EP0849550A1 - Système de réfrigération à gaz liquifié pour le refroidissement à basse température d'une charge - Google Patents

Système de réfrigération à gaz liquifié pour le refroidissement à basse température d'une charge Download PDF

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Publication number
EP0849550A1
EP0849550A1 EP97111987A EP97111987A EP0849550A1 EP 0849550 A1 EP0849550 A1 EP 0849550A1 EP 97111987 A EP97111987 A EP 97111987A EP 97111987 A EP97111987 A EP 97111987A EP 0849550 A1 EP0849550 A1 EP 0849550A1
Authority
EP
European Patent Office
Prior art keywords
liquid gas
heat exchanger
cooling
liquid
cooling system
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP97111987A
Other languages
German (de)
English (en)
Other versions
EP0849550B1 (fr
Inventor
Werner Konrad Diehl
Bernd Gottschlich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Publication of EP0849550A1 publication Critical patent/EP0849550A1/fr
Application granted granted Critical
Publication of EP0849550B1 publication Critical patent/EP0849550B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/001—Arrangement or mounting of control or safety devices for cryogenic fluid systems
    • 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

Definitions

  • the invention relates to a liquid gas cooling system for cooling a Consumer at low temperature with a cooling tank for Picking up a first cryogenic liquid gas and one Heat exchanger circuit through the cooling tank and to the Consumer and is also a cryogenic liquid gas flows, and a method of cooling a consumer Low temperature.
  • liquid gas cooling systems of this type for example Cooling of monochrome motors known in which liquid nitrogen Ambient pressure is filled into an insulated cooling container, around the second liquid gas circulating in the heat exchanger circuit, also to cool liquid nitrogen or another suitable gas.
  • the heat exchanger circuit has one Subcooling heat exchanger in the liquid gas bath in the Cooling container is arranged, and on the other hand, a usual Heat exchanger, which is connected to the consumer in a heat-conducting manner, to cool it.
  • the invention solves this problem with a liquid gas cooling system with the features of claim 1 or by a method for Cooling a consumer to low temperature with the characteristics of Claim 12.
  • the liquid gas system according to the invention for cooling a Item or consumer at low temperature includes one Cooling container for receiving a first cryogenic liquid gas, a heat exchanger circuit that passes through the cooling tank and is led to the consumer and in which a second cryogenic Liquefied gas flows, and a vacuum pump for pumping out the Gas phase above the first liquefied petroleum gas from the cooling tank lower the internal pressure in the cooling tank below ambient pressure or hold.
  • the liquid gas in the cooling tank always strives for its Equilibrium state (boiling point) at which pressure and temperature have a fixed relationship.
  • the internal pressure in the cooling container thus arises accordingly lower boiling temperature; for example when using Liquid nitrogen results from lowering the internal pressure to approximately 0.14 to 1 bar a boiling point of the liquid gas bath of about 64 K to 77 K (liquid nitrogen changes to the solid phase at 63 K).
  • a liquid gas cooling system is for continuous use expedient, which cools the liquid gas and constantly pumped in circulation.
  • one Pressure control device provided to the pressure in the Set the heat exchanger circuit above ambient pressure.
  • the liquid gas system according to the invention has a preferred Embodiment a supercooling heat exchanger device, which is arranged in the liquid gas bath to the in Heat exchanger circuit, preferably under positive pressure, circulating second liquid gas to cool below its boiling temperature hold. Furthermore, the heat exchanger circuit has an outside of the Cooling container lying heat exchanger device, which with the object to be cooled or consumer thermally connected is.
  • the cables When cooling one or more HTSL cables as consumers can it should be expedient to put this directly into the second liquid gas to introduce leading pipe system, the cables then from the supercooled liquefied petroleum gas.
