Pressure self-control nitrogen recycling device and process thereof

Abstract

The invention discloses a pressure self-control nitrogen recovery circulating device and a process thereof, and relates to the technical field of nitrogen recovery, the pressure self-control nitrogen recovery circulating device comprises a nitrogen storage tank, a product storage tank and a purification mechanism; the purification mechanism comprises a purification box, a partition plate, an air inlet plate, a fine filter element, an adsorption part and a filter assembly; the filtering assembly comprises a supporting seat, a filtering seat and a filtering net belt; the nitrogen storage tank, the product storage tank, the purification box, the fine filter element, the adsorption part, the supporting seat, the filter seat, the filter screen belt and the pipeline assembly are matched for use, when the product storage tank receives materials and the pressure rises due to temperature rise, gas in the tank is actively led out, impact of violent fluctuation of the pressure in the tank on the storage tank and related equipment is avoided, and the service life of the storage tank is prolonged. The pressure in the storage tank is ensured to be always in a safety threshold range, nitrogen is supplemented as required when the storage tank is filled with materials or the temperature is reduced, and when emergency states such as overpressure of the nitrogen storage tank occur, gas can directly enter the adsorption unit for efficient adsorption treatment, and rapid standard emission of tail gas is ensured.

Description

Technical Field

[0001] This invention belongs to the field of nitrogen recovery technology, specifically a pressure-controlled nitrogen recovery and circulation device and its process. Background Technology

[0002] In the production processes of industries such as petrochemicals and fine chemicals, product storage tanks serve as core storage equipment for raw materials, intermediates, and finished products. The stability of their internal pressure directly impacts storage safety and product quality. During the material receiving process, the increased volume of materials compresses the gas inside the tank, and fluctuations in ambient temperature cause the gas to expand due to heat, both of which lead to a gradual increase in internal pressure. To balance the internal pressure and avoid the risk of overpressure, traditional product storage tanks are typically equipped with breather valves. When the internal pressure reaches the valve's release pressure, excess gas is either directly released into the atmosphere through the valve or released after only simple treatment.

[0003] Currently, the industry mainly uses two methods to handle exhaust gas from storage tanks: one is direct discharge without recovery treatment. This method not only wastes inert gas resources such as nitrogen, but also releases volatile organic gases from the tank into the atmosphere, causing air pollution and failing to meet the strict requirements of environmental regulations for exhaust gas emissions. At the same time, the loss of organic gases also causes certain economic losses. The other method is to treat the exhaust gas with simple oil and gas recovery equipment before discharge. Although this can reduce some pollutant emissions, the treated gas is often directly discharged, which cannot realize the recycling of gas resources. Moreover, some treatment equipment has low purification efficiency for organic gases, making it difficult to meet the stringent emission concentration standards, and still poses environmental risks. Furthermore, when treating the exhaust gas before discharge, sudden situations such as overpressure of the gas storage equipment are prone to occur, making it impossible to quickly treat the gas in compliance with regulations and achieve emission standards. This can easily lead to safety hazards, reduce the stability and reliability of the oil and gas recovery equipment, and fail to meet people's needs. Summary of the Invention

[0004] The present invention aims to solve the technical problems existing in the prior art; to this end, the present invention proposes a pressure-controlled nitrogen recovery and circulation device and its process.

[0005] A pressure-controlled nitrogen recovery and circulation device includes a nitrogen storage tank and a product storage tank connected to the nitrogen storage tank. A purification mechanism for purifying the gas in the product storage tank is located on the other side of the product storage tank. Pipe assemblies connect the nitrogen storage tank, the product storage tank, and the purification mechanism. The purification mechanism includes a purification chamber, a vertically positioned partition plate in the middle of the purification chamber, and a horizontally positioned air inlet plate on the lower inner side of the purification chamber. The bottom end of the partition plate is aligned with the middle of the upper surface of the air inlet plate. The air inlet plate divides the internal space of the purification chamber into an upper purification chamber and a lower filtration chamber. The partition plate evenly divides the upper purification chamber. The purification mechanism also includes components arranged from bottom to top... The upper purification chamber contains a fine filter element and an adsorption element that works in conjunction with the fine filter element. The lower filtration chamber contains a filter assembly for preliminary filtration of the gas. The filter assembly includes a support base vertically arranged in the lower filtration chamber and filter seats symmetrically and inclinedly arranged in the lower filtration chamber. One end of the filter seat is connected to the support base, and the upper end of the support base is vertically connected to the middle of the lower end face of the air inlet plate. A filter mesh belt for preliminary filtration of the gas is movably arranged in the filter seat. The bottom of the purification chamber has a drain port communicating with the lower filtration chamber. The filter seats are inclined downwards towards the side closer to the support base, and the support base has a connecting groove that matches the filter seat.

[0006] As a further aspect of the present invention: the nitrogen storage tank is provided with a first adapter, and the product storage tank is provided with a second adapter. Both the first and second adapters are provided with gas valves. The gas valves on the nitrogen storage tank are capable of pressure regulation. The pipeline assembly includes a first air inlet pipe connected to the first and second adapters and a second air inlet pipe disposed on the second adapter and connected to the purification box. The purification box is symmetrically provided with a first exhaust hood and a second exhaust hood. The first exhaust hood is provided with a return air pipe communicating with the first adapter. The upper end of the second exhaust hood is provided with an exhaust pipe. The second adapter is provided with a third air inlet pipe connected to the purification box. The third air inlet pipe is connected to the purification box and the exhaust pipe. The third air inlet pipe is provided with an emergency discharge pipeline valve. One-way valves are provided on the first air inlet pipe, the second air inlet pipe, the return air pipe, the exhaust pipe, and the third air inlet pipe. Pressure gauges are provided on both the first and second adapters. The pressure gauges are provided with pressure sensors and controllers used in conjunction with the pressure sensors. Recovery start thresholds and replenishment start thresholds are set on the pressure gauges.

