Efficient and energy-saving PSA oxygen generator

Abstract

The utility model relates to the technical field of medical oxygen generators, and discloses a high-efficiency energy-saving PSA oxygen generator which comprises an adsorption tank, a gas inlet pipeline, a nitrogen discharge pipeline, an I-shaped balance pipeline, a first purging pipeline, a second purging pipeline, an oxygen outlet pipeline, a purity measurement pipeline, a qualified gas pipeline, an unqualified gas pipeline and an emptying pipeline, a throttling element is arranged on each of an inlet pipeline and an outlet pipeline of the adsorption tank and used for controlling the flow of gas when the adsorption tank is balanced, impact of high-speed gas on a molecular sieve is avoided, oxygen-enriched air can stay at the top of the adsorption tank in various balance modes, and desorbed low-concentration oxygen is adsorbed again to obtain the oxygen-enriched air. And the oxygen recovery rate is improved, so that the air consumption is reduced, the required power of an air compressor is reduced, and the energy consumption required by oxygen production is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical oxygen generator technology, specifically a high-efficiency and energy-saving PSA oxygen generator. Background Technology

[0002] Currently, PSA oxygen concentrators generally employ a dual-tower circulating oxygen production method. During the circulation process, one adsorption tank receives air, adsorbs nitrogen, and produces oxygen, while the other adsorption tank precipitates the nitrogen and discharges it through a silencer until the pressure inside the tank reaches 0 MPa. The subsequent step involves the high-pressure adsorption tank balancing the low-pressure adsorption tank. This aims to increase the pressure inside the low-pressure adsorption tank, improving the adsorption effect, and also to fully utilize the oxygen-enriched air at the top of the adsorption tank, increasing the oxygen recovery rate. Existing oxygen concentrators typically use a top-to-top balancing method, balancing the top of the adsorption tanks. Towards the end of the balancing process, some of the precipitated nitrogen also enters the top of the low-pressure adsorption tank, affecting the purity of the produced gas. This results in a lower oxygen recovery rate, increased air consumption, and consequently, a higher required air compressor power, leading to increased energy consumption for oxygen production. Utility Model Content

[0003] The purpose of this invention is to provide a high-efficiency and energy-saving PSA oxygen generator to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A high-efficiency and energy-saving PSA oxygen generator includes an adsorption tank A and an adsorption tank B. The top of the adsorption tank A is connected to the top of the adsorption tank B via an I-shaped balance pipe, a first purge pipe, an oxygen outlet pipe, and a second purge pipe. The upper part of the I-shaped balance pipe is equipped with control valves D and I, which connect the tops of the adsorption tanks A and B. The lower part of the pipe is equipped with control valves C and J, which connect the bottoms of the adsorption tanks A and B. The first purge pipe is a T-shaped pipe, and control valves E and F are installed on both sides of the pipe connecting to the top of the adsorption tank. The first purge pipe (13) is connected to the unqualified gas pipe and the vent pipe. One-way valves A and B are installed on both sides of the oxygen outlet pipe. The bottoms of the adsorption tanks A and B are connected by a nitrogen discharge pipe. The pipeline is connected to a silencer and has control valves B and K on both sides. The bottom of adsorption tanks A and B are connected to the inlet pipeline and have control valves A and L on both sides. A purity measuring pipeline is branched off from the middle of the oxygen outlet pipeline for connecting to an oxygen purity meter. A ball valve is installed on the purity measuring pipeline. The end of the oxygen outlet pipeline is connected to a qualified gas pipeline and a non-qualified gas pipeline. The qualified gas pipeline is equipped with a control valve G and a throttling device D. The qualified gas pipeline is connected to an oxygen tank. The non-qualified gas pipeline is equipped with a throttling device E and has a first purging pipeline and an emptying pipeline connected to its end. The emptying pipeline is equipped with a control valve H and a silencer B. The throttling devices D and E are reduced-diameter throttling valves, and the inner diameter of throttling device D is larger than that of throttling device E.