  • the Vacuum pump preferably pressure controlled to maintain a constant Set the boiling pressure of the liquid gas in the cooling tank.
  • a automatic level control provided.
  • the heat exchanger circuit preferably contains one Circulation pump, the performance of which is designed to be a uninterrupted flow of the second liquid gas with a Speed generated at which the return temperature of the Liquefied gas despite the heat input by the consumer under the Boiling temperature in the heat exchanger circuit.
  • the invention is relatively simple, without major a low-temperature cooling system created with which, for example, when using Liquid nitrogen as liquid gas temperatures from below 77 K up to 64 K can be achieved by using the liquid gas bath temperature Pumping off the nitrogen gas phase using a vacuum pump is lowered.
  • the liquid gas in the heat exchanger circuit which can also be liquid nitrogen, is preferably with a pumped static pressure that is above ambient pressure to ensure that only pure gas-free liquid nitrogen is in the circuit is pumped, which is always in the supercooled state.
  • This supercooled liquid nitrogen can be used, for example, to cool High temperature superconductor cables are used to the to achieve and maintain superconductive state.
  • a cooling container 10 is shown, which is surrounded by a vacuum insulation jacket 12 and is closed gas-tight with a cover 14.
  • the cooling container 10 contains a liquid gas bath 16.
  • the following description relates to the use of liquid nitrogen (LN 2 ) as the liquid gas both for the liquid gas bath 16 in the cooling container 10 and for the heat exchanger circuit, which is generally designated 18.
  • the cooling principle according to the invention can also be transferred to other cryogenic liquefied gases, for example argon (Ar), neon (Ne), hydrogen (H 2 ), helium (He) or oxygen (O 2 ).
  • These liquid gases can be used in a suitable combination for the liquid gas bath 16 in the cooling container and as heat exchanger gas in the heat exchanger circuit 18.
  • Extraction line 20 for the nitrogen gas phase 22 On the cover 14 of the cooling container 10 is one Extraction line 20 for the nitrogen gas phase 22 attached.
  • a vacuum pump 24 with a vacuum pressure control device 26 provided.
  • the embodiment is in the extraction line 20 in front of the vacuum pump 24 a gas heater 28 is arranged.
  • the heat exchanger circuit 18 comprises a piping system 30 which from a supercooling heat exchanger 32, which in the Liquid gas bath 16 is arranged in the cooling container 10, via a Liquefied gas pump 34 leads to a consumer 36, which via a another heat exchanger 38 is thermally conductive with the liquid gas in the Pipeline 30 is connected. If the consumer is a HTSL cable or the like, this can also directly in a pipe section of the Pipe system 30 introduced and washed around by the liquid gas become, so that then a heat exchanger 38 in the classic sense is not necessary is.
  • the heat exchanger circuit 18 further comprises a circuit pressure control device 40 to one in the piping system 30 static pressure that is above the ambient pressure. Finally, the heat exchanger circuit 18 contains one Filling device 42 for filling and refilling liquid gas in the Piping system 30.
  • a Liquid gas supply device 44 for the cooling container 10 with a level measuring device 46, which the filling level of the Liquid gas bath 16 detected in the cooling container and a signal to controllable valve 48 can output to a feed line 50 for Open or close liquid nitrogen depending on the filling level.
  • the liquid gas cooling system according to the invention works as follows.
  • Cryogenic liquid nitrogen is supplied via line 50, usually at Ambient pressure and 77 K, filled in the cooling container 10 until a predetermined level is reached what the Level detection device 46 recognizes, and the valve 48 is closed.
  • the vacuum pump 24 pumps over the line 20 and the gas heater 28 part of the nitrogen gas phase 22 from the Cooling container 10 from.
  • the vacuum pump 24 is a vacuum pressure regulator 26 assigned to the by the vacuum pump 24 in Cooling container 10 generated negative pressure to a constant value, e.g. B. 0.1462 bar. It is important that the internal pressure in the Cooling container is below atmospheric pressure.
