CN110285319B - Liquid nitrogen recovery system and liquid nitrogen recovery method - Google Patents
Liquid nitrogen recovery system and liquid nitrogen recovery method Download PDFInfo
- Publication number
- CN110285319B CN110285319B CN201910615395.9A CN201910615395A CN110285319B CN 110285319 B CN110285319 B CN 110285319B CN 201910615395 A CN201910615395 A CN 201910615395A CN 110285319 B CN110285319 B CN 110285319B
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- liquid nitrogen
- pipeline
- tank
- recovery system
- refrigerator
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 350
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 174
- 239000007788 liquid Substances 0.000 title claims abstract description 127
- 238000011084 recovery Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 238000007710 freezing Methods 0.000 claims description 12
- 230000008014 freezing Effects 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000004659 sterilization and disinfection Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 3
- 230000001954 sterilising effect Effects 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 abstract description 9
- 238000004321 preservation Methods 0.000 description 13
- 239000012472 biological sample Substances 0.000 description 10
- 238000005192 partition Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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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
- F17C5/04—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases requiring the use of refrigeration, e.g. filling with helium or hydrogen
-
- 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
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
-
- 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
- F17D1/005—Pipe-line systems for a two-phase gas-liquid flow
-
- 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
-
- 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
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
-
- 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
- F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
- F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
- F17C2225/0107—Single phase
- F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
-
- 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
-
- 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
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0302—Heat exchange with the fluid by heating
-
- 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
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
- F17C2227/0339—Heat exchange with the fluid by cooling using the same fluid
-
- 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
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
- F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
- F17C2227/0353—Heat exchange with the fluid by cooling using another fluid using cryocooler
-
- 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
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0367—Localisation of heat exchange
- F17C2227/0388—Localisation of heat exchange separate
- F17C2227/039—Localisation of heat exchange separate on the pipes
-
- 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
- F17C2227/04—Methods for emptying or filling
- F17C2227/041—Methods for emptying or filling vessel by vessel
- F17C2227/042—Methods for emptying or filling vessel by vessel with change-over from one vessel to another
-
- 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
-
- 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
- F17C2265/037—Treating the boil-off by recovery with pressurising
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
Abstract
The invention relates to a liquid nitrogen recovery system which comprises a liquid nitrogen tank, a heating device, a booster pump, a pressure tank and a refrigerator, wherein an output port of the liquid nitrogen tank is connected with an input port of the heating device through a first pipeline, an output port of the heating device is connected with a spiral coil through a second pipeline, the spiral coil is wound on the first pipeline, one end of the spiral coil is communicated with the second pipeline, the other end of the spiral coil is communicated with an input end of a third pipeline, an output end of the third pipeline is communicated with an input port of the pressure tank through the booster pump, an output port of the pressure tank is communicated with an input port of the refrigerator through a fourth pipeline, and an output port of the refrigerator is communicated with an input port of the liquid nitrogen tank through a fifth pipeline. The liquid nitrogen recovery system can recycle liquid nitrogen and has lower refrigeration cost.
Description
Technical Field
The invention relates to a recovery system, in particular to a liquid nitrogen recovery system, and in addition, the invention also relates to a liquid nitrogen recovery method of the liquid nitrogen recovery system.
Background
At present, the biological sample is stored mainly by low-temperature refrigeration through a liquid nitrogen tank, and when in storage, operators need to place the biological sample in a freezing tube, and then the freezing tube is directly placed in the liquid nitrogen tank so as to store the biological sample at a deep low temperature. Because the liquid nitrogen in the liquid nitrogen tank volatilizes fast, and volatilized gaseous nitrogen is directly discharged to the atmosphere, the liquid nitrogen storage device does not have a recovery function, and therefore the existing storage mode cannot realize the recycling of the liquid nitrogen, and further the refrigeration cost is improved.
Therefore, a person skilled in the art needs to design a liquid nitrogen recovery device aiming at the problems to solve the problems of volatilization and recovery of nitrogen in the low-temperature storage equipment, realize recycling of nitrogen and reduce production and use costs.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a liquid nitrogen recovery system with low refrigeration cost, which can recycle liquid nitrogen.
