Energy-saving pressure swing adsorption oxygen production equipment

Abstract

An energy-saving pressure swing adsorption oxygen production equipment, characterized in that: comprising a first adsorption tower, a second adsorption tower, a second pipeline, a fourth pipeline, an oxygen buffer tank, an oxygen dust filter, an oxygen analyzer, an outlet oxygen flow meter and a programmable control system. The energy-saving pressure swing adsorption oxygen production equipment optimizes the design of the adsorption tower structure and the pipeline, the time required for the gas pressure in the adsorption tower to drop to normal pressure due to working pressure (i.e. emptying time) is only 2-3 seconds, and the amount of regeneration gas required is only about 70% of that of similar equipment, thereby improving the oxygen recovery rate and saving energy. Through the application of the unequal potential equal pressure process, the oxygen production rate and oxygen recovery rate of the equipment are higher, thereby reducing the energy consumption per unit volume of product gas.

Description

Technical Field

[0001] This utility model relates to the field of oxygen generation equipment, specifically to an energy-saving pressure swing adsorption oxygen generation device. Background Technology

[0002] Pressure Swing Adsorption (PSA) oxygen production is an air separation oxygen production method. It primarily utilizes zeolite molecular sieves to selectively adsorb oxygen and nitrogen from the air. Through pressure adsorption and depressurization desorption, oxygen and nitrogen are separated to produce oxygen. It differs from cryogenic oxygen production methods and offers advantages such as a simple process flow, low equipment investment, low energy consumption, low-pressure operation, and ease of maintenance and repair. Due to these advantages, PSA oxygen production units are widely used in various fields, including non-ferrous metal smelting (copper, zinc, lead, gold, nickel, titanium dioxide, etc.), ferrous metal smelting (blast furnace oxygen-enriched pulverized coal ironmaking, electric arc furnace steelmaking, etc.), oxygen-enriched combustion (industrial boilers, glass furnaces, electrolytic aluminum), chemical gasification (synthetic ammonia, methanol, ethylene, ethylene glycol production, etc.), healthcare, wastewater treatment, pulp bleaching, hydrogen peroxide production, ozone generation, aquaculture, and carbon black production.

[0003] Current oxygen generation equipment suffers from high energy consumption and low oxygen production rate during operation.

[0004] To effectively solve this problem, it is necessary to design and provide an energy-saving pressure swing adsorption oxygen generator, hence this application is submitted. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides an energy-saving pressure swing adsorption oxygen generator.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An energy-saving pressure swing adsorption (PSA) oxygen generator is characterized by comprising a first adsorption tower, a second adsorption tower, a second pipeline, a fourth pipeline, an oxygen buffer tank, an oxygen dust filter, an oxygen analyzer, an outlet oxygen flow meter, and a programmable control system. A first shut-off valve is installed at the front end of the second pipeline, which is connected to both the first and second adsorption towers. A third pneumatic valve is installed between the second pipeline and the first adsorption tower, and a fourth pneumatic valve is installed between the second pipeline and the second adsorption tower. A fourth pipeline is installed at the outlets of the first and second adsorption towers, and a seventh pneumatic valve is installed between the first adsorption tower and the fourth pipeline. An eighth pneumatic valve is provided between the second adsorption tower and the fourth pipeline. The fourth pipeline is connected to an oxygen buffer tank. A second shut-off valve and a one-way valve are provided between the fourth pipeline and the oxygen buffer tank. The outlet end of the oxygen buffer tank is connected to an oxygen dust filter. The outlet end of the oxygen dust filter is connected to an outlet oxygen flow meter. A second pressure regulating valve and an oxygen analyzer are provided between the oxygen dust filter and the outlet oxygen flow meter. The outlet end of the outlet oxygen flow meter is connected to the fourth shut-off valve. The outlet end of the fourth shut-off valve is connected to a sixth pipeline. The outlet end of the sixth pipeline is connected to an eleventh pneumatic valve and a twelfth pneumatic valve, respectively.

