A large atmospheric pressure low temperature liquid storage tank

Abstract

The present invention belongs to the technical field of liquid tank storage, and specifically relates to a large-scale atmospheric pressure low-temperature liquid storage tank, comprising an outer jacketed cylinder, an inner storage tank embedded in the cylinder, a vacuum insulation chamber arranged between the inner storage tank and the outer jacketed cylinder, a partition plate fixedly welded between the inner storage tank and the outer jacketed cylinder, the partition plate divides the vacuum insulation chamber into isolation chambers, a drain valve port and a steam exhaust valve port are respectively arranged at the end of the outer jacketed cylinder away from the opening; an inner sealing cover is sealingly installed between the inner storage tank and the outer jacketed cylinder, and is used to seal the isolation chamber; a liquefaction tank is arranged between the drain valve port and the steam exhaust valve port. The present invention can improve the thermal insulation performance of the low-temperature liquid storage tank, while reducing the probability of pearlescent sand inside the vacuum chamber changing to a different quality, thereby increasing its service life, and can recycle the vaporized low-temperature liquid during draining, thereby reducing the waste of resources.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid tank storage, and in particular relates to a large-scale normal-pressure low-temperature liquid storage tank. Background Art

[0002] Cryogenic liquid storage tanks, also known as cryogenic liquid tanks, are containers specially designed for storing or transporting gases that are liquefied at low temperatures. These gases usually include but are not limited to liquid oxygen, liquid nitrogen, liquid argon and liquefied natural gas (LNG).

[0003] According to different uses, cryogenic liquid tanks can be divided into two types: fixed and transportable. Fixed storage tanks are mainly used for long-term storage of cryogenic liquids at production sites, use points or supply stations. Transportable tanks are used to safely and efficiently transport cryogenic liquids from production sites or supply stations to the use site, and can be transported by land or water.

[0004] Traditional fixed cryogenic liquid storage tanks are generally double-layer structures, consisting of an outer jacketed cylinder and an inner storage tank nested inside it. A vacuum cavity is formed between the two for thermal insulation to ensure the storage of cryogenic liquids. Pearlescent sand is also filled in the vacuum cavity to improve thermal insulation performance.

[0005] However, the existing fixed cryogenic liquid storage tanks have the following defects when in use:

[0006] 1. The vacuum cavity formed inside the cryogenic liquid storage tank is generally connected as a whole. After the pearl sand is filled inside, it may sink after a period of use, resulting in space formed on the top of the container. The insulation effect is significantly reduced, causing "sweating" on the top of the outer cylinder of the storage tank. Moreover, it is not easy to observe at the top of the outer cylinder and it is difficult to find it in time. Once a problem occurs, it will cause a large amount of evaporation of cryogenic liquid and cause high pressure in the tank.

[0007] 2. Pearlescent sand is an insulating material used to fill storage tanks. If its particle size or temperature is not suitable, it may release water vapor after running for a period of time, resulting in reduced vacuum and increased evaporation. At this time, the pearlescent sand will agglomerate and the thermal insulation performance will be reduced. The pearlescent sand needs to be replaced, but it is troublesome to replace the pearlescent sand in the traditional integrally connected vacuum chamber. In addition, if agglomerations occur locally, replacing the entire chamber will also cause a waste of resources.

[0008] 3. When the cryogenic liquid is discharged, the evaporation gas generated due to the insulation problem will also flow out of the tank along with the discharge of the liquid, resulting in a waste of some cryogenic liquid. Summary of the invention

[0009] The purpose of the present invention is to provide a large-scale atmospheric pressure low-temperature liquid storage tank, which can improve the thermal insulation performance of the low-temperature liquid storage tank, while reducing the probability of pearl sand deterioration inside the vacuum chamber, thereby increasing its service life, and can recover the vaporized low-temperature liquid during drainage to reduce waste of resources.

