Vacuum pressure swing adsorption oxygen generation system with coupling current equalization

Abstract

The utility model discloses a vacuum pressure swing adsorption oxygen generating system with coupling current equalization, which comprises: air filter, air blower, cooler and separation unit arranged in sequence along the airflow direction on the air inlet pipeline; the input and output positions of the separation unit are further provided with a mixing module for adjusting the oxygen output concentration; wherein, the mixing module is configured as a first mixing module or a second mixing module; the input end of the first mixing module is communicated between the air filter and the air blower, and the output end of the first mixing module is communicated with the output end of the separation unit. Advantageous effects: the system realizes the precise fine adjustment of the output concentration through the synergistic control of the magnetic suspension small air blower, the mixed gas pipe and the intelligent control valve, and the dynamic adjustment of the mixed gas proportion in combination with the real-time oxygen concentration detection.

Description

Technical Field

[0001] This utility model relates to the field of gas separation technology, and in particular to a vacuum pressure swing adsorption oxygen generation system with coupled flow equalization. Background Technology

[0002] Vacuum pressure swing adsorption (VPSA) oxygen generation technology is an energy-saving process widely used in industrial oxygen enrichment. It achieves oxygen separation and enrichment through the selective adsorption and desorption of nitrogen in the air by an adsorbent under different pressures. A traditional VPSA oxygen generation system typically consists of a blower, adsorption tower, vacuum pump, buffer tank, and control system. It produces oxygen-enriched gas through a periodic process of pressure adsorption and vacuum desorption.

[0003] In practical operation, traditional VPSA systems typically employ a "concentration cut-off method" to achieve higher oxygen concentrations (e.g., 85%), resulting in significant fluctuations in oxygen concentration before the buffer tank between 83% and 93%. While the final average output oxygen concentration may reach the target value, this volatility is insufficient in many oxygen-enriched application scenarios. For example, in some industrial processes, users require oxygen concentrations of only 40% or lower, but demand extremely high concentration stability, which traditional systems cannot meet due to their fluctuating output. Furthermore, traditional VPSA systems consume a lot of energy when pursuing high oxygen concentrations, with typical electricity consumption of approximately 0.31 kWh / m³. Despite their technological maturity, there is still considerable room for improvement in energy efficiency and output stability. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to solve the problems in the prior art and provide a vacuum pressure swing adsorption oxygen generation system with coupled flow equalization.

[0005] Technical solution: A vacuum pressure swing adsorption oxygen generation system with coupled current equalization is proposed, comprising: An air filter, blower, cooler, and separator are arranged sequentially along the airflow direction on the air intake duct. The separation unit is also equipped with a mixing module at its input and output positions to adjust the oxygen output concentration; The hybrid module is configured as either a first hybrid module or a second hybrid module. The input of the first mixing module is connected between the air filter and the blower, and the output of the first mixing module is connected to the output of the separation unit; The input of the second mixing module is connected between the blower and the cooler, and between the cooler and the separation unit, and the output of the second mixing module is connected to the output of the separation unit.

[0006] Preferably, the first mixing module includes a first mixing tube, the input end of which is connected between the air filter and the blower; The output of the first mixing tube is connected to the output of the separation unit.

[0007] Preferably, a magnetic levitation fan and a first intelligent control valve are sequentially connected to the first mixing pipe.

[0008] Preferably, the second mixing module includes a second mixing tube and a third mixing tube. The input end of the second mixing tube is connected to the output end of the blower, and the output end of the second mixing tube is connected to the output end of the separation unit. One end of the third mixing tube is connected to the second mixing tube, and the other end of the third mixing tube is connected to the input end of the separation unit.

[0009] Preferably, the input and output ends of the second mixing tube are respectively connected to a second intelligent control valve and a fourth intelligent control valve; A third intelligent control valve is connected to the third mixing pipe.

[0010] Preferably, the output end of the separation unit is connected to an oxygen-enriching pipeline and a desorption pipeline, respectively.

[0011] Preferably, the oxygen-enriched pipeline includes any one or more of a gas flow meter, a pressure meter, and a concentration meter, as well as an oxygen-enriched buffer tank. The input end of the oxygen-enriched buffer tank is connected to the output end of the separation unit, and the output end of the oxygen-enriched buffer tank is connected to any one or more of the gas flow detector, pressure detector, and concentration detector.

