Evaluation device and method for occurrence form of dispersed oil drops during rotational flow of oily sewage

Abstract

The invention relates to a device and a method for evaluating the occurrence form of dispersed oil drops during rotational flow of oily sewage, which are applied to the technical field of research on the occurrence form of the dispersed oil drops in the rotational flow process, and the method comprises the following steps: connecting a centrifugal pump with an inlet of a magnetic rotational flow generator through a flow regulating valve, and regulating the flow from a water tank by the flow regulating valve; an outlet of the magnetic spiral flow generator is connected into a sewage recycling box through a back pressure regulating valve; the magnetic spiral flow generator enables mixed fluid of water and oil drops entering the magnetic spiral flow generator to form a spiral flow through a spiral flow generating blade grid arranged on a driving shaft of the magnetic spiral flow generator; capturing an occurrence form of the oil drops under a specific working condition through a high-speed camera; the device provided by the invention can research the influence of a plurality of operation parameters such as flow, pressure and rotating speed on the occurrence form of the dispersed oil drops, realizes transmission without dynamic seal based on a magnetic transmission mode, and is simple in structure and safe and reliable in operation.

Description

Technical Field

[0001] The invention relates to the technical field of research on the occurrence morphology of dispersed oil droplets in a cyclone process, and in particular to a device and method for evaluating the occurrence morphology of dispersed oil droplets in oily wastewater during cyclone flow. Background Art

[0002] Centrifugal technology is widely used in the treatment process of oily wastewater. For example, centrifugal pumps drive wastewater to quickly form a rotational motion through blades, and use the rotating centrifugal force to increase the process pressure; axial flow pumps drive wastewater to quickly form a vortex through blades, and then convert the kinetic energy of rotation into potential energy to increase the process pressure; dynamic cyclone separators drive wastewater to quickly form a vortex through blades, and use the centrifugal force of the vortex to complete the separation of oil and water phases with different densities. However, during the rotation of oily wastewater, the rapid change in speed will cause changes in the morphology of dispersed phase oil droplets in the wastewater, such as being stretched and deformed, or broken under shear and turbulent oscillation. Oil-water separation is an important operation in wastewater treatment operations. According to the Stokes theorem of oil-water separation,

[0003]

[0004] Where Vu is the sedimentation velocity of the oil droplet relative to the water phase, m / s; a is the centrifugal acceleration, m / s 2 ; μ is the viscosity of the continuous phase, Pa; d p is the particle size of the dispersed oil phase, m; Δρ is the density difference between the light and heavy phases, kg / m 3 .

[0005] According to the above formula, the sedimentation rate of oil droplets relative to the water phase is proportional to the square of its particle size. Therefore, particle size is one of the most important factors determining the operation of oil-water separators in sewage treatment. Studying the occurrence form of dispersed phase oil droplets during the swirling process can provide theoretical support for optimizing sewage treatment processes and reducing oil-water treatment costs. It is also one of the important research directions in the field of microdroplets.

[0006] Professors Ibrahim and Maloka of the Libyan Engineering College used a laser particle size analyzer (LPSA) to observe the size distribution of dispersed phase oil droplets after the O / W mixed liquid passed through a centrifugal pump. Professor Rosanel Morales of the University of Tulsa used an ultrasonic online particle size analyzer (UES) to explore the variation of the size distribution of dispersed oil droplets at the outlet of a centrifugal pump with the blade speed, water content and flow rate, and gave a prediction model for the maximum stable size of dispersed oil droplets. However, this type of method can only test the particle size distribution of dispersed phase oil droplets at the outlet of a centrifugal pump, but cannot explore the location where the dispersed phase oil droplets break up, let alone the oil droplet breakup process.

