High-purity nitrogen cryogenic nitrogen generation device and preparation method

Abstract

The invention relates to the technical field of nitrogen-making equipment, in particular to a high-purity nitrogen cryogenic nitrogen-making device and a preparation method.The high-purity nitrogen cryogenic nitrogen-making device comprises a supporting component, a displacement device is fixedly installed at the bottom end of the supporting component, and first hydraulic cylinders are fixedly installed at the top ends of the two sides of the supporting component; the displacement device comprises a branch pipe, a main flow pipe, treatment cavities, pressure release valves and a flow guide pipe, the branch pipe is fixedly installed at the side end of the main flow pipe, the main flow pipe is fixedly installed at the centers of the top ends and the bottom ends of the treatment cavities, the pressure release valves are fixedly installed at the side ends of the bottoms of the treatment cavities, and connecting base frames are symmetrically and fixedly installed between the two treatment cavities; first springs are fixedly mounted at the ends, away from the interior of the treatment cavity, of the branch pipes and are annularly distributed, and plugging plates are fixedly mounted at the ends, close to the treatment cavity, of the first springs. Through the arrangement of the displacement device and the supporting part, the purposes of efficient interchange and synchronous internal activation of the molecular sieve in the cryogenic nitrogen making machine are achieved.

Description

Technical Field

[0001] This invention relates to the field of nitrogen production equipment technology, specifically to a high-purity nitrogen cryogenic nitrogen production device and its preparation method. Background Technology

[0002] Cryogenic nitrogen generators, also known as "cryogenic air separation nitrogen generators," are industrial equipment that utilizes the different boiling points of various components in the air to separate nitrogen gas on a large scale and with high purity through deep freezing and distillation. It is currently the most mature and economical technology for obtaining high-purity, large quantities of nitrogen gas in industry.

[0003] For example, a cryogenic nitrogen production device with Chinese patent publication number CN222165443U includes, in sequence, a self-cleaning filter, an air compressor, an air precooling unit, a molecular sieve adsorber, a booster turbine expander, and a nitrogen distillation tower. The liquid nitrogen outlet of the nitrogen distillation tower is connected to a gas supply and storage tank assembly, which includes a main gas supply pipeline and a gas storage branch pipeline connected in parallel at the lower part of the main gas supply pipeline.

[0004] Currently, when using molecular sieves in existing cryogenic nitrogen generators, the molecular sieves are installed independently. This means that when the molecular sieves need cleaning and activation, the entire equipment often needs to be shut down until the molecular sieves are activated before it can be run again. Cryogenic nitrogen generators that operate in this way cannot achieve efficient interchangeability and synchronous internal activation of molecular sieves. Therefore, an improved device is needed to address these issues. Summary of the Invention

[0005] To address the problems in the prior art, this invention provides a high-purity nitrogen cryogenic nitrogen production device and preparation method.

[0006] The technical solution adopted by this invention to solve its technical problem is: a high-purity nitrogen cryogenic nitrogen generation device and preparation method, including a support component, a displacement device fixedly installed at the bottom end of the support component, and first hydraulic cylinders fixedly installed at the top ends of both sides of the support component. The displacement device includes a branch pipe, a main pipe, a processing chamber, a pressure relief valve, and a guide pipe. The branch pipe is fixedly installed at the side end of the main pipe, the main pipe is fixedly installed at the center of the top and bottom ends of the processing chamber, the pressure relief valve is fixedly installed at the bottom side end of the processing chamber, and a connecting base frame is symmetrically fixedly installed between the two processing chambers. A first spring is fixedly installed at the inner end of the branch pipe away from the processing chamber, and the first spring is distributed in a ring. A sealing plate is fixedly installed at the end of the first spring near the processing chamber, and the guide pipe is fixedly installed at the inner center of the branch pipe away from the sealing plate.

