A supergravity bed integrated with a reboiler

Abstract

A high-gravity bed with an integrated reboiler includes a shell and a rotor disposed within the shell. The rotor includes an upper disk and a lower disk, with the lower disk connected to a shaft driving its rotation. Several concentric rings of different diameters are arranged between the upper and lower disks, forming a central chamber in the center of each ring. The central chamber communicates with a gas outlet pipe located on the upper part of the shell. A four-claw-shaped liquid distributor is disposed within the central chamber and connected to a liquid inlet pipe. Rectangular holes are evenly distributed on the concentric rings, and baffles are connected to the inner or outer sides of the rectangular holes, forming bridge holes between the baffles. A reboiler is installed in the bottom of the shell, and a liquid outlet pipe is located at the bottom of the shell. This invention integrates the rotor and reboiler into one unit, making the overall structure of the device more compact and rational. The high open area ratio of the rotor increases the throughput of the high-gravity bed, meeting the needs of high-throughput production.

Description

Technical Field

[0001] This invention belongs to the technical field of gas-liquid mass transfer equipment, specifically relating to a supergravity bed with an integrated reboiler. Background Technology

[0002] Centrifugal technology utilizes a centrifugal force field instead of a traditional gravity field to enhance mass transfer processes between different phases. The centrifugal force field can disperse liquids into micron- to nanometer-sized liquid films and droplets, generating large, rapidly renewing phase interfaces. As a means of intensifying chemical processes, centrifugal technology can effectively reduce equipment size and footprint, offering advantages such as high mass transfer efficiency, low cost, and easy installation. Although centrifugal beds offer higher mass and heat transfer efficiencies than traditional distillation columns, their throughput is limited, making it difficult for a single unit to handle large-scale industrial production.

[0003] Currently, the gas-liquid flux that a supergravity bed can handle is relatively small. For supergravity beds without a liquid distributor, the gas-liquid mass transfer rate is also low. CN203763886 discloses a large-diameter supergravity bed mass transfer and reaction device, which, although capable of handling large gas volumes, has low mass transfer efficiency, large liquid hold-up, and a complex structure. CN112206698A discloses a baffle-type supergravity bed with an integrally rotating rotor. While this device provides good liquid dispersion, the tortuous gas-liquid flow path leads to a large gas pressure drop, limiting its separation capacity and throughput, significantly impacting the industrial application of supergravity beds. At present, all supergravity devices used in distillation processes require a reboiler to heat the materials, resulting in a relatively large footprint for the entire system. Summary of the Invention

[0004] In view of the problems mentioned in the background art, the purpose of this invention is to provide a supergravity bed with an integrated reboiler that has a high gas-liquid mass transfer rate, low liquid holdup, low pressure drop, and small footprint.

[0005] The technical solution adopted in this invention is:

[0006] A supergravity bed with an integrated reboiler includes a shell and a rotor disposed within the shell. The rotor includes an upper disc and a lower disc. The lower disc is connected to a shaft that drives its rotation. Several concentric rings of different diameters are arranged between the upper and lower discs, forming a central chamber in the middle of the concentric rings. The central chamber is connected to a gas outlet pipe disposed on the upper part of the shell. A four-claw-shaped liquid distributor is disposed within the central chamber and is connected to a liquid inlet pipe. Rectangular holes are evenly distributed on the concentric rings. Baffles are connected to the inner or outer sides of the rectangular holes on the concentric rings, forming bridge holes between the baffles. A reboiler is installed in the bottom of the shell, and a liquid outlet pipe is disposed at the bottom of the shell.

[0007] Furthermore, the reboiler includes a heating steam pipe coiled around and installed at the bottom of the shell, the heating steam pipe having a heating steam outflow pipe and a heating steam inflow pipe, both of which pass through the lower side of the shell.

[0008] Furthermore, the four-claw liquid distributor includes a ring tube, with a liquid inlet pipe connected to and communicating with the ring tube at the top, and four vertically arranged liquid distribution pipes connected to and communicating with the ring tube at the bottom. The bottom of the liquid distribution pipe is sealed, and several liquid outlet holes are provided on the side facing the concentric ring.

[0009] Furthermore, the liquid distribution pipe is provided with 1 to 10 liquid outlet holes, the shape of which is circular, inwardly inclined, or outwardly inclined, and the area of ​​which is 0.1 to 0.35 times the area of ​​the liquid distribution pipe.