[0007] As a further aspect of the present invention: due to the entry of receiving materials and the increase in ambient temperature, the gas in the gas phase space inside the product storage tank expands and the pressure gradually rises. When the pressure reaches the recovery start threshold, the pressure sensor sends a signal to the controller, causing the mixed gas in the product storage tank to enter the purification box through the second air inlet pipe. After being purified by the purification mechanism, the purified gas must meet the following indicators: organic gas concentration <0.05%, N2 purity >99.5%. At this time, because the system operating pressure is stable at 0.8-1.5MPa, the purified high-pressure nitrogen does not need to be pressurized by a compressor. After being adjusted to the appropriate pressure for the nitrogen storage tank by the pressure regulating valve, it is directly sent into the tank for storage. When the pressure of the product storage tank drops to the recovery stop threshold, the controller closes the pipeline assembly, and the recovery process ends. As the output of feed materials and the decrease in ambient temperature cause the gas phase space inside the product storage tank to shrink, the pressure gradually decreases. When the pressure reaches the replenishment start threshold, the pressure sensor sends a signal to the controller, causing the nitrogen storage tank to adjust the high-purity nitrogen to a pressure that matches the product storage tank through the gas valve and the first inlet pipe, and deliver it to the product storage tank. When the pressure in the product storage tank rises to the replenishment stop threshold, the controller closes the pipeline assembly, and the replenishment process ends. When the pressure in the nitrogen storage tank exceeds the safety threshold, or when other malfunctions occur in the product storage tank and pipeline components that prevent the normal recovery / replenishment process from running, the controller will introduce the excess gas into the purification chamber through the third air inlet pipe for purification treatment, and then discharge the purified gas directly to the outside. After the system pressure returns to the safe range, the third air inlet pipe and the air outlet pipe will be closed.

[0008] As a further aspect of the present invention: the filter assembly further includes a first synchronous belt structure disposed in the filter seat and controlling the movement of the filter screen belt, and a connecting belt aligning and connecting the first synchronous belt structure with the filter screen belt, wherein the filter screen belt, the first synchronous belt structure and the connecting belt are all configured as conveyor belts; the filter seat is provided with a cleaning assembly for cleaning the filter screen belt.

[0009] As a further aspect of the present invention: the cleaning assembly includes a plurality of first scraper strips vertically disposed on the lower inner side of the filter seat for cleaning the filter belt and a striking roller rotatably disposed on the inner side of the filter seat for knocking and cleaning the filter belt. The striking roller is provided with striking strips for knocking the lower side of the filter belt. The cleaning assembly also includes a second synchronous belt structure coaxially connected to the striking roller, one end of the second synchronous belt structure being coaxially connected to one end of the first synchronous belt structure.

[0010] As a further aspect of the present invention: the cleaning assembly further includes a cleaning roller rotatably disposed on the upper inner side of the filter seat and in contact with the upper side of the filter belt. The cleaning roller can tension the filter belt. The cleaning roller is fitted with a cleaning brush sleeve for cleaning the inner side of the filter belt. A drive motor for controlling the rotation of the cleaning roller is provided on the outer side of the filter seat. A first rotating rod coaxially connected to the cleaning roller is provided on the output shaft of the drive motor.

[0011] As a further aspect of the present invention: the lower side of the cleaning roller is movably provided with a second scraper for cleaning the cleaning brush sleeve and a connecting strip aligned with the second scraper; the bottom end of the second scraper is provided with a plurality of connecting rods extending into the connecting strip, and the connecting strip is provided with a support spring connected to the connecting rod, and the connecting rod and the support spring cooperate to make the second scraper fit against the cleaning brush sleeve.

[0012] As a further aspect of the present invention: the filter seat is provided with a collection assembly for collecting impurities cleaned by the second scraper. The collection assembly includes a collection box disposed inside the filter seat and spiral conveyors symmetrically and movably disposed in the collection box. The inner side of the collection box is provided with a collection groove that cooperates with the two spiral conveyors. The upper end of the collection box is provided with a collection port that cooperates with the second scraper. The connecting strip is disposed in the collection port, so that the second scraper cleans the impurities on the second scraper into the collection box. The side of the collection box near the first synchronous belt structure is fixed to the inner wall of the filter seat. The other end of the collection box extends into the interior of the filter seat. A discharge pipe is vertically disposed on the lower side of the other end of the collection box. The collection box is provided with a discharge trough that connects the collection groove and the discharge pipe. The discharge pipe can guide the discharged impurities into the drain port.

[0013] As a further aspect of the present invention: a third synchronous belt structure is coaxially provided on the first rotating rod. The vertical cross-section of the third synchronous belt structure is triangular. One end of the third synchronous belt structure is provided with a first transmission rod coaxially connected to the screw conveyor, so that the drive motor and the first rotating rod cooperate to control the two screw conveyors to perform conveying work through the third synchronous belt structure and the first transmission rod.

[0014] As a further aspect of the present invention: the collection box is provided with an auxiliary component for assisting in the conveying of impurities. The collection box has an auxiliary cavity that matches the auxiliary component, so that the auxiliary component can tap and vibrate the collection box to prevent impurities in the collection trough from adhering and accumulating. The auxiliary component includes a rotating roller symmetrically rotated in the auxiliary cavity and several auxiliary rings disposed on the rotating roller. Several first striking blocks aligned with the auxiliary cavity are movably disposed in the auxiliary cavity. The auxiliary rings are provided with protrusions that control the periodic lifting and lowering of the first striking blocks. Several connecting blocks are vertically disposed on one side of the first striking blocks. One end of each connecting block is provided with a guide block that extends into the collection box. The collection box is provided with several guide rods that are guided and connected to the guide blocks. A buffer spring that is elastically connected to the guide block is sleeved on the guide rod.

[0015] As a further aspect of the present invention: the auxiliary component further includes a first protective box disposed in the filter seat and aligned with the first transmission rod, and a first main gear disposed in the first protective box and sleeved on the first transmission rod. The auxiliary component further includes a first transmission gear disposed on the lower side of the first protective box and meshing with the first main gear, and a first rotating gear meshing with the first transmission gear. A rotating rod coaxially connected to the first rotating gear is symmetrically rotatably disposed on the first protective box, and one end of the rotating rod is coaxially connected to the rotating roller. The diameters of the first main gear, the first transmission gear, and the first rotating gear decrease sequentially.

