A baffled rotating bed for reducing liquid backmixing

Abstract

The application discloses a baffle type rotary bed capable of reducing liquid back mixing, which comprises a cavity, a static disc, a rotor, a gas inlet and outlet and a liquid inlet and outlet. The gas outlet pipe is arranged at the top center of the cavity, the liquid inlet pipe is arranged at the center of the rotor, the gas inlet pipe is arranged at the lower end of the side wall of the cavity, and the liquid outlet pipe is arranged at the bottom of the cavity. The rotor is formed by embedding a group of concentric dynamic baffle rings fixed on the rotating disc and a group of concentric static baffle rings fixed on the static disc. The rotating disc and the rotating shaft are fixed, and the rotating shaft penetrates into the cavity from the bottom. The upper part of the dynamic baffle ring is provided with a circular hole and a tongue-shaped hole or an inclined hole, the circular holes are provided with inclined blades, the tongue-shaped hole or the inclined hole is opened downward and is arranged at the lowest two rows, and the static baffle ring is inclined to the outer edge of the static disc and is provided with a plurality of horizontal grooves on the inner wall surface. The application can reduce the liquid back mixing and improve the mass transfer efficiency of the rotary bed.

Description

Technical Field

[0001] This invention relates to a gas-liquid mass transfer device, and more particularly to a baffled rotating bed that reduces liquid backmixing. Background Technology

[0002] Hypergravity technology is a novel technique for enhancing gas-liquid mass transfer processes. Its core principle is to utilize a high-speed rotating bed to generate a powerful centrifugal force field that simulates a hypergravity environment. Under hypergravity, the gas and liquid phases flow and come into contact, and the immense shear force tears the liquid into micron- to nanometer-sized liquid films, filaments, and droplets, significantly enhancing microscopic mixing and mass transfer processes. This can increase the gas-liquid mass transfer coefficient by 1 to 2 orders of magnitude. Compared to traditional towers, hypergravity rotating beds offer higher mass transfer efficiency, smaller size, and easier operation. After years of development, hypergravity rotating beds have been widely applied in chemical, petrochemical, pharmaceutical, environmental, and materials industries.

[0003] Chinese patent CN01134321.4 discloses a baffle-type rotary bed, in which the rotor is a concentric baffle ring and the gas-liquid flow path through the rotor is "S" shaped, which greatly increases the effective radial mass transfer distance and prolongs the gas-liquid contact time. It has the advantages of uniform liquid distribution and low power consumption, and also solves the problems of intermediate feeding and dynamic sealing. However, this baffle-type rotary bed has the problems of more liquid back-mixing and low gas-liquid mass transfer efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a baffled rotating bed that reduces liquid backmixing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A baffle-type rotating bed for reducing liquid backmixing includes a cavity, a stationary disk, a rotor, a gas inlet / outlet, and a liquid inlet / outlet. The gas outlet pipe is located at the center of the top of the cavity, the liquid inlet pipe is located at the center of the rotor, the gas inlet pipe is located at the lower end of the cavity sidewall, and the liquid outlet pipe is located at the bottom of the cavity. The rotor consists of a set of concentric moving baffles fixed on the rotating disk and a set of concentric stationary baffles fixed on the stationary disk, nested together. The rotating disk and shaft are fixed, and the shaft passes through the bottom of the cavity. The moving baffles have tongue-shaped or oblique holes and circular holes on their upper parts, with inclined blades between the circular holes. The tongue-shaped or oblique holes open downwards and are arranged in the lowest two rows. The stationary baffles are inclined towards the outer edge of the stationary disk and have several horizontal grooves on their inner wall surface.

[0007] Preferably, the upper part of the moving baffle ring has a circular hole, and inclined blades are provided between the circular holes. The inclined blades are perpendicular to the moving baffle ring and have an angle of 10° to 80° with the rotation direction of the moving baffle ring.

[0008] Preferably, the upper part of the moving baffle ring has a tongue-shaped hole or an oblique hole, the tongue-shaped hole or oblique hole opens downward and is arranged in the lowest two rows, and the angle of the tongue-shaped hole or oblique hole is 10° to 80°.

[0009] Preferably, the static deflector ring is inclined toward the outer edge of the static disk, with an angle of 81° to 89° with the static disk.

