A large-diameter pressure swing adsorption nitrogen purification tower

Abstract

This utility model relates to the technical field of nitrogen generation equipment, and in particular discloses a large-diameter pressure swing adsorption (PSA) nitrogen purification tower, including a purification tower body. The upper and lower ends of the purification tower body are respectively provided with an upper end cap and a lower end cap. An exhaust pipe and an inlet pipe are respectively connected to the upper and lower ends of the purification tower body. The upper end cap is connected to the exhaust pipe, and the lower end cap is connected to the inlet pipe. An umbrella-shaped upper gas distribution pipe assembly is connected to the gas distribution pipe. The upper end cap is filled with large-diameter carbon molecular sieves. The inlet pipe extends into the lower end cap, and an umbrella-shaped lower gas distribution pipe assembly is connected to the inlet pipe extending into the lower end cap. The lower end cap is filled with large-diameter carbon molecular sieves. The straight section of the purification tower body is filled with small-diameter carbon molecular sieves. This utility model ensures sufficient contact between high-flow compressed air and the adsorbent, improves adsorption efficiency, avoids fluidization phenomena, and effectively reduces the local impact of airflow on the molecular sieves and the penetration of the entire tower.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen production equipment technology, and in particular to a large-diameter pressure swing adsorption nitrogen production and purification tower. Background Technology

[0002] In the purification process of pressure swing adsorption (PSA) nitrogen generators, the equipment typically uses a parallel structure of two purification towers. Each tower is filled with carbon molecular sieve adsorbent, and the two towers alternately undergo pressure adsorption and decompression regeneration to separate nitrogen and oxygen, obtaining the required high-purity nitrogen. However, current purification tower structures are all small-scale, and the adsorbent used is a single-size carbon molecular sieve. With constantly changing market demands, the required nitrogen production volume is increasing, leading to a greater volume of compressed air entering the purification tower and a larger quantity of carbon molecular sieve adsorbent. To meet these demands, the inner diameter of the purification tower is becoming increasingly larger. The original small-scale purification tower structure, internal airflow distribution design, and molecular sieve adsorbent filling method no longer meet the requirements, accelerating molecular sieve fluidization, resulting in low molecular sieve utilization, and even causing localized impact and tower penetration within the molecular sieve. Therefore, the development of large-diameter purification towers is crucial to solving these technical problems.

[0003] Therefore, it is necessary to propose an improvement to overcome the shortcomings of the existing technology. Utility Model Content

[0004] The purpose of this invention is to solve the problems in the existing technology by providing a large-diameter pressure swing adsorption (PSA) nitrogen purification tower that addresses the issues of molecular sieve bed fluidization, localized impact on the molecular sieve, and overall tower penetration, resulting in low molecular sieve utilization.

[0005] The technical solution of this utility model is:

[0006] A large-diameter pressure swing adsorption (PSA) nitrogen purification tower includes a tower body with an upper end cap and a lower end cap at its upper and lower ends, respectively. An exhaust pipe and an inlet pipe are connected to the upper and lower ends of the tower body, respectively. The upper end cap is connected to the exhaust pipe, and the lower end cap is connected to the inlet pipe. An umbrella-shaped upper gas distribution pipe assembly is connected to the upper end cap, which is also connected to the exhaust pipe. The upper end cap is filled with large-diameter carbon molecular sieves. The inlet pipe extends into the lower end cap, and an umbrella-shaped lower gas distribution pipe assembly is connected to the inlet pipe extending into the lower end cap. The lower end cap is filled with large-diameter carbon molecular sieves. The straight section of the tower body is filled with small-diameter carbon molecular sieves.

[0007] As a preferred technical solution, the upper air distribution pipe assembly includes an upper single air distribution screen pipe and an upper double air distribution screen pipe. The air distribution cylinder has an upper air distribution hole, which is connected to the upper single air distribution screen pipe and the upper double air distribution screen pipe.

