Ultrasonic-assisted oil-water separation device based on standing wave sound field and working method of ultrasonic-assisted oil-water separation device

Abstract

The invention discloses an ultrasonic-assisted oil-water separation device based on a standing wave sound field and a working method of the ultrasonic-assisted oil-water separation device. The ultrasonic-assisted oil-water separation device comprises a vibrator, a base and 2M fastening bolts, the vibrator comprises a metal matrix, four electromagnetic valves and three piezoelectric ceramic pieces; the upper end face of the metal substrate is provided with a separation groove, and the lower end face of the metal substrate is provided with a driving groove; an inflow through hole is formed in one side of the separation tank, and three outflow through holes are formed in the other side of the separation tank; three mounting grooves are formed in the driving groove; the four electromagnetic valves are arranged in the four through holes of the separating groove in a one-to-one correspondence mode, and the three piezoelectric ceramic pieces are arranged in the three mounting grooves of the driving groove in a one-to-one correspondence mode. And the vibrator is fixed on the base through 2M fastening bolts. According to the ultrasonic-assisted oil-water separation device, the sound radiation force in the standing wave sound field is utilized, micro oil drops with the size at the micron level can be driven to achieve multiple migration and convergence in the separation tank, and the purpose of ultrasonic-assisted oil-water separation is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of micro-manipulation and acoustic separation, and particularly relates to an ultrasonic auxiliary oil-water separation device based on a standing wave acoustic field and a working method thereof. BACKGROUND

[0002] A large amount of wastewater is generated in the process of oil production, and the treatment of the wastewater brings a series of problems such as environmental damage and cost increase, and the treatment of the water generated in the process of oil production becomes a problem to be solved urgently, in order to reduce the production cost and the environmental impact, the demand for downhole oil-water separation (DOWS) systems is increasing day by day in the world.

[0003] The DOWS system refers to a technology for separating oil and water in the well and simultaneously transferring water to a non-production area in the formation. The biggest goal is to pump the hydrocarbon-rich fluid to the surface, and the water-rich fluid is redirected and injected into the formation (for example, the second branch of the well or the non-hydrocarbon porous part of the reservoir), without being lifted to the surface. Therefore, the DOWS system can reduce the amount of produced water, while improving the oil-water ratio, thereby improving the production efficiency of the oil well. The acoustic separation technology is based on generating a standing wave mode in the dispersed phase of the fluid (for example, solid particles or immiscible droplets), and the time-averaged direct acoustic radiation force generated by the repeated pressure gradient drives the dispersed phase to the node or loop position within the acoustic field. One of the advantages of the acoustic separation technology is that the standing wave can be excited within the fluid through the wall of the fluid conduit without interfering with the flow. Another advantage is that the acoustic parameters (amplitude and frequency) can be changed instantaneously to adjust the characteristics of the standing wave to adapt to changes in oil well conditions. In addition, the technology and components required to establish the acoustic separation system are easily available, and the system can be quickly improved and adapted to various applications involving harsh conditions, such as in oil production wells and oil pipelines. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an ultrasonic auxiliary oil-water separation device based on a standing wave acoustic field and a working method thereof, which solves the defects involved in the background art.