[0008] Preferably, the inlet ends of the first adsorption tower and the second adsorption tower are also connected to a first pipeline, the first pipeline and the second pipeline are connected in parallel, a first pneumatic valve is provided between the first pipeline and the first adsorption tower, a second pneumatic valve is provided between the first pipeline and the second adsorption tower, and a branch pipeline is also provided on the first pipeline, and a silencer is provided on the branch pipeline.

[0009] Preferably, the inlet ends of the first adsorption tower and the second adsorption tower are also connected to a third pipeline. The third pipeline is connected in parallel with the second pipeline. A fifth pneumatic valve is provided between the third pipeline and the first adsorption tower. A sixth pneumatic valve is provided between the third pipeline and the second adsorption tower. The third pipeline is connected to a fourth pipeline. Its extension section is also provided with a first pressure regulating valve and a first flow meter. The flow meter is connected to a third shut-off valve.

[0010] Preferably, the outlet ends of the first adsorption tower and the second adsorption tower are also connected to a fifth pipeline, the fifth pipeline is connected in parallel with the fourth pipeline, the other end of the third shut-off valve is connected to the fifth pipeline, a tenth pneumatic valve is provided between the fifth pipeline and the first adsorption tower, and a ninth pneumatic valve is provided between the fifth pipeline and the second adsorption tower.

[0011] Preferably, the oxygen buffer tank is provided with a first drain pipe at the bottom, and the oxygen dust filter is provided with a second drain pipe at the bottom.

[0012] This utility model has the following beneficial effects:

[0013] This energy-saving pressure swing adsorption (PSA) oxygen generator, through optimized design of the adsorption tower structure and pipelines, reduces the time required for the gas pressure inside the adsorption tower to drop to atmospheric pressure (i.e., the venting time) to only 2-3 seconds. The required amount of regeneration gas is only about 70% of that of similar equipment, thereby improving the oxygen recovery rate and saving energy. Through the application of the unequal pressure equalization process, the oxygen production rate and oxygen recovery rate of the equipment can be further increased, thereby reducing the energy consumption per unit volume of product gas. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an energy-saving pressure swing adsorption oxygen generator proposed in this utility model;

[0015] Figure label:

[0016] 1. First shut-off valve; 2. First adsorption tower; 3. First pipeline; 4. First pneumatic valve; 5. Second pneumatic valve; 6. Branch pipeline; 7. Silencer; 8. Third pneumatic valve; 9. Fourth pneumatic valve; 10. Second pipeline; 11. Sixth pneumatic valve; 12. Third pipeline; 13. Fifth pneumatic valve; 14. Second adsorption tower; 15. Eighth pneumatic valve; 16. Fourth pipeline; 17. Fifth pipeline; 18. Ninth pneumatic valve; 19. Seventh pneumatic valve; 20. Second shut-off valve 21. Valve; 22. Check valve; 23. First drain pipe; 24. Third shut-off valve; 25. First flow meter; 26. First pressure regulating valve; 27. Tenth pneumatic valve; 28. Second drain pipe; 29. ​​Programmable control system; 30. Oxygen buffer tank; 31. Eleventh pneumatic valve; 32. Sixth pipeline; 33. Twelfth pneumatic valve; 34. Fourth shut-off valve; 35. Outlet oxygen flow meter; 36. Oxygen analyzer; 37. Second pressure regulating valve; 38. Oxygen dust filter. Detailed Implementation

