Falling film distributor for falling film absorber

Abstract

A falling film distributor for a falling film absorber comprises a falling film assembly connected with the upper end of a SiC tube, the SiC tube is arranged on a tube plate in a penetrating mode, a tube box is arranged above the tube plate, an end socket is arranged above the tube box, the falling film assembly is arranged in the tube box, a gas inlet and a liquid inlet are formed in the end socket, a gas-liquid distributor is arranged between the end socket and the tube box, and the gas-liquid distributor is arranged in the tube box. The gas-liquid distributor comprises a circular plate, a plurality of downcomers and a plurality of gas phase channel groups are arranged on the circular plate, each gas phase channel group comprises a plurality of fan-shaped gas phase channels, a liquid inlet pipe is arranged in the liquid inlet in a penetrating manner, and a liquid outlet of the liquid inlet pipe is arranged above the middle part of the circular plate. According to the utility model, liquid and gas are distributed by the gas-liquid distributor and then enter the periphery of the falling film component, so that the uniform distribution of the liquid and the gas is ensured. The falling film assembly is optimized, different channels are arranged for operation of a gas phase and a liquid phase respectively, and the operation stability is improved while the film forming effect is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of falling film absorbers, and in particular relates to a falling film distributor for a falling film absorber. Background Art

[0002] At present, SiC falling film absorber has the advantages of good corrosion resistance, high heat transfer efficiency and stable operation, and is widely used in the chemical industry, especially in processes with obvious absorption heat effect. However, conventional falling film absorbers are mostly peripheral feed, and when the distribution density of heat exchange tubes is large, it will cause inconsistent liquid level above the tube sheet, affecting the distribution effect of the falling film component. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the technical solution adopted by the utility model is: a falling film distributor for a falling film absorber, including a falling film assembly connected to the upper end of a SiC tube, the SiC tube is inserted into a tube sheet, a tube box is arranged above the tube sheet, a head is arranged above the tube box, the falling film assembly is arranged in the tube box, an air inlet and a liquid inlet are arranged on the head, a gas-liquid distributor is arranged between the head and the tube box, the gas-liquid distributor includes a circular plate, a plurality of liquid drop ports and a plurality of gas phase channel groups are arranged on the circular plate, each gas phase channel group includes a plurality of fan-shaped gas phase channels, a liquid inlet pipe is inserted in the liquid inlet, and a liquid outlet of the liquid inlet pipe is arranged above the middle of the circular plate.

[0005] There are four gas phase channel groups in total.

[0006] Each group of gas phase channels comprises three fan-shaped gas phase channels, which are arranged in sequence and spaced apart along the radial direction of the circular plate, and a downcomer is arranged between two adjacent gas phase channels.

[0007] The falling film assembly includes a fastening nut, a distribution nut, a distribution column and a liquid blocking cap. The distribution nut is provided with a second liquid inlet, and the distribution column is provided with a second air inlet. The upper end of the fastening nut is connected to the distribution nut, and the lower end of the fastening nut is connected to the SiC tube. The upper end of the distribution column is inserted into the middle of the distribution nut, the upper end of the distribution column is connected to the liquid blocking cap, and the lower end of the distribution column extends into the SiC tube.

[0008] Compared with the prior art, the utility model has the following beneficial effects: in the utility model, liquid and gas are distributed through a gas-liquid distributor before entering the periphery of the falling film assembly, thereby ensuring uniform distribution of liquid and gas. By optimizing the falling film assembly, different channel operations are respectively set for the gas phase and the liquid phase, thereby improving the stability of operation while ensuring the film forming effect. A liquid retaining cap is set outside the gas phase inlet of the falling film assembly, and the gas first enters the annular channel formed by the inner wall of the liquid retaining cap and the outer wall of the distribution column before entering the air inlet, which can greatly reduce the gas phase entraining the liquid phase into the heat exchange tube, thereby improving the heat exchange effect and operation stability of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model;

[0010] Figure 2 is a schematic diagram of the structure of a falling film assembly;

[0011] Figure 3 is a schematic diagram of the cross-sectional structure of a falling film assembly;

[0012] Figure 4 is a top view of the gas-liquid distributor;

[0013] Figure 5 It is a schematic diagram of the three-dimensional structure of the gas-liquid distributor. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0015] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details.

