WO2006001203A1 - Système de refroidissement pour appareil électrique supraconducteur - Google Patents

Système de refroidissement pour appareil électrique supraconducteur Download PDF

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Publication number
WO2006001203A1
WO2006001203A1 PCT/JP2005/010936 JP2005010936W WO2006001203A1 WO 2006001203 A1 WO2006001203 A1 WO 2006001203A1 JP 2005010936 W JP2005010936 W JP 2005010936W WO 2006001203 A1 WO2006001203 A1 WO 2006001203A1
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WO
WIPO (PCT)
Prior art keywords
gas
reservoir tank
liquid
cooling system
pressure
Prior art date
Application number
PCT/JP2005/010936
Other languages
English (en)
Japanese (ja)
Inventor
Shinichi Mukoyama
Noboru Ishii
Masashi Yagi
Satoru Maruyama
Tatsuki Okamoto
Hiroshi Suzuki
Michiharu Ichikawa
Toshihiro Takahashi
Shirabe Akita
Original Assignee
The Furukawa Electric Co., Ltd.
Central Research Institute Of Electric Power Industry
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Furukawa Electric Co., Ltd., Central Research Institute Of Electric Power Industry filed Critical The Furukawa Electric Co., Ltd.
Priority to US11/630,889 priority Critical patent/US20080202127A1/en
Priority to EP05751512A priority patent/EP1780482A4/fr
Priority to CN2005800196798A priority patent/CN1969158B/zh
Priority to KR1020067019841A priority patent/KR101142901B1/ko
Publication of WO2006001203A1 publication Critical patent/WO2006001203A1/fr

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Classifications

    • 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
    • F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/16—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by cooling
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • 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
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • 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
    • F17C2270/00—Applications
    • F17C2270/05—Applications for industrial use
    • F17C2270/0527—Superconductors
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/04—Refrigerant level
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/04—Cooling