[0007] A method for preparing a high-purity nitrogen cryogenic nitrogen generation device, comprising the following steps:

[0008] S1. Air compression: Ambient air is compressed to 0.6-1.0 MPa by an air compressor after passing through a filter to remove dust and other mechanical impurities;

[0009] S2. Purification and Removal: Compressed air first enters the pre-cooling unit and is cooled by cooling water to reduce its temperature. Then it enters the processing chamber. The processing chamber is equipped with molecular sieves. When the compressed air passes through the molecular sieves, it can adsorb and remove impurities such as moisture, carbon dioxide, and hydrocarbons from the air.

[0010] S3, Cooling and Liquefaction: The purified high-pressure air enters the main heat exchanger through the connection between the processing chamber and the heat exchanger. It undergoes countercurrent heat exchange with the low-temperature product nitrogen and waste gas from the distillation column. The high-pressure air is cooled to near the liquefaction temperature by the returning low-temperature gas, while the returning gas is reheated to near the ambient temperature. Some of the deeply cooled air is expanded by the expander, and the pressure and temperature drop sharply, so most of the air will liquefy, providing the required cooling capacity for the system.

[0011] S4. Distillation Separation: After liquefaction and cooling, the air enters the distillation column system. The air is initially separated. The oxygen with a higher boiling point is enriched at the bottom of the column to form oxygen-enriched liquid air, while the nitrogen with a lower boiling point is enriched at the top of the column to obtain impure liquid nitrogen. The oxygen-enriched liquid air and liquid nitrogen from the lower column are sent to the appropriate position in the upper column for more refined separation. Liquid oxygen flows out from the bottom of the upper column, while high-purity gaseous nitrogen is drawn out from the top of the upper column.

[0012] S5. Finally, the high-purity nitrogen product is output from the top of the column, reheated by a heat exchanger, and then sent out. The by-products oxygen and argon can also be collected separately as needed.

[0013] The beneficial effects of this invention are:

[0014] First, this invention features two processing cavities. When the first hydraulic cylinder is running, it can drive both processing cavities to move simultaneously. Thus, when the piston rod inside the first hydraulic cylinder is resetting or extending, it can always keep one processing cavity in the working position, while the other processing cavity can move to the activation area. This effectively reduces the waiting time of the equipment. Furthermore, the two processing cavities move in a straight line, avoiding positional shifts and enabling efficient interchangeability of the processing cavities.

[0015] Second, this invention allows the contact plate to shift during the displacement of the processing chamber, enabling the first rack to drive the second gear and the first gear to rotate. This allows the second and first displacement plates to approach each other, blocking the main flow pipe. Simultaneously, the branch pipe can slide and connect to the guide pipe, and the blocking plate can separate from the guide pipe, allowing the connecting hole to communicate with the inside of the branch pipe. This allows gas to be delivered into the processing chamber, activating the molecular sieve inside. Furthermore, the branch pipe at the top of the processing chamber can pump gas outward, thereby improving the activation efficiency of the processing chamber and completing the rapid activation of the molecular sieve inside the processing chamber. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a 3D physical image of the main body of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the main body from a frontal perspective in this invention;

[0019] Figure 3 This is a partial cross-sectional schematic diagram of the displacement device in this invention;

[0020] Figure 4 In this invention Figure 3 A magnified view of part A;

[0021] Figure 5 This is a three-dimensional structural diagram of the support component from a frontal view in this invention;

[0022] Figure 6 This is a three-dimensional structural diagram of the contact device from the front view in this invention;

[0023] Figure 7 This is a partial cross-sectional schematic diagram of the positioning device in this invention;

[0024] Figure 8 In this invention Figure 7 A magnified view of part B;

[0025] Figure 9 This is a three-dimensional structural diagram of the connecting device from the front view in this invention;

[0026] Figure 10 This is a frontal perspective three-dimensional structural diagram of the second embodiment of the supporting top frame in this invention.

