Liquid-liquid separation drum, separation device and separation method

Abstract

The invention belongs to the technical field of liquid-liquid separation, and discloses a liquid-liquid separation drum, a separation device and a separation method.The drum body of the drum is divided into a top drum, a middle drum and a bottom drum, the lower portion of the bottom wall is coaxially connected with a suction pipe, the center of the top wall is provided with a round heavy phase outlet, and the top drum is provided with a light phase outlet and a heavy phase outlet; each of the middle cylinder and the bottom cylinder is provided with an inner pipe and a peripheral wall, a plurality of vertical radial plates are arranged between the inner pipes and the peripheral walls, the rotating cylinder is divided into a plurality of independent centrifugal chambers, a plurality of liquid inlets are formed in the bottom wall, and each centrifugal chamber corresponds to at least one liquid inlet. The liquid-liquid separation drum is divided into three sections, the upper drum is responsible for separation and export, the interior of the middle drum and the interior of the bottom drum are divided into a plurality of vertical centrifugal chambers through the radial plates, mixed liquid entering the centrifugal chambers can be pushed by the radial plates to rapidly reach the highest centrifugal rotating speed, and the separation working efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid-liquid separation, and in particular relates to a liquid-liquid separation drum, a separation device and a separation method. Background Art

[0002] Liquid-liquid separation devices or centrifugal extractors usually use the centrifugal force generated by high-speed rotation to achieve efficient liquid-liquid separation. The working process includes two processes: liquid mixing and mass transfer and two-phase separation. The ultra-high speed of the drum in the separation device makes the centrifugal force larger, so it is suitable for processing materials with small density difference between the two phases, high viscosity, and easy emulsification. It also has the advantages of high mass transfer efficiency, small retention volume, and small equipment size. It has been widely used in petroleum refining, chemical, pharmaceutical, food, military and other industries.

[0003] The annular gap centrifugal extractor is mainly composed of four parts: transmission part, drum, shell and body. The annular space between the outer wall of the drum and the inner wall of the shell is the mixing chamber. The space inside the drum is the separation chamber. When the two-phase liquid enters the mixing chamber, it is fully mixed under the drive of the high-speed rotating drum, thereby ensuring the mass transfer efficiency. The mixed phase is then sent into the drum separation chamber by the turbine baffle at the bottom of the shell, which converts the kinetic energy of the rotating liquid into potential energy. Under the action of strong centrifugal force, it is quickly separated into light and heavy phases. The heavy phase moves upward along the drum wall on the outside, and the light phase flows upward along the center tube on the inside, and is discharged from the light and heavy phase outlets respectively. At this point, the two processes of two-phase mixing and separation are completed, achieving the purpose of extraction and two-phase separation.

[0004] The Chinese invention patent with publication number CN118236724A discloses a centrifugal extractor and a centrifugal extraction system, which improves the structure of the traditional equipment. Liquids are mixed through a mixing channel between the outer shell and the drum, so that the mixed liquid can be separated more effectively after entering the drum; by arranging a magnetic bearing above the drum for driving, the bearing capacity is effectively increased, the operating stability and efficiency of the equipment are improved, and the friction during operation of the traditional mechanical bearing is reduced; and by installing the magnetic bearing in the space inside the shell, the sealing of the equipment is improved; the defects of the centrifugal extractor in the prior art, such as large size, poor sealing, and easy damage of the equipment, are overcome.

[0005] The above scheme adopts a means to effectively drive the mixed liquid in the drum / cylinder to accelerate the rotation by setting stirring blades on the central shaft. However, the mixed liquid entering the high-speed drum will adhere to the inner wall of the drum after rotation, and the driving effect of the central stirring blade is limited. Summary of the invention

[0006] In order to overcome the above technical problems, the present invention provides a liquid-liquid separation drum, a separation device and a separation method, and designs the drum into chambers to effectively ensure that the mixed liquid is quickly accelerated after entering the drum, thereby improving production efficiency.