[0016] As a further aspect of the present invention: the collection box is provided with a feeding assembly for use with the discharge pipe. The feeding assembly includes a rotating block symmetrically and movably disposed in the filter seat to assist the discharge pipe in feeding, and a second striking block arranged in a circular array on the rotating block. One end of the rotating block is coaxially provided with a first bevel gear structure via a first connecting rod, and the other end of the first bevel gear structure is coaxially provided with a second bevel gear structure via a second connecting rod. One end of the spiral conveyor is provided with a second transmission rod extending into the collection box, and the other end of the second transmission rod is coaxially connected to the second bevel gear structure, so that when the spiral conveyor is working, the rotating block controls the second striking block to assist the discharge pipe in feeding.

[0017] As a further aspect of the present invention: the feeding assembly further includes a feeding scraper rotatably disposed in the feeding trough and a feeding auger disposed in the discharge pipe. The feeding scraper cleans the inner wall of the feeding trough, and the bottom end of the feeding scraper is coaxially connected to the top end of the feeding auger. The feeding scraper includes a rotating frame disposed in the middle of the feeding trough and a scraper connected to the rotating frame.

[0018] As a further aspect of the present invention: the feeding assembly further includes a second protective box disposed on the upper inner side of the collection box and a second rotating rod rotatably disposed on the second protective box and coaxially connected to the feeding scraper; the feeding assembly further includes a second rotating gear rotatably disposed in the second protective box and coaxially connected to the second rotating rod and a second main gear rotatably disposed on the other side of the second protective box, the second main gear being coaxially provided with a third transmission rod passing through the second protective box and coaxially connected to the second bevel gear structure, and a second transmission gear being rotatably disposed in the second protective box, respectively meshing with the second rotating gear and the second main gear, such that the second main gear, the second transmission gear and the second rotating gear cooperate to control the rotation of the feeding scraper and the feeding auger through the second bevel gear structure; the diameters of the second main gear, the second transmission gear and the second rotating gear decrease sequentially.

[0019] As a further aspect of the present invention: a pressure-controlled nitrogen recovery and circulation process, comprising the following steps: S1. The pressure inside the product storage tank is monitored by using a pressure gauge and pipeline assembly. The nitrogen in the product storage tank is purified by a purification box and then recovered to the nitrogen storage tank. S2. Monitor the pressure inside the product storage tank using pressure gauges and pipeline components, and transport nitrogen from the nitrogen storage tank to the product storage tank for nitrogen replenishment. S3. When the pressure of the nitrogen storage tank exceeds the safety threshold, or when the product storage tank or pipeline components malfunction, the excess gas is introduced into the purification box for purification and then discharged directly. S4. The purification box performs initial filtration of the mixed gas through the first synchronous belt structure and the filter screen belt, and cleans the outer impurities of the filter screen belt through the second synchronous belt structure and the knocking roller. S5, the cleaning roller and cleaning brush sleeve work together to clean the inner impurities of the filter belt, and the second scraper cleans the cleaning brush sleeve, so that the collection box collects the impurities; S6. The collection box conveys impurities through a spiral conveyor and auxiliary components, and discharges the impurities into the drain outlet inside the purification box through a scraper, a spiral conveyor, and a second impact block.

[0020] Compared with the prior art, the beneficial effects of the present invention are: (1) The pressure-controlled nitrogen recovery and circulation process adopted in this invention uses nitrogen storage tank, product storage tank, purification box, fine filter element, adsorption component, support base, filter base, filter mesh belt and pipeline assembly in combination. When the product storage tank receives material and the temperature rises, causing the pressure to rise, the gas in the tank is actively drawn out. There is no need to rely on the breather valve to passively release pressure, which avoids the impact of drastic pressure fluctuations in the tank on the storage tank and related equipment. It ensures that the pressure in the storage tank is always within the safe threshold range. When the storage tank is discharged or the temperature drops and nitrogen needs to be replenished, it is replenished as needed. When an emergency such as overpressure of the nitrogen storage tank occurs, the gas can directly enter the adsorption unit for efficient adsorption treatment, ensuring that the tail gas quickly meets the emission standards. It avoids the safety hazards of equipment damage and gas leakage caused by overpressure, improves the adaptability and operational reliability of the device under complex working conditions, reduces operation and maintenance costs and human risks, and improves the use effect of nitrogen recovery and circulation process.

[0021] (2) The present invention, through the setting of cleaning components and collection components, and the cooperation of support base, filter base, filter screen belt, first synchronous belt structure and connecting belt, can filter particulate impurities in mixed gas, extend the service life of fine filter element and adsorption element, and clean impurities adhering to the outer surface of filter screen belt through the cooperation of first scraper, knocking roller, knocking strip and second synchronous belt structure, and clean impurities adhering to the inner surface of filter screen belt through the cooperation of cleaning roller, cleaning brush sleeve, drive motor and first rotating rod, thus extending the service life of filter screen belt, and collecting the cleaned impurities through the cooperation of second scraper, connecting strip, connecting rod, support spring and collection box, thus avoiding secondary pollution of filter screen belt, improving the filtration effect of purification mechanism and improving the use effect of nitrogen recovery and circulation device.

[0022] (3) The present invention, through the setting of the collection component and the feeding component, the collection box, the spiral conveyor and the third synchronous belt structure are used in combination to transport the collected impurities to the discharge pipe. The first transmission rod, the rotating roller, the auxiliary ring, the first striking block, the first protective box, the first main gear, the first transmission gear and the first rotating gear are used to assist in the conveying of impurities in the collection box. The rotating block, the second striking block, the first bevel gear structure, the second bevel gear structure and the second transmission rod are used to strike the discharge pipe to prevent impurities from adhering to the inner wall of the discharge pipe. The feeding scraper, the feeding spiral, the second rotating rod, the second rotating gear, the second main gear, the third transmission rod and the second transmission gear are used to feed the discharge pipe to prevent impurities from clogging the discharge pipe. Thus, the collection component and the feeding component work together to clean the impurities inside the filter seat to the drain port, improve the collection and feeding effect of the collection component and the feeding component, and improve the use effect of the nitrogen recovery and circulation device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is a cross-sectional view of the purification box in this invention.

