WO2022196952A1 - 초전도 한류기의 냉각 제어장치 - Google Patents
초전도 한류기의 냉각 제어장치 Download PDFInfo
- Publication number
- WO2022196952A1 WO2022196952A1 PCT/KR2022/002153 KR2022002153W WO2022196952A1 WO 2022196952 A1 WO2022196952 A1 WO 2022196952A1 KR 2022002153 W KR2022002153 W KR 2022002153W WO 2022196952 A1 WO2022196952 A1 WO 2022196952A1
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- Prior art keywords
- temperature
- liquid coolant
- container
- pressure
- saturated liquid
- Prior art date
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 39
- 239000002826 coolant Substances 0.000 claims abstract description 122
- 239000011555 saturated liquid Substances 0.000 claims abstract description 69
- 239000013526 supercooled liquid Substances 0.000 claims abstract description 53
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 7
- 230000005856 abnormality Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 26
- 239000007788 liquid Substances 0.000 description 24
- 229910052757 nitrogen Inorganic materials 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000002887 superconductor Substances 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 6
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 101100365516 Mus musculus Psat1 gene Proteins 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/023—Current limitation using superconducting elements
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D16/00—Devices using a combination of a cooling mode associated with refrigerating machinery with a cooling mode not associated with refrigerating machinery
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20236—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures by immersion
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/30—Devices switchable between superconducting and normal states
Definitions
- the present invention relates to a cooling control device for a superconducting fault current limiter, and more particularly, to a cooling control device for a non-circulating superconducting fault current limiter.
- the superconducting fault current limiter refers to a device that uses the superconductivity of a superconductor to input impedance to the system, thereby limiting the circuit breaker to a capacity that can be interrupted when a fault current occurs.
- the superconductor applied to the superconducting current limiter exhibits zero resistance at a specific temperature and below a specific current, and when an unexpected accident occurs in the power system, the superconducting property is destroyed and transitions to a normal conduction state, showing high resistance.
- the superconductor of the superconducting current limiter must be cooled by a cooling device to maintain the superconducting state.
- the power consumption for lowering from 60K to 50K is increased by about 20% compared to the power consumption for lowering the absolute temperature from 80K to 70K.
- Korean Patent Application Laid-Open No. 10-2008-0102157 (a multi-bath device for cooling a superconductor and a method for cooling a superconductor, published on November 24, 2008).
- the above publication includes a cooling bath for cooling the superconductor and a shield bath surrounding the cooling bath, and the cooling bath is supercooled, and the pressure of the shield bath is adjusted to maintain a saturated state.
- the freezer is located on the inside top of the shield bath.
- the refrigerator does not come into contact with the liquid nitrogen in the shield bath, and serves to re-liquefy the saturated liquid nitrogen in a state in which it is phase-changed to a gas.
- the above publication includes a configuration in which a cryogenic storage tank is separately provided, and liquid nitrogen is supplied to the shield bath in order to compensate the liquid level of the shield bath.
- the prior art having such a configuration has a problem in that space and cost loss occurs due to the operation of a cryogenic storage tank for storing liquid nitrogen.
- a temperature sensor for directly detecting the supercooling temperature of the cooling bath and the saturation temperature of the shield bath is provided, and the refrigerator is controlled according to the detected temperature.
- An object of the present invention to be solved in view of the above problems is to provide a cooling control device for a superconducting current limiter capable of detecting the temperature of a saturated liquid coolant using a lower cost means.
- a cooling control device for a superconducting current limiter capable of estimating the temperature of the saturated liquid coolant by detecting the internal pressure of the current limiter without directly detecting the temperature of the saturated liquid coolant.
- Another object of the present invention is to provide a cooling control device for a superconducting fault current limiter that is easy to maintain and advantageous in maintaining pressure in addition to the above object.
- Another object of the present invention is to provide a cooling control device for a superconducting current limiter that can provide redundancy for temperature detection by using a temperature sensor that directly detects the temperature of a saturated liquid coolant.