[0010] The technical solution adopted by the present invention is as follows:

[0011] A large-scale atmospheric pressure low-temperature liquid storage tank, comprising:

[0012] An outer jacket cylinder, an inner storage tank is embedded in the inner part of the outer jacket cylinder, a vacuum insulation cavity is arranged between the inner storage tank and the outer jacket cylinder, a partition plate is fixedly welded between the inner storage tank and the outer jacket cylinder, the partition plate divides the vacuum insulation cavity into isolation cavities, the outer jacket cylinder is provided with a monitoring mechanism for monitoring the state in the isolation cavity, and a drain valve port and a steam exhaust valve port are respectively arranged at one end of the outer jacket cylinder away from the opening;

[0013] An inner sealing cover is sealingly installed between the inner storage tank and the outer jacket cylinder, and is used to seal the isolation chamber. The inner sealing cover is provided with a feeding port and an exhaust valve port. The exhaust valve port extends to one end of the isolation chamber and is provided with a vacuum tube. The vacuum tube extends to the other end of the isolation chamber.

[0014] An outer sealing flange cover is sealingly mounted at the opening of the outer jacket cylinder and covers the inner sealing cover, and is used for secondary sealing of the outer jacket cylinder and the inner storage tank;

[0015] A liquefaction tank is arranged between the liquid discharge valve port and the steam exhaust valve port, the top of the liquefaction tank is integrally formed with a steam inlet port, and the bottom is integrally formed with a liquid outlet port, the side of the liquid outlet port is integrally formed with a support pipe seat, an integrated pulse tube refrigerator is fixedly mounted on the support pipe seat, the cold end heat exchanger of the integrated pulse tube refrigerator is embedded in the liquefaction tank through the support pipe seat, and a slow-release mechanism for improving the liquefaction rate is also provided in the liquefaction tank;

[0016] The isolation chamber is formed by the partition plate and is sealed separately by the inner sealing cover. The internal state of the isolation chamber can be monitored in real time by a monitoring mechanism to promptly detect the phenomenon of moisture or agglomeration of the pearl sand, and then the pearl sand in each isolation chamber can be replaced separately. At the same time, the liquefaction tank and the integrated pulse tube refrigerator can liquefy part of the vaporized liquid when discharging the low-temperature liquid.

[0017] The monitoring mechanism includes a monitoring port corresponding to the isolation chamber and integrally formed on the outer jacket cylinder, a sealing cover plate sealed on the monitoring port, and a pressure sensor and a temperature and humidity sensor fixedly mounted on the sealing cover plate. The detection probes of the pressure sensor and the temperature and humidity sensor extend into the interior of the isolation chamber through the monitoring port.

[0018] The top of the outer surface of the outer jacket cylinder is also provided with a liquid inlet valve port and a detection port which are connected with the interior of the inner storage tank, and secondary protective covers are provided around the liquid inlet valve port and the detection port.

[0019] The steam inlet port is connected to the exhaust valve port through a pipeline, and the liquid outlet port is connected to a three-way pipe through a pipeline. The liquid inlet at one end of the three-way pipe is connected to the exhaust valve port, and the other liquid discharge hole is also connected to the discharge pipe for discharging low-temperature liquid.

[0020] The liquid discharge valve port is arranged at the bottom of the outer jacket cylinder, and the steam exhaust valve port is arranged at the top of the outer jacket cylinder, and the two are symmetrically arranged and communicated with the interior of the inner storage tank. The outer jacket cylinder is equipped with a pressure gauge for monitoring the internal pressure of the inner storage tank at that position to match the steam exhaust valve port and the liquid discharge valve port.

[0021] The slow-release mechanism includes a slow-release filter plate and a guide plate fixedly installed inside the liquefaction tank. The slow-release filter plate and the guide plate are arranged in an equidistant array inside the liquid outlet port and are respectively located on the upper and lower sides of the cold-end heat exchanger of the integrated pulse tube refrigerator.

[0022] The slow-release filter plate is in a funnel-cone shape, and the side wall is evenly provided with diffusion holes, and the bottom end of the slow-release filter plate is integrally formed with a sinking opening.

[0023] The guide plate is in an inverted funnel shape, and a liquid outlet is integrally formed on the top. A lower flow hole is arranged in a circular array on the outer periphery of the bottom of the guide plate.