[0005] The present application adopts the following technical solutions to solve the above technical problems: An ultrasonic auxiliary oil-water separation device based on a standing wave acoustic field, comprising a vibrator, a base and 2M fastening bolts, M being a natural number greater than or equal to 2; The vibrator comprises a metal base, first to fourth electromagnetic valves, and first to third piezoelectric ceramic sheets. The metal base is a cuboid, comprising an upper end face, a lower end face, and first to fourth side walls connected vertically in sequence; The upper end surface of the metal base is provided with a cuboid separation groove, the first to fourth side walls of the separation groove are respectively parallel to the first to fourth side walls of the metal base one by one in a one-to-one correspondence, and the separation groove and the metal base are coaxial; The lower end surface of the metal base is provided with a driving groove penetrating the first and third side walls of the metal base; the two side walls of the driving groove are respectively parallel to the second and fourth side walls of the metal base, and the driving groove and the metal base are coaxial; The metal base is provided with first to third mounting grooves penetrating the first and third side walls of the metal base on the bottom wall of the driving groove; the first to third mounting grooves are all rectangular grooves, and are uniformly and equidistantly arranged in the direction of the first side wall of the metal base in the driving groove, wherein the second mounting groove corresponds to the anti-node position of the first-order face bending vibration mode of the vibrator in the direction of the first side wall and the intermediate anti-node position of the third-order face bending vibration mode of the vibrator in the direction of the first side wall; the first and third mounting grooves correspond to the two anti-node positions of the second-order face bending vibration mode of the vibrator in the direction of the first side wall, respectively; The metal base is provided with M threaded blind holes on the lower end surface of the metal base on both sides of the driving groove in the direction of the second side wall of the metal base, so that the lower end surface of the metal base is provided with 2M threaded blind holes; The metal base is provided with a first through hole parallel to the upper end surface at the center of the first side wall of the separation groove and a second through hole parallel to the upper end surface at the center of the third side wall of the separation groove; the metal base is symmetrically provided with a third through hole and a fourth through hole on both sides of the second through hole, wherein the first through hole and the second through hole are coaxial, the second to fourth through holes are coplanar and the plane is parallel to the upper end surface of the metal base, the first mounting groove is symmetric about the axis passing through the third through hole and perpendicular to the plane of the upper end surface of the metal base, the second mounting groove is symmetric about the axis passing through the second through hole and perpendicular to the plane of the upper end surface of the metal base, and the third mounting groove is symmetric about the axis passing through the fourth through hole and perpendicular to the plane of the upper end surface of the metal base; The first to fourth electromagnetic valves are respectively arranged in the first to fourth through holes one by one for controlling the on-off of the through hole; The first to third piezoelectric ceramic sheets have the same structure and are polarized in the thickness direction and are arranged in the first to third mounting grooves one by one, wherein the thickness of the first piezoelectric ceramic sheet is greater than the depth of the first mounting groove, the polarization direction of the first piezoelectric ceramic sheet is from the upper end surface of the metal base to the lower end surface of the metal base, the polarization directions of the second and third piezoelectric ceramic sheets are opposite to that of the first piezoelectric ceramic sheet, the second piezoelectric ceramic sheet is used to excite the first-order face bending vibration or the third-order face bending vibration of the vibrator in the direction of the first side wall, and the first and third piezoelectric ceramic sheets are used to excite the second-order face bending vibration of the vibrator in the direction of the first side wall; The base is a rectangular plate, and a bottom end surface of the base is provided with 2M countersunk through holes corresponding to 2M threaded blind holes of a bottom end surface of the metal base; the 2M fastening bolts are respectively threaded through the 2M countersunk through holes of the bottom end surface of the base and are threadedly connected to the 2M threaded blind holes in a one-to-one correspondence, so as to fix the vibrator on the base; and the base is further provided with through holes for being fixed to the outside at four corners of the base.

[0006] As a further optimization scheme of the ultrasonic-assisted oil-water separation device based on a standing wave acoustic field, the device further comprises a cover plate. The cover plate is made of transparent material and is fixed to an upper end surface of the vibrator to close and penetrate the separation tank. The cover plate is provided with a vent hole for connecting the separation tank to the outside.

[0007] As a further optimization scheme of the ultrasonic-assisted oil-water separation device based on a standing wave acoustic field, the cover plate is made of transparent quartz glass.

[0008] As a further optimization scheme of the ultrasonic-assisted oil-water separation device based on a standing wave acoustic field, M is 4.

