Air floatation disturbance diversion synergetic oil-water separation system and tubular pump oil-water separation method thereof

Abstract

The invention discloses an air floatation disturbance diversion synergetic oil-water separation system and a tubular pump oil-water separation method thereof.The air floatation disturbance diversion synergetic oil-water separation system comprises a device body, and an oil-water separation cavity is formed in the device body; a steady flow plate group is arranged in the oil-water separation cavity and is used for forming a micro static environment in the oil-water separation cavity in a standing separation stage; a compressed air inlet is formed below the steady flow plate group, is connected with an air supply system and is used for forming a bubble group which floats upwards and penetrates through the steady flow plate group; the flow stabilizing plate group comprises a plurality of parallel plates, the plurality of plates divide the oil-water separation cavity into a plurality of flow guide channels, and the flow guide channels are used for guiding bubbles to change directions in the rising process, so that the bubble groups can form comprehensive scouring force on the inner wall surfaces of the flow guide channels. According to the invention, through cooperation of air floatation active disturbance, the direction-changing guiding effect of the flow guide channel on bubble floating and the oil-water separation effect, the separation efficiency is controllable, and meanwhile, the self-cleaning of the system can be realized, so that the oil-water separation efficiency is kept stable.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation equipment technology, and in particular to an air flotation disturbance-guided flow-coordinated oil-water separation system and its axial flow pump oil-water separation method. Background Technology

[0002] Axial flow pumps, as low-head, high-flow drainage and irrigation equipment, are widely used in flood control and irrigation operations in low-lying areas. Their water guide bearings operate submerged underwater for extended periods. During pump shaft rotation, water is easily introduced into the water guide oil chamber, causing oil emulsification. When the water content in the oil chamber exceeds a critical value, the emulsified oil loses its lubricating and cooling properties, easily leading to serious accidents such as bearing failure and impeller impact.

[0003] Currently, a gravity box is often used to separate the emulsion in the water-oil guiding chamber of the cross-flow pump for oil-water separation. However, during long-term use, it has been found that some oil stains adhere to the inner wall of the gravity box and the surface of its internal functional structures. As the usage time increases, the adhered oil stains affect the separation effect, resulting in a decrease in oil-water separation efficiency. Furthermore, the equipment needs to be disassembled frequently for cleaning and maintenance, which increases the operation and maintenance costs and workload, and affects the continuous and stable operation of the cross-flow pump. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides an air flotation disturbance and flow guiding synergistic oil-water separation system and its axial flow pump oil-water separation method. By combining the active disturbance of air flotation with the guiding channel to redirect the rise of air bubbles and its separation effect on oil and water, the separation efficiency can be controlled while the system can achieve self-cleaning, thereby maintaining stable oil-water separation efficiency.

[0005] Technical Solution: To achieve the above objectives, the present invention provides an air-float disturbance-guided flow-coordinated oil-water separation system and its axial-flow pump oil-water separation method, comprising a device body, an oil-water separation chamber, and a flow-stabilizing plate assembly within the oil-water separation chamber. The flow-stabilizing plate assembly is used to create a micro-static environment within the oil-water separation chamber during the static separation stage. An oil-water mixture inlet is located above the flow-stabilizing plate assembly. A compressed air inlet is located below the flow-stabilizing plate assembly and is connected to an air supply system to form a bubble cluster that floats and passes through the flow-stabilizing plate assembly. The flow-stabilizing plate assembly includes several parallel plates, which divide the oil-water separation chamber into multiple flow-guiding channels. These channels guide the bubbles to change direction during their ascent, enabling the bubble cluster to exert a comprehensive scouring force on the inner wall of the flow-guiding channels.

[0006] Furthermore, a textured structure layer is provided on the surface of the plurality of plates and the inner cavity surface of the device body.

[0007] Furthermore, the surface of the textured structure layer is provided with an oleophobic coating.

[0008] Furthermore, the plate is inclined or vertically disposed within the cavity of the device body.

[0009] Furthermore, the plate is a corrugated plate or a flat plate.

[0010] Furthermore, the oleophobic coating is one of the following: a fluorinated silane oleophobic nanocoating, a polytetrafluoroethylene nanocoating, or a ceramic-based oleophobic coating.