Definitions

  • the present invention relates to a cooling system for cooling superconducting cables, superconducting bus lines, SMES, superconducting transformers, etc., which can be industrially used in a superconducting state after being cooled by a liquefied gas such as liquid nitrogen.
  • the present invention relates to a cooling system for cooling superconducting power equipment in which equipment is operated in a high voltage state.
  • the superconducting cable In the case of cooling a superconducting cable, if the liquefied gas to be circulated is in a gas-liquid mixed state, the pressure loss increases and the required amount of liquefied gas cannot be circulated stably, resulting in a large capacity. It is necessary to prepare a large circulation pump.
  • the superconducting cable employs a cryogenic electrical insulation system that maintains high electrical insulation performance by impregnating the liquefied gas into the insulator, so that gases and bubbles are mixed in the liquid gas. If so, there is a problem that the electrical insulation performance is significantly lowered.
  • the liquid gas is always maintained in the subcooled state and circulated without being vaporized.
  • the reservoir The tank 101 is pressurized by supplying hydrogen (H) or helium (He), which is a gas whose triple point is sufficiently lower than the liquid gas, with a cylinder 123, etc.
  • Patent Document 1 Japanese Patent Laid-Open No. 08-148044
  • the amount dissolved in the liquid nitrogen is very small.
  • the liquid gas in which the He gas is dissolved is circulated, for example, the portion where the flow rate of the liquefied gas that the pipe expands becomes relatively slow, or for example, In a part where the pressure of the liquid gas suddenly decreases, such as after being throttled by a valve from the reservoir tank, the dissolved He gas cannot be maintained in the liquid gas. As a result, bubbles are formed and mixed in liquid nitrogen to be in a gas-liquid mixed state.
  • an object of the present invention is to provide an instability factor of the circulation of the liquid gas, because the gas having a lower boiling point than the liquid gas used for pressurization is dissolved in the liquid gas. It is an object to provide a cooling system for superconducting power equipment that can circulate liquid gas smoothly in a subcooled state for a long period of time without causing problems related to insulation.
  • the present inventor has intensively studied to solve the above-described problems of the prior art.
  • a small amount of He gas dissolves in liquid nitrogen by pressurizing the reservoir tank, which is conventionally not used as pressurized gas, with the same type of gas as liquid gas.
  • the He gas becomes bubbles, mixed into the liquid nitrogen and becomes a gas-liquid mixed state, and the circulation of the liquid nitrogen cannot be smoothly performed, and the insulation characteristics are improved. It has been found that the problem of deterioration can be solved.
  • the height difference due to the arrangement of superconducting power equipment exceeds the specified value, the generated bubbles will stay in the upper part of the equipment and fill the cooling loop, making it impossible to circulate liquid nitrogen. It turns out that it can be solved.
  • the liquid level of the reservoir tank that stores the liquid gas in a pressurized state is at least the depth of the pressurized gas dissolved + the liquid level movement correction amount from the outlet of the return line of the circulating liquefied gas
  • the nitrogen gas used for pressurization is liquefied, and the pressurized pressure is reduced. If the cylinder gas is not continuously supplied, the pressure is kept constant. It has been found that the problem of not being able to be solved can be solved. Therefore, the problem that a large amount of nitrogen gas is consumed and a large amount of liquid heat is brought into the cooling system and the heat load increases is solved.
  • the present invention has been made based on the above research results, and the first aspect of the cooling system for a superconducting power device according to the present invention is a reservoir tank for storing liquid gas, a circulation pump, and liquid gas. And a circulation loop through which the liquefied gas circulates, and the liquid gas is circulated in a subcooled state using a circulation pump to superconducting power.
  • a superconducting power equipment cooling system for cooling equipment further comprising pressurizing means for pressurizing the reservoir tank with the same kind of gas as the liquid gas, and storing the liquefied gas in a pressurized state.
  • the cooling system for a superconducting power device characterized in that the surface is positioned at least above the outlet of the return line of the circulating liquid gas and gas by at least the penetration depth of the pressurized gas + the liquid level movement correction amount It is.
  • the pressurizing means for pressurizing the reservoir tank with the same kind of gas as the liquefied gas stores the same kind of gas as the liquefied gas at a high pressure. It is a cooling system for superconducting power equipment characterized by comprising pressurizing at a predetermined pressure from a gas cylinder through a pressure regulating valve.
  • the pressurizing means for pressurizing the reservoir tank with the same kind of gas as the liquefied gas delivers the liquefied gas in a reservoir tank force subcooled state. It consists of pressurizing the reservoir tank using the discharge pressure of the circulation pump by piping returning from the outlet of the circulation pump to a part of the liquid gas sent to the superconducting power device and returning to the reservoir tank. This is a cooling system for superconducting power equipment.
  • the pressurizing means for pressurizing the reservoir tank with the same kind of gas as the liquefied gas sends out the liquefied gas in the subcooled state of the reservoir tank.