[0027] In the diagram: 1-Displacement device, 2-Supporting component, 3-First hydraulic cylinder, 4-Branch pipe, 5-Main pipe, 6-Connecting base frame, 7-Processing chamber, 8-Pressure relief valve, 9-First spring, 10-Sealing plate, 11-Contact device, 12-Positioning device, 13-Connecting device, 14-First rack, 15-Supporting slide, 16-Contact circular plate, 17-Positioning side frame, 18-Guide rod, 19-Supporting vertical frame, 20-Photoelectric sensor, 21-Sealing 22-First displacement plate, 23-Support top frame, 24-Connecting horizontal plate, 25-Second displacement plate, 26-Second spring, 27-Connecting piece, 28-Second rack, 29-Support shaft, 30-First gear, 31-Second gear, 32-Third rack, 33-Extension rod, 34-Upper end support plate, 35-Conduit, 36-Air valve, 37-Connecting hole, 38-Second hydraulic cylinder, 39-Support top frame, 40-Alignment sleeve, 41-Guide pipe. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0029] The invention will be further described below with reference to the accompanying drawings.

[0030] Example 1

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the present invention discloses a high-purity nitrogen cryogenic nitrogen generation device and preparation method, comprising a support component 2, a displacement device 1 fixedly installed at the bottom end of the support component 2, and first hydraulic cylinders 3 fixedly installed at the top ends of both sides of the support component 2. The displacement device 1 includes a branch pipe 4, a main pipe 5, a processing chamber 7, a pressure relief valve 8, and a guide pipe 41. The branch pipe 4 is fixedly installed at the side end of the main pipe 5, the main pipe 5 is fixedly installed at the center of the top and bottom ends of the processing chamber 7, the pressure relief valve 8 is fixedly installed at the bottom side end of the processing chamber 7, and a connecting base frame 6 is symmetrically fixedly installed between the two processing chambers 7. A first spring 9 is fixedly installed at the inner end of the branch pipe 4 away from the processing chamber 7, and the first spring 9 is distributed in a ring. A sealing plate 10 is fixedly installed at the end of the first spring 9 near the processing chamber 7, and the guide pipe 41 is fixedly installed at the inner center of the branch pipe 4 away from the sealing plate 10.

[0032] like Figure 5The supporting component 2 includes a contact device 11, a positioning device 12, and a connecting device 13. The contact device 11 is fixedly installed at both ends inside the positioning device 12, and the connecting device 13 is symmetrically fixedly installed at both ends inside the positioning device 12. The connecting device 13 is located at the upper and lower ends of the contact device 11. The connection device 13 facilitates communication between the branch pipe 4 and the conduit 35.

[0033] like Figure 6 The contact device 11 includes a positioning side frame 17 and a contact circular plate 16. A support slide 15 is slidably inserted into the center of the positioning side frame 17. The contact circular plate 16 is symmetrically fixedly installed on the side end of the support slide 15. A first rack 14 is fixedly installed on the side end of the support slide 15 away from the contact circular plate 16. When the contact circular plate 16 is displaced, it can drive the first rack 14 to move.

[0034] When the contact plate 16 is pressed, the support slide 15 can drive the first rack 14 to move back to the original position.

[0035] like Figure 7 and Figure 8 The positioning device 12 includes a positioning frame 23, a support frame 19, and a guide rod 18. The guide rod 18 is fixedly installed on both sides of the positioning frame 23. The support frame 19 is fixedly installed at both ends of the bottom of the positioning frame 23. A support shaft 29 is rotatably installed inside the support frame 19. A second gear 31 is installed at the center of the support shaft 29. A first gear 30 is fixedly installed at both ends of the support shaft 29. An extension rod 33 is slidably inserted into the top and bottom ends of the support frame 19. A connecting horizontal plate 24 is installed on the extension rod 33. A second displacement plate 25 is fixedly installed at the bottom end of the connecting horizontal plate 24. A third rack 32 is fixedly installed at the bottom end of the extension rod 33. A second rack 28 is installed on the extension rod 33 at the bottom of the support frame 19. A connecting piece 27 is fixedly installed on the top of the second rack 28. A second spring 26 is fixedly installed on the top of the connecting piece 27. An upper support plate 34 is fixedly installed on the top of the second spring 26. A first displacement plate 22 is fixedly installed below the extension rod 33 at the bottom of the support frame 19. A sealing gasket 21 is fixedly installed on the top of the first displacement plate 22. A photoelectric sensor 20 is fixedly installed on the opposite side of the support frame 19. When the second gear 31 rotates, it can drive the two first gears 30 to rotate simultaneously, so that the second rack 28 and the third rack 32 can move up and down synchronously.