[0007] The present invention adopts the following technical solutions: The liquid-liquid separation rotating cylinder comprises a cylinder body and a rotating shaft in the center. The cylinder body is divided into a top cylinder, a middle cylinder and a bottom cylinder. A sealing gasket is placed between adjacent cylinders. The bottom cylinder has a bottom wall. A suction pipe is coaxially connected below the bottom wall. A liquid extraction fan blade is fixedly connected inside the suction pipe. The top cylinder has a top wall. A circular heavy phase outlet is opened in the center of the top wall. A horizontal separation plate is arranged inside the top cylinder. A light phase groove is arranged near the center of the bottom surface of the separation plate. A light phase outlet is opened outside the top cylinder on the groove wall of the light phase groove. A heavy phase hole is arranged between the outer periphery of the separation plate and the outer periphery inner wall of the top cylinder. A cavity is arranged between the separation plate and the top plate. The heavy phase hole connects the cavity with the middle cylinder. Both the middle tube and the bottom tube have an inner tube and an outer peripheral wall. The inner tube is sleeved on the rotating shaft. A plurality of vertical spokes are arranged in a circumferential array between the inner tube and the outer peripheral wall. Two adjacent spokes, the inner tube and the outer peripheral wall form an independent centrifugal chamber. A plurality of liquid inlets are arranged on the bottom wall, and each centrifugal chamber corresponds to at least one liquid inlet.

[0008] Preferably, the lower half of the suction tube is a vertical circular tube, the tube wall of the upper half expands outwardly into a funnel shape, and the liquid inlet is close to the top tube wall of the suction tube.

[0009] Preferably, the rotating shaft is also provided with a porcelain sleeve having negative pressure fan blades.

[0010] Preferably, an interface adjustment ring is concentrically connected to the top of the top wall, and the inner diameter of the interface adjustment ring is not larger than the heavy phase outlet.

[0011] The invention also discloses a liquid-liquid separation device, comprising a shell, wherein the liquid-liquid separation drum is arranged inside the shell.

[0012] Preferably, the outer shell is coaxial with the cylinder body, and an axle seat connected to the rotating shaft is arranged above the outer shell. The axle seat is equipped with a motor, and the motor drives the connecting rotating shaft. An upper ring plate and a lower ring plate are fixedly arranged on the inner wall of the outer shell, and the inner circles of the upper ring plate and the lower ring plate are higher than the outer circles. The inner circle of the upper ring plate is located between the top wall and the light phase outlet, and the inner circle of the lower ring plate is lower than the light phase outlet. The space inside the shell above the upper ring plate is the heavy phase guide space, and the space between the lower ring plate and the upper ring plate is the light phase guide space. The outer shell has a heavy phase separation port and a light phase separation port corresponding to the heavy phase guide space and the light phase guide space.

[0013] Preferably, a feed port is provided on the middle and lower shell wall of the shell, and a circle of horizontal mesh ring plates is fixedly connected to the inner wall of the shell below the feed port, and the inner circle of the mesh ring plates is upwardly connected to the blocking cylinder.

[0014] Preferably, the inner bottom of the shell is a labyrinth mixing chamber, in which a plurality of intermittent vertical blocking plates are arranged, a material drop opening is opened at the center of the bottom wall of the labyrinth mixing chamber, the bottom center of the shell is connected to the material collection chamber, and a suction pipe extends into the material collection chamber through the material drop opening.

[0015] Preferably, an exhaust passage is provided at the top center of the housing.

[0016] A liquid-liquid separation method, using the above-mentioned liquid-liquid separation device, comprises the following steps: S1. After the device is started, the motor drives the shaft to rotate through the belt, driving the drum to rotate; S2. The mixed liquid raw material injected from the feed port falls through the mesh ring plate and is broken up for the first time. When passing through the maze mixing chamber, it is blocked by the vertical plate and broken up for the second time. The two times of breaking up improve the uniformity of the mixed liquid. After the two times of breaking up, the mixed liquid enters the aggregate chamber; S3. The liquid pumping blades in the suction pipe rotate at high speed to extract the mixed liquid from the collecting chamber and transport it upward. The mixed liquid begins to diffuse outward in the upper half of the suction pipe and enters the centrifugal chamber from the liquid inlet. The mixed liquid entering the centrifugal chamber quickly reaches the highest speed under the push of the radial plate and begins to stratify; S4. The heavy phase moves up through the heavy phase hole and is separated from the heavy phase outlet, and flows out from the heavy phase separation outlet through the heavy phase guide space. The light phase is separated through the light phase groove and the light phase outlet, and flows out from the light phase separation outlet through the light phase guide space, completing the separation.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The liquid-liquid separation drum of the present invention is divided into three sections: the top drum, the middle drum and the bottom drum. The top drum is responsible for separation and derivation. The interiors of the middle drum and the bottom drum are divided into multiple vertical centrifugal chambers by spokes. The mixed liquid entering the centrifugal chamber can be pushed by the spokes to quickly reach the highest centrifugal speed, thereby improving the separation efficiency. 2. The liquid-liquid separation device of the present invention adopts a special liquid-liquid separation drum, which can improve the separation efficiency; 3. The liquid-liquid separation device is equipped with a mesh ring plate and a maze mixing chamber, which can effectively improve the uniformity of the mixed liquid, ensure the centrifugal effect, and improve the separation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 2. It is a schematic diagram of the structure of a liquid-liquid separation drum; Figure 2 yes Figure 1 Cross-section along AA; Figure 3 is a schematic diagram of the structure of a liquid-liquid separation device; Figure 4 It is a schematic diagram of a mesh ring plate.

