Efficient and energy-saving PSA oxygen generator

Abstract

The invention relates to the technical field of medical oxygen generators, and discloses an efficient and 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] The invention relates to the technical field of medical oxygen generators, in particular to a high-efficiency and energy-saving PSA oxygen generator. Background Art

[0002] At present, PSA oxygen generators generally adopt a double-tower circulation oxygen production method. During the circulation process, one adsorption tank takes in air, adsorbs nitrogen, and produces oxygen. At the same time, the other adsorption tank analyzes nitrogen and empties it through a muffler until the pressure in the tank is 0MPa. The subsequent step is that the high-pressure adsorption tank balances the low-pressure adsorption tank. The purpose is to increase the pressure in the low-pressure adsorption tank and improve the adsorption effect. On the other hand, it is also to make full use of the oxygen-rich air at the top of the adsorption tank to improve the oxygen recovery rate. Existing oxygen generators generally use a top-to-top balance method to balance the top of the adsorption tank. At the end of the balance, part of the analyzed nitrogen also enters the top of the low-pressure adsorption tank, affecting the purity of the gas production, which reduces the oxygen recovery rate and increases the air consumption, thereby increasing the required air compressor power and the energy consumption required for oxygen production. Summary of the invention

[0003] The object of the present invention is to provide a high-efficiency and energy-saving PSA oxygen generator to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A high-efficiency and energy-saving PSA oxygen generator comprises 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 through an I-shaped balancing pipeline, a first purge pipeline, an oxygen outlet pipeline, and a second purge pipeline, respectively. The upper part of the I-shaped balancing pipeline is provided with a control valve D and a control valve I to communicate with the top of the adsorption tank A and the top of the adsorption tank B. The lower part of the pipeline is provided with a control valve C and a control valve J to communicate with the bottom of the adsorption tank A and the bottom of the adsorption tank B. The first purge pipeline is a T-shaped pipeline and is connected to the top of the adsorption tank. The control valve E and the control valve F are provided on both sides of the pipeline. The first purge pipeline (13) is connected to the unqualified gas pipeline and the emptying pipeline. The two sides of the oxygen outlet pipeline are provided with a one-way valve A and a one-way valve B. The bottoms of the adsorption tanks A and B are connected through a nitrogen outlet. The pipeline is connected to the silencer and is provided with a control valve B and a control valve K on both sides respectively. The bottoms of the adsorption tanks A and B are connected to the air inlet pipeline and are provided with a control valve A and a control valve L on both sides respectively. A purity measuring pipeline is separated from the middle of the oxygen outlet pipeline for connecting an oxygen purity meter. A ball valve is provided on the purity measuring pipeline. A qualified gas pipeline and an unqualified gas pipeline are connected to the end of the oxygen outlet pipeline. A control valve G and a throttle D are provided on the qualified gas pipeline. The qualified gas pipeline is connected to the oxygen tank. A throttle E is provided on the unqualified gas pipeline and the end is connected to a first purge pipeline and an emptying pipeline. A control valve H and a silencer B are provided on the emptying pipeline. The throttle D and the throttle E are reduced-diameter throttle valves and the inner diameter of the throttle D is larger than the inner diameter of the throttle E.

[0006] Furthermore, a throttling component C is provided on the second purge pipeline, and the throttling component C is a reducing throttle valve.

[0007] Furthermore, a throttling member H is connected to the middle of the air intake pipeline, and the throttling member H is a reduced-diameter throttle valve.

