Novel pressure swing adsorption type nitrogen making machine

Abstract

The utility model discloses a novel pressure swing adsorption type nitrogen making machine which comprises a base, a left adsorption tower and a right adsorption tower are fixedly installed on the base, bottom plates are arranged in the left adsorption tower and the right adsorption tower, a first carbon molecular sieve is arranged on the base, a cover plate is installed on the upper portion of the left adsorption tower and the upper portion of the right adsorption tower, and a second carbon molecular sieve is arranged on the cover plate. A second carbon molecular sieve is fixedly mounted at the lower part of the cover plate, a gap is reserved between the upper end of the first carbon molecular sieve and the cover plate, and a gap is reserved between the bottom of the second carbon molecular sieve and the bottom plate; a three-way valve is connected between the left adsorption tower and the right adsorption tower, and a control valve is connected between the cover plates on the two sides. By means of the airflow channel formed by the first carbon molecular sieve and the second carbon molecular sieve, air can make full contact with the first carbon molecular sieve and the second carbon molecular sieve, and the oxygen molecule curing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen generators, in particular to a novel pressure swing adsorption nitrogen generator. Background Art

[0002] Pressure swing adsorption (PSA) is a new gas separation technology, the principle of which is to separate gas mixtures by utilizing the differences in the "adsorption" properties of molecular sieves to different gas molecules.

[0003] Pressure swing adsorption nitrogen production uses air as raw material and uses a high-efficiency, highly selective solid adsorbent to separate nitrogen and oxygen from the air by selectively adsorbing nitrogen and oxygen. The separation of nitrogen and oxygen by carbon molecular sieve is mainly based on the different diffusion rates of the two gases on the surface of the carbon molecular sieve. Gases with smaller diameters (oxygen) diffuse faster and enter the molecular sieve solid phase more. In this way, nitrogen enrichment components can be obtained in the gas phase. After a period of time, the molecular sieve's adsorption of oxygen reaches equilibrium. According to the characteristics of the carbon molecular sieve's different adsorption amounts of adsorbed gas under different pressures, the pressure is reduced to release the carbon molecular sieve from oxygen adsorption. This process is called regeneration. The pressure swing adsorption method usually uses two towers in parallel, alternating between pressurized adsorption and decompression regeneration to obtain a continuous nitrogen flow.

[0004] However, when the existing technology is used, there are common problems such as insufficient contact between air and molecular sieve, inability to fully solidify oxygen in the air by the molecular sieve, and reduced work efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a novel pressure swing adsorption nitrogen generator, which has the advantages of enabling air to fully contact with the first carbon molecular sieve and the second carbon molecular sieve through the air flow channel formed by the first carbon molecular sieve and the second carbon molecular sieve, thereby improving the curing efficiency of oxygen molecules and the like, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A novel pressure swing adsorption nitrogen generator comprises a base, a left adsorption tower and a right adsorption tower are fixedly mounted on the base, a bottom plate is placed inside the left adsorption tower and the right adsorption tower, a first carbon molecular sieve is provided on the base, a cover plate is mounted on the upper part of the left adsorption tower and the right adsorption tower, a second carbon molecular sieve is fixedly mounted on the lower part of the cover plate, a gap is left between the upper end of the first carbon molecular sieve and the cover plate, and a gap is left between the bottom of the second carbon molecular sieve and the bottom plate;

[0008] A three-way valve is connected between the left adsorption tower and the right adsorption tower, and a control valve is connected between the cover plates on both sides.

[0009] Preferably, a crossbeam is welded in the middle of the base, support columns are welded on the sides of the base and the crossbeam, and the left adsorption tower and the right adsorption tower are welded on the support columns.

[0010] Preferably, one side of the left adsorption tower is connected to a first feed pipe, one side of the right adsorption tower is connected to a second feed pipe, and both the first feed pipe and the second feed pipe are connected to the lower part of one side of the first carbon molecular sieve.

[0011] Preferably, the three-way valve and the first feed pipe and the second feed pipe are connected via a first connecting flange and a first fixing bolt, and a rotating handwheel is provided on the three-way valve.

[0012] Preferably, the cover plates on both sides are connected with pressure equalizing tubes, and the pressure equalizing tubes are connected between the second carbon molecular sieve and the first carbon molecular sieve.

[0013] Preferably, the pressure equalizing pipes on both sides are connected to the control valve via a second flange and a second fixing bolt.

[0014] Preferably, the cover plates on both sides are connected with discharge pipes respectively, and the discharge pipes are respectively connected to one side of the second carbon molecular sieve.

[0015] Preferably, the left adsorption tower and the right adsorption tower are fixedly connected to the cover plate via a third flange and a third fixing bolt.