[0036] When the second gear 31 rotates, it can rotate through the first gear 30, thereby allowing the second rack 28 and the third rack 32 to move up and down respectively.

[0037] like Figure 9The connecting device 13 includes a conduit 35. A connecting hole 37 is provided on the outer ring of one end of the conduit 35, and the connecting holes 37 are distributed in a ring. A gas valve 36 is fixedly installed on the end of the conduit 35 away from the connecting hole 37. When the branch pipe 4 is disconnected from the photoelectric sensor 20, the gas valve 36 can be de-energized to prevent the conduit 35 above and below the support frame 19 from continuously supplying or extracting gas.

[0038] The conduit 35 is connected to the branch pipe 4, and the connecting hole 37 can release gas into the interior of the branch pipe 4.

[0039] The connecting base frame 6 is connected to the first hydraulic cylinder 3. The side end of the connecting base frame 6 away from the processing cavity 7 is slidably sleeved on the outer ring of the guide rod 18. The positioning side frame 17 is symmetrically fixedly installed on the opposite side ends of the supporting vertical frame 19. The bottom end of the first rack 14 meshes with the second gear 31. The conduit 35 is symmetrically fixedly installed on the opposite side ends of the supporting vertical frame 19. The first gear 30 meshes with the third rack 32 and the second rack 28. The top end of the upper support plate 34 is connected to the inner wall of the supporting vertical frame 19. The outer surface of the conduit 35 is in contact with the inner wall of the guide pipe 41. The sealing plate 1... The diameter of 0 is smaller than the inner diameter of branch pipe 4. The contact circular plate 16 is horizontally aligned with the processing cavity 7. The opposite side ends of the support frame 19 are provided with sliding grooves. A sealing gasket 21 is installed at the bottom end of the second displacement plate 25. The photoelectric sensor 20 is electrically connected to the air valve 36. The top ends of the support frame 19 and the positioning frame 23 are symmetrically provided with insertion holes that are compatible with the extension rod 33. The bottom of the opposite side ends of the support frame 19 is provided with displacement grooves that are compatible with the extension rod 33. The inside of the conduit 35 is hollow, and the air valve 36 is interconnected with the inside of the conduit 35.

[0040] A method for preparing a high-purity nitrogen cryogenic nitrogen generation device, comprising the following steps:

[0041] S1. Air compression: Ambient air is compressed to 0.6-1.0 MPa by an air compressor after passing through a filter to remove dust and other mechanical impurities;

[0042] S2. Purification and Removal: Compressed air first enters the pre-cooling unit and is cooled by cooling water to reduce its temperature. Then it enters the processing chamber 7. The processing chamber 7 is equipped with a molecular sieve. When the compressed air passes through the molecular sieve, it can adsorb and remove impurities such as moisture, carbon dioxide, and hydrocarbons from the air.

[0043] S3, Cooling and Liquefaction: The purified high-pressure air enters the main heat exchanger through the processing chamber 7 connected to the heat exchanger. It undergoes countercurrent heat exchange with the low-temperature product nitrogen and waste gas from the distillation column. The high-pressure air is cooled to near the liquefaction temperature by the returning low-temperature gas, while the returning gas is reheated to near the ambient temperature. Some of the deeply cooled air is expanded by the expander, and the pressure and temperature drop sharply, so most of the air will liquefy, providing the required cooling capacity for the system.

[0044] S3. Distillation Separation: After liquefaction and cooling, the air enters the distillation column system. The air is initially separated. The oxygen with a higher boiling point is enriched at the bottom of the column to form oxygen-enriched liquid air, while the nitrogen with a lower boiling point is enriched at the top of the column to obtain impure liquid nitrogen. The oxygen-enriched liquid air and liquid nitrogen from the lower column are sent to the appropriate position in the upper column for more refined separation. Liquid oxygen flows out from the bottom of the upper column, while high-purity gaseous nitrogen is drawn out from the top of the upper column.

