Air pressure nitrogen production device and method

Abstract

The invention relates to an air pressure nitrogen making device and method.The air pressure nitrogen making device comprises an air compressor, a left adsorption tower, a right adsorption tower and a nitrogen storage tank, the air compressor is connected with a first pipeline, and the first pipeline is connected and communicated with the bottom of the left adsorption tower and the bottom of the right adsorption tower through a first branch and a second branch; the upper part of the left adsorption tower and the upper part of the right adsorption tower are respectively connected and communicated with a second pipeline through a third branch and a fourth branch; the second pipeline is connected and communicated with a nitrogen storage tank; a left suction air inlet valve is arranged on the first branch, and a right suction air inlet valve is arranged on the second branch; a left air suction valve is arranged on the third branch, and a right air suction valve is arranged on the fourth branch; the left adsorption tower and the right adsorption tower are also communicated through a pressure equalizing pipeline; the bottom of the left adsorption tower and the bottom of the right adsorption tower are connected and communicated through an exhaust pipeline, the upper part of the left adsorption tower and the upper part of the right adsorption tower are connected and communicated through a back flushing pipeline, and a left exhaust valve and a right exhaust valve are respectively arranged on the exhaust pipeline.

Description

Technical Field

[0001] The present invention relates to the field related to natural gas stations, and in particular to an air pressure nitrogen production device and method. Background Art

[0002] In domestic natural gas stations, nitrogen is required for replacement when it comes to commissioning or pipeline opening operations. Nitrogen is usually transported to the site via liquid nitrogen trucks or nitrogen cylinders. After the liquid nitrogen truck is transported to the station, it needs to be vaporized by a vaporizer, which may cause liquid nitrogen leakage and frostbite. The vaporizer works for a long time, which may cause thin ice on the outlet, affecting the working effect of the vaporizer and thus the nitrogen replacement efficiency. Nitrogen cylinders are usually compressed nitrogen above 15MPa, and there may be a risk of leakage during transportation. A pressure reducing valve must be installed during on-site use, which also poses a risk of leakage and high-pressure gas shock injuries. Summary of the invention

[0003] In order to solve one or more technical problems existing in the prior art, the present invention provides an air pressure nitrogen production device and method.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: an air pressure nitrogen generation device, comprising an air compressor, a left adsorption tower, a right adsorption tower and a nitrogen storage tank, wherein the air compressor is connected to a first pipeline, the first pipeline is connected and communicated with the bottom of the left adsorption tower and the bottom of the right adsorption tower respectively through a first branch and a second branch, the upper part of the left adsorption tower and the upper part of the right adsorption tower are connected and communicated with the second pipeline respectively through a third branch and a fourth branch, and the second pipeline is connected and communicated with the nitrogen storage tank;

[0005] The first branch is provided with a left suction inlet valve, and the second branch is provided with a right suction inlet valve; the third branch is provided with a left suction outlet valve, and the fourth branch is provided with a right suction outlet valve; the left adsorption tower and the right adsorption tower are also connected through a pressure equalizing pipeline, and a pressure equalizing valve is provided on the pressure equalizing pipeline; the bottom of the left adsorption tower and the bottom of the right adsorption tower are connected and connected through an exhaust pipeline, and the upper part of the left adsorption tower and the upper part of the right adsorption tower are connected and connected through a back-blowing pipeline, and a back-blowing valve is provided on the back-blowing pipeline, and a muffler is provided on the exhaust pipeline, and a left exhaust valve and a right exhaust valve are respectively provided on the exhaust pipelines on both sides of the muffler, and the left exhaust valve is arranged close to the left adsorption tower, and the right exhaust valve is arranged close to the right adsorption tower.

[0006] The beneficial effects of the present invention are as follows: the air pressure nitrogen production device of the present invention can quickly obtain the required nitrogen by setting an air compressor, which greatly meets the demand of station personnel for nitrogen, reduces the nitrogen procurement cost, achieves the effect of ready-to-use, avoids the risk of high-pressure gas injuring people and liquid nitrogen frostbite, and improves the safety performance of natural gas stations.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the pressure equalizing pipeline includes an upper pressure equalizing pipeline and a lower pressure equalizing pipeline, and the pressure equalizing valve includes an upper pressure equalizing valve and a lower pressure equalizing valve. The upper part of the left adsorption tower is connected and communicated with the upper part of the right adsorption tower through the upper pressure equalizing pipeline, and an upper pressure equalizing valve is provided on the upper pressure equalizing pipeline; the bottom of the left adsorption tower is connected and communicated with the bottom of the right adsorption tower through the lower pressure equalizing pipeline, and a lower pressure equalizing valve is provided on the lower pressure equalizing pipeline.

