Self-adaptive three-tower oxygen generation system

Abstract

The utility model discloses a self-adaptive three-tower oxygen generation system which comprises three molecular sieve towers arranged in parallel, the circulation valve group comprises an air inlet valve which is connected with each molecular sieve tower and is connected to the air inlet in parallel, an air outlet valve which is connected with each molecular sieve tower and is connected to the oxygen outlet in parallel, and a pressure release valve which is connected with each molecular sieve tower and is connected to the silencer in parallel; the air outlet pipes of all the molecular sieve towers are communicated through a connecting pipe, and the connecting pipe is provided with a plurality of bypass valves used for controlling whether any two molecular sieve towers are communicated or not; the upper pressure equalizing valve group comprises upper pressure equalizing valves which are correspondingly connected with the air outlets of the molecular sieve towers respectively and are connected in parallel; the lower pressure-equalizing valve group comprises lower pressure-equalizing valves which are correspondingly connected with the air inlets of the molecular sieve towers respectively and are connected in parallel, and the upper pressure-equalizing valve group is connected with the lower pressure-equalizing valve group. A pressure equalizing tank and a vacuum pump are omitted, so that the effect of improving the upper limit of oxygen production of the three towers is achieved, the equipment structure is simplified, and the operation is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen production, in particular to an adaptive three-tower oxygen production system. Background Art

[0002] The PSA oxygen production technology uses zeolite molecular sieve as an adsorbent. When any adsorbent adsorbs the same gas, within the pressure range that the adsorbent can withstand, the higher the gas pressure, the greater the adsorption capacity of the adsorbent. Conversely, the lower the pressure, the smaller the adsorption capacity. Therefore, when the air pressure increases, the zeolite molecular sieve will preferentially adsorb a large amount of nitrogen and other useless gases. When the pressure drops to atmospheric pressure, its adsorption capacity for nitrogen and other useless gases is very small, so the zeolite molecular sieve can be desorbed.

[0003] A normal PSA pressure swing adsorption oxygen production system has a structure of two adsorption towers. When the zeolite molecular sieve in one adsorption tower adsorbs to produce oxygen, the other tower desorbs the zeolite molecular sieve. Therefore, the utilization efficiency of the zeolite molecular sieve is less than 50%. In order to improve the production efficiency of the PSA oxygen generator, a structure of three adsorption towers is proposed. However, the traditional three-tower structure requires an additional equalizing tank and a vacuum pump for auxiliary equalizing and desorption processing respectively, with a relatively complex structure, cumbersome operation, and high equipment cost.

[0004] Therefore, on the basis of ensuring the improvement of the utilization rate of the zeolite molecular sieve, the research purpose of the present utility model is to design an adaptive three-tower oxygen production system that can not only simplify the equipment structure, optimize the operation, but also increase the oxygen production limit. Content of the Utility Model

[0005] In view of the above technical problems existing in the prior art, the present utility model provides an adaptive three-tower oxygen production system, which can effectively solve the above technical problems existing in the prior art.

[0006] The technical solution of the present utility model is as follows:

[0007] An adaptive three-tower oxygen production system includes:

[0008] A molecular sieve tower group, including at least three molecular sieve towers arranged in parallel. An air outlet is provided at the top of the molecular sieve tower, and an air inlet is provided at the bottom thereof;

[0009] A circulation valve group, including an intake valve that is respectively connected to the air inlet of each molecular sieve tower through a corresponding intake pipe and is connected in parallel to the air inlet, an outlet valve that is respectively connected to the air outlet of each molecular sieve tower through a corresponding outlet pipe and is connected in parallel to the oxygen outlet, and a pressure relief valve that is respectively connected to the air inlet of each molecular sieve tower and is connected in parallel to the muffler;

[0010] Bypass valve group. The outlet pipes of all the molecular sieve towers are connected by corresponding connecting pipes, and several bypass valves for controlling the connection or disconnection between any two molecular sieve towers are arranged on the connecting pipes.

[0011] Upper equalizing valve group, including upper equalizing valves respectively corresponding to and connected to the outlet ports of each molecular sieve tower and interconnected through a first multi-way pipe fitting. The upper equalizing valves, outlet valves and bypass valves are arranged in parallel at the top of the corresponding molecular sieve towers.