[0045] S3. Finally, the high-purity nitrogen product is output from the top of the tower, reheated by a heat exchanger, and then sent out. The by-products oxygen and argon can also be collected separately as needed.

[0046] The working principle of Example 1 is as follows: During use, the positioning frame 23 can be moved and installed below the exhaust pipe of the precooling unit, so that the main flow pipe 5 can be aligned with the exhaust pipe. The exhaust pipe of the precooling unit is connected to the main flow pipe 5, and the main flow pipe 5 below the processing chamber 7 can be connected to the external heat exchanger. Thus, the gas discharged from the processing chamber 7 can pass through the heat exchanger to complete the air purification work. When the molecular sieve inside the processing chamber 7 needs to be activated, the seals connected to the main flow pipe 5 and the precooling unit and heat exchanger can be removed, and then the first hydraulic cylinder 3 can be opened to drive the connecting base frame 6 to move. The processing chamber 7 is installed on the connecting base frame 6, so that the connecting base frame 6 can drive the two processing chambers 7 to move simultaneously. At this time, the processing chamber to be activated The processing chamber 7 can be displaced to the side, and the activated processing chamber 7 can be moved to align with the piping of the precooling unit and heat exchanger. Then, the seals are installed on the main pipe 5 and the piping of the precooling unit and heat exchanger to facilitate air entry into the processing chamber 7. Subsequently, when the processing chamber 7 to be activated moves to the side, it can contact the contact plate 16, thereby pressing the contact plate 16 closer to the inside of the positioning side frame 17. At this time, the support slide 15 is slidably inserted into the inside of the positioning side frame 17, allowing the contact plate 16 to move linearly. Simultaneously, when the support slide 15 displaces, it drives the first rack 14 to displace along the bottom end of the second gear 31, thereby allowing the second gear 31 to drive the first gear 30 to rotate. The first gear 30 meshes with the second rack 28 and the third rack 32 respectively, so that when the first gear 30 rotates, it can drive the second rack 28 to move upward and the third rack 32 to move downward. When the second rack 28 moves upward, it can drive the first displacement plate 22 to move upward, so that the sealing gasket 21 on the first displacement plate 22 can contact the main flow pipe 5 at the bottom of the processing cavity 7. When the third rack 32 moves downward, the connecting horizontal plate 24 can drive the second displacement plate 25 to move downward until it contacts the main flow pipe 5 at the top of the processing cavity 7. Thus, the first displacement plate 22 and the second displacement plate 25 can simultaneously seal the main flow pipes 5 at the top and bottom of the processing cavity 7. At the same time, when the processing cavity 7 presses the contact plate 16 to move until it is in contact with the inner wall of the contact plate 16, the processing cavity 7 can also achieve the same effect. At this time, branch pipe 4 can be inserted into the outer ring of conduit 35. Through the obstruction of conduit 35, sealing plate 10 can be displaced away from the end of guide pipe 41, so that connecting hole 37 can be misaligned with guide pipe 41. In addition, branch pipe 4 can also contact photoelectric sensor 20. Through photoelectric sensor 20, there is an electrical connection with gas valve 36, which can be activated to operate gas valve 36. Through gas valve 36 below support frame 19 as hot gas delivery end, conduit 35 below processing chamber 7 can deliver hot gas into the interior of branch pipe 4. Because the diameter of sealing plate 10 is smaller than the inner diameter of branch pipe 4, hot gas can enter the interior of processing chamber 7 through branch pipe 4. When hot gas passes through molecular sieve inside processing chamber 7, it can remove moisture and carbon dioxide from molecular sieve. At the same time...The air valve 36 above the support frame 19 is a negative pressure absorption end, allowing the conduit 35 on the support frame 19 to absorb the gas inside the processing chamber 7. This accelerates the passage of hot gas through the molecular sieve, improving the activation efficiency of the molecular sieve. When the processing chamber 7 in use needs to be moved to the activation area, the first hydraulic cylinder 3 can be opened again. The piston rod inside the first hydraulic cylinder 3 is connected to the connecting base frame 6, allowing the piston rod inside the first hydraulic cylinder 3 to move both processing chambers 7 simultaneously when it extends or retracts. At this time, when one processing chamber 7 is in the working position, the other processing chamber 7 can be in the activation area. By repeatedly opening the first hydraulic cylinder 3 to move the processing chamber 7 back to the retracted position, the processing chamber 7 can be quickly switched to connect with the precooling unit and heat exchanger. When the processing chamber 7 moves to the point of separation from the contact disc 16, the elasticity of the second spring 26 will drive the second rack. The second rack 28 moves downward, allowing the first displacement plate 22 to separate from the main flow pipe 5 at the bottom of the processing chamber 7. When the second rack 28 moves downward, it can drive the extension rod 33 upward via the first gear 30, allowing the second displacement plate 25 to separate from the main flow pipe 5 at the top of the processing chamber 7. Furthermore, when the first gear 30 rotates in the reverse direction, it can drive the first rack 14 towards the end closer to the positioning side frame 17 via the second gear 31, allowing the contact plate 16 to move and reset, facilitating its re-contact with the processing chamber 7. When the processing chamber 7 separates from the contact plate 16, the branch pipe 4 can detach from the conduit 35. At this time, the sealing plate 10 loses the pressure of the conduit 35, and the elasticity of the first spring 9 will cause the sealing plate 10 to reset, thus sealing the guide pipe 41 and preventing gas leakage from the branch pipe 4 during operation of the processing chamber 7, completing the operation.

