A nitrogen regeneration system

Abstract

The utility model provides a kind of nitrogen regeneration system, including heat exchanger, cooler, separator and heater, the input port is connected to the A port of heat exchanger, the inlet of cooler is connected to the B port of heat exchanger, the inlet of heater is connected to the C port of heat exchanger, the D port of heat exchanger is connected with the air supplementing mouth by first pipeline, first channel is equipped with first solenoid valve;The inlet of separator is connected to the outlet of cooler, the D port of heat exchanger is connected to the gas phase outlet of separator by second pipeline, second pipeline is successively connected with second solenoid valve, filter, circulating fan and third solenoid valve, safety torch is connected between gas component sensor and circulating fan by third pipeline, fourth solenoid valve is equipped on third pipeline;The output port is connected to the outlet of heater by fourth pipeline, temperature sensor is equipped on fourth pipeline.Compared with prior art, the utility model has the advantages of low energy consumption, easy operation and high degree of intelligence.

Description

Technical Field

[0001] This utility model relates to the technical field of nitrogen regeneration, and in particular to a nitrogen regeneration system. Background Technology

[0002] In the fields of chemical engineering, air separation, and natural gas processing, the regeneration process of adsorption towers requires the continuous introduction of high-temperature dry nitrogen to remove moisture or impurities from the adsorbent. Currently, after the high-temperature dry nitrogen is used in the adsorption tower, it is usually recycled and reused in the regeneration system. However, existing regeneration systems typically have the following problems: First, the modes are relatively simple. Individual systems usually only have closed-loop or open-loop modes. Long-term operation in closed-loop mode can easily cause pollutants to accumulate in the circulating gas, affecting the regeneration effect and potentially leading to adsorbent poisoning. Open-loop mode requires continuous consumption of high-purity nitrogen, and the direct emission of high-temperature nitrogen causes energy waste and thermal pollution. Second, the energy utilization rate is low. High-temperature nitrogen is generally simply water-cooled and then directly discharged after passing through the regeneration system, resulting in significant energy waste. Third, the level of automation is low. The opening and closing of valves, the operation of various components, and the monitoring of instruments all rely on manual operation. Manual operation poses safety hazards, is prone to errors, and also affects the safety and stability of the system. Therefore, it is urgent to solve the above problems. Utility Model Content

[0003] To address the aforementioned problems, this utility model achieves the above objectives through the following technical solution: a nitrogen regeneration system, comprising a heat exchanger, a cooler, a separator, and a heater, wherein the A port of the heat exchanger is connected to an inlet, the B port of the heat exchanger is connected to the inlet of the cooler, the C port of the heat exchanger is connected to the inlet of the heater, and the D port of the heat exchanger is connected to a gas replenishment port through a first pipe, and a first solenoid valve is provided on the first channel; The outlet of the cooler is connected to the inlet of the separator. The gas phase outlet of the separator is connected to the D port of the heat exchanger through a second pipe. A second solenoid valve, a filter, a circulating fan and a third solenoid valve are connected in series on the second pipe. A gas composition sensor is provided between the filter and the circulating fan. A pressure sensor is provided between the circulating fan and the third solenoid valve. A safety torch is connected between the gas composition sensor and the circulating fan through a third pipe. A fourth solenoid valve is provided on the third pipe. The heater outlet is connected to an output port via a fourth pipe, and a temperature sensor is installed on the fourth pipe.

[0004] Furthermore, the gas phase outlet of the separator is connected between the outlet of the circulating fan and the inlet of the third solenoid valve via a fifth pipe, and a fifth solenoid valve is provided on the fifth pipe; a seventh solenoid valve is provided on the second pipe, between the third solenoid valve and the pressure sensor; by opening and closing the fifth solenoid valve, the flow direction of the fluid is changed, which facilitates the maintenance of the circulating fan and the filter.