[0012] Lower equalizing valve group, including lower equalizing valves respectively corresponding to and connected to the inlet ports of each molecular sieve tower and interconnected through a second multi-way pipe fitting. The lower equalizing valves, inlet valves and pressure relief valves are arranged in parallel at the bottom of the corresponding molecular sieve towers. The first multi-way pipe fitting and the second multi-way pipe fitting are connected through corresponding connecting pipes.

[0013] The inlet valve, outlet valve, pressure relief valve, upper equalizing valve and lower equalizing valve are all pneumatic valves.

[0014] The molecular sieve tower group includes molecular sieve tower A, molecular sieve tower B and molecular sieve tower C arranged in parallel, and they are all zeolite molecular sieve towers.

[0015] The inlet port of the molecular sieve tower A is connected in parallel with an inlet valve V1, a pressure relief valve V4 and a lower equalizing valve V7. The inlet port of the molecular sieve tower B is connected in parallel with an inlet valve V2, a pressure relief valve V5 and a lower equalizing valve V8. The inlet port of the molecular sieve tower C is connected in parallel with an inlet valve V3, a pressure relief valve V6 and a lower equalizing valve V9.

[0016] The inlet valve V1, inlet valve V2 and inlet valve V3 are connected in parallel to the air inlet. The pressure relief valve V4, pressure relief valve V5 and pressure relief valve V6 are connected in parallel to the muffler. The lower equalizing valve V7, lower equalizing valve V8 and lower equalizing valve V9 are connected in parallel through the first multi-way pipe fitting.

[0017] The connecting pipes are all connected to the outlet pipes of the molecular sieve tower A, molecular sieve tower B and molecular sieve tower C, and a bypass valve VⅠ arranged between the molecular sieve tower A and the molecular sieve tower B and a bypass valve VⅡ arranged between the molecular sieve tower A and the molecular sieve tower B are serially installed on the connecting pipes.

[0018] The outlet port of the molecular sieve tower A is connected in parallel with an outlet valve V13, an upper equalizing valve V10 and the bypass valve VⅠ. The outlet port of the molecular sieve tower B is connected in parallel with an outlet valve V14, an upper equalizing valve V11, the bypass valve VⅠ and the bypass valve VⅡ. The outlet port of the molecular sieve tower C is connected in parallel with an outlet valve V15, an upper equalizing valve V12 and the bypass valve VⅡ.

[0019] The outlet valves V13, V14, and V15 are connected in parallel to the oxygen outlet. The upper equalizing valves V10, V11, and V12 are connected in parallel through the first multi-way pipe fitting, and the first multi-way pipe fitting is connected to the second multi-way pipe fitting through a connecting pipe.

[0020] The outlet pipes of the molecular sieve A tower, molecular sieve B tower, and molecular sieve C tower are all connected to the outlet main pipe, and an exhaust main valve is installed on the outlet main pipe.

[0021] Corresponding pressure gauges are installed on the molecular sieve A tower, molecular sieve B tower, and molecular sieve C tower.

[0022] Advantages of the present utility model:

[0023] 1) The present utility model uses the pressure swing adsorption method to produce oxygen, uses zeolite molecular sieve as an adsorbent, has three towers connected in parallel, and alternately performs pressure swing adsorption and atmospheric pressure regeneration for oxygen production, and improves the utilization rate of zeolite molecular sieve, which can reach more than 60%. With less zeolite molecular sieve, it can produce higher purity and more gas volume of oxygen. More importantly, through the improvement of the structure, by connecting and setting bypass valve groups between the molecular sieve towers, and upper and lower equalizing valve groups connected in parallel to omit the setting of equalizing tanks and vacuum pumps, while achieving the effect of improving the oxygen production upper limit of the three towers, it simplifies the equipment structure and optimizes the operation.

