Pressure swing adsorption oxygen generating device with adjustable oxygen purity

Abstract

This invention relates to a pressure swing adsorption (PSA) oxygen generator with adjustable oxygen purity, belonging to the field of oxygen generation technology. The technical solution includes an air compression filtration unit, a first transmission unit, an adsorption unit, a second transmission unit, a pure oxygen storage tank, an oxygen-enriched storage tank, a third transmission unit, and a desorption unit. The air compression filtration unit is connected to the adsorption unit via the first transmission unit; the pure oxygen storage tank and the oxygen-enriched storage tank are connected to the adsorption unit via the second transmission unit; and the desorption unit is connected to the adsorption unit via the third transmission unit. Beneficial effects: The oxygen generator of this invention offers advantages such as flexible switching of oxygen generation conditions, improved molecular sieve efficiency and service life, energy saving and efficiency enhancement, carbon dioxide emission reduction, improved thermal efficiency and nitrogen oxide emission control, high degree of automation, and high product purity and recovery rate. It is of great significance for promoting energy conservation, carbon reduction, and environmental upgrading of industrial furnaces and boilers.

Description

Technical Field

[0001] This invention relates to the field of oxygen production technology, and more specifically to a flexible pressure swing adsorption oxygen production device with adjustable pure oxygen concentration. Background Technology

[0002] Oxygen is an important industrial gas, widely used in industries such as steel, non-ferrous metallurgy, chemicals, furnace energy conservation, glass, wastewater treatment, and waste incineration. Pressure swing adsorption (PSA) oxygen generation technology is widely used due to its numerous advantages, including mature technology, low investment, small footprint, simple operation, energy saving, and on-demand availability. Conventional PSA oxygen generation units mainly employ a two-tower process, producing oxygen with a purity of 93% ± 2%.

[0003] In recent years, under the dual carbon background, many enterprises have applied oxygen-enriched (23% to 55%) combustion technology in their industrial furnaces and boilers to achieve energy saving and carbon reduction.

[0004] Chinese utility model patent CN 216604667 U discloses a high-efficiency adjustable pressure swing adsorption (PSA) series oxygen generator, comprising: an air tank, a first adsorption tower, a second adsorption tower, a first membrane separation tower, a second membrane separation tower, a vacuum pump unit, and an oxygen collection tank. The first and second adsorption towers are connected in series via air manifolds, each equipped with multiple control valves. The air tank is connected to the first and second adsorption towers via a main air inlet pipe. The first and second adsorption towers are connected to the first and second membrane separation towers via a main air outlet pipe. The first and second membrane separation towers are connected in series via oxygen manifolds, each equipped with multiple control valves. The first and second membrane separation towers are connected to the oxygen collection tank via a main oxygen pipe, which is also equipped with a control valve. The vacuum pump unit is located on the main oxygen pipe. This utility model features a high degree of automation, convenient product purity adjustment, and high purity and recovery rate of the product gas.

[0005] Chinese utility model patent CN210528465 U discloses a pressure swing adsorption (PSA) oxygen generator, comprising an air compressor, an air purification component, an adsorption tower, and an oxygen storage tank connected in sequence by pipelines. The oxygen storage tank has a waste gas vent that is connected to the adsorption tower, and a valve is installed at the waste gas vent. A front air tank is provided between the air compressor and the air purification component. The inlet of the front air tank is connected to the air compressor, and its outlet is connected to the air purification component. This design avoids instantaneous overload caused by the filter in the air purification component directly supplying gas to the adsorption tower for rapid pressurization, resulting in a more stable air pressure entering the adsorption tower. During adsorption tower regeneration, the waste gas is used to purge and replace the packing material in the adsorption tower, saving oxygen. At the same time, this device also facilitates monitoring the status of the packing material in the adsorption tower.

[0006] Existing pressure swing adsorption (PSA) oxygen generators primarily produce oxygen with a purity of 93% ± 2%. Although the purity of the produced oxygen is adjustable from 50% to 93%, consistently producing oxygen with a purity below 55% significantly reduces the efficiency of the molecular sieve, affecting its lifespan and increasing energy consumption. Furthermore, oxygen products of different purities interfere with each other. If pure oxygen is produced first and then mixed with air to produce oxygen-enriched oxygen, it typically requires two mixing processes before entering the burner, leading to unstable oxygen purity and consequently unstable combustion. In other words, existing oxygen generators cannot fully meet the demands of oxygen-enriched applications. Summary of the Invention

[0007] To address the aforementioned technical problems in existing technologies, this invention provides a pressure swing adsorption (PSA) oxygen generator with adjustable oxygen purity. This generator allows for flexible switching between pure oxygen and oxygen-enriched operating conditions to meet usage requirements, and oxygen products of different purities do not interfere with each other. It can replace SCR / SNCR denitrification technology to achieve ultra-low nitrogen oxide emissions from pyrolysis furnaces, reduce flue gas emissions, lower fuel gas consumption, and achieve energy saving, efficiency improvement, carbon dioxide emission reduction, and increased thermal efficiency.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] This invention ensures that pure oxygen and oxygen-enriched oxygen do not interfere with each other during production and storage by using precise programmable valve control and a reasonable combination of adsorption towers, thus guaranteeing the stability of product quality.

[0010] This invention provides a pressure swing adsorption oxygen generator with adjustable oxygen purity. The oxygen generator is used to produce oxygen-enriched or pure oxygen. The oxygen generator includes an air compression and filtration unit, a first transmission unit, an adsorption unit, a second transmission unit, a pure oxygen storage tank, an oxygen-enriched storage tank, a third transmission unit, and a desorption unit.

[0011] The air compression and filtration unit is connected to the adsorption unit through the first transmission unit, the pure oxygen storage tank and the oxygen-enriched storage tank are connected to the adsorption unit through the second transmission unit, and the desorption unit is connected to the adsorption unit through the third transmission unit.

[0012] Furthermore, the air compression and filtration unit includes an air compressor, an air buffer tank, a Class C filter, a refrigerated dryer, a Class T filter, and a Class A filter connected in sequence.

[0013] The Class A filter is connected to the first transmission unit.