[0008] As a preferred technical solution, the lower air distribution pipe assembly includes a lower single air distribution screen pipe and a lower double air distribution screen pipe. The air inlet pipe extending into the lower end cap has a lower air distribution hole, which is connected to the lower single air distribution screen pipe and the lower double air distribution screen pipe.

[0009] As a preferred technical solution, the lower end of the purification tower body is provided with a supporting skirt.

[0010] As a preferred technical solution, the support skirt is provided with an inspection hole.

[0011] As a preferred technical solution, the support skirt is provided with vent holes.

[0012] As a preferred technical solution, the support skirt is provided with a reinforcing plate cylinder, and a fixing rib is provided inside the reinforcing plate cylinder, and the air intake pipe is fixed to the fixing rib.

[0013] As a preferred technical solution, the air intake pipe includes a horizontal first air intake pipe and a vertical second air intake pipe. The first air intake pipe is connected to the second air intake pipe. The air intake end of the first air intake pipe extends to the outside of the support skirt. The upper end of the second air intake pipe extends into the lower end cap. The lower end of the second air intake pipe is connected to a lower flange.

[0014] As a preferred technical solution, the upper end of the purification tower body is provided with an upper flange, and the upper flange is provided with an upper flange cover.

[0015] As a preferred technical solution, a coconut fiber gasket is provided between the upper flange cover and the upper end cap.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This utility model discloses a pressure swing adsorption (PSA) nitrogen purification tower. The tower body has an upper end cap, an exhaust pipe, a lower end cap, and an inlet pipe at its upper and lower ends, respectively. An air distribution cylinder is installed inside the upper end cap and connected to the exhaust pipe. An umbrella-shaped upper air distribution pipe assembly is connected to the air distribution cylinder. The upper end cap is filled with large-diameter carbon molecular sieves. The inlet pipe extends into the lower end cap and is connected to an umbrella-shaped lower air distribution pipe assembly. The lower end cap is filled with large-diameter carbon molecular sieves. The straight sections of the tower body are filled with small-diameter carbon molecular sieves. This design ensures sufficient contact between the high-flow-rate compressed air and the adsorbent, improving adsorption efficiency. It also minimizes fluidization caused by the impact of high-flow-rate compressed air on the molecular sieves, effectively reducing localized impact on the molecular sieves and overall tower penetration. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal structure of the large-diameter pressure swing adsorption nitrogen purification tower of this utility model;

[0019] Figure 2 This is a schematic diagram of the installation of the air intake pipe of this utility model;

[0020] Figure 3 This is a schematic diagram of the welding of the air intake pipe of this utility model.

[0021] In the diagram: 1. First air inlet pipe; 2. Second air inlet pipe; 3. Lower end cap; 4. Second lower air inlet pipe cover; 5. Lower flange; 6. Lower air distribution hole; 7. Lower single air distribution screen pipe; 8. Lower double air distribution screen pipe; 9. Lower air distribution pipe assembly; 10. Lower large-diameter carbon molecular sieve; 11. Purification tower body; 12. Small-diameter carbon molecular sieve; 13. First exhaust pipe; 14. Second exhaust pipe; 15. Upper air distribution hole; 16. Upper single air distribution screen pipe; 17. Upper air distribution pipe assembly; 18. Upper double air distribution screen pipe; 19. Upper end cap; 20. Upper large-diameter carbon molecular sieve; 21. Upper flange; 22. Upper flange cover; 23. Coconut fiber gasket; 24. Support skirt; 25. Exhaust hole; 26. Reinforcing plate body; 27. Fixing rib; 28. Air distribution cylinder; 29. ​​Inspection hole; 30. Support frame. Detailed Implementation

[0022] To make the technical means, technical features, utility model purpose and technical effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations.

[0023] Example 1

[0024] like Figure 1 The diagram shown is a schematic representation of the internal structure of the large-diameter pressure swing adsorption nitrogen purification tower of this invention.