[0009] The application further discloses a working method of the ultrasonic-assisted oil-water separation device based on a standing wave acoustic field, comprising the following steps. Step 1), the first electromagnetic valve is opened, and the second to fourth electromagnetic valves are closed, so that the oil-in-water mixed emulsion flows into the separation tank through the first channel; Step 2), the first electromagnetic valve is closed, a preset first simple harmonic voltage signal is applied to the second piezoelectric ceramic sheet, a third-order out-of-plane bending mode of the vibrator in the first side wall direction is excited, a standing wave acoustic field with three wave nodes is coupled out, and the micro oil droplets in the oil-in-water mixed emulsion in the separation tank move to the nearest wave node position under the action of acoustic radiation force; Step 3), the driving of the second piezoelectric ceramic sheet is stopped, a preset second simple harmonic voltage signal is applied to the first and third piezoelectric ceramic sheets, a second-order out-of-plane bending mode of the vibrator in the first side wall direction is excited, a standing wave acoustic field with two wave nodes is coupled out, and the oil droplets in the oil-in-water mixed emulsion in the separation tank move to two new wave node positions under the action of acoustic radiation force; Step 4), the driving of the first and third piezoelectric ceramic sheets is stopped, a preset third simple harmonic voltage signal is applied to the second piezoelectric ceramic sheet, a first-order out-of-plane bending mode of the vibrator in the first side wall direction is excited, a standing wave acoustic field with one wave node is coupled out, and the oil droplets in the oil-in-water mixed emulsion in the separation tank move to a new wave node position under the action of acoustic radiation force; Step 5), the driving of the second piezoelectric ceramic sheet is stopped, and the second to fourth piezoelectric ceramic sheets are opened, so that the high-oil-ratio mixed emulsion flows out from the second through hole, and the low-oil-ratio mixed emulsion flows out from the third and fourth through holes.

[0010] Compared with the prior art, the present application has the following technical effects: 1. The device is simple and cheap, and can reduce the cost of common screening systems; 2. The standing wave field is excited in the fluid by the vibration of the vibrator, and the non-contact control of the dispersed phase is realized by using the unique mechanical properties of the standing wave field without interfering with the flow; 3. The acoustic parameters can be quickly switched to adjust the characteristics of the standing wave in real time; 4. It can adapt to various applications involving harsh conditions, such as applications in oil production wells and oil pipelines. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a structural schematic diagram of the metal base of the vibrator in the present application; Figure 3 is a structural schematic diagram of the lower end surface of the vibrator in the present application; Figure 4 is a side view schematic diagram of the vibrator in the present application; Figure 5 is a schematic diagram of the motion of the suspended oil droplets caused by the standing wave field mode switching sequence and the change of the wave crest coupled out by the vibrator in the present application; Figure 6 is a schematic diagram of the oil-in-water mixed emulsion discharged from the rectangular flow channel of the vibrator after ultrasonic treatment in the present application.

[0012] In the figure, 1 is a cover plate, 2 is a vibrator, 3 is a base, 4 is a separation groove, 5 is a first through hole, 6 is a second through hole, 7 is a third through hole, 8 is a fourth through hole, 9 is a first mounting groove, 10 is a second mounting groove, 11 is a third mounting groove, 12 is a threaded blind hole, 13 is a first piezoelectric ceramic sheet, 14 is a second piezoelectric ceramic sheet, and 15 is a third piezoelectric ceramic sheet. DETAILED DESCRIPTION

[0013] The technical solutions of the present application will be further described in detail below in combination with the drawings: The present application can be implemented in many different forms, and should not be considered limited to the embodiments described herein. On the contrary, these embodiments are provided to make the present disclosure thorough and complete, and to fully convey the scope of the present application to those skilled in the art. In the drawings, the components are enlarged for clarity.

[0014] It should be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, and / or parts, these elements, components, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, and / or part from another. Therefore, a first element, component, and / or part discussed below could be termed a second element, component, or part without departing from the teachings of the present application.