[0024] It also includes a support frame for supporting the outer sleeve cylinder, wherein positioning feet are fixedly welded at both ends and four corners of the support frame, and the outer sleeve cylinder is embedded and installed between the positioning feet. A walking platform is fixedly installed on the top surface of the support frame on the top of the outer sleeve cylinder, and a guardrail frame is also fixedly installed on the walking platform. A climbing mechanism for workers to go up and down is provided at the notch of the guardrail frame.

[0025] The climbing mechanism includes a U-shaped frame arranged on one side of the guardrail frame opening, and a handrail rod, a first bottom support rod, and a second bottom support rod rotatably connected between the U-shaped frame and the guardrail frame. A folding pedal is rotatably installed between two parallel and opposite groups of the first bottom support rods and the second bottom support rods, and a telescopic cylinder for changing the folding state is arranged between the top end of the U-shaped frame and the first bottom support rod.

[0026] The technical effects achieved by the present invention are:

[0027] The present invention provides a partition plate between the outer jacket cylinder and the inner storage tank to equally divide the vacuum chamber into a plurality of isolation chambers, so that the pearlescent sand in the vacuum chamber is separated from each other, thereby greatly reducing its sedimentation amplitude, and no top space will appear, thereby improving the thermal insulation performance of the entire device, avoiding the "sweating" phenomenon on the top of the outer jacket cylinder, and ensuring the storage safety of the cryogenic liquid;

[0028] The present invention can seal each isolation chamber individually by arranging an inner sealing cover to cooperate with the isolation chamber, and at the same time use the sealing cover plate and the pressure sensor to monitor the internal state thereof, so as to accurately judge whether the pearl sand has been damp or agglomerated, so as to remove the inner sealing cover on the isolation chamber with the problem, and then clean the agglomerated pearl sand inside, refill the pearl sand, and evacuate the air again to restore the vacuum to the specified standard. Compared with the traditional structure, there is no need to replace the entire pearl sand, so the repair efficiency is higher, it is more convenient, and the waste of resources is reduced.

[0029] The present invention cooperates with an integrated pulse tube refrigerator by arranging a liquefaction tank. When discharging low-temperature liquid, the principle of floating of evaporated gas is utilized to discharge the low-temperature liquid into the liquefaction tank, and the integrated pulse tube refrigerator is utilized for heat exchange to reduce the internal temperature of the supporting tube seat, so that the vaporized liquid is liquefied again and flows back into the discharged low-temperature liquid through the liquid outlet port, and is discharged out of the tank body together so that it can be recycled and reused, thereby reducing the evaporation waste of the low-temperature liquid during discharge. At the same time, a slow-release filter plate is provided to cooperate with a guide plate to slowly release the flow of gas and liquid, so that the low-temperature liquid in a gas-liquid mixed state can fully contact with the cold end heat exchanger of the integrated pulse tube refrigerator, so that it can be fully liquefied, thereby improving the recovery rate of evaporated gas and reducing resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the combined structure of the outer jacket cylinder and the liquefaction tank according to an embodiment of the present invention;

[0032] Figure 3 The present invention Figure 2An exploded view of one end;

[0033] Figure 4 This is a schematic diagram of the internal structure of the outer jacket cylinder of an embodiment of the present invention;

[0034] Figure 5 is a partial side view of an embodiment of the present invention;

[0035] Figure 6 The present invention Figure 2 A front cross-sectional view of

[0036] Figure 7 The present invention Figure 2 A side cross-sectional view of

[0037] Figure 8 The present invention Figure 2 An exploded view of the other end;

[0038] Fig. 9 It is a structural schematic diagram of a liquefaction tank according to an embodiment of the present invention;

[0039] Fig.10 It is a partial structural diagram of a liquefied tank according to an embodiment of the present invention;

[0040] Fig.11 The present invention Fig.10 A side cross-sectional view of

[0041] Fig.12 It is a schematic diagram of a partial structure of a support frame according to an embodiment of the present invention;

[0042] Fig.13 The present invention Fig.12 A schematic diagram of a side view stereoscopic structure.