[0008] Furthermore, a throttling member B and a throttling member F are respectively arranged on the top of the adsorption tank A and the adsorption tank B, and the throttling member B and the throttling member F are reduced-diameter throttling valves. A throttling member A and a throttling member G are respectively arranged on the bottom of the adsorption tank A and the adsorption tank B, and the throttling member A and the throttling member G are reduced-diameter throttling valves.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The present invention uses a variety of balancing methods: top-top, bottom-bottom, top-bottom and various combined balancing methods, so that the oxygen-enriched air stays on the top of the adsorption tank, and the analyzed low-concentration oxygen is re-adsorbed to obtain oxygen-enriched air, thereby improving the oxygen recovery rate, thereby reducing the air consumption, reducing the required air compressor power, and reducing the energy consumption required for oxygen production. A throttling device is provided on the inlet and outlet pipelines of the adsorption tank to control the gas flow rate when the adsorption tank is balanced to avoid the impact of high-speed gas on the molecular sieve. A throttling device is provided on the air inlet pipeline of the adsorption tank to control the flow rate of compressed air entering the adsorption tank to reduce the impact of the airflow on the molecular sieve. A throttling device is provided on the purge pipeline to control the purge gas flow rate to reduce the oxygen-enriched air consumed in the purge process. A throttling device is provided on the oxygen outlet pipeline to control the flow rate of oxygen-enriched air entering the oxygen tank to avoid the adsorption tank producing too fast a gas flow rate, resulting in poor adsorption effect and low gas production concentration. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0012] In the figure: 1. Control valve A; 2. Air intake pipeline; 3. Control valve B; 4. Nitrogen exhaust pipeline; 5. Muffler A; 6. Control valve C; 7. Throttle A; 8. Adsorption tank A; 9. Throttle B; 10. I-shaped balance pipeline; 11. Control valve D; 12. Control valve E; 13. First purge pipeline; 14. Control valve F; 15. Throttle C; 16. Check valve A; 17. Oxygen outlet pipeline; 18. Check valve B; 19. Purity measurement pipeline; 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 purge pipeline; 27, exhaust pipeline; 28, control valve H; 29, muffler 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 DESCRIPTION

[0013] See also Figure 1In an 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 through an I-shaped balancing pipeline 10, a first purge pipeline 13, an oxygen outlet pipeline 17, and a second purge pipeline 26, respectively. The upper part of the I-shaped balancing pipeline 10 is provided with a control valve D11 and a control valve I30, which connect the top of the adsorption tank A8 and the adsorption tank B32. The lower part of the pipeline is provided with a control valve C6 and a control valve J34, which connect the bottom of the adsorption tank A8 and the adsorption tank B32. The first purge pipeline 13 is a T-shaped pipeline, and control valves E12 and control valves F14 are arranged on both sides of the pipeline connected to the top of the adsorption tank. Another pipeline of the T-shaped pipeline is connected to the unqualified gas pipeline 24 and the exhaust pipeline 27. Check valves A16 and B18 are arranged on both sides of the oxygen outlet pipeline 17. The bottoms of the adsorption tanks A8 and B32 are connected to the muffler 5 through the nitrogen exhaust pipeline 4, and control valves B3 and control valves K35 are arranged on both sides respectively. The bottoms of the adsorption tanks A8 and B32 are connected to the air intake pipeline 2, and control valves A1 and control valves L36 are arranged on both sides respectively.

[0014] A purity measuring pipeline 19 is separated from the middle of the oxygen outlet pipeline 17, which is used to connect the purity meter to measure the purity of the gas production. A ball valve 20 is provided on the purity measuring pipeline 19. The end of the oxygen outlet pipeline 17 is divided into two pipelines: a qualified gas pipeline 21 and an unqualified gas pipeline 24. The qualified gas pipeline 21 is provided with a control valve G22 and a throttle D23, and the pipeline is connected to the oxygen tank. The unqualified gas pipeline 24 is provided with a throttle E25, and the end is divided into two pipelines: a first purge pipeline 13 and an emptying pipeline 27. The emptying pipeline 27 is provided with a control valve H28 and a muffler B29. The throttle D23 and the throttle E25 are reduced-diameter throttle valves, and the inner diameter of the throttle D23 is larger than the inner diameter of the throttle E25 hole.

[0015] Furthermore, a throttling element C15 is provided on the second purge pipeline 26, and the throttling element C15 is a reducing throttle valve.

[0016] Furthermore, a throttle member H37 is connected to the middle of the air intake pipe 2, and the throttle member H37 is a reduced-diameter throttle valve.

[0017] Furthermore, a throttle B9 and a throttle F31 are respectively arranged on the top of the adsorption tank A8 and the adsorption tank B32, and the throttle B9 and the throttle F31 are reduced-diameter throttle valves. A throttle A7 and a throttle G33 are respectively arranged on the bottom of the adsorption tank A8 and the adsorption tank B32, and the throttle A7 and the throttle G33 are reduced-diameter throttle valves.

