Automatic nitrogen filling device and use method

Abstract

The present invention discloses an automatic nitrogen filling device, comprising equipment to be filled with nitrogen, a nitrogen filling module, a nitrogen drying module connected to the nitrogen filling module through a pipeline, and a control system electrically connected to the nitrogen filling module and the nitrogen drying module respectively; wherein, the nitrogen filling module comprises a nitrogen generator, which is connected to the equipment to be filled with nitrogen through a nitrogen pipeline; the nitrogen drying module comprises a circulating fan, a heater and a drying box connected to the equipment to be filled with nitrogen in sequence through pipelines. The present invention also discloses a method for using the automatic nitrogen filling device. The automatic nitrogen filling device can be used for nitrogen filling and dehumidification maintenance of thermal equipment. The automatic nitrogen filling device has a simple structure and is easy to implement, which solves the problem of poor dehumidification effect in the current nitrogen filling and maintenance of thermal equipment. At the same time, the automatic nitrogen filling device has a high degree of automation. After the equipment is debugged, it can work unmanned for a long time, can realize quantitative nitrogen filling, and greatly reduce the workload of nitrogen filling maintenance and other problems.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment corrosion control, and in particular to an automatic nitrogen filling device and a use method thereof. Background Art

[0002] The steam turbines, high-pressure heaters, low-pressure heaters, deaerators, heat network heaters, internal cooling water systems, and constant cooling water systems of thermal power plants are expensive. During equipment outages, nitrogen filling maintenance is one of the commonly used maintenance methods to prevent atmospheric corrosion of the equipment.

[0003] Prior to nitrogen filling maintenance, thermal equipment typically undergoes dehumidification, such as compressed air purging, to remove residual moisture. However, this dehumidification method is limited in effectiveness, and residual water in some equipment corners cannot be removed during the compressed air purge phase. Because oxygen cannot be completely removed from the equipment, the presence of residual water cannot completely prevent corrosion during equipment downtime. Some equipment attempts to incorporate desiccants into the equipment during maintenance, leveraging their moisture absorption to reduce humidity. However, this method is slow, the drying effect cannot be quantified, and desiccant failure cannot be monitored. Furthermore, some northern power plants face issues with freezing protection during equipment downtime. For example, if residual water is not removed from equipment pipes before nitrogen filling, the equipment cannot be insulated and frost-proofed after filling, making pipe cracking a serious risk. Furthermore, nitrogen filling maintenance during thermal equipment downtime requires regular maintenance by professionals to maintain a positive nitrogen pressure within the system, increasing the workload of thermal equipment maintenance. Summary of the Invention

[0004] The invention discloses an automatic nitrogen filling device and a use method thereof, so as to solve the problem of poor dehumidification effect of the nitrogen filling device in the prior art.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] According to one aspect of the present invention, there is provided an automatic nitrogen-charging device, comprising equipment to be nitrogen-charged, a nitrogen-charging module, a nitrogen drying module connected to the nitrogen-charging module via a pipeline, and a control system electrically connected to the nitrogen-charging module and the nitrogen drying module, respectively; wherein the nitrogen-charging module comprises a nitrogen generator connected to the equipment to be nitrogen-charged via a nitrogen pipeline; and the nitrogen drying module comprises a circulating fan, a heater, and a drying oven, which are sequentially connected to the equipment to be nitrogen-charged via pipelines.

[0007] Optionally, the circulating fan includes a circulating fan inlet and a circulating fan outlet, the heater includes a heater inlet and a heater outlet, and the drying box includes a drying box inlet and a drying box outlet; the circulating fan inlet is connected to the nitrogen outlet of the equipment to be filled with nitrogen through a pipeline; the circulating fan outlet is connected to the heater inlet through a pipeline; the heater outlet is connected to the drying box inlet through a pipeline; and the drying box outlet is connected to the nitrogen inlet of the equipment to be filled with nitrogen through a pipeline.

