A nitrogen recovery conduit system

Abstract

The application discloses a nitrogen recovery pipeline system, which comprises a first pipeline group connecting a nitrogen making machine and a nitrogen compressor system one, a gas inlet pipeline group connecting the nitrogen compressor system one and a foaming kettle group one, a gas outlet pipeline group connecting the foaming kettle group one and a nitrogen recovery tank group, and a circulation pipeline group connecting the nitrogen recovery tank group and a nitrogen compressor system three. The system adopts the mode that nitrogen is first introduced into the foaming kettle group one, and then, after the foaming kettle group one is foamed and the nitrogen is discharged into the nitrogen recovery tank group, the nitrogen recovery tank group charges the nitrogen into the foaming kettle group two and the foaming kettle group three through the nitrogen compressor system. After multiple cycles, the three foaming kettle groups can normally perform the foaming process, all the nitrogen is not charged into the corresponding foaming kettle at one time, the single working pressure of the equipment is reduced, the equipment cost and the operation cost are reduced, and the system can be widely used.

Description

Technical Field

[0001] This invention relates to the field of nitrogen recovery, and more particularly to a nitrogen recovery pipeline system. Background Technology

[0002] The thermoplastic elastomer foaming process specifically involves introducing a large amount of high-pressure nitrogen into a foaming vessel containing thermoplastic elastomer material. After a period of high pressure, the nitrogen is rapidly released, allowing the thermoplastic elastomer inside the vessel to foam. After foaming, the nitrogen inside the vessel must be vented. Existing technologies require the introduction of fresh nitrogen each time a new foaming process is performed, and the vented nitrogen is not recycled, resulting in resource waste. Not only is nitrogen wasted, but the process of introducing nitrogen into the foaming vessel also consumes significant equipment and electricity. To address these issues, a nitrogen recovery process has been proposed, involving the addition of a nitrogen recovery tank to recover and recycle the vented nitrogen, achieving energy conservation and environmental protection. However, a problem remains in the foaming process: existing technologies use nitrogen pressurization equipment to inject nitrogen into all foaming vessels at once. This requires a large amount of energy from the nitrogen pressurization equipment to fill all foaming vessels, resulting in significant costs and low nitrogen injection efficiency. The existing publication CN105418957A discloses a thermoplastic granule foaming device and its foaming process. This thermoplastic granule foaming device includes: at least one infiltration vessel, which has a cavity for storing thermoplastic granules. The infiltration vessel is used to infiltrate supercritical CO2 into the thermoplastic granules and discharge the supercritically infiltrated thermoplastic granules; a foaming chamber, which contains a foaming mechanism and a soft screen for conveying the thermoplastic granules. The soft screen has a foaming inlet and a foaming outlet. The foaming inlet receives the thermoplastic granules discharged from the infiltration vessel, the foaming mechanism continuously heats and foams the thermoplastic granules on the soft screen, and the foaming outlet discharges the foamed thermoplastic granules into the foaming chamber; and a variable frequency motor connected to the soft screen and used to adjust the conveying speed of the soft screen. This thermoplastic granule foaming device has the advantages of good foaming effect and high production efficiency. However, it still does not solve the problems mentioned above. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a nitrogen recovery pipeline system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a nitrogen generator, a nitrogen compressor system, and a nitrogen recovery tank group connected to foaming kettle group one, foaming kettle group two, and foaming kettle group three.

[0005] The nitrogen generator is connected to the nitrogen compressor system through a first pipeline group, and the nitrogen compressor system is connected to the foaming kettle group through an air inlet pipeline group, which is used to transport the generated nitrogen to the foaming kettle group to achieve foaming of the internal materials.

[0006] The first foaming kettle group is connected to the nitrogen recovery tank group through an exhaust pipe group. After foaming, the nitrogen inside the first foaming kettle group is discharged to the nitrogen recovery tank group for recovery. Under normal working conditions, the nitrogen in the nitrogen recovery tank group enters the second nitrogen compressor system through the circulation pipe group for repressurization and then enters the second foaming kettle group for foaming. The circulation pipe group is also connected to the third nitrogen compressor system for pressurizing and transporting nitrogen to the third foaming kettle group for foaming.

[0007] As a further description of the above technical solution, the first foaming kettle group, the second foaming kettle group, and the third foaming kettle group are all connected to the nitrogen recovery tank group through the exhaust pipe group, and the exhaust pipe is equipped with a solenoid valve for controlling the opening and closing.

[0008] As a further description of the above technical solution, the end of the circulating pipeline group is connected to the vulcanizing tank group.

