A redistributor for a small gas-liquid mass transfer packing column

Abstract

This invention discloses a redistributor for a small gas-liquid mass transfer packed tower, comprising: a baffle plate, riser pipes, downcomer pipes, supports, and a flow-blocking ring; two or more riser pipes are mounted on the baffle plate and are evenly distributed along the circumference of the baffle plate; each riser pipe passes through the baffle plate; the flow-blocking ring is a frustum-shaped shell with open ends, and is fixed above the riser pipes by several supports; the smaller end of the flow-blocking ring faces upward and the larger end faces downward, and the flow-blocking ring can completely cover the riser pipes in the vertical direction; the downcomer pipe is coaxially mounted at the center of the baffle plate and passes through the baffle plate; the redistributor is coaxially mounted inside the packed tower through the baffle plate, which divides the internal space of the packed tower into upper and lower parts; the upper and lower parts of the internal space of the packed tower are connected by the riser pipes and the downcomer pipes; this invention is applicable to small gas-liquid mass transfer packed towers and has liquid sampling and measurement functions.

Description

Technical Field

[0001] This invention belongs to the technical field of gas-liquid mass transfer equipment, specifically relating to a redistributor for a small gas-liquid mass transfer packed tower. Background Technology

[0002] Small gas-liquid mass transfer packed towers are widely used in scientific research fields such as carbon dioxide capture and sulfur dioxide absorption. Their working principle utilizes the large surface area of ​​the packing material to achieve efficient mass transfer through full contact between the gas and liquid phases. However, within the packed tower, wall flow occurs as the liquid flows downwards along the packing layer, meaning the liquid gradually concentrates towards the tower wall, leading to increased liquid flow near the wall and reduced packing efficiency. To reduce wall flow, when the packing layer is high, it needs to be layered, and liquid redistributors need to be installed between the packing layers to ensure uniform liquid distribution within the packing and maintain a high mass transfer efficiency.

[0003] Mass transfer packed towers used in scientific research typically have small diameters, and it is necessary to sample and analyze the gas and liquid phases at different locations within the tower, as well as measure temperatures, to conduct mass transfer kinetics and thermodynamic studies. For these purposes, traditional tray-type and inclined plate-type redistributors are unsuitable for small-scale mass transfer packed towers due to their complex structures and large dimensions. Furthermore, small liquid redistributors such as truncated cone-type, internal gear-type, and petal-type (CN202110120114.X) lack sampling and measurement capabilities. Summary of the Invention

[0004] In view of this, the present invention provides a redistributor for small gas-liquid mass transfer packed towers, which is suitable for small gas-liquid mass transfer packed towers and has liquid sampling and measurement functions.

[0005] This invention is achieved through the following technical solution:

[0006] A redistributor for a small gas-liquid mass transfer packed tower includes: a baffle plate, a riser pipe, a downcomer pipe, a support, and a flow-blocking ring.

[0007] The partition is a circular plate;

[0008] Two or more riser tubes are mounted on the partition, and the two or more riser tubes are evenly distributed along the circumference of the partition; each riser tube passes through the partition.

[0009] The flow-blocking ring is a frustum-shaped shell with openings at both ends. The flow-blocking ring is fixed above the riser pipe by several supports, and the flow-blocking ring is coaxially distributed with the baffle. The small end of the flow-blocking ring faces upward and the large end faces downward, and the flow-blocking ring can completely cover the riser pipe in the vertical direction.

[0010] The downcomer is coaxially installed at the center of the partition and penetrates the partition.

[0011] The distributor is coaxially installed inside the packed tower via a partition, positioned between two sections of packing material. The partition divides the internal space of the packed tower into upper and lower parts. The upper and lower parts of the internal space of the packed tower are connected by a gas riser and a downcomer. The partition is horizontal, and the axis of the downcomer is vertical.

[0012] Furthermore, one or two side holes are machined on the side wall of the downcomer, close to the upper surface of the partition plate.

[0013] Furthermore, the length of the downcomer above the partition plate is 10-15% of the inner diameter of the packed tower, and the length of the downcomer below the partition plate is 20-30% of the inner diameter of the packed tower; the diameter of the side holes of the downcomer is 2-3 mm; the wall thickness of the downcomer is 1-3 mm, and the inner diameter of the downcomer is 5-10% of the inner diameter of the packed tower.