[0010] Preferably, several horizontal grooves are formed on the inner wall of the static deflector ring, and the grooves are rectangular, U-shaped or V-shaped.

[0011] The beneficial effects of this invention are:

[0012] 1. By incorporating tongue-shaped or oblique holes in the moving baffle, the ejected droplets acquire a downward velocity component, reducing the entrainment of mist by the upward-flowing gas. 2. The droplets impact the inner wall of the stationary baffle at an angle downwards, reducing the amount of upward-moving liquid film. The outward inclination of the stationary baffle and the horizontal grooves on its inner wall further weaken the upward movement of the liquid film, thus reducing backmixing. 3. Inclined blades on the moving baffle intercept gas-entrained droplets, forming a liquid film on the blades before being ejected onto the inner wall of the stationary baffle, thereby reducing the amount of mist entrained in the gas. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a baffle-type rotating bed structure for reducing liquid backmixing according to the present invention;

[0014] Figure 2 This is a schematic diagram of the rotor structure and internal gas-liquid flow;

[0015] Figure 3 These are cross-sectional and front views of the tongue-shaped hole and the oblique hole;

[0016] Figure 4 This is a diagram showing the arrangement of the upper holes and inclined blades of the moving baffle.

[0017] Reference numerals: 1-Gas inlet pipe, 2-Stationary baffle, 3-Stationary disc, 4-Gas inlet pipe, 5-Liquid inlet pipe, 6-Cavity, 7-Liquid outlet pipe, 8-Shaft, 9-Central chamber, 10-Rotor, 11-Moving baffle, 12-Liquid, 13-Round hole, 14-Tongue-shaped hole or oblique hole, 15-Horizontal groove, 16-Droplet, 17-Liquid film, 18-Inclined blade, 19-Gas. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings:

[0019] Example 1:

[0020] like Figure 1As shown, a baffle-type rotating bed for reducing liquid backmixing includes a cavity 6, a stationary disk 3, a rotor 10, a gas inlet / outlet, and a liquid inlet / outlet. A gas outlet pipe 4 is located at the top center of the cavity 6, a liquid inlet pipe 5 is located at the center of the rotor 10, a gas inlet pipe 1 is located at the lower end of the side wall of the cavity 6, and a liquid outlet pipe 7 is located at the bottom of the cavity 6. The rotor 10 is formed by a set of concentric moving baffle rings 11 fixed on the rotating disk and a set of concentric stationary baffle rings 2 fixed on the stationary disk 3, nested together. The rotating disk and a rotating shaft 8 are fixed, with the rotating shaft 8 passing through the bottom of the cavity 6.

[0021] like Figure 2 As shown, the moving baffle ring 11 has a circular hole 13 and a tongue-shaped hole or oblique hole 14 on its upper part. Inclined blades 18 are provided between the circular holes 13. The tongue-shaped holes or oblique holes 14 open downward and are arranged in the lowest two rows. The stationary baffle ring 2 is inclined towards the outer edge of the stationary disk 3 and has several horizontal grooves 15 on its inner wall. The liquid 12 flows from the inner edge of the rotor to the outer edge of the rotor, and the gas 19 flows from the outer edge of the rotor to the inner edge of the rotor. The liquid droplets 16 are perforated liquids, and the liquid film 17 is formed on the inner wall of the moving and stationary baffle rings.

[0022] like Figure 3 The diagram shows a cross-sectional view and a front view of the tongue-shaped hole (a) and the oblique hole (b).

[0023] like Figure 4 As shown, the round hole 13 and the tongue-shaped hole or oblique hole 14 are arranged in an equilateral triangle. The inclined blade 18 is perpendicular to the moving baffle ring 11 and the angle between it and the rotation direction of the moving baffle ring 11 is 10° to 80°.

