An ultrasonic-assisted oil-water separation device based on standing wave acoustic field and a working method thereof

Abstract

The application discloses an ultrasonic-assisted oil-water separation device based on a standing wave sound field and a working method thereof. The ultrasonic-assisted oil-water separation device comprises a vibrator, a base and 2M fastening bolts. The vibrator comprises a metal base body, four electromagnetic valves and three piezoelectric ceramic sheets. The metal base body is a cuboid, and a separation groove is arranged on the upper end face, and a driving groove is arranged on the lower end face. One inflow through hole is arranged on one side of the separation groove, and three outflow through holes are arranged on the other side of the separation groove. Three installation grooves are arranged in the driving groove. The four electromagnetic valves are arranged in the four through holes of the separation groove one by one, and the three piezoelectric ceramic sheets are arranged in the three installation grooves of the driving groove one by one. The vibrator is fixed on the base through the 2M fastening bolts. The ultrasonic-assisted oil-water separation device can drive the micro oil droplets with the size of microns to realize multiple migration and convergence in the separation groove by using the acoustic radiation force in the standing wave sound field, and the purpose of ultrasonic-assisted oil-water separation is achieved.

Description

Technical Field

[0001] This invention relates to the fields of micro-manipulation and acoustic separation technology, and in particular to an ultrasonic-assisted oil-water separation device based on a standing wave sound field and its working method. Background Technology

[0002] Oil production processes generate large amounts of wastewater, and the treatment of this wastewater has led to a series of problems such as environmental damage and increased costs. Treating the water generated during oil production has become an urgent issue to be addressed. In order to reduce production costs and environmental impact, the demand for downhole oil-water separation (DOWS) systems is increasing worldwide.

[0003] DOWS (Depth-of-Water) systems refer to technologies that separate oil and water downhole while simultaneously transferring water to non-producing areas within the formation. The primary goal is to pump hydrocarbon-rich fluids to the surface, while water-rich fluids are redirected and injected into the formation (e.g., a second branch of the well or a non-hydrocarbon-bearing porous portion of the reservoir) without needing to be pumped to the surface. Therefore, DOWS systems can reduce produced water while increasing the oil-water ratio, thereby improving well productivity. Acoustic separation technology is based on generating standing wave patterns in the dispersed phase of a fluid (e.g., solid particles or immiscible droplets). The time-averaged direct acoustic radiation force generated by a repetitive pressure gradient drives the dispersed phase to nodes or antinodes within the acoustic field. One advantage of acoustic separation technology is that standing waves can be generated within the fluid through the conduit wall without interfering with the flow. Another advantage is that acoustic parameters (amplitude and frequency) can be changed instantaneously to adjust the characteristics of the standing waves to adapt to varying well conditions. Furthermore, the technologies and components required to establish acoustic separation systems are readily available, and the systems can be rapidly modified and adapted to various applications involving harsh conditions, such as those in producing wells and pipelines. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the deficiencies mentioned in the background art by providing an ultrasonic-assisted oil-water separation device based on a standing wave sound field and its working method.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An ultrasonic-assisted oil-water separation device based on a standing wave sound field 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 direction of the first sidewall. 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 direction of the first sidewall. 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.

[0006] As a further optimization of the ultrasonic-assisted oil-water separation device based on standing wave sound field of the present invention, 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.

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

[0008] As a further optimization of the ultrasonic-assisted oil-water separation device based on standing wave sound field of the present invention, M is set to 4.

[0009] The present invention also discloses a method for operating the ultrasonic-assisted oil-water separation device based on standing wave sound field, comprising 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 through hole; Step 2), close the first solenoid valve, apply a preset first 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 towards 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 simple 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 solenoid valves, 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.

[0010] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects: 1. The equipment is simple and inexpensive, which can reduce the cost of common screening systems; 2. By vibrating the oscillator, a standing wave sound field is generated in the fluid. The unique mechanical properties of the standing wave sound field are used to achieve non-contact control of the dispersed phase without interfering with the flow. 3. Acoustic parameters can be switched quickly 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 wells and oil pipelines. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the metal substrate of the oscillator in this invention; Figure 3 This is a schematic diagram of the structure of the lower end face of the oscillator in this invention; Figure 4 This is a side view of the oscillator in this invention; Figure 5 This is a schematic diagram of the switching sequence of the standing wave acoustic field modes coupled by the oscillator vibration and the motion of the suspended oil droplets caused by the changes in the antinodes in this invention; Figure 6 This is a schematic diagram of the rectangular flow channel through which the water-in-oil emulsion after ultrasonic treatment is discharged from the oscillator in this invention.