[0005] Furthermore, the gas phase outlet of the separator is connected to the safety flare via a sixth pipe, which is equipped with a sixth solenoid valve; this allows for safe discharge of fluid, reducing pollutants and making the process more environmentally friendly.

[0006] Furthermore, the liquid outlet of the separator is connected to a drain valve, and the separator is equipped with a liquid level sensor, which is electrically connected to the drain valve; this enables automatic discharge of the separated water without manual operation, reducing labor intensity.

[0007] Furthermore, it also includes a controller, in which each of the solenoid valves, each of the sensors, the heater, and the circulating fan are electrically connected to the controller; under the feedback of each sensor, it can realize intelligent control of each valve, thereby automatically switching modes, with a high degree of intelligence, and without relying on manual operation, eliminating safety hazards, avoiding human operation errors, and effectively ensuring the safety and stability of the system.

[0008] Furthermore, the heat exchanger has a finned tube or shell-and-tube structure to ensure contact area, improve heat exchange efficiency, and reduce energy waste.

[0009] Furthermore, the separator is equipped with a cyclone separation unit and a demister. The demister is a corrugated plate or fiber bed structure, which can effectively remove water from the fluid and ensure that the droplet removal efficiency is not less than 99.5%.

[0010] Furthermore, the circulating fan is a frequency converter, which can work with the feedback from the pressure sensor to adjust the air volume of the circulating fan in real time, thereby adapting to the pressure requirements of different modes.

[0011] Compared with existing technologies, the beneficial effects of this invention are as follows: First, this system has the ability to operate in both open-loop and closed-loop modes. In closed-loop mode, it can achieve closed-loop regeneration, significantly reducing gas consumption and emissions. In open-loop mode, it can completely avoid the risk of pollutant accumulation. The two modes operate collaboratively through the same system, ensuring environmental benefits while meeting the reliability requirements of differentiated processes. Second, in closed-loop mode, high-temperature waste gas can be forcibly used to preheat the regeneration fluid, significantly reducing downstream heating energy consumption. In open-loop mode, the sensible heat of the waste gas is transferred to the freshly replenished nitrogen, maximizing energy utilization and reducing energy waste. Third, the controller enables fully automated operation of the entire process, automatically completing mode switching, valve linkage, equipment start-up and shutdown, and parameter adjustment, completely eliminating the risk of human error. At the same time, it optimizes heat recovery efficiency in real time and combines multiple safety interlocking mechanisms to ensure stable system operation, significantly reducing operational complexity and maintenance costs, thereby solving the technical problems in existing technologies. Overall, this invention has the advantages of low energy consumption, convenient operation, and high level of intelligence, effectively avoiding energy waste and realizing the utilization of cascaded energy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the system connection of this utility model.

[0013] The reference numerals in the attached diagram are explained as follows: 1-Heat exchanger; 2-Cooler; 3-Separator; 4-Heater; 5-Inlet; 6-First pipe; 7-Maintenance port; 8-First solenoid valve; 9-Second pipe; 10-Second solenoid valve; 11-Filter; 12-Circulating fan; 13-Third solenoid valve; 14-Gas composition sensor; 15-Pressure sensor; 16-Third pipe; 17-Safety flare; 18-Fourth solenoid valve; 19-Fourth pipe; 20-Outlet; 21-Temperature sensor; 22-Fifth pipe; 23-Fifth solenoid valve; 24-Sixth pipe; 25-Sixth solenoid valve; 26-Drain valve; 27-Level sensor; 28-Seventh solenoid valve. Detailed Implementation

[0014] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only.