[0047] Example 2

[0048] Based on Example 1, such as Figure 10 As shown, the positioning frame 23 also includes a second hydraulic cylinder 38, a support top frame 39, and an alignment sleeve 40. The support top frame 39 is fixedly installed at the top center of the positioning frame 23, the second hydraulic cylinder 38 is fixedly installed at the bottom end of the support top frame 39, and the alignment sleeve 40 is fixedly installed at the bottom center of the second hydraulic cylinder 38.

[0049] In this embodiment, when the second hydraulic cylinder 38 is opened, the alignment sleeve 40 can be moved downward and the alignment sleeve 40 is vertically aligned with the main flow pipe 5 in the working position. Thus, the alignment sleeve 40 can quickly dock with the main flow pipe 5. At the same time, connecting pipes are fixedly installed at both ends of the alignment sleeve 40 and are interconnected with the alignment sleeve 40, so that the processed air can be delivered from the alignment sleeve 40 to the interior of the main flow pipe 5, completing the work of quickly docking the alignment sleeve 40 with the main flow pipe 5.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-purity nitrogen cryogenic nitrogen generation device, comprising a support component (2), wherein a displacement device (1) is fixedly installed at the bottom end of the support component (2), and first hydraulic cylinders (3) are fixedly installed at the top ends of both sides of the support component (2), characterized in that: The support component (2) is used to support the overall sliding displacement of the displacement device (1), and when the displacement device (1) is displaced to the limit position, the branch pipe (4) and the conduit (35) are interconnected, and at the same time, the air valve (36) is opened to transport air. The displacement device (1) is used for displacement docking. The first spring (9) drives the sealing plate (10) to close the guide pipe (41), and the processing cavity (7) works normally inside to carry out displacement control work.

2. The high-purity nitrogen cryogenic nitrogen generation device according to claim 1, characterized in that: The displacement device (1) includes a branch pipe (4), a main pipe (5), a processing chamber (7), a pressure relief valve (8), and a guide pipe (41).

3. The high-purity nitrogen cryogenic nitrogen generation device according to claim 2, characterized in that: The branch pipe (4) is fixedly installed on the side end of the main pipe (5). The main pipe (5) is fixedly installed at the top and bottom center of the processing chamber (7). The pressure relief valve (8) is fixedly installed at the bottom side end of the processing chamber (7). A connecting base frame (6) is symmetrically fixedly installed between the two processing chambers (7).