[0043] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0044] 1. Outer jacket cylinder; 2. Inner sealing cover; 3. Outer sealing flange cover; 4. Liquefaction tank; 5. Support frame;

[0045] 11. Inner storage tank; 12. Partition plate; 13. Isolation chamber; 14. Monitoring port; 15. Sealing cover plate; 16. Pressure sensor; 17. Temperature and humidity sensor; 18. Liquid inlet valve port; 19. Detection port; 110. Liquid discharge valve port; 111. Steam exhaust valve port; 112. Pressure gauge;

[0046] 21. Feeding port; 22. Exhaust valve port; 23. Vacuum tube;

[0047] 41. Steam inlet port; 42. Liquid outlet port; 43. Support pipe seat; 44. Integrated pulse tube refrigerator; 45. Three-way pipe; 46. Slow-release filter plate; 47. Diffusion hole; 48. Sinking port; 49. Guide plate; 410. Lower flow hole; 411. Liquid outlet;

[0048] 51. Positioning support foot; 52. Walking platform; 53. Guardrail frame; 54. Handrail; 55. First bottom support rod; 56. Second bottom support rod; 57. Folding pedal; 58. Telescopic cylinder; 59. Chain; 510. U-shaped frame. DETAILED DESCRIPTION

[0049] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0050] like Figure 1-13 As shown, a large-scale atmospheric pressure low-temperature liquid storage tank comprises an outer jacket cylinder 1, an inner storage tank 11 embedded in the outer jacket cylinder 1, an inner sealing cover 2 sealed between the inner storage tank 11 and the outer jacket cylinder 1, an outer sealing flange cover 3 sealed at the opening of the outer jacket cylinder 1, and a liquefaction tank 4 for liquefying evaporated gas;

[0051] Among them, the top of the outer surface of the outer jacket cylinder 1 is also provided with a liquid inlet valve port 18 and a detection port 19 which are connected with the interior of the inner storage tank 11. The liquid inlet valve port 18 can be used to add liquid, and the detection port 19 can be used to detect the interior of the device when a failure occurs. At the same time, secondary protective covers are arranged around the liquid inlet valve port 18 and the detection port 19 to avoid damage caused by bumps, improve explosion-proof capability, and avoid liquid leakage.

[0052] See attached Figure 3-6 A vacuum insulation chamber is provided between the inner storage tank 11 and the outer jacket cylinder 1, and a partition plate 12 is fixedly welded between the inner storage tank 11 and the outer jacket cylinder 1, and the vacuum insulation chamber is equally divided into isolation chambers 13 by the partition plate 12;

[0053] In this embodiment, the vacuum insulation chamber is equally divided into four isolation chambers 13. In other embodiments, it can be selected according to needs, and at least divided into two isolation chambers 13, so that the pearl sand in the vacuum chamber is separated from each other, thereby greatly reducing its sedimentation amplitude, and no top space will appear, thereby improving the insulation performance of the entire device, avoiding the "sweating" phenomenon on the top of the outer jacket cylinder 1, and ensuring the storage safety of the cryogenic liquid;

[0054] Furthermore, in order to monitor the state of the pearl sand in the isolation chamber 13, a monitoring port 14 is integrally formed on the outer jacket cylinder 1 corresponding to the isolation chamber 13, and a sealing cover plate 15 is sealed on the monitoring port 14. By fixing a pressure sensor 16 and a temperature and humidity sensor 17 on the sealing cover plate 15, and extending the detection probes of the pressure sensor 16 and the temperature and humidity sensor 17 through the monitoring port 14 to the interior of the isolation chamber 13, the pressure sensor 16 and the temperature and humidity sensor 17 can be used to monitor the state of the pearl sand inside the isolation chamber 13 in real time, so as to determine whether moisture or agglomeration occurs inside the isolation chamber 13.

