CN114935242A - Liquid nitrogen preparation system and preparation method thereof - Google Patents
Liquid nitrogen preparation system and preparation method thereof Download PDFInfo
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- CN114935242A CN114935242A CN202210632803.3A CN202210632803A CN114935242A CN 114935242 A CN114935242 A CN 114935242A CN 202210632803 A CN202210632803 A CN 202210632803A CN 114935242 A CN114935242 A CN 114935242A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 241
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 117
- 239000007788 liquid Substances 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 47
- 238000009413 insulation Methods 0.000 claims abstract description 24
- 238000005057 refrigeration Methods 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 claims description 37
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 230000000737 periodic effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004172 nitrogen cycle Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0225—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using other external refrigeration means not provided before, e.g. heat driven absorption chillers
- F25J1/0227—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using other external refrigeration means not provided before, e.g. heat driven absorption chillers within a refrigeration cascade
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0012—Primary atmospheric gases, e.g. air
- F25J1/0015—Nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0225—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using other external refrigeration means not provided before, e.g. heat driven absorption chillers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
- F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
- F25J1/0276—Laboratory or other miniature devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/30—Compression of the feed stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
- F25J2270/908—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by regenerative chillers, i.e. oscillating or dynamic systems, e.g. Stirling refrigerator, thermoelectric ("Peltier") or magnetic refrigeration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
- F25J2270/912—Liquefaction cycle of a low-boiling (feed) gas in a cryocooler, i.e. in a closed-loop refrigerator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/62—Details of storing a fluid in a tank
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention belongs to the technical field of liquid nitrogen preparation, and particularly relates to a liquid nitrogen preparation system and a preparation method thereof. The liquid nitrogen preparation system comprises a self-cascade ultralow temperature unit, a heat insulation tank, a nitrogen circulation pressurization system and a central control system, wherein the central control system is electrically connected with the control ends of the self-cascade ultralow temperature unit, the heat insulation tank and the single-circulation pressurization system, a refrigeration coil pipe is arranged in the heat insulation tank, an inlet and an outlet of the refrigeration coil pipe are connected with a first connecting pipe and a second connecting pipe respectively, and the first connecting pipe and the second connecting pipe are connected with an inlet and an outlet of the self-cascade ultralow temperature unit respectively. According to the liquid nitrogen preparation system and the preparation method thereof, a high-value refrigeration unit such as GM or pulse is not needed, so that the cost is greatly reduced; and the nitrogen circulation pressurization system is matched with the heat insulation tank, the self-cascade ultralow temperature unit and the central control system, so that the recycling of nitrogen-liquid nitrogen-liquid nitrogen is realized.
Description
Technical Field
The invention belongs to the technical field of liquid nitrogen preparation, and particularly relates to a liquid nitrogen preparation system and a liquid nitrogen preparation method.
Background
The existing experimental instruments and monitoring instruments need to adopt liquid nitrogen refrigeration to obtain equipment below-180 ℃, most of the equipment are used in a self-cascade refrigeration mode, a temperature area below-180 is difficult to obtain, the application range is limited, the equipment adopting GM for preparing liquid nitrogen has high investment cost, and the equipment directly adopting liquid nitrogen refrigeration is inconvenient to obtain and purchase in certain occasions and has higher cost; in addition, the liquid nitrogen preparation machine on the current market basically adopts compressed air to prepare high-purity nitrogen firstly, then the nitrogen is liquefied into liquid nitrogen through ultralow temperature, the air is directly discharged after the liquid nitrogen is refrigerated, the nitrogen cannot be recycled, the utilization rate of the nitrogen is low, equipment accessories are required to be frequently replaced during nitrogen preparation, the operation cost is high, and the equipment is complex.