[0009] As a further description of the above technical solution, the first foaming kettle group, the second foaming kettle group, and the third foaming kettle group are all connected to the exhaust pipe group through exhaust branch pipes, and the exhaust branch pipes are equipped with solenoid valves.

[0010] As a further description of the above technical solution, it also includes a nitrogen storage tank, which is connected to the air inlet pipeline group through a regulating valve. The nitrogen storage tank is also connected to the air inlet pipeline group through a three-way pipe, and solenoid valves are respectively installed at both ends of the three-way pipe connected to the air inlet pipeline.

[0011] As a further description of the above technical solution, the foaming kettle assembly includes multiple air intake methods.

[0012] As a further description of the above technical solution, the air intake method of the foaming kettle assembly one includes:

[0013] In the first air intake method, the regulating valve of the nitrogen storage tank is closed, and the two sets of solenoid valves of the three-way pipe are open;

[0014] In the second air intake method, the solenoid valve of the three-way pipe leading to the nitrogen compressor system is closed, and the regulating valve of the three-way pipe and another solenoid valve are open.

[0015] As a further description of the above technical solution, the first foaming kettle group, the second foaming kettle group, the third foaming kettle group, and the vulcanizing tank group are all connected to the silencer group through pipelines. The silencer group is used to eliminate the noise when the residue is discharged in the corresponding kettle body.

[0016] As a further description of the above technical solution, the first foaming kettle group includes four foaming kettles, the second foaming kettle group includes four foaming kettles, and the third foaming kettle group includes two foaming kettles.

[0017] As a further description of the above technical solution, the nitrogen recovery tank group includes six nitrogen recovery tanks, and the volume of each nitrogen recovery tank is 100m³.

[0018] The present invention has the following beneficial effects:

[0019] 1. The present invention uses a nitrogen introduction method where nitrogen is first introduced into foaming kettle group one. After foaming is completed in foaming kettle group one and the nitrogen is discharged to the nitrogen recovery tank group, the nitrogen recovery tank group then fills the nitrogen into foaming kettle group two and foaming kettle group three through the nitrogen compressor system. After multiple cycles, all three foaming kettle groups can carry out the foaming process normally. Instead of filling all the nitrogen into the corresponding foaming kettle at one time, the single working pressure of the equipment is reduced, which can reduce equipment costs and operating costs, and can be widely promoted and used. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the nitrogen recovery pipeline system in this invention.

[0021] Legend:

[0022] 1. Foaming kettle group one; 2. Foaming kettle group two; 3. Foaming kettle group three; 4. Nitrogen generator equipment; 51. Nitrogen compressor system one; 52. Nitrogen compressor system two; 53. Nitrogen compressor system three; 6. First pipeline group; 7. Inlet pipeline group; 8. Circulation pipeline group; 9. Exhaust pipeline group; 10. Vulcanizing tank group; 11. Solenoid valve; 12. Exhaust branch pipeline; 13. Nitrogen storage tank; 14. T-junction pipeline; 15. Regulating valve; 16. Silencer group; 17. Nitrogen recovery tank group. Detailed Implementation

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

[0024] This application provides a nitrogen recovery pipeline system, which solves the problem that existing foaming kettle systems require multiple nitrogen generators and nitrogen compressors to be filled with nitrogen all at once, or a single nitrogen generator and nitrogen compressor requires high power operation. After long-term use, this can easily lead to damage to the nitrogen supply equipment and increase the overall process cost. In order to solve the problem of high equipment power consumption or cost caused by filling nitrogen with nitrogen all at once, existing systems often use a single nitrogen supply device connected to multiple delivery pipelines to be connected to the foaming kettles respectively, so that nitrogen can be introduced into each foaming kettle in sequence. However, in actual use, the nitrogen pressure of each foaming kettle has a uniform standard. When filling nitrogen into a large number of foaming kettles in sequence, it takes a long time, which will prolong the entire foaming process. The technical concept of this application is to use a nitrogen recovery tank group as a transition unit. Nitrogen is first introduced into the first foaming kettle group and the nitrogen recovery tank through a nitrogen supply device. While the reaction is taking place in the first foaming kettle group, the nitrogen recovery tank sequentially supplies nitrogen to the second and third foaming kettle groups. This eliminates the need for multiple nitrogen supply devices or nitrogen compressors to supply nitrogen simultaneously or a single nitrogen supply device to supply nitrogen at its rated power, which greatly saves equipment costs and reduces wear and tear on the nitrogen supply equipment. At the same time, while the first foaming kettle group is foaming, the nitrogen recovery tank can sequentially supply nitrogen to the second and third foaming kettle groups, saving the overall process time.

