CN112432053A - Zero discharge system device of liquid nitrogen storage tank - Google Patents
Zero discharge system device of liquid nitrogen storage tank Download PDFInfo
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- CN112432053A CN112432053A CN202011304092.4A CN202011304092A CN112432053A CN 112432053 A CN112432053 A CN 112432053A CN 202011304092 A CN202011304092 A CN 202011304092A CN 112432053 A CN112432053 A CN 112432053A
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- liquid
- pipe
- branch pipe
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- storage tank
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/014—Nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/01—Propulsion of the fluid
- F17C2227/0128—Propulsion of the fluid with pumps or compressors
- F17C2227/0135—Pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/033—Treating the boil-off by recovery with cooling
- F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a zero-emission system device of a liquid nitrogen storage tank, which comprises a first cryogenic pump, a second cryogenic pump, a vaporizer, a storage tank, a liquid branch pipe, a heat-preservation pipe box, a Dewar tank and a floor scale, wherein the liquid branch pipe is arranged inside the heat-preservation pipe box, and a heat-preservation cotton sleeve matched with the liquid branch pipe is filled inside the heat-preservation pipe box. This liquid nitrogen storage tank zero release system device fills the return air branch pipe dress when filling through the filling piping system of autonomic design in liquid branch pipe, lets the temperature of liquid branch pipe let the gaseous abundant cold volume transmission of its return air branch pipe cool down the liquefaction rapidly again through cryopump increase pressure and push back to in the liquid nitrogen tank gaseous phase outlet, reaches the effect of its zero release.
Description
Technical Field
The invention relates to the technical field of split charging production of liquid nitrogen storage tanks, in particular to a zero-emission system device of a liquid nitrogen storage tank.
Background
A method for filling a liquid nitrogen Dewar tank of a common gas filling station in the market is to directly weigh and fill a Dewar tank bottle group by means of pressure difference between a liquid nitrogen storage tank and the Dewar tank through connection of a metal corrugated pipe. This method has the following disadvantages in the actual filling operation:
1. the liquid nitrogen output from the liquid phase outlet of the liquid nitrogen tank is subjected to heat exchange with air through metal corrugations, so that a large amount of liquid nitrogen is gasified, the pressure in the dewar tank is continuously increased due to the nitrogen after being scratched, and when the pressure is increased to be balanced with the liquid nitrogen tank, the filling operation is difficult to continue;
2. after the pressure of the Dewar flask is balanced with the pressure of the tank, if the filling is continued, the emptying valve on the Dewar flask is opened to realize the filling, and the filling process is directly discharged, so that great waste is caused;
3. the filling efficiency is too low by means of filling by means of pressure difference, the filling speed and time are both determined by the pressure difference, and the efficiency is very poor;
4. the gasification tail gas caused by filling can not be recycled.
The closest technology of the prior patent application of the invention is to achieve the effect of recovering tail gas by a set of tail gas recovery device. The method is that the gasified nitrogen in the Dewar tank and the nitrogen exhausted from the liquid nitrogen tank are collected together and enter a gasifier to be gasified, and after being purified by a purifier, the mixture is pressurized by a molding press and is conveyed to a nitrogen gas bottle in a workshop for use. This method has the following disadvantages in practical operation:
1. the gas-phase nitrogen of the dewar tank and the liquid nitrogen tank must be recovered through a gas cylinder;
2. the filling of the dewar tank and the filling of the gas cylinder are carried out simultaneously;
3. the low efficiency and the low speed of the cylinder filling of the die press greatly increase the operation cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a zero discharge system device of a liquid nitrogen storage tank, which aims to solve the problems.
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a liquid nitrogen storage tank zero release system device, includes first cryopump, second cryopump, vaporizer, storage tank, liquid branch pipe, insulating tube box, dewar jar and weighbridge, the liquid branch pipe sets up in the inside of insulating tube box, the inside packing of insulating tube box has the cotton cover of heat preservation that cooperatees and use with the liquid branch pipe, one side fixed mounting of liquid branch pipe inner chamber has the return air branch pipe, the dewar jar is placed in the top of weighbridge, vent and inlet have been seted up respectively to the top of dewar jar to the top intercommunication of inlet has the feed liquor hose, the one end intercommunication of feed liquor hose has the feed liquor bleeder, the one end of feed liquor bleeder runs through the insulating tube box and communicates with the liquid branch pipe, the fixed surface of feed liquor bleeder has the pneumatic stop valve of feed liquor, the top intercommunication of vent has the return air hose, the one end intercommunication of return air hose has the return air bleeder, one end of the air return branch pipe sequentially penetrates through the heat preservation pipe box and the liquid branch pipe and is communicated with the air return branch pipe, and an air return pneumatic stop valve is fixedly mounted on the surface of the liquid inlet branch pipe.