The invention discloses a liquid nitrogen recovery system, which comprises a liquid nitrogen tank, a heating device, a booster pump, a pressure tank and a refrigerator, wherein an output port of the liquid nitrogen tank is connected with an input port of the heating device through a first pipeline, an output port of the heating device is connected with a spiral coil through a second pipeline, the spiral coil is wound on the first pipeline, one end of the spiral coil is communicated with the second pipeline, the other end of the spiral coil is communicated with an input end of a third pipeline, an output end of the third pipeline is communicated with the input port of the pressure tank through the booster pump, an output port of the pressure tank is communicated with the input port of the refrigerator through a fourth pipeline, and an output port of the refrigerator is communicated with the input port of the liquid nitrogen tank through a fifth pipeline.
Further, in the liquid nitrogen recovery system, the heating device is an aluminum heating block.
Further, in the liquid nitrogen recovery system, the first pipeline, the second pipeline, the spiral coil and the third pipeline are integrally formed.
Further, in the liquid nitrogen recovery system, the refrigerator is a Stirling refrigerator.
Further, the liquid nitrogen recovery system also comprises a bracket, and the refrigerator is arranged on the bracket.
Further, the liquid nitrogen recovery system also comprises a valve assembly, wherein the valve assembly comprises a nitrogen inlet valve arranged at the input port of the liquid nitrogen tank, a valve temperature sensor and a safety valve connected with the nitrogen inlet valve.
By means of the scheme, the invention has at least the following advantages: the arrangement of the booster pump, the pressure tank, the refrigerator and the pipelines ensures that the nitrogen volatilized from the pressure tank can be sterilized at high temperature and pressurized and recycled into the pressure tank, and returns into the liquid nitrogen tank after being cooled by the refrigerator, thereby realizing the cyclic utilization of liquid nitrogen and reducing the consumption of liquid nitrogen and the refrigeration cost. During specific work, the freezing pipe is stored in the liquid nitrogen tank, liquid nitrogen is arranged at the bottom of the freezing pipe, gaseous nitrogen volatilizes into the first pipeline from the one-way valve at the top end of the liquid nitrogen tank, namely the output port of the liquid nitrogen tank, gaseous nitrogen in the first pipeline is pre-cooled through the spiral coil after being heated and disinfected by the heating device, the spiral coil surrounds the first pipeline, the temperature of nitrogen in the first pipeline is lower, so that the spiral coil obtains a certain pre-cooling after passing through the first pipeline, the gaseous nitrogen is pressurized through the booster pump after being pre-cooled, the pressurized nitrogen enters the pressure tank containing oxygen, liquid nitrogen is produced through Stirling refrigeration after entering the pressure tank, and the generated cryogenic liquid nitrogen returns to the liquid nitrogen tank.
In conclusion, the liquid nitrogen recovery system can recycle liquid nitrogen and has lower refrigeration cost.
A liquid nitrogen recovery method of the liquid nitrogen recovery system described above, comprising the steps of:
S11: the freezing tube is stored in the liquid nitrogen tank, liquid nitrogen is arranged at the bottom of the freezing tube, and gaseous nitrogen volatilizes into the first pipeline from the one-way valve at the top end of the liquid nitrogen tank;
S12: the gaseous nitrogen in the first pipeline is heated by a heating device, and the heating temperature is 100-200 ℃;
S13: pre-cooling the gaseous nitrogen after high-temperature sterilization through a spiral coil;
s14: after precooling gaseous nitrogen, pressurizing by a booster pump;
s15: the pressurized nitrogen enters a pressure tank containing oxygen;
s16: after nitrogen enters the pressure tank, liquid-phase nitrogen is produced through the refrigerator, and the generated cryogenic liquid nitrogen enters the liquid nitrogen tank.
Further, according to the liquid nitrogen recovery method, the heating temperature of the heating device is 200 ℃.
The liquid nitrogen is recovered by the liquid nitrogen recovery method, so that the utilization rate of the liquid nitrogen is improved, and the use cost is reduced.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a perspective view of a liquid nitrogen recovery system;
FIG. 2 is a top view of a liquid nitrogen recovery system;
FIG. 3 is a perspective view of a liquid nitrogen tank;
FIG. 4 is a schematic view of the structure of the tank body of the liquid nitrogen tank;
Fig. 5 is a top view of the placement frame.