[0019] Description of reference numerals: 1. Rotating shaft; 2. Ceramic sleeve; 3. Negative pressure blades; 4. Interface adjustment ring; 5. Top cylinder; 6. Middle cylinder; 7. Bottom cylinder; 8. Suction pipe; 9. Liquid extraction blades; 10. Liquid inlet; 11. Separation plate; 12. Heavy phase hole; 13. Heavy phase outlet; 14. Light phase slot; 15. Light phase outlet; 16. Radial plate; 17. Centrifugal chamber; 18. Motor; 19. Shaft seat; 20. Exhaust channel; 21. Casing; 22. Heavy phase separation port; 23. Upper ring plate; 24. Lower ring plate; 25. Light phase separation port; 26. Mesh ring plate; 27. Feed inlet; 28. Labyrinth mixing chamber; 29. ​​Blocking vertical plate; 30. Support leg; 31. Blocking cylinder; 32. Aggregate chamber. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Unless otherwise specified, the raw materials and equipment used can be purchased from the market or are commonly used in the art. The methods in the embodiments are conventional methods in the art unless otherwise specified. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] Embodiment 1 See also Figure 1 , a liquid-liquid separation rotating cylinder comprises a cylinder body and a rotating shaft 1 in the center, the cylinder body is divided into a top cylinder 5, two middle cylinders 6 and a bottom cylinder 7, a sealing gasket is placed between adjacent cylinders, the bottom cylinder 7 has a bottom wall, a suction pipe 8 is coaxially connected below the bottom wall, and a liquid extraction fan blade 9 is fixedly connected to the bottom end of the suction pipe 8, the top cylinder 5 has a top wall, a circular heavy phase outlet 13 is opened in the center of the top wall, a horizontal separation plate 11 is arranged inside the top cylinder 5, a light phase groove 14 is arranged near the center of the bottom surface of the separation plate 11, and a light phase outlet 15 is opened to the outside of the top cylinder 5 on the groove wall of the light phase groove 14, a heavy phase hole 12 is arranged between the outer periphery of the separation plate 11 and the outer periphery inner wall of the top cylinder 5, a cavity is arranged between the separation plate 11 and the top plate, and the heavy phase hole 12 connects the cavity with the middle cylinder 6; Figure 2 As shown, the middle tube 6 and the bottom tube 7 both have an inner tube and an outer peripheral wall. The inner tube is sleeved on the rotating shaft 1. Eight vertical spokes 16 are arranged in a circumferential array between the inner tube and the outer peripheral wall. Two adjacent spokes 16, the inner tube and the outer peripheral wall form an independent centrifugal chamber 17. Eight liquid inlets 10 are provided on the bottom wall, and each centrifugal chamber 17 corresponds to one liquid inlet 10.

[0022] The lower half of the suction pipe 8 is a vertical circular tube, and the upper half of the tube wall expands outwards to form a funnel shape. The liquid inlet 10 is close to the top tube wall of the suction pipe 8, thereby ensuring the liquid inlet efficiency.

[0023] An interface adjustment ring 4 is concentrically connected to the top of the top wall. The inner diameter of the interface adjustment ring 4 is not larger than the heavy phase outlet 13. Interface adjustment rings 4 of different calibers are replaced to adjust the position of the light-heavy phase interface during centrifugation.

[0024] The liquid-liquid separation drum, when in use: The rotating shaft 1 is driven to rotate by the power system, driving the rotating drum to rotate, and the mixed liquid is extracted from the bottom through the liquid extraction blades 9 in the suction pipe 8. The mixed liquid begins to diffuse outward from the upper half of the suction pipe 8 and enters the centrifugal chamber 17 from the liquid inlet 10. The mixed liquid entering the centrifugal chamber 17 quickly reaches the maximum speed and begins to stratify. The heavy phase moves up through the heavy phase hole 12 and is separated from the heavy phase outlet 13, and the light phase is separated through the light phase groove 14 and the light phase outlet 15. According to the pre-calculated results, the interface adjustment ring 4 of the corresponding caliber is selected for installation to adjust the interface position of the light and heavy phases during centrifugation.