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

[0017] When the utility model is in use, a first carbon molecular sieve and a second carbon molecular sieve are arranged inside a left adsorption tower and a right adsorption tower, and a gap is left between the upper end of the first carbon molecular sieve and the cover plate, and a gap is left between the bottom of the second carbon molecular sieve and the bottom plate, so that an airflow channel can be formed between the left adsorption tower and the right adsorption tower, so that the airflow can fully contact with the first carbon molecular sieve and the second carbon molecular sieve, so that oxygen in the airflow can be fully absorbed, and the absorption efficiency is improved, and the air supply direction is realized between the left adsorption tower and the right adsorption tower through a three-way valve, so that the airflow is conveniently transported to the inside of the left adsorption tower or the right adsorption tower respectively, and the pressure equalization treatment between the left adsorption tower and the right adsorption tower is realized through a control valve to realize desorption treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the top view structure of the utility model;

[0019] Figure 2 It is a side view structural schematic diagram of the utility model;

[0020] Figure 3 It is a cross-sectional structural schematic diagram of the utility model;

[0021] Figure 4 It is a partial structural schematic diagram of the utility model.

[0022] In the figure: 1. base; 2. left adsorption tower; 3. right adsorption tower; 4. first feed pipe; 5. second feed pipe; 6. three-way valve; 7. rotating hand wheel; 8. first carbon molecular sieve; 9. second carbon molecular sieve; 10. cover plate; 11. pressure equalizing tube; 12. control valve; 13. bottom plate; 14. discharge pipe; 15. second flange; 16. second fixing bolt; 17. first connecting flange; 18. first fixing bolt; 19. support column; 20. third flange; 21. third fixing bolt; 22. crossbeam. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-4 , the utility model provides a technical solution:

[0025] A novel pressure swing adsorption nitrogen generator comprises a base 1, on which a left adsorption tower 2 and a right adsorption tower 3 are fixedly mounted, a bottom plate 13 is placed inside the left adsorption tower 2 and the right adsorption tower 3, the base 1 is provided with a first carbon molecular sieve 8, a cover plate 10 is installed on the upper part of the left adsorption tower 2 and the right adsorption tower 3, a second carbon molecular sieve 9 is fixedly mounted on the lower part of the cover plate 10, a gap is left between the upper end of the first carbon molecular sieve 8 and the cover plate 10, and a gap is left between the bottom of the second carbon molecular sieve 9 and the bottom plate 13;

[0026] A three-way valve 6 is connected between the left adsorption tower 2 and the right adsorption tower 3 , and a control valve 12 is connected between the cover plates 10 at both sides.

[0027] In order to achieve the installation and fixation of the left adsorption tower 2 and the right adsorption tower 3 and maintain stability, in the present embodiment, preferably, a cross beam 22 is welded in the middle of the base 1, and support columns 19 are welded on the sides of the base 1 and the cross beam 22, and the left adsorption tower 2 and the right adsorption tower 3 are both welded on the support columns 19.

[0028] In order to supply gas to the left adsorption tower 2 and the right adsorption tower 3 respectively, so as to facilitate the adsorption of oxygen in the gas flow on the first carbon molecular sieve 8 and the second carbon molecular sieve 9, in the present embodiment, preferably, one side of the left adsorption tower 2 is connected to the first feed pipe 4, and one side of the right adsorption tower 3 is connected to the second feed pipe 5, and the first feed pipe 4 and the second feed pipe 5 are both connected to the lower part of one side of the first carbon molecular sieve 8.

[0029] In order to ensure a sealed connection between the three-way valve 6 and the first feed pipe 4 and the second feed pipe 5, and to facilitate the control of the flow direction of the airflow, in this embodiment, preferably, the three-way valve 6 and the first feed pipe 4 and the second feed pipe 5 are connected via a first connecting flange 17 and a first fixing bolt 18, and a rotating handwheel 7 is provided on the three-way valve 6.

[0030] In order to achieve pressure equalization operation between the left adsorption tower 2 and the right adsorption tower 3 so that the pressures of the two towers are balanced, in this embodiment, preferably, the cover plates 10 on both sides are connected with pressure equalizing pipes 11, and the pressure equalizing pipes 11 are connected between the second carbon molecular sieve 9 and the first carbon molecular sieve 8.

[0031] In order to ensure a sealed connection between the pressure equalizing tube 11 and the control valve 12 and facilitate on-off control, in this embodiment, preferably, the pressure equalizing tube 11 and the control valve 12 on both sides are connected via a second flange 15 and a second fixing bolt 16 .

[0032] In order to discharge the airflow after absorbing oxygen, that is, due to the dynamic effect of air, the diffusion rate of oxygen in the micropores of the carbon molecular sieve is much greater than that of nitrogen, oxygen is preferentially adsorbed by the carbon molecular sieve, and nitrogen is enriched in the gas phase to form finished nitrogen for discharge. In this embodiment, preferably, the cover plates 10 on both sides are respectively connected with discharge pipes 14, and the discharge pipes 14 are respectively connected to one side of the second carbon molecular sieve 9.

[0033] In order to achieve a sealed connection between the cover plate 10 and the left adsorption tower 2 and the right adsorption tower 3 , in this embodiment, preferably, the left adsorption tower 2 and the right adsorption tower 3 are fixedly connected to the cover plate 10 via a third flange 20 and a third fixing bolt 21 .

