate from the oil-water separation plate, so that the aggregation of oil particles on the oil-water separation plate can be avoided, so that the oil-containing particle wastewater can be treated sustainably and efficiently. Thus, the technical problems existing in the prior art that the oil-water separator needs to be separately arranged or the oil-water separation structure is complicated, resulting in poor oil-water separation effect, large area occupied by the oil-water separation equipment, and high cost are solved.

[0039] In an optional embodiment of the present invention, the oil-water separation plate 2 includes an oleophobic region 202, which is arranged above the oleophilic region 201 to isolate the flow between the water molecules in the upper part of the inner ring region and the upper part of the outer ring region. In a preferred embodiment of the present invention, the oil particles separated from the water molecules will eventually float on the water surface, and the oil particle outlet 102 of the separation tank 1 is connected to the inner ring region through a pipeline to extract the oil particles floating on the water surface. The setting of the oleophobic region 202 can effectively prevent the oil particles from being adsorbed on the oil-water separation plate 2 on the upper layer of the water surface, thereby improving the extraction of oil particles above the water surface by the pipeline connected to the oil particle outlet 102. In a further optional embodiment of the present invention, the liquid level of the inner ring region is located at 1 / 2 to 4 / 5 of the oleophobic region 202 of the oil-water separation plate 2 to prevent the liquid level in the inner ring region from being too high, causing the liquid in the inner ring region to overflow from the top to the outer ring region.

[0040] In an optional embodiment of the present invention, Figure 3 As shown, the plate wall of the oleophilic region 201 of the oil-water separation plate 2 located on one side of the inner ring region is arranged in a corrugated shape, and the corrugated arrangement increases the contact area between the oleophilic region 201 and the wastewater containing oil particles, so that the oleophilic region 201 is conducive to separating the oil particles and water molecules through contact with the wastewater containing oil particles, thereby achieving the effect of aggregating the oil particles, thereby improving the efficiency of oil-water separation. Moreover, the structural arrangement of the corrugated wall plate makes it easier for the oil particles that have gathered into a larger volume to separate from the oil-water separation plate 2 under the flushing of the water inlet, so as to move above the liquid surface, which is convenient for the subsequent extraction of the oil particles.

[0041] In an optional embodiment of the present invention, Figure 3As shown, the density of the material in the oleophilic region 201 of the oil-water separation plate 2 gradually decreases along the direction from the inner ring region to the outer ring region. The oil-water separation plate 2 divides the separation tank 1 into two regions, the inner ring region and the outer ring region, and filters water molecules from the inner ring region to the outer ring region. Therefore, the oil-water separation plate 2 can be said to play a filtering and purification role. When the wastewater containing oil particles is in contact, since the particle size of some oil particles is relatively small, a material with a smaller particle size is required to prevent small particles of oil particles from entering the outer ring region through the material gap, and the water molecules filtered by the small particle material do not need to be filtered again, and it is easy for water molecules to pass from the side of the small particle material to enter the side of the large particle material, and the water molecules on the side of the large particle material are more likely to remain on the side of the large particle material under the condition of limited water pressure. At the same time, the small particle material is arranged on the side close to the inner ring region, which can avoid the adhesion of oil particles on the oil-water separation plate 2, and avoid the oil particles being immersed in the oil-water separation plate 2 and unable to detach due to the excessive adsorption of the oil particles by the material particles being too large.

[0042] In a further optional embodiment of the present invention, the material of the oil-water separation plate 2 is an inorganic salt or a fiber material. The height of the oleophilic region 201 of the oil-water separation plate 2 accounts for 1 / 5 to 1 / 2 of the height of the entire oil-water separation plate 2, the particle size range of the oil-water separation material on the side of the oleophilic region 201 of the oil-water separation plate 2 close to the outer ring region is 50 to 100 μm, and the particle size range of the oil-water separation material of the corrugated structure of the oleophilic region 201 of the oil-water separation plate 2 located on the side of the inner ring region is 10 to 50 μm.

[0043] In an optional embodiment of the present invention, a ring-shaped separation plate 3 is provided in the separation tank 1, and the separation plate 3 divides the separation tank 1 into multiple chambers, each of which is provided with an oily particle wastewater inlet 101 and an oil-water separation plate 2; the oil-water separation plate 2 divides the chamber into an oil particle gathering area surrounding the oily particle wastewater inlet 101 and connected to the oil particle outlet 102, and a water area connected to the water outlet 103. The setting of the separation plate 3 divides the area in the separation tank 1, which can ensure that the oily particle wastewater in different areas can be separated from the oil particles and water molecules at the same time. At the same time, dividing a large area into small areas can more effectively ensure the effect of separating the oil particles and water molecules.