  • the function of the Gas heater 28 is about to prevent the vacuum pump set 24 is damaged by the cryogenic gas masses to be pumped out. When using, for example, a cryogenic fan as Vacuum pump, the gas heater 28 can also be omitted.
  • the vacuum pump 24 By means of the vacuum pump 24 is thus by pumping the Nitrogen gas phase, the boiling pressure of the nitrogen is lowered, so that the nitrogen bath 16 below its ambient pressure Boiling temperature, ie below 77 K, cools down; at a pressure of about 0.14 bar results in a boiling bath temperature of about 64 K.
  • About the Vacuum pressure regulator 26 of the vacuum pump 24 can have the boiling pressure and thus the boiling point of the liquid nitrogen to a desired one Value can be set.
  • the automatic Level control 24 used in order to evaporation and Pumping down liquid nitrogen from a (not shown) to replenish the storage tank.
  • the Subcooling heat exchanger 32 In the liquid gas bath 16 is the Subcooling heat exchanger 32, by means of which Circulation pump 34 is also pumped liquid nitrogen.
  • the Pressure control device 40 generates a static pressure of more than 1 bar in the heat exchanger circuit 18 to ensure da ⁇ is the boiling point of that in the heat exchanger circuit Liquid nitrogen significantly above that of the nitrogen bath 16 in Cooling container 10 is located, so that only pure gas-free in the circuit Liquid nitrogen is pumped around, which is always in the supercooled Condition.
  • the supercooling heat exchanger 32 is like this dimensioned that the nitrogen temperature in the pipeline 30 only is slightly above the nitrogen bath temperature, d. H. that the Liquid nitrogen in the heat exchanger circuit 18 when passing through the Supercooling heat exchanger 33 essentially the temperature of the Nitrogen bath 16 adopts.
  • the delivery rate of the circulation pump 34 is designed so that the return temperature in the pipe 30 despite of the heat input by the consumer 36 under the Boiling temperature of the liquid nitrogen in the circuit 18 is.
  • the consumer 36 can use a heat exchanger 38 be thermally connected to the heat exchanger circuit 18; he can also directly into a section of the piping system 30 be introduced.
  • the vacuum pump is in operation of the invention LPG cooling system not only able to use the nitrogen bath 16 by pumping the gas phase 22 to a temperature below 77 K. cool, but it keeps the liquid gas bath 16 during the total operation of the cooling system on a predetermined Temperature by the pressure in the cooling container 10 on a specified value, under ambient pressure (1 bar). Pumps for this the vacuum pump 24 which due to the heat input by the Supercooling heat exchanger 32 evaporating amount of nitrogen; at the refilling of liquid nitrogen to maintain a constant Vacuum pump 24 pumps levels of the liquid gas bath 16 additionally generated gas masses and relaxes the internal pressure in the cooling container 10 to the predetermined value in order to Cool the liquid gas bath 16 back to the predetermined temperature.
  • the entire liquid gas cooling system can be transported in one Gesture can be integrated to make it manageable and universal to make it usable.
  • the LPG circulation pump 34, the Liquid gas filling device 32 and the circuit pressure control device 40 can be integrated in the supercooling heat exchanger 32 in order to to make the overall system more compact.
  • cooling system according to the invention in automatic operation it is advisable to run pressure monitoring, Level and temperature measuring points with alarm signal outputs and suitable displays at different points in the overall system to provide.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
EP97111987A 1996-12-18 1997-07-15 Procédé pour le refroidissement à basse température d'une charge et système de réfrigération à gaz liquifié pour la mise en oeuvre du procédé Expired - Lifetime EP0849550B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19652764 1996-12-18
DE19652764A DE19652764A1 (de) 1996-12-18 1996-12-18 Flüssiggas-Kühlungssystem zur Kühlung eines Verbrauchers auf Tieftemperatur