[0009] The beneficial effect of adopting the above further solution is that by setting up upper and lower pressure equalizing pipelines, rapid and stable pressure equalization between the left adsorption tower and the right adsorption tower can be achieved.

[0010] Furthermore, an air intake valve and an air storage tank are provided on the first pipeline, and the air intake valve is located downstream of the air storage tank.

[0011] Furthermore, a nitrogen buffer tank is also provided on the second pipeline.

[0012] Furthermore, a nitrogen producing valve is also provided on the second pipeline downstream of the nitrogen buffer tank.

[0013] Furthermore, a nitrogen filter pressure reducing valve is also provided on the second pipeline downstream of the nitrogen buffer tank.

[0014] Furthermore, the nitrogen filter pressure reducing valve is connected to an analysis pipeline, and the analysis pipeline is connected to a nitrogen analyzer.

[0015] The beneficial effect of adopting the above further scheme is that the nitrogen analyzer can detect the purity of the nitrogen after adsorption.

[0016] Furthermore, a test port is provided on the analysis pipeline.

[0017] Furthermore, the analysis pipeline is also provided with a control valve, and the control valve is located upstream of the test port.

[0018] An air pressure nitrogen production method is implemented by using the air pressure nitrogen production device, comprising the following steps:

[0019] Left suction mode: the right suction inlet valve and the right suction outlet valve are closed, the left suction inlet valve and the left suction outlet valve are opened, the air is compressed by the air compressor, and the compressed air enters the left adsorption tower through the first pipeline and the first branch, the pressure in the left adsorption tower increases, the oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve in the left adsorption tower, and the unadsorbed nitrogen passes through the carbon molecular sieve and enters the nitrogen storage tank through the third branch and the second pipeline;

[0020] Pressure equalization mode: After the left suction is completed, the left suction inlet valve and the left suction outlet valve are closed, the pressure equalization valve is opened, and the left adsorption tower and the right adsorption tower are connected through the pressure equalization pipeline to balance the pressure of the two towers;

[0021] Right suction mode: After the pressure equalization is completed, the right suction inlet valve and the right suction outlet valve are opened, the air is compressed by the air compressor, and the compressed air enters the right adsorption tower through the first pipeline and the second branch. The pressure in the right adsorption tower increases, and the oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve in the right adsorption tower. The unadsorbed nitrogen passes through the carbon molecular sieve and enters the nitrogen storage tank through the fourth branch and the second pipeline.

[0022] Pressure equalization mode: After the right suction is completed, the right suction inlet valve and the right suction outlet valve are closed, the pressure equalization valve is opened, and the left adsorption tower and the right adsorption tower are connected through the pressure equalization pipeline to balance the pressure of the two towers;

[0023] Desorption mode: When the right absorption mode is in progress, the left exhaust valve and backflush valve are opened, and the nitrogen in the right adsorption tower is used to purge the oxygen molecules adsorbed by the carbon molecular sieve in the left adsorption tower through the backflush pipeline, and is discharged through the left exhaust valve on the exhaust pipeline;

[0024] While the left suction mode is in progress, the right exhaust valve and backflush valve are opened, and the nitrogen in the left adsorption tower is used to purge the oxygen molecules adsorbed by the carbon molecular sieve in the right adsorption tower through the backflush pipeline, and is discharged through the right exhaust valve on the exhaust pipeline.

[0025] The beneficial effects of the present invention are as follows: the air pressure nitrogen production method of the present invention can achieve the effect of immediate production and immediate use of nitrogen, thereby improving the safety performance of natural gas stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the air pressure nitrogen generation device of the present invention.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1. Air compressor; 2. Left adsorption tower; 3. Right adsorption tower; 5. First pipeline; 6. First branch; 7. Second branch; 8. Third branch; 9. Fourth branch; 10. Second pipeline; 11. Left suction inlet valve; 12. Right suction inlet valve; 13. Left suction outlet valve; 14. Right suction outlet valve; 15. Upper pressure equalizing valve; 16. Lower pressure equalizing valve; 17. Upper pressure equalizing pipeline; 18. Lower pressure equalizing pipeline; 19. Exhaust pipeline; 20. Backflush pipeline; 21. Backflush valve; 22. Muffler; 23. Left exhaust valve; 24. Right exhaust valve; 25. Air intake valve; 27. Nitrogen buffer tank; 28. Nitrogen production valve; 29. ​​Nitrogen filter pressure reducing valve; 30. Analysis pipeline; 31. Nitrogen analyzer; 32. Test port; 33. Control valve. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0030] like Figure 1 As shown, an air pressure nitrogen generation device of the present embodiment comprises an air compressor 1, a left adsorption tower 2, a right adsorption tower 3 and a nitrogen storage tank, wherein the air compressor 1 is connected to a first pipeline 5, the first pipeline 5 is connected and communicated with the bottom of the left adsorption tower 2 and the bottom of the right adsorption tower 3 respectively through a first branch 6 and a second branch 7, the upper part of the left adsorption tower 2 and the upper part of the right adsorption tower 3 are connected and communicated with a second pipeline 10 respectively through a third branch 8 and a fourth branch 9, and the second pipeline 10 is connected and communicated with the nitrogen storage tank;