[0025] In some embodiments, the rotating shaft 1 is further provided with a porcelain sleeve 2 above the top cylinder 5 , and the porcelain sleeve 2 has negative pressure fan blades 3 for separating the device housing 21 to discharge the gas accumulated at the top.

[0026] Embodiment 2 The liquid-liquid separation device includes the above-mentioned liquid-liquid separation rotating cylinder, and is further provided with an outer shell 21 coaxial with the cylinder body, the outer shell is supported by a support leg 30, the cylinder body is located inside the outer shell 21, a shaft seat 19 is arranged above the outer shell 21 to connect the rotating shaft 1, the shaft seat 19 is equipped with a motor 18, the motor 18 drives the connecting rotating shaft 1, an upper ring plate 23 and a lower ring plate 24 are fixedly arranged on the inner wall of the outer shell 21, the inner ring of the upper ring plate 23 and the lower ring plate 24 are higher than the outer ring, the inner ring of the upper ring plate 23 is located between the top wall and the light phase outlet 15, the inner ring of the lower ring plate 24 is lower than the light phase outlet 15, the shell space above the upper ring plate 23 is a heavy phase guide space, the space between the lower ring plate 24 and the upper ring plate 23 is a light phase guide space, and the outer shell 21 corresponds to the heavy phase. A heavy phase separation port 22 and a light phase separation port 25 are provided in the phase guide space and the light phase guide space; a feed port 27 is provided on the middle and lower shell wall of the outer shell 21, and a circle of horizontal mesh ring plates 26 are fixedly connected to the inner wall of the outer shell 21 below the feed port 27, and the inner circle of the mesh ring plate 26 is upwardly connected to the blocking cylinder 31; the inner bottom of the outer shell 21 is a labyrinth mixing chamber 28, and a plurality of circles of intermittent blocking vertical plates 29 are provided in the labyrinth mixing chamber 28, a feed opening is provided in the center of the bottom wall of the labyrinth mixing chamber 28, and the bottom center of the outer shell 21 is connected to the collection chamber 32, and the suction pipe 8 is inserted into the collection chamber 32 through the feed opening, and the mixed liquid injected from the feed port 27 is homogenized by the diversion of the mesh ring plate 26 and the deceleration of the blocking vertical plate 29.

[0027] A liquid-liquid separation method, using the above-mentioned liquid-liquid separation device, comprises the following steps: S1. After the device is started, the motor 18 drives the shaft 1 to rotate through the belt, driving the drum to rotate; S2. The mixed liquid raw material injected from the feed port 27 falls through the mesh ring plate 26 and is broken up for the first time. When passing through the labyrinth mixing chamber 28, it is blocked by the vertical plate 29 and broken up for the second time. The two times of breaking up improve the uniformity of the mixed liquid. After the two times of breaking up, the mixed liquid enters the collecting chamber 32. S3. The liquid extraction blade 9 in the suction pipe 8 rotates at a high speed to extract the mixed liquid from the collecting chamber 32 and transport it upward. The mixed liquid begins to diffuse outward from the upper half of the suction pipe 8 and enters the centrifugal chamber 17 from the liquid inlet 10. The mixed liquid entering the centrifugal chamber 17 quickly reaches the maximum speed under the promotion of the spoke 16 and begins to stratify; S4. The heavy phase moves up through the heavy phase hole 12 and is separated from the heavy phase outlet 13, and flows out from the heavy phase separation outlet 22 through the heavy phase guide space. The light phase is separated through the light phase groove 14 and the light phase outlet 15, and flows out from the light phase separation outlet 25 through the light phase guide space, completing the separation.

[0028] In some embodiments, an exhaust passage 20 is disposed at the top center of the housing 21, and the negative pressure fan blades 3 discharge the gas at the top upward.

[0029] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the above embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A liquid-liquid separation drum, comprising a drum body and a central rotating shaft, characterized in that: The cylinder body is divided into a top cylinder, a middle cylinder and a bottom cylinder, and a sealing gasket is placed between adjacent cylinders. The bottom cylinder has a bottom wall, and a suction pipe is coaxially connected below the bottom wall. The suction pipe is fixedly connected with a liquid extraction fan blade. The top cylinder has a top wall, and a circular heavy phase outlet is opened at the center of the top wall. A horizontal separation plate is arranged inside the top cylinder, and a light phase groove is arranged near the center of the bottom surface of the separation plate. The groove wall of the light phase groove opens a light phase outlet to the outside of the top cylinder. A heavy phase hole is arranged between the outer periphery of the separation plate and the inner wall of the outer periphery of the top cylinder. A cavity is arranged between the separation plate and the top plate, and the heavy phase hole connects the cavity with the middle cylinder. Both the middle tube and the bottom tube have an inner tube and an outer peripheral wall. The inner tube is sleeved on the rotating shaft. A plurality of vertical spokes are arranged in a circumferential array between the inner tube and the outer peripheral wall. Two adjacent spokes, the inner tube and the outer peripheral wall form an independent centrifugal chamber. A plurality of liquid inlets are arranged on the bottom wall, and each centrifugal chamber corresponds to at least one liquid inlet.

