EP2657630A2 - Procédé et dispositif de fabrication de produits refroidis - Google Patents

Procédé et dispositif de fabrication de produits refroidis Download PDF

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Publication number
EP2657630A2
EP2657630A2 EP13163580.7A EP13163580A EP2657630A2 EP 2657630 A2 EP2657630 A2 EP 2657630A2 EP 13163580 A EP13163580 A EP 13163580A EP 2657630 A2 EP2657630 A2 EP 2657630A2
Authority
EP
European Patent Office
Prior art keywords
pressure
nitrogen
pressure vessel
product
cooled
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.)
Withdrawn
Application number
EP13163580.7A
Other languages
German (de)
English (en)
Other versions
EP2657630A3 (fr
Inventor
Emir Tebib
Frank Gockel
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 Group GmbH
Messer France SAS
Original Assignee
Messer Group GmbH
Messer France SAS
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 Group GmbH, Messer France SAS filed Critical Messer Group GmbH
Publication of EP2657630A2 publication Critical patent/EP2657630A2/fr
Publication of EP2657630A3 publication Critical patent/EP2657630A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F25D3/12—Devices using other cold materials; Devices using cold-storage bodies using solidified gases, e.g. carbon-dioxide snow

Definitions

  • the invention relates to a method for producing cooled products, in which a product to be cooled is brought into direct thermal contact with a cryogenic cooling medium, mixed with this and then the cooling medium is separated from the cooled product.
  • the invention further relates to a corresponding device.
  • the cooling medium is a cryogenic cooling medium is used, ie a cooling medium whose temperature is well below 0 ° C, such as carbon dioxide snow or a cryogenic liquefied gas, such as liquid nitrogen, liquid oxygen or liquefied natural gas.
  • a system for dosing a liquid cryogenic medium in which the liquid cooling medium is introduced by means of injection nozzles into a container containing the product, for example a mixer for cooling food products.
  • Cooling with liquid carbon dioxide which is introduced under pressure and partly passes into carbon dioxide snow during expansion with strong cooling, makes possible a very effective solid-solid transfer of the heat from the product to the cooling medium, with the carbon dioxide snow sublimating without residue.
  • the cooling rate or the heat flow of the carbon dioxide snow due to the temperature of about minus 78.9 ° C is limited.
  • liquid nitrogen has a temperature of minus 196 ° C .
  • the problem with the use of liquid cryogenic cooling media is often insufficient heat transfer between the product and the cooling medium due to the Leidenfrost effect.
  • a suspension of liquid nitrogen and dry ice particles was in the EP 1 887 296 A2 as well as the US 2010/00474224 A1 proposed to use as a cooling medium, a suspension of liquid nitrogen and dry ice particles.
  • heat is transferred from the product to theniceisteilchen, which were brought in the suspension to the low temperature of the nitrogen.
  • the transport of liquid carbon dioxide usually takes place at ambient temperature under high pressure, while liquid nitrogen requires a well insulated transport line.
  • the invention is therefore based on the object to provide a method and an apparatus for producing cooled products, in which or in which the problems that occur in liquid cryogenic cooling media are overcome and at the same time the efficiency of the cooling compared to those from the state the technique known to the art is improved.
  • a product to be cooled is brought into direct thermal contact with deep-frozen solid nitrogen for cooling and mixed with it.
  • the nitrogen used as cooling medium melts or sublimes at least partially, the liquid nitrogen formed during the melting of the solid nitrogen evaporates at least partially and thus contributes to the cooling of the product during the further course of the cooling procedure.
  • cryogenic solid nitrogen here nitrogen is understood to have a temperature below its melting point.
  • the melting point of solid nitrogen is at the triple point at a pressure of 125 mbar at about -210 ° C (63 K). The melting point is shifted to lower temperatures at lower pressure.
  • Solid nitrogen is already known in connection with the cooling of superconducting equipment.
  • another method of cooling a superconducting system is known in which the superconducting system is in thermal contact via a solid nitrogen heat exchanger.
  • solid nitrogen for producing refrigerated products, in particular for the production of refrigerated foods or pharmaceuticals, has not yet been described.