[0017] To make the objectives and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] like Figure 1As shown in the figure, an energy-saving pressure swing adsorption (PSA) oxygen generator provided by this utility model includes a first adsorption tower 2, a second adsorption tower 14, a second pipeline 10, a fourth pipeline 16, an oxygen buffer tank 29, an oxygen dust filter 37, an oxygen analyzer 35, an outlet oxygen flow meter 34, and a programmable control system 28. A first shut-off valve 1 is provided at the front end of the second pipeline 10. The second pipeline 10 is connected to both the first adsorption tower 2 and the second adsorption tower 14. A third pneumatic valve 8 is provided between the second pipeline 10 and the first adsorption tower 2, and a fourth pneumatic valve 9 is provided between the second pipeline 10 and the second adsorption tower 14. The outlets of the first adsorption tower 2 and the second adsorption tower 14 are connected to the fourth pipeline 16. A seventh gas exchange is provided between the first adsorption tower 2 and the fourth pipeline 16. An eighth pneumatic valve 15 is provided between the second adsorption tower 14 and the fourth pipeline 16. The fourth pipeline 16 is connected to the oxygen buffer tank 29. A second shut-off valve 20 and a one-way valve 21 are provided between the fourth pipeline 16 and the oxygen buffer tank 29. The outlet end of the oxygen buffer tank 29 is connected to the oxygen dust filter 37. The outlet end of the oxygen dust filter 37 is connected to the outlet oxygen flow meter 34. A second pressure regulating valve 36 and an oxygen analyzer 35 are provided between the oxygen dust filter 37 and the outlet oxygen flow meter 34. The outlet end of the outlet oxygen flow meter 34 is connected to the fourth shut-off valve 33. The outlet end of the fourth shut-off valve 33 is connected to the sixth pipeline 31. The outlet end of the sixth pipeline 31 is connected to the eleventh pneumatic valve 30 and the twelfth pneumatic valve 32 respectively.

[0019] Furthermore, the inlet ends of the first adsorption tower 2 and the second adsorption tower 14 are also connected to the first pipeline 3. The first pipeline 3 is connected in parallel with the second pipeline 10. A first pneumatic valve 4 is provided between the first pipeline 3 and the first adsorption tower 2, and a second pneumatic valve 5 is provided between the first pipeline 3 and the second adsorption tower 14. A branch pipeline 6 is also provided on the first pipeline 3, and a silencer 7 is provided on the branch pipeline 6.

[0020] Furthermore, the inlet ends of the first adsorption tower 2 and the second adsorption tower 14 are also connected to the third pipeline 12. The third pipeline 12 is connected in parallel with the second pipeline 10. A fifth pneumatic valve 13 is provided between the third pipeline 12 and the first adsorption tower 2. A sixth pneumatic valve 11 is provided between the third pipeline 12 and the second adsorption tower 14. The third pipeline 12 is connected to the fourth pipeline 16. Its extension section is also provided with a first pressure regulating valve 25 and a first flow meter 24. The flow meter is connected to the third shut-off valve 23.

[0021] Furthermore, the outlet ends of the first adsorption tower 2 and the second adsorption tower 14 are also connected to the fifth pipeline 17. The fifth pipeline 17 is connected in parallel with the fourth pipeline 16. The other end of the third shut-off valve 23 is connected to the fifth pipeline 17. A tenth pneumatic valve 26 is provided between the fifth pipeline 17 and the first adsorption tower 2, and a ninth pneumatic valve 18 is provided between the fifth pipeline 17 and the second adsorption tower 14.

[0022] Furthermore, the bottom of the oxygen buffer tank 29 is provided with a first drain pipe 22, and the bottom of the oxygen dust filter 37 is provided with a second drain pipe 27.

[0023] Working principle:

[0024] Clean compressed air passes through the first shut-off valve 1, then through the third pneumatic valve 8 and the fourth pneumatic valve 9, before entering the first adsorption tower 2 and the second adsorption tower 14. The first adsorption tower 2 and the second adsorption tower 14 are filled with zeolite molecular sieves. Utilizing the different adsorption capacities of different components in the gas medium on the adsorbent, the generated oxygen passes through the seventh pneumatic valve 19, the eighth pneumatic valve 15, the one-way valve 21, and the second shut-off valve 20 before entering the oxygen buffer tank 29. After being filtered for dust by the oxygen dust filter 37, the oxygen is then regulated to the customer's required working pressure by the second pressure regulating valve 36. It then enters the oxygen analyzer 35 for oxygen purity testing, and finally enters the outlet oxygen flow meter 34 for metering, before being adjusted to the customer's required flow rate by the fourth shut-off valve 33. When the oxygen analyzer 35 detects that the oxygen purity meets the customer's requirements, the twelfth pneumatic valve 32 opens to supply gas to the customer. If the oxygen analyzer 35 detects that the oxygen purity does not meet the customer's requirements, the eleventh pneumatic valve 30 opens to release the oxygen into the atmosphere, without affecting the customer's gas supply.