[0007] Zhejiang Sci-Tech University used particle image velocimetry (PIV) to study the streamlines of the fluid inside the blades of a centrifugal pump under different flow conditions. When the centrifugal pump operates under conditions greater than the design flow rate, the velocity distribution law of the flow field is similar to the curvature of the blade, and the velocity gradient in the flow channel is proportional to the flow rate. The dispersed phase oil droplets flowing through it may be broken under the action of strong shear stress; when the inlet flow rate is less than the design flow rate, obvious vortices will appear in the flow channel, among which the vortex at the tail of the pressure blade rotates counterclockwise, while the vortex generated at the tail of the suction blade is clockwise. Although the velocity gradient is very small at this time, the influence of the vortex on the flow field cannot be ignored. At this time, the occurrence morphology of the dispersed phase oil droplets will change more complicated; however, this method can only obtain the flow field characteristics inside the blade and determine the location where the dispersed phase oil droplets may break, but cannot examine the changes and breakup process of the oil droplets, and even ignores the rapid change process of the fluid velocity before entering the blade.

[0008] Perissinotto from the University of Campinas in Brazil observed the changing patterns of the distribution morphology of dispersed-phase oil droplets flowing through the ESP P23 transparent centrifugal pump of Baker-Hughes Company using high-speed camera technology. This method can capture the changing patterns of the distribution morphology of dispersed-phase oil droplets at different positions inside the centrifugal pump blades, but it cannot examine the flow field parameters corresponding to the deformation or breakup positions of the dispersed-phase oil droplets, and also ignores the rapid change process of the fluid velocity before entering the blades.

[0009] In summary, the existing devices and methods for evaluating the morphology of dispersed phase oil droplets during the swirling of oily wastewater mostly discuss the morphology of oil droplets from a macroscopic perspective by analyzing the changes in the outlet particle size, but lack a device to explore the relationship between the morphology of dispersed phase oil droplets and flow field parameters; while taking into account the influence of velocity changes on the morphology of dispersed phase oil droplets during the swirling process of the fluid. Summary of the invention

[0010] In view of this, the purpose of the present invention is to provide a device and method for evaluating the occurrence morphology of dispersed oil droplets in oil-containing wastewater during vortex flow, so as to solve the problem in the prior art that there is a lack of a device to explore the relationship between the occurrence morphology of dispersed phase oil droplets and flow field parameters; while taking into account the influence of velocity changes in the process of fluid vortex formation on the occurrence morphology of dispersed phase oil droplets.

[0011] According to a first aspect of an embodiment of the present invention, there is provided a device for evaluating the morphology of dispersed oil droplets in oily wastewater during cyclone flow, the device comprising:

[0012] Centrifugal pump, flow control valve, magnetic spinner, high-speed camera and back pressure control valve;

[0013] The centrifugal pump is connected to the inlet of the magnetic swirler through a flow regulating valve, and is used to pump water in the water tank into the magnetic swirler through the flow regulating valve. The magnetic swirler is used to form a swirling flow into the fluid entering the magnetic swirler through the swirling blades arranged on its own driving shaft;

[0014] The back pressure regulating valve is connected to the outlet of the magnetic swirler, and the fluid in the magnetic swirler is pumped into the sewage recovery tank through the outlet of the magnetic swirler through the centrifugal pump and the swirling flow of the fluid in the magnetic swirler through the back pressure regulating valve;

[0015] The high-speed camera is arranged at one side of the magnetic whirler, and is used to capture the oil droplets at the entrance of the whirling blade grid of the magnetic whirler.

[0016] Preferably,

[0017] The magnetic spinner comprises: a magnetic seat, a special-shaped quartz beaker, a positioning bearing, a magnetic rotor, a micro-injector, a driving shaft, a spinner blade grid and a sewage collection pipe;

[0018] The swirling blades are fixedly arranged on the top of the driving shaft in a coaxial manner, and a magnetic rotor is fixedly arranged on the bottom of the driving shaft. The magnetic rotor is driven to rotate at a preset speed by a magnetic seat, and the magnetic rotor drives the driving shaft to rotate, and the driving shaft drives the swirling blades to rotate. Through the rotation of the swirling blades, the fluid entering the magnetic swirler forms a swirling flow under the action of the swirling blades;