[0014] Furthermore, the diameter of the partition plate is 5-10% smaller than the inner diameter of the packed tower; the outer circumferential surface of the partition plate is machined with a groove, and a fixing rubber ring is inserted into the groove.

[0015] Furthermore, the inner diameter of each riser pipe is 20-30% of the inner diameter of the packed tower, the wall thickness is 1-3mm, the distance between the center of the riser pipe and the center of the baffle is 20% of the inner diameter of the packed tower, the length of the riser pipe above the baffle is 20-30% of the inner diameter of the packed tower, and the length of the riser pipe below the baffle is 5-10% of the inner diameter of the packed tower.

[0016] Furthermore, the wall thickness of the flow-blocking ring 2 is 1-3mm, the inner diameter of the small end of the flow-blocking ring 2 is 10-20% of the inner diameter of the packed tower, the outer diameter of the large end of the flow-blocking ring 2 is 65-75% of the inner diameter of the packed tower, the angle between the generatrix of the flow-blocking ring 2 and the shaft is 50-70 degrees, and the distance between the large end of the flow-blocking ring 2 and the top of the riser pipe is 15-30mm.

[0017] Beneficial effects:

[0018] (1) This invention is applicable to a high-efficiency liquid redistributor for small gas-liquid mass transfer packed towers. It has a reasonable design, simple structure, low manufacturing cost, and convenient installation and use. It can effectively collect wall flow, has a large air passage cross-sectional area, and can simultaneously realize liquid sampling and measurement functions. Compared with the traditional riser-type redistributor, it optimizes the riser structure, simplifies the manufacturing process, has a larger air passage cross-sectional area, lowers gas pressure, and, relying on the design of the downcomer, can achieve efficient liquid sampling while realizing liquid redistribution.

[0019] (2) The present invention has one or two side holes on the side wall of the downcomer, close to the upper surface of the baffle plate. When the packed tower stops running, the liquid on the upper surface of the baffle plate flows down through the side holes, which can prevent liquid accumulation in the distributor.

[0020] (3) The present invention has a groove processed on the outer circumferential surface of the partition plate, and a fixing rubber ring is placed in the groove, which makes it easy to fix the distributor on the inner wall of the packed tower, and at the same time prevents the liquid from flowing out from the gap connecting the partition plate and the packed tower. Attached Figure Description

[0021] Figure 1 This is a structural composition diagram of the present invention;

[0022] Among them, 1-partition, 2-air riser pipe, 3-liquid faller pipe, 4-support, 5-flow shielding ring, 6-side hole, 7-slot. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] This embodiment provides a redistributor for a small gas-liquid mass transfer packed tower, see attached diagram. Figure 1 It includes: 1. baffle plate, 2. riser pipe, 3. downcomer pipe, 4. support and 5. flow shielding ring;

[0025] The partition 1 is a circular plate with a diameter smaller than 5-10% of the inner diameter of the packed tower. The partition 1 provides installation support for the distributor, that is, the distributor is coaxially fixed inside the packed tower by the partition 1 and placed between two sections of packing inside the packed tower. The partition 1 divides the internal space of the packed tower into upper and lower parts. In this embodiment, the diameter of the partition 1 is 95% of the inner diameter of the packed tower. The outer circumferential surface of the partition 1 is machined with a groove 7, and a fixing rubber ring is inserted in the groove 7 to facilitate fixing the distributor to the inner wall of the packed tower. At the same time, it can also prevent liquid from flowing out from the gap between the partition 1 and the packed tower.

[0026] Two or more riser pipes 2 are installed on the partition plate 1, and the two or more riser pipes 2 are evenly distributed along the circumference of the partition plate 1; each riser pipe 2 passes through the partition plate 1, and the riser pipe 2 is used for gas flow in the packed tower; in this embodiment, three riser pipes 2 are used, and the three riser pipes 2 are arranged in a triangular pattern on the partition plate.