[0025] The large-diameter pressure swing adsorption (PSA) nitrogen purification tower of this embodiment includes a purification tower body 11. A supporting skirt 24 is fixed to the lower end of the purification tower body 11, and a reinforcing plate body 26 is fixed on the supporting skirt 11. A fixing rib 27 is welded inside the reinforcing plate body 26. An exhaust pipe and an inlet pipe are fixed to the upper and lower sides of the purification tower body 11, respectively. The inlet pipe includes a horizontal first inlet pipe 1 and a vertical second inlet pipe 2. The inlet end of the first inlet pipe 1 is fixed to the fixing rib 27. The first inlet pipe 1 and the second inlet pipe 2 are connected to ensure the installation strength of the inlet pipe and the stability of the inlet pipe when high-pressure gas is blown in.

[0026] The purification tower body 11 has an upper end cap 19 and a lower end cap 3 fixed at its upper and lower ends, respectively. The upper end of the second air inlet pipe 2 extends into the lower end cap 3, and an air inlet pipe cover 4 is fixed to the upper end of the second air inlet pipe 2. The second air inlet pipe 2 has two layers of lower air distribution holes 6. A double-layer umbrella-type lower air distribution pipe assembly 9 is fixed inside the lower end cap 3. The lower air distribution pipe assembly 9 includes a lower single air distribution screen pipe 7 and a lower double air distribution screen pipe 8. In this embodiment, the number of lower air distribution holes 6 in both the upper and lower layers of the second air inlet pipe 2 is 8. The lower air distribution holes 6 are threadedly connected to 8 lower single air distribution screen pipes 7, and the upper air distribution holes 6 are connected to 4 lower single air distribution screen pipes 7 and 4 lower double air distribution screen pipes 8, respectively. The 4 lower single air distribution screen pipes 7 and 4 lower double air distribution screen pipes 8 are arranged in a cross pattern. A support frame 30 is welded between the upper double air distribution screen pipe 8 and the lower end cap 3. The two-layer umbrella-shaped gas distribution screen structure ensures more uniform gas flow distribution, reduces the impact of boundary layer effects, improves adsorbent utilization, and effectively reduces the local impact of gas flow on the molecular sieve and the penetration of the entire tower.

[0027] The lower end of the second air intake pipe 2 is connected to a detachable lower flange 5, which facilitates maintenance and purging of the inside of the air intake pipe, ensuring smooth intake of compressed air.

[0028] The lower head 3 is filled with a large-particle-size carbon molecular sieve 10, which is distributed between two layers of umbrella-shaped lower gas distribution pipe assemblies 9 inside the lower head 3. The straight pipe section of the purification tower body 11 is filled with a small-particle-size carbon molecular sieve 12, which ensures that the high-flow-rate compressed air and the character set are in full contact, improves the adsorption efficiency, and avoids fluidization phenomenon when the high-flow-rate compressed air impacts the molecular sieve to the greatest extent.

[0029] The exhaust pipe includes a first exhaust pipe 13 and a second exhaust pipe 14. The first exhaust pipe 13 and the second exhaust pipe 14 are connected by a flange. The first exhaust pipe 13 extends to the outside of the purification tower body 11. The second exhaust pipe 14 is connected to the upper end cap 19. An air distribution cylinder 28 is fixedly installed inside the upper end cap 19. The second exhaust pipe 14 is connected to the air distribution cylinder 28. The air distribution cylinder 28 has upper and lower layers of upper air distribution holes 15. An upper and lower layer of upper air distribution pipe assemblies 17 are fixed inside the upper end cap 19. The upper air distribution pipe assembly 17 includes an upper single air distribution screen 16 and an upper double air distribution screen 18. In this embodiment, there are 8 upper and lower layers of upper air distribution holes 15. The upper layer of upper air distribution holes 15 is threadedly connected to 8 upper single air distribution screens 16, and the lower layer of upper air distribution holes 15 is threadedly connected to 4 upper single air distribution screens 6 and 4 upper double air distribution screens 18, respectively.

[0030] In this embodiment, an upper flange 21 is installed at the top, and an upper flange cover 22 is fixed to the upper flange 21. The upper end cap 19 is filled with large-particle-size carbon molecular sieves 20. Two layers of coconut fiber pads 23 with a thickness of 80mm are fixedly installed between the upper end cap 19 and the upper flange cover 22 to compensate for the reasonable settling of the adsorbent bed, avoid the adsorbent from pulverizing, and improve the molecular sieve life.