[0012] Preferably, the desorption pipeline includes a vacuum pump and a nitrogen exhaust silencer; The input end of the vacuum pump is connected to the output end of the separation unit, and the output end of the vacuum pump is connected to the nitrogen exhaust silencer.

[0013] Preferably, it also includes an automatic control device, wherein the first intelligent control valve, the second intelligent control valve, the third intelligent control valve, and the fourth intelligent control valve are electrically connected to the automatic control device; The gas flow meter, pressure meter, and concentration meter can all be electrically connected to the automatic control equipment. Beneficial effects

[0014] The system utilizes the coordinated control of a magnetically levitated miniature fan, a mixing pipe, and an intelligent control valve, combined with real-time oxygen concentration detection, to dynamically adjust the mixed gas ratio, achieving precise fine-tuning of the output concentration. This completely avoids the significant fluctuations in oxygen concentration (e.g., 83%~93%) caused by traditional "concentration cut-off methods," and can stably control the oxygen concentration within the set value range of ±1.5%~±2%, making it particularly suitable for industrial applications with stringent requirements for oxygen concentration stability.

[0015] By optimizing the hybrid module structure and control strategy, the system's power consumption when producing 80% oxygen is only 0.245~0.250 kWh / m³, which is significantly higher than the 0.31 kWh / m³ of the traditional VPSA system, achieving energy-saving operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the first hybrid module structure in this practical application.

[0017] Figure 2 This is a schematic diagram of the structure of the second hybrid module of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the automatic control equipment of this utility model.

[0019] Figure label: 1. Air filter; 2. Blower; 3. Cooler; 4. Separation unit; 5. Vacuum pump; 6. Oxygen-enriched buffer tank; 7. Magnetic levitation fan; 8. First intelligent control valve; 9. Nitrogen exhaust silencer; 10. First mixing pipe; 11. Second mixing pipe; 12. Sector plate; 13. Gas flow meter; 14. Pressure meter; 15. Concentration meter; 16. Automatic control equipment; 17. Third intelligent control valve; 18. Fourth intelligent control valve; 19. Second intelligent control valve; 20. Actuator. Detailed Implementation

[0020] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0021] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects.

[0023] In response to the problems existing in the current technology, combined with Figure 1-3 A vacuum pressure swing adsorption oxygen generation system with coupled current equalization, comprising: An air filter 1, a blower 2, a cooler 3, and a separation unit 4 are arranged sequentially along the airflow direction on the air intake duct; The input and output positions of the separation unit 4 are also equipped with a mixing module for adjusting the oxygen output concentration; The hybrid module is configured as either a first hybrid module or a second hybrid module. The input of the first mixing module is connected between the air filter 1 and the blower 2, and the output of the first mixing module is connected to the output of the separation unit 4. The input of the second mixing module is connected between the blower 2 and the cooler 3, and between the cooler 3 and the separation unit 4. The output of the second mixing module is connected to the output of the separation unit 4.

[0024] In some specific embodiments, the output end of the separation unit 4 is connected to an oxygen-enriching pipeline and a desorption pipeline, respectively.

[0025] In some specific embodiments, the oxygen-enriched pipeline includes any one or more of a gas flow meter 13, a pressure meter 14, and a concentration meter 15, as well as an oxygen-enriched buffer tank 6. The input end of the oxygen-enriched buffer tank 6 is connected to the output end of the separation unit 4, and the output end of the oxygen-enriched buffer tank 6 is connected to any one or more of the gas flow detector 13, pressure detector 14, and concentration detector 15.

[0026] In some specific embodiments, the desorption pipeline includes a vacuum pump 5 and a nitrogen exhaust silencer 9; The input end of the vacuum pump 5 is connected to the output end of the separation unit 4, and the output end of the vacuum pump 5 is connected to the nitrogen exhaust silencer.

[0027] Specifically, during operation, air is filtered through the air filter 1 via the intake pipe to remove impurities. Then, it is pressurized by the blower 2 and cooled by the cooler 3 before being fed into the separation unit 4. In the separation unit 4, vacuum pressure swing adsorption is performed, and nitrogen is adsorbed to obtain oxygen with a concentration of 90%. After entering the oxygen-enriched buffer tank through the oxygen-enriched pipeline, the oxygen is discharged. The adsorbed gas is absorbed by the vacuum pump 5 and then discharged through the nitrogen exhaust silencer. Finally, the oxygen concentration at the output is adjusted by the first mixing module and the second mixing module.

