Pressure swing adsorption system

Abstract

The utility model relates to the field of gas separation, in particular to a pressure swing adsorption system which comprises a gas distribution unit, an adsorption tower, a light component reflux unit, a heavy component reflux unit and a gas analyzer. Light-component product gas and heavy-component product gas are respectively produced from gas raw materials of multiple components through the adsorption tower, the product gas can flow back to the adsorption tower through the corresponding product gas buffer tank, the piston pump, the backflow buffer tank and the mass flow meter, and the pressure of the gas pumped into the backflow buffer tank can be accurately regulated and controlled by regulating and controlling the corresponding piston pump. The reflux ratio of the product gas is accurately controlled; meanwhile, a plurality of mass flow controllers are connected to the feeding end of the adsorption tower, so that the flow of the adsorption tower can be conveniently calculated and compared with the flow of the discharging end of the adsorption tower to judge whether the materials of the system are conserved or not, and gas raw materials with different contents can be conveniently adjusted to explore the separation effect of the pressure swing adsorption experiment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas separation, and specifically relates to a pressure swing adsorption system. BACKGROUND

[0002] The pressure swing adsorption technology is to realize the enrichment and purification of gas by using the difference of adsorption capacity of adsorbents to each component of mixed gas under different pressures. In the prior art, when the product gas reflux operation is carried out by the pressure swing adsorption device, the flow rate of the product gas reflux cannot be accurately and stably controlled, the overall operability of the pressure swing adsorption device is low, and only some simple pressure swing adsorption process cycles can be realized, resulting in poor actual separation effect of gas. SUMMARY

[0003] The present application provides a pressure swing adsorption system, which can accurately control the reflux flow rate of product gas, and is beneficial to conveniently explore the separation effect of gas raw materials with different components.

[0004] The utility model provides following technical scheme: a pressure swing adsorption system, include: gas distribution unit, adsorption tower, light component reflux unit, heavy component reflux unit and gas analyzer,

[0005] The gas distribution unit includes a plurality of pure component gas cylinders, a plurality of mass flow controllers and a gas mixing tank, each mass flow controller is connected to the outlet of the pure component gas cylinder one by one, each mass flow controller is connected to the inlet of the gas mixing tank, the number of the adsorption towers is two, one end of each adsorption tower is provided with a first pipeline, and the other end is provided with a second pipeline, and the outlet of the gas mixing tank is communicated with the adsorption tower through the first pipeline.

[0006] The light component reflux unit includes a light component product gas buffer tank, a first piston pump, a light component reflux buffer tank, a first mass flow meter and a second mass flow meter, the inlet of the light component product gas buffer tank is communicated with the adsorption tower through the second pipeline, the light component product gas buffer tank is provided with a first outlet and a second outlet, the first mass flow meter and the gas analyzer are connected to the first outlet in sequence, the second mass flow meter, the light component reflux buffer tank, the first piston pump, the second outlet are connected in sequence, and the outlet of the second mass flow meter is connected to the second pipeline.

[0007] The heavy component reflux unit includes a vacuum pump, a heavy component product gas buffer tank, a second piston pump, a heavy component reflux buffer tank, a third mass flow meter, and a fourth mass flow meter. The inlet of the vacuum pump is connected to the adsorption tower, the inlet of the heavy component product gas buffer tank is connected to the outlet of the vacuum pump, the heavy component product gas buffer tank has a third outlet and a fourth outlet, the third mass flow meter and the gas analyzer are connected in sequence to the third outlet, the fourth mass flow meter, the heavy component reflux buffer tank, the second piston pump, and the fourth outlet are connected in series, and the outlet of the fourth mass flow meter is connected to the first pipeline.

[0008] Preferably, the adsorption tower is cylindrical, with an internal diameter of 10-100 mm and a height of 20-1500 mm, and the ratio of the height to the internal diameter is 2 / 1-50 / 1.

[0009] Preferably, the gas distribution unit further includes a raw gas buffer tank and a fifth mass flow meter, wherein the raw gas buffer tank and the fifth mass flow meter are sequentially connected to the outlet of the mixing tank, and the outlet of the fifth mass flow meter is connected to the first pipeline.

[0010] Preferably, the volume ratio of the light component product gas buffer tank, the light component reflux buffer tank, the heavy component product gas buffer tank, the heavy component reflux buffer tank, and the raw material gas buffer tank to the adsorption tower is 1 / 1 to 15 / 1.