[0006] Furthermore, a throttling element C is provided on the second flushing pipeline, wherein the throttling element C is a reduced-diameter throttling valve.

[0007] Furthermore, a throttling element H is connected in the middle of the intake pipe, and the throttling element H is a reduced-diameter throttling valve.

[0008] Furthermore, throttling element B and throttling element F are respectively provided at the top of adsorption tank A and adsorption tank B, and the throttling element B and throttling element F are reduced diameter throttling valves. Throttling element A and throttling element G are respectively provided at the bottom of adsorption tank A and adsorption tank B, and the throttling element A and throttling element G are reduced diameter throttling valves.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] This invention utilizes multiple balancing methods—top-top, bottom-bottom, top-bottom, and various combinations thereof—to ensure that oxygen-enriched air remains at the top of the adsorption tank. The low-concentration oxygen released during adsorption is then re-adsorbed to obtain oxygen-enriched air, thus improving oxygen recovery rate and reducing air consumption. This results in reduced air compressor power and lower energy consumption for oxygen production. Throttling devices are installed on the inlet and outlet pipes of the adsorption tank to control the gas flow rate during balancing, preventing high-speed gas from impacting the molecular sieve. Throttling devices are also installed on the inlet pipe to control the flow rate of compressed air entering the adsorption tank, reducing the impact of airflow on the molecular sieve. Throttling devices are also installed on the purging pipe to control the purging gas flow rate, reducing the consumption of oxygen-enriched air during purging. Finally, throttling devices are installed on the outlet pipe to control the flow rate of oxygen-enriched air entering the oxygen tank, preventing excessively rapid gas production from the adsorption tank, which could lead to poor adsorption and low gas concentration. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a high-efficiency and energy-saving PSA oxygen generator.

[0012] In the diagram: 1. Control valve A; 2. Inlet pipe; 3. Control valve B; 4. Nitrogen discharge pipe; 5. Silencer A; 6. Control valve C; 7. Throttling device A; 8. Adsorption tank A; 9. Throttling device B; 10. I-shaped balancing pipe; 11. Control valve D; 12. Control valve E; 13. First purge pipe; 14. Control valve F; 15. Throttling device C; 16. Check valve A; 17. Oxygen outlet pipe; 18. Check valve B; 19. Purity measuring device Piping; 20. Ball valve; 21. Qualified gas pipeline; 22. Control valve G; 23. Throttling device D; 24. Unqualified gas pipeline; 25. Throttling device E; 26. Second flushing pipeline; 27. Drain pipeline; 28. Control valve H; 29. ​​Silencer B; 30. Control valve I; 31. Throttling device F; 32. Adsorption tank B; 33. Throttling device G; 34. Control valve J; 35. Control valve K; 36. Control valve L; 37. Throttling device H. Detailed Implementation

[0013] Please see Figure 1In this embodiment of the present invention, a high-efficiency and energy-saving PSA oxygen generator includes an adsorption tank A8 and an adsorption tank B32. The top of the adsorption tank A8 is connected to the top of the adsorption tank B32 via an I-shaped balance pipe 10, a first purge pipe 13, an oxygen outlet pipe 17, and a second purge pipe 26. The upper part of the I-shaped balance pipe 10 is equipped with control valves D11 and I30, connecting the top of the adsorption tank A8 and the top of the adsorption tank B32. The lower part of the pipe is equipped with control valves C6 and J34, connecting the bottom of the adsorption tank A8 and the bottom of the adsorption tank B32. The first purging pipeline 13 is a T-shaped pipeline. Control valves E12 and F14 are installed on both sides of the pipeline connecting to the top of the adsorption tank. Another pipeline of the T-shaped pipeline is connected to the unqualified gas pipeline 24 and the venting pipeline 27. One-way valves A16 and B18 are installed on both sides of the oxygen outlet pipeline 17. The bottom of the adsorption tanks A8 and B32 is connected to the silencer 5 through the nitrogen discharge pipeline 4, and control valves B3 and K35 are respectively installed on both sides. The bottom of the adsorption tanks A8 and B32 is connected to the air inlet pipeline 2, and control valves A1 and L36 are respectively installed on both sides.