[0044] In a further optional embodiment of the present invention, the separation tank 1 includes a partition plate 3, which divides the inner cavity of the separation tank 1 into a first chamber 4 and a second chamber 5, and the oil-water separation plate 2 includes a first oil-water separation plate 401 disposed in the first chamber 4 and a second oil-water separation plate 501 disposed in the second chamber 5. The area of ​​the oleophilic region 201 of the first oil-water separation plate 401 and the second oil-water separation plate 501 located on one side of the oil particle gathering area is the same as the ratio of the flow rate of the oil-containing particle wastewater in the first chamber 4 to the second chamber 5, so as to ensure that the first chamber 4 and the second chamber 5 are maintained at the same liquid level.

[0045] In an optional embodiment of the present invention, the oil-water separation device includes a wastewater interface end connected to the oil-containing particle wastewater inlet 101 of the oil-water separation structure. The wastewater interface end includes a first interface pipeline 6 and a second interface pipeline 7, and the first interface pipeline 6 and the second interface pipeline 7 are connected to the oil-containing particle wastewater inlet 101 through a mixing section pipeline 8. A centrifugal pump 9 and a microbubble generator 10 are provided on the second interface pipeline 7 to provide power and inject gas to the wastewater in the second interface pipeline 7, so that it is mixed with the particle-containing wastewater injected from the first interface pipeline in the mixing section pipeline 8.

[0046] During the operation of the first interface pipeline 6 and the second interface pipeline 7, the wastewater in the second interface pipeline 7 is accelerated to enter the microbubble generator 10 under the action of the centrifugal pump 9, and the gas is mixed in the microbubble generator 10 by using the flow rate of the wastewater after acceleration. The wastewater after mixing with gas enters the mixing section pipeline 8 and mixes with the wastewater from the first interface pipeline 6, so that the wastewater flowing out of the mixing section pipeline 8 is mixed with a certain amount of gas, so that when entering the separation tank 1, the wastewater containing oil particles is separated from the oil particles and water molecules under the action of the oil-water separation plate 2, and the oil particles adsorbed on the lipophilic area 201 will float above the page under the action of the flow rate of the wastewater entering the separation tank 1 and the gas mixed therein, so that the oil particles are quickly separated from the oil-water separation plate 2 after the water molecules are separated and move above the liquid surface, so that the operating volume of the oil-water separation plate 2 for the wastewater containing oil particles per unit time can be increased. Further improve the operating efficiency, thereby reducing the floor space of the equipment required for the operation while treating the same amount of wastewater.

[0047] In an optional embodiment of the present invention, the second interface pipeline 7 can be a pipeline branch from the drainage point of the first interface pipeline 6. Preferably, 5-10% of the wastewater in the first interface pipeline 6 flows into the second interface pipeline 7 and enters the microbubble generator 10 through the centrifugal pump 9. The working pressure of the centrifugal pump 9 can be 0.2-0.4MPa, and then the wastewater from the first interface pipeline 6 is intensively mixed in the mixing section pipeline 8. Thereby reducing the injection of air into all the wastewater in the first interface pipeline 6, while ensuring that the gas injection wastewater has the effect of assisting the aggregation and floating of oil particles, so as to save energy and reduce the production cost. Further optionally, the gas intake of the microbubble generator 10 is 2-5%, and the diameter of the formed microbubbles is 0-50μm.

[0048] In an optional embodiment of the present invention, the microbubble generator 10 may be a self-priming microbubble generator, so as to save energy and facilitate the control of the amount of gas entering. Figure 4 As shown, preferably, the angle between the tapered section of the microbubble generator and the horizontal direction is 15 to 45°, the throat diameter of the microbubble generator is 1 / 30 to 1 / 20 of the inlet diameter of the microbubble generator, the throat length of the microbubble generator is 4 to 10 times its diameter, and the angle between the expansion section of the microbubble generator and the horizontal direction is 15 to 45°, so as to achieve a better bubble generation effect.

[0049] In an optional embodiment of the present invention, in order to ensure that the first interface pipeline 6 and the second interface pipeline 7 are fully mixed in the mixing section pipeline 8, the mixing section pipeline 8 is preferably a cylindrical structure with a transverse area much larger than the first interface pipeline 6 and the second interface pipeline 7. In order to reduce the impact of the wastewater in the first interface pipeline 6 and the second interface pipeline 7 entering the mixing section pipeline 8 on the structure of the mixing section pipeline 8 itself, and at the same time use the flow rate of the wastewater itself for mixing, the first interface pipeline 6 and the second interface pipeline 7 are both tangentially connected to the pipe wall of the mixing section pipeline 8.

[0050] The invention provides an oil-water separation system.