[0011] Preferably, the internal diameter of the first pipe and the second pipe is 3-10 mm.

[0012] Preferably, the pressure swing adsorption system further includes a heating device for heating the outer wall of the adsorption tower.

[0013] Preferably, the first pipeline is provided with a first pneumatic valve, which is used to connect the outlet of the gas distribution unit to the inlet of the adsorption tower; the second pipeline is provided with a second pneumatic valve and a third pipeline, the second pneumatic valve is used to connect the outlet of the adsorption tower to the inlet of the light component product gas buffer tank, the second pipelines of the two adsorption towers are connected through the third pipeline, and the third pipeline is located between the adsorption tower and the second pneumatic valve, and the third pipeline is provided with a third pneumatic valve;

[0014] The outlet of the second mass flow meter is provided with a fourth pneumatic valve, which is connected to the second pipeline; the inlet of the vacuum pump is provided with a fifth pneumatic valve, which is connected to the adsorption tower through the fifth pneumatic valve; the outlet of the fourth mass flow meter is provided with a sixth pneumatic valve, which is connected to the first pipeline.

[0015] Preferably, the pressure swing adsorption system further includes an automatic control device, which is electrically connected to the first pneumatic valve, the second pneumatic valve, the third pneumatic valve, the fourth pneumatic valve, the fifth pneumatic valve and the sixth pneumatic valve respectively.

[0016] Preferably, the gas distribution unit further includes multiple one-way valves, each of which is connected to the outlet of the mass flow controller and to the inlet of the mixing tank.

[0017] Preferably, the mixing tank is provided with metal baffles inside.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] Multiple component gas feedstocks pass through an adsorption tower to produce light component product gas and heavy component product gas, respectively. The light component product gas and heavy component product gas are then returned to the adsorption tower via corresponding product gas buffer tanks, piston pumps, reflux buffer tanks, and mass flow meters. The mass flow meter connected to the adsorption tower at the corresponding observation outlet can monitor the gas flow rate of the reflux product gas in real time. By connecting the mass flow meter connected to the product gas buffer tank to a gas analyzer, the reflux ratio can be calculated. This allows for precise control of the gas pressure pumped into the reflux buffer tank by adjusting the corresponding piston pump, thus achieving precise control of the product gas reflux ratio. At the same time, multiple mass flow controllers are connected to the feed end of the adsorption tower to facilitate calculation and comparison with the flow rate at the output end of the adsorption tower, and to allow for the adjustment of different gas feedstock contents to explore the separation effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the pressure swing adsorption system of this utility model.

[0021] In the picture:

[0022] 1. Gas distribution unit; 11. Pure component gas cylinder; 12. Mass flow controller; 13. Mixing tank; 14. Raw material gas buffer tank; 15. Fifth mass flow meter; 16. Check valve; 2. Adsorption tower; 21. First pipeline; 211. First pneumatic valve; 22. Second pipeline; 221. Second pneumatic valve; 222. Third pipeline; 2221. Third pneumatic valve; 3. Light component reflux unit; 31. Light component product gas buffer tank; 311. First outlet; 312. Second outlet; 32. First piston pump; 33. Light component reflux buffer tank; 34. First mass flow meter; 35. Second mass flow meter; 36. Fourth pneumatic valve; 4. Heavy component reflux unit; 41. Vacuum pump; 42. Heavy component product gas buffer tank; 421. Third outlet; 422. Fourth outlet; 43. Second piston pump; 44. Heavy component reflux buffer tank; 45. Third mass flow meter; 46. Fourth mass flow meter; 47. Fifth pneumatic valve; 48. Sixth pneumatic valve; 5. Heating device. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0026] Combination Figure 1As shown, a pressure swing adsorption (PSA) system includes: a gas distribution unit 1, an adsorption tower 2, a light component reflux unit 3, a heavy component reflux unit 4, and a gas analyzer (not specifically shown in the figure); the gas distribution unit 1 includes multiple pure component gas cylinders 11, multiple mass flow controllers 12, and a mixing tank 13. Each mass flow controller 12 is connected to the outlet of one of the pure component gas cylinders 11, and each mass flow controller 12 is connected to the inlet of the same mixing tank 13. There are two adsorption towers 2. One end of the tower 2 is provided with a first pipeline 21, and the other end is provided with a second pipeline 22. The outlet of the mixing tank 13 is connected to the adsorption tower 2 through the first pipeline 21. The light component reflux unit 3 includes a light component product gas buffer tank 31, a first piston pump 32, a light component reflux buffer tank 33, a first mass flow meter 34, and a second mass flow meter 35. The inlet of the light component product gas buffer tank 31 is connected to the adsorption tower 2 through the second pipeline 22. The light component product gas buffer tank 31 is provided with a first outlet 311 and a second outlet 312. The first mass flow meter 34 and the gas analyzer are sequentially connected to the first outlet 311. The second mass flow meter 35, the light component reflux buffer tank 33, the first piston pump 32, and the second outlet 312 are connected in series. The outlet of the second mass flow meter 35 is connected to the second pipeline 22. The heavy component reflux unit 4 includes a vacuum pump 41, a heavy component product gas buffer tank 42, a second piston pump 43, a heavy component reflux buffer tank 44, a third mass flow meter 45, and a fourth mass flow meter 46. The inlet of 41 is connected to the adsorption tower 2. The inlet of the heavy component product gas buffer tank 42 is connected to the outlet of the vacuum pump 41. The heavy component product gas buffer tank 42 is provided with a third outlet 421 and a fourth outlet 422. The third mass flow meter 45 and the gas analyzer are connected in sequence to the third outlet 421. The fourth mass flow meter 46, the heavy component reflux buffer tank 44, the second piston pump 43 and the fourth outlet 422 are connected in series. The outlet of the fourth mass flow meter 46 is connected to the first pipeline 21.