[0014] A purity testing pipeline 19 branches off from the middle of the oxygen outlet pipeline 17, used to connect to a purity meter to measure the purity of the produced gas. A ball valve 20 is installed on the purity testing pipeline 19. The oxygen outlet pipeline 17 splits into two pipelines at its end: a qualified gas pipeline 21 and a substandard gas pipeline 24. The qualified gas pipeline 21 is equipped with a control valve G22 and a throttling device D23, and is connected to the oxygen tank. The substandard gas pipeline 24 is equipped with a throttling device E25, and splits into two pipelines at its end: a first purging pipeline 13 and an venting pipeline 27. The venting pipeline 27 is equipped with a control valve H28 and a silencer B29. The throttling devices D23 and E25 are reduced-diameter throttling valves, and the inner diameter of the throttling device D23 is larger than the inner diameter of the orifice of the throttling device E25.

[0015] Furthermore, a throttling element C15 is provided on the second flushing pipeline 26, and the throttling element C15 is a reduced-diameter throttling valve.

[0016] Furthermore, a throttling element H37 is connected in the middle of the intake pipe 2. The throttling element H37 is a reduced-diameter throttling valve.

[0017] Furthermore, throttling elements B9 and F31 are respectively installed at the top of the adsorption tank A8 and adsorption tank B32, respectively. Throttling elements B9 and F31 are reduced-diameter throttling valves. Throttling elements A7 and G33 are respectively installed at the bottom of the adsorption tank A8 and adsorption tank B32, respectively. Throttling elements A7 and G33 are reduced-diameter throttling valves.

[0018] The specific oxygen production process of a high-efficiency and energy-saving PSA oxygen concentrator is as follows:

[0019] 1. After drying and purification, compressed air enters adsorption tank A8 via throttling device H37, inlet pipe 2, and control valve A1. The oxygen-enriched air produced by adsorption tank A8 passes through throttling device B9, one-way valve A16, and oxygen outlet pipe 17. Part of the oxygen-enriched air then passes through ball valve 20 and purity measuring pipe 19 to enter the oxygen purity meter. If the purity is above 90% after testing by the oxygen purity meter, control valve G22 opens, and the oxygen-enriched air produced by adsorption tank A8 continues to enter the oxygen tank via qualified air pipe 21, control valve G22, and throttling device D23. If the purity is below a certain set value, control valve H28 opens, and the oxygen-enriched air produced by adsorption tank A8... The oxygen-enriched air continues to be vented through the unqualified gas pipeline 24, throttling device E25, venting pipeline 27, control valve H28, and silencer B29. If the purity is higher than a certain set value but lower than 90%, control valves F14 and K35 are opened. The oxygen-enriched air produced by adsorption tank A8 continues to be vented through the unqualified gas pipeline 24, throttling device E25, first purging pipeline 13, control valve F14, throttling device F31, adsorption tank B32, throttling device G33, control valve K35, nitrogen venting pipeline 4, and silencer 5. This process achieves both the molecular sieve purging of adsorption tank B32 and the venting of unqualified oxygen.

[0020] 2. The oxygen produced by adsorption tank A8 enters adsorption tank B32 via throttling device C15, second purge pipeline 26, and throttling device F31. The exhaust gas from adsorption tank B32 is discharged through throttling device G33, control valve K35, nitrogen discharge pipeline 4, and silencer 5.