[0025] Figure 3 This is a partial structural diagram of the filtering component in this invention.

[0026] Figure 4 This is a partial structural diagram of the filter belt and the first synchronous belt structure in this invention.

[0027] Figure 5 This is a partial structural diagram of the cleaning component in this invention.

[0028] Figure 6 This is a partial structural diagram of the cleaning component and the collecting component in this invention.

[0029] Figure 7 This is a partial structural diagram of the second scraper and connecting strip in this invention.

[0030] Figure 8 This is a partial structural diagram of the collecting components in this invention.

[0031] Figure 9 In this invention Figure 8 Enlarged view of the structure at point A in the middle.

[0032] Figure 10 This is a partial structural diagram of the feeding assembly in this invention.

[0033] Figure 11 This is a partial structural diagram of the screw conveyor and the unloading screw in this invention.

[0034] Figure 12 This is a schematic diagram of the nitrogen recovery and recycling process in this invention.

[0035] In the diagram: 1. Nitrogen storage tank; 2. Product storage tank; 3. Purification box; 4. Divider plate; 5. Air inlet plate; 6. Fine filter element; 7. Adsorption element; 8. Support base; 9. Filter base; 10. Filter mesh belt; 11. Drain outlet; 12. First adapter; 13. Second adapter; 14. First air inlet pipe; 15. Second air inlet pipe; 16. First exhaust hood; 17. Second exhaust hood; 18. Return pipe; 19. Exit pipe; 20. Third air inlet pipe; 21. One-way valve; 22. First synchronous belt structure; 23. Connecting belt; 24. First scraper; 25. Striking roller; 26. Striking strip; 27. Second synchronous belt structure; 28. Cleaning roller; 29. ​​Cleaning brush sleeve; 30. Drive motor; 31. First rotating rod; 32. Second scraper; 33. Connecting strip; 34. Connecting rod; 35. 36. Support spring; 37. Collection box; 38. Screw conveyor; 39. Third synchronous belt structure; 40. First transmission rod; 41. Rotating roller; 42. Auxiliary ring; 43. First striking block; 44. Guide block; 45. Guide rod; 46. Buffer spring; 47. First protective box; 48. First main gear; 49. First transmission gear; 50. First rotating gear; 51. Rotating rod; 52. Second striking block; 53. First bevel gear structure; 54. Second bevel gear structure; 55. Second transmission rod; 56. Discharge scraper; 57. Discharge screw; 58. Second protective box; 59. Second rotating rod; 60. Second rotating gear; 61. Second main gear; 62. Third transmission rod; 63. Second transmission gear; 64. Pressure gauge; 65. Discharge pipe. Detailed Implementation

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1 Please see Figures 1-4This application provides a pressure-controlled nitrogen recovery and circulation device, comprising a nitrogen storage tank 1 and a product storage tank 2 connected to the nitrogen storage tank 1. A purification mechanism for purifying the gas in the product storage tank 2 is provided on the other side of the product storage tank 2. Pipe assemblies are interconnected between the nitrogen storage tank 1, the product storage tank 2, and the purification mechanism. The purification mechanism includes a purification chamber 3, a partition plate 4 vertically disposed in the middle of the purification chamber 3, and an air inlet plate 5 horizontally disposed in the lower inner side of the purification chamber 3. The bottom end of the partition plate 4 is aligned with the middle of the upper end face of the air inlet plate 5. The air inlet plate 5 divides the internal space of the purification chamber 3 into an upper purification chamber and a lower filtration chamber. The partition plate 4 evenly divides the upper purification chamber. The purification mechanism also includes a fine filter element 6 disposed from bottom to top in the upper purification chamber and an adsorption device used in conjunction with the fine filter element 6. Component 7, the adsorption component 7 can adsorb oil and moisture in the mixed gas, and the lower filter chamber is provided with a filter assembly for preliminary filtration of the gas; the filter assembly includes a support base 8 vertically arranged in the lower filter chamber and a filter seat 9 symmetrically inclined in the lower filter chamber. One end of the filter seat 9 is connected to the support base 8, and the upper end of the support base 8 is vertically connected to the middle of the lower end face of the air inlet plate 5. A filter screen belt 10 for preliminary filtration of the gas is movably arranged in the filter seat 9, and a conveyor roller that matches the filter screen belt 10 is provided in the filter seat 9. The outer surface of the conveyor roller is provided with an anti-stick coating; the bottom end of the purification box 3 is provided with a drain port 11 that communicates with the lower filter chamber, and the purification box 3 is provided with a drain pipe that communicates with the drain port 11. The filter seat 9 is inclined downward towards the side closer to the support base 8, and the support base 8 is provided with a connecting groove that matches the filter seat 9.

[0038] In this embodiment, the nitrogen storage tank 1, the product storage tank 2, and the purification box 3 are connected by a pipeline assembly. When the mixed gas in the product storage tank 2 enters the purification box 3, the particulate impurities in the filter screen belt 10 on the filter seat 9 are filtered. The filtered mixed gas enters the fine filter element 6 to filter fine impurities again, and the adsorption element 7 adsorbs other impurities in the mixed gas, so that the organic gas concentration is <0.05% and the N2 purity is >99.5%.