[0025] Reference Figure 1 An embodiment of the present invention provides a nitrogen recovery pipeline system, including a nitrogen generator 4 connected to a foaming kettle group 1, a foaming kettle group 2, and a foaming kettle group 3. The nitrogen compressor system includes a nitrogen compressor system 1 51, a nitrogen compressor system 2 52, and a nitrogen compressor system 3 53. Each nitrogen compressor system includes multiple nitrogen compressor devices. The nitrogen can be pressurized by the nitrogen compressor devices to achieve the foaming standard.

[0026] When nitrogen is first introduced, the nitrogen generator 4 is connected to the nitrogen compressor system 51 through the first pipeline group 6. The nitrogen generator 4 delivers the nitrogen produced to the nitrogen compressor system 51 through the first pipeline group 6 to pressurize the nitrogen. The nitrogen compressor system 51 is connected to the foaming kettle group 1 through the air inlet pipeline group 7 to deliver the nitrogen produced to the foaming kettle group 1 to achieve the foaming of the thermoplastic material inside.

[0027] After foaming is complete, the foaming kettle group 1 and the nitrogen recovery tank group are connected through the exhaust pipe group 9. After foaming, the nitrogen inside the foaming kettle group 1 is discharged to the nitrogen recovery tank group for recovery. Under normal operating conditions, the nitrogen in the nitrogen recovery tank group enters the nitrogen compressor system 2 52 through the circulation pipe group 8 for repressurization, and then enters the foaming kettle group 2 for foaming. The circulation pipe group 8 is also connected to the nitrogen compressor system 3 53 to pressurize and transport the nitrogen to the foaming kettle group 3 3 for foaming. Both the foaming kettle group 2 and the foaming kettle group 3 3 are connected to the nitrogen recovery tank again through the exhaust pipe group 9 to realize the circulation of nitrogen. The nitrogen is introduced first into the foaming kettle group 1 and the nitrogen recovery tank. Group 17, while foaming in foaming kettle group 1, nitrogen recovery tank group 17 then fills the foaming kettle group 2 and foaming kettle group 3 with nitrogen through the nitrogen compressor system. After multiple cycles, all three foaming kettles can carry out the foaming process normally. Instead of filling all the nitrogen into the corresponding foaming kettle at one time, it reduces the single working pressure of the nitrogen supply equipment (nitrogen generator 4 and nitrogen compressor system). When there are many foaming kettle groups, it can reduce the operating cost of the equipment to a certain extent. When a single or a few nitrogen supply devices supply nitrogen to multiple foaming kettles, it can also reduce the high-power operation time of the nitrogen supply equipment, effectively reduce the damage to the nitrogen supply equipment, and extend the service life of the nitrogen supply equipment. This also reduces the investment of hidden costs and can be widely promoted and used.

[0028] Foaming kettle group 1, foaming kettle group 2 and foaming kettle group 3 are all connected to the nitrogen recovery tank group through exhaust pipe group 9, and the exhaust pipe is equipped with a solenoid valve 11 for controlling the opening and closing. The exhaust pipe group 9 is a whole exhaust pipe.

[0029] The end of the circulating pipeline group 8 is connected to the vulcanizing tank group 10, which is used to introduce the remaining gas into the vulcanizing tank group 10 for reaction. The foaming kettle group 1, foaming kettle group 2, foaming kettle group 3 and vulcanizing tank group 10 are all connected to the silencer group 16 through pipelines. The silencer group 16 is used to eliminate the noise when the residue is discharged in the corresponding kettle body, reduce the noise during the entire process reaction, and reduce the impact on the working environment.

[0030] Furthermore, in this embodiment, foaming vessel group 1 includes four foaming vessels, foaming vessel group 2 includes four foaming vessels, foaming vessel group 3 includes two foaming vessels, and nitrogen recovery tank group includes six nitrogen recovery tanks. The volume of a single nitrogen recovery tank is 100m³. In other feasible embodiments, the number of foaming vessels and the volume of nitrogen recovery tanks can be adjusted according to actual needs.

[0031] Furthermore, in this embodiment, the foaming vessel assembly 1 includes multiple air intake methods, specifically including:

[0032] In the first air intake method, the regulating valve 15 of the nitrogen storage tank 13 is closed, and the two sets of solenoid valves 11 of the three-way pipe 14 are opened. At this time, nitrogen is injected into the air intake pipe group 7 through the nitrogen compressor system 51 via the nitrogen generator 4, thereby supplying nitrogen into the foaming kettle group 1.