Disclosure of Invention
The invention aims to solve the problems and provides a liquid nitrogen preparation system and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme: a liquid nitrogen preparation system comprises a self-overlapping type ultralow temperature unit, a heat-insulating tank, a nitrogen circulating pressurization system and a central control system, wherein the central control system is electrically connected with control ends of the self-overlapping type ultralow temperature unit, the heat-insulating tank and the single-circulating pressurization system;
the nitrogen circulating supercharging system comprises a liquid nitrogen refrigerator, a first storage tank, a second storage tank, a nitrogen gas bottle, an insulating pipe, a first air inlet pipe, an air-vent valve, a second air inlet pipe, a third connecting pipe, a fourth connecting pipe and a fifth connecting pipe, wherein one end of the liquid nitrogen refrigerator is connected with an outlet of the insulating tank through the insulating pipe, the other end of the liquid nitrogen refrigerator is communicated with the second air inlet pipe through the third connecting pipe, the first air inlet pipe is connected with the nitrogen gas bottle, the air-vent valve is installed on the first air inlet pipe, two ends of the second air inlet pipe are communicated with the first air inlet pipe and are located between the air-vent valve and the insulating tank, the third connecting pipe is connected with the second air inlet pipe and the first storage tank, the fourth connecting pipe is connected with the second air inlet pipe and the second storage tank, and the second air inlet pipe is provided with a high-pressure booster pump and a low-pressure booster pump.
In the liquid nitrogen preparation system, the first connecting pipe, the first air inlet pipe, the second air inlet pipe, the third connecting pipe, the fourth connecting pipe, the fifth connecting pipe and the heat insulation pipe are all provided with electromagnetic valves, and each electromagnetic valve is electrically connected with the central control system.
In the above liquid nitrogen preparation system, hand valves are mounted on the first air inlet pipe, the second air inlet pipe, the third connecting pipe, the fourth connecting pipe, the fifth connecting pipe and the high-pressure booster pump.
In the above liquid nitrogen preparation system, pressure gauges are respectively installed on the heat insulation tank, the first storage tank, the second storage tank and the first air inlet pipe, safety valves are respectively installed on the heat insulation tank, the first storage tank and the second storage tank, a liquid level gauge is installed on the heat insulation tank, and the pressure gauges, the safety valves and the liquid level gauge are electrically connected with the central control system.
In the liquid nitrogen preparation system, the heat insulation tank and the liquid nitrogen refrigerator are provided with thermometers, and the thermometers are electrically connected with the central control system.
In the above liquid nitrogen preparation system, the first storage tank and the second storage tank are both provided with exhaust ports.
In the liquid nitrogen preparation system, the number of the electromagnetic valves in the second air inlet pipe is equal to that of the electromagnetic valves in the second air inlet pipe, the electromagnetic valves are separated from the fourth air inlet pipe through the third connecting pipe, and one side of each of the three electromagnetic valves is provided with a check valve.
In the above liquid nitrogen preparation system, a check valve is installed on the first air inlet pipe.
In the above-mentioned liquid nitrogen preparation system, the third connecting pipe is located between the high-pressure booster pump and the low-pressure booster pump, and the low-pressure booster pump is located between the fourth connecting pipe and the fifth connecting pipe.
A liquid nitrogen preparation method based on the liquid nitrogen preparation system comprises the following steps:
s1, starting a central control system, adding nitrogen into the heat-insulating tank by a nitrogen bottle, refrigerating the nitrogen by the self-cascade ultralow-temperature unit through heat exchange, and refrigerating the high-pressure nitrogen into liquid nitrogen at the refrigerating temperature of lower than-155 ℃;
s2, the liquid nitrogen in the step S1 enters a liquid nitrogen refrigerator through a heat insulation pipe, and the liquid nitrogen with the temperature of minus 180 ℃ to minus 196 ℃ is obtained through refrigeration;
s3, discharging the gasified liquid nitrogen in the step S2 into a second storage tank, pressurizing to 0.8 +/-0.2 MPa through a low-pressure booster pump, then discharging into a first storage tank, pressurizing to more than 4MPa through a high-pressure booster pump, storing the first storage tank into a heat insulation pipe, exchanging heat with the self-stacking type ultralow-temperature unit again, and achieving the periodic circulation of nitrogen.
