Pressure swing adsorption molecular sieve screening device

Abstract

The invention relates to the technical field of molecular sieve and dust separation, in particular to a pressure swing adsorption molecular sieve screening device which is characterized in that the upper end of a screening pipe is connected with the upper end of a dust conveying pipe, and the lower end of the dust conveying pipe is connected with the lower end of a primary dust collecting pipe; a plurality of air supply branch pipes are arranged in the lower portion of the screening pipe, a feeding port is formed in one side of the upper portion of the screening pipe and connected with a feeding hopper, the feeding hopper is connected with a feeding pipe, and a transverse dispersing device and a longitudinal dispersing device are arranged on the inclined face in the feeding hopper. And a screen is arranged in the screening pipe, and the screen is arranged between the feeding port and the air supply branch pipe. The air supply branch pipe on the lower portion of the screening pipe provides airflow into the screening pipe and is used for separating dust and a molecular sieve; the device is used for regularly screening and removing pulverized molecular sieve particles, so that the requirement of frequent replacement caused by aging and crushing of the molecular sieve is reduced, the production cost is reduced, and the oxygen production efficiency and the product quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of molecular sieve and dust separation, and in particular to a pressure swing adsorption molecular sieve screening device. Background Art

[0002] In the pressure swing adsorption oxygen production process, molecular sieves are core components, and their performance is directly related to oxygen production efficiency and product quality. As the molecular sieve ages, some particles gradually break and pulverize due to friction caused by air flow within the adsorption tower and the aging of the molecular sieve itself. These pulverized particles not only reduce the air flow capacity within the adsorption tower and increase the air supply resistance of the centrifugal fan, but may also enter subsequent processes with the airflow, affecting product quality. Furthermore, the pulverization of the molecular sieve leads to a decrease in adsorption capacity, thereby affecting oxygen production efficiency and stability. To address this issue, the traditional approach is to regularly clean the adsorption tower and replace the molecular sieve. However, this method is not only cumbersome but also costly. Summary of the Invention

[0003] In response to the problem in the above-mentioned prior art that molecular sieve pulverization affects oxygen production efficiency and product quality, the present invention provides a pressure swing adsorption molecular sieve screening device, which uses dry compressed air to blow up the dust in the molecular sieve in the opposite direction of the molecular sieve's fall to achieve separation of the molecular sieve and the dust, thereby increasing oxygen production and reducing production costs.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A pressure swing adsorption molecular sieve screening device, comprising a screening tube, a dust conveying tube, and a primary dust collecting tube; the upper end of the screening tube is connected to the upper end of the dust conveying tube, and the lower end of the dust conveying tube is connected to the lower end of the primary dust collecting tube; the screening tube is a vertically arranged pipe, and the lower end of the screening tube is provided with a discharge port; the lower part of the screening tube is provided with a plurality of air supply branches inside, and the air supply pipe is provided with a plurality of air supply nozzles, and the plurality of air supply branches are connected to the air supply main pipeline; a feed port is provided on one side of the upper part of the screening tube, and the feed port is provided on the upper part of the screening tube. The material port is connected to the feed hopper, the feed hopper is connected to the feed pipe, the lower surface of the feed hopper is an inclined surface, and the inclined surface inside the feed hopper is provided with a horizontal dispersion device and a vertical dispersion device; the inside of the screening tube is provided with a screen, and the screen is arranged between the material port and the air supply branch pipe; the lower end of the primary dust collecting pipe is provided with a primary dust collecting port, and the upper end is provided with an air supply riser, the air supply riser is covered with a conveying pipe, there is a gap between the conveying pipe and the air supply riser, and the conveying pipe is connected to the dust collecting bag.

[0006] Furthermore, it also includes an air supply pipeline, one end of which is connected to the air supply main pipeline, and the other end is connected to the discharge port; a first flow regulating valve is provided on the air supply main pipeline, and a second flow regulating valve is provided on the air supply pipeline.