[0039] In this invention, a nitrogen storage tank 1 is provided with a first adapter 12, and a product storage tank 2 is provided with a second adapter 13. Both the first adapter 12 and the second adapter 13 are equipped with gas valves. The gas valves on the nitrogen storage tank 1 are capable of pressure regulation. The piping assembly includes a first air inlet pipe 14 connected to the first adapter 12 and the second adapter 13, and a second air inlet pipe 15 disposed on the second adapter 13 and connected to the purification chamber 3. The purification chamber 3 is symmetrically provided with a first exhaust hood 16 and a second exhaust hood 17. The first exhaust hood 16 is provided with a return air pipe 18 communicating with the first adapter 12, and the second exhaust hood 17 is provided with a return air pipe 18 communicating with the first adapter 12. The first air inlet pipe 14, the second air inlet pipe 15, the return air pipe 18, the air outlet pipe 19 and the third air inlet pipe 20 are connected to the purification box 3. The third air inlet pipe 20 is connected to the purification box 3 and the air outlet pipe 19. An emergency discharge pipeline valve is provided on the third air inlet pipe 20. One-way valves 21 are provided on the first air inlet pipe 14, the second air inlet pipe 15, the return air pipe 18, the air outlet pipe 19 and the third air inlet pipe 20. Pressure gauges 64 are provided on the first adapter 12 and the second adapter 13. Pressure gauges 64 are equipped with pressure sensors and controllers that work with the pressure sensors. The pressure gauges 64 are set with recovery start threshold and replenishment start threshold.

[0040] In this invention, due to the entry of receiving materials and the increase in ambient temperature, the gas in the gas phase space of product storage tank 2 expands, and the pressure gradually rises. When the pressure reaches the recovery start threshold, the pressure sensor sends a signal to the controller, causing the mixed gas in product storage tank 2 to enter the purification tank 3 through the second air inlet pipe 15. After purification by the purification mechanism, the treated gas must meet the following indicators: organic gas concentration <0.05%, N2 purity >99.5%. At this time, because the system operating pressure is stable at 0.8-1.5MPa, the purified high-pressure nitrogen does not need to be pressurized by a compressor. After being adjusted to the appropriate pressure in nitrogen storage tank 1 by the pressure regulating valve, it is directly sent into the tank for storage. When the pressure in product storage tank 2 drops to the recovery stop threshold, the controller closes the pipeline assembly, and the recovery process ends. As the output and ambient temperature decrease, the gas phase space inside the tank shrinks, and the pressure gradually decreases. When the pressure reaches the replenishment start threshold, the pressure sensor sends a signal to the controller, causing the nitrogen storage tank 1 to adjust the high-purity nitrogen to a pressure matching that of the product storage tank 2 through the gas valve and the first inlet pipe 14, and deliver it to the product storage tank 2. When the pressure of the product storage tank 2 rises to the replenishment stop threshold, the controller closes the pipeline assembly, and the replenishment process ends. When the pressure of the nitrogen storage tank exceeds the safety threshold, or when the product storage tank 2 and the pipeline assembly malfunction, causing the normal recovery / replenishment process to fail, the controller introduces the excess gas into the purification box 3 through the third inlet pipe 20 for purification treatment, and then directly discharges the purified gas to the outside. After the system pressure returns to the safe range, the third inlet pipe 20 and the outlet pipe 19 are closed.

[0041] The filter assembly of the present invention further includes a first synchronous belt structure 22 disposed in the filter seat 9 and controlling the movement of the filter screen belt 10, and a connecting belt 23 aligning and connecting the first synchronous belt structure 22 with the filter screen belt 10. The filter seat 9 is provided with a movable groove that fits with the connecting belt 23. Both the upper and lower sides of the connecting belt 23 are provided with sealing strips that seal with the movable groove. The filter screen belt 10, the first synchronous belt structure 22 and the connecting belt 23 are all configured as conveyor belts. The filter seat 9 is provided with a cleaning assembly for cleaning the filter screen belt 10.

[0042] In this embodiment, the first synchronous belt structure 22 is activated, which drives the connecting belt 23 to move, which in turn drives the filter belt 10 to move, so that the filter belt 10 filters the mixed gas and adjusts the filter surface of the filter belt 10 to extend the working cycle of the filter belt 10.

[0043] Example 2 Based on Example 1, referring to Figures 4-7 This is the second embodiment of the present invention. In this embodiment, the cleaning component includes a plurality of first scraper strips 24 vertically disposed on the lower inner side of the filter seat 9 for cleaning the filter belt 10 and a striking roller 25 rotatably disposed on the inner side of the filter seat 9 for knocking and cleaning the filter belt 10. The striking roller 25 is provided with striking strips 26 for knocking the lower side of the filter belt 10. The cleaning component also includes a second synchronous belt structure 27 coaxially connected to the striking roller 25. One end of the second synchronous belt structure 27 is coaxially connected to one end of the first synchronous belt structure 22.

[0044] In this embodiment, when the first synchronous belt structure 22 is working, it drives the second synchronous belt structure 27 to work, which in turn drives the tapping roller 25 to rotate. The tapping roller 25 then drives the tapping strip 26 to rotate, causing the tapping strip 26 to tap and clean the lower side of the filter belt 10. Additionally, several first scraper strips 24 work together to clean impurities from the filter belt 10. The combined action of the tapping strip 26 and the first scraper strips 24 improves the cleaning effect of the filter belt 10.

[0045] The cleaning assembly of the present invention further includes a cleaning roller 28 rotatably disposed on the upper inner side of the filter seat 9 and attached to the upper side of the filter belt 10. The cleaning roller 28 can tension the filter belt 10. The cleaning roller 28 is fitted with a cleaning brush sleeve 29 for cleaning the inner side of the filter belt 10. A drive motor 30 for controlling the rotation of the cleaning roller 28 is provided on the outer side of the filter seat 9. A first rotating rod 31 coaxially connected to the cleaning roller 28 is provided on the output shaft of the drive motor 30.

[0046] In this embodiment, the drive motor 30 is started, which drives the first rotating rod 31 to rotate, so that the first rotating rod 31 drives the cleaning roller 28 to rotate, so that the cleaning roller 28 assists in tensioning the filter belt 10, and cleans the impurities on the inner side of the filter belt 10 through the cleaning brush sleeve 29.

[0047] In this invention, the lower side of the cleaning roller 28 is movably provided with a second scraper 32 for cleaning the cleaning brush sleeve 29 and a connecting strip 33 aligned with the second scraper 32; the bottom end of the second scraper 32 is provided with a plurality of connecting rods 34 extending into the interior of the connecting strip 33, and the connecting strip 33 is provided with a support spring 35 connected to the connecting rod 34. The connecting rod 34 and the support spring 35 cooperate to make the second scraper 32 fit against the cleaning brush sleeve 29.