Publications (2)

Publication Number Publication Date
EP0849550A1 true EP0849550A1 (fr) 1998-06-24
EP0849550B1 EP0849550B1 (fr) 2003-08-20

Family

ID=7815195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97111987A Expired - Lifetime EP0849550B1 (fr) 1996-12-18 1997-07-15 Procédé pour le refroidissement à basse température d'une charge et système de réfrigération à gaz liquifié pour la mise en oeuvre du procédé

Country Status (2)

Country Link
EP (1) EP0849550B1 (fr)
DE (2) DE19652764A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7453041B2 (en) 2005-06-16 2008-11-18 American Superconductor Corporation Method and apparatus for cooling a superconducting cable
CN110332762A (zh) * 2019-08-08 2019-10-15 兰州真空设备有限责任公司 气氮循环调温方法及***
CN114111082A (zh) * 2021-11-02 2022-03-01 深圳供电局有限公司 一种基于gm制冷机的过冷液氮循环***

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850911C2 (de) * 1998-11-05 2000-12-07 Messer Griesheim Gmbh Flüssiggas-Kühlungssystem zur Kühlung eines Verbrauchers auf Tieftemperatur
DE102017216015A1 (de) 2017-09-12 2019-03-14 Robert Bosch Gmbh Handwerkzeugmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH444894A (de) * 1965-01-22 1967-10-15 Max Planck Gesellschaft Vorrichtung zur Kühlung von Supraleitungsspulen und Verfahren zum Betrieb der Vorrichtung
US3696636A (en) * 1968-03-06 1972-10-10 Gaston M Mille Method and apparatus for cooling liquids
DE2423681B1 (de) * 1974-05-15 1975-09-25 Messer Griesheim Gmbh, 6000 Frankfurt Verfahren zum Tiefkühlen von Objekten mittels eines tiefsiedenden Gases
DE2929709A1 (de) * 1979-07-21 1981-02-12 Messer Griesheim Gmbh Vorrichtung zum unterkuehlen von unter druck stehenden, tiefsiedenden verfluessigten gasen
US4541248A (en) * 1983-12-15 1985-09-17 Chicago Bridge & Iron Company Constant temperature refrigeration system for a freeze heat exchanger
EP0427112A1 (fr) * 1989-11-06 1991-05-15 Westfalen Ag Procédé et dispositif de production de la phase gazeuse d'un volume de liquide stocké dans la phase liquide

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6700374A (fr) * 1967-01-11 1968-07-12

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH444894A (de) * 1965-01-22 1967-10-15 Max Planck Gesellschaft Vorrichtung zur Kühlung von Supraleitungsspulen und Verfahren zum Betrieb der Vorrichtung
US3696636A (en) * 1968-03-06 1972-10-10 Gaston M Mille Method and apparatus for cooling liquids
DE2423681B1 (de) * 1974-05-15 1975-09-25 Messer Griesheim Gmbh, 6000 Frankfurt Verfahren zum Tiefkühlen von Objekten mittels eines tiefsiedenden Gases
DE2929709A1 (de) * 1979-07-21 1981-02-12 Messer Griesheim Gmbh Vorrichtung zum unterkuehlen von unter druck stehenden, tiefsiedenden verfluessigten gasen
US4541248A (en) * 1983-12-15 1985-09-17 Chicago Bridge & Iron Company Constant temperature refrigeration system for a freeze heat exchanger
EP0427112A1 (fr) * 1989-11-06 1991-05-15 Westfalen Ag Procédé et dispositif de production de la phase gazeuse d'un volume de liquide stocké dans la phase liquide

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7453041B2 (en) 2005-06-16 2008-11-18 American Superconductor Corporation Method and apparatus for cooling a superconducting cable
CN110332762A (zh) * 2019-08-08 2019-10-15 兰州真空设备有限责任公司 气氮循环调温方法及***
CN114111082A (zh) * 2021-11-02 2022-03-01 深圳供电局有限公司 一种基于gm制冷机的过冷液氮循环***

Also Published As

Publication number Publication date
EP0849550B1 (fr) 2003-08-20
DE19652764A1 (de) 1998-06-25
DE59710611D1 (de) 2003-09-25

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