[0007] Furthermore, both ends of the dust conveying pipe are beveled, the end of the dust conveying pipe with a larger bevel angle is connected to the primary dust collecting pipe, and the end of the dust conveying pipe with a smaller bevel angle is connected to the screening pipe.

[0008] Furthermore, the cross-sectional area of the interface between the dust conveying duct and the primary dust collecting duct is 2-3 times the cross-sectional area of the interface between the dust conveying duct and the screening duct.

[0009] Furthermore, two layers of the air supply branch pipes are provided inside the screening tube, and the two layers of the air supply branch pipes are arranged in one layer in a transverse direction and in the other layer in a longitudinal direction.

[0010] Furthermore, the transverse dispersing device and the longitudinal dispersing device are stainless steel rods.

[0011] Furthermore, the angle between the screen and the horizontal direction is 45-55°.

[0012] Furthermore, a mechanical vibration device is provided on the screen.

[0013] Furthermore, a dust collection control valve is provided at the primary dust collection port.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention provides a pressure swing adsorption molecular sieve screening device. By arranging a horizontal dispersion device and a vertical dispersion device inside a feed hopper, it is ensured that the molecular sieve particles entering the screening tube are fully dispersed, and local accumulation of the molecular sieve in the screening tube is avoided, thereby improving the efficiency and uniformity of screening; an air supply branch pipe at the lower part of the screening tube provides airflow to the inside of the screening tube for separating dust and molecular sieve, and at the same time, the airflow also has a flushing effect on the surface of the molecular sieve to further promote the separation of pulverized particles; the screen can reduce the falling speed of the molecular sieve, and avoid the problem of short purge time and insufficient purge caused by the sudden fall of a large amount of molecular sieve; the device is used to regularly screen and remove pulverized molecular sieve particles, thereby reducing the need for frequent replacement due to aging and breakage of the molecular sieve, reducing production costs, and improving oxygen production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The embodiments of the present invention are further described below with reference to the accompanying drawings, in which:

[0017] Figure 1 A schematic structural diagram of an embodiment of a pressure swing adsorption molecular sieve screening device is shown;

[0018] Figure 2 A top view of an embodiment of a gas supply manifold is shown;

[0019] Figure 3 A schematic diagram of the feed hopper is shown;

[0020] Figure 4 A front cross-sectional view of the feed hopper is shown;

[0021] Figure 5 A cross-sectional view of the feed hopper is shown;

[0022] Figure identification: 101-screening pipe, 102-dust conveying pipe, 103-primary dust collecting pipe, 104-conveying pipe, 105-discharge port, 106-air supply pipe, 107-second flow regulating valve, 201-air supply main pipe, 202-air supply branch pipe, 203-air supply nozzle, 204-first flow regulating valve, 301-feed pipe, 302-feed hopper, 303-horizontal dispersion device, 304-vertical dispersion device, 305-screen, 401-primary dust collecting port, 402-air supply riser, 403-dust collection control valve. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Reference Attachment Figure 1-3 A pressure swing adsorption molecular sieve screening device includes a screening tube 101, a dust conveying tube 102, and a primary dust collecting tube 103; the upper end of the screening tube 101 is connected to the upper end of the dust conveying tube 102, and the lower end of the dust conveying tube 102 is connected to the lower end of the primary dust collecting tube 103; the screening tube 101 is a vertically arranged pipeline, and a discharge port 105 is provided at the lower end of the screening tube 101; a plurality of air supply branch pipes 202 are provided inside the lower part of the screening tube 101, and a plurality of air supply nozzles 203 are provided on the air supply pipe 202, and the plurality of air supply branch pipes 202 are connected to the air supply main pipeline 201; a feed port is provided on one side of the upper part of the screening tube 101, and the feed port is connected to the feed hopper 302, The feed hopper 302 is connected to the feed pipe 301, and the lower surface of the feed hopper 302 is an inclined surface. The inclined surface inside the feed hopper 302 is provided with a horizontal dispersion device 303 and a vertical dispersion device 304; the inside of the screening tube 101 is provided with a screen 305, and the screen 305 is arranged between the feed port and the air supply branch pipe 202; the lower end of the primary dust collecting tube 103 is provided with a primary dust collecting material port 401, and the upper end is provided with an air supply riser 402, and the air supply riser 402 is covered with a conveying pipe 104, and there is a gap between the conveying pipe 104 and the air supply riser 402, which is convenient for observing the gas flow rate inside the primary dust collecting tube 103; the conveying pipe 104 is connected to the dust collecting bag.