Preferably, the left side of storage tank bottom has been seted up down the liquid phase export, the liquid phase export has been seted up at the middle part of storage tank bottom, the gaseous phase export has been seted up on the right side of storage tank bottom, the one end intercommunication of return-air branch pipe has the muffler, the one end of muffler runs through liquid branch pipe and insulating tube box in proper order and extends to the outside of insulating tube box, the muffler extends to the outside one end and the gaseous phase export intercommunication of insulating tube box.
Preferably, one side of the second cryopump is communicated with a liquid outlet pipe, one end of the liquid outlet pipe penetrates through the heat preservation pipe box and extends to the inside of the heat preservation pipe box, and one end of the liquid outlet pipe extending to the inside of the heat preservation pipe box is communicated with the liquid branch pipe.
Preferably, the bottom of the lower liquid phase outlet is communicated with a liquid distribution pipe, one end of the liquid distribution pipe and one side of the surface of the lower liquid phase outlet are communicated with a liquid distribution pipe, one ends of the two liquid distribution pipes are respectively communicated with the first cryogenic pump and the second cryogenic pump, a lower filling valve is fixedly mounted on the surface of the liquid distribution pipe, and a stop valve is fixedly mounted on the surface of the liquid distribution pipe.
Preferably, one side of the first cryogenic pump is communicated with a liquid guide pipe, one end of the liquid guide pipe and the lower part of the surface of the liquid guide pipe are respectively communicated with a first liquid inlet pipe and a second liquid inlet pipe, the first liquid inlet pipe is communicated with the second cryogenic pump, and one end of the second liquid inlet pipe is communicated with the upper liquid phase outlet.
Preferably, the drainage tube and the first liquid inlet pipe are both fixedly provided with an exhaust valve and an air return valve, and the surface of the second liquid inlet pipe is fixedly provided with an upper filling valve.
Preferably, the vaporizer is connected to the first cryopump through a connection pipe.
Preferably, a safety valve is fixedly installed on one side of the bottom of the surface of the liquid branch pipe through a connecting pipe.
Advantageous effects
The invention provides a zero-emission system device of a liquid nitrogen storage tank. Compared with the prior art, the method has the following beneficial effects:
(1) this liquid nitrogen storage tank zero release system device fills the return air branch pipe dress when filling the dress in liquid branch pipe the inside through the filling piping system of independently designing, lets the temperature of liquid branch pipe let the gaseous abundant cold volume transmission of its return air branch pipe cool down the liquefaction rapidly through the cryopump increase pressure again and push back to in the liquid nitrogen tank gaseous phase outlet, reach the effect of its zero release.
(2) This liquid nitrogen storage tank zero discharge system device fills the dress through adopting two cryogenic pumps to pressurize, can prevent that liquid nitrogen pressure from reducing, still for filling the dress and providing pressure and promote, gasifies easily in the liquid transmission process in solving current device, and the inside and outside atmospheric pressure of dewar bottle equals can't carry out the pressure differential and directly dash, and dewar bottle gas cylinder fills dress operation problem simultaneously.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the insulated pipe cassette construction of the present invention;
FIG. 3 is an enlarged view taken at A in FIG. 1 according to the present invention;
FIG. 4 is a schematic view of the method of FIG. 1 according to the present invention at B;
in the figure: 1. a first cryopump; 2. a second cryopump; 3. a vaporizer; 4. a storage tank; 5. a liquid branch pipe; 6. a heat-insulating pipe box; 7. a dewar tank; 8. a ground scale; 9. a heat insulation cotton sleeve; 10. a return air branch pipe; 11. A vent port; 12. a liquid inlet; 13. a liquid inlet hose; 14. a liquid inlet branch pipe; 15. a liquid inlet pneumatic stop valve; 16. a return air hose; 17. a branch return air pipe; 18. a return air pneumatic stop valve; 19. a lower liquid phase outlet; 20. an upper liquid phase outlet; 21. a gas phase outlet; 22. an air return pipe; 23. a liquid outlet pipe; 24. liquid outlet branch pipes; 25. a lower charging valve; 26. a stop valve; 27. a catheter; 28. a first liquid inlet pipe; 29. a second liquid inlet pipe; 30. an exhaust valve; 31. an air return valve; 32. an upper filling valve; 33. a safety valve; 34. a liquid separating pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a liquid nitrogen storage tank zero-emission system device comprises a first cryogenic pump 1, a second cryogenic pump 2, a vaporizer 3, a storage tank 4, a liquid branch pipe 5, a heat preservation pipe box 6, a Dewar tank 7 and a ground scale 8, wherein the first cryogenic pump 1 and the second cryogenic pump are low-temperature liquid pumps (with the flow rate of 1600L/h and the outlet pressure of 0.6-3.0MPA) for low-temperature production of three West, the liquid branch pipe 5 is arranged in the heat preservation pipe box 6, a heat preservation cotton sleeve 9 matched with the liquid branch pipe 5 is filled in the heat preservation pipe box 6, a return branch pipe 10 is fixedly arranged on one side of the inner cavity of the liquid branch pipe 5, the Dewar tank 7 is arranged on the top of the ground scale 8, a vent 11 and a liquid inlet 12 are respectively arranged on the top of the Dewar, the surface of the liquid inlet branch pipe 14 is fixedly provided with a liquid inlet pneumatic stop valve 15, the top of the vent 11 is communicated with an air return hose 16, one end of the air return hose 16 is communicated with an air return branch pipe 17, one end of the air return branch pipe 17 sequentially penetrates through the heat preservation pipe box 6 and the liquid branch pipe 5 and is communicated with the air return branch pipe 10, the surface of the liquid inlet branch pipe 14 is fixedly provided with an air return pneumatic stop valve 18, and the liquid inlet hose 13 and the air return hose 16 are vacuum metal corrugated pipes.