[0055] Refer to the attached Figure 5-7 The inner sealing cover 2 is sealed and installed between the inner storage tank 11 and the outer jacket cylinder 1 to seal the isolation chamber 13. The inner sealing cover 2 is provided with a feeding port 21 and an exhaust valve port 22, and the exhaust valve port 22 extends to one end of the isolation chamber 13 and is provided with a vacuum pipe 23. At the same time, the vacuum pipe 23 extends inside the isolation chamber 13 to the other end. Pearl sand can be filled into the isolation chamber 13 through the feeding port 21, and the isolation chamber 13 can be exhausted to the vacuum standard through the exhaust valve port 22 and the vacuum pipe 23, and then The inner sealing cover 2 is used to seal the opening of the outer jacket cylinder 1 and the inner storage tank 11, so as to isolate the pearl sand inside each isolation chamber 13 from each other. Once the pearl sand is damp or agglomerated, the inner sealing cover 2 on the isolation chamber 13 with the problem can be removed, and then the agglomerated pearl sand inside can be cleaned, refilled with pearl sand, and then evacuated again to restore the vacuum to the specified standard. Compared with the traditional structure, there is no need to replace the entire pearl sand, the repair efficiency is higher, more convenient, and the waste of resources is reduced;

[0056] In contrast, by covering the outer sealing flange cover 3 on the inner sealing cover 2, the outer jacket cylinder 1 and the inner storage tank 11 can be sealed for a second time, thereby ensuring air tightness and improving the thermal insulation performance of the device.

[0057] In other embodiments, a sealing cover may be separately provided on the inner storage tank 11 and overlapped with the outer sealing flange cover 3 to form a three-layer sealing structure, thereby further improving the sealing effect and the heat insulation effect.

[0058] Refer to the attached Figure 8-10 In order to communicate with the liquefaction tank 4, the outer jacket cylinder 1 is provided with a drain valve port 110 and a steam exhaust valve port 111 at one end away from the opening;

[0059] Among them, the drain valve port 110 is arranged at the bottom of the outer jacket cylinder 1, and the exhaust valve port 111 is arranged at the top of the outer jacket cylinder 1, and the two are symmetrically arranged and communicated with the inside of the inner storage tank 11, and the outer jacket cylinder 1 is matched with the exhaust valve port 111 and the drain valve port 110. A pressure gauge 112 for monitoring the internal pressure of the inner storage tank 11 at this position is installed, which can facilitate the real-time observation of the internal pressure of the device when discharging cryogenic liquid;

[0060] Further, the liquefied tank 4 is arranged between the drain valve port 110 and the exhaust valve port 111, and the top of the liquefied tank 4 is integrally formed with a steam inlet port 41, and the bottom is integrally formed with a liquid outlet port 42, the steam inlet port 41 can be connected to the exhaust valve port 111 through a pipeline, and the liquid outlet port 42 is connected to a three-way pipe 45 through a pipeline, and the three-way pipe 45 is used to connect the liquid inlet at one end to the drain valve port 110, and the other drain hole is connected to the drain pipe for discharging the cryogenic liquid, so that the vapor after evaporation floats up and is discharged into the liquefied tank 4 through the exhaust valve port 111, and the cryogenic liquid is discharged from the drain valve port 110 by its own fluidity;

[0061] In order to liquefy the evaporated gas, a support pipe seat 43 is integrally formed on the side of the liquid outlet port 42. An integrated pulse tube refrigerator 44 is fixedly mounted on the support pipe seat 43, and the cold end heat exchanger of the integrated pulse tube refrigerator 44 is embedded in the liquefaction tank 4 through the support pipe seat 43, so that when the vaporized liquid flows through the cold end heat exchanger of the integrated pulse tube refrigerator 44, it will exchange heat with it and absorb heat energy, thereby liquefying it again;

