CN209822289U - A cryostat subcooling system for low temperature user performance test - Google Patents
A cryostat subcooling system for low temperature user performance test Download PDFInfo
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- CN209822289U CN209822289U CN201821993359.3U CN201821993359U CN209822289U CN 209822289 U CN209822289 U CN 209822289U CN 201821993359 U CN201821993359 U CN 201821993359U CN 209822289 U CN209822289 U CN 209822289U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model belongs to the fusion reactor technique, concretely relates to cryostat supercooling system for low temperature user capability test, including cryostat, establish helium circulating pump and heat exchanger through the pipe connection in cryostat, heat exchanger passes through the pipe connection to the low temperature user, and during liquid nitrogen lets in the helium circulating pump, liquid helium dewar and refrigerator passed through the pipeline intercommunication to on communicating the pipeline between helium circulating pump and the heat exchanger. A helium circulating pump and a heat exchanger are arranged in the cryostat, so that a large-flow supercritical helium cooling mode and a forced flow helium cooling mode can be provided, large-flow liquid helium is generated by depending on a low-temperature system, and meanwhile, performance test can be performed on fusion reactor low-temperature users when the low-temperature system is stopped or fails.
Description
Technical Field
The utility model belongs to fusion reactor technique, concretely relates to cryostat subcooling system for low temperature user performance test.
Background
In recent years, the parameter performance of fusion reactors, accelerators, high-intensity magnetic field devices and the like is continuously improved, and the development of large-scale helium low-temperature technology is greatly promoted. At present, helium liquefiers with liquefying capacity from 0.5L/h to thousands of L/h and helium refrigerators with refrigerating capacity from dozens of watts to dozens of kilowatts exist in the world. In fusion devices at home and abroad, such as international thermonuclear reactor (ITER), eastern ultra ring (EAST) of the chinese academy of sciences, nuclear industry southwest physical research institute, number 2M (HL-2M), etc., a liquid helium cryogenic system is adopted by fusion researchers as the most conventional and effective cooling system. The fusion reactor low-temperature user mainly comprises a superconducting magnet, a superconducting coil, a superconducting feeder system, a neutral beam injection cryogenic pump, a Tokamak built-in cryogenic pump, a superconducting electron cyclotron device, a shot injection system and the like, wherein the refrigerating capacity and the liquefaction rate of a refrigerator determine the scale of the cryogenic system. Because the liquid helium consumption of fusion reactor low-temperature users is huge, the use of low-temperature users in the conventional low-temperature system is usually accompanied with the progress of fusion experiments, and the parameter performance test of the low-temperature users is usually only matched with the experimental parameters of the fusion reactor, so that the fusion reactor low-temperature user performance test system has great limitation.
Disclosure of Invention
The utility model aims at providing a cryostat subcooling system for low temperature user capability test can be under normal experimental state and abnormal experimental state during low temperature user parameter capability simulation test, to liquid nitrogen subcooling.
The technical scheme of the utility model as follows:
a supercooling system of a cryostat for testing the performance of a low-temperature user comprises the cryostat, a helium circulating pump and a heat exchanger which are arranged in the cryostat and connected through pipelines, wherein the heat exchanger is connected to the low-temperature user through a pipeline, liquid helium is introduced into the helium circulating pump, and the liquid helium Dewar is communicated with a refrigerator through a pipeline and is communicated to the pipeline between the helium circulating pump and the heat exchanger.
The helium circulating pump and the heat exchanger are located below the liquid helium level.
The purity of the liquid helium is more than 99.999 percent.
The liquid helium dewar is 5000-10000L in volume.
The maximum working pressure of the liquid helium dewar is 10 psi.
The pump head pressure of the helium circulating pump is 0.5-1 bar.
The utility model has the advantages as follows:
liquid helium is supplied to the experiment platform through a liquid conveying pipe, the experiment platform is controlled under the precooling of the liquid helium, a helium circulating pump and a heat exchanger are arranged in a cryostat of main equipment, the supercritical helium cooling and forced flow helium cooling modes with large flow can be provided, and meanwhile, a test element is arranged at the front end of a low-temperature user and used for measuring performance parameters. And the liquid helium after the test is finished enters a liquid helium Dewar through a recovery pipeline to be stored, or directly returns to the low-pressure end of a low-temperature system to finish the whole experimental process.