[0027] The gases in multiple pure component gas cylinders 11 include combinations of at least two of CO2, N2, C2, C3, C4, C5, CH4, O2, Ne, He, and H2. By setting the flow rate value of the mass flow controller 12, the content of the mixed gas flowing into the mixing tank 13 can be controlled, allowing for real-time acquisition of mixed gases with specific components to simulate gas sources with different components. The raw material gas supplied by the gas distribution unit 1 enters the adsorption tower 2, where the heavy component product gas is adsorbed by the adsorbent, and the light component product gas flows out from the top of the adsorption tower 2. The light component product gas can be transported to the outside via the light component product gas buffer tank 31 and the first mass flow meter 34. Introducing the light component product gas from the outlet of the first mass flow meter 34 into a gas analyzer can detect the content of each component. The light component product gas can also be returned to the adsorption tower 2 via the light component product gas buffer tank 31, the first piston pump 32, the light component reflux buffer tank 33, and the second mass flow meter 35, which can be used to purge or pressurize the adsorption tower 2. The presence of the light component product gas buffer tank 31 ensures thorough mixing of the gas within the adsorption tower 2. Furthermore, the storage of a certain amount of light component product gas in the buffer tank 31 guarantees that the product gas pressure remains positive when the first piston pump 32 draws in gas, preventing external gas from flowing back into the equipment. By adjusting the driving gas pressure of the first piston pump 32 and the piston pump boosting pressure control knob, the gas pressure pumped into the light component return buffer tank 33 can be precisely controlled, thereby achieving precise control of the product gas return ratio. The light component return buffer tank 33 reduces pressure variations at the return gas end, ensuring that the flow rate of return gas entering each adsorption tower 2 is the same under the same return ratio. The second mass flow meter 35 can monitor the return light component product gas flow rate Q1 in real time, and the first mass flow meter 34 obtains the output light component product gas flow rate Q2. The return ratio can then be calculated as Q1 / (Q1+Q2).