  • Vaporizer that vaporizes liquid gas and pressure adjustment for pressure adjustment provided in piping that branches from a part of the liquid gas sent to the superconducting power equipment from the outlet of the circulation pump and returns to the reservoir tank It is a cooling system for superconducting power equipment, characterized by comprising a valve.
  • a fifth aspect of the cooling system for a superconducting power apparatus further includes auxiliary means for the pressurizing means, and the auxiliary means supplies the same kind of gas as the liquid gas from the gas cylinder. It is a cooling system for superconducting power equipment characterized by comprising pressurizing
  • a sixth aspect of the cooling system for a superconducting power device further comprises auxiliary means for the pressurizing means, and the auxiliary means has a heating device disposed in a gas phase portion of the reservoir tank, Consisting of superheated volume expansion of the gas in the gas phase of the reservoir tank.
  • the reservoir tank is pressurized with the same kind of gas as the liquid gas, so that the liquid nitrogen is smoothly circulated without bubbles being mixed in the liquid nitrogen, and the superconducting power device having excellent insulation characteristics Cooling system can be provided.
  • the liquid level of the reservoir tank that stores the liquefied gas in a pressurized state is at least the depth of penetration of the pressurized gas plus the liquid level from the outlet of the return line of the circulating liquid gas. Since it is located at the top by the amount of movement correction, it is possible to provide a cooling system for superconducting power equipment in which the pressure used without pressurizing the gas used to pressurize the reservoir tank does not decrease. it can.
  • FIG. 1 is a diagram illustrating a method of pressurizing a reservoir tank with a circulation pump outlet pressure according to the present invention.
  • FIG. 2 is a configuration diagram of a cooling system for explaining Example 1 of the present invention.
  • FIG. 3 is a configuration diagram in the vicinity of a reservoir tank for explaining Example 2 of the present invention.
  • FIG. 4 is a configuration diagram in the vicinity of a reservoir tank for explaining Example 3 of the present invention.
  • FIG. 5 is a diagram showing the relationship between the pressure gas penetration depth [m] and the pressure reduction rate [%].
  • FIG. 6 is a diagram for explaining a conventional superconducting cable cooling system.
  • the cooling system for superconducting power equipment includes a reservoir tank for storing liquid gas, a circulation pump, a heat exchanger for cooling the liquid gas, and a circulation loop for circulating the liquid gas, ,
  • a superconducting power equipment cooling system that circulates in a subcooled state using a circulation pump to cool superconducting power equipment, further comprising pressurizing means for pressurizing the reservoir tank with the same kind of gas as the liquid gas.
  • Liquid level force of reservoir tank that stores pressurized gas under pressure At least the depth of the pressurized gas dissolved + the level shift correction amount above the outlet of the return line of the circulating liquid gas Specially located This is a cooling system for superconducting power equipment.
  • the liquid level of the reservoir tank that stores the liquid gas in a pressurized state is at least higher than the outlet of the return line of the circulating liquefied gas by at least the penetration depth of the pressurized gas + the liquid level movement correction amount. The need to be located is explained below.
  • Figure 5 shows the relationship between the pressure gas penetration depth [m] and the pressure reduction rate [%].
  • FIG. 5 the depth at which the pressurized gas melts into the liquid level of the reservoir tank (that is, the depth at which the pressurized gas penetrates) is plotted on the horizontal axis. The reduction rate is shown on the vertical axis.
  • a reservoir tank having an inner diameter of lm and a height of lm was used, and the pressure was set to 0.3 MPa.
  • the penetration depth is up to 10 cm
  • the rate of decrease in pressure is remarkably large
  • the penetration depth is up to about 20 cm
  • the gaseous nitrogen gas used for pressurization becomes liquid. Condensed and pressurized pressure is still decreasing rapidly.
  • the penetration depth was kept at 20 cm or more, it was found that the pressure decrease could be kept at a small value of 1% or less.
  • the liquid level changes due to the influence of the temperature and pressure of liquid nitrogen, so it is necessary to consider the liquid level movement correction amount.
  • the liquid level force of the reservoir tank that stores the liquid gas in a pressurized state is at least the depth of penetration of the pressurized gas from the outlet of the return line of the circulating liquid gas + the liquid level movement correction amount It is only necessary to be located at the top.
  • the depth of penetration of the pressurized gas (20 cm) + the liquid level movement correction amount (30 cm) is preferably 50 cm or more.
  • the required depth is almost the same even if the size of the reservoir tank depends on the container shape is small. Therefore, in the system of the present application, the container height of the reservoir tank needs to be high enough to ensure the required depth (preferably 50 cm or more).
  • the present invention is a system that cools a superconducting power device with liquid gas.
  • a gas having a lower boiling point than the liquid gas used for pressurization is a liquid gas. It provides a cooling system that can circulate liquefied gas in a subcooled state for a long time without causing instability in the circulation of liquefied gas and troubles related to insulation of electrical equipment. .