[0011] Furthermore, the surface of the textured structure layer is provided with a hydrophobic coating.

[0012] Furthermore, the textured structure layer includes micron-scale grooves or columnar structures.

[0013] Furthermore, the compressed air inlet is connected to the air duct network through an intake pipe, and the intake pipe is equipped with a normally closed solenoid control valve, which is electrically connected to the host computer configuration software.

[0014] Furthermore, the structure of the flow guide channel and the air intake method of the compressed air inlet are adjusted according to the length of the maintenance cycle of the axial flow pump unit. When the maintenance cycle is long, a first flow guide channel is first constructed using the flow stabilizing plate assembly, making the inner wall surface of the first flow guide channel an oleophobic surface. Then, a periodic first bubble group is formed through the air supply system. This first bubble group, within one oil-water separation cycle, continuously passes through the first flow guide channel at a low frequency and periodically, scouring its inner wall surface to assist oil droplets in floating. When the maintenance cycle is moderate, a second flow guide channel is first constructed using the flow stabilizing plate assembly, making the second flow guide channel a shallow settling pool structure with an oleophobic and non-sticky inner wall surface. Then, a second bubble group triggered by specific conditions is formed through the air supply system. This second bubble group, within one oil-water separation cycle... Finally, the oil briefly passes through the second guide channel and washes its inner wall to adsorb residual low-buoyancy oil droplets in the second guide channel and carry them to the upper oil layer without disturbing the already formed oil layer. When the maintenance cycle is short, a third guide channel is first constructed through the flow stabilizing plate group. The third guide channel is constructed as a shallow sedimentation pool structure with a hydrophobic inner wall. Then, a periodic third bubble group is formed through the air supply system. The third bubble group is used to perform periodic pulse aeration within one oil-water separation cycle to accelerate the coalescence and detachment of oil droplets in the third guide channel and to disturb and prevent sediment from settling and accumulating in the third guide channel. The inclination of the first guide channel is less than that of the second guide channel, and the inclination of the third guide channel is greater than or equal to that of the second guide channel.

[0015] Beneficial Effects: The air flotation-induced disturbance-guided flow-coordinated oil-water separation system and its axial flow pump oil-water separation method of the present invention establish a steady-state environment within the system that conforms to static oil-water separation by setting up plate groups for flow stabilization. Based on this, by adding an air flotation system and utilizing a three-level synergy of plate group surface modification, plate group structure adjustment, and air flotation strategy adaptation, controllable adjustment of oil-water separation efficiency and a corresponding self-cleaning mode are achieved. This allows the oil-water separation system to adapt to the oil-water separation efficiency requirements at different stages of the axial flow pump's life cycle while preventing the adhesion of oil and sediment to the surfaces of internal functional components, thus solving the problem of separation efficiency stability. This enables the oil-water separation system to maintain a long-term stable separation effect without the need for frequent disassembly and cleaning during long-term use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the oil-water separation system according to Embodiment 1 of the present invention.

[0017] Figure 2 This is a schematic diagram of the oil-water separation system in Embodiment 2 of the present invention.

[0018] Figure 3 This is a schematic diagram of the oil-water separation system in Embodiment 3 of the present invention. Detailed Implementation

[0019] This solution applies to oil-water separation in the oil chamber of the water-guided bearing of a cross-flow pump. In actual operation, due to factors such as the performance of the sealing system, the assembly precision of the pump shaft, and the difference in water levels between upstream and downstream, the water intake conditions and maintenance cycles of different cross-flow pump systems vary. Currently, maintenance is mostly carried out through periodic shutdowns. From the working process of the oil-water separation device, the oil-water mixture is usually periodically discharged into the device, relying on long periods of settling to achieve natural stratification. However, newly discharged oil-water mixtures can easily disturb the already separated oil and water layers, affecting the separation effect. Therefore, it is usually necessary to discharge the already stratified oil and water separately before discharging new mixtures. This means that for pump sets with different maintenance cycles, the allowable settling time for oil-water mixtures varies, which also places different demands on the separation efficiency of the separation device. To adapt to the separation efficiency requirements under different operating conditions, the following provides several specific embodiments in conjunction with the accompanying drawings to further illustrate the present invention.