[0010] Furthermore, the diameter of the ring tube is 0.65 to 0.8 times the diameter of the innermost circle of the concentric rings, and the rotating shaft passes through the center of the ring tube and is fixedly connected to the lower turntable.

[0011] Furthermore, the baffle is longitudinally connected to the concentric ring, and the bridge holes formed between the baffle and the concentric ring are arranged laterally.

[0012] Alternatively, the baffle is horizontally connected to the concentric ring, and the bridge holes formed between the baffle and the concentric ring are arranged longitudinally.

[0013] Furthermore, the area of ​​the rectangular hole is equal to 1 to 2 times the sum of the areas of the two symmetrical bridge holes.

[0014] Furthermore, the shape of the baffle is arc-shaped, rectangular, or trapezoidal.

[0015] Furthermore, the rotating shaft is connected to a motor disposed outside the housing, a shaft seal is provided between the rotating shaft and the housing, and a dynamic seal is provided between the upper turntable and the housing.

[0016] Compared with the prior art, the significant advantages of this invention include:

[0017] 1. The rotor and reboiler are integrated into one unit, that is, both are set inside the shell, making the overall structure of the device more compact and reasonable;

[0018] 2. The liquid is distributed by the liquid distributor, forming a good initial axial and circumferential distribution of the liquid;

[0019] 3. The high aperture ratio of the rotor increases the throughput of the supergravity bed, which can meet the needs of high-throughput production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the four-claw liquid distributor of the present invention;

[0022] Figure 3 This is a top view of the heating steam pipe of the present invention;

[0023] Figure 4 This is a schematic diagram of the concentric ring structure of the present invention, in which the arc-shaped baffle is located on the outside of the concentric ring and the transverse bridge hole is located.

[0024] Figure 5 This is a schematic diagram of the concentric ring structure of the present invention, in which the rectangular baffle is disposed on the outside of the concentric ring and the transverse bridge hole is located.

[0025] Figure 6 This is a schematic diagram of the concentric ring structure of the present invention, in which the trapezoidal baffle is located on the outside of the concentric ring and the transverse bridge hole is located.

[0026] Figure 7 This is a schematic diagram of the concentric ring structure of the present invention, in which the arc-shaped baffle is disposed on the inner side of the concentric ring and the transverse bridge hole is located.

[0027] Figure 8 This is a schematic diagram of the concentric ring structure of the present invention, in which the arc-shaped baffle is located on the outside of the concentric ring and the longitudinal bridge hole is located.

[0028] Figure 9 This is a schematic diagram of the concentric ring structure of the present invention, in which the arc-shaped baffle is located inside the concentric ring and the longitudinal bridge hole is arranged.

[0029] Explanation of reference numerals in the attached drawings: 1-lower turntable, 2-concentric ring, 3-shell, 4-gas outlet pipe, 5-rotating shaft, 6-motor, 7-shaft seal, 8-liquid inlet pipe, 9-four-claw liquid distributor, 10-dynamic seal, 11-upper turntable, 12-liquid outlet pipe, 13-heating steam pipe, 14-heating steam pipe support frame, 15-heating steam inflow pipe, 16-heating steam outflow pipe, 17-rectangular hole, 18-bridge hole, 19-baffle, 20-liquid distribution pipe, 21-ring pipe, 22-liquid outlet hole. Detailed Implementation

[0030] The present invention will be further described below with reference to specific embodiments, but the invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all alternatives, improvements, and equivalents that may be included within the scope of the claims.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] See Figure 1-4This embodiment provides a high-gravity bed with an integrated reboiler, including a shell 3 and a rotor disposed within the shell 3. The rotor includes an upper rotating disk 11 and a lower rotating disk 1. The lower rotating disk 1 is connected to a rotating shaft 5 that drives its rotation. The rotating shaft 5 is connected to a motor 6 disposed outside the shell 3. A shaft seal 7 is provided between the rotating shaft 5 and the shell 3. A dynamic seal 10 is provided between the upper rotating disk 11 and the shell 3. A plurality of concentric rings 2 with different diameters are disposed between the upper rotating disk 11 and the lower rotating disk 1, forming a central chamber in the middle of the concentric rings 2. The axial chamber is connected to the gas outlet pipe 4 located on the upper part of the shell 3; a four-claw liquid distributor 9 is provided in the axial chamber, and the four-claw liquid distributor 9 is connected to the liquid inlet pipe 8; rectangular holes 17 are evenly distributed on the concentric ring 2, and a baffle 19 is connected to the inner or outer side of the rectangular hole 17 of the concentric ring 2, forming a bridge hole 18 for gas and liquid to flow between the baffle 19; a reboiler for heating the material at the bottom of the shell 3 is installed in the bottom of the shell 3, and a liquid outlet pipe 12 for discharging the liquid at the bottom of the shell 3 is provided at the bottom of the shell 3.