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

[0019] 1. The dried and purified compressed air enters the adsorption tank A8 through the throttle H37, the air inlet line 2 and the control valve A1. The oxygen-enriched air produced by the adsorption tank A8 passes through the throttle B9, the one-way valve A16 and the oxygen outlet line 17. Part of the oxygen-enriched air passes through the ball valve 20 and the purity measuring line 19 and enters the oxygen purity meter. After being tested by the oxygen purity meter, if the purity is qualified and higher than 90%, the control valve G22 opens, and the oxygen-enriched air produced by the adsorption tank A8 continues to pass through the qualified air line 21, the control valve G22 and the throttle D23 to enter the oxygen tank. If the purity is lower than a certain set value, the control valve H28 opens, and the oxygen-enriched air produced by the adsorption tank A8 is discharged. The oxygen-enriched air continues to be discharged through the unqualified gas pipeline 24, the throttle E25, the exhaust pipeline 27, the control valve H28 and the muffler B29. If the purity is higher than a certain set value and lower than 90%, the control valve F14 and the control valve K35 are opened, and the oxygen-enriched air produced by the adsorption tank A8 continues to be discharged through the unqualified gas pipeline 24, the throttle E25, the first purge pipeline 13, the control valve F14, the throttle F31, the adsorption tank B32, the throttle G33, the control valve K35, the nitrogen exhaust pipeline 4 and the muffler 5. This process realizes the molecular sieve purging of the adsorption tank B32 and the effect of emptying the unqualified oxygen.

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

[0021] 3. A part of the oxygen in the adsorption tank A8 enters the top of the adsorption tank B32 through the throttle B9, the control valve D11, the I-shaped balancing pipeline 10, the control valve I30, and the throttle F31, realizing the top balancing process of the adsorption tank A8 on the adsorption tank B32. At the same time, another part of the oxygen in the adsorption tank A8 enters the bottom of the adsorption tank B32 through the throttle B9, the control valve D11, the I-shaped balancing pipeline 10, the control valve J34, and the throttle G33, realizing the bottom balancing process of the adsorption tank A8 on the adsorption tank B32. There are many other ways for this balancing process, such as: top-top balancing first, then top-bottom balancing, top-top and bottom-bottom balancing at the same time, etc. The on-site debugging personnel shall modify the program settings and make adjustments according to the actual situation on site.

[0022] 4. The nitrogen analyzed in the adsorption tank A8 is discharged through the throttling piece A7, the control valve B3, the nitrogen exhaust pipeline 4, and the muffler 5.

[0023] 5. Switch the adsorption tank B32. The compressed air enters the adsorption tank B32 through the throttle H37, the air inlet line 2, the control valve L36 and the throttle G33. The oxygen-enriched air produced by the adsorption tank B32 passes through the throttle F31, the one-way valve B18 and the oxygen outlet line 17. Part of the oxygen-enriched air passes through the ball valve 20 and the purity measuring line 19 and enters the oxygen purity meter. After being tested by the oxygen purity meter, if the purity is qualified and higher than 90%, the control valve G22 opens. The oxygen-enriched air produced by the adsorption tank B32 continues to pass through the qualified air line 21, the control valve G22 and the throttle D23 to enter the oxygen tank. If the purity is lower than a certain set value, the control valve H28 opens. The oxygen-enriched air produced by the adsorption tank B32 continues to be emptied through the unqualified gas pipeline 24, the throttle E25, the exhaust pipeline 27, the control valve H28 and the muffler B29. If the purity is higher than a certain set value and lower than 90%, the control valve E12 and the control valve B3 are opened, and the oxygen-enriched air produced by the adsorption tank B32 continues to be emptied through the unqualified gas pipeline 24, the throttle E25, the first purge pipeline 13, the control valve E12, the throttle B9, the adsorption tank A8, the throttle A7, the control valve B3, the nitrogen exhaust pipeline 4 and the muffler 5. This process realizes the molecular sieve purging work of the adsorption tank A8 and the effect of exhausting unqualified oxygen.

[0024] 6. The oxygen produced by the adsorption tank B32 enters the adsorption tank A8 through the throttle C15, the second purge pipeline 26 and the throttle B9. The exhaust gas analyzed in the adsorption tank A8 is discharged through the throttle A7, the control valve B3, the nitrogen exhaust pipeline 4 and the muffler 5.

[0025] 7. A part of the oxygen in the adsorption tank B32 enters the top of the adsorption tank A8 through the throttling piece F31, the control valve I30, the I-shaped balancing pipeline 10, the control valve D11, and the throttling piece B9, so as to realize the top balancing process of the adsorption tank B32 on the adsorption tank A8. Meanwhile, another part of the oxygen in the adsorption tank B32 enters the bottom of the adsorption tank A8 through the throttling piece F31, the control valve I30, the I-shaped balancing pipeline 10, the control valve C6, and the throttling piece A7, so as to realize the bottom balancing process of the adsorption tank B32 on the adsorption tank A8. There are many other ways for this balancing process, such as: top-to-top balancing first, then top-to-bottom balancing, top-to-top and bottom-to-bottom balancing at the same time, etc. The on-site debugging personnel shall modify the program settings and make adjustments according to the actual situation on site.