[0008] Optionally, the nitrogen generator is connected to the nitrogen inlet of the equipment to be filled with nitrogen through a pipeline, and a nitrogen charging solenoid valve K1 is provided on the pipeline between the nitrogen generator and the equipment to be filled with nitrogen; a nitrogen generator pressure transmitter PT1 for sensing the nitrogen pressure at the nitrogen generator outlet is provided on the pipeline at the outlet of the nitrogen generator between the nitrogen generator and the nitrogen charging solenoid valve K1; a pressure transmitter PT2 for sensing the nitrogen pressure in the equipment to be filled with nitrogen and feeding back the pressure value to the control system is provided on the pipeline at the nitrogen inlet of the equipment to be filled with nitrogen between the nitrogen charging solenoid valve K1 and the equipment to be filled with nitrogen.

[0009] Optionally, the drying box is provided with an observation window for observing the discoloration of the desiccant inside the drying box; a drying box outlet valve K3 is provided on the pipeline between the drying box outlet and the nitrogen inlet of the equipment to be charged with nitrogen; a humidity transmitter HT2 for sensing the humidity at the drying box outlet is provided on the pipeline between the drying box outlet and the nitrogen inlet of the equipment to be charged with nitrogen; and an air vent valve K5 is provided on the outlet side of the drying box.

[0010] Optionally, a temperature transmitter TT2 for sensing the nitrogen temperature at the heater outlet is provided on the pipe between the heater outlet and the drying box inlet; a fan inlet valve K2 is provided on the pipe at the circulating fan inlet of the circulating fan; a bypass pipe is connected to the pipe between the circulating fan and the fan inlet valve K2, and an air inlet valve K4 is provided on the bypass pipe.

[0011] Optionally, a temperature transmitter TT1 for sensing the temperature inside the equipment to be nitrogen-charged is provided on the pipeline between the equipment to be nitrogen-charged and the circulating fan; a humidity transmitter HT1 for sensing the humidity inside the equipment to be nitrogen-charged is provided on the pipeline between the equipment to be nitrogen-charged and the circulating fan; a nitrogen circulation bypass is provided at the nitrogen outlet of the equipment to be nitrogen-charged, and a nitrogen purity transmitter is provided at the inlet of the nitrogen circulation bypass; a safety valve is also provided at the nitrogen outlet of the equipment to be nitrogen-charged.

[0012] Optionally, the control system is electrically connected to the nitrogen charging solenoid valve K1, the fan inlet valve K2, the drying box outlet valve K3, the air inlet valve K4, and the air vent valve K5 to control the opening and closing of the valves; the control system is also electrically connected to the heater, the circulating fan, the temperature transmitter TT1, the temperature transmitter TT2, the humidity transmitter HT1, the humidity transmitter HT2, the pressure transmitter PT2 and the nitrogen purity transmitter.

[0013] According to a second aspect of the present invention, there is provided a method for using the automatic nitrogen filling device according to the first aspect of the present invention, comprising: a) checking the air tightness of a system consisting of equipment to be filled with nitrogen, a circulating fan, a heater, and a drying oven; b) when the air tightness check of the system is qualified, filling the system with nitrogen through a nitrogen generator; c) opening an air outlet and displacing and exhausting the air in the equipment to be filled with nitrogen, the circulating fan, the heater, and the drying oven by filling the system with nitrogen; d) closing the air outlet and continuing to introduce nitrogen into the system so that the equipment to be filled with nitrogen reaches a target pressure value.

[0014] Optionally, step a) specifically includes: closing the nitrogen charging solenoid valve K1 and the air venting valve K5, opening the fan inlet valve K2, the air inlet valve K4 and the drying box outlet valve K3, connecting compressed air to the system from the air inlet valve K4, reading the air pressure in the equipment to be nitrogen-charged through the pressure transmitter PT2, and maintaining the pressure to a first predetermined pressure value for a certain period of time, and judging whether the system air tightness is qualified according to the pressure drop.

[0015] Optionally, step b) specifically includes: opening the nitrogen generator, the nitrogen charging solenoid valve K1, the fan inlet valve K2 and the drying box outlet valve K3, closing the air inlet valve K4 and the air vent valve K5, and charging nitrogen into the system.