[0025] In one embodiment of the present invention, it also includes an air supply pipeline 106, one end of the air supply pipeline 106 is connected to the main air supply pipeline 201, and the other end is connected to the discharge port 105; a first flow regulating valve 204 is provided on the main air supply pipeline 201, and a second flow regulating valve 107 is provided on the air supply pipeline 106; when the device is working, a negative pressure will be formed under the air supply branch pipe 202, and the material collection bag connected to the discharge port 105 will be closed due to the pressure, which is not conducive to collecting the separated molecular sieve. The air supply pipeline 106 introduces gas into the material collection bag to open the material collection bag to facilitate the collection of the molecular sieve.

[0026] In one embodiment of the present invention, both ends of the dust conveying pipe 102 are beveled, the end of the dust conveying pipe 102 with a larger bevel angle is connected to the primary dust collecting pipe 103, and the end of the dust conveying pipe 102 with a smaller bevel angle is connected to the screening pipe 101; the larger the bevel angle, the larger the interface cross-section of the pipe, which is conducive to reducing the flow rate of dust and facilitating the sedimentation of dust.

[0027] In one embodiment of the present invention, the cross-sectional area of the interface between the dust conveying duct 102 and the primary dust collecting duct 103 is 2-3 times the cross-sectional area of the interface between the dust conveying duct 102 and the screening duct 101 .

[0028] In one embodiment of the present invention, two layers of gas supply branch pipes 202 are provided inside the screen pipe 101 , wherein one layer of the gas supply branch pipes 202 is arranged horizontally and the other layer is arranged vertically.

[0029] In one embodiment of the present invention, the transverse dispersing device 303 and the longitudinal dispersing device 304 are stainless steel rods. When the molecular sieve enters the feed hopper 302, the transverse dispersing device 303 and the longitudinal dispersing device 304 provide collision or resistance for the molecular sieve, causing the molecular sieve to diffuse, thereby avoiding the falling area being too concentrated, resulting in insufficient air source in the area and unsatisfactory screening.

[0030] In one embodiment of the present invention, the angle between the screen 305 and the horizontal direction is 45-55 degrees. The screen 305 can reduce the falling speed of the molecular sieve, avoiding the problem of short purge time and insufficient purge caused by the sudden fall of a large amount of molecular sieve.

[0031] In one embodiment of the present invention, a mechanical rapping device is provided on the screen 305 .

[0032] In one embodiment of the present invention, a dust collection control valve 403 is provided at the primary dust collection port 401 .

[0033] During use, the molecular sieve enters the feed hopper 302 from the feed pipe 301, and the molecular sieve falls evenly into the sieve tube 101 under the action of the horizontal dispersion device 303 and the vertical dispersion device 304. Under the action of the airflow, the light dust is transported to the dust conveying pipe 102 by the gas for subsequent sedimentation and collection. The molecular sieve falls under the action of gravity and is finally discharged from the discharge port 105.

[0034] The present invention provides a pressure swing adsorption molecular sieve screening device. By arranging a horizontal dispersion device and a vertical dispersion device inside a feed hopper, it is ensured that the molecular sieve particles entering the screening tube are fully dispersed, and local accumulation of the molecular sieve in the screening tube is avoided, thereby improving the efficiency and uniformity of screening; an air supply branch pipe at the lower part of the screening tube provides airflow to the inside of the screening tube for separating dust and molecular sieve, and at the same time, the airflow also has a flushing effect on the surface of the molecular sieve to further promote the separation of pulverized particles; the screen can reduce the falling speed of the molecular sieve, and avoid the problem of short purge time and insufficient purge caused by the sudden fall of a large amount of molecular sieve; the device is used to regularly screen and remove pulverized molecular sieve particles, thereby reducing the need for frequent replacement due to aging and breakage of the molecular sieve, reducing production costs, and improving oxygen production efficiency and product quality.