[0048] In this embodiment, when the cleaning brush sleeve 29 cleans the impurities on the inner side of the filter belt 10, the second scraper 32 cleans the impurities on the cleaning brush sleeve 29, and through the cooperation of the connecting rod 34 and the support spring 35, the second scraper 32 is tightly attached to the outer wall of the cleaning brush sleeve 29.

[0049] Example 3 Based on Example 2, referring to Figures 6-11 This is the third embodiment of the present invention. In this invention, the filter seat 9 is provided with a collection assembly for collecting and processing the impurities cleaned by the second scraper 32. The collection assembly includes a collection box 36 disposed inside the filter seat 9 and spiral conveyors 37 symmetrically and movably disposed in the collection box 36. The inner side of the collection box 36 is provided with a collection groove that cooperates with the two spiral conveyors 37. The upper end of the collection box 36 is provided with a collection port that cooperates with the second scraper 32. A connecting strip 33 is disposed in the collection port, so that the second scraper 32 cleans the impurities on the second scraper 32 into the collection box 36. The side of the collection box 36 near the first synchronous belt structure 22 is fixed to the inner wall of the filter seat 9. The other end of the collection box 36 extends into the interior of the filter seat 9. A discharge pipe 65 is vertically disposed on the lower side of the other end of the collection box 36. The collection box 36 is provided with a discharge groove that connects the collection groove and the discharge pipe 65. The discharge pipe 65 can guide the discharged impurities into the drain port 11.

[0050] In this embodiment, when the second scraper 32 cleans the impurities on the cleaning brush sleeve 29 and guides the cleaned impurities into the collection box 36, the collection groove in the collection box 36 collects the impurities, and controls the spiral conveyor 37 to rotate, so that the spiral conveyor 37 transports the impurities to the discharge trough and guides them into the discharge pipe 65, thereby guiding the impurities inside the filter seat 9 into the drain outlet 11 through the discharge pipe 65.

[0051] In this invention, a third synchronous belt structure 38 is coaxially provided on the first rotating rod 31. The vertical cross section of the third synchronous belt structure 38 is triangular. One end of the third synchronous belt structure 38 is provided with a first transmission rod 39 coaxially connected to the screw conveyor 37, so that the drive motor 30 and the first rotating rod 31 cooperate to control the two screw conveyors 37 to perform conveying work through the third synchronous belt structure 38 and the first transmission rod 39.

[0052] In this embodiment, when the drive motor 30 is started and the first rotating rod 31 is driven to rotate, the first rotating rod 31 drives the third synchronous belt structure 38 to work, and the third synchronous belt structure 38 drives the two first transmission rods 39 to rotate, and the first transmission rods 39 drive the spiral conveyor 37 to rotate.

[0053] In this invention, the collection box 36 is provided with an auxiliary component for assisting in the conveying of impurities. The collection box 36 has an auxiliary cavity that matches the auxiliary component, so that the auxiliary component can tap and vibrate the collection box 36 to prevent impurities in the collection tank from adhering and accumulating. The auxiliary component includes a rotating roller 40 symmetrically rotated in the auxiliary cavity and several auxiliary rings 41 disposed on the rotating roller 40. Several first striking blocks 42 are movably disposed in the auxiliary cavity and aligned with the auxiliary cavity. The auxiliary rings 41 are provided with protrusions that control the periodic lifting and lowering of the first striking blocks 42. Several connecting blocks are vertically disposed on one side of the first striking block 42. One end of the connecting block is provided with a guide block 43 that extends into the collection box 36. The collection box 36 is provided with several guide rods 44 that are guided and connected to the guide blocks 43. A buffer spring 45 that is elastically connected to the guide blocks 43 is sleeved on the guide rods 44.

[0054] In this embodiment, when the rotating roller 40 rotates, it causes the auxiliary ring 41 to rotate, which in turn causes the protrusion to rotate. The protrusion controls the first striking block 42 to move upward, and causes the first striking block 42 to strike the inner top surface of the auxiliary cavity, thereby preventing impurities in the collection box 36 from adhering and accumulating. When the first striking block 42 moves up and down, the connecting block causes the guide block 43 to move on the guide rod 44, which in turn causes the guide block 43 to extend and retract the buffer spring 45.

[0055] The auxiliary components of this invention also include a first protective box 46 disposed in the filter seat 9 and aligned with the first transmission rod 39, and a first main gear 47 disposed in the first protective box 46 and sleeved on the first transmission rod 39. The auxiliary components also include a first transmission gear 48 disposed on the lower side of the first protective box 46 and meshing with the first main gear 47, and a first rotating gear 49 meshing with the first transmission gear 48. A rotating rod 50 is symmetrically rotatably disposed on the first protective box 46 and coaxially connected to the first rotating gear 49. One end of the rotating rod 50 is coaxially connected to the rotating roller 40. The diameters of the first main gear 47, the first transmission gear 48, and the first rotating gear 49 decrease sequentially.

[0056] In this embodiment, when the first transmission rod 39 drives the spiral conveyor 37 to rotate, the first transmission rod 39 drives the first main gear 47 to rotate, the first main gear 47 drives the first transmission gear 48 to rotate, the first transmission gear 48 drives the first rotating gear 49 to rotate, the first rotating gear 49 drives the rotating rod 50 to rotate, the rotating rod 50 drives the rotating roller 40 to rotate, and the rotating roller 40 assists in conveying impurities through the auxiliary ring 41 and the first striking block 42.

[0057] In this invention, the collection box 36 is provided with a feeding assembly that works in conjunction with the discharge pipe 65. The feeding assembly includes a rotating block 51 symmetrically and movably disposed in the filter seat 9 to assist the feeding of the discharge pipe 65, and a second striking block 52 arranged in a circular array on the rotating block 51. One end of the rotating block 51 is coaxially provided with a first bevel gear structure 53 via a first connecting rod, and the other end of the first bevel gear structure 53 is coaxially provided with a second bevel gear structure 54 via a second connecting rod. One end of the spiral conveyor 37 is provided with a second transmission rod 55 that extends into the collection box 36, and the other end of the second transmission rod 55 is coaxially connected to the second bevel gear structure 54, so that when the spiral conveyor 37 is working, the second striking block 52 is controlled by the rotating block 51 to assist the feeding of the discharge pipe 65.