[0016] Optionally, step c) specifically includes: when the pressure transmitter PT2 reads that the nitrogen pressure in the equipment to be charged with nitrogen reaches a second predetermined pressure value, closing the drying box outlet valve K3, opening the fan inlet valve K2 and the air inlet valve K4, and simultaneously opening the nitrogen purity transmitter to read the nitrogen purity value; and when the nitrogen purity value reaches above the predetermined value, opening the air release valve K5 and closing the air inlet valve K4.

[0017] Optionally, step d) specifically includes: closing the air vent valve K5, opening the drying box outlet valve K3, continuing to introduce nitrogen into the system to make the equipment to be nitrogen-filled reach the target pressure value, and starting the circulation fan at the same time.

[0018] Optionally, the method of use further includes: when the temperature read by the temperature transmitter TT1 is lower than the minimum temperature setting value, controlling the start-up of the heater through the control system; when the temperature read by the temperature transmitter TT2 is higher than the maximum temperature setting value, shutting down the heater through the control system.

[0019] Optionally, the method of use further includes: when the humidity read by the humidity transmitter HT2 is higher than the threshold humidity setting value, closing the circulation fan inlet valve K2 and the drying box outlet valve K3 through the control system, opening the air inlet valve K4 and the air vent valve K5, starting the circulation fan and the heater, and using hot air to regenerate the desiccant.

[0020] Optionally, the method of use further includes: after the desiccant is regenerated, closing the heater, opening the circulating fan inlet valve K2 and the air vent valve K5, closing the air inlet valve K4, and using nitrogen to replace and exhaust the air in the heater and the drying box; thereafter, proceeding to step d).

[0021] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0022] 1) The present invention provides an automatic nitrogen charging device for nitrogen filling and dehumidification maintenance of thermal equipment. This device has a simple structure and is easy to implement, resolving the current issue of poor dehumidification during nitrogen filling and maintenance of thermal equipment. Furthermore, this device boasts a high degree of automation, enabling long-term unattended operation after commissioning. This device allows for quantitative nitrogen filling, significantly reducing the workload and maintenance of nitrogen filling. It can also be used for automatic nitrogen filling and maintenance of thermal equipment during construction and outages.

[0023] 2) The automatic nitrogen filling device provided by this invention can maintain the humidity and temperature of nitrogen in equipment to be filled with nitrogen, such as thermal equipment, during maintenance. By incorporating a nitrogen drying module, this invention not only dehumidifies and dries the nitrogen within the thermal equipment but also maintains the equipment temperature within the required range. This not only improves maintenance effectiveness but also prevents frostbite on thermal equipment in northern China. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 Schematic diagram of the structure of the automatic nitrogen filling device according to the present invention.

[0026] Description of reference numerals:

[0027] 1 Nitrogen Generator

[0028] 2 Nitrogen pipeline

[0029] 3Nitrogen generator pressure transmitter PT1

[0030] 4 Nitrogen charging solenoid valve K1

[0031] 5Pressure transmitter PT2

[0032] 6 Equipment to be filled with nitrogen

[0033] 7 Safety valve

[0034] 8Nitrogen purity transmitter

[0035] 9Temperature transmitter TT1

[0036] 10Humidity transmitter HT1

[0037] 11 Fan inlet valve K2

[0038] 12 Air inlet valve K4

[0039] 13 Circulation fan

[0040] 14 Heater

[0041] 15 Temperature transmitter TT2

[0042] 16 drying oven

[0043] 17 Air vent valve K5

[0044] 18 Drying box outlet valve K3

[0045] 19Humidity transmitter HT2

[0046] 20 control system DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] The technical solutions disclosed in various embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0049] According to one embodiment of the present invention, an automatic nitrogen charging device is provided, comprising equipment to be nitrogen-charged 6, a nitrogen charging module, a nitrogen drying module connected to the nitrogen charging module via a pipeline, and a control system electrically connected to the nitrogen charging module and the nitrogen drying module, respectively; wherein the nitrogen charging module comprises a nitrogen generator 1, which is connected to the equipment to be nitrogen-charged 6 via a nitrogen pipeline 2; the nitrogen drying module comprises a circulating fan 13, a heater 14, and a drying box 16, which are sequentially connected to the equipment to be nitrogen-charged 6 via pipelines.