- Another object of the present invention is to provide a cooling control device for a superconducting fault current limiter that can ensure uniformity of cooling temperature of a superconducting element by activating circulation of a supercooled liquid coolant to secure temperature uniformity.
- another object of the present invention is to provide a cooling device for a superconducting current limiter that is very advantageous for maintaining the pressure of the first container in which the supercooled liquid coolant is accommodated.
- the cooling control device for a superconducting current limiter of the present invention includes a superconducting current limiter for cooling a saturated liquid coolant with a refrigerator to maintain the temperature of a supercooled liquid coolant in which a superconducting element is immersed, and the superconducting current limiter a pressure sensor for detecting the pressure of the second container in which the saturated liquid coolant of It may include a control unit for performing temperature control of the refrigerator.
- the present invention comprises a first vessel containing a supercooled liquid coolant, and a second vessel surrounding the exterior of the first vessel and containing a saturated liquid coolant, wherein by detecting the internal pressure of the second vessel, By estimating the temperature, the cost can be reduced, maintenance and repair are easy, and there is an advantageous effect in maintaining the internal pressure of the second container.
- the present invention has the effect of activating the circulation in the first container by the partial temperature difference of the supercooled liquid coolant by positioning the second container in contact with only the upper side of the first container, thereby ensuring the temperature uniformity of the superconducting element there is
- the present invention sets the level of the saturated liquid coolant in the second container to be higher than the liquid level of the supercooled liquid coolant in the first container, so that the wall surface of the first container acts as a condensation surface to maintain the internal pressure of the first container. has a beneficial effect.
- the present invention detects the internal pressure of the first container and converts the detected pressure into temperature to reduce the cost by minimizing the use of a temperature sensor capable of detecting ultra-low temperature, and also inserts, installs, and seals the temperature sensor By simplifying the complex configuration for maintenance, maintenance is advantageous and has the effect of improving pressure retention performance.
- FIG. 1 is a block diagram of a cooling control device for a superconducting fault current limiter according to a preferred embodiment of the present invention.
- FIG. 3 is a block diagram of another embodiment of the present invention including a temperature sensor.
- 5 and 6 are each a block diagram of a cooling control device of a superconducting fault current limiter according to another embodiment of the present invention.
- control unit 61 processor
- FIG. 1 is a block diagram of a cooling control device for a superconducting fault current limiter according to a preferred embodiment of the present invention.
- the present invention provides a first container 10 accommodating a supercooled liquid coolant 12 in which a superconducting element 11 is immersed, and a first container 10 to cover the side and bottom surfaces of the first container 10 .
- a second container 20 positioned in contact with the outer surface of the container 10 and accommodating the saturated liquid coolant 21 , and a third container in contact with side surfaces and bottom surfaces of the first container 10 and the second container 20 .
- the first container 10 provides a cylindrical accommodation space, the superconducting element 11 is provided inside.
- the superconducting element 11 may be provided with the same number as the constant number of the power system.
- three superconducting elements 11 may be used in the three-phase power system.
- the superconducting element 11 is immersed in the supercooled liquid coolant 12 in the first container 10, and the temperature is maintained by the supercooled liquid coolant 12 so that the resistance is close to zero in the state before the fault current is generated. keep the status
- the supercooled liquid coolant 12 may be liquid nitrogen.
- the internal pressure P1 of the first container 10 is 3 bar, and the temperature of the supercooled liquid coolant 12 is 77K as a normal reference temperature.
- a non-condensable gas is injected in order to maintain the internal pressure P1 of the first container 10 .
- the non-condensable gas include gaseous neon and helium, and the space above the supercooled liquid coolant 12 of the first container 10 is filled with a gas mixture of gaseous neon and gaseous helium to maintain the pressure.
- the supercooled liquid coolant 12 accommodated in the first container 10 is not exchanged unless there is a special reason, and the temperature is maintained while maintaining the installed state.