  • the products can be brought by the inventive method quickly and easily during the cooling process to a temperature of preferably between -30 ° C and minus 15 ° C and then stored at this temperature (frozen products).
  • the inventive use of solid nitrogen as a cooling medium also allows the cooling of products to even lower temperatures, for example temperatures between minus 200 ° C and minus 100 ° C, which can not be achieved by other cooling media or only with great effort.
  • the use of solid nitrogen has some advantages over other cooling media.
  • the amount of solid nitrogen is preferably chosen such that the nitrogen melted during the cooling process at least largely evaporates in the further course of the cooling task, whereby additionally the heat of vaporization of the nitrogen is used for cooling the product.
  • the inventive method is particularly suitable for producing cooled solid, liquid, powdery, granular or pasty products, in particular food, such as ice cream, or of biochemical, medical or pharmaceutical products, such as blood plasma, cell cultures, pharmaceutical agents, etc.
  • the solid nitrogen is produced from liquid nitrogen by adiabatic lowering of the pressure or the nitrogen partial pressure in a gas phase present above the liquid nitrogen. This is achieved, for example, by bringing the interior of a thermally insulated pressure vessel in which liquid nitrogen initially at ambient pressure (about 1 bar) is evacuated by means of a vacuum pump to a pressure below the triple point pressure (125 mbar) of nitrogen.
  • the solidification can also take place in that the nitrogen partial pressure in the gas phase above the liquid nitrogen is brought to a corresponding value below the triple point pressure of nitrogen by addition of a further gas which does not freeze out at low temperatures, such as hydrogen or helium.
  • the pressure in the pressure vessel or the nitrogen partial pressure in the gas phase above the liquid nitrogen is preferably brought to a value between 1 mbar and 125 mbar, more preferably to a value between 10 mbar and 30 mbar.
  • liquid nitrogen is supplied to the pressure vessel.
  • solid nitrogen is obtained.
  • the product to be cooled is fed to the pressure vessel via a pressure lock and brought into thermal contact with the solid nitrogen.
  • the product to be cooled is first supplied to the pressure vessel and then the pressure in the pressure vessel is lowered to a value below the triple point of nitrogen. Subsequently, liquid nitrogen is supplied to the pressure vessel via a pressure lock or an injector, wherein the pressure in the pressure vessel continues to remain at a value below the triple point or is lowered further. The supplied liquid nitrogen solidifies at least partially due to the low pressure. Subsequently, the solid nitrogen thus produced is brought into thermal contact with the product already in the pressure vessel.
  • the pressure in the pressure vessel is increased by supplying air, nitrogen or another inert gas, such as argon or another noble gas, to ambient pressure in all the aforementioned variants.
  • the cooled by the cooling process to its target temperature product is removed from the pressure vessel.
  • the cooling of the product is preferably carried out to a target temperature between minus 100 ° C and minus 10 ° C, preferably between minus 30 ° C and minus 18 ° C, however, extreme product temperatures below -200 ° C can be achieved with this method.
  • the object of the invention is also achieved with a device for producing refrigerated products having the features of patent claim 9.
  • the device according to the invention is therefore equipped with a pressure vessel and a mixing device integrated in the pressure vessel, which pressure vessel has a feed for a product to be cooled and a liquid nitrogen feed line connected to a liquid nitrogen tank, the pressure vessel and / or the mixing device having a thermal insulation is equipped, and to the pressure vessel, a vacuum pump is connected.
  • the pressure in the pressure vessel is reduced to pressures below the triple point of nitrogen by means of the vacuum pump.
  • nitrogen present in the pressure vessel and / or supplied via the feed line is at least partially solidified.
  • Product which is present for example in the liquid, pasty or powdery state or in the form of pellets in the pressure vessel or during or after the pressure drop is fed to the pressure vessel via the (in this case configured as a pressure lock) product supply comes in the pressure vessel with the solidified nitrogen in thermal Contact and is cooled by this.