Wherein, 1: a tank body; 2: an access port; 3: a heat preservation pipe; 4: a bellows; 5: a hollow flange; 6: a mounting plate; 7: a connecting pipe; 8: a screw rod; 9: a hand wheel; 10: a connecting rod; 11: a placing rack; 12: a slide block; 13: a guide groove; 14: a bearing; 15: a seal ring; 16: installing a pipe; 17: placing a plate; 18: a partition plate; 19: a connecting plate; 20: a compartment; 21: a supporting plate; 22: a top cover; 23: a liquid nitrogen tank; 24: a heating device; 25: a booster pump; 26: a pressure tank; 27: a refrigerator; 28: a first pipe; 29: a second pipe; 30: a spiral coil; 31: a third conduit; 32: a fourth conduit; 33: a fifth pipe; 34: a bracket; 35: a nitrogen inlet valve; 36: a safety valve.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Referring to fig. 1 to 5, a liquid nitrogen recovery system according to a preferred embodiment of the present invention includes a liquid nitrogen tank 23, a heating device 24, a booster pump 25, a pressure tank 26 and a refrigerator 27, an output port of the liquid nitrogen tank is connected to an input port of the heating device through a first pipe 28, an output port of the heating device is connected to a spiral coil 30 through a second pipe 29, the spiral coil is wound around the first pipe, one end of the spiral coil is connected to the second pipe, the other end of the spiral coil is connected to an input port of a third pipe 31, an output port of the third pipe is connected to an input port of the pressure tank through the booster pump, an output port of the pressure tank is connected to an input port of the refrigerator through a fourth pipe 32, and an output port of the refrigerator is connected to an input port of the refrigerator through a fifth pipe 33.
The arrangement of the booster pump, the pressure tank, the refrigerator and the pipelines ensures that the nitrogen volatilized from the pressure tank can be sterilized at high temperature and pressurized and recycled into the pressure tank, and returns into the liquid nitrogen tank after being cooled by the refrigerator, thereby realizing the cyclic utilization of liquid nitrogen and reducing the consumption of liquid nitrogen and the refrigeration cost. Wherein, but first pipeline, second pipeline, helical coil and third pipeline integrated into one piece, heating device directly set up in first pipeline and second pipeline junction to realize the indirect heating to the interior liquid nitrogen of pipeline, in addition, first pipeline also accessible is directly input to heating device's inside and is directly to the disinfection of nitrogen gas through heating device's mode realization to nitrogen gas heating. The spiral coil is coiled on the first pipeline, namely the first pipeline penetrates through an inner cavity formed by surrounding the spiral coil, so that the first pipeline with colder temperature can pre-cool the spiral coil to pre-cool nitrogen after disinfection in the spiral coil. The arrangement of the refrigerator ensures that nitrogen output from the pressure tank is converted into low-temperature liquid nitrogen after being refrigerated by the refrigerator, and when the refrigerator is concretely implemented, the refrigerator is a Stirling refrigerator, and the working principle of the liquid nitrogen recovery system is as follows:
The freezing pipe is stored in the liquid nitrogen tank, liquid nitrogen is arranged at the bottom of the freezing pipe, gaseous nitrogen volatilizes into the first pipeline from a one-way valve at the top end of the liquid nitrogen tank, namely an output port of the liquid nitrogen tank, gaseous nitrogen in the first pipeline is pre-cooled through the spiral coil after being heated and disinfected by the heating device, the spiral coil surrounds the first pipeline, the temperature of nitrogen in the first pipeline is lower, so that the spiral coil obtains a certain pre-cooling after passing through the first pipeline, the gaseous nitrogen is pressurized through the booster pump after being pre-cooled, the pressurized nitrogen enters the pressure tank containing oxygen, liquid nitrogen is produced through Stirling refrigeration after entering the pressure tank, and the generated cryogenic liquid nitrogen returns to the liquid nitrogen tank.
Preferably, the heating means is an aluminium heating block.
The design realizes the heating function of the heating device on nitrogen. Specifically, the first pipeline and the second pipeline are integrally formed, and penetrate through the heating holes in the aluminum heating blocks, the heating holes are formed by the involution of the two aluminum blocks, and the aluminum blocks are heated in a heating resistance wire heating mode, so that high-temperature disinfection of nitrogen is realized.
Preferably, the first pipeline, the second pipeline, the spiral coil and the third pipeline are integrally formed.
Preferably, the refrigerator is a Stirling refrigerator.
Preferably, a bracket 34 is also included, and the refrigerator is disposed on the bracket.
Preferably, the liquid nitrogen tank further comprises a valve assembly, wherein the valve assembly comprises a nitrogen inlet valve 35 arranged at the inlet of the liquid nitrogen tank, a valve temperature sensor and a safety valve 36 connected with the nitrogen inlet valve.
Once the pressure in the liquid nitrogen tank is overlarge, the safety valve starts to release pressure, so that the use safety of the liquid nitrogen tank is improved.