[0031] The first branch 6 is provided with a left air intake valve 11, and the second branch 7 is provided with a right air intake valve 12; the third branch 8 is provided with a left air outlet valve 13, and the fourth branch 9 is provided with a right air outlet valve 14; the left adsorption tower 2 and the right adsorption tower 3 are also connected through a pressure equalizing pipeline, and a pressure equalizing valve is provided on the pressure equalizing pipeline; the bottom of the left adsorption tower 2 and the bottom of the right adsorption tower 3 are connected and communicated through an exhaust pipeline 19, and the upper part of the left adsorption tower 2 and the upper part of the right adsorption tower 3 are connected and communicated through a back-blowing pipeline 20, and a back-blowing valve 21 is provided on the back-blowing pipeline 20, and a muffler 22 is provided on the exhaust pipeline 19, and a left exhaust valve 23 and a right exhaust valve 24 are respectively provided on the exhaust pipeline 19 on both sides of the muffler 22, and the left exhaust valve 23 is arranged close to the left adsorption tower 2, and the right exhaust valve 24 is arranged close to the right adsorption tower 3.

[0032] The air after passing through the air compressor 1 is also pre-processed by a pre-processing device, which may be a dust collector, an oil removal device and a dryer, for removing dust, oil and drying the compressed air.

[0033] like Figure 1 As shown, the pressure equalizing pipeline of this embodiment includes an upper pressure equalizing pipeline 17 and a lower pressure equalizing pipeline 18, and the pressure equalizing valve includes an upper pressure equalizing valve 15 and a lower pressure equalizing valve 16. The upper part of the left adsorption tower 2 is connected and communicated with the upper part of the right adsorption tower 3 through the upper pressure equalizing pipeline 17, and the upper pressure equalizing valve 15 is provided on the upper pressure equalizing pipeline 17; the bottom of the left adsorption tower 2 is connected and communicated with the bottom of the right adsorption tower 3 through the lower pressure equalizing pipeline 18, and the lower pressure equalizing valve 16 is provided on the lower pressure equalizing pipeline 18. By setting the upper and lower pressure equalizing pipelines, rapid and stable pressure equalization between the left adsorption tower and the right adsorption tower can be achieved.

[0034] like Figure 1 As shown, the first pipeline 5 of this embodiment is provided with an air intake valve 25 and an air storage tank, and the air intake valve 25 is located downstream of the air storage tank.

[0035] like Figure 1 As shown, a nitrogen buffer tank 27 is also provided on the second pipeline 10 of this embodiment.

[0036] like Figure 1 As shown, in this embodiment, a nitrogen producing valve 28 is further provided on the second pipeline 10 downstream of the nitrogen buffer tank 27. The number of nitrogen producing valves may be one or two.

[0037] like Figure 1 As shown, in this embodiment, a nitrogen filtering pressure reducing valve 29 is also provided on the second pipeline 10 downstream of the nitrogen buffer tank 27 .

[0038] like Figure 1 As shown, the nitrogen filter pressure reducing valve 29 of this embodiment is connected to an analysis pipeline 30, and the analysis pipeline 30 is connected to a nitrogen analyzer 31. The nitrogen analyzer can detect the purity of the nitrogen after adsorption. The nitrogen content is determined by the nitrogen analyzer, and the nitrogen production valve is controlled by the control system to obtain nitrogen that meets the use requirements.

[0039] like Figure 1 As shown, a test port 32 is provided on the analysis pipeline 30 of this embodiment.

[0040] like Figure 1 As shown, the analysis pipeline 30 of this embodiment is further provided with a control valve 33 , and the control valve 33 is located upstream of the test port 32 .

[0041] The air pressure nitrogen production device of this embodiment can quickly obtain the required nitrogen by setting up an air compressor, which greatly meets the demand for nitrogen by station personnel, reduces the nitrogen procurement cost, achieves the effect of ready-to-use, avoids the risk of high-pressure gas injuring people and liquid nitrogen frostbite, and improves the safety performance of natural gas stations.