[0020] Example 1, as shown in the appendix Figure 1 The aforementioned air flotation disturbance guiding oil-water separation system is applied to a cross-flow pump system with moderate oil-water separation efficiency requirements. It includes a box-shaped device body 1, with an oil extraction pipeline installed on the top of the box-shaped container to extract the oil layer, and a drain solenoid valve installed at the center of the bottom of the box-shaped container and connected to a wastewater collection system so as to discharge the separated oil and water layers before new mixtures are discharged.

[0021] The container housing is equipped with a flow stabilizing plate assembly 2, whose multiple layers of plates 21 are installed parallel to each other at the same inclination angle within the container housing. The inclination angle of the plates is approximately 45° to 60°, and the spacing between the plates is approximately 20 mm, thus forming several inclined flow guiding channels. Utilizing the shallow pool principle of the inclined plate assembly, the rising distance of oil droplets or the sinking distance of water droplets is shortened, thereby further accelerating oil-water separation based on gravity and meeting the requirements for medium separation efficiency.

[0022] The flow stabilizing plate assembly 2 is located in the middle of the container, ensuring that the separation of the emulsion layer always occurs between the plates. An oil-water mixture inlet 11 is located above the flow stabilizing plate assembly 2, and a compressed air inlet 12 is located below it. The compressed air inlet 12 is connected to the plant's 0.4MPa instrument air duct network via a copper pipe. A miniature normally closed electromagnetic control valve 3 is installed in the copper pipe. This valve is electrically connected to the host computer configuration software, allowing for the setting of ventilation time and intervals to achieve automated control of air flotation agitation cleaning. A single opening time is typically 2-8 seconds, introducing compressed air at a pressure controlled at 0.15-0.3MPa into the container to form a large number of micron-sized bubbles in the liquid. The compressed air inlet is positioned relatively close to the bottom of the container to handle the agitation caused by the incoming gas, dispersing the sediment deposited at the bottom for easy discharge with the wastewater.

[0023] In this embodiment, the control system is configured to automatically trigger the micro normally closed solenoid valve 3 to open for 5 seconds 5 minutes before the next planned shutdown after the axial flow pump unit has run continuously for 168 hours (approximately one week). During this time, 0.2 MPa compressed air enters the container through the compressed air inlet, generating a large number of micron-sized bubbles in the bottom area directly opposite the flow stabilizer assembly 2. As the bubbles rise, they pass through the guide channel. After 5 seconds, the micro normally closed solenoid valve 3 closes, and the system returns to a static separation state.

[0024] Both the plate 21 and the box body are made of 304 stainless steel. After sandblasting roughening treatment, a textured structure layer 211 is formed on the surface of the plate and the inner cavity of the box. Then, an oleophobic coating 212 is coated on the sandblasted surface. The core purpose is to make the inner surface of the guide channel into an oleophobic surface with uniformly distributed micro-protrusions or textures. This makes it difficult for oil stains to adhere to the inner wall of the plate or container. Under long-term static separation, larger oil droplets can float to the surface due to their own buoyancy. In the end, only a small number of micro-oil droplets may remain on the inner surface of the guide channel due to insufficient buoyancy. In the air flotation cleaning stage, the uniformly distributed protrusions and textures on the surface can prevent air bubbles from sliding directly up the plate surface and causing short circuits. Instead, after contacting the plate surface, the air bubbles are guided to continuously change direction, thereby more thoroughly rinsing each plate surface and adsorbing the residual micro-oil droplets on the plate surface, achieving true comprehensive self-cleaning.

[0025] The oleophobic coating 212 is preferably a nano-coating of a fluorinated silane or silica-based superoleophobic material. Both have a static contact angle of not less than 110° with lubricating oil, which can significantly reduce the adhesion of oil droplets to the solid surface, making it difficult for residual oil to adhere firmly, and thus easier to be peeled away by rising air bubbles. For example, when a layer of fluorinated silane oleophobic nano-coating with a thickness of about 5 μm is sprayed on a sandblasted roughened surface, its static oil droplet contact angle is measured to reach 115°. Moreover, this type of material is also hydrophobic, so that oil droplets only need to float to contact the bottom surface of the upper plate 21, and can slide along the bottom surface of the plate, and eventually detach from the high end of the plate and float up. Water droplets only need to sink to contact the upper surface of the lower plate 21, and can slide and converge along the upper surface of the plate, and eventually detach from the low end of the plate and sink. Thus, an oil-water crossflow is formed in the inclined flow channel. Therefore, in addition to maintaining the separation efficiency by achieving self-cleaning through passive anti-sticking, this coating will further improve the separation efficiency.