[0014] Furthermore, the first transmission unit includes a first programmable valve, a second programmable valve, a third programmable valve, a fourth programmable valve, a fifth programmable valve, a sixth programmable valve, a seventh programmable valve, and an eighth programmable valve;

[0015] The first end of the first programmable valve is connected to the air compression and filtration unit. The second end of the first programmable valve is simultaneously connected to the first end of the second programmable valve and the first end of the third programmable valve. The second ends of the second programmable valve and the second ends of the third programmable valve are respectively connected to the inlet of the first adsorption tower and the inlet of the second adsorption tower.

[0016] The first end of the fourth programmable valve is connected to the air compression and filtration unit. The second end of the fourth programmable valve is connected to the first end of both the fifth and sixth programmable valves. The second ends of the fifth and sixth programmable valves are respectively connected to the inlet of the third adsorption tower and the inlet of the fourth adsorption tower.

[0017] The first end of the seventh control valve is connected to the outlet of the first adsorption tower, and the second end of the seventh control valve is connected to the inlet of the third adsorption tower.

[0018] The first end of the eighth programmable valve is connected to the outlet of the second adsorption tower, and the second end of the eighth programmable valve is connected to the inlet of the fourth adsorption tower.

[0019] Furthermore, the second transmission unit includes a ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth programmable valves.

[0020] The first end of the ninth programmable valve is connected to the outlet of the first adsorption tower, the first end of the tenth programmable valve is connected to the outlet of the second adsorption tower, the second ends of the ninth and tenth programmable valves are simultaneously connected to the first end of the eleventh programmable valve, the second end of the eleventh programmable valve is connected to the first end of the twelfth programmable valve, and the second end of the twelfth programmable valve is connected to the inlet of the oxygen-enriched storage tank.

[0021] The first end of the thirteenth control valve is connected to the outlet of the third adsorption tower, the first end of the fourteenth control valve is connected to the outlet of the fourth adsorption tower, the second ends of the thirteenth and fourteenth control valves are simultaneously connected to the first end of the fifteenth control valve, the second end of the fifteenth control valve is connected to the first end of the sixteenth control valve, and the second end of the sixteenth control valve is connected to the inlet of the pure oxygen storage tank.

[0022] The first end of the twelfth programmable valve is connected to the first end of the sixteenth programmable valve.

[0023] Furthermore, the desorption unit includes a vacuum pump assembly and a secondary gas storage tank;

[0024] The first end of the vacuum pump unit is connected to the third transmission unit, and the second end of the vacuum pump unit is connected to the inlet of the auxiliary gas storage tank.

[0025] Furthermore, the third transmission unit includes the seventeenth programmable valve, the eighteenth programmable valve, the nineteenth programmable valve, and the twentieth programmable valve;

[0026] The first end of the seventeenth programmable valve is connected to the inlet of the first adsorption tower, the first end of the eighteenth programmable valve is connected to the inlet of the second adsorption tower, and the second ends of the seventeenth and eighteenth programmable valves are simultaneously connected to the inlet of the vacuum pump unit.

[0027] The first end of the nineteenth programmable valve is connected to the inlet of the third adsorption tower, the first end of the twentieth programmable valve is connected to the inlet of the fourth adsorption tower, and the second ends of the nineteenth and twentieth programmable valves are simultaneously connected to the inlet of the vacuum pump unit.

[0028] Furthermore, the oxygen generating device also includes a pressure equalization unit, which is simultaneously connected to the first adsorption tower, the second adsorption tower, the third adsorption tower, and the fourth adsorption tower.

[0029] Furthermore, the pressure equalization unit includes a twenty-first programmable valve, a twenty-second programmable valve, a twenty-third programmable valve, a twenty-fourth programmable valve, and a twenty-fifth programmable valve;

[0030] The first end of the twenty-first programmable valve is connected to the outlet of the first adsorption tower; the first end of the twenty-second programmable valve is connected to the outlet of the second adsorption tower; the first end of the twenty-third programmable valve is connected to the outlet of the third adsorption tower; the first end of the twenty-fourth programmable valve is connected to the outlet of the fourth adsorption tower; the second ends of the twenty-first and twenty-second programmable valves are simultaneously connected to the first end of the twenty-fifth programmable valve; and the second ends of the twenty-third and twenty-fourth programmable valves are simultaneously connected to the second end of the twenty-fifth programmable valve.

[0031] Furthermore, the oxygen generating unit also includes an oxygen analyzer, which is connected to the outlets of both the pure oxygen storage tank and the oxygen-enriched storage tank.

[0032] The four adsorption towers are designated as the first adsorption tower, the second adsorption tower, the third adsorption tower, and the fourth adsorption tower.

[0033] Molecular sieves are installed in the first, second, third, and fourth adsorption towers. The molecular sieves are used to adsorb water, carbon dioxide, and nitrogen.

[0034] According to the oxygen production device of this application, there are four adsorption towers. Two towers can be connected in parallel to produce oxygen-enriched oxygen and store the produced oxygen-enriched oxygen in an oxygen-enriched storage tank. Alternatively, two towers can be connected in series to produce pure oxygen and store the produced pure oxygen in an oxygen-enriched storage tank. The adsorption towers that do not participate in oxygen production can be desorbed during oxygen production, and the oxygen products of different purities do not interfere with each other.

[0035] When the oxygen generating unit produces oxygen-enriched air, the first transmission unit is used to transmit the compressed and filtered air to the two adsorption towers in the adsorption unit, the second transmission unit is used to transmit the oxygen enriched in the two adsorption towers to the oxygen-enriched storage tank, and the third transmission unit is used to transmit the auxiliary gas in the other two adsorption towers in the adsorption unit to the desorption unit.

[0036] When the oxygen generating unit produces pure oxygen, the first transmission unit is used to transmit the compressed and filtered air to the two adsorption towers in the adsorption unit. The second transmission unit is used to transmit the oxygen enriched in the latter adsorption tower to the pure oxygen storage tank. The third transmission unit is used to transmit the auxiliary gas in the other two adsorption towers in the adsorption unit to the desorption unit.