  • the mixing device is an intimate mixing of product and solid nitrogen.
  • the cooled product can be removed again via the product feed, which is, for example, an opening in the pressure vessel, which can be closed pressure-tight with a lid or pressure lock.
  • a product removal device different from the product supply is provided.
  • the latter case of separate devices, in particular pressure locks, for product supply and removal enables in particular a continuous operation of the device according to the invention.
  • the mixing device integrated in the pressure vessel comprises, for example, a mixer, a grinder, an agitator, a kneader, a rotatable mixing drum or a combination of a plurality of such devices.
  • FIG. 1 schematically shows a device according to the invention.
  • the device 1 for cooling products shown in the drawing comprises a thermally insulated pressure vessel 2 with a product feed 3, a liquid nitrogen feed 4, a suction line 5 and a chilled product discharge opening 6.
  • the product feed 3 and the removal opening 6 are in each case an opening in the pressure vessel 2, which is suitable for feeding the product to be cooled in the solid, liquid, pasty, powdery or granulated state or the cooled product in the solid, pasty, powdered or granulated state, and can be closed pressure-tight with a lid.
  • the product is, for example, a food, for example Eiskremmasse which is to be completely frozen by the cold treatment in the pressure vessel 2 to a temperature of for example below -18 ° C.
  • the feeder 3 is connected to a tank 7 for liquid nitrogen, which is, for example, a dewar or a stand tank.
  • a vacuum pump 8 is provided, by means of which the pressure in the pressure vessel 2 can be brought to a value below the pressure at the triple point of nitrogen (about 125 mbar).
  • the pressure in the interior of the pressure vessel 2 can be lowered to a value between 10 mbar and 50 mbar.
  • the device 1 is equipped with a mixing device 9 for mixing substances present in the pressure vessel 2, which can be actuated via a vacuum feedthrough by means of a motor 10 arranged outside the pressure vessel 2.
  • the product to be cooled is first introduced via supply 3 and liquid nitrogen via line 4 into the pressure vessel 2.
  • the pressure vessel 2 initially prevails a pressure corresponding to the ambient pressure (1 bar).
  • a lid 11 arranged in the feed line 3 and a valve 12 arranged in the feed 4 are produced closed.
  • the vacuum pump 8 the pressure in the pressure vessel 2 is lowered to a value below the triple point pressure of nitrogen.
  • the nitrogen can also be introduced first, the pressure lowered and the product subsequently supplied, or the product first fed, the pressure lowered, and then the liquid nitrogen introduced via a pressure lock or an injector (also not shown here) ,
  • a pressure lock is used; in the latter alternative, instead of the valve 12, a pressure lock or an injector is used.
  • the nitrogen present in the pressure vessel 2 at least partially changes to the solid state.
  • the mixing device 9 product and solid nitrogen in the pressure vessel 2 are intimately mixed. Due to the presence of both substances in the solid or pasty state, a good heat transfer takes place.
  • the pressure in the pressure vessel 2 is continuously monitored during the treatment and held by the vacuum pump at a predetermined working pressure of, for example, between 10 mbar and 50 mbar.
  • the pressure in the pressure vessel 2 is readjusted to ambient pressure by supplying air or an inert gas such as nitrogen or argon.
  • the nitrogen used as cooling medium evaporates or sublimates and separates in this way from the product to be cooled.
  • the pressure in the pressure vessel 2 may also remain at the low feed pressure and the product is withdrawn via a pressure lock (installed in this case instead of the lid 13).
  • the product feed and the discharge opening may also be identical, i. The product is introduced via the same opening or pressure lock into the pressure vessel, over which it is also removed.
  • both the product feed 3 and the removal opening 6 are each with Pressure locks equipped to allow a supply of product to be cooled via the feed 6 and a removal of cooled product from the pressure vessel 2, without requiring the pressure in the pressure vessel 2 must be brought to ambient pressure.
  • liquid nitrogen is continuously supplied via the feed 4 during the treatment and the pressure in the pressure vessel is kept at its working pressure of approximately 20 mbar to 50 mbar.