[0028] In some specific embodiments, the separation unit 4 is selected from the existing radial three-tower oxygen generator. The separation unit 4 with this structure can ensure that the blower 2 and vacuum pump 5 can work continuously, while making full use of the pressure energy (automatic exhaust) and vacuum energy (automatic intake) in the radial adsorption tower. At the same time, the dead space is small after the device is arranged, the gas distribution is uniform, the molecular sieve adsorption is uniform, and the utilization rate is high.

[0029] In some specific embodiments, the blower 2 and the vacuum pump 5 adopt ultra-high efficiency centrifuges, and the device has advantages such as low noise, high equipment efficiency, low system energy consumption, and more convenient load adjustment.

[0030] In some specific embodiments, the separation unit 4 is a radial three-tower oxygen generator.

[0031] In some specific embodiments, the first mixing module includes a first mixing pipe 10, the input end of which is connected between the air filter 1 and the blower 2; The output end of the first mixing tube 10 is connected to the output end of the separation unit 4.

[0032] In some specific embodiments, a magnetic levitation fan 7 and a first intelligent control valve 8 are sequentially connected to the first mixing pipe 10.

[0033] In the first mixing module, a portion of the air flows into the first mixing pipe and is pressurized by the magnetic levitation fan 7 to obtain approximately 10 kPa of raw air. This raw air is then mixed with the oxygen-enriched gas produced by the separation unit. This process reduces the oxygen concentration when it is too high and dynamically adjusts the amount of gas mixed to stabilize the oxygen concentration when it fluctuates significantly. In this example, when producing oxygen-enriched gas with an oxygen concentration of 80%, the power consumption is approximately 0.245 kWh / m³, which significantly improves energy efficiency compared to traditional vacuum pressure swing adsorption systems, and the oxygen concentration can be stably maintained within the range of 80% ± 1.5%.

[0034] In some specific embodiments, the second mixing module includes a second mixing tube 11 and a third mixing tube. The input end of the second mixing tube 11 is connected to the output end of the blower 2, and the output end of the second mixing tube 11 is connected to the output end of the separation unit 4. One end of the third mixing tube is connected to the second mixing tube 11, and the other end of the third mixing tube is connected to the output end of the separation unit 4.

[0035] In some specific embodiments, the input and output ends of the second mixing tube 11 are respectively connected to a second intelligent control valve 19 and a fourth intelligent control valve 18; The third mixing pipe 12 is connected to a third intelligent control valve 17.

[0036] In the second mixing module, the third intelligent control valve 17 is opened. Under normal conditions, the second intelligent control valve 19 remains closed. The raw material air, after being pressurized by the blower 2 and cooled by the cooler 3, is introduced into the main mixing pipe through the third mixing pipe. The subsequent steps are the same as in Example 1.

[0037] When the oxygen concentration is detected to be too low, the amount of mixed gas introduced can be reduced, or the mixing ratio can be adjusted.

[0038] When fine-tuning of the temperature and concentration of the mixed gas is required, the second intelligent control valve 19 can be opened to input uncooled gas. Both streams of air are simultaneously introduced into the main mixing pipe for subsequent coupling and flow equalization processes. In this example, when producing gas with an oxygen concentration of 80%, the power consumption is approximately 0.250 kWh / m³, and the oxygen concentration can be stably maintained within the range of 80% ± 2%.

[0039] By using the above-mentioned coupling and flow equalization method, the system can effectively reduce energy consumption while maintaining a stable output oxygen concentration, avoiding the efficiency loss and concentration fluctuations caused by frequent switching of adsorption towers or the use of the "concentration cut-off method" in traditional systems.

[0040] In some specific embodiments, an automatic control device 16 is also included, wherein the first intelligent control valve 8, the second intelligent control valve 19, the third intelligent control valve 17, and the fourth intelligent control valve 18 are electrically connected to the automatic control device 16 respectively; The gas flow detector 13, pressure detector 14, and concentration detector 15 are all electrically connected to the automatic control device 16. The device also includes a sensor 21, which includes the gas flow detector 13 (i.e., gas flow sensor), the pressure detector 14 (i.e., pressure sensor), and the concentration detector 15 (i.e., oxygen concentration sensor). The automatic control device 16 is connected to the sensors and is used to adjust the opening of the first intelligent control valve 8, the second intelligent control valve 19, the third intelligent control valve 17, and the fourth intelligent control valve 18 in real time according to the output oxygen concentration.