[0019] The positioning bearing fixes the driving shaft to the bottom of the special-shaped quartz beaker and makes the driving shaft coaxial with the special-shaped quartz beaker;

[0020] The inlet pipeline of the special-shaped quartz beaker is connected to the outlet of the flow regulating valve, so as to allow the water in the water tank to enter the special-shaped quartz beaker;

[0021] A micro-injector is also provided at the inlet pipeline of the special-shaped quartz beaker, and dispersed oil droplets of a specific particle size are injected into the special-shaped quartz beaker through the micro-injector;

[0022] The sewage collecting pipe is arranged on the top of the special-shaped quartz beaker, the sewage collecting pipe is connected to the inlet of the back pressure regulating valve, and the outlet of the back pressure regulating valve is connected to the sewage recovery tank.

[0023] Preferably,

[0024] A flow meter and a pressure gauge are provided between the flow regulating valve and the inlet pipeline of the special-shaped quartz beaker;

[0025] The back pressure regulating valve and the flow regulating valve are adjusted, and the flow meter and the pressure gauge are coordinated to make the pressure and flow in the device meet the preset test environment requirements.

[0026] Preferably,

[0027] The special-shaped quartz beaker is a quartz beaker made of transparent material and has a pressure resistance of 2.0 MPa.

[0028] Preferably, it also includes:

[0029] A background light source is arranged on the other side of the magnetic spinner and is used to provide illumination for the interior of the magnetic spinner.

[0030] According to a second aspect of an embodiment of the present invention, a method for evaluating the morphology of dispersed oil droplets in oily wastewater during cyclone flow is provided. The method is based on any one of the above-mentioned devices for evaluating the morphology of dispersed oil droplets in oily wastewater during cyclone flow, and the method comprises:

[0031] Start the centrifugal pump to pump the water in the water tank into the special-shaped quartz beaker; adjust the flow regulating valve and the back pressure regulating valve so that the pressure and flow in the device meet the preset test environment requirements;

[0032] When the flow and pressure in the device are stable, the magnetic seat is started and adjusted to a predetermined speed. The magnetic seat drives the magnetic rotor to rotate at a predetermined speed through magnetic transmission. The magnetic rotor drives the drive shaft to rotate. The drive shaft drives the swirl blades to rotate synchronously, driving the fluid entering the special-shaped quartz beaker to form a swirl flow.

[0033] The volume of the dispersed oil phase to be injected is calculated according to the predetermined particle size, and the dispersed oil phase is injected into the special-shaped quartz beaker by using the micro-injection pump, thereby forming oil droplets of a specific particle size in the special-shaped quartz beaker;

[0034] Starting the background light source and the high-speed camera arranged on both sides of the magnetic spinner, taking pictures of the oil droplets at the inlet, inside or outlet of the spinner blade cascade by the high-speed camera, and transmitting all the pictures taken to the terminal;

[0035] The terminal uses Image J software to process the photo to obtain the occurrence morphology of the oil droplets at a specific position;

[0036] The physical model of the swirl process of the fluid in the special-shaped quartz beaker under the action of the swirl blades was constructed using Ansys Fluent software. The fluid mechanics parameters affecting the breakup of dispersed oil droplets at the specific position of the oil droplet distribution in the flow field were obtained through numerical simulation analysis.

[0037] The fluid mechanics parameters at a specific position are matched with the occurrence morphology of the oil droplets at the specific position to obtain the matching relationship between the occurrence morphology and fluid mechanics of the dispersed oil droplets during the swirling process.

[0038] Preferably,

[0039] The occurrence form of the oil droplets at the specific position includes: the deformation degree of the deformed and dispersed oil droplets, the fragmentation mode of the broken oil droplets, and the particle size distribution after fragmentation.