[0035] The reboiler described in this embodiment includes a heating steam pipe 13 coiled around the bottom of the shell 3. The heating steam pipe 13 is mounted via a heating steam pipe support 14. The heating steam pipe 13 has a heating steam outlet pipe 15 and a heating steam inlet pipe 16, both of which pass through the lower side of the shell 3. The heating steam pipe 13 is made of 304 stainless steel or aluminum alloy.

[0036] The four-claw-shaped liquid distributor 9 described in this embodiment includes a ring tube 21. A liquid inlet pipe 8 is connected to and communicates with the ring tube 21 at its top. Four vertically arranged liquid distribution pipes 20 are connected to and communicate with the ring tube 21 at its bottom. The bottom of each liquid distribution pipe 20 is sealed, and several liquid outlet holes 22 are provided on the side facing the concentric ring 2. Each liquid distribution pipe 20 has 1 to 10 liquid outlet holes 22, which are circular, have an inner oblique hole, or an outer oblique hole. The area of ​​each liquid outlet hole 22 is 0.1 to 0.35 times the area of ​​the liquid distribution pipe 20. The diameter of the ring tube 21 is 0.65 to 0.8 times the diameter of the innermost ring of the concentric ring 2. The rotating shaft 5 passes through the center of the ring tube 21 and is fixedly connected to the lower turntable 1.

[0037] In this embodiment, the baffle 19 is longitudinally connected to the outer side of the concentric ring 2, and the bridge holes 18 formed between the baffle 19 and the concentric ring 2 are arranged laterally. The baffle 19 is arc-shaped, see... Figure 4 As shown. The area of ​​the rectangular hole 17 is equal to 1 to 2 times the sum of the areas of the two symmetrical bridge holes 18. Of course, the baffle 19 can also be a rectangular or trapezoidal structure, see... Figure 5 , Figure 6As shown.

[0038] In use, the electric motor 6 drives the rotating shaft 5 to rotate the rotor and generate centrifugal force. The liquid flows from the liquid inlet pipe 8 through the ring pipe 21 into the liquid distribution pipe 20. After being distributed by the liquid distribution pipe 20, it is evenly sprayed out from the liquid outlet hole 22 in a circumferential axial direction. The liquid is sprayed out through the hole into fine droplets and liquid filaments, which impact the concentric ring 2. Under the action of centrifugal force, it passes from the inside to the outside through the rectangular hole 17 and bridge hole 18 on the concentric ring 2 and comes into countercurrent contact with the gas. Finally, it is discharged through the liquid outlet pipe 12 at the bottom of the shell 3. The material at the bottom of the shell 3 is heated into rising gas by the heating steam pipe 13 located at the bottom of the shell 3. It passes from the outside to the inside radially through the bridge hole 18 and rectangular hole 17 on the concentric ring 2. The liquid comes into countercurrent contact, and heat and mass are transferred. Finally, it is discharged through the gas outlet pipe 4.

[0039] Using ethanol-water as the liquid system, and under a centrifugal bed rotation speed of 1000 r / min, both a concentric centrifugal bed with an inner diameter of 380 mm, an outer diameter of 1200 mm, and a height of 160 mm and featuring a circular orifice without a liquid distributor, and the novel centrifugal bed of this invention, were subjected to atmospheric pressure total reflux distillation experiments. Under the same operating conditions, the theoretical plate number of the centrifugal bed described in this invention can reach 8.2 to 12.1 plates per meter, which is 15% to 20% higher than that of the concentric centrifugal bed. This indicates that the centrifugal bed described in this invention has excellent mass transfer efficiency and broad application prospects.