[0027] In this embodiment, the inner diameter of each riser pipe 2 is 20-30% of the inner diameter of the packed tower, the wall thickness is 1-3mm, the distance between the center of the riser pipe 2 and the center of the partition plate 1 is 20% of the inner diameter of the packed tower, the length of the riser pipe 2 above the partition plate 1 is 20-30% of the inner diameter of the packed tower, and the length of the riser pipe 2 below the partition plate 1 is 5-10% of the inner diameter of the packed tower. In this embodiment, the inner diameter of the riser pipe 2 is 25% of the inner diameter of the packed tower, the wall thickness is 2mm, the length of the riser pipe 2 above the partition plate 1 is 25% of the inner diameter of the packed tower, and the length of the riser pipe 2 below the partition plate 1 is 5% of the inner diameter of the packed tower.

[0028] The flow-blocking ring 5 is a frustum-shaped shell open at both ends. It is fixed above the riser pipe 2 by several supports 4, and is coaxially distributed with the partition plate 1. The smaller end of the flow-blocking ring 5 faces upwards, and the larger end faces downwards. The flow-blocking ring 5 can completely cover the riser pipe 2 vertically; that is, the inner diameter of the smaller end of the flow-blocking ring 5 is less than twice the minimum distance from the outer wall of the riser pipe 2 to the center of the partition plate 1, and the outer diameter of the larger end of the flow-blocking ring 5 is greater than twice the maximum distance from the outer wall of the riser pipe 2 to the center of the partition plate 1. The flow-blocking ring 5 is used to guide the liquid flow, increase airflow disturbance to achieve uniform gas distribution, and effectively shield the top of the riser pipe 2 to prevent liquid from entering the riser pipe 2.

[0029] Wherein, the wall thickness of the baffle ring 2 is 1-3mm, the inner diameter of the small end of the baffle ring 2 is 10-20% of the inner diameter of the packing tower, the outer diameter of the large end of the baffle ring 2 is 65-75% of the inner diameter of the packing tower, the angle between the generatrix of the baffle ring 2 and the axis is 50-70 degrees, that is, the angle between the inclined surface of the baffle ring 2 and the horizontal plane is 20-40 degrees; the distance between the large end of the baffle ring 2 and the top of the riser pipe 2 is 15-30mm; in this embodiment, the wall thickness of the baffle ring 2 is 1mm, it is fixed above the riser pipe 2 by three supports 4, the inner diameter of the small end of the baffle ring 2 is 15% of the inner diameter of the packing tower, the outer diameter of the large end of the baffle ring 2 is 60% of the inner diameter of the packing tower, the angle between the inclined surface of the baffle ring 2 and the horizontal plane is 20 degrees, and the distance between the large end of the baffle ring 2 and the top of the riser pipe 2 is 25mm;

[0030] The downcomer 3 is coaxially installed at the center of the partition 1, and the downcomer 3 penetrates the partition 1; the length of the downcomer 3 above the partition 1 is 10-15% of the inner diameter of the packed tower, and the length of the downcomer 3 below the partition 1 is 20-30% of the inner diameter of the packed tower; one or two side holes 6 are machined on the side wall of the downcomer 3, close to the upper surface of the partition 1, and the diameter of the side holes 6 is 2-3 mm; the downcomer 3 is used for liquid redistribution.

[0031] The downcomer 3 has a wall thickness of 1-3 mm and an inner diameter of 5-10% of the inner diameter of the packed tower. In this embodiment, the downcomer 3 has a wall thickness of 1 mm, and the length of the portion of the downcomer 3 above the partition plate 1 is 15% of the inner diameter of the packed tower. Its function is to allow a certain amount of liquid to remain on the upper surface of the partition plate during the operation of the packed tower. Liquid sampling and measurement can be achieved by installing branch pipes at corresponding positions in the packed tower. The length of the portion of the downcomer 3 below the partition plate 1 is 25% of the inner diameter of the packed tower. The side hole 6 on the side wall of the downcomer 3 has a diameter of 2 mm. Its function is to allow the liquid on the upper surface of the partition plate 1 to flow down through the side hole 6 when the packed tower stops operating, thus preventing liquid accumulation in the distributor.

[0032] Working principle:

[0033] The inner wall of the packed tower is provided with several support platforms. The distributor is coaxially installed inside the packed tower and placed in the middle of two sections of packing material, and is located below the spray head of the packed tower. The distributor is supported on the support platforms by a partition 1. The partition 1 divides the internal space of the packed tower into upper and lower parts. The upper and lower parts of the internal space of the packed tower are connected by an air riser 2 and a downcomer 3. The partition 1 is in a horizontal state, and the axis of the downcomer 3 is in a vertical direction.