[0016] See also Figure 1 to Figure 5A falling film distributor for a falling film absorber comprises a falling film assembly 5 connected to the upper end of a SiC tube 4, the SiC tube 4 is penetrated on a tube sheet 3, a tube box 2 is arranged above the tube sheet 2, a head 1 is arranged above the tube box 2, the falling film assembly 5 is arranged in the tube box 2, a gas inlet 101 and a liquid inlet 102 are arranged on the head 1, a gas-liquid distributor 6 is arranged between the head 1 and the tube box 2, the gas-liquid distributor 6 comprises a circular plate 603, a plurality of liquid drop ports 601 and a plurality of gas phase channel groups are arranged on the circular plate 603, each gas phase channel group comprises a plurality of fan-shaped gas phase channels 602, a liquid inlet pipe 103 is penetrated in the liquid inlet 102, and a liquid outlet of the liquid inlet pipe 103 is arranged above the middle of the circular plate 603.

[0017] There are four gas phase channel groups in total.

[0018] Each group of gas phase channels includes three fan-shaped gas phase channels 602 . The three fan-shaped gas phase channels 602 are arranged in sequence and spaced apart along the radial direction of the circular plate 603 . A downcomer 601 is arranged between two adjacent gas phase channels 602 .

[0019] The falling film assembly 5 includes a fastening nut 501, a distribution nut 502, a distribution column 503 and a liquid blocking cap 504. The distribution nut 502 is provided with a second liquid inlet 505, and the distribution column 503 is provided with a second air inlet 506. The upper end of the fastening nut 501 is connected to the distribution nut 502, and the lower end of the fastening nut 501 is connected to the SiC tube 4. The upper end of the distribution column 503 is penetrated in the middle of the distribution nut 502, the upper end of the distribution column 503 is connected to the liquid blocking cap 504, and the lower end of the distribution column 503 extends into the SiC tube 4.

[0020] The liquid enters the tube box 2 through the liquid downcomer 601, and the gas enters the tube box 2 through the gas phase channel 602. Then the liquid enters the annular space formed by the inner wall of the distribution nut and the outer wall of the distribution column through the second liquid inlet 505, so that the liquid flows along the tube wall of the SiC tube 4, and the gas enters the second gas inlet 506 through the annular space formed by the inner wall of the liquid retaining cap and the outer wall of the distribution column, and then enters the middle part of the SiC tube 4 through the middle channel of the distribution column, and exchanges heat and substances with the liquid on the tube wall.

[0021] In the utility model, liquid and gas are distributed through a gas-liquid distributor before entering the periphery of the falling film assembly, thereby ensuring uniform distribution of liquid and gas. By optimizing the falling film assembly, different channel operations are set for the gas phase and the liquid phase, respectively, thereby improving the stability of operation while ensuring the film forming effect. A liquid retaining cap is set outside the gas phase inlet of the falling film assembly, and the gas first enters the annular channel formed by the inner wall of the liquid retaining cap and the outer wall of the distribution column before entering the air inlet, which can greatly reduce the gas phase entraining the liquid phase into the heat exchange tube, thereby improving the heat exchange effect and operation stability of the heat exchange tube.

Claims

1. A falling film distributor for a falling film absorber, comprising a falling film assembly (5) connected to the upper end of a SiC tube (4), the SiC tube (4) being inserted into a tube sheet (3), a tube box (2) being arranged above the tube sheet (3), a head (1) being arranged above the tube box (2), the falling film assembly (5) being arranged in the tube box (2), the head (1) being provided with an air inlet (101) and a liquid inlet (102), characterized in that: A gas-liquid distributor (6) is arranged between the sealing head (1) and the pipe box (2), and the gas-liquid distributor (6) comprises a circular plate (603), and a plurality of liquid droppers (601) and a plurality of gas phase channel groups are arranged on the circular plate (603), and each gas phase channel group comprises a plurality of fan-shaped gas phase channels (602), and a liquid inlet pipe (103) is passed through the liquid inlet (102), and a liquid outlet of the liquid inlet pipe (103) is arranged above the middle of the circular plate (603).

2. A falling film distributor for a falling film absorber according to claim 1, characterized in that: There are four gas phase channel groups in total.

3. The falling film distributor for a falling film absorber according to claim 1, characterized in that: Each group of gas phase channels comprises three fan-shaped gas phase channels (602), and the three fan-shaped gas phase channels (602) are arranged in sequence and spaced apart along the radial direction of the circular plate (603), and a downcomer (601) is arranged between two adjacent gas phase channels (602).

4. The falling film distributor for a falling film absorber according to claim 1, characterized in that: The falling film assembly (5) comprises a fastening nut (501), a distribution nut (502), a distribution column (503) and a liquid retaining cap (504); the distribution nut (502) is provided with a second liquid inlet (505); the distribution column (503) is provided with a second air inlet (506); the upper end of the fastening nut (501) is connected to the distribution nut (502); the lower end of the fastening nut (501) is connected to the SiC tube (4); the upper end of the distribution column (503) is inserted into the middle of the distribution nut (502); the upper end of the distribution column (503) is connected to the liquid retaining cap (504); and the lower end of the distribution column (503) extends into the SiC tube (4).

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