[0015] As shown in Figure 1 The application discloses an ultrasonic-assisted oil-water separation device based on a standing wave acoustic field, which comprises a cover plate, a vibrator, a base and 2M fastening bolts, M being a natural number greater than or equal to 2. The vibrator comprises a metal base, first to fourth electromagnetic valves and first to third piezoelectric ceramic sheets. As shown in Figure 2 The metal base is a cuboid, comprising an upper end face, a lower end face and first to fourth side walls which are vertically and sequentially fixed in order. The upper end face of the metal base is provided with a separation groove in the shape of a cuboid, the first to fourth side walls of the separation groove are parallel to the first to fourth side walls of the metal base in one-to-one correspondence respectively, and the separation groove is coaxial with the metal base. The lower end face of the metal base is provided with a driving groove penetrating through the first and third side walls of the metal base; the two side walls of the driving groove are parallel to the second and fourth side walls of the metal base respectively, and the driving groove is coaxial with the metal base. The metal base is provided with first to third mounting grooves penetrating through the first and third side walls of the metal base on the bottom wall of the driving groove; the first to third mounting grooves are all rectangular recesses, which are uniformly and equidistantly arranged along the direction of the first side wall of the metal base in the driving groove, wherein the second mounting groove corresponds to the antinode position of a first-order face-out-of-plane bending mode of the vibrator in the direction of the first side wall and the intermediate antinode position of a third-order face-out-of-plane bending mode of the vibrator in the direction of the first side wall; the first and third mounting grooves correspond to two antinode positions of a second-order face-out-of-plane bending mode of the vibrator in the direction of the first side wall respectively. As shown in Figure 3 The metal base is provided with M threaded blind holes on the lower end face on the two sides of the driving groove along the direction of the second side wall of the metal base, and the lower end face of the metal base is provided with 2M threaded blind holes in total. The metal base is provided with a first through hole parallel to the upper end face thereof at the center of the first side wall of the separation groove and a second through hole parallel to the upper end face thereof at the center of the third side wall of the separation groove; the metal base is symmetrically provided with a third through hole and a fourth through hole on both sides of the second through hole, wherein the first through hole and the second through hole are coaxial, the second through hole to the fourth through hole are coplanar and the plane is parallel to the upper end face of the metal base, the first mounting groove is symmetric about the axis passing through the third through hole and perpendicular to the plane of the upper end face of the metal base, the second mounting groove is symmetric about the axis passing through the second through hole and perpendicular to the plane of the upper end face of the metal base, and the third mounting groove is symmetric about the axis passing through the fourth through hole and perpendicular to the plane of the upper end face of the metal base; The first to fourth electromagnetic valves are respectively and correspondingly arranged in the first to fourth through holes for controlling the on-off of the through hole; The first to third piezoelectric ceramic sheets are of the same structure and are polarized along the thickness direction and are correspondingly arranged in the first to third mounting grooves, as shown in Figure 3 、 Figure 4 The thickness of the first piezoelectric ceramic sheet is greater than the depth of the first mounting groove, the polarization direction of the first piezoelectric ceramic sheet is from the upper end face of the metal base to the lower end face of the metal base, the polarization directions of the second piezoelectric ceramic sheet and the third piezoelectric ceramic sheet are opposite to that of the first piezoelectric ceramic sheet, the second piezoelectric ceramic sheet is used to excite the first-order out-of-plane bending vibration or the third-order out-of-plane bending vibration of the vibrator in the direction of the first side wall, and the first piezoelectric ceramic sheet and the third piezoelectric ceramic sheet are used to excite the second-order out-of-plane bending vibration of the vibrator in the direction of the first side wall; The base is a rectangular plate, the lower end face thereof is provided with 2M countersunk through holes corresponding to the 2M threaded blind holes of the lower end face of the metal base, the 2M fastening bolts are respectively threaded through the 2M countersunk through holes of the lower end face of the base and are threadedly connected to the 2M threaded blind holes to fix the vibrator on the base, and the four corners of the base are further respectively provided with through holes for being fixed to the outside; The cover plate is made of transparent material and is fixed to the upper end face of the vibrator for closing and penetrating the separation groove; The cover plate is provided with a vent hole for connecting the separation groove with the outside.

[0016] The cover plate is preferably made of transparent quartz glass, and M is preferably 4.

[0017] The application aims to provide a method for separating oil from water in an oil-in-water mixed emulsion driven by a standing wave acoustic field, utilizing the acoustic radiation force in the standing wave acoustic field to drive the micron-sized micro oil droplets to migrate and converge in the flow channel multiple times, so that the size of the oil droplets is increased after ultrasonic treatment, and the efficiency of subsequent oil-water separation can be improved. After treatment, the spatial distribution of the dispersed phase oil droplets in the flow channel becomes uneven, and the oil content in the oil-in-water emulsion in the middle of the flow channel is high, which is discharged through the second through hole; the oil content in the oil-in-water emulsion in the two side regions is reduced after ultrasonic treatment, which is discharged through the third and fourth through holes, so as to realize the purpose of ultrasonic-assisted oil-water separation.