In the invention, the left side of the bottom of the storage tank 4 is provided with a lower liquid phase outlet 19, the middle part of the bottom of the storage tank 4 is provided with an upper liquid phase outlet 20, the right side of the bottom of the storage tank 4 is provided with a gas phase outlet 21, one end of the gas return branch pipe 10 is communicated with a gas return pipe 22, one end of the gas return pipe 22 sequentially penetrates through the liquid branch pipe 5 and the heat preservation pipe box 6 and extends to the outside of the heat preservation pipe box 6, and one end of the gas return pipe 22 extending to the outside of the heat preservation pipe box 6.
In the invention, one side of the second cryopump 2 is communicated with a liquid outlet pipe 23, one end of the liquid outlet pipe 23 penetrates through the heat preservation pipe box 6 and extends into the heat preservation pipe box 6, and one end of the liquid outlet pipe 23 extending into the heat preservation pipe box 6 is communicated with the liquid branch pipe 5.
In the invention, the bottom of the lower liquid phase outlet 19 is communicated with a liquid dividing pipe 23, one end of the liquid dividing pipe 23 and one side of the surface are communicated with liquid dividing pipes 24, one ends of the two liquid dividing pipes 24 are respectively communicated with the first cryogenic pump 1 and the second cryogenic pump 2, the surface of the liquid dividing pipe 23 is fixedly provided with a lower filling valve 25, and the surface of the liquid dividing pipe 24 is fixedly provided with a stop valve 26.
In the invention, one side of the first cryogenic pump 1 is communicated with a liquid guide pipe 27, one end of the liquid guide pipe 27 and the lower part of the surface are respectively communicated with a first liquid inlet pipe 28 and a second liquid inlet pipe 29, the first liquid inlet pipe 28 is communicated with the second cryogenic pump 2, and one end of the second liquid inlet pipe 29 is communicated with the upper liquid phase outlet 20.
In the invention, the drainage tube 27 and the first liquid inlet tube 28 are both fixedly provided with an exhaust valve 30 and an air return valve 31, and the surface of the second liquid inlet tube 29 is fixedly provided with an upper filling valve 32.
In the present invention, the vaporizer 3 and the first cryopump 1 are connected to each other through a connection pipe.
In the present invention, a safety valve 33 is fixedly installed on one side of the bottom of the surface of the liquid branch pipe 5 through a connection pipe.
And those not described in detail in this specification are well within the skill of those in the art.