[0033] In the second air intake method, the solenoid valve 11 of the three-way pipe 14 leading to the nitrogen compressor system 51 is closed, while the regulating valve 15 of the three-way pipe 14 and another solenoid valve 11 are open. In this method, nitrogen is introduced into the foaming kettle assembly 1 through the nitrogen storage tank 13. Different methods can be used according to actual needs.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nitrogen recovery pipeline system, characterized in that: Includes a nitrogen generator (4) connected to foaming reactor group 1 (1), foaming reactor group 2 (2) and foaming reactor group 3 (3), a nitrogen compressor system and a nitrogen recovery tank group (17). The nitrogen generator (4) is connected to the nitrogen compressor system (51) through the first pipeline group (6), and the nitrogen compressor system (51) is connected to the foaming kettle group (1) through the air inlet pipeline group (7) to transport the generated nitrogen to the foaming kettle group (1) to achieve foaming of the internal materials. The foaming kettle group 1 (1) is connected to the nitrogen recovery tank group (17) through the exhaust pipe group (9), which is used to discharge the nitrogen inside the foaming kettle group 1 (1) to the nitrogen recovery tank group (17) for recovery after foaming. Under normal working conditions, the nitrogen in the nitrogen recovery tank group (17) enters the nitrogen compressor system 2 (52) through the circulation pipe group (8) for repressurization, and then enters the foaming kettle group 2 (2) for foaming. The circulation pipe group (8) is also connected to the nitrogen compressor system 3 (53) for pressurizing and transporting nitrogen to the foaming kettle group 3 (3) for foaming. While the first foaming kettle group (1) is foaming, the nitrogen recovery tank group (17) then fills the second foaming kettle group (2) and the third foaming kettle group (3) with nitrogen through the nitrogen compressor system. After multiple cycles, all three foaming kettles can carry out the foaming process normally, instead of filling all the nitrogen into the corresponding foaming kettle at one time, thus reducing the single working pressure of the nitrogen generator equipment (4) and the nitrogen compressor system.

2. The nitrogen recovery pipeline system according to claim 1, characterized in that: The first foaming vessel group (1), the second foaming vessel group (2), and the third foaming vessel group (3) are all connected to the nitrogen recovery tank group (17) through the exhaust pipe group (9), and the exhaust pipe is equipped with a solenoid valve (11) for controlling the opening and closing.

3. The nitrogen recovery pipeline system according to claim 1, characterized in that: The end of the circulating pipeline group (8) is connected to the vulcanizing tank group (10).

4. The nitrogen recovery pipeline system according to claim 1, characterized in that: The first foaming vessel group (1), the second foaming vessel group (2), and the third foaming vessel group (3) are all connected to the exhaust pipe group (9) through an exhaust branch pipe (12), and the exhaust branch pipe (12) is equipped with a solenoid valve (11).

5. The nitrogen recovery pipeline system according to claim 1, characterized in that: It also includes a nitrogen storage tank (13), which is connected to the air intake pipe group (7) through a regulating valve (15). The nitrogen storage tank (13) is connected to the air intake pipe group (7) through a three-way pipe (14), and solenoid valves (11) are respectively installed at both ends of the three-way pipe (14) connected to the air intake pipe.

6. The nitrogen recovery pipeline system according to claim 5, characterized in that: The foaming kettle assembly (1) includes multiple air intake methods.

7. The nitrogen recovery pipeline system according to claim 6, characterized in that: The air intake method of the foaming kettle assembly (1) includes: In the first air intake method, the regulating valve (15) of the nitrogen storage tank (13) is closed, and the two sets of solenoid valves (11) of the three-way pipe (14) are open; In the second intake mode, the solenoid valve (11) of the three-way pipe (14) leading to the nitrogen compressor system (51) is closed, and the regulating valve (15) of the three-way pipe (14) and another solenoid valve (11) are open.

8. The nitrogen recovery pipeline system according to claim 3, characterized in that: The foaming kettle group one (1), the foaming kettle group two (2), the foaming kettle group three (3) and the vulcanizing tank group (10) are all connected to the silencer group (16) through pipes. The silencer group (16) is used to eliminate the noise when the residue is discharged in the corresponding kettle body.

9. The nitrogen recovery pipeline system according to claim 1, characterized in that: The first foaming vessel group (1) includes four foaming vessels, the second foaming vessel group (2) includes four foaming vessels, and the third foaming vessel group (3) includes two foaming vessels.

10. The nitrogen recovery pipeline system according to claim 1, characterized in that: The nitrogen recovery tank group (17) includes six nitrogen recovery tanks, each with a volume of 100 m³.

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