[0037] The beneficial effects of this invention are:

[0038] Compared with the prior art, the pressure swing adsorption oxygen generator with adjustable oxygen purity described in this invention has the following technical features or beneficial effects:

[0039] (1) Flexible switching of oxygen production conditions: The oxygen production device of the present invention can flexibly switch between pure oxygen and oxygen-enriched conditions to meet the needs of different application scenarios. Through precise programmable valve control and reasonable adsorption tower combination, the pure oxygen and oxygen-enriched conditions are not interfered with each other during production and storage, ensuring the stability of product quality.

[0040] (2) Improved molecular sieve efficiency and service life: Traditional pressure swing adsorption oxygen generators tend to reduce the efficiency of molecular sieves when producing low-purity oxygen, thus affecting their service life. However, this invention avoids damage to molecular sieves caused by long-term production of low-purity oxygen by optimizing the oxygen production process and programmable valve control, thereby improving the efficiency and service life of the molecular sieves.

[0041] (3) Energy saving and efficiency improvement and carbon dioxide emission reduction: This invention uses pure oxygen + flue gas (mainly CO2, containing a small amount of water vapor and excess oxygen) to replace nitrogen in the air. This not only replaces SCR / SNCR denitrification technology to achieve ultra-low emissions of nitrogen oxides from the cracking furnace, but also reduces the amount of flue gas emissions, reduces the heat loss of flue gas, and reduces the amount of fuel gas consumption, thus achieving multiple effects of energy saving and efficiency improvement and carbon dioxide emission reduction.

[0042] (4) Improved thermal efficiency and nitrogen oxide emission control: Existing heating furnaces can achieve nitrogen oxide emission concentrations of 20–50 mg / Nm³ without large-scale modifications. 3 It is flexible and adjustable, while improving thermal efficiency by 2% to 3% and reducing carbon dioxide emissions by 2.2% to 3.4%, which is of great significance for improving the energy efficiency and environmental performance of industrial furnaces and boilers.

[0043] (5) High degree of automation and easy operation: The oxygen generating device of the present invention has a high degree of automation. Through the precise control of the programmable valve, the oxygen generating process is automated and intelligent, reducing the difficulty of operation and labor costs.

[0044] (6) High product purity and recovery rate: By optimizing the combination of adsorption towers and the control strategy of programmable valves, this invention improves the purity and recovery rate of the product oxygen, making the oxygen production device perform better.

[0045] The oxygen generating device of the present invention has the beneficial effects of flexibly switching oxygen generating conditions, improving molecular sieve efficiency and service life, saving energy and increasing efficiency and reducing carbon dioxide emissions, improving thermal efficiency and controlling nitrogen oxide emissions, high degree of automation, and high product purity and recovery rate. It is of great significance for promoting energy conservation, carbon reduction and environmental upgrading of industrial furnaces and boilers. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0047] Figure 1 This is a schematic structural block diagram of an oxygen generating apparatus according to an embodiment of this application;

[0048] Figure 2 This is a schematic diagram of an oxygen generating device according to an embodiment of this application;

[0049] The attached diagram is labeled as follows: 1-Air compressor, 2-Air buffer tank, 3-Class C filter, 4-Refrigerated dryer, 5-Class T filter, 6-Class A filter, 7-First adsorption tower, 8-Second adsorption tower, 9-Third adsorption tower, 10-Fourth adsorption tower, 11-Pure oxygen storage tank, 12-Oxygen-enriched storage tank, 13-Vacuum pump unit, 14-Auxiliary gas storage tank.

[0050] 20-First programmable valve, 21-Fourth programmable valve, 22-Second programmable valve, 23-Third programmable valve, 24-Fifth programmable valve, 25-Sixth programmable valve;

[0051] 30-Ninth programmable valve, 31-Tenth programmable valve, 32-Seventh programmable valve, 33-Eighth programmable valve, 34-Thirteenth programmable valve, 35-Fourteenth programmable valve, 36-Fifteenth programmable valve, 37-Sixteenth programmable valve, 38-Eleventh programmable valve, 39-Twelfth programmable valve;

[0052] 40 - Twenty-first programmable valve, 41 - Twenty-second programmable valve, 42 - Twenty-fifth programmable valve, 43 - Twenty-third programmable valve, 44 - Twenty-fourth programmable valve;

[0053] 50-Filter-reducing-pressure rectifier A, 51-Filter-reducing-pressure rectifier B, 52-Filter-reducing-pressure rectifier C;

[0054] 60 - Flow meter A, 61 - Flow meter B, 62 - Flow meter C;

[0055] 70 - Seventeenth control valve, 71 - Eighteenth control valve, 72 - Nineteenth control valve, 73 - Twentieth control valve;

[0056] 80-Oxygen Analyzer;

[0057] 100 - Air compression and filtration unit, 200 - First transmission unit, 300 - Adsorption unit, 400 - Second transmission unit, 500 - Third transmission unit, 600 - Desorption unit, 700 - Pressure equalization unit. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The following description, in conjunction with the accompanying drawings... Figure 1-2 The pressure swing adsorption oxygen generator with adjustable oxygen purity is further described, and the technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with this application.

[0060] It should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this application to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals denote the same elements throughout.

[0061] It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or parts, these elements, components, areas, layers, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or part from another element, component, area, layer, or part. Therefore, without departing from the teachings of this application, the first element, component, area, layer, or part discussed below may be referred to as the second element, component, area, layer, or part.

[0062] Spatial relation terms such as "below," "under," "below," "under," "above," and "above" are used here for convenience to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of devices in use and operation.

[0063] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprise” and / or “comprising,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items. The term “connection” as used herein can mean a direct connection or an indirect connection.

[0064] Embodiments of the invention are described herein with reference to cross-sectional views that serve as schematic diagrams of preferred embodiments (and intermediate structures) of this application. Thus, variations in the shown shape are contemplated due to, for example, manufacturing techniques and / or tolerances. Therefore, embodiments of this application should not be limited to the specific shapes shown herein, but include shape deviations due to, for example, manufacturing processes. Consequently, the figures are substantially schematic, and their shapes are not intended to show the actual shape of the device and are not intended to limit the scope of this application.