[0024] 2) The oxygen production system of the present utility model adsorbs with the molecular sieve A tower and molecular sieve B tower, and desorbs with the molecular sieve C tower; adsorbs with the molecular sieve B tower and molecular sieve C tower, and desorbs with the molecular sieve A tower; adsorbs with the molecular sieve A tower and molecular sieve C tower, and desorbs with the molecular sieve B tower; thus, it is a whole switching cycle to produce qualified oxygen. Specifically:

[0025] The inlet valve and outlet valve of the molecular sieve A tower are opened for adsorption oxygen production, and the upper equalizing valves connecting the molecular sieve B tower and molecular sieve C tower are all opened to achieve upper equalizing of the molecular sieve B tower and molecular sieve C tower; after completing the upper equalizing, keep the inlet valve and outlet valve of the molecular sieve A tower open, and the upper equalizing valves connecting the molecular sieve B tower and molecular sieve C tower, and the lower equalizing valve connecting the molecular sieve B tower are all opened to achieve upper and lower equalizing of the molecular sieve B tower and molecular sieve C tower at the same time; after completing the upper and lower equalizing, the inlet valves and outlet valves of the molecular sieve A tower and molecular sieve B tower are all opened to simultaneously produce oxygen by adsorption with the molecular sieve A tower and molecular sieve B tower; a part of the oxygen produced by the molecular sieve A tower and molecular sieve B tower is used to purge and desorb the molecular sieve C tower through the bypass valve VⅠ and bypass valve VⅡ, and is discharged through the pressure relief valve connecting the molecular sieve C tower via a muffler to achieve desorption of the molecular sieve C tower.

[0026] The intake valve and outlet valve of molecular sieve tower B are opened for oxygen production by adsorption. The upper equalizing valves connecting molecular sieve tower A and molecular sieve tower C are all opened to achieve upper equalization between molecular sieve tower A and molecular sieve tower C. After the upper equalization is completed, the intake valve and outlet valve of molecular sieve tower B are kept open, and the upper equalizing valves connecting molecular sieve tower A and molecular sieve tower C and the lower equalizing valve connecting molecular sieve tower C are all opened to achieve simultaneous upper and lower equalization between molecular sieve tower A and molecular sieve tower C. After the upper and lower equalizations are completed, the intake valves and outlet valves of molecular sieve tower B and molecular sieve tower C are all opened to carry out simultaneous oxygen production by adsorption for molecular sieve tower B and molecular sieve tower C. Part of the oxygen produced by molecular sieve tower B and molecular sieve tower C is used to purge and desorb molecular sieve tower A by bypass valve VⅠ and bypass valve VⅡ, and is discharged through the silencer via the pressure relief valve connecting molecular sieve tower A, realizing the desorption of molecular sieve tower A.

[0027] The intake valve and outlet valve of molecular sieve tower C are opened for oxygen production by adsorption. The upper equalizing valves connecting molecular sieve tower A and molecular sieve tower B are all opened to achieve upper equalization between molecular sieve tower A and molecular sieve tower B. After the upper equalization is completed, the intake valve and outlet valve of molecular sieve tower C are kept open, and the upper equalizing valves connecting molecular sieve tower A and molecular sieve tower B and the lower equalizing valve connecting molecular sieve tower A are all opened to achieve simultaneous upper and lower equalization between molecular sieve tower A and molecular sieve tower B. After the upper and lower equalizations are completed, the intake valves and outlet valves of molecular sieve tower C and molecular sieve tower A are all opened to carry out simultaneous oxygen production by adsorption for molecular sieve tower C and molecular sieve tower B. Part of the oxygen produced by molecular sieve tower C and molecular sieve tower A is used to purge and desorb molecular sieve tower B by bypass valve VⅠ and bypass valve VⅡ, and is discharged through the silencer via the pressure relief valve connecting molecular sieve tower B, realizing the desorption of molecular sieve tower B. Brief Description of the Drawings

[0028] Figure 1 It is a structural schematic diagram of the present utility model.

[0029] Figure 2 It is a schematic diagram of gas flow when molecular sieve tower A adsorbs and molecular sieve towers B and C are under upper equalization.

[0030] Figure 3 It is a schematic diagram of gas flow when molecular sieve tower A adsorbs and molecular sieve towers B and C are under upper and lower equalization.

[0031] Figure 4 It is a schematic diagram of gas flow when molecular sieve towers A and B adsorb and molecular sieve tower C desorbs.

[0032] Figure 5 It is a schematic diagram of gas flow when molecular sieve tower B adsorbs and molecular sieve towers A and C are under upper equalization.

[0033] Figure 6 It is a schematic diagram of gas flow when molecular sieve B adsorbs and molecular sieve towers A and C are under upper and lower equalization.

[0034] Figure 7 Schematic diagram of gas flow when molecular sieve tower B and molecular sieve tower C are in adsorption and molecular sieve tower A is in desorption.