[0026] 8. The nitrogen analyzed in the adsorption tank B32 is discharged through the throttling piece G33, the control valve K35, the nitrogen exhaust pipeline 4, and the muffler 5.

[0027] 9. Repeat steps 1 to 8.

[0028] The beneficial effects of the present invention are as follows: through a variety of balancing methods: top-top, bottom-bottom, top-bottom and various combined balancing methods, the oxygen-enriched air stays on the top of the adsorption tank, and the analyzed low-concentration oxygen is re-adsorbed to obtain oxygen-enriched air, thereby improving the oxygen recovery rate, thereby reducing the air consumption, reducing the required air compressor power, and reducing the energy consumption required for oxygen production. A throttling device is provided on the inlet and outlet pipelines of the adsorption tank to control the gas flow rate when the adsorption tank is balanced to avoid the impact of high-speed gas on the molecular sieve. A throttling device is provided on the air inlet pipeline of the adsorption tank to control the flow rate of compressed air entering the adsorption tank to reduce the impact of the airflow on the molecular sieve. A throttling device is provided on the purge pipeline to control the purge gas flow rate to reduce the oxygen-enriched air consumed in the purge process. A throttling device is provided on the oxygen outlet pipeline to control the flow rate of oxygen-enriched air entering the oxygen tank to avoid the adsorption tank producing too fast a gas flow rate, resulting in poor adsorption effect and low gas production concentration.

[0029] Tested with a 40 cubic meter oxygen concentrator as the standard:

[0030]

Claims

1. A high-efficiency and energy-saving PSA oxygen generator, comprising an adsorption tank A (8) and an adsorption tank B (32), wherein the top of the adsorption tank A (8) is connected to the top of the adsorption tank B (32) through an I-shaped balancing pipeline (10), a first purge pipeline (13), an oxygen outlet pipeline (17), and a second purge pipeline (26), respectively; the upper half of the I-shaped balancing pipeline (10) is provided with a control valve D (11) and a control valve I (30) to connect the tops of the adsorption tanks A (8) and B (32), and the lower half of the pipeline is provided with a control valve C (6), a control valve D (11) and a control valve I (30) to connect the tops of the adsorption tanks A (8) and B (32), and the lower half of the pipeline is provided with a control valve C (6), a control valve D (11) and a control valve I (30) to connect the tops of the adsorption tanks A (8) and B (32). The control valve J (34) is connected to the bottom of the adsorption tank A (8) and the adsorption tank B (32). The first purge pipeline (13) is a T-shaped pipeline and is connected to the top of the adsorption tank. The control valve E (12) and the control valve F (14) are arranged on both sides of the pipeline. The first purge pipeline (13) is connected to the unqualified gas pipeline (24) and the exhaust pipeline (27). The two sides of the oxygen outlet pipeline (17) are provided with a check valve A (16) and a check valve B (18). The bottom of the adsorption tank A (8) and the adsorption tank B (32) are connected to the silencer (24) through the nitrogen exhaust pipeline (4). 5) and are respectively provided with a control valve B (3) and a control valve K (35); the bottoms of the adsorption tanks A (8) and B (32) are connected to the air inlet pipeline (2) and are respectively provided with a control valve A (1) and a control valve L (36) on both sides; a pipeline for measuring purity (19) is separated from the middle of the oxygen outlet pipeline (17) for connecting to an oxygen purity meter; a ball valve (20) is provided on the purity measuring pipeline (19); the ends of the oxygen outlet pipeline (17) are connected to a qualified gas pipeline (21) and an unqualified gas pipeline (24); The qualified gas pipeline (21) is provided with a control valve G (22) and a throttle D (23). The qualified gas pipeline (21) is connected to an oxygen tank. The unqualified gas pipeline (24) is provided with a throttle E (25) and the end thereof is connected to a first purge pipeline (13) and an exhaust pipeline (27). The exhaust pipeline (27) is provided with a control valve H (28) and a muffler B (29). The throttle D (23) and the throttle E (25) are reduced-diameter throttle valves, and the inner diameter of the throttle D (23) is larger than the inner diameter of the throttle E (25).

2. A 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 purge pipeline (26), and the throttling element C (15) is a reducing throttle valve.

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

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

Images