[0040] Preferably,

[0041] When the dispersed oil phase is injected into the special-shaped quartz beaker by using the micro-injection pump, only one oil droplet is injected each time to avoid overlapping of multiple oil droplets.

[0042] The technical solution provided by the embodiments of the present invention may have the following beneficial effects:

[0043] In the present application, a centrifugal pump is connected to the inlet of a magnetic swirler through a flow regulating valve. The flow from the water tank is regulated by the flow regulating valve. The outlet of the magnetic swirler is connected to a sewage recovery tank after passing through a back pressure regulating valve. The magnetic swirler forms a vortex of water and oil droplet mixed fluid entering the magnetic swirler through a swirling blade grid arranged on its own driving shaft. The occurrence form of oil droplets under specific working conditions is captured by a high-speed camera. The device provided in the present application can study the influence of multiple operating parameters such as flow, pressure, and rotation speed on the occurrence form of dispersed oil droplets. The transmission without dynamic seal is realized based on the magnetic transmission method. The device has a simple structure and safe and reliable operation.

[0044] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0046] Figure 1 It is a schematic diagram of the overall structure of a device for evaluating the morphology of dispersed oil droplets in oily wastewater during cyclone flow according to an exemplary embodiment;

[0047] Figure 2 is a detailed structural schematic diagram of a magnetic spinner according to another exemplary embodiment;

[0048] Figure 3 is a flow chart showing a method for evaluating the morphology of dispersed oil droplets in oily wastewater during cyclone flow according to another exemplary embodiment;

[0049] In the attached drawings: 1-centrifugal pump, 2-flow regulating valve, 3-magnetic vortexer, 4-background light source, 5-back pressure regulating valve, 6-high-speed camera, 7-pressure gauge, 8-flow meter, 9-micro syringe, 10-special-shaped quartz beaker, 11-sewage collection pipe, 12-vortex blade grid, 13-driving shaft, 14-positioning bearing, 15-magnetic rotor, 16-magnetic seat. DETAILED DESCRIPTION

[0050] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0051] Embodiment 1

[0052] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a device for evaluating the morphology of dispersed oil droplets in oily wastewater during cyclone flow according to an exemplary embodiment. Figure 1 as well as Figure 2 As shown, the device comprises:

[0053] Centrifugal pump 1, flow control valve 2, magnetic spinner 3, high-speed camera 6 and back pressure control valve 5;

[0054] The centrifugal pump 1 is connected to the inlet of the magnetic swirler 3 through the flow regulating valve 2, and is used to pump the water in the water tank into the magnetic swirler 3 through the flow regulating valve 2. The magnetic swirler 3 is used to form a swirling flow into the fluid entering the magnetic swirler 3 through the swirling blades 12 arranged on its own driving shaft 13;

[0055] The back pressure regulating valve 5 is connected to the outlet of the magnetic swirler 3, and the fluid in the magnetic swirler 3 is pumped into the sewage recovery tank through the outlet of the magnetic swirler 3 and the back pressure regulating valve 5 through the centrifugal pump 1 and the fluid swirling flow in the magnetic swirler 3;

[0056] The high-speed camera 6 is arranged on one side of the magnetic vortex generator 3, and the high-speed camera 6 is used to capture the oil droplets at the entrance of the vortex blade cascade 12 of the magnetic vortex generator 3;

[0057] A flow meter 8 and a pressure gauge 7 are provided between the flow regulating valve 2 and the inlet pipeline of the special-shaped quartz beaker 10; the back pressure regulating valve 5 and the flow regulating valve 2 are adjusted, and the flow meter 8 and the pressure gauge 7 are coordinated so that the pressure and flow in the device meet the preset test environment requirements;

[0058] A background light source 4 is disposed on the other side of the magnetic spinner 3 to provide illumination for the inside of the magnetic spinner 3. The background light source 4 cooperates with the high-speed camera 6 to ensure that the photographed photos are clear.