[0050] Specifically, for example, the equipment to be filled with nitrogen can be a thermal device. In the nitrogen drying module, a circulating fan provides power for the nitrogen bypass cycle. The circulating fan outlet is connected in series with a heater and a drying oven through a nitrogen pipeline to heat and dry the nitrogen, respectively. For example, heater 14 can be an electric heater.

[0051] Specifically, the circulating fan 13 includes a circulating fan inlet and a circulating fan outlet, the heater 14 includes a heater inlet and a heater outlet, and the drying box 16 includes a drying box inlet and a drying box outlet; wherein the drying box inlet and the drying box outlet are respectively arranged on opposite sides of the desiccant layer, so that the gas to be filled enters the drying box through the desiccant inlet, passes through the entire desiccant layer, and leaves the drying box from the drying box outlet located on the other side. The circulating fan inlet is connected to the nitrogen outlet of the device to be filled with nitrogen 6 via a pipeline; the circulating fan outlet is connected to the heater inlet via a pipeline; the heater outlet is connected to the drying box inlet via a pipeline; and the drying box outlet is connected to the nitrogen inlet of the device to be filled with nitrogen 6 via a pipeline. The nitrogen inlet and the nitrogen outlet are respectively located on opposite sides of the device to be filled with nitrogen, so that after the gas enters the device to be filled with nitrogen from the nitrogen inlet, it flows and fills the entire device to be filled with nitrogen, and then flows out from the nitrogen outlet of the device to be filled with nitrogen.

[0052] Furthermore, the nitrogen generator 1 is connected to the nitrogen inlet of the equipment to be filled with nitrogen through a pipeline, and a nitrogen charging solenoid valve K14 is provided on the pipeline between the nitrogen generator 1 and the equipment to be filled with nitrogen 6; a nitrogen generator pressure transmitter PT13 for sensing the nitrogen pressure at the nitrogen generator outlet is provided on the pipeline at the outlet of the nitrogen generator 1 between the nitrogen generator 1 and the nitrogen charging solenoid valve K14; a pressure transmitter PT25 for sensing the nitrogen pressure in the equipment to be filled with nitrogen 6 and feeding back the pressure value to the control system is provided on the pipeline at the nitrogen inlet of the equipment to be filled with nitrogen 6 between the nitrogen charging solenoid valve K14 and the equipment to be filled with nitrogen 6.

[0053] Therefore, the nitrogen pressure at the outlet of the nitrogen generator 1 is read through the nitrogen generator pressure transmitter PT13; the nitrogen pressure in the equipment to be nitrogen-filled 6 is read through the pressure transmitter PT25 and fed back to the control system 20, and the nitrogen pressure in the equipment to be nitrogen-filled 6 is maintained by controlling the switch of the nitrogen filling solenoid valve K14.

[0054] Furthermore, the drying box 16 is provided with an observation window for observing the color change of the desiccant inside the drying box 16 , that is, the failure of the color-changing silica gel desiccant in the drying box 16 can be observed through the observation window.

[0055] Furthermore, a drying box outlet valve K318 is provided on the pipeline between the drying box outlet and the nitrogen inlet of the equipment to be filled with nitrogen 6.

[0056] Furthermore, a humidity transmitter HT219 is installed on the pipeline between the drying oven 16 outlet and the nitrogen inlet of the nitrogen-filled equipment 6. It senses the humidity at the drying oven outlet. An air vent valve K517 is installed on the drying oven outlet. The humidity transmitter HT219 reads the humidity of the gas after drying in the drying oven, and this humidity value can be used to determine the desiccant failure within the drying oven.