  • the pressurizing means for pressurizing in the above-described state consists of pressurizing the reservoir tank to a predetermined pressure with the same kind of gas as the liquid gas stored in the reservoir tank.
  • the reservoir tank liquid level is at least 20 cm above the outlet of the circulation pump return pipe in the reservoir tank. Preferably it is 50 cm or higher.
  • means for pressurization in addition to means for pressurization with a high-pressure gas cylinder, there is a means for pressurization by returning the circulation pump outlet pressure higher than the pressure of the reservoir tank to the reservoir tank.
  • the outlet pipe of the circulation pump that pumps and pressurizes the reservoir tank fluid and feeds it to the superconducting power equipment is branched, and the liquid gas is discharged from the pressure of the reservoir tank.
  • a part is taken out, the branched liquefied gas is gasified using a gasifier, and further the reservoir is connected via a pressure regulating valve that opens and closes according to the pressure for maintaining the pressure of the reservoir tank at a predetermined pressure.
  • liquid nitrogen is used as the liquid gas.
  • the boiling point of liquid nitrogen at atmospheric pressure (1.013 MPa) is 77K.
  • the boiling point of liquid nitrogen becomes 90K or higher. Therefore, when 77K liquid nitrogen is pressurized to 0.3MPa, the liquid nitrogen enters a subcooled state where no bubbles are generated.
  • the circulation pump's liquid withdrawal section is located at the bottom of the reservoir tank and is connected to the circulation pump by piping.
  • the return pipe of the circulation is a force connected to the reservoir tank.
  • the position of the outlet of the pipe is lower than the liquid level.
  • the liquid gas delivered from the circulation pump cools the superconducting power equipment and returns to the reservoir tank.
  • the piping outlet is located below the liquid level, the returned liquid gas does not touch the pressurized gas phase of the reservoir tank, moves to the liquid nitrogen inlet of the circulation pump, and circulates again. To do.
  • the position of the liquid level is set higher than a predetermined height (20 cm 2) of the liquid outlet of the piping outlet and the circulation pump (that is, a predetermined liquid gas layer is provided).
  • the temperature of the liquid nitrogen above the subcooled cold liquid nitrogen at each piping port increases in order toward the liquid surface, and the liquid nitrogen temperature at the liquid surface is 0.3MPa liquid gas. Boiling temperature of It is almost the same as the degree. Therefore, in the past, when the pressure in the reservoir tank was pressurized with the same kind of gas, there was a problem that the gas was liquidated and the pressure dropped due to insufficient gas supply. As a result, it was found that almost no gas was liquefied.
  • the outlet pressure of the circulation pump also increases (arrow d), and the reservoir tank can be constantly pressurized.
  • P2 point e
  • the valve attached to the pipe is closed and the gas supply to the reservoir tank is stopped.
  • the nitrogen gas in the gas phase is cooled with liquid nitrogen below the triple point of the nitrogen gas, and the nitrogen gas in the gas phase becomes liquid and becomes liquid nitrogen.
  • the pressure in the reservoir tank decreases as the gas volume decreases due to liquefaction (arrow f).
  • the lower limit set pressure (P1) is reached (point g)
  • the valve is opened, and nitrogen gas is again supplied to the interior of the reservoir tank by the pressure at the circulation pump outlet, increasing the pressure in the reservoir tank.
  • the piping and valves may be frozen.
  • liquid nitrogen is gasified to raise the temperature to room temperature in order to prevent it.
  • the role of the nozzle is simply to keep pumping the gas through the branched pipe, and the reservoir tank pressure will continue to rise, possibly exceeding the design pressure of the reservoir tank. When the pressure exceeds the specified pressure, it closes and pressurization with gas stops, and when the pressure falls below the specified pressure, it opens.
  • FIG. 2 is a diagram showing one embodiment of a cooling system for a superconducting power device according to the present invention.
  • Liquid nitrogen is used as the liquid gas.
  • Liquid nitrogen is stored in reservoir tank 1.
  • Reservoir tank 1 has a double container structure. Between the double containers, insulation is installed so as to surround the inner container lb, and it is maintained in a vacuum state to reduce heat intrusion. Yes.
  • the reservoir tank is a sealed container, which can be made by pressurizing the inside.
  • the circulation pump 5 is a vortex-type rotary pump.
  • the motor 5a for rotating the fin 5c and the fin are connected by a long shaft 5b of about 50 cm in order to suppress heat inflow due to conduction!
  • the fin itself is arranged in the inside 5e of the vacuum vessel so as to suppress heat intrusion from the outside.
  • the rotary pump of the present invention can flow a flow rate of 30 L / min as the flow rate of liquid nitrogen at a rotation speed of 50 Hz, and obtain a discharge pressure of 0.2 MPa as a pressure difference between the inlet and the outlet. Can do. From the pump outlet, a pipe 6 with a diameter of 3 cm leads to the heat exchange 7 of the freezer.
  • the refrigerator 8 is powered by a GM refrigerator, a Stirling refrigerator, etc., and a heat exchanger is connected to a low-temperature head for generating cold, and the circulating liquid nitrogen is cooled to a low temperature.
  • a Stirling refrigerator having an refrigeration capacity of 1 kW is used.
  • a heat exchanger ⁇ cooled by a 30 L / min liquid nitrogen power refrigerator, the one that was 77 K at the inlet is used.