[0025] The specific implementation process is as follows:

[0026] Step 1: Pressure Equalization: Open the seventh pneumatic valve 19 and the eighth pneumatic valve 15, and close the other valves. This step equalizes the pressure of the high-purity oxygen in the upper part of the second adsorption tower 14 to the first adsorption tower 2, thereby increasing the oxygen purity in the first adsorption tower 2.

[0027] Step 2: Unequal pressure equalization: The fifth pneumatic valve 13 and the eighth pneumatic valve 15 are opened, and the other valves are closed. In the unequal pressure equalization process, when an adsorption tower finishes adsorption, there is a certain gradient in the oxygen purity inside it. The closer to the top of the adsorption tower, the higher the oxygen purity.

[0028] Step 3: Adsorption occurs in the first adsorption tower 2, and regeneration occurs in the second adsorption tower 14. This step is as follows:

[0029] 1) The second adsorption tower 14 is vented, the second pneumatic valve 5, the third pneumatic valve 8, and the seventh pneumatic valve 19 are opened, and the other valves are closed. This step is for the first adsorption tower 2 to produce gas. After pressure equalization, the pressure in the second adsorption tower 14 is about half of the adsorption pressure, generally 0.3-0.4 MPa. It takes about 3-8 seconds for the pressure in the second adsorption tower 14 to drop to atmospheric pressure.

[0030] 2): Open the tenth pneumatic valve 26, and the zeolite molecular sieve in the second adsorption tower 14 begins to be cleaned. The pressure of the product gas well is adjusted to about 3 kg by the pressure regulating valve, and the pressure is adjusted to more than 200% of the product gas by the first flow meter 24, so that it is fully regenerated.

[0031] Step 4: Close the second pneumatic valve 5, the third pneumatic valve 8, the seventh pneumatic valve 19, and open the tenth pneumatic valve 26 to prepare for switching between the first adsorption tower 2 and the second adsorption tower 14.

[0032] Step 5: Pressure Equalization: Open the seventh pneumatic valve 19 and the eighth pneumatic valve 15, and close the other valves. This step equalizes the pressure of the high-purity oxygen in the upper part of the second adsorption tower 14 to the first adsorption tower 2, thereby increasing the oxygen purity in the first adsorption tower 2.

[0033] Step 6: Unequal Pressure Equalization: Open the fourth pneumatic valve 9 and the seventh pneumatic valve 19, and close the other valves. In the unequal pressure equalization process, when an adsorption tower finishes adsorption, there is a certain gradient in the oxygen purity inside it. The closer to the top of the adsorption tower, the higher the oxygen purity. The oxygen production rate and oxygen recovery rate are both higher, thereby reducing the energy consumption per unit volume of product gas.

[0034] Step 7: Adsorption occurs in the second adsorption tower 14, and regeneration occurs in the first adsorption tower 2. This step is as follows:

[0035] 1) The first adsorption tower 2 is vented, the first pneumatic valve 4, the fourth pneumatic valve 9, and the eighth pneumatic valve 15 are opened, and the other valves are closed. This step is for the first adsorption tower 2 to produce gas. After pressure equalization, the pressure in the second adsorption tower 14 is about half of the adsorption pressure, generally 0.3-0.4 MPa. It takes about 3-8 seconds for the pressure in the second adsorption tower 14 to drop to atmospheric pressure.

[0036] 2): Open the ninth pneumatic valve 18, and the zeolite molecular sieve in the second adsorption tower 14 begins to be cleaned. The pressure regulating valve of the product gas well is adjusted to about 3 kg, and the pressure is adjusted to more than 200% of the product gas through the first flow meter 24. Sufficient regeneration has been achieved.