[0035] Figure 8 Schematic diagram of gas flow when molecular sieve tower C is in adsorption and molecular sieve towers A and B are in equalization.

[0036] Figure 9 Schematic diagram of gas flow when molecular sieve C is in adsorption and molecular sieve towers A and B are in upper and lower equalization.

[0037] Figure 10 Schematic diagram of gas flow when molecular sieve towers C and A are in adsorption and molecular sieve tower B is in desorption.

[0038] In the attached drawings: inlet pipe 1, inlet valve 2, outlet pipe 3, outlet valve 4, silencer 5, pressure relief valve 6, connecting pipe 7, bypass valve 8, first multi-way pipe fitting 9, upper equalization valve 10, second multi-way pipe fitting 11, lower equalization valve 12, connecting pipe 13, outlet main pipe 14, exhaust main valve 15, pressure gauge 16. Detailed implementation manners

[0039] For the convenience of those skilled in the art to understand, the embodiments will be further described in detail in conjunction with the attached drawings for the structure of the present utility model:

[0040] Reference Figure 1 , an adaptive three-tower oxygen generation system, comprising:

[0041] A molecular sieve tower group, including at least three molecular sieve towers arranged in parallel, with an air outlet provided at the top of the molecular sieve tower and an air inlet provided at the bottom thereof;

[0042] A flow valve group, including an inlet valve 2 that is respectively connected to the air inlet of each molecular sieve tower through a corresponding inlet pipe 1 and is connected in parallel to the air inlet, an outlet valve 4 that is respectively connected to the air outlet of each molecular sieve tower through a corresponding outlet pipe 3 and is connected in parallel to the oxygen outlet, and a pressure relief valve 6 that is respectively connected to the air inlet of each molecular sieve tower and is connected in parallel to the silencer 5;

[0043] A bypass valve group, the outlet pipes 3 of all the molecular sieve towers are connected by corresponding connecting pipes 7, and a plurality of bypass valves 8 for controlling whether any two molecular sieve towers are connected or not are provided on the connecting pipes 7;

[0044] An upper equalization valve group, including upper equalization valves 10 that are respectively connected to the air outlets of each molecular sieve tower and are connected to each other through a first multi-way pipe fitting 9, and the upper equalization valves 10, outlet valves 4 and bypass valves 8 are arranged in parallel on the top of the corresponding molecular sieve tower;

[0045] The lower equalizing valve group includes lower equalizing valves 12 respectively corresponding to and connected to the air inlets of each molecular sieve tower and interconnected through a second multi-way pipe fitting 11. The lower equalizing valves 12, inlet valves 2 and pressure relief valves 6 are arranged in parallel at the bottom of the corresponding molecular sieve tower. The first multi-way pipe fitting 9 and the second multi-way pipe fitting 11 are connected and communicated through a corresponding connecting pipe 13.

[0046] The inlet valves 2, outlet valves 4, pressure relief valves 6, upper equalizing valves 10 and lower equalizing valves 12 are all pneumatic valves.

[0047] The molecular sieve tower group includes a molecular sieve A tower, a molecular sieve B tower and a molecular sieve C tower arranged in parallel, and all are zeolite molecular sieve towers.

[0048] The air inlet of the molecular sieve A tower is connected in parallel with an inlet valve V1, a pressure relief valve V4 and a lower equalizing valve V7. The air inlet of the molecular sieve B tower is connected in parallel with an inlet valve V2, a pressure relief valve V5 and a lower equalizing valve V8. The air inlet of the molecular sieve C tower is connected in parallel with an inlet valve V3, a pressure relief valve V6 and a lower equalizing valve V9.

[0049] The inlet valve V1, inlet valve V2 and inlet valve V3 are connected in parallel to the air inlet. The pressure relief valve V4, pressure relief valve V5 and pressure relief valve V6 are connected in parallel to the muffler 5. The lower equalizing valve V7, lower equalizing valve V8 and lower equalizing valve V9 are connected in parallel through the first multi-way pipe fitting 9.

[0050] The connecting pipe 7 communicates with the outlet pipes of the molecular sieve A tower, the molecular sieve B tower and the molecular sieve C tower, and a bypass valve VⅠ arranged between the molecular sieve A tower and the molecular sieve B tower and a bypass valve VⅡ arranged between the molecular sieve A tower and the molecular sieve B tower are installed in series on the connecting pipe 7.