Compared with the prior art, the liquid nitrogen preparation system and the preparation method thereof have the advantages that:
1. the invention does not need a nitrogen making machine, does not need to adopt a high-value refrigerating unit such as GM or pulse and the like, greatly reduces the cost, realizes the recycling of nitrogen-liquid nitrogen-liquid nitrogen through the matching of a nitrogen circulating pressurization system, a heat insulation tank, a self-overlapping ultralow temperature unit and a central control system, and improves the utilization rate of nitrogen;
2. in the operation process, the nitrogen purchased in the market is adopted to replace the compression control to prepare the nitrogen, so that the equipment cost is reduced, the nitrogen is convenient to obtain, and the nitrogen can be recycled and only needs to be supplemented from time to time, so that the cost is further reduced, and the economic benefit is improved;
3. the high-pressure booster pump and the low-pressure booster pump both adopt oilless booster pumps, and liquid nitrogen prepared by a nitrogen system due to oil pollution is avoided.
Drawings
FIG. 1 is a refrigeration diagram of a liquid nitrogen preparation system and a preparation method thereof according to the present invention;
fig. 2 is a schematic system structure diagram of a liquid nitrogen preparation system and a liquid nitrogen preparation method provided by the invention.
In the figure: 1. a self-overlapping ultralow temperature unit; 2. an insulated tank; 3. a liquid nitrogen refrigerator; 4. a first storage tank; 5. a second storage tank; 6. a nitrogen gas cylinder; 7. a first connecting pipe; 8. a second connecting pipe; 9. a heat-insulating pipe; 10. a first intake pipe; 11. a pressure regulating valve; 12. a second intake pipe; 13. a third connecting pipe; 14. a fourth connecting pipe; 15. a fifth connecting pipe; 16. a high-pressure booster pump; 17. a low-pressure booster pump; 18. an electromagnetic valve; 19. a hand valve; 20. a pressure gauge; 21. a safety valve; 22. a liquid level meter; 23. a temperature meter; 24. an exhaust port; 25. a check valve; 26. a central control system; 27. nitrogen cycle pressurization system.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
As shown in fig. 1-2, a liquid nitrogen preparation system includes a self-stacking type ultra-low temperature unit 1, an adiabatic tank 2, a nitrogen circulation pressurization system 27 and a central control system 26, wherein the central control system 26 is a central controller and is electrically connected with control terminals of the self-stacking type ultra-low temperature unit 1, the adiabatic tank 2 and the single circulation pressurization system, a refrigeration coil is arranged in the adiabatic tank 2, an inlet and an outlet of the refrigeration coil are respectively connected with a first connecting pipe 7 and a second connecting pipe 8, the first connecting pipe 7 and the second connecting pipe 8 are respectively connected with an inlet and an outlet of the self-stacking type ultra-low temperature unit 1, thermometers 23 are installed on the adiabatic tank 2 and a liquid nitrogen refrigerator 3, the thermometers 23 are electrically connected with the central control system 26, and the thermometers 23 are used for monitoring refrigeration temperature in nitrogen circulation;
the nitrogen circulating pressurization system 27 comprises a liquid nitrogen refrigerator 3, a first storage tank 4, a second storage tank 5, a nitrogen gas bottle 6, an insulated pipe 9, a first air inlet pipe 10, a pressure regulating valve 11, a second air inlet pipe 12, a third connecting pipe 13, a fourth connecting pipe 14 and a fifth connecting pipe 15, one end of the liquid nitrogen refrigerator 3 is connected with the outlet of the insulated tank 2 through the insulated pipe 9, the other end is communicated with the second air inlet pipe 12 through the third connecting pipe 13, the first air inlet pipe 10 is connected with the insulated tank 2 and the nitrogen gas bottle 6, the pressure regulating valve 11 is arranged on the first air inlet pipe 10, two ends of the second air inlet pipe 12 are communicated with the first air inlet pipe 10 and are positioned between the pressure regulating valve 11 and the insulated tank 2, the third connecting pipe 13 is connected with the second air inlet pipe 12 and the first storage tank 4, the fourth connecting pipe 14 is connected with the second air inlet pipe 12 and the second storage tank 5, the second air inlet pipe 12 is provided with a high-pressure booster pump 16 and a low-pressure booster pump 17, the third connecting pipe 13 is located between the high-pressure booster pump 16 and the low-pressure booster pump 17, the low-pressure booster pump 17 is located between the fourth connecting pipe 14 and the fifth connecting pipe 15, the high-pressure booster pump 16 and the low-pressure booster pump 17 are both oil-free booster pumps, and exhaust ports 24 are formed in the first storage tank 4 and the second storage tank 5.