[0057] Furthermore, a temperature transmitter TT215 for sensing the nitrogen temperature at the outlet of the heater 14 is provided on the pipe between the heater outlet and the drying box inlet; the nitrogen temperature at the outlet of the heater 14 is read by the temperature transmitter TT215 and fed back to the control system, and the control system determines whether to stop or start the heater based on the read value.

[0058] Furthermore, a fan inlet valve K211 is installed on the pipe at the inlet of the circulating fan 13. A bypass pipe is connected to the pipe between the circulating fan 13 and the fan inlet valve K211, and an air inlet valve K412 is installed on the bypass pipe. The air inlet valve K412 allows air to be introduced or exhausted according to different circumstances. For example, when performing a system airtightness check or heating and drying the desiccant, the air inlet valve K4 can be opened to allow air in. It can also be opened to exhaust air when displacing and completely exhausting the air in the equipment to be filled with nitrogen.

[0059] As a specific embodiment, a temperature transmitter TT19 is installed on the pipeline between the device to be nitrogen-charged 6 and the circulating fan 13 to sense the temperature within the device 6. A humidity transmitter HT110 is also installed on the pipeline between the device 6 and the circulating fan 13 to sense the humidity within the device 6. A nitrogen circulation bypass is installed at the nitrogen outlet of the device 6, and a nitrogen purity transmitter 8 is installed at the inlet of the nitrogen circulation bypass. A safety valve 7 is also installed at the nitrogen outlet of the device 6. The nitrogen purity transmitter 8 provides feedback on the nitrogen purity within the thermal device 6 to the control system. The control system 20 replaces the nitrogen within the thermal device 6 by opening and closing the nitrogen charging solenoid valve K15 and the safety valve 7. The nitrogen pressure within the thermal device 6 is maintained by controlling the opening and closing of the nitrogen charging solenoid valve K14. If the pressure exceeds the limit, the nitrogen is discharged through the safety valve 7. Control system 20 reads signals from pressure transmitter PT2 5 and nitrogen purity transmitter 8 to switch the solenoid valve on and off, starting or stopping nitrogen filling in the equipment to be filled. Excess nitrogen is discharged through safety valve 7. Temperature transmitters TT1 9 and TT2 15 are installed in the nitrogen drying module, and the heater 14 is controlled by signals read by control system 20. The humidity of the nitrogen in the equipment to be filled 6 is read by humidity transmitter HT1 10, and the failure of the color-changing silica gel desiccant can be observed through an observation window in the drying oven 16.

[0060] Specifically, the control system 20 is electrically connected to the nitrogen charging solenoid valve K14, the fan inlet valve K211, the drying box outlet valve K318, the air inlet valve K412, and the air vent valve K517 to control the opening and closing of the valves; the control system is also electrically connected to the heater 14, the circulating fan 13, the temperature transmitter TT19, the temperature transmitter TT215, the humidity transmitter HT110, the humidity transmitter HT219, the pressure transmitter PT25 and the nitrogen purity transmitter 8.

[0061] According to another embodiment of the present invention, a method for using an automatic nitrogen filling device is provided, comprising:

[0062] a) Check the air tightness of the system consisting of the equipment to be nitrogen-charged 6, the circulating fan 13, the heater 14, and the drying box 16; b) When the system passes the air tightness check, charge the system with nitrogen through the nitrogen generator 1; c) Open the air outlet and charge nitrogen into the system to displace and exhaust the air in the equipment to be nitrogen-charged 6, the circulating fan 13, the heater 14, and the drying box 16; d) Close the air outlet and continue to charge nitrogen into the system until the equipment to be nitrogen-charged 6 reaches the target pressure value.

[0063] Specifically, step a) includes: After the nitrogen filling maintenance system is installed, close the nitrogen filling solenoid valve K14 and the air vent valve K517, open the fan inlet valve K211, the air inlet valve K412, and the drying box outlet valve K318, and introduce compressed air into the system through the air inlet valve K412 via a rubber hose. The air pressure in the device to be filled with nitrogen 6 is read using the pressure transmitter PT25. After the pressure is filled to a first predetermined value and maintained for a certain period of time, the air tightness of the system is determined based on the pressure drop. For example, after the pressure is filled to 30 kPa and maintained for 12 hours, if there is no significant pressure drop, the system is considered to be airtight.