[0042] This embodiment also provides an air pressure nitrogen production method, which is implemented by using the above-mentioned air pressure nitrogen production device, and includes the following steps:

[0043] Left suction mode: the right suction inlet valve 12 and the right suction outlet valve 14 are closed, the left suction inlet valve 11 and the left suction outlet valve 13 are opened, the air is compressed by the air compressor 1, and the compressed air enters the left adsorption tower 2 through the first pipeline 5 and the first branch 6, the pressure in the left adsorption tower 2 increases, the oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve in the left adsorption tower 2, and the unadsorbed nitrogen passes through the carbon molecular sieve and enters the nitrogen storage tank through the third branch 8 and the second pipeline 10;

[0044] Pressure equalization mode: After the left suction is completed, the left suction inlet valve 11 and the left suction outlet valve 13 are closed, the pressure equalization valve is opened, and the left adsorption tower 2 and the right adsorption tower 3 are connected through the pressure equalization pipeline to balance the pressure of the two towers;

[0045] Right suction mode: after the pressure equalization is completed, the right suction inlet valve 12 and the right suction outlet valve 14 are opened, the air is compressed by the air compressor 1, and the compressed air enters the right adsorption tower 3 through the first pipeline 5 and the second branch 7. The pressure in the right adsorption tower 3 increases, and the oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve in the right adsorption tower 3. The unadsorbed nitrogen passes through the carbon molecular sieve and enters the nitrogen storage tank through the fourth branch 9 and the second pipeline 10;

[0046] Pressure equalization mode: After the right suction is completed, the right suction inlet valve 12 and the right suction outlet valve 14 are closed, the pressure equalization valve is opened, and the left adsorption tower 2 and the right adsorption tower 3 are connected through the pressure equalization pipeline to balance the pressure of the two towers;

[0047] Desorption mode: while the right absorption mode is in progress, the left exhaust valve 23 and the back-blowing valve 21 are opened, and the nitrogen in the right adsorption tower 3 is used to purge the oxygen molecules adsorbed by the carbon molecular sieve in the left adsorption tower 2 through the back-blowing pipeline 20, and is discharged through the left exhaust valve 23 on the exhaust pipeline 19;

[0048] While the left suction mode is in progress, the right exhaust valve 24 and the backflush valve 21 are opened, and the nitrogen in the left adsorption tower 2 is used to purge the oxygen molecules adsorbed by the carbon molecular sieve in the right adsorption tower 3 through the backflush pipeline 20, and is discharged through the right exhaust valve 24 on the exhaust pipeline 19.

[0049] Among them, the back-blowing valve 21 is a normally open valve, and nitrogen is blown through a normally open back-blowing valve to purge the adsorption tower that is being desorbed, and the oxygen in the tower is blown out of the adsorption tower. This process is called back-blowing, which is carried out simultaneously with desorption. The left suction mode, equal pressure mode, right suction mode, equal pressure mode, and left suction mode are circulated continuously.

[0050] In this embodiment, the left suction mode and the right suction mode each last for several tens of seconds, and the pressure equalization mode lasts for 2 to 3 seconds.

[0051] The air compressor nitrogen production method of this embodiment installs a nitrogen production system on an existing air compressor, uses compressed air as a raw material, and uses a carbon molecular sieve as an adsorbent. It utilizes the principle of pressurized adsorption and reduced-pressure desorption to adsorb and release oxygen from the air, thereby separating the required nitrogen. This greatly meets the nitrogen use needs of station personnel, reduces nitrogen procurement costs, achieves the effect of ready-to-use production, and improves the safety performance of natural gas stations.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air pressure nitrogen production device, characterized in that: It includes an air compressor, a left adsorption tower, a right adsorption tower and a nitrogen storage tank, wherein the air compressor is connected to a first pipeline, the first pipeline is connected and communicated with the bottom of the left adsorption tower and the bottom of the right adsorption tower respectively through a first branch and a second branch, the upper part of the left adsorption tower and the upper part of the right adsorption tower are connected and communicated with the second pipeline respectively through a third branch and a fourth branch, and the second pipeline is connected and communicated with the nitrogen storage tank; The first branch is provided with a left suction inlet valve, and the second branch is provided with a right suction inlet valve; the third branch is provided with a left suction outlet valve, and the fourth branch is provided with a right suction outlet valve; the left adsorption tower and the right adsorption tower are also connected through a pressure equalizing pipeline, and a pressure equalizing valve is provided on the pressure equalizing pipeline; the bottom of the left adsorption tower and the bottom of the right adsorption tower are connected and connected through an exhaust pipeline, and the upper part of the left adsorption tower and the upper part of the right adsorption tower are connected and connected through a back-blowing pipeline, and a back-blowing valve is provided on the back-blowing pipeline, and a muffler is provided on the exhaust pipeline, and a left exhaust valve and a right exhaust valve are respectively provided on the exhaust pipelines on both sides of the muffler, and the left exhaust valve is arranged close to the left adsorption tower, and the right exhaust valve is arranged close to the right adsorption tower.