The first connecting pipe 7, the first air inlet pipe 10, the second air inlet pipe 12, the third connecting pipe 13, the fourth connecting pipe 14, the fifth connecting pipe 15 and the heat insulation pipe 9 are all provided with electromagnetic valves 18, and each electromagnetic valve 18 is electrically connected with the central control system 26; adiabatic jar 2, first holding vessel 4, all install manometer 20 on second holding vessel 5 and the first intake pipe 10, adiabatic jar 2, first holding vessel 4, all install relief valve 21 on the second holding vessel 5, install level gauge 22 on the adiabatic jar 2, and manometer 20, relief valve 21 and level gauge 22 link to each other with central control system 26 electrical property, central control system 26 can pass through level gauge 22, manometer 20 obtains information and grasps equipment behavior, and realize the switching of pipeline through control solenoid valve 18.
The number of the electromagnetic valves 18 on the second air inlet pipe 12 is 3, the electromagnetic valves are separated by the third connecting pipe 13 and the fourth connecting pipe 14, one side of each of the three electromagnetic valves 18 is provided with a check valve 25, and the check valve 25 is installed on the first air inlet pipe 10 to avoid the backflow of nitrogen in the pipeline.
The use of the valves and the connection to the central control system 26 ensures as safe a use of the preparation system as possible.
The method for preparing liquid nitrogen by adopting the liquid nitrogen preparation system comprises the following steps:
s1, starting the central control system 26, adding nitrogen into the heat insulation tank 2 by the nitrogen bottle 6, refrigerating the nitrogen by the self-cascade ultralow temperature unit 1 through heat exchange, and refrigerating the high-pressure nitrogen into liquid nitrogen at the refrigerating temperature of lower than-155 ℃;
s2, the liquid nitrogen in the step S1 enters a liquid nitrogen refrigerator 3 through a heat insulation pipe 9, and liquid nitrogen with the temperature of minus 180 ℃ to minus 196 ℃ is obtained through refrigeration;
s3, discharging the gasified liquid nitrogen in the step S2 into the second storage tank 5, pressurizing to 0.8 +/-0.2 MPa through the low-pressure booster pump 17, then discharging into the first storage tank 4, pressurizing to more than 4MPa through the high-pressure booster pump 16, storing the first storage tank 4 into the heat insulation pipe 9, exchanging heat with the self-cascade ultralow-temperature unit 1 again, and achieving the periodic circulation of nitrogen.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (10)
1. A liquid nitrogen preparation system comprises a self-stacking type ultralow temperature unit (1), an insulating tank (2), a nitrogen circulating pressurization system (27) and a central control system (26), and is characterized in that the central control system (26) is electrically connected with control ends of the self-stacking type ultralow temperature unit (1), the insulating tank (2) and the single circulating pressurization system, a refrigeration coil is arranged in the insulating tank (2), an inlet and an outlet of the refrigeration coil are respectively connected with a first connecting pipe (7) and a second connecting pipe (8), and the first connecting pipe (7) and the second connecting pipe (8) are respectively connected with an inlet and an outlet of the self-stacking type ultralow temperature unit (1);
the nitrogen circulating pressurization system (27) comprises a liquid nitrogen refrigerator (3), a first storage tank (4), a second storage tank (5), a nitrogen gas bottle (6), a heat insulation pipe (9), a first air inlet pipe (10), a pressure regulating valve (11), a second air inlet pipe (12), a third connecting pipe (13), a fourth connecting pipe (14) and a fifth connecting pipe (15), one end of the liquid nitrogen refrigerator (3) is connected with an outlet of the heat insulation tank (2) through the heat insulation pipe (9), the other end of the liquid nitrogen refrigerator is communicated with the second air inlet pipe (12) through the third connecting pipe (13), the first air inlet pipe (10) is connected with the heat insulation tank (2) and the nitrogen gas bottle (6), the pressure regulating valve (11) is installed on the first air inlet pipe (10), two ends of the second air inlet pipe (12) are communicated with the first air inlet pipe (10) and are positioned between the pressure regulating valve (11) and the heat insulation tank (2), third connecting pipe (13) are connected second intake pipe (12) and first storage jar (4), second intake pipe (12) and second storage jar (5) are connected in fourth connecting pipe (14), second intake pipe (12) are connected and are installed high-pressure booster pump (16) and low pressure booster pump (17).