[0015] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0016] like Figure 1 As shown, this utility model provides a nitrogen regeneration system, including a heat exchanger 1, a cooler 2, a separator 3 and a heater 4. The A port of the heat exchanger 1 is connected to an inlet 5, the B port of the heat exchanger 1 is connected to the inlet of the cooler 2, the C port of the heat exchanger 1 is connected to the inlet of the heater 4, and the D port of the heat exchanger 1 is connected to a gas supply port 7 through a first pipe 6. A first solenoid valve 8 is provided on the first pipe 6. The outlet of cooler 2 is connected to the inlet of separator 3. The gas phase outlet of separator 3 is connected to port D of heat exchanger 1 through second pipe 9. Second solenoid valve 10, filter 11, circulating fan 12 and third solenoid valve 13 are connected in series on second pipe 9. Gas composition sensor 14 is provided between filter 11 and circulating fan 12. Pressure sensor 15 is provided between circulating fan 12 and third solenoid valve 13. Safety torch 17 is connected between gas composition sensor 14 and circulating fan 12 through third pipe 16. Fourth solenoid valve 18 is provided on third pipe 16. The outlet of heater 4 is connected to an output port 20 through a fourth pipe 19, and a temperature sensor 21 is installed on the fourth pipe 19.

[0017] The gas phase outlet of separator 3 is connected to the outlet of circulating fan 12 and the inlet of third solenoid valve 13 via fifth pipe 22. Fifth solenoid valve 23 is installed on fifth pipe 22. A seventh solenoid valve 28 is installed on second pipe 9, between third solenoid valve 13 and pressure sensor 15. The gas phase outlet of separator 3 is connected to safety flare 17 via sixth pipe 24. Sixth solenoid valve 25 is installed on sixth pipe 24. The liquid phase outlet of separator 3 is connected to drain valve 26. Liquid level sensor 27 is installed on separator 3 and is electrically connected to drain valve 26.

[0018] This system also includes a controller, with each solenoid valve, sensor, heater 4, and circulating fan 12 electrically connected to the controller. The controller can be a PLC controller with a remote communication interface, enabling remote communication with the factory's central control system. This allows for remote monitoring and fault diagnosis, effectively improving the level of intelligence and making maintenance more convenient and intelligent. Each sensor provides real-time feedback to the controller, which then adjusts the corresponding solenoid valves and equipment based on the feedback information to ensure that the purity, pressure, and temperature of the output gas meet the requirements. A temperature sensor 21 is connected to the outlet of cooler 2. By feeding the temperature information back to the controller, the controller adjusts the opening of the cold source solenoid valve of cooler 2, thereby changing the heat exchange efficiency and effectively ensuring that the outlet temperature of cooler 2 remains stable between 2-10℃, ensuring efficient condensation and dehydration. Cooler 2 adopts a multi-stage condensation design, with built-in high-efficiency heat exchange tube bundles and a temperature regulating valve to achieve precise control of the outlet gas temperature.

[0019] The heater 4 preferably adopts an electric heating or gas heating structure, and has a built-in multi-segment heating unit and PID temperature controller, which can effectively ensure heating efficiency and stably control the temperature of the output port 20. It can work with the temperature sensor 21 to provide feedback to the controller, which determines whether the gas output temperature meets the requirements, and then adjusts the power of the heater 4 in real time to ensure that the gas output temperature meets the requirements.

[0020] The filter 11 preferably includes a two-stage filtration unit consisting of coarse filtration and static filtration, which can effectively ensure a filtration accuracy of not less than 0.01μm and effectively remove impurities. It can work with the gas composition sensor 14 to provide feedback to the controller, which determines whether the gas composition meets the requirements (moisture content index, pollutant content index, etc.), and then adjusts the second pipe 9 in real time to ensure its continuity, and also automatically switches the working mode.

[0021] Heat exchanger 1 is a finned tube or shell-and-tube structure, preferably made of stainless steel or nickel-based alloy to improve corrosion resistance and heat transfer efficiency. Separator 3 contains a cyclone separator and a demister. The demister is a corrugated plate or fiber bed structure, effectively removing moisture from the fluid and ensuring a droplet removal efficiency of no less than 99.5%. It is preferably equipped with a coalescing filter element to ensure that the water content of the separated gas is below 50 mg / Nm³. Circulating fan 12 is a variable frequency drive, capable of feeding feedback to the controller in conjunction with pressure sensor 15. The controller determines whether the pressure meets the requirements and then adjusts the airflow of circulating fan 12 in real time to adapt to the pressure demands of different modes.