- the temperature of the supercooled liquid coolant 12 in the first container 10 is maintained by the action of the saturated liquid coolant 21 in the second container 20 and the freezer 40 .
- the pressure P2 in the second vessel 20 is maintained below 1 bar, and the temperature of the saturated liquid coolant 21 should be maintained at a temperature below 77K.
- the saturated liquid coolant 21 may also use liquid nitrogen.
- the temperature of the saturated liquid coolant 21 is preferably 75 to 76K.
- the inner wall of the second container 20 may be advantageous for heat exchange by using a portion of the outer wall of the first container 10 as it is.
- the liquid level of the saturated liquid coolant 21 accommodated in the second container 20 may be the same as that of the supercooled liquid coolant 12 accommodated in the first container 10, and for other examples, more It will be described in detail.
- a plurality of refrigerators 40 are coupled to one surface, for example, an upper surface of the second container 20 , and the cold head of the refrigerator 40 is drawn into the inside of the second container 20 .
- heat exchange is made between the saturated liquid coolant 21 in the second container 20 and the supercooled liquid coolant 12 in the first container 10, wherein the heat exchange is between the saturated liquid coolant 21 and the supercooled liquid coolant (12) is made through a portion of the outer wall of the first container (10) between.
- a portion of the saturated liquid coolant 21 is vaporized by heat exchange, and the supercooled liquid coolant 12 maintains its temperature.
- the vaporized saturated liquid coolant 21 is again condensed and liquefied by the refrigerator 40 , and the liquefied liquid falls by gravity and mixes with the saturated liquid coolant 21 repeatedly.
- the present invention can maintain the temperature of the supercooled liquid coolant 12 and the superconducting element 11 without circulating the saturated liquid coolant 21 .
- the temperature of the saturated liquid coolant 21 is maintained at a temperature lower than the temperature of the supercooled liquid coolant 12, and at this time, the temperature of the saturated liquid coolant 21 is detected to perform appropriate refrigerator 40 control. .
- the present invention detects the internal pressure P2 of the second container 20 using the pressure sensor 50 .
- the pressure detection result of the pressure sensor 50 is provided to the control unit 60 .
- the control unit 60 includes an analog-to-digital converter 62 that converts the analog output of the pressure sensor 50 into a digital signal, a memory 63 that stores a correlation data table between pressure and temperature, and the analog-to-digital conversion
- the processor 61 receives the pressure information from the unit 62 and estimates the temperature of the saturated liquid coolant 21 using the table stored in the memory 63, and the refrigerator 40 under the control of the processor 61 ) includes a temperature controller 64 for controlling the temperature of the.
- the pressure-temperature correlation data table stored in the memory 63 uses a phase diagram of the saturated liquid coolant.
- FIG. 2 shows a saturation diagram of liquid nitrogen as an example of a saturated liquid coolant 21 .
- the phase of the saturated liquid coolant 21 is determined according to temperature and pressure.
- liquid nitrogen is saturated at a temperature of 75 to 76 K and a pressure of 70 to 90 kPa (0.7 to 0.9 bar). That is, the temperature and pressure should be determined along the section (M) of the saturation diagram in the drawing.
- the saturated liquid coolant 21 maintains a saturated state, and when the temperature is increased by heat exchange with the supercooled liquid coolant 12, it is vaporized.
- the processor 61 detects a temperature indicated by the detected pressure using the pressure-temperature correlation data table stored in the memory 63, and performs control to increase or decrease the temperature of the refrigerator 40 according to the detected temperature. do.
- the processor 61 may control the temperature controller 64 to control the temperature of the refrigerator 40 , thereby controlling the degree of condensation of vaporized liquid nitrogen to maintain the pressure P2 .
- the maintenance of the pressure P2 is related to the temperature of the refrigerator 40 , and the temperature of the saturated liquid coolant 21 is also determined according to the temperature of the refrigerator 40 .