[0051] The outlet of the molecular sieve A tower is connected in parallel with an outlet valve V13, an upper equalizing valve V10 and the bypass valve VⅠ. The outlet of the molecular sieve B tower is connected in parallel with an outlet valve V14, an upper equalizing valve V11, the bypass valve VⅠ and the bypass valve VⅡ. The outlet of the molecular sieve C tower is connected in parallel with an outlet valve V15, an upper equalizing valve V12 and the bypass valve VⅡ.

[0052] The outlet valve V13, outlet valve V14 and outlet valve V15 are connected in parallel to the oxygen outlet. The upper equalizing valve V10, upper equalizing valve V11 and upper equalizing valve V12 are connected in parallel through the first multi-way pipe fitting 9, and the first multi-way pipe fitting 9 and the second multi-way pipe fitting 11 are connected through a connecting pipe 13.

[0053] The outlet pipes 3 of the molecular sieve A tower, the molecular sieve B tower and the molecular sieve C tower are all connected to an outlet main pipe 14, and an exhaust main valve 15 is installed on the outlet main pipe 14.

[0054] A pressure gauge 16 is installed on each of the molecular sieve A tower, molecular sieve B tower, and molecular sieve C tower.

[0055] The present utility model uses a pressure swing adsorption method to produce oxygen. Zeolite molecular sieve is used as an adsorbent, and three towers are connected in parallel to alternately perform pressure swing adsorption and atmospheric pressure regeneration for oxygen production, and the utilization rate of the zeolite molecular sieve is increased to more than 60%. Higher purity and more gas volume of oxygen are produced with less zeolite molecular sieve. More importantly, through structural improvement, by connecting and setting bypass valve groups between molecular sieve towers, and upper equalizing valve groups and lower equalizing valve groups connected in parallel, the setting of equalizing tanks and vacuum pumps is omitted, achieving the effect of increasing the oxygen production upper limit of the three towers while simplifying the equipment structure and optimizing the operation.

[0056] The specific process of a whole switching cycle of the present utility model is as follows:

[0057] 1-1) Refer to Figure 2 , the molecular sieve A tower adsorbs, and the molecular sieve B tower and molecular sieve C tower perform upper equalizing: the intake valve V1, upper equalizing valve V11, upper equalizing valve V12, and outlet valve V13 are opened. Compressed air passes from the intake valve V1 to the molecular sieve A tower for adsorption to obtain oxygen, and then exits through the outlet valve V13; the upper equalizing valves V11 and V12 are opened, and the molecular sieve B tower and molecular sieve C tower perform upper equalizing;

[0058] 1-2) Refer to Figure 3 , the molecular sieve A tower adsorbs, and the molecular sieve B tower and molecular sieve C tower perform upper and lower equalizing: the intake valve V1, lower equalizing valve V8, upper equalizing valve V11, upper equalizing valve V12, and outlet valve V13 are opened. Compressed air passes from V1 to the molecular sieve A tower for adsorption to obtain oxygen, and then exits through the outlet valve V13; the lower equalizing valve V8, upper equalizing valve V11, and intake valve V2 are opened, and the molecular sieve B tower and molecular sieve C tower perform upper and lower equalizing simultaneously;

[0059] 1-3) Refer to Figure 4 , the molecular sieve A tower and molecular sieve B tower adsorb, and the molecular sieve C tower desorbs: the intake valve V1, intake valve V2, pressure relief valve V6, outlet valve V13, and outlet valve V14 are opened. Compressed air passes from the intake valve V1 and intake valve V2 to the molecular sieve A tower and molecular sieve B tower for adsorption to obtain oxygen, and then exits through the outlet valve V13 and outlet valve V14; the molecular sieve C tower desorbs, and a part of the oxygen in the molecular sieve A tower and molecular sieve B tower is used to purge and desorb the molecular sieve C tower through the bypass valve VⅠ and bypass valve VⅡ, and is discharged through the pressure relief valve V6 via the muffler 5;