[0031] Inspection holes 29 are provided on the support skirt 24 to facilitate personnel to enter the bottom of the tower for maintenance; exhaust holes 25 are provided on the support skirt 24 to ensure the stability of the large-diameter purification tower during its long service life.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent changes and modifications made in accordance with the scope of the claims of this utility model should fall within the technical scope of this utility model.

Claims

1. A large diameter pressure swing adsorption nitrogen generation purification column, characterized in that, The purification tower body (11) includes an upper end cap (19) and a lower end cap (3) at its upper and lower ends respectively. An exhaust pipe and an inlet pipe are connected to the upper and lower ends of the purification tower body (11) respectively. The upper end cap (19) is connected to the exhaust pipe, and the lower end cap (3) is connected to the inlet pipe. An air distribution cylinder (28) is provided inside the upper end cap (19). The air distribution cylinder (28) is connected to the exhaust pipe. An umbrella-shaped upper air distribution pipe assembly (17) is connected to the air distribution cylinder (28). The upper end cap (19) is filled with upper large-diameter carbon molecular sieve (20). The inlet pipe extends into the lower end cap (3). An umbrella-shaped lower air distribution pipe assembly (9) is connected to the inlet pipe extending into the lower end cap (3). The lower end cap (3) is filled with lower large-diameter carbon molecular sieve (10). The straight section of the purification tower body (11) is filled with small-diameter carbon molecular sieve.

2. The large diameter pressure swing adsorption nitrogen generation purification column of claim 1, wherein, The upper air distribution pipe assembly (17) includes an upper single air distribution screen pipe (16) and an upper double air distribution screen pipe (18). An upper air distribution hole (15) is provided on the air distribution cylinder (28), and the upper air distribution hole (15) is connected to the upper single air distribution screen pipe (16) and the upper double air distribution screen pipe (18).

3. The large diameter pressure swing adsorption nitrogen generation purification column of claim 1, wherein, The lower air distribution pipe assembly (9) includes a lower single air distribution screen pipe (7) and a lower double air distribution screen pipe (8). The air inlet pipe extending into the lower end cap (3) is provided with a lower air distribution hole (6), which is connected to the lower single air distribution screen pipe (7) and the lower double air distribution screen pipe (8).

4. The large diameter pressure swing adsorption nitrogen generation purification column of claim 1, wherein, The lower end of the purification tower body (11) is provided with a support skirt (24).

5. The large-diameter pressure swing adsorption nitrogen purification tower according to claim 4, characterized in that, An inspection hole (29) is provided on the support skirt (24).

6. The large diameter pressure swing adsorption nitrogen generation purification column of claim 4, wherein, The support skirt (24) is provided with an exhaust hole (25).

7. The large diameter pressure swing adsorption nitrogen generation purification column of claim 4, wherein, The supporting skirt (24) is provided with a reinforcing plate cylinder (26), and a fixing rib (27) is provided inside the reinforcing plate cylinder (26). The air inlet pipe is fixed on the fixing rib (27).

8. The large diameter pressure swing adsorption nitrogen generation purification column of claim 4, wherein, The air intake pipe includes a horizontal first air intake pipe (1) and a vertical second air intake pipe (2). The first air intake pipe (1) is connected to the second air intake pipe (2). The air intake end of the first air intake pipe (1) extends to the outside of the support skirt (24). The upper end of the second air intake pipe (2) extends into the lower end cap (3). The lower end of the second air intake pipe (2) is connected to a lower flange (5).

9. The large diameter pressure swing adsorption nitrogen generation purification column of claim 1, wherein, The upper end of the purification tower body (11) is provided with an upper flange (21), and an upper flange cover (22) is provided on the upper flange (21).

10. The large diameter pressure swing adsorption nitrogen generation purification column of claim 9, wherein, A coconut fiber pad (23) is provided between the upper flange cover (22) and the upper end cap (19).

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