The high-flow liquid helium is generated by depending on a low-temperature system, and meanwhile, the performance test can be performed on fusion reactor low-temperature users when the low-temperature system is shut down or fails. Wherein, the generated supercritical helium and forced flow helium can be used for low-temperature user performance test. Supercritical helium pressure and temperature fluctuation are uniform, but flow rate is small, forced flow helium pressure and temperature fluctuation are relatively large, and flow rate is also large.
Under a normal experiment mode, liquid helium can be generated by the refrigerator, and after the test is finished, the liquid helium is recovered to the low-pressure end of the low-temperature system to finish circulation; under the abnormal experiment mode, the liquid helium can be pumped by a Dewar, and after the test is finished, the liquid helium is recovered to the Dewar to finish the circulation.
The helium circulating pump can greatly improve the liquid helium flow, and the forced flow cooling helium flow is far larger than the supercritical helium flow.
Drawings
FIG. 1 is a schematic view of the working principle of a low-temperature system supply and control experiment platform for a fusion reactor;
FIG. 2 is a schematic diagram of a cryostat;
in the figure: a. a normal circulation mode, b. an abnormal circulation mode;
1. a cryogenic system; 2. a refrigerator; 3. a liquid helium dewar; 4. an experimental platform; 5. a low temperature user; 6. liquid helium; 7. a helium circulating pump; 8. a heat exchanger; 9. a pressure sensor; 10. a temperature sensor; 11. a flow meter; 12. low-temperature thermostat
Detailed Description
The present invention will be further explained with reference to the drawings and the detailed description.
Under a normal experimental working mode a, a core equipment refrigerator 2 of a low-temperature system 1 is utilized to generate gas-liquid two-phase helium at an outlet through multi-stage heat exchange and turbo expansion, and partial supercritical helium is generated through the helium flow of a throttling valve; storing the generated gas-liquid two-phase helium in a liquid helium Dewar 3, and sending the generated supercritical helium to a low-temperature experiment platform 4; supercooling the liquid nitrogen 6 to 4.3K, sending the liquid nitrogen into a low-temperature experiment platform 4, and entering each low-temperature user 5 through a low-temperature transmission pipeline; the purpose of the cryogenic test platform 4 is to perform adaptive testing of the storage and operation of liquid helium 6 under cryogenic conditions.
After cooling is completed in the cryogenic user 5, the liquid helium 6 is returned to the liquid helium dewar 3 through the refrigerator 2 of the cryogenic system 1.
The liquid left in the liquid helium dewar 3 is used for supercooling the supercritical helium flowing through, and the generated saturated cold helium gas can return to the low-pressure end of the cryogenic system 1 from a gas return pipeline of the liquid helium dewar 3 for recovering cold.
Liquid helium 6 is fed into the cryostat subcooling system for subcooling.
The cryostat subcooling system as shown in figure 2 comprises a cryostat 12, a helium circulation pump 7 and a heat exchanger 8 connected by a pipeline within the cryostat 12, the heat exchanger 8 being connected by a pipeline to a cryogenic user 5, liquid helium 6 being passed into the helium circulation pump 7. Liquid helium is filled in the cryostat 12, the helium circulating pump 7 and the heat exchanger 8 are both below the liquid level of the liquid helium, the length of a valve rod of the helium circulating pump is 1 to 1.2m, and the height of a test Dewar is 1.8 to 2 m.
The liquid helium dewar 3 and the refrigerator 2 are communicated through a pipeline and to a pipeline between the helium circulating pump 7 and the heat exchanger 8.
The helium circulating pump 7 boosts the pressure of the liquid helium 6 to force the liquid helium 6 to flow in the pipeline, the boosted liquid helium 6 firstly enters the heat exchanger 8 for supercooling, then cools each low-temperature user 5 through the low-temperature transmission pipeline, and returns to the liquid helium Dewar 3 for phase separation after cooling. The liquid is left in the liquid helium Dewar 3 and is used for supercooling flowing pressurized helium, and the saturated cold helium gas returns to the low-pressure end of the cryogenic system and is used for recovering cold.