[0065] See attached document Figure 1 , 2 An exemplary description is provided for an oxygen generating apparatus according to an embodiment of this application. This apparatus is used to selectively produce oxygen-enriched or pure oxygen. In this embodiment, pure oxygen is a gas with an oxygen content of 93% ± 2% (91%-95%), and oxygen-enriched oxygen is a gas with an oxygen content of 23%-55%. In other embodiments, the contents of pure oxygen and oxygen-enriched oxygen can be appropriately varied according to actual needs, with the oxygen content of pure oxygen being greater than that of oxygen-enriched oxygen.

[0066] The oxygen generating device includes an air compression and filtration unit 100, a first transmission unit 200, an adsorption unit 300, a second transmission unit 400, a pure oxygen storage tank 11, an oxygen-enriched storage tank 12, a third transmission unit 500, and a desorption unit 600.

[0067] The adsorption unit 300 includes four adsorption towers. The air compression filtration unit 100 is connected to the adsorption unit 300 through the first transmission unit 200, the pure oxygen storage tank 11 and the oxygen-enriched storage tank 12 are connected to the adsorption unit 300 through the second transmission unit 400, and the desorption unit 600 is connected to the adsorption unit 300 through the third transmission unit 500.

[0068] According to the oxygen production device of this application, there are four adsorption towers. Two towers can be connected in parallel to produce oxygen-enriched oxygen and store the produced oxygen-enriched oxygen in an oxygen-enriched storage tank. Alternatively, two towers can be connected in series to produce pure oxygen and store the produced pure oxygen in an oxygen-enriched storage tank. The adsorption towers that do not participate in oxygen production can be desorbed during oxygen production, and the oxygen products of different purities do not interfere with each other.

[0069] When the oxygen generator produces oxygen-enriched air, the first transmission unit 200 transmits the compressed and filtered air to two adsorption towers in the adsorption unit 300. These two adsorption towers adsorb water, carbon dioxide, and nitrogen from the air, but do not adsorb oxygen; the oxygen is enriched at the top of these two adsorption towers. The second transmission unit 400 transmits the oxygen enriched in these two adsorption towers to the oxygen-enriched storage tank 12. The third transmission unit 500 transmits the auxiliary gas from the other two adsorption towers in the adsorption unit 300 (i.e., the two adsorption towers that do not enrich oxygen) to the desorption unit 600 for desorption. The auxiliary gas is the gas adsorbed by the adsorption towers, which includes water, carbon dioxide, and nitrogen. It should be noted that the four adsorption towers in the adsorption unit can perform adsorption and desorption alternately in pairs. That is, two adsorption towers first adsorb, and the other two adsorption towers desorb. After a period of time, the two adsorption towers that previously desorbed adsorb, and the two adsorption towers that previously adsorbed desorb, and so on, alternating.

[0070] When the oxygen generator produces pure oxygen, the first transmission unit 200 is used to sequentially transmit the compressed and filtered air to the two adsorption towers in the adsorption unit 300. It should be noted that this sequential transmission of air to the two adsorption towers in the adsorption unit 300 means that the compressed and filtered air is first transmitted to one adsorption tower, and then the oxygen enriched in that tower is transmitted to the next adsorption tower for another adsorption. The second transmission unit 400 is used to transmit the oxygen enriched in the next adsorption tower to the pure oxygen storage tank 11. The third transmission unit 500 is used to transmit the byproduct gas from the other two adsorption towers in the adsorption unit 300 (i.e., the two adsorption towers that have not undergone oxygen enrichment) to the desorption unit 600. It should be noted that the four adsorption towers in the adsorption unit can perform adsorption and desorption alternately in pairs.

[0071] See appendix Figure 2 In this embodiment, the air compression filtration unit 100 is used to compress and filter air. The air compression filtration unit 100 includes an air compressor 1, an air buffer tank 2, a C-level filter 3 (C-level precision filter), a refrigerated dryer 4, a T-level filter 5 (T-level precision filter), and an A-level filter 6 (A-level precision filter) connected in sequence. The A-level filter is connected to the first transmission unit 200. The air buffer tank 2 is used to store and release compressed air to balance and stabilize pressure fluctuations in the system. The C-level filter 3, T-level filter 5, and A-level filter 6 are used to filter oil vapors, liquids, and solid particles in the compressed air. The refrigerated dryer is used to condense the gaseous moisture in the compressed air into liquid water and discharge the liquid water outside the machine through gas-water separation, thereby removing moisture from the air.

[0072] See appendix Figure 2 In this embodiment, the four adsorption towers are designated as a first adsorption tower 7, a second adsorption tower 8, a third adsorption tower 9, and a fourth adsorption tower 10. Each of these towers contains a molecular sieve. The molecular sieve adsorbs water, carbon dioxide, and nitrogen, but not oxygen. Therefore, oxygen can be concentrated at the top of the adsorption tower, i.e., at the outlet. This molecular sieve can be a zeolite molecular sieve. In some embodiments, the molecular sieve can also adsorb argon from the air.

[0073] See appendix Figure 2In this embodiment, the first transmission unit 200 includes a first programmable valve 20, a second programmable valve 22, a third programmable valve 23, a fourth programmable valve 21, a fifth programmable valve 24, a sixth programmable valve 25, a seventh programmable valve 32, and an eighth programmable valve 33. It should be noted that a programmable valve is a shut-off valve driven by pneumatic, hydraulic, or other means. This valve can be connected to a DCS (Distributed Control System) or a PLC (Programmable Logic Controller) to achieve remote control via a computer program.

[0074] The first end of the first programmable valve 20 is connected to the air compression and filtration unit 100. The second end of the first programmable valve 20 is simultaneously connected to the first ends of the second programmable valve 22 and the third programmable valve 23. The second ends of the second programmable valve 22 and the third programmable valve 23 are respectively connected to the inlet of the first adsorption tower 7 and the inlet of the second adsorption tower 8. The first end of the fourth programmable valve 21 is connected to the air compression and filtration unit 100. The second end of the fourth programmable valve 21 is simultaneously connected to the first ends of the fifth programmable valve 24 and the sixth programmable valve 25. The second ends of the fifth programmable valve 24 and the sixth programmable valve 25 are respectively connected to the inlet of the third adsorption tower 9 and the inlet of the fourth adsorption tower 10. The first end of the seventh programmable valve 32 is connected to the outlet of the first adsorption tower 7, and the second end of the seventh programmable valve 32 is connected to the inlet of the third adsorption tower 9. The first end of the eighth programmable valve 33 is connected to the outlet of the second adsorption tower 8, and the second end of the eighth programmable valve 33 is connected to the inlet of the fourth adsorption tower 10.