  • the liquid nitrogen cooled by the refrigerator is connected to the superconducting power equipment inlet 10 through a pipe 9 having a diameter of 3 cm. It is connected to water tightly.
  • the superconducting cable is cooled by circulating the liquid nitrogen cooled by the refrigerator in the superconducting cable.
  • the temperature of liquid nitrogen that has cooled the superconducting cable rises, but since the increased temperature is below the boiling point, a subcooled state in which no bubbles are generated in the liquid nitrogen is maintained. For this reason, even with a 500 m superconducting cable, the pressure loss is less than O.lMPa, and it is sufficiently small and allows liquid nitrogen to flow stably.
  • liquid nitrogen permeates into the electric insulation layer of the superconducting cable without causing bubbles, the electric insulation can be maintained.
  • Liquid nitrogen that has exited the outlet 12 of the superconducting cable returns to the reservoir tank 1 through the pipe 13 to form a circulation loop.
  • the reservoir tank 1, the circulation pump 2, the heat exchange 3 of the refrigerator, the superconducting cable 4, and the nitrogen piping connecting these devices are all double containers that use vacuum insulation to reduce the intrusion heat from external forces. It has a structure.
  • the pipe 13 returned to the reservoir tank is a pipe 14 that reaches from the top to the bottom of the reservoir tank, and returns the liquid to the reservoir tank from the outlet 15 to the bottom of the reservoir tank.
  • the liquid connected to the circulation pump Inlet 3 is also located at the bottom of the reservoir tank. During the circulation, the liquid nitrogen in the reservoir tank is stored so that it is at least 20 cm higher than the outlet 15 position and the liquid level 2 is at the position.
  • a stainless steel pipe 16 having a diameter of 6 mm is branched and taken out from the pipe 6 at the pump outlet.
  • the liquid nitrogen passing through the inside of the pipe 16 exits from the vacuum vessel of the circulation pump, and then passes through the vaporizer 17 where everything is changed from liquid nitrogen to room temperature nitrogen gas.
  • a copper hot water container with a copper 6mm piping force wound in a 6m coil shape is used, and the liquid nitrogen inside is heated by being immersed in the hot water. ing.
  • a heater is wound around the outside of the coil and the temperature is increased by heating the heater by energization, or fins are attached to the piping to exchange heat with the atmosphere. It is sufficient if the liquid nitrogen inside can be turned into room temperature gas, such as a heating method.
  • the pipe 18 exiting the vaporizer 17 is filled with gas when the outlet pressure falls below a predetermined pressure.
  • a nozzle 19 is installed that has a pressure control function that stops the gas when the pressure exceeds the specified pressure.
  • the pipe 20 exiting the valve 19 is attached to the upper part of the reservoir tank so that the reservoir tank can be pressurized.
  • the pipes 18 and 20 after passing through the vaporizer 17 are at room temperature, so there is no need for a heat insulation structure.
  • the circulation pump outlet force and the pipe 16 up to the vaporizer are made of a heat insulating material such as urethane foam. It is more aesthetically preferable that the pipe 16 is not frosted.
  • the valve 19 is operated at a low temperature, the position of the valve 19 and the vaporizer 17 can be reversed. The low temperature valve is more expensive than the normal temperature, and economically. It is not an appropriate arrangement.
  • the pressure extraction pipe 16 was taken out from the pump outlet pipe 6.
  • the pressure in the reservoir tank could be from the refrigerant heat exchanger outlet pipe 9 or the superconducting equipment inlet 10. As long as it is higher, the object of the present invention can be achieved no matter where it is taken out. In this sense, the pump outlet is not simply indicated as the immediate vicinity of the pump outlet, but all downstream from the pump outlet is collectively referred to. Yes.
  • FIG. 3 is a diagram showing one part of another embodiment of the cooling system for a superconducting power device according to the present invention. That is, FIG. 3 shows an extraction diagram of the reservoir tank portion in order to explain the present embodiment in the cooling system.
  • the circulation pump 5 the fin portion 5c for sending the liquid is in the liquid in the reservoir tank, and the rotation of the motor 5a is transmitted by the long shaft 5b.
  • Liquid nitrogen is pumped out of the reservoir tank, passes through pipe 6, exits the reservoir tank, and cools the liquid nitrogen.
  • the piping for pressurization is attached to the portion of the piping 6 coming out from the reservoir tank, and then returns to the reservoir tank through the same vaporizer 17 and valve 19 as in the first embodiment.
  • Example 1 the pressurizing means of the reservoir tank is only by gas from the pump outlet.
  • the pipe is as thin as 6 mm and the pressure is divided by the pump discharge pressure. For this reason, it takes a very long time to reach a predetermined pressure with less gas supply. Especially when the reservoir tank is large, it takes tens of hours. Therefore, as shown in FIG. 4, as a supplementary means, an external pipe 21 is attached to the reservoir tank to supply gas to the high-pressure nitrogen cylinder 22 or nitrogen curdka. Further, when the gas phase portion inside the reservoir tank is cooled to a low temperature, the liquid is promoted. Therefore, the heater 23 may be disposed in the gas phase to suppress the liquid.
  • the boiling point is lower than that of the liquid gas used for pressurization, and the gas dissolves in the liquid gas, causing instability in the circulation of the liquefied gas and troubles related to insulation of the electrical equipment.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