[0022] The specific working principle of this utility model is as follows: In closed-loop mode, the first solenoid valve 8, the fourth solenoid valve 18, the fifth solenoid valve 23, and the sixth solenoid valve 25 remain closed, while the second solenoid valve 10, the third solenoid valve 13, and the seventh solenoid valve 28 remain open. The inlet 5 and the outlet 20 are connected to the outlet and inlet of the adsorption tower, respectively. The high-temperature nitrogen gas flowing out of the adsorption tower passes through the inlet 5 and enters the heat exchanger 1 from port A as a heat exchange energy source. It then flows from port B of the heat exchanger 1 into the cooler 2. After being cooled by the cooler 2, it flows into the separator 3. After separation by the separator 3, the liquid phase remains in the separator 3. When the liquid level sensor 27 detects that the water level has reached the upper limit value... The controller will open the drain valve 26 to discharge the separated water, and the gas phase will flow from the gas phase outlet to the second pipe 9. The fluid passes through the second solenoid valve 10, filter 11, gas composition sensor 14, circulating fan 12, pressure sensor 15, seventh solenoid valve 28 and third solenoid valve 13 in sequence. After being filtered and impurity removed, the fluid returns to the heat exchanger 1. At this time, it is introduced from the D port of the heat exchanger 1 as the heat exchange fluid. This allows the high-temperature nitrogen gas flowing out of the adsorption tower to preheat the recovered and regenerated fluid. Then, it flows from the C port of the heat exchanger 1 to the heater 4. The heated fluid flows back into the adsorption tower through the fourth pipe 19 and the outlet 20 to realize the recycling and regeneration of nitrogen gas.

[0023] When the gas composition sensor 14 detects that the pollutant concentration in the circulating nitrogen exceeds the set threshold, the controller switches the system to open-circuit mode. The third solenoid valve 13, the fifth solenoid valve 23, the sixth solenoid valve 25, and the seventh solenoid valve 28 remain closed, while the fourth solenoid valve 18, the second solenoid valve 10, and the first solenoid valve 8 remain open. The inlet 5 and outlet 20 are connected to the outlet and inlet of the adsorption tower, respectively. The high-temperature nitrogen flowing from the outlet of the adsorption tower passes through inlet 5 and, as a heat exchange energy source, enters heat exchanger 1 through port A. It then flows from port B of heat exchanger 1 into cooler 2. After being cooled by cooler 2, it flows into separator 3. After separation by separator 3, the separated gas phase flows from the gas phase outlet to… The fluid passes through the second solenoid valve 10, filter 11, and gas composition sensor 14 in sequence through the second pipe 9, and then enters the third pipe 16. After passing through the fourth solenoid valve 18, it is directly output to the safety flare 17. Meanwhile, fresh nitrogen is introduced through the gas supply port 7. The fresh nitrogen passes through the first pipe 6 and the D end of the heat exchanger 1, and enters the heat exchanger 1. At the same time, the high-temperature nitrogen flowing out of the adsorption tower preheats the fresh nitrogen. Then, it flows from the C port of the heat exchanger 1 to the heater 4. The heated fresh nitrogen flows through the fourth pipe 19 and the output port 20 into the adsorption tower. When the gas composition sensor 14 detects that the pollutant concentration of the circulating nitrogen has dropped to the set threshold, the controller will switch the system back to the closed-loop mode, thereby realizing automatic mode switching.