[0059] The special-shaped quartz beaker 10 is a quartz beaker made of transparent material with a pressure resistance of 2.0 MPa. The special-shaped quartz beaker 10 is a transparent material with an inner circle and an outer square structure, which is convenient for the high-speed camera 6 to shoot and can avoid distortion of the shooting picture caused by refraction;

[0060] As attached Figure 2 As shown, the magnetic spinner 3 is composed of a magnetic base 16, a special-shaped quartz beaker 10, a positioning bearing 14, a magnetic rotor 15, a micro-injector 9, a driving shaft 13, a spinner blade 12 and a sewage collection pipe 11; the spinner blade 12 is coaxially fixedly installed on the top of the driving shaft 13, the magnetic rotor 15 is fixedly installed on the bottom of the driving shaft 13, the positioning bearing 14 fixes the driving shaft 13 in the special-shaped quartz beaker 10 and makes the driving shaft 13 coaxial with the special-shaped quartz beaker 10, and the micro-injector 9 is arranged on the inlet pipeline of the special-shaped quartz beaker 10;

[0061] Start the centrifugal pump 1, adjust the flow control valve 2 and the back pressure control valve 5 to the flow and pressure required by the test environment, and after the flow and pressure are stable, start the magnetic seat 16 and adjust it to a predetermined speed. The magnetic seat 16 drives the magnetic rotor 15 to rotate through magnetic transmission, and the blade swirl 12 installed on the drive shaft 13 rotates at high speed with the drive shaft 13, driving the fluid (that is, water and oil droplets) entering the special-shaped quartz beaker 10 to form a swirl, and then the blade swirl 12 constructs a flow field similar to the swirl process of the axial flow pump and the dynamic swirl separator;

[0062] After the conditions for the vortex formation process are established, the volume of the dispersed phase to be injected is calculated according to the predetermined particle size, and the dispersed oil phase is injected using the microinjection pump 9 to form oil droplets of a specific particle size; the background light source 4 and the high-speed camera 6 are started, and the background light source 4 and the high-speed camera 6 are adjusted to ensure clear shooting, and the oil droplets at the entrance of the blade vortex 12 are captured, and all the captured photos are transmitted to the terminal.

[0063] Embodiment 2

[0064] Figure 3 The present invention is a flow chart showing a method for evaluating the morphology of dispersed oil droplets in oily wastewater during cyclone flow according to another exemplary embodiment, the method comprising:

[0065] S1, start the centrifugal pump to pump the water in the water tank into the special-shaped quartz beaker; adjust the flow regulating valve and the back pressure regulating valve so that the pressure and flow in the device meet the preset test environment requirements;

[0066] S2, when the flow and pressure in the device are stable, the magnetic seat is started and adjusted to a predetermined speed, the magnetic seat drives the magnetic rotor to rotate at a predetermined speed through magnetic transmission, the magnetic rotor drives the drive shaft to rotate, the drive shaft drives the swirl blades to rotate synchronously, and drives the fluid entering the special-shaped quartz beaker to form a swirl;

[0067] S3, calculating the volume of the dispersed oil phase to be injected according to the predetermined particle size, and injecting the dispersed oil phase into the shaped quartz beaker using the micro-injection pump, thereby forming oil droplets of a specific particle size in the shaped quartz beaker;

[0068] S4, starting the background light source and the high-speed camera arranged on both sides of the magnetic spinner, taking pictures of the oil droplets at the inlet, inside or outlet of the spinner blades through the high-speed camera, and transmitting all the pictures taken to the terminal;

[0069] S5, the terminal processes the photo using Image J software to obtain the occurrence morphology of the oil droplets at a specific position;

[0070] S6, using Ansys Fluent software to build a physical model of the swirl process of the fluid in the special-shaped quartz beaker under the action of the swirl blade, and through numerical simulation analysis, the fluid mechanics parameters affecting the breakup of the dispersed oil droplets at the specific position where the oil droplets are located in the flow field are obtained;

[0071] S7, matching the fluid mechanics parameters at the specific position with the occurrence morphology of the oil droplets at the specific position, and obtaining a matching relationship between the occurrence morphology and the fluid mechanics of the dispersed oil droplets during the swirling process;

[0072] It can be understood that the magnetic seat uses the magnetic stirrer to transform the rotating blade drive without dynamic seal, so it has a simple structure, easy operation and low energy consumption; it can also carry out rapid evaluation of the dispersed phase oil droplet breakup characteristics at different rotation speeds.