[0075] By controlling the opening and closing of the first programmable valve 20, the second programmable valve 22, the third programmable valve 23, the fourth programmable valve 21, the fifth programmable valve 24, the sixth programmable valve 25, the seventh programmable valve 32, and the eighth programmable valve 33, compressed air from the air compression and filtration unit 100 can be directed to pass through the first adsorption tower 7 and the second adsorption tower 8 (with the first programmable valve 20, the second programmable valve 22, and the third programmable valve 23 open), or through the third adsorption tower 9 and the fourth adsorption tower 10 (with the fourth programmable valve 21, the fifth programmable valve 24, and the sixth programmable valve 25 open), or through the first adsorption tower 7 and the third adsorption tower 9 sequentially (with the first programmable valve 20, the second programmable valve 22, and the seventh programmable valve 32 open), or through the second adsorption tower 8 and the fourth adsorption tower 10 sequentially (with the first programmable valve 20, the third programmable valve 23, and the eighth programmable valve 33 open). Specifically, the appropriate valve can be flexibly selected according to requirements.

[0076] See appendix Figure 2In this embodiment of the application, the second transmission unit 400 includes a ninth programmable valve 30, a tenth programmable valve 31, an eleventh programmable valve 38, a twelfth programmable valve 39, a thirteenth programmable valve 34, a fourteenth programmable valve 35, a fifteenth programmable valve 36, and a sixteenth programmable valve 37.

[0077] The first end of the ninth programmable valve 30 is connected to the outlet of the first adsorption tower 7, the first end of the tenth programmable valve 31 is connected to the outlet of the second adsorption tower 8, the second ends of the ninth programmable valve 30 and the second ends of the tenth programmable valve 31 are simultaneously connected to the first end of the eleventh programmable valve 38, the second end of the eleventh programmable valve 38 is connected to the first end of the twelfth programmable valve 39, and the second end of the twelfth programmable valve 39 is connected to the inlet of the oxygen-enriched storage tank 12.

[0078] The first end of the thirteenth control valve 34 is connected to the outlet of the third adsorption tower 9. The first end of the fourteenth control valve 35 is connected to the outlet of the fourth adsorption tower 10. The second ends of the thirteenth control valve 34 and the fourteenth control valve 35 are simultaneously connected to the first end of the fifteenth control valve 36. The second end of the fifteenth control valve 36 is connected to the first end of the sixteenth control valve 37. The second end of the sixteenth control valve 37 is connected to the inlet of the pure oxygen storage tank 11. The first end of the twelfth control valve 39 is connected to the first end of the sixteenth control valve 37.

[0079] By controlling the opening and closing of the ninth, tenth, eleventh, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth control valves, the enriched oxygen or pure oxygen in the adsorption tower can be transferred to the oxygen-enriched or pure oxygen storage tank. For example, when the oxygen enriched in the first adsorption tower 7 and the second adsorption tower 8 is oxygen-enriched, the ninth, tenth, eleventh, and twelfth control valves 30, 31, 38, and 39 can be opened to transfer the enriched oxygen to the oxygen-enriched storage tank 12. Similarly, when the oxygen enriched in the third adsorption tower is pure oxygen, the thirteenth, fifteenth, and sixteenth control valves 34, 36, and 37 can be opened to transfer the enriched pure oxygen to the pure oxygen storage tank 11.

[0080] See appendix Figure 2 In this embodiment, the desorption unit 600 is used to desorb the byproduct gas adsorbed by the adsorption tower. The desorption unit 600 includes a vacuum pump assembly 13 and a byproduct gas storage tank 14. The vacuum pump assembly 13 may include multiple vacuum pumps. A first end of the vacuum pump assembly 13 is connected to a third transmission unit 500, and a second end of the vacuum pump assembly 13 is connected to the inlet of the byproduct gas storage tank 14. The vacuum pump assembly 13 generates a negative pressure to desorb the byproduct gas from the molecular sieve in the adsorption tower, and then sequentially transmits it through the third transmission unit 500 and the vacuum pump assembly 13 to the byproduct gas storage tank 14 for storage. The byproduct gas is the gas adsorbed by the molecular sieve, which includes water, carbon dioxide, and nitrogen, etc.

[0081] See appendix Figure 2 In this embodiment of the application, the third transmission unit 500 includes a seventeenth programmable valve 70, an eighteenth programmable valve 71, a nineteenth programmable valve 72, and a twentieth programmable valve 73.

[0082] The first end of the seventeenth programmable valve 70 is connected to the inlet of the first adsorption tower 7, the first end of the eighteenth programmable valve 71 is connected to the inlet of the second adsorption tower 8, and the second ends of the seventeenth programmable valve 70 and the eighteenth programmable valve 71 are simultaneously connected to the inlet of the vacuum pump group 13.

[0083] The first end of the nineteenth programmable valve 72 is connected to the inlet of the third adsorption tower 9, the first end of the twentieth programmable valve 73 is connected to the inlet of the fourth adsorption tower 10, and the second end of the nineteenth programmable valve 72 and the second end of the twentieth programmable valve 73 are simultaneously connected to the inlet of the vacuum pump group 13.

[0084] By controlling the opening and closing of the seventeenth control valve 70, the eighteenth control valve 71, the nineteenth control valve 72, and the twentieth control valve 73, the adsorbed byproduct gas in the adsorption tower requiring desorption can be transferred to the desorption unit 600. For example, when the third adsorption tower 9 and the fourth adsorption tower 10 need desorption, the nineteenth control valve 72 and the twentieth control valve 73 can be opened. For example, when the second adsorption tower 8 and the fourth adsorption tower 10 need desorption, the eighteenth control valve 71 and the twentieth control valve 73 can be opened.