[0018] The specific control process of the micro control device is as follows, and the whole process is as shown in Figure 5 Step 1), open the first electromagnetic valve, close the second to fourth electromagnetic valves, so that the oil-in-water mixed emulsion flows into the separation tank through the first channel; Step 2), close the first electromagnetic valve, apply a preset first harmonic voltage signal U 1 Sin (ω 1 t) to the second piezoelectric ceramic sheet to excite the vibrator to generate a third-order out-of-plane bending mode in the direction of the first side wall, couple out a standing wave field with three wave crests, so that the micro oil droplets in the oil-in-water mixed emulsion in the separation tank move to the nearest wave crest position under the action of the acoustic radiation force, as shown in Figure 5 t1 section; Step 3), stop driving the second piezoelectric ceramic sheet, and apply a preset second harmonic voltage signal U 2 Sin(ω 2 t) to the first and third piezoelectric ceramic sheets to excite the vibrator to generate a second-order out-of-plane bending mode in the direction of the first side wall, couple out a standing wave field with two wave crests, so that the oil droplets in the oil-in-water mixed emulsion in the separation tank move to two new wave crest positions under the action of the acoustic radiation force, as shown in Figure 5 t2 section; Step 4), stop driving the first and third piezoelectric ceramic sheets, and apply a preset third harmonic voltage signal U 3 Sin(ω 3 t) to the second piezoelectric ceramic sheet to excite the vibrator to generate a first-order out-of-plane bending mode in the direction of the first side wall, couple out a standing wave field with one wave crest, so that the oil droplets in the oil-in-water mixed emulsion in the separation tank move to a new wave crest position under the action of the acoustic radiation force, as shown in Figure 5 t3 section; ​Step 5), stop driving the second piezoelectric ceramic sheet, open the second to fourth piezoelectric ceramic sheets, so that the high oil ratio mixed emulsion flows out from the second through hole, and the low oil ratio mixed emulsion flows out from the third and fourth through holes, as shown in Figure 6

[0019] The discharged high oil ratio mixed emulsion can be used as raw material for further extracting oil liquid, and the low oil ratio mixed emulsion can continue to be treated by ultrasonic treatment for oil-water separation.

[0020] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless otherwise defined.

[0021] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.​

Claims

1. An ultrasonic-assisted oil-water separation device based on a standing wave acoustic field, characterized in that, Includes an oscillator, a base, and 2M fastening bolts, where M is a natural number greater than or equal to 2; The oscillator includes a metal substrate, first to fourth solenoid valves, and first to third piezoelectric ceramic sheets; The metal substrate is a cuboid, comprising an upper end face, a lower end face, and first to fourth side walls that are vertically connected end to end. The upper surface of the metal substrate is provided with a cuboid separation groove. The first to fourth sidewalls of the separation groove are parallel to the first to fourth sidewalls of the metal substrate, and the separation groove and the metal substrate are coaxial. The lower end face of the metal substrate is provided with a driving groove that penetrates the first and third sidewalls of the metal substrate; the two sidewalls of the driving groove are parallel to the second and fourth sidewalls of the metal substrate, respectively, and the driving groove and the metal substrate are coaxial. The metal substrate has first to third mounting grooves on the bottom wall of the drive groove, penetrating the first and third sidewalls of the metal substrate; the first to third mounting grooves are all rectangular grooves, which are evenly and equidistantly arranged in the drive groove along the direction of the first sidewall of the metal substrate. The second mounting groove corresponds to the antinode position of the first out-of-plane bending vibration mode of the oscillator in the direction of the first sidewall and the middle antinode position of the third out-of-plane bending vibration mode of the oscillator in the direction of the first sidewall; the first and third mounting grooves correspond to the two antinode positions of the second out-of-plane bending vibration mode of the oscillator in the direction of the first sidewall, respectively. The metal substrate has M threaded blind holes evenly spaced along the direction of the second sidewall of the metal substrate on the lower end face of both sides of the drive groove, so the lower end face of the metal substrate has a total of 2M threaded blind holes. The metal substrate has a first through hole parallel to its upper end face at the center of the first side wall of the separation groove, and a second through hole parallel to its upper end face at the center of the third side wall of the separation groove; the metal substrate has a third through hole and a fourth through hole symmetrically arranged on both sides of the second through hole, wherein the first through hole and the second through hole are coaxial, the second to fourth through holes are coplanar and the plane is parallel to the upper end face of the metal substrate, the first mounting groove is symmetrical about the plane passing through the third through hole and perpendicular to the upper end face of the metal substrate, the second mounting groove is symmetrical about the plane passing through the second through hole and perpendicular to the upper end face of the metal substrate, and the third mounting groove is symmetrical about the plane passing through the fourth through hole and perpendicular to the upper end face of the metal substrate; The first to fourth solenoid valves are respectively installed in the first to fourth through holes to control the opening and closing of their respective through holes; The first to third piezoelectric ceramic sheets have the same structure and are polarized along the thickness direction. They are arranged in the first to third mounting grooves in a one-to-one correspondence. The thickness of the first piezoelectric ceramic sheet is greater than the depth of the first mounting groove. The polarization direction of the first piezoelectric ceramic sheet is from the upper end face of the metal substrate to the lower end face of the metal substrate. The polarization directions of the second and third piezoelectric ceramic sheets are opposite to those of the first piezoelectric ceramic sheet. The second piezoelectric ceramic sheet is used to excite the oscillator to generate a first-order out-of-plane bending vibration or a third-order out-of-plane bending vibration in the first sidewall direction. The first and third piezoelectric ceramic sheets are used to excite the oscillator to generate a second-order out-of-plane bending vibration in the first sidewall direction. The base is a rectangular plate with 2M countersunk through holes on its lower end face that correspond one-to-one with the 2M threaded blind holes on the lower end face of the metal substrate. The 2M fastening bolts pass through the 2M countersunk through holes on the lower end face of the base and are threadedly connected to the 2M threaded blind holes to fix the vibrator on the base. The four corners of the base are also provided with through holes for connection with the outside.