[0060] 2-1) Refer to Figure 5, Molecular sieve B tower adsorbs, and molecular sieve A tower and molecular sieve C tower equalize pressure: Inlet valve V2, upper equalizing valve V10, upper equalizing valve V12, and outlet valve V14 are opened. Compressed air passes through inlet valve V2 to molecular sieve B tower for adsorption to obtain oxygen, and then exits through outlet valve V14; Upper equalizing valves V10 and V12 are opened, and molecular sieve A and molecular sieve C towers equalize pressure upwards;

[0061] 2-2) Reference Figure 6 , Molecular sieve B adsorbs, and molecular sieve A tower and molecular sieve C tower equalize pressure up and down: Inlet valve V2, lower equalizing valve V9, upper equalizing valve V10, upper equalizing valve V12, and outlet valve V14 are opened. Compressed air passes through inlet valve V2 to molecular sieve B tower for adsorption to obtain oxygen, and then exits through outlet valve V14; Lower equalizing valve V9, upper equalizing valves V10 and V12 are opened, and molecular sieve B tower and molecular sieve C tower equalize pressure up and down;

[0062] 2-3) Reference Figure 7 , Molecular sieve B tower and molecular sieve C tower adsorb, and molecular sieve A tower desorbs: Inlet valves V2 and V3, pressure relief valve V4, outlet valves V14 and V15 are opened. Compressed air passes through inlet valves V2 and V3 to molecular sieve B tower and molecular sieve C tower for adsorption to obtain oxygen, and then exits through outlet valves V14 and V15; Molecular sieve A tower desorbs, and part of the oxygen in molecular sieve B tower and molecular sieve C tower purges and desorbs molecular sieve A tower through bypass valve VⅠ and bypass valve VⅡ, and is discharged through pressure relief valve V4 via silencer 5;

[0063] 3-1) Reference Figure 8 , Molecular sieve C tower adsorbs, and molecular sieve A tower and molecular sieve B tower equalize pressure upwards: Inlet valve V3, upper equalizing valve V10, upper equalizing valve V11, and outlet valve V15 are pneumatically opened. Compressed air passes through inlet valve V3 to molecular sieve C tower for adsorption to obtain oxygen, and then exits through outlet valve V15; Upper equalizing valves V10 and V11 are opened, and molecular sieve A tower and molecular sieve B tower equalize pressure upwards;

[0064] 3-2) Reference Figure 9 , Molecular sieve C adsorbs, and molecular sieve A tower and molecular sieve B tower equalize pressure up and down: Inlet valve V3, lower equalizing valve V7, upper equalizing valve V10, upper equalizing valve V11, and outlet valve V15 are opened. Compressed air passes through inlet valve V3 to molecular sieve C tower for adsorption to obtain oxygen, and then exits through outlet valve V15; Lower equalizing valve V7, upper equalizing valves V10 and V11 are opened, and molecular sieve A tower and molecular sieve B tower equalize pressure up and down;

[0065] 3-3) Reference Figure 10, the molecular sieve C tower and the molecular sieve A tower adsorb, and the molecular sieve B tower desorbs: the intake valves V1, V3, the pressure relief valve V5, the outlet valves V13, V15 are opened, and the compressed air passes through the intake valves V1, V3 to the molecular sieve A tower and the molecular sieve C tower for adsorption to obtain oxygen, and then exits through the outlet valves V13 and V15; the molecular sieve B tower desorbs, and the oxygen in the molecular sieve A tower and the molecular sieve C tower is purged and desorbed from the molecular sieve B tower by the bypass valves VⅠ and VⅡ, and is discharged through the pressure relief valve V5 and the silencer 5.

[0066] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An adaptive three-tower oxygen production system, characterized in that: include: A molecular sieve tower group, comprising at least three molecular sieve towers arranged in parallel, wherein the top of each molecular sieve tower is provided with an air outlet, and the bottom of each molecular sieve tower is provided with an air inlet; The circulation valve group comprises an air inlet valve (2) connected to the air inlet of each molecular sieve tower through a corresponding air inlet pipe (1) and connected to the air inlet in parallel with each other, an air outlet valve (4) connected to the air outlet of each molecular sieve tower through a corresponding air outlet pipe (3) and connected to the oxygen outlet in parallel with each other, and a pressure relief valve (6) connected to the air inlet of each molecular sieve tower and connected to the silencer (5) in parallel with each other; A bypass valve group, wherein the gas outlet pipes (3) of all the molecular sieve towers are connected by corresponding connecting pipes (7), and the connecting pipes (7) are provided with a plurality of bypass valves (8) for controlling whether any two molecular sieve towers are connected; An upper pressure equalizing valve group comprises upper pressure equalizing valves (10) respectively connected to the gas outlets of the molecular sieve towers and connected to each other through a first multi-way pipe member (9), wherein the upper pressure equalizing valve (10), the gas outlet valve (4) and the bypass valve (8) are arranged in parallel at the top of the corresponding molecular sieve tower; The lower pressure equalizing valve group comprises lower pressure equalizing valves (12) respectively connected to the air inlets of the molecular sieve towers and connected to each other through a second multi-way pipe member (11); the lower pressure equalizing valve (12), the air inlet valve (2) and the pressure relief valve (6) are arranged in parallel at the bottom of the corresponding molecular sieve tower; the first multi-way pipe member (9) and the second multi-way pipe member (11) are connected through corresponding connecting pipes (13).