[0028] Similarly, the heavy component reflux unit 4 is equipped with a heavy component product gas buffer tank 42, a second piston pump 43, a heavy component reflux buffer tank 44, a fourth mass flow meter 46, and a third mass flow meter 45. The product gas buffer tank, piston pump, reflux buffer tank, and mass flow meter on the two reflux pipelines effectively solve the problem that traditional pressure swing adsorption equipment cannot accurately adjust and quantitatively calculate the reflux ratio. When the adsorption tower 2 is close to saturation, the vacuum pump 41 evacuates the adsorption tower 2 to desorb the heavy component gas adsorbed by the adsorbent. The heavy component product gas can be transported to the outside through the vacuum pump 41, the heavy component product gas buffer tank 42 and the third mass flow meter 45. The heavy component product gas from the outlet of the third mass flow meter 45 can be introduced into a gas analyzer to detect the content of each component. The heavy component product gas can be reintroduced into the adsorption tower 2 for replacement through the heavy component product gas buffer tank 42, the second piston pump 43, the heavy component reflux buffer tank 44 and the fourth mass flow meter 46. The fourth mass flow meter 46 can monitor the flow rate Q3 of the refluxed heavy component product gas in real time, and then obtain the flow rate Q4 of the heavy component product gas output to the outside through the third mass flow meter 45. The reflux ratio can be calculated as Q3 / (Q3+Q4). In the pressure swing adsorption (PSA) system of this application, the concentrations of the light and heavy component products fluctuate. Therefore, it is necessary to introduce both the light component product gas from the first outlet 311 and the heavy component product gas from the third outlet 421 into a gas analyzer to calculate the actual gas flow rate. The gas distribution unit 1 is the feed end of the adsorption tower 2, and the flow rates of each component gas at the feed end can be obtained by the mass flow controller 12. Comparing the flow rates of each component at the feed end with the sum of the flow rates of each component at the two outlets determines whether the system maintains mass conservation. If the flow rates at the feed end and the outlets are equal, it indicates that the system has reached a steady-state cycle. Therefore, using the PSA system of this application greatly facilitates operators in precisely optimizing the reflux ratio, thereby achieving higher recovery rates and purity of the product gas.

[0029] Furthermore, the adsorption tower 2 is cylindrical, with an internal diameter of 10-100 mm and a height of 20-1500 mm. The ratio of the height to the internal diameter is 2 / 1-50 / 1. The adsorption tower 2 can be flexibly selected and replaced with various sizes and aspect ratios according to experimental requirements to adapt to different process conditions and performance evaluation requirements.

[0030] Furthermore, the gas distribution unit 1 also includes a raw material gas buffer tank 14 and a fifth mass flow meter 15. The raw material gas buffer tank 14 and the fifth mass flow meter 15 are sequentially connected to the outlet of the mixing tank 13, and the outlet of the fifth mass flow meter 15 is connected to the first pipeline 21. After the component gases are mixed evenly in the mixing tank 13, they enter the raw material gas buffer tank 14. Introducing the gas in the raw material gas buffer tank 14 into a gas analyzer can verify the true component content of the distributed gas, facilitating the monitoring of real-time changes in the gas composition of the pressure swing adsorption system.

[0031] Furthermore, the volume ratio of the light component product gas buffer tank 31, the light component reflux buffer tank 33, the heavy component product gas buffer tank 42, the heavy component reflux buffer tank 44, and the raw material gas buffer tank 14 to the adsorption tower 2 is all in the range of 1 / 1 to 15 / 1. The volume of each buffer tank is designed to match the volume of the adsorption tower 2. In some embodiments, the internal diameter of each buffer tank is 10-20 mm, the height is 30-100 mm, and the ratio of height to internal diameter is 2 / 1 to 10 / 1, which can ensure the stability of gas component concentration and flow rate in the pressure swing adsorption system.

[0032] Furthermore, the internal diameters of the first pipe 21 and the second pipe 22 are 3-10 mm. The internal diameter of the pipes used to transport gas in the pressure swing adsorption system needs to be compatible with the volume of the adsorption tower 2. If the pipe diameter is too small, it will increase the resistance during gas flow, lengthen the pressure swing adsorption cycle time, and reduce the system yield. If the pipe diameter is too large, it will increase the proportion of residual gas in the pipe and reduce the separation effect of pressure swing adsorption.

[0033] In some embodiments, the adsorption tower 2 has an internal diameter of 32 mm and a height of 1090 mm; the light component product gas buffer tank 31, the light component reflux buffer tank 33, the heavy component product gas buffer tank 42, the heavy component reflux buffer tank 44, and the raw material gas buffer tank 14 all have a volume of 10 L, an internal diameter of 15 mm, and a height of 60 mm; the internal diameter of the pipelines for conveying gas in the adsorption tower 2 in the light component reflux unit 3 and the heavy component reflux unit 4 is 8 mm.

[0034] Furthermore, the pressure swing adsorption system also includes a heating device 5, which is used to heat the outer wall of the adsorption tower 2.