[0058] In this embodiment, when the screw conveyor 37 is working, it drives the second transmission rod 55 to rotate, the second transmission rod 55 drives the second bevel gear structure 54 to rotate, the second bevel gear structure 54 drives the first bevel gear structure 53 to rotate through the second connecting rod, the first bevel gear structure 53 drives the rotating block 51 to rotate through the first connecting rod, and the rotating block 51 drives the second striking block 52 to strike the discharge pipe 65 to assist the discharge pipe 65 in discharging materials.

[0059] The feeding assembly of the present invention further includes a feeding scraper 56 rotatably disposed in the feeding trough and a feeding auger 57 disposed in the discharge pipe 65. The feeding scraper 56 cleans the inner wall of the feeding trough, and the bottom end of the feeding scraper 56 is coaxially connected to the top end of the feeding auger 57. The feeding scraper 56 includes a rotating frame disposed in the middle of the feeding trough and a scraper connected to the rotating frame.

[0060] In this embodiment, when the discharge pipe 65 discharges material, the discharge scraper 56 rotates to clean the impurities on the inner wall of the discharge trough. The rotation of the discharge scraper 56 drives the discharge auger 57 to rotate, thereby cleaning the impurities in the discharge pipe 65.

[0061] The feeding assembly of this invention further includes a second protective box 58 disposed on the upper inner side of the collection box 36 and a second rotating rod 59 rotatably disposed on the second protective box 58 and coaxially connected to the feeding scraper 56; the feeding assembly also includes a second rotating gear 60 rotatably disposed in the second protective box 58 and coaxially connected to the second rotating rod 59 and a second main gear 61 rotatably disposed on the other side of the second protective box 58. The second main gear 61 is coaxially provided with a third transmission rod 62 that passes through the second protective box 58 and is coaxially connected to one of the second bevel gear structures 54. The second protective box 58 is rotatably provided with a second transmission gear 63 that meshes with the second rotating gear 60 and the second main gear 61 respectively, so that the second main gear 61, the second transmission gear 63 and the second rotating gear 60 cooperate to control the rotation of the feeding scraper 56 and the feeding auger 57 through the second bevel gear structure 54; the diameter of the second main gear 61, the second transmission gear 63 and the second rotating gear 60 decreases sequentially.

[0062] In this embodiment, when the screw conveyor 37 is working, it drives the second transmission rod 55 to rotate, which in turn drives the second bevel gear structure 54 to rotate. The second bevel gear structure 54 then drives the third transmission rod 62 to rotate, which in turn drives the second main gear 61 to rotate. This causes the second main gear 61 to drive the second transmission gear 63 to rotate, which in turn drives the second rotating gear 60 to rotate. This causes the second rotating gear 60 to drive the second rotating rod 59 to rotate, which in turn drives the feeding scraper 56 and the feeding screw 57 to rotate.

[0063] Example 4 Based on Example 3, referring to Figure 12 This is the fourth embodiment of the present invention, wherein a pressure-controlled nitrogen recovery and circulation process includes the following steps: S1. The pressure inside the product storage tank 2 is monitored by pressure gauge 64 and pipeline assembly. The nitrogen in the product storage tank 2 is purified by purification box 3 and then recovered to nitrogen storage tank 1. S2. Monitor the pressure inside the product storage tank 2 using pressure gauge 64 and pipeline assembly, and transport nitrogen from nitrogen storage tank 1 to product storage tank 2 for nitrogen replenishment. S3. When the pressure of nitrogen storage tank 1 exceeds the safety threshold, or when product storage tank 2 or pipeline components malfunction, the excess gas is introduced into purification box 3 for purification and then discharged directly. S4. The purification box 3 performs initial filtration of the mixed gas through the first synchronous belt structure 22 and the filter screen belt 10, and cleans the outer impurities of the filter screen belt 10 through the cooperation of the second synchronous belt structure 27 and the knocking roller 25. S5, the cleaning roller 28 and the cleaning brush sleeve 29 work together to clean the inner impurities of the filter belt 10, and the second scraper 32 cleans the cleaning brush sleeve 29, and the collection box 36 collects the impurities. S6, the collection box 36 conveys impurities through the spiral conveyor 37 and auxiliary components, and discharges the impurities into the drain outlet 11 in the purification box 3 through the discharge scraper 56, the discharge spiral 57 and the second knocking block 52 auxiliary discharge pipe 65.

[0064] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A pressure-controlled nitrogen recovery and circulation device, comprising a nitrogen storage tank and a product storage tank connected to the nitrogen storage tank, characterized in that, Also includes: The purification chamber is connected to the nitrogen storage tank and the product storage tank via piping components. The first adapter and the second adapter are both equipped with pressure gauges at their upper ends. The first adapter is installed on the nitrogen storage tank, and the second adapter is installed on the product storage tank. A partition plate divides the interior of the purification box. An air inlet plate is provided at the lower end of the partition plate. Fine filter elements and adsorption elements that work in conjunction with the fine filter elements are provided on both sides of the partition plate. A support base is vertically installed at the lower end of the air intake plate. The support base is symmetrically provided with inclined upward filter seats, and a filter mesh belt is movably installed on the filter seats.

2. The pressure-controlled nitrogen recovery and circulation device according to claim 1, characterized in that, The piping assembly includes: The first air intake pipe has its two ends connected to the first adapter and the second adapter, respectively; The second and third air inlet pipes are connected at both ends to the second adapter and the purification box, respectively. Both the return gas pipe and the outlet gas pipe are installed on the purification box, and the return gas pipe is connected to the nitrogen storage tank; The purification box is symmetrically provided with a first exhaust hood and a second exhaust hood on its upper part; The exhaust pipe is installed on the second exhaust hood; The third air inlet pipe is connected to the purification box and the air outlet pipe; One-way valves are provided on the first air inlet pipe, the second air inlet pipe, the return air pipe, the air outlet pipe, and the third air inlet pipe; Both the first and second adapters are equipped with pressure gauges.