[0024] The specific working process of this embodiment is as follows: Gas enters the cavity 6 tangentially from the gas inlet pipe 1, and then enters the rotor 10. Under the action of pressure difference, it flows from the outer edge of the rotor to the inner edge of the rotor along the S-shaped channel formed by the gap of the baffle ring. Some gas climbs along the inclined blades and passes through the circular hole 13, and finally enters the central chamber 9 of the rotor, and is discharged through the gas outlet pipe 4. Liquid enters the central chamber 9 of the rotor 10 from the liquid inlet pipe 5. Under the action of centrifugal force, it flows from the inner edge of the rotor to the outer edge of the rotor. The liquid forms a liquid film 17 on the inner wall of the moving baffle ring 11, and is dispersed into droplets 16 through the tongue-shaped hole or the inclined hole 14. The droplets 16 obliquely strike the inner wall of the stationary baffle ring 2 with the horizontal groove 15. At the same time, the droplets entrained by the gas are intercepted by the inclined blades 18. After forming a liquid film on the blades, they are thrown onto the inner wall of the stationary baffle ring 2. The liquid film 17 flows downward along the inclined stationary baffle ring 2 and falls into the rotor 10, and is finally discharged through the liquid outlet pipe 7.

[0025] Example 2:

[0026] When used for absorption or desorption, the mixed gas enters the rotor tangentially from the gas inlet pipe, and the absorbent enters the rotor's central chamber from the liquid inlet pipe. Under the action of pressure difference and centrifugal force, the gas and liquid phases undergo countercurrent contact mass transfer, and finally, the gas and liquid are discharged through the gas outlet pipe and liquid outlet pipe. Using the baffle-type rotating bed of Example 1 greatly reduces the decrease in mass transfer driving force caused by backmixing, increasing the gas absorption rate by 10%–20% under the same conditions. To achieve the same absorption effect, the number of baffle rings can be reduced, lowering manufacturing costs.

[0027] Example 3:

[0028] Using ethanol-water as the system, under a centrifugal rotating bed speed of 1200 r / min, a total reflux atmospheric pressure distillation experiment was conducted using a baffled rotating bed with an inner diameter of 400 mm, an outer diameter of 1000 mm, and a height of 100 mm, with only a circular hole at the top of the moving baffle ring, and the baffled rotating bed of Example 1. The baffled rotating bed of Example 1 achieved a theoretical plate number of 3.6–5.2, representing a 15%–30% increase under the same conditions. Simultaneously, no flooding occurred and mist entrainment was significantly reduced. This demonstrates that the present invention can effectively reduce liquid backmixing and improve mass transfer efficiency, thus possessing broad application prospects.

Claims

1. A baffle-type rotating bed for reducing liquid backmixing, comprising a cavity (6), a stationary disc (3), a rotor (10), a gas outlet pipe (4), a gas inlet pipe (1), a liquid inlet pipe (5), and a liquid outlet pipe (7), characterized in that, The gas outlet pipe (4) is located at the top center of the cavity (6), the liquid inlet pipe (5) is located at the center of the rotor (10), the gas inlet pipe (1) is located at the lower end of the side wall of the cavity (6), and the liquid outlet pipe (7) is located at the bottom of the cavity (6). The rotor (10) is formed by a set of concentric moving baffle rings (11) fixed on the rotating disk and a set of concentric stationary baffle rings (2) fixed on the stationary disk (3). The rotating disk is fixedly connected to a rotating shaft (8), which passes through the bottom of the cavity (6). The moving baffle ring (11) has a circular hole (13) at its upper part, and inclined blades (18) are provided between the circular holes. The inclined blades (18) are perpendicular to the moving baffle ring (11). The moving baffle ring (11) has an oblique hole (14) on its upper part, and the oblique hole (14) opens downward and is arranged in the lowest two rows; The static baffle ring (2) is inclined toward the outer edge of the static disk (3); Several horizontal grooves (15) are opened on the inner wall surface of the static deflector ring (2).

2. The baffle-type rotating bed for reducing liquid backmixing according to claim 1, characterized in that: The angle between the tilting blade (18) and the rotating direction of the moving baffle (11) is 10°~80°.

3. A baffle-type rotating bed for reducing liquid backmixing according to claim 1, characterized in that: The angle of the oblique hole (14) is 10°~80°.

4. A baffle-type rotating bed for reducing liquid backmixing according to claim 1, characterized in that: The angle between the static baffle ring (2) and the static disk (3) is 81°~89°.

5. A baffle-type rotating bed for reducing liquid backmixing according to claim 1, characterized in that: The groove shape is rectangular, U-shaped, or V-shaped.

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