[0026] If the working environment of the axial flow pump system has a high sediment content, it may result in a high sediment content in the oil-water mixture. In this case, the oleophobic coating 212 can be a polytetrafluoroethylene nano-coating with a thickness of 10μm. In addition to its excellent oleophobic properties, this coating also has wear resistance and anti-stick properties, which can effectively prevent sediment from accumulating on the surface of the plates and reduce the wear of the plates by sediment as it flows with the water. While maintaining the separation efficiency, it will also further extend the service life of the equipment.

[0027] In other embodiments, other coating materials with good oleophobic effects, such as ceramic-based oleophobic coatings, may also be selected.

[0028] The plate 21 can be a corrugated plate or a flat plate. In this embodiment, a corrugated plate is preferred. The dense corrugated channels formed by the plate divide a large space into multiple smaller channels. These narrow channels suppress large-scale convection, thereby maintaining a micro-static environment. This ensures that during the static separation stage and the air flotation self-cleaning stage before entering the next separation stage, the separated oil and water layers are unaffected by natural convection or weak circulation caused by factors such as temperature changes, minor vibrations, and disturbances immediately after air flotation stops.

[0029] Furthermore, the undulating channels created by the corrugated plates further force the bubbles to continuously change direction, thereby guiding the bubbles to distribute more evenly and achieving more comprehensive scouring. At the same time, the undulations of the corrugated plates also bring the bubbles closer to the plate surface, generating local turbulence and enhancing the scouring force. This enhances the self-cleaning ability of the cleaner.

[0030] In terms of structural stability, corrugated plates have higher structural strength and can maintain shape stability even with thinner plates, making them less prone to deformation. Especially under long-term immersion, they can stabilize the structure of the flow channel, which also maintains the stability of separation efficiency.

[0031] This embodiment utilizes an inclined corrugated plate assembly with an oleophobic surface and uniformly distributed texture to construct an inclined corrugated flow channel. This channel stabilizes the flow within the chamber during the static separation phase, maintaining a micro-static environment for static separation and forming a shallow pool principle to meet moderate separation efficiency requirements. Furthermore, it guides the rising path of air bubbles during the air flotation cleaning phase. Combined with the aforementioned air flotation disturbance strategy, which is only briefly activated five minutes before each maintenance shutdown, micron-sized air bubbles adsorb and carry these tiny oil droplets to the top oil layer as they rise and pass through the flow channel. This achieves self-cleaning of the internal functional structure of the oil-water separator and maintains the stability of its separation efficiency during long-term use. Simultaneously, it prevents these tiny oil droplets from being carried away by the water flow during drainage, effectively reducing the oil content of the wastewater discharge.

[0032] Example 2, as shown in the appendix Figure 2 As shown, this is applied to cross-flow pump systems with low oil-water separation efficiency requirements, where a settling time of several weeks is typically permissible. Compared to Embodiment 1, the difference lies in that the multi-layered plates 21 of the flow stabilizing plate assembly 2 are all installed vertically and parallel within the container, with the plate spacing appropriately reduced compared to Embodiment 1, such as 8-12mm, to enhance the convection suppression effect. In this embodiment, the formed flow guiding channel is a vertical channel. Compared to Embodiment 1, it abandons the active acceleration separation effect brought by the shallow pool principle, instead utilizing the combination of vertical plane and air flotation, making it difficult for oil and silt to accumulate on the plate surface, thus facilitating self-cleaning.

[0033] Meanwhile, with the spacing between adjacent plates reduced, the uniformly distributed texture structure on the surface of plate 21 can present the whole as a vertical flow channel, constructing a tortuous channel on a smaller scale. This disrupts the straight upward path of the bubbles, thus also guiding the bubbles to continuously change direction during the rising process, achieving the purpose of comprehensive self-cleaning.