Preferably, the liquid nitrogen tank comprises a tank body 1, a storage opening 2 communicated with the inner cavity of the tank body is arranged on the side wall of the tank body, a heat preservation pipe 3 is arranged on the outer side surface of the tank body around the storage opening, the heat preservation pipe is of a tubular structure with two open ends, the inner side surface of the heat preservation pipe is corrugated, and one end of the heat preservation pipe is arranged on the tank body.
The arrangement of the heat preservation pipe reduces the external cold conduction of liquid nitrogen or the external heat conduction of liquid nitrogen when an operator accesses the biological sample through the access port. Because the heat preservation pipe has a certain length and the inner side surface of the heat preservation pipe is corrugated, the cold guide distance of liquid nitrogen is prolonged, the external cold guide effect of the liquid nitrogen is further weakened, and the consumption of the liquid nitrogen is reduced.
Preferably, the tank body and the heat preservation pipe are hollow structures, and the inner side wall of the heat preservation pipe is a corrugated pipe 4.
The heat preservation effect of the heat preservation pipe is further enhanced by the heat preservation pipe with the hollow structure, and the heat conduction from the outside to liquid nitrogen is reduced.
The edge of the access port is also provided with a hollow flange 5 protruding out of the surface of the tank body, and one end of the hollow flange is fixedly connected with the tank body.
The hollow flange further reduces the consumption of liquid nitrogen.
Preferably, the tank body is internally provided with a mounting plate 6, a screw rod 8, a hand wheel 9, a connecting rod 10 and a placing rack 11, wherein the bottom end of the screw rod penetrates through the mounting plate and is in threaded connection with the connecting pipe 7, the connecting rod 10 is arranged between the connecting pipe and the tank body, the placing rack is rotatably arranged on the connecting pipe and is used for placing biological samples, the outer side surface of the mounting plate is connected with the inner side surface of the tank body, the hand wheel is positioned above the mounting plate, the connecting pipe is positioned below the mounting plate, one end of the connecting rod is connected with the connecting pipe, the other end of the connecting rod is connected with a sliding block 12, and the sliding block is arranged on a guide groove 13 or a guide rail on the inner side wall of the tank body.
This design makes the biological sample of access through access mouth that operating personnel can be convenient. Because the size of the access port is relatively small, in order to facilitate operators to access biological samples through the access port, components such as a hand wheel, a screw rod, a connecting pipe, a placing frame and the like are arranged. Specifically, when operating personnel need access sample, at first rotate the hand wheel for the lead screw that is connected with the hand wheel rotates, along with the rotation of lead screw, with lead screw threaded connection's connecting pipe along the lead screw removal, until the biological sample on the rack remove to the same height with the access mouth, then operating personnel makes the relative connecting pipe of rack rotate through manual mode, make the biological sample rotate to the position just right with the access mouth, then operating personnel alright take out the sample or put the sample on the rack through the access mouth, at last operating personnel close the lid on the access mouth can, it is very convenient to use. The connecting rod, the sliding block, the guide groove or the guide rail are arranged, so that the connecting pipe cannot rotate along with the hand wheel when an operator rotates the hand wheel.
Preferably, a bearing 14 is arranged between the screw rod and the mounting plate, and a sealing ring 15 is arranged above the bearing.
Preferably, the rack comprises a mounting tube 16 sleeved outside the connecting tube and a multi-layer placing plate 17 arranged on the side wall of the mounting tube.
Preferably, a plurality of partition boards 18 are arranged on the placing board centering on the mounting pipe, a plurality of connecting boards 19 for connecting adjacent partition boards are arranged on the outer edge of the placing board, and the partition boards between the adjacent partition boards surround to form a compartment 20 for placing biological samples.
The setting of placing board, baffle, connecting plate has realized the function of rack for a plurality of samples can separately keep in the jar internal.
Preferably, the bottom end of the connecting pipe is provided with a supporting plate 21, the bottom end of the mounting pipe is positioned above the supporting plate, and a top cover 22 is arranged above the mounting plate.
The setting of layer board has realized the supporting role to the rack, and the sealing performance of the jar body has further been strengthened in the setting of top cap.