2. The liquid-liquid separation drum according to claim 1, characterized in that: The lower half of the suction pipe is a vertical circular pipe, the upper half of the pipe wall expands outwards to be funnel-shaped, and the liquid inlet is close to the top pipe wall of the suction pipe.

3. The liquid-liquid separation drum according to claim 2, characterized in that: The rotating shaft is also sleeved with a porcelain sleeve, and the porcelain sleeve is provided with negative pressure fan blades.

4. The liquid-liquid separation drum according to claim 1, characterized in that: The barrel body is composed of a mixture of polyetheretherketone, glass fiber and carbon fiber materials, or a mixture of polyphenylene sulfide, glass fiber and carbon fiber materials, or polyvinylidene fluoride materials; the joints between the top barrel and the middle barrel, and between the middle barrel and the bottom barrel are welded with polyetheretherketone, polyphenylene sulfide or polyvinylidene fluoride materials.

5. The liquid-liquid separation drum according to claim 1, characterized in that: An interface adjustment ring is concentrically connected to the top of the top wall, and the inner diameter of the interface adjustment ring is not larger than the heavy phase outlet.

6. A liquid-liquid separation device, comprising a housing, characterized in that: The liquid-liquid separation drum as claimed in claim 3 is arranged inside the shell.

7. The liquid-liquid separation device according to claim 6, characterized in that: The outer shell is coaxial with the cylinder body, and a shaft seat connected to the rotating shaft is arranged above the outer shell. The shaft seat is equipped with a motor, and the motor drives the connecting rotating shaft. An upper ring plate and a lower ring plate are fixedly arranged on the inner wall of the outer shell, and the inner circles of the upper ring plate and the lower ring plate are higher than the outer circles. The inner circle of the upper ring plate is located between the top wall and the light phase outlet, and the inner circle of the lower ring plate is lower than the light phase outlet. The shell space above the upper ring plate is the heavy phase guide space, and the space between the lower ring plate and the upper ring plate is the light phase guide space. The outer shell has heavy phase separation port and light phase separation port corresponding to the heavy phase guide space and the light phase guide space.

8. The liquid-liquid separation device according to claim 7, characterized in that: A feed port is provided on the middle and lower shell wall of the outer shell, and a circle of horizontal mesh ring plates is fixedly connected to the inner wall of the outer shell below the feed port, and the inner circle of the mesh ring plate is upwardly connected to the blocking cylinder; the inner bottom of the outer shell is a maze mixing chamber, and the maze mixing chamber is provided with multiple circles of intermittent blocking vertical plates, and a drop port is opened at the center of the bottom wall of the maze mixing chamber, and the bottom center of the outer shell is connected to the aggregate chamber, and the suction pipe extends into the aggregate chamber through the drop port.

9. The liquid-liquid separation device according to claim 8, characterized in that: An exhaust passage is arranged at the top center of the shell.

10. A liquid-liquid separation method, characterized in that: The liquid-liquid separation device according to claim 8 further comprises the following steps: S1. After the device is started, the motor drives the shaft to rotate through the belt, driving the drum to rotate; S2. The mixed liquid raw material injected from the feed port falls through the mesh ring plate and is broken up for the first time. When passing through the maze mixing chamber, it is blocked by the vertical plate and broken up for the second time. The two times of breaking up improve the uniformity of the mixed liquid. After the two times of breaking up, the mixed liquid enters the aggregate chamber; S3. The liquid pumping blades in the suction pipe rotate at high speed to extract the mixed liquid from the collecting chamber and transport it upward. The mixed liquid begins to diffuse outward in the upper half of the suction pipe and enters the centrifugal chamber from the liquid inlet. The mixed liquid entering the centrifugal chamber quickly reaches the highest speed under the push of the radial plate and begins to stratify; S4. The heavy phase moves up through the heavy phase hole and is separated from the heavy phase outlet, and flows out from the heavy phase separation outlet through the heavy phase guide space. The light phase is separated through the light phase groove and the light phase outlet, and flows out from the light phase separation outlet through the light phase guide space, completing the separation.

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