[0062] In this embodiment, in order to further improve the liquefaction rate and the recovery rate of evaporated gas, a slow-release filter plate 46 and a guide plate 49 are fixedly installed inside the liquefaction tank 4. At the same time, the slow-release filter plate 46 and the guide plate 49 are arranged in an equidistant array inside the liquid outlet port 42, and are respectively located on the upper and lower sides of the cold-end heat exchanger of the integrated pulse tube refrigerator 44. The stacked relationship of the array can be used to allow the vaporized liquid to be gradually and repeatedly released slowly, thereby reducing its flow rate so that it can fully contact with the cold-end heat exchanger to achieve the purpose of full liquefaction. The slow-release filter plate 46 is made into a funnel cone, and the side wall is evenly provided with diffusion holes 47. At the same time, a sinking port 48 is integrally formed at the bottom of the slow-release filter plate 46 to ensure the fluidity of the gas. At the same time, the conical feature is used to allow the gas to be continuously concentrated to the cold-end heat exchanger of the integrated pulse tube refrigerator 44 to ensure that the gas can fully contact with it for liquefaction.

[0063] Furthermore, the guide plate 49 is in an inverted funnel shape, and a liquid outlet 411 is integrally formed on the top. A lower flow hole 410 is provided in a circular array on the outer periphery of the bottom of the guide plate 49, which can reduce the flow rate of the liquefied gas and disperse it to flow in the lower flow holes 410, thereby avoiding the gas in the gas-liquid mixed state being carried away by too fast a flow rate, thereby ensuring that sufficient gas is fully liquefied.

[0064] See attached Figure 1 as well as Figure 12-13 In order to stably place the outer jacket cylinder 1, a support frame 5 is also included. Positioning legs 51 are fixedly welded at both ends and four corners of the support frame 5. By embedding and installing the outer jacket cylinder 1 between the positioning legs 51, the outer jacket cylinder 1 can be stably supported so that it will not shake easily when storing low-temperature liquid, thereby improving the safety of liquid storage;

[0065] Furthermore, in order to facilitate the staff to inspect and repair the tank body, a walking platform 52 is fixedly installed on the top of the outer jacket cylinder 1 on the top surface of the support frame 5, and a guardrail frame 53 is also fixedly installed on it. A U-shaped frame 510 is arranged on one side of the opening of the guardrail frame 53. A handrail rod 54, a first bottom support rod 55, and a second bottom support rod 56 are connected by rotating in sequence between the U-shaped frame 510 and the guardrail frame 53, and a folding pedal 57 is rotated and installed between two parallel and opposite groups of the first bottom support rod 55 and the second bottom support rod 56. At the same time, a telescopic cylinder 58 for changing the folding state is arranged between the top of the U-shaped frame 510 and the first bottom support rod 55, so that the telescopic cylinder 58 can be adjusted. One end of the cylinder 58 is rotatably connected to the top of the U-shaped frame 510, and the other end is rotatably connected to the first bottom support rod 55. The telescopic cylinder 58 can be used to make the U-shaped frame 510 swing up and down relative to the guardrail frame 53, and then the handrail rod 54, the first bottom support rod 55, and the second bottom support rod 56 can be relatively swung, so that the folding pedal 57 can be switched between stacking and laying flat, so that the staff can climb the guardrail frame 53 through the ladder formed by the folding pedal 57, and can carefully observe the top of the outer jacket cylinder 1, find problems in time, and repair them in a targeted manner, thereby providing effective protection for the storage of cryogenic liquids;

[0066] Furthermore, in order to ensure the stability of state conversion, a chain 59 is fixedly bolted to the end of the first bottom support rod 55 away from the U-shaped frame 510 on the other side of the U-shaped frame 510 away from the telescopic cylinder 58, and the U-shaped frame 510 is provided with corresponding bolts and clamping rings. When adjusted to the required state, the chain 59 can be used to connect the U-shaped frame 510 and the first bottom support rod 55 to provide tensile support force therefor, thereby avoiding changes in the shape due to the downward pressure of the staff and ensuring the safety of the staff.