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

[0013] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings: This invention can be implemented in many different forms and should not be considered limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully express the scope of the invention to those skilled in the art. In the drawings, components are enlarged for clarity.

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

[0015] like Figure 1 As shown, this invention discloses an ultrasonic-assisted oil-water separation device based on a standing wave sound field, comprising a cover plate, a vibrator, 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; like Figure 2 As shown, the metal substrate is a cuboid, including an upper end face, a lower end face, and first to fourth side walls that are vertically fixed end to end in sequence. 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. like Figure 3 As shown, 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, are all polarized along the thickness direction, and are arranged one-to-one in the first to third mounting grooves, such as... Figure 3 , Figure 4 As shown, 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 points 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 direction of the first sidewall. 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 direction of the first sidewall. 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. 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.

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

[0017] This invention aims to provide an oil-water separation method for water-in-oil emulsions driven by a standing wave acoustic field. Utilizing the acoustic radiation force in the standing wave acoustic field, it drives micron-sized oil droplets to migrate and converge multiple times within a flow channel. After ultrasonic treatment, the spatial position of the oil droplets in the flow channel changes, and their size also increases due to fusion, thereby improving the efficiency of subsequent oil-water separation. In the treated water-in-oil emulsion, the spatial distribution of dispersed phase oil droplets in the flow channel becomes non-uniform. The oil content in the water-in-oil emulsion located in the middle of the flow channel is higher and is discharged through the second through-hole; the oil content in the water-in-oil emulsion located in the lateral regions decreases after ultrasonic treatment and is discharged through the third and fourth through-holes, achieving the purpose of ultrasonic-assisted oil-water separation.

[0018] The specific operation process of the micro-control device is as follows: the entire process is as follows. Figure 5 As shown: 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 through hole; Step 2), close the first solenoid valve and apply a preset first harmonic voltage signal to the second piezoelectric ceramic sheet. U 1 Sin (ω 1 t) The excitation oscillator generates a third-order out-of-plane bending vibration mode in the direction of the first sidewall, coupling out a standing wave acoustic field with three antinodes. This causes the tiny oil droplets in the oil-in-water emulsion in the separation tank to move towards the nearest antinode under the action of acoustic radiation force, such as... Figure 5 As shown in segment t1; Step 3): Stop driving the second piezoelectric ceramic sheet and apply a preset second harmonic voltage signal to the first and third piezoelectric ceramic sheets. U 2 Sin(ω 2 t) The excitation oscillator generates a second-order out-of-plane bending vibration mode in the direction of the first sidewall, coupling out a standing wave acoustic field with two antinodes. This causes the oil droplets in the oil-in-water emulsion in the separation tank to move to the two new antinode positions under the action of acoustic radiation force, such as... Figure 5 As shown in segment t2; Step 4): Stop driving the first and third piezoelectric ceramic sheets, and apply a preset third harmonic voltage signal to the second piezoelectric ceramic sheet. U 3 Sin(ω 3 t) The excitation oscillator generates a first-order out-of-plane bending vibration mode in the direction of the first sidewall, coupling out a standing wave acoustic field with an antinode. This causes the oil droplets in the oil-in-water emulsion in the separation tank to move to the new antinode position under the action of acoustic radiation force, such as... Figure 5 As shown in segment t3; Step 5), stop driving the second piezoelectric ceramic sheet, open the second to fourth solenoid valves, allowing the high oil content mixed emulsion to flow out from the second through-hole, and the low oil content mixed emulsion to flow out from the third and fourth through-holes, as shown. Figure 6 As shown.

[0019] The high-oil-content mixed emulsion can be used as a raw material for further oil extraction, while the low-oil-content mixed emulsion can be used for ultrasonic treatment to separate oil and water.

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

[0021] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

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 direction of the first sidewall. 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 direction of the first sidewall. 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 through hole; Step 2), close the first solenoid valve, apply a preset first 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 towards 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 simple 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 solenoid valves, 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.

Images