[0064] Specifically, step b) includes: after the system air tightness is qualified, opening the nitrogen generator 1, the nitrogen charging solenoid valve K14, the fan inlet valve K211 and the drying box outlet valve K318, closing the air inlet valve K412 and the air release valve K517, and charging nitrogen into the system.

[0065] Specifically, step c) specifically includes: when the pressure transmitter PT25 reads that the nitrogen pressure in the equipment to be filled with nitrogen 6 reaches a second predetermined pressure value, for example, when the nitrogen pressure in the equipment to be filled with nitrogen 6 reaches 10 kPa, closing the drying box outlet valve K318, opening the fan inlet valve K211 and the air inlet valve K412, exhausting through the air inlet valve K412, and simultaneously opening the nitrogen purity transmitter 8 to read the nitrogen purity value; and when the nitrogen purity value reaches above a predetermined value, for example, when it reaches above 98%, opening the air release valve K517, closing the air inlet valve K412, and using nitrogen to replace and exhaust the air in the electric heater 14 and the drying box 16.

[0066] Specifically, step d) includes: closing the air vent valve K517, opening the drying box outlet valve K318, continuing to introduce nitrogen into the system to make the nitrogen-filled equipment 6 reach the target pressure value, and simultaneously starting the circulating fan 13 to dehumidify and dry the nitrogen in the nitrogen-filled equipment 6.

[0067] Furthermore, the method for using the automatic nitrogen filling device may also include: when the temperature read by the temperature transmitter TT19 is lower than the minimum temperature setting value, for example, when the temperature read by the temperature transmitter TT19 is lower than 8°C, controlling the start-up of the heater 14 through the control system 20; the nitrogen temperature at the outlet of the electric heater 14 is read by the temperature transmitter TT215, and when the temperature read by the temperature transmitter TT215 is higher than the maximum temperature setting value, for example, when the temperature read by the temperature transmitter TT215 exceeds 20°C, shutting down the heater 14 through the control system 20.

[0068] Furthermore, the method for using the automatic nitrogen filling device can also include: the humidity of the nitrogen in the equipment to be nitrogen-filled 6 is read by the humidity transmitter HT110, the failure of the color-changing silica gel desiccant in the drying box 16 is observed through the observation window, and the humidity at the outlet of the drying box is measured by the humidity transmitter HT219; when the humidity read by the humidity transmitter HT219 is higher than the threshold humidity setting value, for example, when the humidity read by the humidity transmitter HT219 reaches 45%, the desiccant in the drying box 16 is started to be regenerated; during the desiccant regeneration process, the circulation fan inlet valve K211 and the drying box outlet valve K318 are closed by the control system 20, the air inlet valve K412 and the air vent valve 17 are opened, the circulation fan 13 and the heater 14 are started, the desiccant is regenerated by hot air, and the regeneration of the color-changing silica gel desiccant is observed through the observation window.

[0069] Furthermore, the method for using the automatic nitrogen filling device may also include: after the desiccant regeneration is completed, closing the heater 14, opening the circulating fan inlet valve K211 and the air vent valve K517, closing the air inlet valve K412, and using nitrogen to replace and exhaust the air in the heater 14 and the drying box 16; then, proceeding to step d), that is, closing the air vent valve K517, opening the drying box outlet valve K318, and continuing to introduce nitrogen into the system so that the equipment to be nitrogen-filled 6 reaches the target pressure value, and at the same time starting the circulating fan 13, and putting the nitrogen drying module into use.