[0067] The working principle of the present invention is as follows: when in use, the opening of each isolation chamber 13 can be sealed in turn by the inner sealing cover 2, and pearl sand can be filled into the interior thereof by using the feeding port 21, and the isolation chamber 13 can be evacuated to the vacuum standard through the exhaust valve port 22 and the vacuum pipe 23, and then the inner sealing cover 2 can be used to seal the opening of the outer jacket cylinder 1 and the inner storage tank 11;

[0068] Secondly, during the liquid storage process, the sealing cover plate 15 and the pressure sensor 16 can be used to monitor the temperature, humidity and pressure state inside the isolation chamber 13 in real time. Once an abnormality occurs and continues to remain in the abnormal state, it means that there is a problem with the internal vacuum degree, and the pearl sand may have been damp or agglomerated. At this time, it is necessary to transfer the low-temperature liquid in the inner storage tank 11 for storage, and then remove the outer sealing flange cover 3, and remove the inner sealing cover 2 on the isolation chamber 13 with problems, and then clean the agglomerated pearl sand inside, refill the pearl sand, and evacuate again to restore the vacuum to the specified standard;

[0069] Finally, during the low-temperature liquid discharge process, the liquid discharge valve 110 and the steam exhaust valve 111 can be opened simultaneously to discharge the low-temperature liquid, so that the evaporated low-temperature liquid enters the liquefaction tank 4 through the steam exhaust valve 111 and the steam inlet port 41. At the same time, the integrated pulse tube refrigerator 44 is used for heat exchange to reduce the internal temperature of the support pipe seat 43, so that the vaporized liquid is liquefied again and flows back into the discharged low-temperature liquid through the liquid outlet port 42, and is discharged outside the tank body together, so that it can be recycled and reused, reducing the evaporation waste of the low-temperature liquid during discharge.

[0070] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A large-scale atmospheric pressure low-temperature liquid storage tank, characterized in that: include: An outer jacket cylinder (1) has an inner storage tank (11) embedded therein, a vacuum insulation chamber is arranged between the inner storage tank (11) and the outer jacket cylinder (1), a partition plate (12) is fixedly welded between the inner storage tank (11) and the outer jacket cylinder (1), the partition plate (12) divides the vacuum insulation chamber into isolation chambers (13) in equal parts, the outer jacket cylinder (1) is provided with a monitoring mechanism for monitoring the state inside the isolation chamber (13), and a liquid discharge valve port (110) and a steam discharge valve port (111) are respectively arranged at one end of the outer jacket cylinder (1) away from the opening; an inner sealing cover (2) which is sealingly installed between the inner storage tank (11) and the outer jacket cylinder (1) and is used to seal the isolation chamber (13); a feeding port (21) and an exhaust valve port (22) are provided on the inner sealing cover (2); a vacuum pipe (23) is installed at one end of the exhaust valve port (22) extending to the interior of the isolation chamber (13); and the vacuum pipe (23) extends inside the isolation chamber (13) to the other end thereof; An outer sealing flange cover (3) is sealingly mounted at the opening of the outer jacket cylinder (1) and covers the inner sealing cover (2) for secondary sealing of the outer jacket cylinder (1) and the inner storage tank (11); A liquefaction tank (4) is arranged between the liquid discharge valve port (110) and the steam discharge valve port (111); a steam inlet port (41) is integrally formed at the top of the liquefaction tank (4), and a liquid outlet port (42) is integrally formed at the bottom; a support pipe seat (43) is integrally formed on the side of the liquid outlet port (42); an integrated pulse tube refrigerator (44) is fixedly mounted on the support pipe seat (43); a cold end heat exchanger of the integrated pulse tube refrigerator (44) is embedded in the liquefaction tank (4) through the support pipe seat (43); and a slow-release mechanism for increasing the liquefaction rate is also provided in the liquefaction tank (4); The isolation chamber (13) is formed by dividing the isolation chamber (13) by the partition plate (12) and is sealed separately by the inner sealing cover (2). The internal state of the isolation chamber (13) can be monitored in real time by a monitoring mechanism to promptly detect the phenomenon of the pearl sand being damp or agglomerated, and then the pearl sand in each isolation chamber (13) can be replaced separately. At the same time, the liquefaction tank (4) and the integrated pulse tube refrigerator (44) can liquefy part of the vaporized liquid when discharging the low-temperature liquid.