[0024] It is worth mentioning that, since filter 11 is a consumable, circulating fan 12 is prone to failure under repeated adjustments, thus requiring regular maintenance or replacement of corresponding components in the second pipeline 9. During maintenance, the controller can be activated to start the maintenance mode, keeping the first solenoid valve 8, the second solenoid valve 10, the fourth solenoid valve 18, and the seventh solenoid valve 28 closed, the third solenoid valve 13 open, and selectively opening one of the fifth solenoid valve 23 or the sixth solenoid valve 25. This prevents fluid from passing through the second pipeline 9, allowing for maintenance or replacement of components on the second pipeline 9. The fluid will then flow directly through the fifth pipeline 22 and the third solenoid valve 13 to port D of heat exchanger 1, or directly through the sixth pipeline 24 to the safety flare 17. This allows for simultaneous nitrogen regeneration and maintenance, ensuring the nitrogen regeneration process is not interrupted and continuous operation is maintained to guarantee production efficiency.

[0025] In summary, the technical solution of this utility model can fully and effectively achieve the aforementioned objectives. Furthermore, the structure and functional principles of this utility model have been fully verified in the embodiments, achieving the expected effects and objectives. Without departing from the principles and essence of this utility model, various changes or modifications can be made to the embodiments. Therefore, this utility model includes all substitutions within the scope mentioned in the patent application claims, and any equivalent changes made within the scope of this patent application are within the scope of the patent application.

Claims

1. A nitrogen regeneration system, comprising a heat exchanger (1), a cooler (2), a separator (3), and a heater (4), characterized in that: The A port of the heat exchanger (1) is connected to the inlet port (5), the B port of the heat exchanger (1) is connected to the inlet of the cooler (2), the C port of the heat exchanger (1) is connected to the inlet of the heater (4), and the D port of the heat exchanger (1) is connected to the air supply port (7) through the first pipe (6). The first pipe (6) is equipped with a first solenoid valve (8). The outlet of the cooler (2) is connected to the inlet of the separator (3). The gas phase outlet of the separator (3) is connected to the D port of the heat exchanger (1) through the second pipe (9). The second pipe (9) is connected in series with the second solenoid valve (10), the filter (11), the circulating fan (12) and the third solenoid valve (13). A gas composition sensor (14) is provided between the filter (11) and the circulating fan (12). A pressure sensor (15) is provided between the circulating fan (12) and the third solenoid valve (13). A safety torch (17) is connected between the gas composition sensor (14) and the circulating fan (12) through the third pipe (16). A fourth solenoid valve (18) is provided on the third pipe (16). The outlet of the heater (4) is connected to an output port (20) through a fourth pipe (19), and a temperature sensor (21) is provided on the fourth pipe (19).

2. The nitrogen regeneration system according to claim 1, characterized in that: The gas phase outlet of the separator (3) is connected between the outlet of the circulating fan (12) and the inlet of the third solenoid valve (13) through the fifth pipe (22). The fifth pipe (22) is provided with a fifth solenoid valve (23); the second pipe (9) is provided with a seventh solenoid valve (28) between the third solenoid valve (13) and the pressure sensor (15).

3. A nitrogen regeneration system according to claim 2, characterized in that: The gas phase outlet of the separator (3) is connected to the safety torch (17) through a sixth pipe (24), and a sixth solenoid valve (25) is provided on the sixth pipe (24).

4. The nitrogen regeneration system according to claim 1, characterized in that: The liquid phase outlet of the separator (3) is connected to a drain valve (26), and the separator (3) is equipped with a liquid level sensor (27), which is electrically connected to the drain valve (26).

5. A nitrogen regeneration system according to claim 1, characterized in that: It also includes a controller, and each of the solenoid valves, each of the sensors, the heater (4) and the circulating fan (12) are electrically connected to the controller.

6. A nitrogen regeneration system according to claim 1, characterized in that: The heat exchanger (1) is a finned tube or shell-and-tube structure.

7. A nitrogen regeneration system according to claim 1, characterized in that: The separator (3) is equipped with a cyclone separation unit and a demister, and the demister is a corrugated plate or fiber bed structure.

8. A nitrogen regeneration system according to claim 1, characterized in that: The circulating fan (12) is a variable frequency type.

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