2. The liquid nitrogen preparation system according to claim 1, wherein the first connecting pipe (7), the first air inlet pipe (10), the second air inlet pipe (12), the third connecting pipe (13), the fourth connecting pipe (14), the fifth connecting pipe (15) and the heat insulation pipe (9) are respectively provided with an electromagnetic valve (18), and each electromagnetic valve (18) is electrically connected with the central control system (26).
3. The liquid nitrogen preparation system according to claim 1, wherein hand valves (19) are mounted on the first gas inlet pipe (10), the second gas inlet pipe (12), the third connecting pipe (13), the fourth connecting pipe (14), the fifth connecting pipe (15) and the high-pressure booster pump (16).
4. The liquid nitrogen preparation system according to claim 1, wherein the heat-insulating tank (2), the first storage tank (4), the second storage tank (5) and the first air inlet pipe (10) are all provided with a pressure gauge (20), the heat-insulating tank (2), the first storage tank (4) and the second storage tank (5) are all provided with a safety valve (21), the heat-insulating tank (2) is provided with a liquid level gauge (22), and the pressure gauge (20), the safety valve (21) and the liquid level gauge (22) are electrically connected with a central control system (26).
5. A liquid nitrogen preparation system according to claim 1, wherein said heat-insulating tank (2) and said liquid nitrogen refrigerator (3) are equipped with thermometers (23), and said thermometers (23) are electrically connected to a central control system (26).
6. A liquid nitrogen preparation system according to claim 1, wherein the first storage tank (4) and the second storage tank (5) are each provided with a gas outlet (24).
7. A liquid nitrogen preparation system according to claim 2, characterized in that the number of solenoid valves (18) in the second inlet pipe (12) is 3, and the solenoid valves are separated by a third connecting pipe (13) and a fourth connecting pipe (14), and one side of each of the three solenoid valves (18) is provided with a check valve (25).
8. A liquid nitrogen preparation system according to claim 1, wherein a check valve (25) is installed on the first intake pipe (10).
9. A liquid nitrogen production system as set forth in claim 1, wherein the third connection pipe (13) is located between the high-pressure booster pump (16) and the low-pressure booster pump (17), and the low-pressure booster pump (17) is located between the fourth connection pipe (14) and the fifth connection pipe (15).
10. A liquid nitrogen preparation method based on the liquid nitrogen preparation system according to claim 1, comprising the steps of:
s1, starting a central control system (26), adding nitrogen into the heat-insulating tank (2) by a nitrogen bottle (6), refrigerating the nitrogen by the self-cascade ultralow temperature unit (1) through heat exchange, and refrigerating the high-pressure nitrogen into liquid nitrogen at the refrigerating temperature of lower than-155 ℃;
s2, the liquid nitrogen in the step S1 enters a liquid nitrogen refrigerator (3) through a heat insulation pipe (9) and is refrigerated to obtain liquid nitrogen with the temperature of minus 180 ℃ to minus 196 ℃;
s3, discharging the gasified liquid nitrogen in the step S2 into a second storage tank (5), boosting the gasified liquid nitrogen to 0.8 +/-0.2 MPa through a low-pressure booster pump (17), then discharging the gasified liquid nitrogen into a first storage tank (4), boosting the gasified liquid nitrogen to more than 4MPa through a high-pressure booster pump (16), storing the gasified liquid nitrogen in a heat insulation pipe (9) in the first storage tank (4), and exchanging heat with the self-cascade ultralow-temperature unit (1) again to achieve the periodic circulation of nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210632803.3A CN114935242A (en) | 2022-06-07 | 2022-06-07 | Liquid nitrogen preparation system and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210632803.3A CN114935242A (en) | 2022-06-07 | 2022-06-07 | Liquid nitrogen preparation system and preparation method thereof |
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| CN114935242A true CN114935242A (en) | 2022-08-23 |
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| CN202210632803.3A Pending CN114935242A (en) | 2022-06-07 | 2022-06-07 | Liquid nitrogen preparation system and preparation method thereof |
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| CN (1) | CN114935242A (en) |
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