[0073] The dispersed oil phase is injected using a micro-injection pump, which can control the particle size of the injected oil droplets and inject only one oil droplet at a time, thus avoiding the problem that multiple oil droplets overlap and make it difficult for high-speed cameras to capture the deformation or breakup process of specific oil droplets;

[0074] A high-speed camera is used to capture the deformation or breakup moment of the oil droplets. A large amount of shooting data is used to obtain the distribution morphology of the dispersed phase oil droplets at different positions in the special-shaped quartz beaker. Image J is used to complete the analysis of the distribution morphology of the dispersed phase oil droplets. Then, the distribution morphology of the dispersed phase oil droplets can be quantitatively obtained, including the deformation degree, the breakup process and the particle size distribution after breakage.

[0075] Ansys Fluent software was used to build a physical model of the swirl process of the fluid in a special-shaped quartz beaker under the action of a swirling blade cascade. Numerical simulation analysis was used to obtain the fluid mechanics parameters that affect the breakup of dispersed phase oil droplets, such as velocity and turbulent kinetic energy at the point where the oil droplet morphology changes in the flow field. The fluid mechanics parameters obtained by numerical simulation and the oil droplet morphology obtained by high-speed photography were combined to complete the matching relationship between the morphology of dispersed oil droplets in the swirling process and the fluid mechanics.

[0076] The evaluation method provided in this embodiment combines high-speed photography and numerical simulation, fully considers the influence of physical parameters and hydraulic parameters on dispersed phase oil droplets, and can analyze the deformation and breakup of oil droplets, the location where the deformation and breakup occur, the distribution of sub-particles after breakage, the corresponding fluid mechanical parameters during deformation and breakage, etc., so as to determine the key factors leading to the breakup of dispersed phase oil droplets.

[0077] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0078] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0079] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0080] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0081] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0082] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0083] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0085] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A device for evaluating the morphology of dispersed oil droplets in oily wastewater during cyclone flow, characterized in that: The device comprises: Centrifugal pump, flow control valve, magnetic spinner, high-speed camera and back pressure control valve; The centrifugal pump is connected to the inlet of the magnetic swirler through a flow regulating valve, and is used to pump water in the water tank into the magnetic swirler through the flow regulating valve. The magnetic swirler is used to form a swirling flow into the fluid entering the magnetic swirler through the swirling blades arranged on its own driving shaft; The back pressure regulating valve is connected to the outlet of the magnetic swirler, and the fluid in the magnetic swirler is pumped into the sewage recovery tank through the outlet of the magnetic swirler through the centrifugal pump and the swirling flow of the fluid in the magnetic swirler through the back pressure regulating valve; The high-speed camera is arranged at one side of the magnetic spinner, and is used to capture the oil droplets at the inlet of the spinning blade grid of the magnetic spinner.