[0070] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0071] The foregoing is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. An automatic nitrogen filling device, characterized in that: It comprises a device to be filled with nitrogen (6), a nitrogen filling module, a nitrogen drying module connected to the nitrogen filling module via a pipeline, and a control system (20) electrically connected to the nitrogen filling module and the nitrogen drying module respectively; Wherein, the nitrogen filling module comprises a nitrogen generator (1), and the nitrogen generator (1) is connected to the equipment to be filled with nitrogen (6) via a nitrogen pipeline (2); The nitrogen drying module comprises a circulating fan (13), a heater (14) and a drying box (16) which are sequentially connected to the nitrogen-filled equipment (6) through pipelines. The circulating fan (13) includes a circulating fan inlet and a circulating fan outlet; the drying box (16) includes a drying box inlet and a drying box outlet; The circulating fan inlet is connected to the nitrogen outlet of the nitrogen-filled equipment (6) through a pipeline; An air vent valve K5 (17) is provided on the outlet side of the drying box; A fan inlet valve K2 (11) is provided on the pipeline at the inlet of the circulating fan (13); A bypass pipe is connected to the pipe between the circulating fan (13) and the fan inlet valve K2 (11), and an air inlet valve K4 (12) is provided on the bypass pipe.

2. The automatic nitrogen filling device according to claim 1, characterized in that: The heater (14) includes a heater inlet and a heater outlet; The circulating fan outlet is connected to the heater inlet through a pipeline; The heater outlet is connected to the drying box inlet via a pipeline; The drying box outlet is connected to the nitrogen inlet of the nitrogen-filled equipment (6) through a pipeline.

3. The automatic nitrogen filling device according to claim 2, characterized in that: The nitrogen generator (1) is connected to the nitrogen inlet of the device to be filled with nitrogen (6) through a pipeline, and a nitrogen charging solenoid valve K1 (4) is provided on the pipeline between the nitrogen generator (1) and the device to be filled with nitrogen (6); A nitrogen generator pressure transmitter PT1 (3) for sensing the nitrogen pressure at the nitrogen generator outlet is provided on a pipeline at the outlet of the nitrogen generator (1) between the nitrogen generator (1) and the nitrogen charging solenoid valve K1 (4); A pressure transmitter PT2 (5) for sensing the nitrogen pressure in the equipment to be charged with nitrogen (6) and feeding back the pressure value to a control system (20) is provided on a pipeline at the nitrogen inlet of the equipment to be charged with nitrogen (6) between the nitrogen charging solenoid valve K1 (4) and the equipment to be charged with nitrogen (6).

4. The automatic nitrogen filling device according to claim 2, characterized in that: The drying box (16) is provided with an observation window for observing the color change of the desiccant inside the drying box (16); A drying box outlet valve K3 (18) is provided on the pipeline between the drying box outlet and the nitrogen inlet of the nitrogen-filled device (6); A humidity transmitter HT2 (19) for sensing the humidity at the drying box outlet is provided on the pipeline between the drying box outlet and the nitrogen inlet of the nitrogen-filled device (6).

5. The automatic nitrogen filling device according to claim 2, characterized in that: A temperature transmitter TT2 (15) for sensing the nitrogen temperature at the outlet of the heater (14) is provided on the pipeline between the outlet of the heater and the inlet of the drying box.

6. The automatic nitrogen filling device according to claim 2, characterized in that: A temperature transmitter TT1 (9) for sensing the temperature inside the nitrogen-filled device (6) is provided on the pipeline between the nitrogen-filled device (6) and the circulating fan (13); A humidity transmitter HT1 (10) for sensing the humidity in the equipment to be filled with nitrogen (6) is provided on the pipeline between the equipment to be filled with nitrogen (6) and the circulating fan (13); A nitrogen circulation bypass is provided at the nitrogen outlet of the nitrogen-filled equipment (6), and a nitrogen purity transmitter (8) is provided at the inlet of the nitrogen circulation bypass; A safety valve (7) is also provided at the nitrogen outlet of the nitrogen-filled equipment (6).