[0040] In this invention, the rotor and reboiler are integrated into one unit, that is, both are set inside the shell, making the overall structure of the device more compact and reasonable; the liquid is distributed by the liquid distributor, forming a good initial axial and circumferential distribution of the liquid; the rotor with high opening ratio increases the throughput of the ultragravity bed, which can meet the needs of high-throughput production.

[0041] Example 2

[0042] Reference Figure 7 The difference between this embodiment and embodiment one is that the baffle 19 is longitudinally connected to the inner side of the concentric ring 2.

[0043] The remaining structures and functions can be referred to in Embodiment 1.

[0044] Example 3

[0045] Reference Figure 8 The difference between this embodiment and embodiment one is that the baffle 19 is horizontally connected to the concentric ring 2, and the bridge holes 18 formed between the baffle 19 and the concentric ring 2 are arranged longitudinally.

[0046] The remaining structures and functions can be referred to in Embodiment 1.

[0047] Example 4

[0048] Reference Figure 9 The difference between this embodiment and embodiment three is that the baffle 19 is longitudinally connected to the inner side of the concentric ring 2.

[0049] The remaining structures and functions can be referred to in Embodiment 3.

Claims

1. A high-gravity bed with an integrated reboiler, comprising a shell and a rotor disposed within the shell, the rotor including an upper rotating disk and a lower rotating disk, the lower rotating disk being connected to a shaft driving its rotation, a plurality of concentric rings of different diameters being disposed between the upper and lower rotating disks, forming an axial chamber in the center of the concentric rings; the axial chamber communicating with a gas outlet pipe disposed on the upper part of the shell; a four-claw-shaped liquid distributor being disposed within the axial chamber, the four-claw-shaped liquid distributor being connected to a liquid inlet pipe; characterized in that: The concentric rings are evenly distributed with rectangular holes, and the concentric rings are connected to baffles on the inner or outer sides of the rectangular holes to form bridge holes with the baffles; a reboiler is installed in the bottom of the shell, and a liquid outlet pipe is provided at the bottom of the shell.

2. The high-gravity bed with an integrated reboiler according to claim 1, characterized in that: The reboiler includes a heating steam pipe coiled around the bottom of the shell, the heating steam pipe having a heating steam outflow pipe and a heating steam inflow pipe, both of which pass through the lower side of the shell.

3. The high-gravity bed with an integrated reboiler according to claim 1, characterized in that: The four-claw liquid distributor includes a ring tube, with a liquid inlet pipe connected to the top of the ring tube and communicating with it. Four vertically arranged liquid distribution pipes are connected to the bottom of the ring tube and communicating with it. The bottom of the liquid distribution pipe is sealed, and several liquid outlet holes are provided on the side facing the concentric circle.

4. The high-gravity bed with an integrated reboiler according to claim 3, characterized in that: The liquid distribution pipe is provided with 1 to 10 liquid outlet holes, the shape of which is circular, inwardly inclined, or outwardly inclined, and the area of ​​which is 0.1 to 0.35 times the area of ​​the liquid distribution pipe.

5. A high-gravity bed with an integrated reboiler according to claim 3, characterized in that: The diameter of the ring tube is 0.65 to 0.8 times the diameter of the innermost circle of the concentric rings, and the rotating shaft passes through the center of the ring tube and is fixedly connected to the lower turntable.

6. The high-gravity bed with an integrated reboiler according to claim 1, characterized in that: The baffle is longitudinally connected to the concentric ring, and the bridge holes formed between the baffle and the concentric ring are arranged laterally.

7. A high-gravity bed with an integrated reboiler according to claim 1, characterized in that: The baffle is horizontally connected to the concentric ring, and the bridge holes formed between the baffle and the concentric ring are arranged longitudinally.

8. A high-gravity bed with an integrated reboiler according to claim 1, characterized in that: The area of ​​the rectangular hole is equal to 1 to 2 times the sum of the areas of the two symmetrical bridge holes.

9. A high-gravity bed with an integrated reboiler according to claim 8, characterized in that: The shape of the baffle is arc-shaped, rectangular, or trapezoidal.

10. A high-gravity bed with an integrated reboiler according to claim 1, characterized in that: The rotating shaft is connected to a motor located outside the housing. A shaft seal is provided between the rotating shaft and the housing, and a dynamic seal is provided between the upper turntable and the housing.

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