4. The high-purity nitrogen cryogenic nitrogen generation device according to claim 3, characterized in that: A first spring (9) is fixedly installed at one end of the branch pipe (4) away from the processing cavity (7), and the first spring (9) is arranged in a ring. A sealing plate (10) is fixedly installed at one end of the first spring (9) near the processing cavity (7). The guide pipe (41) is fixedly installed at the center of the branch pipe (4) away from the sealing plate (10).

5. The high-purity nitrogen cryogenic nitrogen generation device according to claim 1, characterized in that: The supporting component (2) includes a contact device (11), a positioning device (12) and a connecting device (13). The contact device (11) is fixedly installed at both ends inside the positioning device (12). The connecting device (13) is symmetrically fixedly installed at both ends inside the positioning device (12), and the connecting device (13) is located at the upper and lower ends of the contact device (11).

6. The high-purity nitrogen cryogenic nitrogen generation device according to claim 5, characterized in that: The contact device (11) includes a positioning side frame (17) and a contact circular plate (16). A support slide (15) is slidably inserted into the center of the positioning side frame (17). The contact circular plate (16) is symmetrically fixedly installed on the side end of the support slide (15). A first rack (14) is fixedly installed on the side end of the support slide (15) away from the contact circular plate (16).

7. A high-purity nitrogen cryogenic nitrogen generation device according to claim 6, characterized in that: When the contact plate (16) is squeezed, the support slide (15) can drive the first rack (14) to move back to its original position.

8. A high-purity nitrogen cryogenic nitrogen generation device according to claim 5, characterized in that: The positioning device (12) includes a positioning frame (23), a support frame (19), and a guide rod (18).

9. A high-purity nitrogen cryogenic nitrogen generation device according to claim 5, characterized in that: The connecting device (13) includes a conduit (35), a connecting hole (37) is provided on the outer ring of one end of the conduit (35), and the connecting hole (37) is distributed in a ring. An air valve (36) is fixedly installed on the end of the conduit (35) away from the connecting hole (37). The conduit (35) is connected to the branch pipe (4), and the connecting hole (37) can release gas into the interior of the branch pipe (4).

10. A method for preparing a high-purity nitrogen cryogenic nitrogen generator, comprising the high-purity nitrogen cryogenic nitrogen generator described in claim 9, characterized in that, It includes the following steps: S1. Air compression: Ambient air is compressed to 0.6-1.0 MPa by an air compressor after passing through a filter to remove dust and other mechanical impurities; S2, Purification: Compressed air first enters the pre-cooling unit and is cooled by cooling water to reduce the temperature. Then it enters the processing chamber (7). The processing chamber (7) is equipped with a molecular sieve. When the compressed air passes through the molecular sieve, it can adsorb and remove impurities such as moisture, carbon dioxide, and hydrocarbons in the air. S3, Cooling and Liquefaction: The purified high-pressure air enters the main heat exchanger through the processing chamber (7) and the heat exchanger. It undergoes countercurrent heat exchange with the low-temperature product nitrogen and waste gas of the distillation column. The high-pressure air is cooled to near the liquefaction temperature by the returning low-temperature gas, while the returning gas is reheated to near the ambient temperature. Some of the deeply cooled air is expanded by the expander, and the pressure and temperature drop sharply, so most of the air will liquefy and provide the required cooling capacity for the system. S4. Distillation Separation: After liquefaction and cooling, the air enters the distillation column system. The air is initially separated. The oxygen with a higher boiling point is enriched at the bottom of the column to form oxygen-enriched liquid air, while the nitrogen with a lower boiling point is enriched at the top of the column to obtain impure liquid nitrogen. The oxygen-enriched liquid air and liquid nitrogen from the lower column are sent to the appropriate position in the upper column for more refined separation. Liquid oxygen flows out from the bottom of the upper column, while high-purity gaseous nitrogen is drawn out from the top of the upper column. S5. Finally, the high-purity nitrogen product is output from the top of the column, reheated by a heat exchanger, and then sent out. The by-products oxygen and argon can also be collected separately as needed.

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