[0085] See appendix Figure 1 In this embodiment of the application, the oxygen generating device further includes a pressure equalization unit 700, which is connected to the first adsorption tower 7, the second adsorption tower 8, the third adsorption tower 9 and the fourth adsorption tower 10, and is used to equalize the pressure in the first adsorption tower 7, the second adsorption tower 8, the third adsorption tower 9 and the fourth adsorption tower 10, so as to better carry out the adsorption process.

[0086] See appendix Figure 2 In this embodiment of the application, the equalizing unit 700 includes a twenty-first programmable valve 40, a twenty-second programmable valve 41, a twenty-third programmable valve 43, a twenty-fourth programmable valve 44, and a twenty-fifth programmable valve 42.

[0087] The first end of the twenty-first programmable valve 40 is connected to the outlet of the first adsorption tower 7; the first end of the twenty-second programmable valve 41 is connected to the outlet of the second adsorption tower 8; the first end of the twenty-third programmable valve 43 is connected to the outlet of the third adsorption tower 9; the first end of the twenty-fourth programmable valve 44 is connected to the outlet of the fourth adsorption tower 10; the second ends of the twenty-first programmable valve 40 and the twenty-second programmable valve 41 are simultaneously connected to the first end of the twenty-fifth programmable valve 42; and the second ends of the twenty-third programmable valve 43 and the twenty-fourth programmable valve 44 are simultaneously connected to the second end of the twenty-fifth programmable valve 42.

[0088] By controlling the on / off states of the twenty-first programmable valve 40, the twenty-second programmable valve 41, the twenty-third programmable valve 43, the twenty-fourth programmable valve 44, and the twenty-fifth programmable valve 42, pressure equalization between any two or more adsorption towers can be achieved. In some embodiments, the twenty-fifth programmable valve 42 may not be provided in the pressure equalization unit 700.

[0089] See appendix Figure 2 In this embodiment of the application, the oxygen generating device also includes an oxygen analyzer 80, which is connected to the outlets of both the pure oxygen storage tank 11 and the oxygen-enriched storage tank 12, and is used to measure the oxygen content of the pure oxygen or oxygen-enriched oxygen output from the pure oxygen storage tank and the oxygen-enriched storage tank to ensure that it meets the application requirements.

[0090] See appendix Figure 2 In this embodiment, the outlet of the pure oxygen storage tank 11 is connected in sequence to a filter pressure reducing rectifier A50 and a flow meter A60, the outlet of the pure oxygen storage tank 11 is connected in sequence to a filter pressure reducing rectifier B51 and a flow meter B61, and the outlet of the auxiliary gas storage tank 14 is connected in sequence to a filter pressure reducing rectifier C52 and a flow meter C62.

[0091] The oxygen production device in this embodiment employs a four-tower process. For oxygen-enriched production, the first adsorption tower 7 and the second adsorption tower 8 perform adsorption, while the third adsorption tower 9 and the fourth adsorption tower 10 perform desorption and regeneration. For pure oxygen production, the first adsorption tower 7 and the third adsorption tower 9 are connected in series for two-stage adsorption, while the second adsorption tower 8 and the fourth adsorption tower 10 are connected in series for two-stage desorption and regeneration. It should be noted that all programmable valves in this embodiment are controlled by a PLC system, allowing for seamless switching between pure oxygen and oxygen-enriched production conditions, achieving continuous and stable production of oxygen of the required purity.

[0092] The working principle of oxygen-enriched production is as follows: Under the control of the PLC system, the first control valve 20, the second control valve 22, and the third control valve 23 are opened, allowing air to enter the first adsorption tower 7 and the second adsorption tower 8. The molecular sieves in the adsorption towers preferentially adsorb small amounts of water, carbon dioxide, nitrogen, and other impurities in the air. Oxygen is enriched at the top of the adsorption towers and output as the product oxygen-enriched gas (oxygen content 23%–55%). The product oxygen-enriched gas enters the oxygen-enriched storage tank 12 through the opened ninth control valve 30, tenth control valve 31, eleventh control valve 38, and twelfth control valve 39. During the adsorption in the first adsorption tower 7 and the second adsorption tower 8, the nineteenth control valve 72 and the twentieth control valve 73 are opened, and the vacuum pump group 13 is started. At this time, the third adsorption tower 9 and the fourth adsorption tower 10 enter the desorption and regeneration stage. The desorbed auxiliary gas enters the auxiliary gas storage tank 14 for storage through the nineteenth control valve 72, the twentieth control valve 73, and the vacuum pump group 13. After the third adsorption tower 9 and the fourth adsorption tower 10 complete desorption and regeneration, the twenty-first, twenty-second, twenty-third, twenty-third, twenty-fourth, and twenty-fifth programmable valves 40, 41, 43, 44, and 42 can be opened to equalize the pressure in the first, second, third, and fourth adsorption towers 7 and 8. After equalization, the fourth, fifth, and sixth programmable valves 21, 24, and 25 are opened, allowing oxygen enrichment to be produced in the third and fourth adsorption towers 9 and 10. The oxygen-enriched product (23%–55%) enters the oxygen-enriched storage tank 12 through the opening of the thirteenth, fourteenth, and fifteenth programmable valves 34, 35, 36, and 39. Then, the seventeenth and eighteenth programmable valves 70 and 71 are opened, allowing the first and second adsorption towers 7 and 8 to undergo desorption and regeneration. Under the control of the PLC, the two sets of adsorption towers work alternately to produce oxygen enrichment. Under this operating condition, two of the towers can be used to produce oxygen alternately, while the other two towers can be used to replace the oxygen-producing molecular sieves.