[0034] In this embodiment, plate 21 can also be a corrugated plate or a flat plate, but it is preferred to be a corrugated plate. Its corrugation angle is usually selected to be 45° with the vertical direction, which can achieve a balance between providing a tortuous path for the fluid to stabilize the flow field and providing a smooth channel for the bubbles to facilitate cleaning.

[0035] In this embodiment, the control system is configured such that after the axial flow pump unit has been running continuously for several weeks (e.g., one month), upon planned shutdown, the valve of the oil-water mixture return pipe is opened. The oil-water mixture is then fed into the container via gravity return or active pump removal. After feeding is complete, the valve is closed, and the system is sealed. Subsequently, a long-term static separation phase begins. During this process, oil droplets rise slowly due to their own buoyancy, while water droplets sink slowly due to gravity. The corrugated plate assembly primarily provides stable multi-layered channels to prevent convection disturbances. Periodic air flotation self-cleaning is performed during the static period. Starting from the beginning of the static phase, the miniature normally closed electromagnetic control valve 3 is automatically triggered to open once per week, each opening lasting approximately 5-10 minutes. The generated microbubbles rise and gently wash the plate surface, peeling off and adsorbing the trace oil film on the oleophobic layer to the top oil layer. After air flotation stops, the system returns to the static separation state.

[0036] The bubble size can be slightly larger than that of conventional air flotation, approximately 60-90 μm, to reduce disturbance to the oil layer. The flotation intensity should be such that bubbles can be seen rising uniformly without causing significant turbulence.

[0037] This embodiment utilizes a vertical corrugated plate assembly with an oleophobic surface and uniformly distributed texture to construct a vertical, narrow-slot corrugated flow channel. With ample settling time, the arrangement of the plates increases the difficulty of oil or silt adhesion. Combined with periodic, comprehensive flushing by air flotation, self-cleaning of the plate assembly and the inner wall of the container is achieved. In this embodiment, air flotation primarily assists in the flotation of oil droplets. Although the separation time is sufficient, some floating still occurs in actual use. Therefore, the frequency of air flotation within a separation cycle can be adjusted based on the thickness of the residual emulsion layer after each separation. A thicker residual emulsion layer requires a higher air flotation frequency. On one hand, self-cleaning maintains the microstructure of the inner wall surface of the flow channel, thus maintaining separation efficiency over long-term use. On the other hand, periodic air flotation assists the separation process, promotes the flotation of tiny oil droplets, and reduces the oil content in wastewater discharge.

[0038] Example 3, as shown in the appendix Figure 3As shown, the plate arrangement is similar to that of Embodiment 1, and the installation angle of the plate 21 can be adjusted according to the separation efficiency requirements. The difference lies in that the textured structure layer 211 on the surface of the plate 21 is finely processed into micron-level grooves or columnar structures, and the surface of the textured structure layer 211 is coated with a hydrophobic coating 213. Simultaneously, the air flotation system uses a higher frequency, smaller bubble pulse air distribution method to reduce turbulence disturbance and increase the participation rate and auxiliary role of air flotation in the separation stage.

[0039] Based on the principle of shallow pools, this also enables the flow stabilizing plate group 2 to coalesce oil. Its hydrophobic surface makes it relatively oleophilic. When water droplets settle to the lower plate surface, they quickly converge to form large droplets and accelerate their slide. When they detach from the plate surface, the large droplets sink even faster, and the liquid level of the lower aqueous phase rises significantly. When oil droplets float to the upper plate surface, they spread and coalesce on the plate surface. Combined with pulsed micro-air flotation, this allows the tiny oil droplets in the guide channel to be captured and accelerated to float to contact the plate surface, preventing small oil droplets from being carried away by the rapidly sinking water flow. On the other hand, it promotes the rapid coalescence of oil droplets of all sizes on the plate surface. Furthermore, due to the unique micro-texture structure of the plate surface, although oil droplets spread across the surface, the actual solid contact area is reduced by the structure. Simultaneously, cavitation or water pockets may exist within this microstructure, meaning that while the oil droplets are surface-friendly, they do not adhere firmly to the plate. When oil droplets of varying sizes coalesce and grow to a certain size, minute changes in gravity cause them to detach from the tips of these surface microstructures. The gas-oil complex formed by the grown oil droplets and bubbles possesses greater buoyancy, further accelerating its ascent and achieving the goal of high separation efficiency. At the same time, oil and sediment cannot remain on the plate surface for long, preventing them from becoming contaminants that affect separation efficiency, thus maintaining stable separation efficiency over long-term use.