2. A large-scale atmospheric pressure low-temperature liquid storage tank according to claim 1, characterized in that: The monitoring mechanism comprises a monitoring port (14) corresponding to the isolation chamber (13) and integrally formed on the outer jacket cylinder (1), a sealing cover plate (15) sealingly mounted on the monitoring port (14), and a pressure sensor (16) and a temperature and humidity sensor (17) fixedly mounted on the sealing cover plate (15); detection probes of the pressure sensor (16) and the temperature and humidity sensor (17) extend through the monitoring port (14) to the interior of the isolation chamber (13).

3. A large-scale atmospheric pressure low-temperature liquid storage tank according to claim 1, characterized in that: The top of the outer surface of the outer jacket cylinder (1) is also provided with a liquid inlet valve port (18) and a detection port (19) which are connected to the interior of the inner storage tank (11), and secondary protective covers are provided around the liquid inlet valve port (18) and the detection port (19).

4. A large-scale atmospheric pressure low-temperature liquid storage tank according to claim 1, characterized in that: The steam inlet port (41) is connected to the steam exhaust valve port (111) via a pipeline, and the liquid outlet port (42) is connected to a three-way pipe (45) via a pipeline. The liquid inlet at one end of the three-way pipe (45) is connected to the liquid exhaust valve port (110), and the other liquid exhaust hole is also connected to the liquid exhaust pipe for exhausting low-temperature liquid.

5. A large-scale atmospheric pressure low-temperature liquid storage tank according to claim 1, characterized in that: The drain valve port (110) is arranged at the bottom of the outer jacket cylinder (1), and the exhaust valve port (111) is arranged at the top of the outer jacket cylinder (1), and the two are symmetrically arranged and communicated with the interior of the inner storage tank (11). The outer jacket cylinder (1) is equipped with a pressure gauge (112) for monitoring the internal pressure of the inner storage tank (11) at that position, which matches the exhaust valve port (111) and the drain valve port (110).

6. A large-scale atmospheric pressure low-temperature liquid storage tank according to claim 1, characterized in that: The slow-release mechanism comprises a slow-release filter plate (46) and a guide plate (49) fixedly mounted inside the liquefaction tank (4); the slow-release filter plate (46) and the guide plate (49) are arranged in an equidistant array inside the liquid outlet port (42), and are respectively located on the upper side and the lower side of the cold end heat exchanger of the integrated pulse tube refrigerator (44).

7. A large-scale atmospheric pressure low-temperature liquid storage tank according to claim 6, characterized in that: The slow-release filter plate (46) is in the shape of a funnel cone, and has diffuser holes (47) evenly formed on its side wall. A sinking opening (48) is integrally formed at the bottom end of the slow-release filter plate (46).

8. A large-scale atmospheric pressure low-temperature liquid storage tank according to claim 6, characterized in that: The guide plate (49) is in the shape of an inverted funnel, and has a liquid outlet (411) integrally formed on the top. The guide plate (49) has lower flow holes (410) arranged in a circular array on the outer circumference of the bottom.

9. A large-scale atmospheric-pressure low-temperature liquid storage tank according to claim 1, characterized in that: It also includes a support frame (5) for supporting the outer jacket cylinder (1), wherein positioning legs (51) are fixedly welded at both ends and four corners of the support frame (5), and the outer jacket cylinder (1) is embedded and installed between the positioning legs (51). A walking platform (52) is fixedly installed on the top surface of the support frame (5) at the top of the outer jacket cylinder (1), and a guardrail frame (53) is also fixedly installed on the walking platform (52). A climbing mechanism for workers to go up and down is provided at the notch of the guardrail frame (53).

10. A large-scale atmospheric-pressure low-temperature liquid storage tank according to claim 9, characterized in that: The climbing mechanism comprises a U-shaped frame (510) arranged at one side of the opening of the guardrail frame (53), a handrail rod (54), a first bottom support rod (55), and a second bottom support rod (56) rotatably connected between the U-shaped frame (510) and the guardrail frame (53), a folding pedal (57) is rotatably installed between two parallel groups of the first bottom support rods (55) and the second bottom support rods (56), and a telescopic cylinder (58) for changing the folding state is arranged between the top end of the U-shaped frame (510) and the first bottom support rod (55).

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