[0093] The working principle of pure oxygen production: Under the control of the PLC system, the first control valve 20, the second control valve 22, and the seventh control valve 32 are opened, allowing air to enter the first adsorption tower 7 to produce oxygen. The molecular sieve in the adsorption tower preferentially adsorbs small amounts of water, carbon dioxide, nitrogen, and other impurities in the air. Oxygen is enriched at the top of the adsorption tower and output as product oxygen. The product oxygen (oxygen content 23%–55%) enters the third adsorption tower 9 for purification via the seventh control valve 32. The purified product oxygen (oxygen content 93% ± 2%) enters the pure oxygen storage tank 11 via the opened thirteenth control valve 34, fifteenth control valve 36, and sixteenth control valve 37. During the operation of the first adsorption tower 7 and the third adsorption tower 9, the eighteenth control valve 71 and the nineteenth control valve 73 are opened. At this time, the second adsorption tower 8 and the fourth adsorption tower 10 enter the desorption and regeneration stage. The desorbed auxiliary gas enters the auxiliary gas storage tank 14 for storage via the eighteenth control valve 71, the nineteenth control valve 73, and the vacuum pump group 13. After the third adsorption tower 9 and the fourth adsorption tower 10 complete desorption and regeneration, the twenty-first, twenty-second, twenty-third, twenty-third, twenty-fourth, and twenty-fifth programmable valves 40, 41, 43, 44, and 42 can be opened to equalize the pressure in the first, second, third, and fourth adsorption towers 7 and 10. After equalization, the first, third, and eighth programmable valves 20, 23, and 33 are opened, allowing air to enter the second adsorption tower 8 to produce oxygen. The product oxygen (oxygen content 23%–55%) enters the fourth adsorption tower 10 through the eighth programmable valve 33 for purification. The purified product oxygen (93% ± 2%) enters the pure oxygen storage tank 11 through the fourteenth, fifteenth, and sixteenth programmable valves 35, 36, and 37. During this period, the seventeenth and nineteenth programmable valves 70 and 72 are opened, and the first and third adsorption towers 7 and 9 undergo desorption and regeneration. Under the control of the PLC, the two adsorption towers work alternately to produce pure oxygen. Under this operating condition, two of the towers can be connected in series to produce oxygen, while the other two towers can be used to replace the oxygen-producing molecular sieves.

[0094] For switching between oxygen-enriched and pure oxygen production conditions, regardless of which oxygen production condition the oxygen production device is in, it can switch to the other oxygen production condition after the first adsorption tower 7, the second adsorption tower 8, the third adsorption tower 9, and the fourth adsorption tower 10 are at equal pressure.

[0095] This invention is a technology that uses pure oxygen + flue gas (mainly CO2, containing a small amount of water vapor and excess oxygen), i.e., using circulating flue gas to replace nitrogen in the air, while still ensuring that the volume ratio of oxygen for combustion is 21%. It can not only replace SCR / SNCR denitrification technology to achieve ultra-low NOx emissions from pyrolysis furnaces, but also achieve multiple effects such as energy saving, efficiency improvement, and carbon dioxide emission reduction by reducing flue gas emissions, reducing flue gas heat loss, and reducing fuel gas consumption. Simultaneously, the existing radiant section, convection section, burner, and induced draft fan of the heating furnace do not need to be changed. It achieves a flexible and adjustable NOx emission concentration of 20–50 mg / Nm3, increases thermal efficiency by 2%–3%, and reduces carbon dioxide emissions by 2.2%–3.4%.

[0096] In summary, the oxygen generating device of this application can flexibly switch between pure oxygen and oxygen-enriched operating conditions. Under the corresponding operating conditions, it can continuously and stably output pure oxygen or oxygen-enriched oxygen. The oxygen products of different purities do not interfere with each other. It can also operate at room temperature, has a short start-up time, a high degree of automation, a small footprint, a simple process flow, and a high recovery rate. Furthermore, it can replace the oxygen generating molecular sieve without stopping production.

[0097] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.

[0098] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0099] Similarly, it should be understood that, in order to streamline this application and aid in understanding one or more of the various inventive aspects, features of this application may sometimes be grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of this application. However, this approach should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the corresponding claims, its inventive point lies in solving the corresponding technical problem with features fewer than all features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.

[0100] Those skilled in the art will understand that, apart from the mutual exclusion of features, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or elements of any method or apparatus so disclosed can be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature serving the same, equivalent, or similar purpose.

[0101] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0102] It should be noted that the above embodiments are illustrative of this application and not restrictive of this application, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims.

[0103] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pressure swing adsorption (PSA) oxygen generator with adjustable oxygen purity, characterized in that, It includes an air compression and filtration unit (100), a first transmission unit (200), an adsorption unit (300), a second transmission unit (400), a pure oxygen storage tank (11), an oxygen-enriched storage tank (12), a third transmission unit (500), and a desorption unit (600); The air compression filtration unit (100) is connected to the adsorption unit (300) through the first transmission unit (200), the pure oxygen storage tank (11) and the oxygen-enriched storage tank (12) are connected to the adsorption unit (300) through the second transmission unit (400), and the desorption unit (600) is connected to the adsorption unit (300) through the third transmission unit (500).

2. The pressure swing adsorption oxygen generator with adjustable oxygen purity as described in claim 1, characterized in that, The air compression and filtration unit (100) includes an air compressor (1), an air buffer tank (2), a C-level filter (3), a refrigerated dryer (4), a T-level filter (5), and an A-level filter (6) connected in sequence; the A-level filter (6) is connected to the first transmission unit (200).

3. The pressure swing adsorption oxygen generator with adjustable oxygen purity as described in claim 1, characterized in that, The first transmission unit (200) includes a first programmable valve (20), a second programmable valve (22), a third programmable valve (23), a fourth programmable valve (21), a fifth programmable valve (24), a sixth programmable valve (25), a seventh programmable valve (32), and an eighth programmable valve (33); The first end of the first programmable valve (20) is connected to the air compression and filtration unit (100), and the second end of the first programmable valve (20) is simultaneously connected to the first end of the second programmable valve (22) and the first end of the third programmable valve (23). The second end of the second programmable valve (22) and the second end of the third programmable valve (23) are respectively connected to the inlet of the first adsorption tower (7) and the inlet of the second adsorption tower (8). The first end of the fourth programmable valve (21) is connected to the air compression filter unit (100), and the second end of the fourth programmable valve (21) is simultaneously connected to the first end of the fifth programmable valve (24) and the first end of the sixth programmable valve (25). The second ends of the fifth programmable valve (24) and the sixth programmable valve (25) are respectively connected to the inlet of the third adsorption tower (9) and the inlet of the fourth adsorption tower (10). The first end of the seventh programmable valve (32) is connected to the outlet of the first adsorption tower (7), and the second end of the seventh programmable valve (32) is connected to the inlet of the third adsorption tower (9). The first end of the eighth programmable valve (33) is connected to the outlet of the second adsorption tower (8), and the second end of the eighth programmable valve (33) is connected to the inlet of the fourth adsorption tower (10).