[0034] Working principle: When in use, the air in the external air compressor, air purification system, and air storage tank is transported to the left adsorption tower 2 or the right adsorption tower 3 through the three-way valve 6. First, the air is transported to the left adsorption tower 2. At this time, the pressure of the left adsorption tower 2 increases, and the oxygen molecules in the compressed air are adsorbed by the first carbon molecular sieve 8 and the second carbon molecular sieve 9, and the unadsorbed nitrogen is discharged through the discharge pipe 14. This process is called adsorption and lasts for tens of seconds. After the adsorption process is completed, the left adsorption tower 2 and the right adsorption tower 3 are connected through the control valve 12, so that the pressure of the left adsorption tower 2 and the right adsorption tower 3 reaches Balance, this process is called pressure equalization, which lasts for about 3-5 seconds; after the pressure equalization is completed, the compressed air passes through the three-way valve 6 and enters the right adsorption tower 3 to repeat the above adsorption process; at the same time, the oxygen adsorbed by the first carbon molecular sieve 8 and the second carbon molecular sieve 9 in the left adsorption tower 2 is decompressed and released into the atmosphere through the exhaust pipe 14, and this process is called desorption, and the saturated first carbon molecular sieve 8 and the second carbon molecular sieve 9 are regenerated; similarly, the left adsorption tower 2 and the right adsorption tower 3 are also desorbing at the same time; after the adsorption of the right adsorption tower 3 is completed, it also enters the pressure equalization process, and then switches to the left adsorption tower 2 for adsorption, and the cycle is alternating to continuously produce nitrogen;

[0035] In addition, a gap is left between the upper end of the first carbon molecular sieve 8 and the cover plate 10, and a gap is left between the bottom of the second carbon molecular sieve 9 and the bottom plate 13, so that an air flow channel can be formed between the left adsorption tower 2 and the right adsorption tower 3, so that the air flow can fully contact the first carbon molecular sieve 8 and the second carbon molecular sieve 9, so that the oxygen in the air flow can be fully absorbed, thereby improving the absorption efficiency.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel pressure swing adsorption nitrogen generator, comprising a base (1), characterized in that: A left adsorption tower (2) and a right adsorption tower (3) are fixedly mounted on the base (1), a bottom plate (13) is placed inside the left adsorption tower (2) and the right adsorption tower (3), a first carbon molecular sieve (8) is provided on the base (1), a cover plate (10) is mounted on the upper part of the left adsorption tower (2) and the right adsorption tower (3), a second carbon molecular sieve (9) is fixedly mounted on the lower part of the cover plate (10), a gap is left between the upper end of the first carbon molecular sieve (8) and the cover plate (10), and a gap is left between the bottom of the second carbon molecular sieve (9) and the bottom plate (13); A three-way valve (6) is connected between the left adsorption tower (2) and the right adsorption tower (3), and a control valve (12) is connected between the cover plates (10) on both sides.

2. A novel pressure swing adsorption nitrogen generator according to claim 1, characterized in that: A crossbeam (22) is welded in the middle of the base (1), support columns (19) are welded on the sides of the base (1) and the crossbeam (22), and the left adsorption tower (2) and the right adsorption tower (3) are welded on the support columns (19).

3. The novel pressure swing adsorption nitrogen generator according to claim 1 is characterized in that: One side of the left adsorption tower (2) is connected to a first feed pipe (4), and one side of the right adsorption tower (3) is connected to a second feed pipe (5), and the first feed pipe (4) and the second feed pipe (5) are both connected to the lower part of one side of the first carbon molecular sieve (8).

4. A novel pressure swing adsorption nitrogen generator according to claim 3, characterized in that: The three-way valve (6) and the first feed pipe (4) and the second feed pipe (5) are connected via a first connecting flange (17) and a first fixing bolt (18), and a rotating hand wheel (7) is provided on the three-way valve (6).

5. The novel pressure swing adsorption nitrogen generator according to claim 1 is characterized in that: The cover plates (10) on both sides are connected to equalizing pipes (11), and the equalizing pipes (11) are connected between the second carbon molecular sieve (9) and the first carbon molecular sieve (8).

6. A novel pressure swing adsorption nitrogen generator according to claim 5, characterized in that: The pressure equalizing pipes (11) on both sides are connected to the control valve (12) via a second flange (15) and a second fixing bolt (16).

7. The novel pressure swing adsorption nitrogen generator according to claim 1 is characterized in that: The cover plates (10) on both sides are respectively connected to discharge pipes (14), and the discharge pipes (14) are respectively connected to one side of the second carbon molecular sieve (9).

8. The novel pressure swing adsorption nitrogen generator according to claim 1 is characterized in that: The left adsorption tower (2) and the right adsorption tower (3) are fixedly connected to the cover plate (10) via a third flange (20) and a third fixing bolt (21).

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