7. The automatic nitrogen filling device according to any one of claims 1 to 6, characterized in that: The control system is electrically connected to the nitrogen charging solenoid valve K1 (4), the fan inlet valve K2 (11), the drying box outlet valve K3 (18), the air inlet valve K4 (12), and the air release valve K5 (17) to control the opening and closing of the valves; The control system is also electrically connected to the heater (14), the circulating fan (13), the temperature transmitter TT1 (9), the temperature transmitter TT2 (15), the humidity transmitter HT1 (10), the humidity transmitter HT2 (19), the pressure transmitter PT2 (5) and the nitrogen purity transmitter (8).

8. The method for using the automatic nitrogen filling device according to any one of claims 1 to 7, characterized in that: include: a) Check the air tightness of the system consisting of the nitrogen filling equipment (6), the circulating fan (13), the heater (14) and the drying box (16); b) When the air tightness inspection of the system is qualified, nitrogen is charged into the system through the nitrogen generator (1); c) opening the air outlet and displacing and exhausting the air in the nitrogen-filled equipment (6), the circulating fan (13), the heater (14) and the drying box (16) by filling the system with nitrogen; d) closing the air outlet and continuing to introduce nitrogen into the system so that the nitrogen-filled equipment (6) reaches the target pressure value.

9. The method of use according to claim 8, characterized in that: Step a) specifically includes: Close the nitrogen charging solenoid valve K1 (4) and the air release valve K5 (17), open the fan inlet valve K2 (11), the air inlet valve K4 (12) and the drying box outlet valve K3 (18), and connect the compressed air to the system through the air inlet valve K4 (12). Read the air pressure in the device to be charged with nitrogen (6) through the pressure transmitter PT2 (5). After charging to a first predetermined pressure value and maintaining it for a certain period of time, determine whether the system is airtight according to the pressure drop.

10. The method of use according to claim 8, characterized in that: Step b) specifically includes: Open the nitrogen generator (1), the nitrogen charging solenoid valve K1 (4), the fan inlet valve K2 (11) and the drying box outlet valve K3 (18), close the air inlet valve K4 (12) and the air release valve K5 (17), and fill the system with nitrogen.

11. The method of use according to claim 8, characterized in that: Step c) specifically includes: When the pressure transmitter PT2 (5) reads that the nitrogen pressure in the nitrogen-filled device (6) reaches a second predetermined pressure value, the drying box outlet valve K3 (18) is closed, the fan inlet valve K2 (11) and the air inlet valve K4 (12) are opened, and the nitrogen purity transmitter (8) is opened at the same time to read the nitrogen purity value; and When the nitrogen purity value reaches above the predetermined value, the air release valve K5 (17) is opened and the air inlet valve K4 (12) is closed.

12. The method of use according to claim 8, characterized in that: Step d) specifically includes: Close the air vent valve K5 (17), open the drying box outlet valve K3 (18), continue to introduce nitrogen into the system, so that the nitrogen-filled equipment (6) reaches the target pressure value, and start the circulation fan (13) at the same time.

13. The method of use according to claim 8, characterized in that: Also includes: When the temperature read by the temperature transmitter TT1 (9) is lower than the minimum temperature setting value, the heater (14) is started by the control system (20); When the temperature read by the temperature transmitter TT2 (15) is higher than the maximum temperature setting value, the heater (14) is turned off by the control system (20).

14. The method of use according to claim 8, characterized in that: Also includes: When the humidity read by the humidity transmitter HT2 (19) is higher than the threshold humidity setting value, the control system (20) closes the circulation fan inlet valve K2 (11) and the drying box outlet valve K3 (18), opens the air inlet valve K4 (12) and the air vent valve K5 (17), starts the circulation fan (13) and the heater (14), and uses hot air to regenerate the desiccant.

15. The method of use according to claim 14, characterized in that: Also includes: After the desiccant regeneration is completed, the heater (14) is turned off, the circulating fan inlet valve K2 (11) and the air vent valve K5 (17) are opened, the air inlet valve K4 (12) is closed, and the air in the heater (14) and the drying box (16) is replaced and exhausted with nitrogen; Afterwards, proceed to step d).

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