[0035] In some embodiments, the heating device 5 is a heating jacket, which acts directly on the outer wall of the adsorption tower 2, heating the adsorption tower 2 to a specified temperature via electric heating. Before the pressure swing adsorption experiment begins, the adsorption tower 2 can be heated to a higher temperature to ensure the activation state of the adsorbent. Preferably, the heating temperature range is 200-500℃. Alternatively, the adsorption tower 2 can be heated to the experimental temperature required for the raw gas to simulate the pressure swing adsorption experiment at the experimental temperature, making the obtained pressure swing adsorption separation effect more reliable. Preferably, the heating temperature range is 30-200℃.

[0036] Furthermore, the first pipeline 21 is equipped with a first pneumatic valve 211, which connects the outlet of the gas distribution unit 1 to the inlet of the adsorption tower 2; the second pipeline 22 is equipped with a second pneumatic valve 221 and a third pipeline 222, whereby the second pneumatic valve 221 connects the outlet of the adsorption tower 2 to the inlet of the light component product gas buffer tank 31, and the second pipelines 22 of the two adsorption towers 2 are connected through the third pipeline 222, and the third pipeline 222 is located at the adsorption tower 2. Between tower 2 and the second pneumatic valve 221, a third pneumatic valve 2221 is provided on the third pipeline 222; a fourth pneumatic valve 36 is provided at the outlet of the second mass flow meter 35, and the fourth pneumatic valve 36 is connected to the second pipeline 22; a fifth pneumatic valve 47 is provided at the inlet of the vacuum pump 41, and the vacuum pump 41 is connected to the adsorption tower 2 through the fifth pneumatic valve 47; a sixth pneumatic valve 48 is provided at the outlet of the fourth mass flow meter 46, and the sixth pneumatic valve 48 is connected to the first pipeline 21.

[0037] In this embodiment, the pressure swing adsorption system is operated according to the corresponding process by adjusting the opening and closing of each pneumatic valve. For example, the pneumatic valve is connected to an air compressor as a power device. The gas outlet pressure of the air compressor is 1-10 bar, the suction pressure of the vacuum pump 41 is 0.01-0.5 bar, and the pressurization pressure of the first piston pump 32 and the second piston pump 43 is 1-10 bar. Through these three power devices, various adsorption processes such as pressure swing adsorption (PSA), vacuum adsorption (VSA), vacuum pressure swing adsorption (PVSA), and dual reflux pressure swing adsorption (DR-PSA) can be flexibly realized, which can meet the needs of different adsorbents, gas components and separation conditions.

[0038] In some embodiments, the light component product gas can be transported to the outside via the second pneumatic valve 221, the light component product gas buffer tank 31, and the first mass flow meter 34, or it can be returned to the adsorption tower 2 via the light component product gas buffer tank 31, the first piston pump 32, the light component reflux buffer tank 33, the second mass flow meter 35, and the fourth pneumatic valve 36. When the adsorption tower 2 is close to saturation, the fifth pneumatic valve 47 is opened and the other pneumatic valves are closed. The vacuum pump 41 evacuates the adsorption tower 2 to desorb the heavy component gas adsorbed by the adsorbent. The heavy component product gas can be transported to the outside via the vacuum pump 41, the heavy component product gas buffer tank 42, and the third mass flow meter 45, or it can be reintroduced into the adsorption tower 2 for replacement via the heavy component product gas buffer tank 42, the second piston pump 43, the heavy component reflux buffer tank 44, the fourth mass flow meter 46, and the sixth pneumatic valve 48.

[0039] Furthermore, the pressure swing adsorption system also includes an automatic control device (not specifically shown in the figure), which is electrically connected to the first pneumatic valve 211, the second pneumatic valve 221, the third pneumatic valve 2221, the fourth pneumatic valve 36, the fifth pneumatic valve 47, and the sixth pneumatic valve 48, respectively. The automatic control device can output electrical signals to control the opening and closing of each pneumatic valve, thereby realizing the automated operation of the pressure swing adsorption system according to the set process program.

[0040] Furthermore, the gas distribution unit 1 also includes multiple one-way valves 16, each one-to-one connected to the outlet of the mass flow controller 12 and each one-way valve 16 connected to the inlet of the mixing tank 13. The one-way valves 16 can prevent gas backflow and avoid contamination of the gas path of the gas distribution unit 1.

[0041] Furthermore, the mixing tank 13 is equipped with metal baffles inside. This facilitates a more uniform mixing of the component gases entering the mixing tank 13.

[0042] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this application is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this application should also fall within the protection scope of the claims of this application. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this application.