2. The ultrasonic-assisted oil-water separation device based on standing wave acoustic field according to claim 1, characterized in that, It also includes a cover plate; The cover plate is made of transparent material and is fixedly connected to the upper end face of the vibrator to close and penetrate the separation groove. The cover plate is provided with ventilation holes for connecting the separation tank to the outside.

3. The ultrasonic-assisted oil-water separation device based on standing wave acoustic field according to claim 2, characterized in that, The cover plate is made of transparent quartz glass.

4. The ultrasonic-assisted oil-water separation device based on standing wave acoustic field according to claim 1, characterized in that, M is set to 4.

5. The working method of the ultrasonic-assisted oil-water separation device based on standing wave acoustic field as described in claim 1, characterized in that, Includes the following steps: Step 1), open the first solenoid valve and close the second to fourth solenoid valves, so that the water-in-oil emulsion flows into the separation tank through the first channel; Step 2), close the first solenoid valve, apply a preset first simple harmonic voltage signal to the second piezoelectric ceramic sheet, excite the oscillator to generate a third-order out-of-plane bending vibration mode in the direction of the first side wall, and couple out a standing wave sound field with three antinodes, so that the tiny oil droplets in the water-in-oil emulsion in the separation tank move to the nearest antinode under the action of acoustic radiation force. Step 3), stop driving the second piezoelectric ceramic sheet, apply a preset second simple harmonic voltage signal to the first and third piezoelectric ceramic sheets, excite the oscillator to generate a second-order out-of-plane bending vibration mode in the direction of the first side wall, and couple out a standing wave sound field with two antinodes, so that the oil droplets in the water-in-oil emulsion in the separation tank move to two new antinode positions under the action of acoustic radiation force. Step 4) Stop driving the first and third piezoelectric ceramic sheets, apply a preset third harmonic voltage signal to the second piezoelectric ceramic sheet, excite the oscillator to generate a first-order out-of-plane bending vibration mode in the direction of the first side wall, and couple out a standing wave sound field with an antinode, so that the oil droplets in the water-in-oil emulsion in the separation tank move to the new antinode position under the action of acoustic radiation force. Step 5), stop driving the second piezoelectric ceramic sheet, open the second to fourth piezoelectric ceramic sheets, so that the high oil content mixed emulsion flows out from the second through hole, and the low oil content mixed emulsion flows out from the third and fourth through holes.

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