2. The adaptive three-tower oxygen production system according to claim 1, characterized in that: The air inlet valve (2), the air outlet valve (4), the pressure relief valve (6), the upper pressure equalizing valve (10) and the lower pressure equalizing valve (12) are all pneumatic valves.

3. The adaptive three-tower oxygen production system according to claim 1, characterized in that: The molecular sieve tower group comprises a molecular sieve A tower, a molecular sieve B tower and a molecular sieve C tower which are arranged in parallel, and all of them are zeolite molecular sieve towers.

4. The adaptive three-tower oxygen production system according to claim 3, characterized in that: The air inlet of the molecular sieve A tower is connected in parallel with an air inlet valve V1, a pressure relief valve V4 and a lower pressure equalizing valve V7, the air inlet of the molecular sieve B tower is connected in parallel with an air inlet valve V2, a pressure relief valve V5 and a lower pressure equalizing valve V8, and the air inlet of the molecular sieve C tower is connected in parallel with an air inlet valve V3, a pressure relief valve V6 and a lower pressure equalizing valve V9.

5. The adaptive three-tower oxygen production system according to claim 4, characterized in that: The air intake valve V1, the air intake valve V2 and the air intake valve V3 are connected in parallel to the air inlet, the pressure relief valve V4, the pressure relief valve V5 and the pressure relief valve V6 are connected in parallel to the muffler (5), and the lower pressure equalizing valve V7, the lower pressure equalizing valve V8 and the lower pressure equalizing valve V9 are connected in parallel via the first multi-way pipe member (9).

6. The adaptive three-tower oxygen production system according to claim 5, characterized in that: The connecting pipes (7) are connected to the gas outlet pipes of the molecular sieve tower A, the molecular sieve tower B and the molecular sieve tower C, and a bypass valve VI arranged between the molecular sieve tower A and the molecular sieve tower B, and a bypass valve VI arranged between the molecular sieve tower A and the molecular sieve tower B are installed in series on the connecting pipe (7).

7. The adaptive three-tower oxygen production system according to claim 6, characterized in that: The gas outlet of the molecular sieve A tower is connected in parallel with the gas outlet valve V13, the upper pressure equalizing valve V10 and the bypass valve VI, the gas outlet of the molecular sieve B tower is connected in parallel with the gas outlet valve V14, the upper pressure equalizing valve V11, the bypass valve VI and the bypass valve VI, and the gas outlet of the molecular sieve C tower is connected in parallel with the gas outlet valve V15, the upper pressure equalizing valve V12 and the bypass valve VI.

8. The adaptive three-tower oxygen production system according to claim 7, characterized in that: The outlet valves V13, V14 and V15 are connected in parallel to the oxygen outlet, the upper pressure equalizing valves V10, V11 and V12 are connected in parallel via the first multi-way pipe member (9), and the first multi-way pipe member (9) is connected to the second multi-way pipe member (11) via a connecting pipe (13).

9. The adaptive three-tower oxygen production system according to claim 1, characterized in that: The gas outlet pipes (3) of the molecular sieve A tower, the molecular sieve B tower and the molecular sieve C tower are all connected to a gas outlet main pipe (14), and a main exhaust valve (15) is installed on the gas outlet main pipe (14).

10. The adaptive three-tower oxygen production system according to claim 1, characterized in that: The molecular sieve A tower, the molecular sieve B tower and the molecular sieve C tower are all equipped with corresponding pressure gauges (16).

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