4. The pressure swing adsorption oxygen generator with adjustable oxygen purity as described in claim 1, characterized in that, The second transmission unit (400) includes a ninth programmable valve (30), a tenth programmable valve (31), an eleventh programmable valve (38), a twelfth programmable valve (39), a thirteenth programmable valve (34), a fourteenth programmable valve (35), a fifteenth programmable valve (36), and a sixteenth programmable valve (37); The first end of the ninth programmable valve (30) is connected to the outlet of the first adsorption tower (7), the first end of the tenth programmable valve (31) is connected to the outlet of the second adsorption tower (8), the second ends of the ninth programmable valve (30) and the tenth programmable valve (31) are simultaneously connected to the first end of the eleventh programmable valve (38), the second end of the eleventh programmable valve (38) is connected to the first end of the twelfth programmable valve (39), and the second end of the twelfth programmable valve (39) is connected to the inlet of the oxygen-enriched storage tank (12). The first end of the thirteenth programmable valve (34) is connected to the outlet of the third adsorption tower (9), the first end of the fourteenth programmable valve (35) is connected to the outlet of the fourth adsorption tower (10), the second ends of the thirteenth programmable valve (34) and the second ends of the fourteenth programmable valve (35) are simultaneously connected to the first end of the fifteenth programmable valve (36), the second end of the fifteenth programmable valve (36) is connected to the first end of the sixteenth programmable valve (37), and the second end of the sixteenth programmable valve (37) is connected to the inlet of the pure oxygen storage tank (11). The first end of the twelfth programmable valve (39) is connected to the first end of the sixteenth programmable valve (37).

5. The pressure swing adsorption oxygen generator with adjustable oxygen purity as described in claim 1, characterized in that, The desorption unit (600) includes a vacuum pump assembly (13) and a secondary gas storage tank (14); The first end of the vacuum pump assembly (13) is connected to the third transmission unit (500), and the second end of the vacuum pump assembly (13) is connected to the inlet of the auxiliary gas storage tank (14).

6. The pressure swing adsorption oxygen generator with adjustable oxygen purity as described in claim 1, characterized in that, The third transmission unit (500) includes a seventeenth programmable valve (70), an eighteenth programmable valve (71), a nineteenth programmable valve (72), and a twentieth programmable valve (73); The first end of the seventeenth programmable valve (70) is connected to the inlet of the first adsorption tower (7), the first end of the eighteenth programmable valve (71) is connected to the inlet of the second adsorption tower (8), and the second ends of the seventeenth programmable valve (70) and the eighteenth programmable valve (71) are simultaneously connected to the inlet of the vacuum pump group (13). The first end of the nineteenth programmable valve (72) is connected to the inlet of the third adsorption tower (9), the first end of the twentieth programmable valve (73) is connected to the inlet of the fourth adsorption tower (10), and the second end of the nineteenth programmable valve (72) and the second end of the twentieth programmable valve (73) are simultaneously connected to the inlet of the vacuum pump group (13).

7. The pressure swing adsorption oxygen generator with adjustable oxygen purity as described in claim 1, characterized in that, It also includes a pressure equalization unit (700), which is connected to the first adsorption tower (7), the second adsorption tower (8), the third adsorption tower (9) and the fourth adsorption tower (10).

8. The pressure swing adsorption oxygen generator with adjustable oxygen purity as described in claim 7, characterized in that, The equalizing unit (700) includes a twenty-first programmable valve (40), a twenty-second programmable valve (41), a twenty-third programmable valve (43), a twenty-fourth programmable valve (44), and a twenty-fifth programmable valve (42); The first end of the 21st programmable valve (40) is connected to the outlet of the first adsorption tower (7), the first end of the 22nd programmable valve (41) is connected to the outlet of the second adsorption tower (8), the first end of the 23rd programmable valve (43) is connected to the outlet of the third adsorption tower (9), the first end of the 24th programmable valve (44) is connected to the outlet of the fourth adsorption tower (10), the second end of the 21st programmable valve (40) and the second end of the 22nd programmable valve (41) are simultaneously connected to the first end of the 25th programmable valve (42), and the second end of the 23rd programmable valve (43) and the second end of the 24th programmable valve (44) are simultaneously connected to the second end of the 25th programmable valve (42).

9. The pressure swing adsorption oxygen generator with adjustable oxygen purity as described in claim 1, characterized in that, It also includes an oxygen analyzer (80), which is connected to the outlets of both the pure oxygen storage tank (11) and the oxygen-enriched storage tank (12).

10. The pressure swing adsorption oxygen generator with adjustable oxygen purity as described in any one of claims 1-9, characterized in that, The four adsorption towers are the first adsorption tower (7), the second adsorption tower (8), the third adsorption tower (9), and the fourth adsorption tower (10); The first adsorption tower (7), the second adsorption tower (8), the third adsorption tower (9) and the fourth adsorption tower (10) are all equipped with molecular sieves for adsorbing water, carbon dioxide and nitrogen. Two towers are connected in parallel to produce oxygen-enriched oxygen and the produced oxygen-enriched oxygen is stored in an oxygen-enriched storage tank (12), or two towers are connected in series to produce pure oxygen and the produced pure oxygen is stored in an oxygen-enriched storage tank (12). When the oxygen generating device produces oxygen-enriched air, the first transmission unit (200) transmits the compressed and filtered air to the two adsorption towers in the adsorption unit (300), the second transmission unit (400) transmits the oxygen enriched in the two adsorption towers to the oxygen-enriched storage tank (12), and the third transmission unit (500) transmits the auxiliary gas in the other two adsorption towers in the adsorption unit (300) to the desorption unit (600). When the oxygen generating device produces pure oxygen, the first transmission unit (200) transmits the compressed and filtered air to the two adsorption towers in the adsorption unit (300) in turn. The second transmission unit (400) transmits the oxygen enriched in the second adsorption tower to the pure oxygen storage tank (11). The third transmission unit (500) transmits the auxiliary gas in the other two adsorption towers in the adsorption unit (300) to the desorption unit (600).

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