[0037] Step 8: Close the first pneumatic valve 4, the fourth pneumatic valve 9, the eighth pneumatic valve 15, and open the ninth pneumatic valve 18 to prepare for switching between the first adsorption tower 2 and the second adsorption tower 14.

[0038] This cycle continues.

[0039] In summary, through the optimized design of the adsorption tower structure and pipeline, this utility model reduces the time required for the gas pressure inside the adsorption tower to drop to atmospheric pressure (i.e., the venting time) to only 2-3 seconds, and the required amount of regeneration gas is only about 70% of that of similar equipment. This improves the oxygen recovery rate and saves energy. By applying the unequal pressure equalization process, the oxygen production rate and oxygen recovery rate of the equipment can be further increased, thereby reducing the energy consumption per unit volume of product gas.

[0040] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An energy-saving pressure swing adsorption (PSA) oxygen generator, characterized in that: The system includes a first adsorption tower, a second adsorption tower, a second pipeline, a fourth pipeline, an oxygen buffer tank, an oxygen dust filter, an oxygen analyzer, an outlet oxygen flow meter, and a programmable control system. The second pipeline has a first shut-off valve at its front end and is connected to both the first and second adsorption towers. A third pneumatic valve connects the second pipeline to the first adsorption tower, and a fourth pneumatic valve connects the second pipeline to the second adsorption tower. A fourth pipeline connects to the outlets of both the first and second adsorption towers. A seventh pneumatic valve connects the first adsorption tower to the fourth pipeline. The second adsorption tower is connected to the first... An eighth pneumatic valve is provided between the four pipelines. The fourth pipeline is connected to the oxygen buffer tank. A second shut-off valve and a one-way valve are provided between the fourth pipeline and the oxygen buffer tank. The outlet end of the oxygen buffer tank is connected to the oxygen dust filter. The outlet end of the oxygen dust filter is connected to the outlet oxygen flow meter. A second pressure regulating valve and an oxygen analyzer are provided between the oxygen dust filter and the outlet oxygen flow meter. The outlet end of the outlet oxygen flow meter is connected to the fourth shut-off valve. The outlet end of the fourth shut-off valve is connected to the sixth pipeline. The outlet end of the sixth pipeline is connected to the eleventh and twelfth pneumatic valves respectively.

2. The energy-saving pressure swing adsorption oxygen production device according to claim 1, characterized in that: The inlet ends of the first adsorption tower and the second adsorption tower are also connected to a first pipeline. The first pipeline and the second pipeline are connected in parallel. A first pneumatic valve is provided between the first pipeline and the first adsorption tower. A second pneumatic valve is provided between the first pipeline and the second adsorption tower. A branch pipeline is also provided on the first pipeline. A silencer is provided on the branch pipeline.

3. The energy-saving pressure swing adsorption oxygen production device according to claim 1, characterized in that: The inlet ends of the first adsorption tower and the second adsorption tower are also connected to a third pipeline. The third pipeline is connected in parallel with the second pipeline. A fifth pneumatic valve is provided between the third pipeline and the first adsorption tower. A sixth pneumatic valve is provided between the third pipeline and the second adsorption tower. The third pipeline is connected to a fourth pipeline. Its extension section is also provided with a first pressure regulating valve and a first flow meter. The flow meter is connected to a third shut-off valve.

4. The energy-saving pressure swing adsorption oxygen production device according to claim 3, characterized in that: The outlets of the first and second adsorption towers are also connected to a fifth pipeline, which is connected in parallel with the fourth pipeline. The other end of the third shut-off valve is connected to the fifth pipeline. A tenth pneumatic valve is provided between the fifth pipeline and the first adsorption tower, and a ninth pneumatic valve is provided between the fifth pipeline and the second adsorption tower.

5. The energy-saving pressure swing adsorption oxygen production device according to claim 1, characterized in that: The oxygen buffer tank is provided with a first drain pipe at the bottom, and the oxygen dust filter is provided with a second drain pipe at the bottom.

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