During operation, liquid nitrogen is discharged from a lower liquid phase outlet 19 of the storage tank 4 and enters the first cryogenic pump 1 and the second cryogenic pump 2, the pressure of the pressurizing liquid nitrogen is controlled to be 1.0-2.0Mpa, the pressurizing liquid nitrogen is distributed to the liquid branch pipe 5 through the liquid outlet pipe 23 and is injected into the Dewar tank 7 through the liquid inlet hose 13, the Dewar tank 7 is filled and is finished after being weighed and qualified through the ground scale 8 and the liquid inlet pneumatic stop valve 15, gasified nitrogen in the Dewar tank 7 is discharged from the emptying port 11 of the Dewar tank 7, the nitrogen discharged through the air return hose 16 and the air return branch pipe 10 is collected to the air return pipe 22 and then returns to the gas phase outlet 21 of the storage tank 4, the nitrogen discharged from the air return hose 16 enters the air return branch pipe 10 through the air return branch pipe 17 and is completely liquefied by the liquid nitrogen in the liquid branch pipe 5 and returns to the gas phase outlet.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a liquid nitrogen storage tank zero release system device, includes first cryogenic pump (1), second cryogenic pump (2), vaporizer (3), storage tank (4), liquid branch pipe (5), insulating tube box (6), dewar jar (7) and weighbridge (8), its characterized in that: the utility model discloses a heat preservation pipe box, including heat preservation pipe box (6), liquid branch pipe (5), the inside packing of heat preservation pipe box (6) has the cotton cover of heat preservation (9) that cooperatees and use with liquid branch pipe (5), one side fixed mounting of liquid branch pipe (5) inner chamber has return air branch pipe (10), dewar jar (7) are placed in the top of weighbridge (8), drain (11) and inlet (12) have been seted up respectively to the top of dewar jar (7) to the top intercommunication of inlet (12) has inlet liquor hose (13), the one end intercommunication of inlet liquor hose (13) has inlet liquor bleeder (14), the one end of inlet liquor bleeder (14) runs through heat preservation pipe box (6) and communicates with liquid branch pipe (5), the fixed surface of inlet liquor bleeder (14) installs pneumatic stop valve of inlet liquor (15), the top intercommunication of drain (11) has return air hose (16), one end intercommunication of return-air hose (16) has return-air bleeder (17), the one end of return-air bleeder (17) run through insulating tube box (6) and liquid branch pipe (5) in proper order and communicate with return-air branch pipe (10), the fixed surface of feed liquor bleeder (14) installs return-air pneumatic stop valve (18).
2. The device of claim 1, wherein the device comprises: liquid phase export (19) down have been seted up in the left side of storage tank (4) bottom, liquid phase export (20) have been seted up at the middle part of storage tank (4) bottom, gas phase export (21) have been seted up on the right side of storage tank (4) bottom, the one end intercommunication of return air branch pipe (10) has muffler (22), the one end of muffler (22) runs through liquid branch pipe (5) and insulating tube box (6) in proper order and extends to the outside of insulating tube box (6), muffler (22) extend to the outside one end and gas phase export (21) intercommunication of insulating tube box (6).
3. The device of claim 1, wherein the device comprises: one side intercommunication of second cryopump (2) has drain pipe (23), the inside that heat preservation pipe box (6) and extend to heat preservation pipe box (6) is run through to the one end of drain pipe (23), drain pipe (23) extend to the inside one end of heat preservation pipe box (6) and liquid branch pipe (5) are linked together.
4. The device of claim 2, wherein the device comprises: the bottom intercommunication of lower liquid phase export (19) has liquid distribution pipe (23), one end and the one side on surface of liquid distribution pipe (23) all communicate liquid distribution pipe (24), two the one end of liquid distribution pipe (24) communicates respectively in first cryogenic pump (1) and second cryogenic pump (2), the fixed surface of liquid distribution pipe (23) installs down fills dress valve (25), the fixed surface that goes out liquid distribution pipe (24) installs stop valve (26).
5. The device of claim 1, wherein the device comprises: one side of the first cryogenic pump (1) is communicated with a liquid guide pipe (27), one end of the liquid guide pipe (27) and the lower part of the surface are respectively communicated with a first liquid inlet pipe (28) and a second liquid inlet pipe (29), the first liquid inlet pipe (28) is communicated with the second cryogenic pump (2), and one end of the second liquid inlet pipe (29) is communicated with the upper liquid phase outlet (20).
6. The device of claim 5, wherein the device comprises: an exhaust valve (30) and an air return valve (31) are fixedly arranged on the liquid guide pipe (27) and the first liquid inlet pipe (28), and an upper filling valve (32) is fixedly arranged on the surface of the second liquid inlet pipe (29).
7. The device of claim 1, wherein the device comprises: the vaporizer (3) is connected with the first cryogenic pump (1) through a connecting pipe.
8. The device of claim 1, wherein the device comprises: and a safety valve (33) is fixedly arranged on one side of the bottom of the surface of the liquid branch pipe (5) through a connecting pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011304092.4A CN112432053A (en) | 2020-11-19 | 2020-11-19 | Zero discharge system device of liquid nitrogen storage tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011304092.4A CN112432053A (en) | 2020-11-19 | 2020-11-19 | Zero discharge system device of liquid nitrogen storage tank |
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| CN202011304092.4A Pending CN112432053A (en) | 2020-11-19 | 2020-11-19 | Zero discharge system device of liquid nitrogen storage tank |
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Application publication date: 20210302 |