[0021] 3. A portion of the oxygen in adsorption tank A8 enters the top of adsorption tank B32 via throttling device B9, control valve D11, I-shaped balancing pipeline 10, control valve I30, and throttling device F31, achieving a top balancing process between adsorption tank A8 and adsorption tank B32. Simultaneously, another portion of the oxygen in adsorption tank A8 enters the bottom of adsorption tank B32 via throttling device B9, control valve D11, I-shaped balancing pipeline 10, control valve J34, and throttling device G33, achieving a bottom balancing process between adsorption tank A8 and adsorption tank B32. This balancing process can also be performed in various other ways, such as: top-to-top first, then top-to-bottom balancing, top-to-top and bottom-to-bottom balancing simultaneously, etc. The on-site commissioning personnel will modify the program settings to adjust these according to the actual on-site conditions.

[0022] 4. The nitrogen gas desorbed in the adsorption tank A8 is discharged through the throttling device A7, control valve B3, nitrogen discharge pipeline 4, and silencer 5.

[0023] 5. Switching to adsorption tank B32: Compressed air enters adsorption tank B32 via throttling device H37, inlet pipe 2, control valve L36, and throttling device G33. The oxygen-enriched air produced by adsorption tank B32 passes through throttling device F31, one-way valve B18, and oxygen outlet pipe 17. Part of the oxygen-enriched air then passes through ball valve 20 and purity measuring pipe 19 to enter the oxygen purity meter. After testing by the oxygen purity meter, if the purity is qualified (above 90%), control valve G22 opens, and the oxygen-enriched air produced by adsorption tank B32 continues to enter the oxygen tank via qualified air pipe 21, control valve G22, and throttling device D23. If the purity is below a certain set value, control valve H28 opens. The oxygen-enriched air produced by adsorption tank B32 continues to be discharged through unqualified gas pipeline 24, throttling device E25, venting pipeline 27, control valve H28, and silencer B29. If the purity is higher than a certain set value but lower than 90%, control valves E12 and B3 are opened, and the oxygen-enriched air produced by adsorption tank B32 continues to be discharged through unqualified gas pipeline 24, throttling device E25, first purging pipeline 13, control valve E12, throttling device B9, adsorption tank A8, throttling device A7, control valve B3, nitrogen discharge pipeline 4, and silencer 5. This process achieves both the molecular sieve purging of adsorption tank A8 and the discharge of unqualified oxygen.

[0024] 6. Part of the oxygen produced by adsorption tank B32 enters adsorption tank A8 via throttling device C15 and the second purge pipeline 26 and throttling device B9. The exhaust gas desorbed in adsorption tank A8 is discharged through throttling device A7, control valve B3, nitrogen discharge pipeline 4, and silencer 5.

[0025] 7. A portion of the oxygen in adsorption tank B32 enters the top of adsorption tank A8 via throttling device F31, control valve I30, I-shaped balancing pipeline 10, control valve D11, and throttling device B9, achieving a top balancing process between adsorption tank B32 and adsorption tank A8. Simultaneously, another portion of the oxygen in adsorption tank B32 enters the bottom of adsorption tank A8 via throttling device F31, control valve I30, I-shaped balancing pipeline 10, control valve C6, and throttling device A7, achieving a bottom balancing process between adsorption tank B32 and adsorption tank A8. This balancing process can also be performed in various other ways, such as: top-to-top balancing first, then top-to-bottom balancing, or top-to-top and bottom-to-bottom balancing simultaneously, etc. The on-site commissioning personnel will modify the program settings to adjust these methods according to the actual on-site conditions.

[0026] 8. The nitrogen gas desorbed in adsorption tank B32 is discharged through throttling device G33, control valve K35, nitrogen discharge pipeline 4, and silencer 5.

[0027] 9. Repeat steps 1 to 8.