A liquid nitrogen recovery method of the liquid nitrogen recovery system described above, comprising the steps of:
S11: the freezing tube is stored in the liquid nitrogen tank, liquid nitrogen is arranged at the bottom of the freezing tube, and gaseous nitrogen volatilizes into the first pipeline from the one-way valve at the top end of the liquid nitrogen tank;
S12: the gaseous nitrogen in the first pipeline is heated by a heating device, and the heating temperature is 100-200 ℃;
S13: pre-cooling the gaseous nitrogen after high-temperature sterilization through a spiral coil;
s14: after precooling gaseous nitrogen, pressurizing by a booster pump;
s15: the pressurized nitrogen enters a pressure tank containing oxygen;
s16: after nitrogen enters the pressure tank, liquid-phase nitrogen is produced through the refrigerator, and the generated cryogenic liquid nitrogen enters the liquid nitrogen tank.
Further, according to the liquid nitrogen recovery method, the heating temperature of the heating device is 200 ℃.
The liquid nitrogen is recovered by the liquid nitrogen recovery method, so that the utilization rate of the liquid nitrogen is improved, and the use cost is reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description.
Furthermore, the foregoing description of the preferred embodiments of the present invention is not intended to be limiting, and it should be noted that modifications and variations could be made by persons skilled in the art without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention. Meanwhile, it should be understood that although the present disclosure describes embodiments, not every embodiment contains only one independent technical solution, and the description is merely for clarity, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the examples may be combined appropriately to form other embodiments that can be understood by those skilled in the art.
Claims (7)
1. A liquid nitrogen recovery method of a liquid nitrogen recovery system is characterized in that: the liquid nitrogen recovery system comprises a liquid nitrogen tank (23), a heating device (24), a booster pump (25), a pressure tank (26) and a refrigerator (27), wherein an output port of the liquid nitrogen tank is connected with an input port of the heating device through a first pipeline (28), an output port of the heating device is connected with a spiral coil pipe (30) through a second pipeline (29), the spiral coil pipe is wound on the first pipeline, one end of the spiral coil pipe is communicated with the second pipeline, the other end of the spiral coil pipe is communicated with an input end of a third pipeline (31), an output end of the third pipeline is communicated with an input port of the pressure tank through the booster pump, an output port of the pressure tank is communicated with an input port of the refrigerator through a fourth pipeline (32), and an output port of the refrigerator is communicated with an input port of the liquid nitrogen tank through a fifth pipeline (33);
the liquid nitrogen recovery method of the liquid nitrogen recovery system comprises the following steps:
S11: the freezing tube is stored in the liquid nitrogen tank, liquid nitrogen is arranged at the bottom of the freezing tube, and gaseous nitrogen volatilizes into the first pipeline from the one-way valve at the top end of the liquid nitrogen tank;
s12: heating gaseous nitrogen in the first pipeline by a heating device, wherein the heating temperature is 100-200 ℃;
S13: pre-cooling the gaseous nitrogen after high-temperature sterilization through a spiral coil;
s14: after precooling gaseous nitrogen, pressurizing by a booster pump;
s15: the pressurized nitrogen enters a pressure tank containing oxygen;
s16: after nitrogen enters the pressure tank, liquid-phase nitrogen is produced through the refrigerator, and the generated cryogenic liquid nitrogen enters the liquid nitrogen tank.
2. The liquid nitrogen recovery method of the liquid nitrogen recovery system according to claim 1, wherein: the heating device is an aluminum heating block.
3. The liquid nitrogen recovery method of the liquid nitrogen recovery system according to claim 1, wherein: the first pipeline, the second pipeline, the spiral coil pipe and the third pipeline are integrally formed.
4. The liquid nitrogen recovery method of the liquid nitrogen recovery system according to claim 1, wherein: the refrigerator is a Stirling refrigerator.
5. The liquid nitrogen recovery method of the liquid nitrogen recovery system according to claim 1, wherein: the liquid nitrogen recovery system also includes a bracket (34) on which the refrigerator is disposed.
6. The liquid nitrogen recovery method of the liquid nitrogen recovery system according to claim 1, wherein: the liquid nitrogen recovery system further comprises a valve assembly, wherein the valve assembly comprises a nitrogen inlet valve (35) arranged at the input port of the liquid nitrogen tank, a valve temperature sensor and a safety valve (36) connected with the nitrogen inlet valve.
7. The liquid nitrogen recovery method of the liquid nitrogen recovery system according to claim 1, wherein: the heating temperature of the heating device was 200 ℃.
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| CN114935242A (en) * | 2022-06-07 | 2022-08-23 | 苏州蒂珀克制冷科技有限公司 | Liquid nitrogen preparation system and preparation method thereof |
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