2. The air pressure nitrogen generation device according to claim 1, characterized in that: The pressure equalizing pipeline includes an upper pressure equalizing pipeline and a lower pressure equalizing pipeline, and the pressure equalizing valve includes an upper pressure equalizing valve and a lower pressure equalizing valve. The upper part of the left adsorption tower is connected and communicated with the upper part of the right adsorption tower through the upper pressure equalizing pipeline, and an upper pressure equalizing valve is provided on the upper pressure equalizing pipeline; the bottom of the left adsorption tower is connected and communicated with the bottom of the right adsorption tower through the lower pressure equalizing pipeline, and a lower pressure equalizing valve is provided on the lower pressure equalizing pipeline.

3. The air pressure nitrogen generation device according to claim 1, characterized in that: An air intake valve and an air storage tank are provided on the first pipeline, and the air intake valve is located downstream of the air storage tank.

4. The air pressure nitrogen generation device according to claim 1, characterized in that: The second pipeline is also provided with a nitrogen buffer tank.

5. The air pressure nitrogen generation device according to claim 4, characterized in that: A nitrogen producing valve is also provided on the second pipeline downstream of the nitrogen buffer tank.

6. The air pressure nitrogen generation device according to claim 4, characterized in that: A nitrogen filter pressure reducing valve is also provided on the second pipeline downstream of the nitrogen buffer tank.

7. The air pressure nitrogen generation device according to claim 6, characterized in that: The nitrogen filter pressure reducing valve is connected with an analysis pipeline, and the analysis pipeline is connected with a nitrogen analyzer.

8. The air pressure nitrogen generation device according to claim 7, characterized in that: The analysis pipeline is provided with a test port.

9. The air pressure nitrogen generation device according to claim 8, characterized in that: The analysis pipeline is also provided with a control valve, and the control valve is located upstream of the test port.

10. A method for producing nitrogen under air pressure, characterized in that: The method is realized by using an air pressure nitrogen compression device as claimed in any one of claims 1 to 9, The following steps are involved: Left suction mode: the right suction inlet valve and the right suction outlet valve are closed, the left suction inlet valve and the left suction outlet valve are opened, the air is compressed by the air compressor, and the compressed air enters the left adsorption tower through the first pipeline and the first branch, the pressure in the left adsorption tower increases, the oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve in the left adsorption tower, and the unadsorbed nitrogen passes through the carbon molecular sieve and enters the nitrogen storage tank through the third branch and the second pipeline; Pressure equalization mode: After the left suction is completed, the left suction inlet valve and the left suction outlet valve are closed, the pressure equalization valve is opened, and the left adsorption tower and the right adsorption tower are connected through the pressure equalization pipeline to balance the pressure of the two towers; Right suction mode: After the pressure equalization is completed, the right suction inlet valve and the right suction outlet valve are opened, the air is compressed by the air compressor, and the compressed air enters the right adsorption tower through the first pipeline and the second branch. The pressure in the right adsorption tower increases, and the oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve in the right adsorption tower. The unadsorbed nitrogen passes through the carbon molecular sieve and enters the nitrogen storage tank through the fourth branch and the second pipeline. Pressure equalization mode: After the right suction is completed, the right suction inlet valve and the right suction outlet valve are closed, the pressure equalization valve is opened, and the left adsorption tower and the right adsorption tower are connected through the pressure equalization pipeline to balance the pressure of the two towers; Desorption mode: When the right absorption mode is in progress, the left exhaust valve and backflush valve are opened, and the nitrogen in the right adsorption tower is used to purge the oxygen molecules adsorbed by the carbon molecular sieve in the left adsorption tower through the backflush pipeline, and is discharged through the left exhaust valve on the exhaust pipeline; While the left suction mode is in progress, the right exhaust valve and backflush valve are opened, and the nitrogen in the left adsorption tower is used to purge the oxygen molecules adsorbed by the carbon molecular sieve in the right adsorption tower through the backflush pipeline, and is discharged through the right exhaust valve on the exhaust pipeline.

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