[0040] In this embodiment, unlike Embodiments 1 and 2, the problem of oil and silt adhesion is not solved by air flotation disturbance + passive anti-adhesion. Instead, the air flotation function is transformed from cleaning by rinsing or adsorbing tiny oil droplets on the plate surface to promoting the further accelerated floating of tiny oil droplets in the shallow pool during the separation process. This improves the aggregation efficiency of oil droplets on the plate surface. Combined with the characteristics of growing oil droplets and the special microstructure of the plate surface, a self-cleaning mode of plate surface is achieved by the autonomous detachment of oil droplets. Furthermore, the high-frequency air flotation disturbance and the water flow convergence effect brought by the hydrophobic surface make it difficult for silt to form deposits and solidify on the plate surface. While further improving the separation efficiency, the cleanliness of the plate surface is also guaranteed, achieving a long-term stable high separation efficiency.

[0041] When the required separation efficiency of an oil-water separation system increases, it often indicates a risk of sealing system failure, leading to a significant increase in water inflow into the bearing oil chamber and a markedly shorter downtime maintenance cycle. Furthermore, with the operation of the axial flow pump unit, the failure process of the sealing system may accelerate, potentially further shortening and accelerating the oil-water separation cycle. If this is not detected in time, the mismatch between oil-water separation efficiency and unit maintenance cycle may result in impure oil being recycled to the oil storage tank for reuse, or an increase in the oil content of wastewater discharge.

[0042] Therefore, based on this embodiment, the plate 21 can be further configured to have an adjustable tilt angle. For example, each plate 21 can be installed relative to the housing via a separate rotating shaft, and multiple rotating shafts can be connected through a transmission structure to achieve synchronous adjustment of multiple plates 21 in the same direction and at the same angle. For example, adjacent rotating shafts can be connected by a gear set, with one rotating shaft acting as the drive shaft and driven by a stepper motor to precisely control the angle. The stepper motor can be connected to a controller or the configuration software of a host computer. By monitoring the water inlet velocity of the bearing oil chamber of the axial flow pump unit, the plate 21 can be adjusted to a suitable tilt angle before each input of the oil-water mixture into the separation system. When the water inlet velocity increases, the tilt angle is reduced, as a smaller tilt angle can obtain a larger projected area, thereby improving the separation efficiency. When the water inlet velocity decreases, the tilt angle is increased, as a larger tilt angle can obtain a stronger sludge discharge capacity, allowing the sludge to slide off more smoothly.

[0043] Based on the above three embodiments, this solution can meet the bearing cavity oil-water separation requirements of the axial flow pump system throughout its entire life cycle. In the early stages, the equipment's sealing system is intact, the unit operates stably, and the water inflow rate into the bearing oil cavity may only be affected by environmental factors, such as the pressure difference between upstream and downstream, resulting in a slow overall inflow rate and a unit maintenance cycle of several weeks. During this stage, there is sufficient separation time, and Embodiment Two, with its strong self-cleaning ability but lower separation efficiency, can be selected. As the unit operates for a long time, the sealing system experiences wear, accelerating the water inflow rate into the bearing oil cavity. The unit maintenance cycle is affected and shortened to about one week. During this stage, Embodiment One, with its moderate separation efficiency and self-cleaning ability, can be selected. When the unit's operating time reaches a certain period, the wear of the sealing system intensifies, and the failure process accelerates. The unit maintenance cycle is significantly shortened. At this stage, Embodiment Three, with its high separation efficiency and moderate self-cleaning ability but slightly higher operating energy consumption, can be used. This not only meets the separation efficiency requirements at each stage but also, from a life-cycle perspective, achieves a balance between separation efficiency, self-cleaning ability, and energy consumption, resulting in excellent overall separation efficiency stability. There is no need for tedious periodic disassembly and cleaning, and there is no risk of decreased separation efficiency with long-term use.