- the present invention can reduce the cost by estimating the temperature of the saturated liquid coolant 21 by detecting the pressure P2 without directly detecting the temperature of the saturated liquid coolant 21 .
- the pressure sensor 50 is not immersed in the saturated liquid coolant 21 and has a structure that can be easily replaced in a part of the second container 20, maintenance and repair are easy, improving the reliability and convenience of the current limiter operation There is an effect that can make it happen.
- the present invention may further include a temperature sensor immersed in the saturated liquid coolant 21 together with the pressure sensor 50 , and may be operated in a redundancy structure.
- FIG 3 shows the superconducting current limiter cooling control device of the present invention including the temperature sensor 70 .
- both the pressure sensor 50 for detecting the internal pressure of the second container 20 and the temperature sensor 70 for directly detecting the temperature of the saturated liquid coolant 21 filled in the second container 20 can be used. have.
- the temperature of the saturated liquid coolant 21 may be detected using the temperature sensor 70 , and the operation of the refrigerator 40 may be controlled according to the detection result.
- the temperature sensor 70 can be judged above.
- the temperature controller 64 not only controls the refrigerator 40, but also controls the heater for heating the second container 20, although not shown in the drawing, so that the temperature of the saturated liquid coolant 21 is lower than the set temperature.
- a heater may be used to adjust the temperature of the saturated liquid coolant 21 to a normal range.
- the pressure P in the second container 20 is detected using the pressure sensor 50 ( S41 ).
- the detected pressure P is converted into a digital signal through the analog-to-digital conversion unit 62 and provided to the processor 61 .
- the processor 61 compares the detected pressure P with the saturation pressure Psat as in steps S42 and S43.
- the saturation pressure Psat is a pressure in the range of the temperature T of 75 to 77K, and as in step S42, it is determined whether the detected pressure P is greater than the pressure when the temperature is 77K.
- step S44 When the detected pressure P is greater than the saturation pressure at 77K, the cooling power of the temperature controller 64 is increased as in step S44, and operation of the heater is stopped as in step S45.
- step S42 if the detected pressure P is smaller than the saturation pressure at 77K, as in step S43, it is determined whether the detected pressure P is smaller than the saturation pressure at 75K, and if not, step S41 return to
- the temperature controller 64 lowers the cooling power of the refrigerator 40 and operates the heater to adjust the temperature of the saturated liquid coolant 21 to a range of 75 to 77K.
- 5 is a block diagram of a superconducting current limiter cooling control device according to another embodiment of the present invention.
- the second container 20 may be configured to be located only on the upper side of the first container 10 .
- the second container 20 is positioned to expose the side lower side and the bottom of the first container 10, so that heat exchange with the saturated liquid coolant 21 is performed with the supercooled liquid coolant ( 12) occurs on the lateral side.
- the second container 20 may cover about 50% of the height of the side surface downward from the upper end of the side surface of the first container 10 . More specifically, 40 to 60% may be covered.
- the second container 20 has a ring-type structure exposing the lower side and the bottom of the first container 10, and provides an internal space of the same shape.
- the inner wall of the second container 20 may be advantageous for heat exchange by using a portion of the outer wall of the first container 10 as it is.
- the liquid level of the saturated liquid coolant 21 accommodated in the second container 20 may be the same as that of the supercooled liquid coolant 12 accommodated in the first container 10, and for other examples, more It will be described in detail.
- a plurality of refrigerators 40 are coupled to one surface, for example, an upper surface of the second container 20 , and the cold head of the refrigerator 40 is drawn into the inside of the second container 20 .
- heat exchange is made between the saturated liquid coolant 21 in the second container 20 and the supercooled liquid coolant 12 in the first container 10, wherein the heat exchange is between the saturated liquid coolant 21 and the supercooled liquid coolant (12) is made through a portion of the outer wall of the first container (10) between.
- a portion of the saturated liquid coolant 21 is vaporized by heat exchange, and the supercooled liquid coolant 12 maintains its temperature.