[0034] When the packed tower is running, the liquid sprayed from the spray head of the packed tower is guided by the baffle ring 2 and collected on the upper surface of the baffle 1. When the liquid level on the upper surface of the baffle 1 is higher than the top surface of the downcomer 3, the liquid stored on the upper surface of the baffle 1 flows down to the bottom of the packed tower through the downcomer 3. Since a certain amount of liquid is stored on the upper surface of the baffle 1, the liquid can be sampled and measured by installing branch pipes at the corresponding positions in the packed tower. In addition, during this process, since the diameter of the side hole 6 of the downcomer 3 is small, it does not affect the storage process of the liquid on the upper surface of the baffle 1.

[0035] When the packed tower stops operating, once the liquid level on the upper surface of the baffle plate is lower than or equal to the top surface of the downcomer 3, the liquid on the upper surface of the baffle plate flows down to the bottom of the packed tower through the side hole 6 of the downcomer 3, thus preventing liquid accumulation in the distributor.

[0036] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A redistributor for a small gas-liquid mass transfer packed tower, characterized in that, include: Baffles, riser pipes, downcomers, supports, and baffle rings; The partition is a circular plate; Two or more riser tubes are mounted on the partition, and the two or more riser tubes are evenly distributed along the circumference of the partition; each riser tube passes through the partition. The flow-blocking ring is a frustum-shaped shell with openings at both ends. The flow-blocking ring is fixed above the riser pipe by several supports, and the flow-blocking ring is coaxially distributed with the baffle. The small end of the flow-blocking ring faces upward and the large end faces downward, and the flow-blocking ring can completely cover the riser pipe in the vertical direction. The downcomer is coaxially installed at the center of the partition and penetrates the partition. The distributor is coaxially installed inside the packed tower via a partition, positioned between two sections of packing material. The partition divides the internal space of the packed tower into upper and lower parts. The upper and lower parts of the internal space of the packed tower are connected by a gas riser and a downcomer. The partition is horizontal, and the axis of the downcomer is vertical.

2. A redistributor for a small gas-liquid mass transfer packed tower as described in claim 1, characterized in that, One or two side holes are machined on the side wall of the downcomer, close to the upper surface of the partition plate.

3. A redistributor for a small gas-liquid mass transfer packed tower as described in claim 2, characterized in that, The length of the downcomer above the baffle is 10-15% of the inner diameter of the packed tower, and the length of the downcomer below the baffle is 20-30% of the inner diameter of the packed tower; the diameter of the side holes of the downcomer is 2-3 mm; the wall thickness of the downcomer is 1-3 mm, and the inner diameter of the downcomer is 5-10% of the inner diameter of the packed tower.

4. A redistributor for a small gas-liquid mass transfer packed tower as described in claim 1, characterized in that, The diameter of the baffle is 5-10% smaller than the inner diameter of the packed tower; the outer circumferential surface of the baffle is machined with a groove, and a fixing rubber ring is inserted into the groove.

5. A redistributor for a small gas-liquid mass transfer packed tower as described in claim 1, characterized in that, The inner diameter of each riser pipe is 20-30% of the inner diameter of the packed tower, and the wall thickness is 1-3mm. The distance between the center of the riser pipe and the center of the baffle is 20% of the inner diameter of the packed tower. The length of the riser pipe above the baffle is 20-30% of the inner diameter of the packed tower, and the length of the riser pipe below the baffle is 5-10% of the inner diameter of the packed tower.

6. A redistributor for a small gas-liquid mass transfer packed tower as described in any one of claims 1-5, characterized in that, The wall thickness of the baffle ring is 1-3mm, the inner diameter of the small end of the baffle ring is 10-20% of the inner diameter of the packed tower, the outer diameter of the large end of the baffle ring is 65-75% of the inner diameter of the packed tower, the angle between the generatrix of the baffle ring and the shaft is 50-70 degrees, and the distance between the large end of the baffle ring and the top of the riser pipe is 15-30mm.

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