[0051] The oil-water separation system includes any one of the above-mentioned oil-water separation devices and a wastewater discharge device arranged upstream of the separation device, and an oil particle recovery device and a drainage device arranged downstream of the oil-water separation device, wherein the wastewater pipeline of the wastewater discharge device is connected to the wastewater interface end of the oil-water separation device, the oil particle outlet 102 of the oil-water separation device is connected to the oil particle recovery device, and the water outlet 103 of the oil-water separation device is connected to the drainage device.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oil-water separation device, characterized in that: The oil-water separation device comprises: A separation tank (1), wherein the bottom of the separation tank (1) is provided with an oil particle wastewater inlet (101), the upper part of the separation tank (1) is provided with an oil particle outlet (102), and the lower part of the separation tank (1) is provided with a water outlet (103); and an oil-water separation plate (2), the oil-water separation plate (2) being annular and arranged in the separation tank (1) around the oil particle wastewater inlet (101), the oil particle outlet (102) being in communication with an inner annular area enclosed by the oil-water separation plate (2), and the water outlet (103) being in communication with an outer annular area enclosed by the oil-water separation plate (2) and the separation tank (1); The oil-water separation plate (2) comprises an oleophilic region (201), wherein the oleophilic region (201) is configured to adsorb oil particles in wastewater entering the separation tank (1) through the oil-containing wastewater inlet (101), and filter water molecules in the wastewater, so as to separate the oil particles and water molecules in the wastewater, and the oleophilic region (201) is further configured to allow the adsorbed oil particles to aggregate and eventually move upward under the action of buoyancy to separate from the oil-water separation plate (2); The oil-water separation plate (2) comprises an oleophobic region (202), wherein the oleophobic region (202) is arranged above the oleophilic region (201) to isolate the flow of water molecules between the upper part of the inner ring region and the upper part of the outer ring region.

2. The oil-water separation device according to claim 1, characterized in that: The oil-water separation plate (2) includes at least one of the following configurations: Mode 1: The plate wall of the oil-wet area (201) of the oil-water separation plate (2) located on one side of the inner ring area is arranged in a corrugated shape; Mode 2: The density of the material in the oleophilic region (201) of the oil-water separation plate (2) gradually decreases along the direction from the inner ring region to the outer ring region.

3. The oil-water separation device according to claim 1, characterized in that: The separation tank (1) is provided with an annular partition plate (3), the partition plate (3) divides the separation tank (1) into a plurality of chambers, each of the plurality of chambers being provided with the oil particle wastewater inlet (101) and the oil-water separation plate (2); the oil-water separation plate (2) divides the chamber into an oil particle gathering area surrounding the oil particle wastewater inlet (101) and connected to the oil particle outlet (102), and a water area connected to the water outlet (103).

4. The oil-water separation device according to claim 3, characterized in that: The separation tank (1) comprises a partition plate (3), wherein the partition plate (3) divides the inner cavity of the separation tank (1) into a first chamber (4) and a second chamber (5), and the oil-water separation plate (2) comprises a first oil-water separation plate (401) arranged in the first chamber (4) and a second oil-water separation plate (501) arranged in the second chamber (5).

5. The oil-water separation device according to claim 4, characterized in that: The area ratio of the oleophilic region (201) of the first oil-water separation plate (401) to that of the second oil-water separation plate (501) located on one side of the oil particle accumulation region is the same as the ratio of the wastewater flow rate of the first chamber (4) to that of the second chamber (5).

6. The oil-water separation device according to claim 1, characterized in that: The oil-water separation device comprises a wastewater interface end connected to an oil-particle wastewater inlet (101) of the oil-water separation device.

7. The oil-water separation device according to claim 6, characterized in that: The wastewater interface end comprises a first interface pipeline (6) and a second interface pipeline (7); the first interface pipeline (6) and the second interface pipeline (7) are connected to the oil-containing particle wastewater inlet (101) via a mixing section pipeline (8); a centrifugal pump (9) and a micro-bubble generator (10) are provided on the second interface pipeline (7) to provide power and inject gas to the wastewater in the second interface pipeline (7), so that the wastewater is mixed with the oil-containing particle wastewater injected from the first interface pipeline (6) in the mixing section pipeline (8).

8. The oil-water separation device according to claim 7, characterized in that: The first interface pipeline (6) and the second interface pipeline (7) are both tangentially connected to the pipe wall of the mixing section pipeline (8); and / or the microbubble generator (10) is a self-priming microbubble generator.

9. An oil-water separation system, characterized in that: The oil-water separation system comprises an oil-water separation device according to any one of claims 1 to 8 and a wastewater discharge device arranged upstream of the oil-water separation device, and an oil particle recovery device and a drainage device arranged downstream of the oil-water separation device, wherein the wastewater pipeline of the wastewater discharge device is connected to the wastewater interface end of the oil-water separation device, the oil particle outlet (102) of the oil-water separation device is connected to the oil particle recovery device, and the water outlet (103) of the oil-water separation device is connected to the drainage device.

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