[0041] In some specific embodiments, the automatic control device 16 is a DDC or PLC controller.

[0042] In some specific embodiments, an actuator 20 is also included, which includes the first intelligent control valve 8, the second intelligent control valve 19, the third intelligent control valve 17, and the fourth intelligent control valve 18.

[0043] Specifically, when the concentration detector 15 detects that the gas concentration is too high, it can adjust the closure of the first intelligent control valve 8, the second intelligent control valve 19, the third intelligent control valve 17, and the fourth intelligent control valve 18 through a preset program to stabilize the oxygen output concentration. The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A vacuum pressure swing adsorption oxygen generation system with coupled current equalization, characterized in that, include: An air filter (1), a blower (2), a cooler (3), and a separation unit (4) are arranged sequentially along the airflow direction on the air intake duct. The separation unit (4) is also equipped with a mixing module at its input and output positions for adjusting the oxygen output concentration; The hybrid module is configured as either a first hybrid module or a second hybrid module. The input end of the first mixing module is connected between the air filter (1) and the blower (2), and the output end of the first mixing module is connected to the output end of the separation unit (4); The input end of the second mixing module is connected between the blower (2) and the cooler (3) and between the cooler (3) and the separation unit (4), and the output end of the second mixing module is connected to the output end of the separation unit (4).

2. The vacuum pressure swing adsorption oxygen generation system with coupled current equalization according to claim 1, characterized in that, The first mixing module includes a first mixing tube (10), the input end of which is connected between the air filter (1) and the blower (2); The output end of the first mixing tube (10) is connected to the output end of the separation unit (4).

3. The vacuum pressure swing adsorption oxygen generation system with coupled current equalization according to claim 2, characterized in that, A magnetic levitation fan (7) and a first intelligent control valve (8) are sequentially connected to the first mixing pipe (10).

4. The vacuum pressure swing adsorption oxygen generation system with coupled current equalization according to claim 3, characterized in that, The second mixing module includes a second mixing tube (11) and a third mixing tube (12). The input end of the second mixing tube (11) is connected to the output end of the blower (2), and the output end of the second mixing tube (11) is connected to the output end of the separation unit (4). One end of the third mixing tube (12) is connected to the second mixing tube (11), and the other end of the third mixing tube (12) is connected to the input end of the separation unit (4).

5. A vacuum pressure swing adsorption oxygen generation system with coupled current equalization according to claim 4, characterized in that, The input and output ends of the second mixing tube (11) are respectively connected to a second intelligent control valve (19) and a fourth intelligent control valve (18). The third mixing pipe (12) is connected to a third intelligent control valve (17).

6. A vacuum pressure swing adsorption oxygen generation system with coupled current equalization according to claim 5, characterized in that, The output end of the separation unit (4) is connected to an oxygen-enriched pipeline and a desorption pipeline, respectively.

7. A vacuum pressure swing adsorption oxygen generation system with coupled current equalization according to claim 6, characterized in that, The oxygen-enriched pipeline includes any one or more of a gas flow meter (13), a pressure meter (14), and a concentration meter (15), as well as an oxygen-enriched buffer tank (6). The input end of the oxygen-enriched buffer tank (6) is connected to the output end of the separation unit (4), and the output end of the oxygen-enriched buffer tank (6) is connected to any one or more of the gas flow detector (13), pressure detector (14), and concentration detector (15).

8. A vacuum pressure swing adsorption oxygen generation system with coupled current equalization according to claim 7, characterized in that, The desorption pipeline includes a vacuum pump (5) and a nitrogen exhaust silencer (9); The input end of the vacuum pump (5) is connected to the output end of the separation unit (4), and the output end of the vacuum pump (5) is connected to the nitrogen exhaust silencer (9).

9. A vacuum pressure swing adsorption oxygen generation system with coupled current equalization according to claim 7, characterized in that, It also includes an automatic control device (16), wherein the first intelligent control valve (8), the second intelligent control valve (19), the third intelligent control valve (17), and the fourth intelligent control valve (18) are electrically connected to the automatic control device (16) respectively; The gas flow meter (13), pressure meter (14) and concentration meter (15) can all be electrically connected to the automatic control device (16).

10. A vacuum pressure swing adsorption oxygen generation system with coupled current equalization according to claim 9, characterized in that, The automatic control device (16) is a DDC or PLC controller.

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