[0044] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the above principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A combined air flotation-induced disturbance-guided flow oil-water separation system, characterized in that: The device includes a main body (1), an oil-water separation chamber (10) is provided inside the main body (1), a flow stabilizing plate group (2) is provided inside the oil-water separation chamber (10), the flow stabilizing plate group (2) is used to form a micro-static environment in the oil-water separation chamber (10) during the static separation stage; an oil-water mixture inlet (11) is provided above the flow stabilizing plate group (2). A compressed air inlet (12) is provided below the flow stabilizer plate group (2). The compressed air inlet (12) is connected to the air supply system and is used to form a group of bubbles that float and pass through the flow stabilizer plate group (2). The flow stabilizing plate assembly (2) includes several parallel plates (21). The multiple plates (21) divide the oil-water separation chamber (10) into multiple flow channels. The flow channels are used to guide the bubbles to change direction during their ascent, so that the bubble group can form a comprehensive scouring force on the inner wall of the flow channels.

2. The air flotation disturbance guiding synergistic oil-water separation system according to claim 1, characterized in that: The surfaces of the multiple plates (21) and the inner cavity of the device body (1) are provided with textured structure layers (211).

3. The air flotation disturbance guiding and coordinated oil-water separation system according to claim 2, characterized in that: The textured structure layer (211) has an oleophobic coating (212) on its surface.

4. The air flotation disturbance guiding synergistic oil-water separation system according to claim 3, characterized in that: The plate (21) is inclined or vertically disposed in the cavity of the device body (1).

5. The air flotation disturbance guiding and coordinated oil-water separation system according to claim 4, characterized in that: The plate (21) is a corrugated plate or a flat plate.

6. The air flotation disturbance guiding synergistic oil-water separation system according to claim 3, characterized in that: The oleophobic coating (212) is one of the following: fluorosilane oleophobic nanocoating, polytetrafluoroethylene nanocoating, and ceramic-based oleophobic coating.

7. The air flotation disturbance guiding synergistic oil-water separation system according to claim 2, characterized in that: The surface of the textured structure layer (211) is provided with a hydrophobic coating (213).

8. The air flotation disturbance guiding synergistic oil-water separation system according to claim 7, characterized in that: The textured structure layer (211) includes micron-sized grooves or columnar structures.

9. The air flotation disturbance guiding and coordinated oil-water separation system according to claim 1, characterized in that: The compressed air inlet (12) is connected to the air duct network through the air intake pipe. The air intake pipe is equipped with a normally closed electromagnetic control valve (3), which is electrically connected to the host computer configuration software.

10. A method for oil-water separation using a cross-flow pump employing the oil-water separation system according to any one of claims 1-9, characterized in that: Adjust the structure of the flow channel and the air intake method of the compressed air inlet (12) according to the length of the maintenance cycle of the axial flow pump unit; When the maintenance cycle is long, a first flow channel (221) is first constructed through the flow stabilizing plate group (2), so that the inner wall surface of the first flow channel (221) is constructed as an oleophobic surface; then a periodic first bubble group is formed through the air supply system, and the first bubble group continuously passes through the first flow channel (221) and washes its inner wall surface at a low frequency and periodically within one oil-water separation cycle to assist the oil droplets to float; When the maintenance cycle is appropriate, the second flow channel (222) is first constructed through the flow stabilizing plate group (2), so that the second flow channel (222) is constructed as a sedimentation shallow pool structure with an oil-repellent and non-sticky inner wall surface; then the second bubble group is formed by the air supply system under specific conditions. At the end of an oil-water separation cycle, the second bubble group briefly passes through the second flow channel (222) and washes its inner wall surface to adsorb the residual low buoyancy oil droplets in the second flow channel (222) and carry them to the upper oil layer without disturbing the already formed oil layer. When the maintenance cycle is short, a third flow channel (223) is first constructed through the flow stabilizing plate group (2). The third flow channel (223) is constructed as a shallow sedimentation pool structure with a hydrophobic inner wall. Then, a periodic third bubble group is formed through the air supply system. The third bubble group is used to perform periodic pulse aeration within one oil-water separation cycle to accelerate the coalescence and detachment of oil droplets in the third flow channel (223) and to disturb and prevent sediment from settling and accumulating in the third flow channel (223). The inclination of the first flow channel (221) is less than that of the second flow channel (222), and the inclination of the third flow channel (221) is greater than or equal to that of the second flow channel (222).

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