The refrigerator 2 is supercooled by the heat exchanger 8 to generate supercritical helium pressure of more than 2.275bar, the pump head pressure of the helium circulating pump 7 is 0.5-1bar, and the forced flow helium pressure generated by the heat exchanger 8 is more than 1.3 bar.
Wherein, a pressure sensor 9, a temperature sensor 10 and a flowmeter 11 are arranged at the inlet of the low-temperature user 5 and can be used for monitoring and measuring the physical property of the liquid helium fluid.
When the fusion experiment is stopped, the low-temperature system does not work, the refrigerator fails and other abnormal experiment working modes b, the liquid helium 6 stored in the liquid helium Dewar 3 is pumped into the supercooling system of the cryostat in a self-pressurization mode; a helium circulating pump 7 of the supercooling system of the cryostat boosts the pressure of the liquid helium 6, so that the liquid helium 6 flows through a heat exchanger 8 for supercooling, then the low-temperature user 5 is cooled, and the liquid helium enters a liquid helium Dewar 3 for gas-liquid separation after the cooling is finished, so that a forced flow helium cooling circulation is finished;
the liquid helium Dewar 3 is 5000-10000L in volume to ensure that the forced flow helium cooling circulation process is completed for a long time. The maximum operating pressure is 10psi (1bar ≈ 14.5psi) with a loss of 0.5-1.2%/day.
The purity of the liquid helium 6 is more than 99.999%.
The experiment platform 4 adopts liquid nitrogen to pre-cool to 85-90K, is more economical than liquid helium pre-cooling, and can fully utilize the cold energy of the liquid helium.
Claims (6)
1. The utility model provides a cryostat subcooling system for low temperature user performance test, its characterized in that includes cryostat (12), establishes helium circulating pump (7) and heat exchanger (8) through the pipe connection in cryostat (12), and heat exchanger (8) are through pipe connection to low temperature user (5), and liquid helium (6) lets in helium circulating pump (7), and liquid helium dewar (3) and refrigerator (2) are through the pipeline intercommunication to communicate on the pipeline between helium circulating pump (7) and heat exchanger (8).
2. A cryostat subcooling system for use in cryogenic user performance testing according to claim 1, wherein: the helium circulating pump (7) and the heat exchanger (8) are positioned below the plane of the liquid helium (6).
3. A cryostat subcooling system for use in cryogenic user performance testing according to claim 2, wherein: the purity of the liquid helium (6) is more than 99.999 percent.
4. A cryostat subcooling system for use in cryogenic user performance testing according to claim 2, wherein: the liquid helium Dewar (3) is 5000-10000L in volume.
5. A cryostat subcooling system for use in cryogenic user performance testing according to claim 2, wherein: the maximum working pressure of the liquid helium Dewar (3) is 10 psi.
6. A cryostat subcooling system for use in cryogenic user performance testing according to claim 2, wherein: the pump head pressure of the helium circulating pump (7) is 0.5-1 bar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821993359.3U CN209822289U (en) | 2018-11-29 | 2018-11-29 | A cryostat subcooling system for low temperature user performance test |
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| CN201821993359.3U CN209822289U (en) | 2018-11-29 | 2018-11-29 | A cryostat subcooling system for low temperature user performance test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111243767A (en) * | 2018-11-29 | 2020-06-05 | 核工业西南物理研究院 | Low-temperature user parameter simulation experiment method and low-temperature thermostat supercooling system |
| WO2023143641A1 (en) * | 2022-01-29 | 2023-08-03 | 中国科学院合肥物质科学研究院 | Device for providing liquid helium forced-flow cooling working medium |
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2018
- 2018-11-29 CN CN201821993359.3U patent/CN209822289U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111243767A (en) * | 2018-11-29 | 2020-06-05 | 核工业西南物理研究院 | Low-temperature user parameter simulation experiment method and low-temperature thermostat supercooling system |
| WO2023143641A1 (en) * | 2022-01-29 | 2023-08-03 | 中国科学院合肥物质科学研究院 | Device for providing liquid helium forced-flow cooling working medium |
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