[0035] Some exemplary embodiments of the present invention are described above. It will be understood that the above embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention. The features in these embodiments can be recombined in an appropriate manner, and the solutions obtained thereby are still within the scope of protection claimed by the present invention. Based on the above embodiments, all other embodiments obtained by those skilled in the art without making creative work, that is, all modifications, equivalent substitutions and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by the present invention.

Claims

1. A pressure swing adsorption molecular sieve screening device, characterized in that: The invention comprises a screening pipe (101), a dust conveying pipe (102), and a primary dust collecting pipe (103); the upper end of the screening pipe (101) is connected to the upper end of the dust conveying pipe (102), and the lower end of the dust conveying pipe (102) is connected to the lower end of the primary dust collecting pipe (103); the screening pipe (101) is a vertically arranged pipe, and the lower end of the screening pipe (101) is provided with a discharge port (105); a plurality of air supply branch pipes (202) are provided inside the lower part of the screening pipe (101), a plurality of air supply nozzles (203) are provided on the air supply pipe (202), and the plurality of air supply branch pipes (202) are connected to the air supply main pipe (201); a feed port is provided on one side of the upper part of the screening pipe (101), and the feed port is connected to the feed hopper (302) The feed hopper (302) is connected to the feed pipe (301), the lower surface of the feed hopper (302) is an inclined surface, and the inclined surface inside the feed hopper (302) is provided with a transverse dispersion device (303) and a longitudinal dispersion device (304); the screen (305) is provided inside the screening tube (101), and the screen (305) is arranged between the feed port and the air supply branch pipe (202); the lower end of the primary dust collecting pipe (103) is provided with a primary dust collecting port (401), and the upper end is provided with an air supply riser (402), the air supply riser (402) is covered with a conveying pipe (104), there is a gap between the conveying pipe (104) and the air supply riser (402), and the conveying pipe (104) is connected to a dust collecting bag.

2. A pressure swing adsorption molecular sieve screening device according to claim 1, characterized in that: The invention also comprises an air supply pipeline (106), one end of which is connected to the main air supply pipeline (201), and the other end is connected to the discharge port (105); a first flow regulating valve (204) is provided on the main air supply pipeline (201), and a second flow regulating valve (107) is provided on the air supply pipeline (106).

3. A pressure swing adsorption molecular sieve screening device according to claim 1, characterized in that: The dust conveying pipe (102) has two ends beveled, the end of the dust conveying pipe (102) with a larger bevel angle is connected to the primary dust collecting pipe (103), and the end of the dust conveying pipe (102) with a smaller bevel angle is connected to the screening pipe (101).

4. A pressure swing adsorption molecular sieve screening device according to claim 3, characterized in that: The cross-sectional area of the interface between the dust conveying pipe (102) and the primary dust collecting pipe (103) is 2-3 times the cross-sectional area of the interface between the dust conveying pipe (102) and the screening pipe (101).

5. The pressure swing adsorption molecular sieve screening device according to claim 1, characterized in that: Two layers of the air supply branch pipes (202) are provided inside the screening pipe (101), and the two layers of the air supply branch pipes (202) are arranged in a horizontal direction on one layer and in a vertical direction on the other layer.

6. The pressure swing adsorption molecular sieve screening device according to claim 1, characterized in that: The transverse dispersing device (303) and the longitudinal dispersing device (304) are stainless steel rods.

7. The pressure swing adsorption molecular sieve screening device according to claim 1, characterized in that: The angle between the screen (305) and the horizontal direction is 45-55 degrees.

8. A pressure swing adsorption molecular sieve screening device according to claim 1 or 7, characterized in that: The screen (305) is provided with a mechanical rapping device.

9. The pressure swing adsorption molecular sieve screening device according to claim 1, characterized in that: A dust collection control valve (403) is provided at the primary dust collection port (401).

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