[0028] The beneficial effects of this invention are as follows: By employing multiple balancing methods—top-top, bottom-bottom, top-bottom, and various combinations thereof—oxygen-enriched air is kept at the top of the adsorption tank, while the low-concentration oxygen released is re-adsorbed to obtain oxygen-enriched air, thus improving the oxygen recovery rate and reducing air consumption. This reduces the required air compressor power and lowers the energy consumption for oxygen production. Throttling devices are installed on the inlet and outlet pipes of the adsorption tank to control the gas flow rate during tank balancing, preventing high-speed gas from impacting the molecular sieve. Throttling devices are also installed on the inlet pipe to control the flow rate of compressed air entering the adsorption tank, reducing the impact of airflow on the molecular sieve. Throttling devices are installed on the purging pipe to control the purging gas flow rate, reducing the consumption of oxygen-enriched air during purging. Finally, throttling devices are installed on the outlet pipe to control the flow rate of oxygen-enriched air entering the oxygen tank, preventing excessively fast gas production from causing poor adsorption and low gas concentration.

[0029] The experiment was conducted using a 40 cubic meter oxygen concentrator as the standard:

[0030]

Claims

1. A high-efficiency and energy-saving PSA oxygen generator, characterized in that: The system includes adsorption tank A (8) and adsorption tank B (32). The top of adsorption tank A (8) is connected to the top of adsorption tank B (32) via an I-shaped balance pipe (10), a first purge pipe (13), an oxygen outlet pipe (17), and a second purge pipe (26). The upper part of the I-shaped balance pipe (10) is equipped with control valves D (11) and I (30) to connect the tops of adsorption tank A (8) and adsorption tank B (32), while the lower part is equipped with control valves C (6) and J (34) to connect the adsorption tanks B (32). At the bottom of tank A (8) and adsorption tank B (32), the first purge pipeline (13) is a T-shaped pipeline and is connected to the top of the adsorption tank. Control valves E (12) and F (14) are installed on both sides of the pipeline. The first purge pipeline (13) is connected to the unqualified gas pipeline (24) and the venting pipeline (27). One-way valves A (16) and B (18) are installed on both sides of the oxygen outlet pipeline (17). The bottom of adsorption tank A (8) and adsorption tank B (32) are connected to the silencer (5) through the nitrogen discharge pipeline (4) and are located on both sides. Control valves B (3) and K (35) are respectively provided. The bottom of adsorption tanks A (8) and B (32) are connected to the inlet pipe (2), and control valves A (1) and L (36) are respectively provided on both sides. A purity measuring pipe (19) is branched off from the middle of the oxygen outlet pipe (17) for connecting to an oxygen purity meter. A ball valve (20) is provided on the purity measuring pipe (19). The end of the oxygen outlet pipe (17) is connected to a qualified gas pipe (21) and an unqualified gas pipe (24). The qualified gas pipe The pipeline (21) is equipped with a control valve G (22) and a throttling device D (23). The qualified gas pipeline (21) is connected to the oxygen tank. The unqualified gas pipeline (24) is equipped with a throttling device E (25) and its end is connected to a first purge pipeline (13) and an empty pipeline (27). The empty pipeline (27) is equipped with a control valve H (28) and a silencer B (29). The throttling device D (23) and the throttling device E (25) are reduced-diameter throttling valves, and the inner diameter of the throttling device D (23) is larger than the inner diameter of the throttling device E (25).

2. The high-efficiency and energy-saving PSA oxygen generator according to claim 1, characterized in that: A throttling element C (15) is provided on the second flushing pipeline (26), and the throttling element C (15) is a reduced-diameter throttling valve.

3. The high-efficiency and energy-saving PSA oxygen generator according to claim 1, characterized in that: A throttling element H (37) is connected in the middle of the intake pipe (2), and the throttling element H (37) is a reduced-diameter throttling valve.

4. The high-efficiency and energy-saving PSA oxygen generator according to claim 1, characterized in that: Throttling element B (9) and throttling element F (31) are respectively provided at the top of the adsorption tank A (8) and the adsorption tank B (32). The throttling element B (9) and throttling element F (31) are reduced-diameter throttling valves. Throttling element A (7) and throttling element G (33) are respectively provided at the bottom of the adsorption tank A (8) and the adsorption tank B (32). The throttling element A (7) and throttling element G (33) are reduced-diameter throttling valves.

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