Claims

1. A pressure swing adsorption system, characterized in that, include: Gas distribution unit, adsorption tower, light component reflux unit, heavy component reflux unit, and gas analyzer; The gas distribution unit includes multiple pure component gas cylinders, multiple mass flow controllers, and a gas mixing tank. Each mass flow controller is connected to the outlet of the pure component gas cylinder and to the inlet of the gas mixing tank. There are two adsorption towers. Each adsorption tower has a first pipeline at one end and a second pipeline at the other end. The outlet of the gas mixing tank is connected to the adsorption tower through the first pipeline. The light component reflux unit includes a light component product gas buffer tank, a first piston pump, a light component reflux buffer tank, a first mass flow meter, and a second mass flow meter. The inlet of the light component product gas buffer tank is connected to the adsorption tower through the second pipeline. The light component product gas buffer tank has a first outlet and a second outlet. The first mass flow meter and the gas analyzer are connected in sequence to the first outlet. The second mass flow meter, the light component reflux buffer tank, the first piston pump, and the second outlet are connected in series. The outlet of the second mass flow meter is connected to the second pipeline. The heavy component reflux unit includes a vacuum pump, a heavy component product gas buffer tank, a second piston pump, a heavy component reflux buffer tank, a third mass flow meter, and a fourth mass flow meter. The inlet of the vacuum pump is connected to the adsorption tower, the inlet of the heavy component product gas buffer tank is connected to the outlet of the vacuum pump, the heavy component product gas buffer tank has a third outlet and a fourth outlet, the third mass flow meter and the gas analyzer are connected in sequence to the third outlet, the fourth mass flow meter, the heavy component reflux buffer tank, the second piston pump, and the fourth outlet are connected in series, and the outlet of the fourth mass flow meter is connected to the first pipeline.

2. The pressure swing adsorption system as described in claim 1, characterized in that, The adsorption tower is cylindrical, with an internal diameter of 10-100 mm and a height of 20-1500 mm. The ratio of the height to the internal diameter is 2 / 1-50 / 1.

3. The pressure swing adsorption system as described in claim 2, characterized in that, The gas distribution unit also includes a raw gas buffer tank and a fifth mass flow meter. The raw gas buffer tank and the fifth mass flow meter are connected in sequence to the outlet of the mixing tank, and the outlet of the fifth mass flow meter is connected to the first pipeline.

4. The pressure swing adsorption system as described in claim 3, characterized in that, The volume ratio of the light component product gas buffer tank, the light component reflux buffer tank, the heavy component product gas buffer tank, the heavy component reflux buffer tank, and the raw material gas buffer tank to the adsorption tower is 1 / 1 to 15 / 1.

5. The pressure swing adsorption system as described in claim 2, characterized in that, The internal diameter of the first and second pipes is 3-10 mm.

6. The pressure swing adsorption system as described in claim 1, characterized in that, It also includes a heating device for heating the outer wall of the adsorption tower.

7. The pressure swing adsorption system as described in claim 1, characterized in that, The first pipeline is equipped with a first pneumatic valve, which is used to connect the outlet of the gas distribution unit to the inlet of the adsorption tower; the second pipeline is equipped with a second pneumatic valve and a third pipeline, the second pneumatic valve is used to connect the outlet of the adsorption tower to the inlet of the light component product gas buffer tank, the second pipelines of the two adsorption towers are connected through the third pipeline, and the third pipeline is located between the adsorption tower and the second pneumatic valve, and the third pipeline is equipped with a third pneumatic valve; The outlet of the second mass flow meter is provided with a fourth pneumatic valve, which is connected to the second pipeline; the inlet of the vacuum pump is provided with a fifth pneumatic valve, which is connected to the adsorption tower through the fifth pneumatic valve; the outlet of the fourth mass flow meter is provided with a sixth pneumatic valve, which is connected to the first pipeline.

8. The pressure swing adsorption system as described in claim 7, characterized in that, It also includes an automatic control device, which is electrically connected to the first pneumatic valve, the second pneumatic valve, the third pneumatic valve, the fourth pneumatic valve, the fifth pneumatic valve and the sixth pneumatic valve respectively.

9. The pressure swing adsorption system as described in claim 1, characterized in that, The gas distribution unit also includes multiple one-way valves, each of which is connected to the outlet of the mass flow controller and to the inlet of the mixing tank.

10. The pressure swing adsorption system as described in claim 1, characterized in that, The mixing tank is equipped with metal baffles inside.

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