Le système de refroidissement pour un appareil électrique supraconducteur de l’invention a un réservoir pour stocker du gaz liquide, une pompe de circulation, un échangeur de chaleur pour refroidir le gaz liquide, et une boucle de circulation dans laquelle circule le gaz liquéfié, le gaz liquéfié circulant à l’état sous-refroidi en utilisant la pompe de circulation pour refroidir l’appareil électrique supraconducteur, ledit système de refroidissement comprend en outre un moyen de pressurisation pour pressuriser le réservoir avec le même type de gaz que le gaz liquéfié, et le niveau liquide du réservoir pour stocker le gaz liquéfié dans un état pressurisé est placé au-dessus de la sortie d'une ligne de retour du gaz liquéfié circulant à une distance au moins égale à la somme de la profondeur de dissolution du gaz de pressurisation et du coefficient de correction du mouvement du niveau liquide.
PCT/JP2005/010936 2004-06-28 2005-06-15 Système de refroidissement pour appareil électrique supraconducteur WO2006001203A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US11/630,889 US20080202127A1 (en) 2004-06-28 2005-06-15 Cooling System for Superconducting Power Apparatus
EP05751512A EP1780482A4 (fr) 2004-06-28 2005-06-15 Système de refroidissement pour appareil électrique supraconducteur
CN2005800196798A CN1969158B (zh) 2004-06-28 2005-06-15 超导电力设备用冷却系统
KR1020067019841A KR101142901B1 (ko) 2004-06-28 2005-06-15 초전도 전력기기용 냉각 시스템

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-189117 2004-06-28
JP2004189117A JP4728601B2 (ja) 2004-06-28 2004-06-28 超電導電力機器用冷却システム

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WO2006001203A1 true WO2006001203A1 (fr) 2006-01-05

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US (1) US20080202127A1 (fr)
EP (1) EP1780482A4 (fr)
JP (1) JP4728601B2 (fr)
KR (1) KR101142901B1 (fr)
CN (1) CN1969158B (fr)
WO (1) WO2006001203A1 (fr)

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JP2008053215A (ja) * 2006-07-24 2008-03-06 Furukawa Electric Co Ltd:The 超電導線材、超電導導体および超電導ケーブル
WO2008015941A1 (fr) * 2006-08-02 2008-02-07 The Furukawa Electric Co., Ltd. Fil supraconducteur composite, procédé de fabrication associé, et câble supraconducteur
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US20080202127A1 (en) 2008-08-28
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CN1969158A (zh) 2007-05-23
EP1780482A4 (fr) 2010-04-21
KR101142901B1 (ko) 2012-05-10
JP2006012654A (ja) 2006-01-12
EP1780482A1 (fr) 2007-05-02
CN1969158B (zh) 2010-12-22

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