3. The pressure-controlled nitrogen recovery and circulation device according to claim 1, characterized in that, The inner side of the filter base is provided with a first synchronous belt structure for controlling the movement of the filter mesh belt; The first synchronous belt structure is aligned and connected to the filter belt via a connecting belt; The connecting strip is sealed and fitted onto the filter base; The lower inner side of the filter seat is vertically provided with a first scraper for cleaning the filter belt; The filter seat is equipped with a rotatable roller in the middle of its inner side to clean the filter belt by striking it. The striking roller is provided with striking strips to strike the underside of the filter belt; The striking roller is connected to the first synchronous belt structure via a second synchronous belt structure that is aligned.

4. The pressure-controlled nitrogen recovery and circulation device according to claim 3, characterized in that, The filter seat has a cleaning roller attached to the upper side of the filter belt on the inner side of the upper part. The cleaning roller sleeve is equipped with a cleaning brush sleeve for cleaning the inner side of the filter belt; The filter base is equipped with a drive motor on its outer side to control the rotation of the cleaning roller; The output shaft of the drive motor is provided with a first rotating rod that is coaxially connected to the cleaning roller. The cleaning roller is provided with a second scraper on its lower side for cleaning the cleaning brush sleeve; The second scraper is movably connected to the connecting strip via several connecting strips; The connecting strip is equipped with a support spring that connects to the connecting rod.

5. The pressure-controlled nitrogen recovery and circulation device according to claim 4, characterized in that, The filter base is provided with a collection box for use with the second scraper; The collection box is symmetrically equipped with spiral conveyors for conveying impurities; The collection box is fixed to the inner wall of the filter seat on the side closest to the first synchronous belt structure; The other end of the collection box extends into the interior of the filter seat; The other end of the collection box is vertically provided with a discharge pipe on its lower side. The collection box is equipped with a discharge trough that communicates with the discharge pipe, and works with the collection box and the discharge pipe to guide the cleaned impurities into the lower inner side of the purification box. A third synchronous belt structure is coaxially provided on the first rotating rod; One end of the third synchronous belt structure is provided with a first transmission rod coaxially connected to the screw conveyor, so that the drive motor and the first rotating rod cooperate to control the two screw conveyors to perform conveying work through the third synchronous belt structure and the first transmission rod.

6. The pressure-controlled nitrogen recovery and circulation device according to claim 5, characterized in that, The collection box is symmetrically provided with auxiliary cavities; The auxiliary cavity is equipped with a rotating roller; The rotating roller is provided with several auxiliary ring components; The auxiliary cavity is equipped with a plurality of first striking blocks that are aligned with the auxiliary cavity. The auxiliary ring is provided with a protrusion that controls the periodic lifting and lowering of the first striking block; The first striking block is provided with a guide block that is connected to the collection box via a connecting block; The collection box is equipped with a buffer spring that is elastically connected to the guide block.

7. The pressure-controlled nitrogen recovery and circulation device according to claim 6, characterized in that, The filter base is provided with a first protective box that is aligned with the first transmission rod. The first protective box is equipped with a first main gear that is coaxially connected to the first transmission rod; The first main gear meshes with a first rotating gear through a first transmission gear; The first rotating gear is coaxially connected to the rotating roller via a rotating rod.

8. The pressure-controlled nitrogen recovery and circulation device according to claim 5, characterized in that, The filter base is symmetrically equipped with rotating blocks that assist in feeding material from the discharge pipe. The rotating block is provided with a second striking block arranged in a circular array; One end of the rotating block is coaxially provided with a first bevel gear structure via a first connecting rod; The other end of the first bevel gear structure is coaxially provided with a second bevel gear structure via a second connecting rod. One end of the spiral conveyor is provided with a second transmission rod that extends into the collection box; The other end of the second transmission rod is coaxially connected to the second bevel gear structure, so that when the screw conveyor is working, the rotating block controls the second striking block to assist in feeding the material through the discharge pipe. The collection box is equipped with a rotating scraper to clean the feeding trough; The discharge pipe is equipped with a discharge auger that is coaxially connected to the discharge scraper.

9. A pressure-controlled nitrogen recovery and circulation device according to claim 8, characterized in that, A second protective box is provided on the upper inner side of the collection box; The second protective box is rotatably equipped with a second rotating rod that is coaxially connected to the feeding scraper; The second protective box is equipped with a second rotating gear that is coaxially connected to the second rotating rod; The second rotating gear meshes with the second main gear via the second transmission gear; The second main gear is coaxially provided with a third transmission rod that passes through the second protective box; The bottom end of the third transmission rod is coaxially connected to the second bevel gear structure; The second main gear, the second transmission gear, and the second rotary gear work together to control the rotation of the feeding scraper and the feeding auger through the second bevel gear structure.

10. A pressure-controlled nitrogen recovery and circulation process, comprising a pressure-controlled nitrogen recovery and circulation device according to any one of claims 1-9, characterized in that, Includes the following steps: S1. The pressure inside the product storage tank is monitored by using a pressure gauge and pipeline assembly. The nitrogen in the product storage tank is purified by a purification box and then recovered to the nitrogen storage tank. S2. Monitor the pressure inside the product storage tank using pressure gauges and pipeline components, and transport nitrogen from the nitrogen storage tank to the product storage tank for nitrogen replenishment. S3. When the pressure of the nitrogen storage tank exceeds the safety threshold, or when the product storage tank or pipeline components malfunction, the excess gas is introduced into the purification box for purification and then discharged directly. S4. The purification box performs initial filtration of the mixed gas through the first synchronous belt structure and the filter screen belt, and cleans the outer impurities of the filter screen belt through the second synchronous belt structure and the knocking roller. S5, the cleaning roller and cleaning brush sleeve work together to clean the inner impurities of the filter belt, and the second scraper cleans the cleaning brush sleeve, so that the collection box collects the impurities; S6. The collection box conveys impurities through a spiral conveyor and auxiliary components, and discharges the impurities into the drain outlet inside the purification box through a scraper, a spiral conveyor, and a second impact block.

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