- the vaporized saturated liquid coolant 21 is again condensed and liquefied by the refrigerator 40 , and the liquefied liquid falls by gravity and mixes with the saturated liquid coolant 21 repeatedly.
- the supercooled liquid coolant 12 of the first container 10 mainly undergoes heat exchange at the upper side where the second container 20 is covered.
- region A is an upper region where heat exchange occurs with the saturated liquid coolant 21 of the second container 20 , and heat exchange does not occur in region B of the lower layer.
- the present invention limits the contact surface between the second container 20 and the first container 10 to a part, and induces a partial thermal imbalance in the supercooled liquid coolant 12 inside the first container 10 according to heat exchange. , form convection.
- the supercooled liquid coolant 12 in the first container 10 circulates on its own to achieve temperature equilibrium, and thus temperature uniformity can be increased.
- Such temperature uniformity can cool the superconducting element 11 to a uniform temperature as a whole, and the resistance uniformity of the superconducting element 11 itself can also be ensured by ensuring the temperature uniformity of the superconducting element 11 .
- the third container 30 has a structure that surrounds both the side and bottom surfaces of the second container 20 and the exposed side and bottom surfaces of the first container 10, and the inner side blocks heat transfer in a vacuum 31 state. It is advantageous for maintaining the temperature of the supercooled liquid coolant 12 and the saturated liquid coolant 21 in the first container 10 and the second container 20 .
- the pressure detection of the second container 20 using the pressure sensor 50 and the configuration and action of controlling the refrigerator 40 by estimating the temperature using the detected pressure are the configurations and actions described with reference to FIG. 1 and It is assumed that the action is applied as it is.
- FIG. 6 is a block diagram of a cooling control device of a superconducting fault current limiter according to another embodiment of the present invention.
- FIG. 6 The configuration shown in FIG. 6 is the same as the example described with reference to FIG. 3 , the first container 10 , and the second container 20 and the first container 10 positioned around the outer part of the first container 10 . ) and a third container 30 surrounding the side and bottom surfaces of the second container 20 .
- the superconducting element 11 is accommodated in the inner receiving space of the first container 10 , and the superconducting element 11 is completely submerged in the supercooled liquid coolant 12 .
- the liquid level of the supercooled liquid coolant 12 is higher than that of the superconducting element 11 .
- the temperature of the supercooled liquid coolant 12 is appropriately about 77K, and a non-condensed gas is injected into the space of the first container 10 on the upper side of the supercooled liquid coolant 12 to be maintained at a pressure of 3 bar. make it possible
- the temperature of the supercooled liquid coolant 12 is maintained at 77K, and when the pressure is 3 bar, in theory, the supercooled liquid coolant 12 is not vaporized, but the supercooled liquid coolant 12 is vaporized due to temperature deviation or other reasons. An increase in the pressure of the container 10 may occur.
- a change in pressure inside the first container 10 becomes a factor that changes the overall phase equilibrium, and it is necessary to keep the pressure constant.
- the liquid level L2 of the saturated liquid coolant 21 inside the second container 20 is set to be higher than the liquid level L1 of the supercooled liquid coolant 12 in the first container 10. do.
- a portion of the outer wall of the first container 10 corresponding to the difference (L2-L1) between the liquid level L2 of the saturated liquid coolant 21 and the liquid level L1 of the supercooled liquid coolant 12 has a temperature compared to the other outer wall areas becomes the lower region, which is called the condensing surface 13 .
- the height of the condensation surface 13, that is, the difference in height between the liquid level L2 of the liquid coolant 21 and the level L2 of the supercooled liquid coolant 12 is 5 to 30 cm.
- the condensation effect is low, and when it exceeds 30 cm, unnecessary waste of energy may occur.
- gaseous nitrogen which is the supercooled liquid coolant 21 vaporized in the first vessel 10
- gaseous nitrogen is the supercooled liquid coolant 21 vaporized in the first vessel 10
- the condensing surface 13 where the temperature is below the condensing temperature
- the saturated liquid coolant 21 contained in the second container 20 exchanges heat with the supercooled liquid coolant 12 in the first container 10 and the supercooled liquid coolant vaporized in the condensing surface 13 ( 12) is condensed, and the temperature rises to vaporize.