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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)
EP13163580.7A 2012-04-27 2013-04-12 Procédé et dispositif de fabrication de produits refroidis Withdrawn EP2657630A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012008591A DE102012008591A1 (de) 2012-04-27 2012-04-27 Verfahren und Vorrichtung zum Herstellen gekühlter Produkte

Publications (2)

Publication Number Publication Date
EP2657630A2 true EP2657630A2 (fr) 2013-10-30
EP2657630A3 EP2657630A3 (fr) 2017-12-27

Family

ID=48095692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13163580.7A Withdrawn EP2657630A3 (fr) 2012-04-27 2013-04-12 Procédé et dispositif de fabrication de produits refroidis

Country Status (2)

Country Link
EP (1) EP2657630A3 (fr)
DE (1) DE102012008591A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113834234A (zh) * 2021-09-30 2021-12-24 东方电气集团科学技术研究院有限公司 一种基于固氮冷却介质制备的低温装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1604950A1 (fr) 2003-03-11 2005-12-14 Mayekawa Mfg. Co., Ltd. Procede de production d'azote pateux et appareil permettant de mettre en oeuvre ledit procede
EP1867902A2 (fr) 2006-06-14 2007-12-19 Messer France S.A.S. Dispositif destiné au dosage d'un milieu cryogène
EP1887296A2 (fr) 2006-08-08 2008-02-13 Linde Aktiengesellschaft Dispositif et procédé destiné à l'introduction d'un mélange à partir de cryogènes et de milieux cryogènes ou non cryogènes dans un congélateur ou un réfrigérateur
GB2460016A (en) 2008-04-30 2009-11-18 Siemens Magnet Technology Ltd Cooling apparatus comprising a solid coolant
US20100047424A1 (en) 2006-05-18 2010-02-25 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Use of a Mixture of Carbon Dioxide Snow and Liquid Nitrogen in Quick Freezing Applications

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5154062A (en) * 1991-07-19 1992-10-13 Air Products And Chemicals, Inc. Continuous process for producing slush hydrogen
US5603567A (en) * 1995-02-17 1997-02-18 Blentech Corporation Coaxial cryogenic injection system
US6079215A (en) * 1998-01-06 2000-06-27 Integrated Biosystems, Inc. Method for freeze granulation
JP4354460B2 (ja) * 2004-02-06 2009-10-28 株式会社前川製作所 スラッシュ窒素の製造方法及びその製造装置
EP1876404A4 (fr) * 2005-04-25 2012-08-01 Maekawa Seisakusho Kk Procédé de fabrication de liquide pâteux et appareil idoine
DE102010017928A1 (de) * 2010-04-22 2011-10-27 Linde Aktiengesellschaft Verfahren zur Herstellung von Speiseeis

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1604950A1 (fr) 2003-03-11 2005-12-14 Mayekawa Mfg. Co., Ltd. Procede de production d'azote pateux et appareil permettant de mettre en oeuvre ledit procede
US20100047424A1 (en) 2006-05-18 2010-02-25 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Use of a Mixture of Carbon Dioxide Snow and Liquid Nitrogen in Quick Freezing Applications
EP1867902A2 (fr) 2006-06-14 2007-12-19 Messer France S.A.S. Dispositif destiné au dosage d'un milieu cryogène
EP1887296A2 (fr) 2006-08-08 2008-02-13 Linde Aktiengesellschaft Dispositif et procédé destiné à l'introduction d'un mélange à partir de cryogènes et de milieux cryogènes ou non cryogènes dans un congélateur ou un réfrigérateur
GB2460016A (en) 2008-04-30 2009-11-18 Siemens Magnet Technology Ltd Cooling apparatus comprising a solid coolant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113834234A (zh) * 2021-09-30 2021-12-24 东方电气集团科学技术研究院有限公司 一种基于固氮冷却介质制备的低温装置

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Publication number Publication date
DE102012008591A1 (de) 2013-10-31
EP2657630A3 (fr) 2017-12-27

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