2. The device according to claim 1, characterized in that The magnetic spinner comprises: a magnetic seat, a special-shaped quartz beaker, a positioning bearing, a magnetic rotor, a micro-injector, a driving shaft, a spinner blade grid and a sewage collection pipe; The swirling blades are fixedly arranged on the top of the driving shaft in a coaxial manner, and a magnetic rotor is fixedly arranged on the bottom of the driving shaft. The magnetic rotor is driven to rotate at a preset speed by a magnetic seat, and the magnetic rotor drives the driving shaft to rotate, and the driving shaft drives the swirling blades to rotate. Through the rotation of the swirling blades, the fluid entering the magnetic swirler forms a swirling flow under the action of the swirling blades; The positioning bearing fixes the driving shaft to the bottom of the special-shaped quartz beaker and makes the driving shaft coaxial with the special-shaped quartz beaker; The inlet pipeline of the special-shaped quartz beaker is connected to the outlet of the flow regulating valve, so as to allow the water in the water tank to enter the special-shaped quartz beaker; A micro-injector is also provided at the inlet pipeline of the special-shaped quartz beaker, and dispersed oil droplets of a specific particle size are injected into the special-shaped quartz beaker through the micro-injector; The sewage collecting pipe is arranged on the top of the special-shaped quartz beaker, the sewage collecting pipe is connected to the inlet of the back pressure regulating valve, and the outlet of the back pressure regulating valve is connected to the sewage recovery tank.

3. The device according to claim 2, characterized in that A flow meter and a pressure gauge are provided between the flow regulating valve and the inlet pipeline of the special-shaped quartz beaker; The back pressure regulating valve and the flow regulating valve are adjusted, and the flow meter and the pressure gauge are coordinated to make the pressure and flow in the device meet the preset test environment requirements.

4. The device according to claim 3, characterized in that The special-shaped quartz beaker is a quartz beaker made of transparent material and has a pressure resistance of 2.0 MPa.

5. The device according to claim 4, characterized in that Also includes: A background light source is arranged on the other side of the magnetic spinner and is used to provide illumination for the interior of the magnetic spinner.

6. A method for evaluating the morphology of dispersed oil droplets in oily wastewater during cyclone flow, characterized in that: The method is based on a device for evaluating the morphology of dispersed oil droplets in oily wastewater during cyclone flow according to any one of claims 1 to 5, and the method comprises: Start the centrifugal pump to pump the water in the water tank into the special-shaped quartz beaker; adjust the flow regulating valve and the back pressure regulating valve so that the pressure and flow in the device meet the preset test environment requirements; When the flow and pressure in the device are stable, the magnetic seat is started and adjusted to a predetermined speed. The magnetic seat drives the magnetic rotor to rotate at a predetermined speed through magnetic transmission. The magnetic rotor drives the drive shaft to rotate. The drive shaft drives the swirl blades to rotate synchronously, driving the fluid entering the special-shaped quartz beaker to form a swirl flow. The volume of the dispersed oil phase to be injected is calculated according to the predetermined particle size, and the dispersed oil phase is injected into the special-shaped quartz beaker by using the micro-injection pump, thereby forming oil droplets of a specific particle size in the special-shaped quartz beaker; Starting the background light source and the high-speed camera arranged on both sides of the magnetic spinner, taking pictures of the oil droplets at the inlet, inside or outlet of the spinner blade cascade by the high-speed camera, and transmitting all the pictures taken to the terminal; The terminal uses Image J software to process the photo to obtain the occurrence morphology of the oil droplets at a specific position; The physical model of the swirl process of the fluid in the special-shaped quartz beaker under the action of the swirl blades was constructed using Ansys Fluent software. The fluid mechanics parameters affecting the breakup of dispersed oil droplets at the specific position of the oil droplet distribution in the flow field were obtained through numerical simulation analysis. The fluid mechanics parameters at a specific position are matched with the occurrence morphology of the oil droplets at the specific position to obtain the matching relationship between the occurrence morphology and fluid mechanics of the dispersed oil droplets during the swirling process.

7. The method according to claim 6, characterized in that The occurrence form of the oil droplets at the specific position includes: the deformation degree of the deformed and dispersed oil droplets, the fragmentation mode of the broken oil droplets, and the particle size distribution after fragmentation.

8. The method according to claim 7, characterized in that When the dispersed oil phase is injected into the special-shaped quartz beaker by using the micro-injection pump, only one oil droplet is injected each time to avoid overlapping of multiple oil droplets.

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