- the vaporized saturated liquid coolant 21 repeats the process of being condensed by the cold head of the refrigerator 40 to maintain the temperature of the saturated liquid coolant 21 and the supercooled liquid coolant 12 and the first container 10 pressure can be maintained within the
- the present invention relates to a device capable of maintaining the temperature of a saturated liquid coolant and a supercooled liquid coolant using the laws of nature, and has industrial applicability.
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Abstract
Description
Claims (4)
- 포화 액체 냉각제를 냉동기로 냉각시켜, 초전도 소자가 침지된 과냉각 액체 냉각제의 온도를 유지하는 초전도 한류기;상기 초전도 한류기의 상기 포화 액체 냉각제가 수용된 제2용기의 압력을 검출하는 압력센서; 및상기 압력센서의 압력 검출결과를 이용하여, 상기 포화 액체 냉각제의 온도를 추정하고, 추정된 상기 포화 액체 냉각제의 온도에 따라 상기 냉동기의 온도 제어를 수행하는 제어장치부를 포함하는 초전도 한류기의 냉각 제어장치.
- 제1항에 있어서,상기 제어장치부는,상기 압력센서의 압력 검출 결과를 디지털 신호로 변환하는 아날로그 디지털 변환부;상기 아날로그 디지털 변환부의 디지털 신호를 수신하여 상기 포화 액체 냉각제의 온도를 추정하는 프로세서; 및상기 프로세서의 제어에 따라 상기 초전도 한류기의 냉동기를 제어하는 온도 제어기를 포함하는 초전도 한류기의 냉각 제어장치.
- 제2항에 있어서,상기 포화 액체 냉각제의 온도를 직접 검출하는 온도센서를 더 포함하여,상기 온도센서에서 검출된 온도와 상기 제어장치부에서 추정된 온도의 차가 설정값 이상이면 상기 온도센서에 이상이 있는 것으로 판단하는 초전도 한류기의 냉각 제어장치.
- 제3항에 있어서,상기 과냉각 액체 냉각제를 가열하는 히터를 더 포함하며,상기 온도 제어기는, 상기 냉동기 및 상기 히터를 제어하여 상기 포화 액체 냉각제의 온도를 제어하는 것을 특징으로 하는 초전도 한류기의 냉각 제어장치.
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JP2009267273A (ja) * | 2008-04-29 | 2009-11-12 | Mitsubishi Electric Corp | 超電導電磁石 |
JP5017640B2 (ja) * | 2006-05-31 | 2012-09-05 | 国立大学法人京都大学 | 極低温冷凍方法および極低温冷凍システム |
KR20130033062A (ko) * | 2011-09-26 | 2013-04-03 | 한국전력공사 | 초전도 한류기 압력제어시스템 |
US20160233011A1 (en) * | 2013-07-11 | 2016-08-11 | Mitsubishi Electric Corporation | Superconducting magnet |
JP2017537296A (ja) * | 2014-12-10 | 2017-12-14 | ブルーカー バイオスピン ゲゼルシヤフト ミツト ベシユレンクテル ハフツングBruker BioSpin GmbH | 少なくとも下層部分において互いに液密に分割された第1のヘリウム槽と第2のヘリウム槽とを有するクライオスタット |
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JP2009267273A (ja) * | 2008-04-29 | 2009-11-12 | Mitsubishi Electric Corp | 超電導電磁石 |
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JP2017537296A (ja) * | 2014-12-10 | 2017-12-14 | ブルーカー バイオスピン ゲゼルシヤフト ミツト ベシユレンクテル ハフツングBruker BioSpin GmbH | 少なくとも下層部分において互いに液密に分割された第1のヘリウム槽と第2のヘリウム槽とを有するクライオスタット |
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