WO2009125118A1 - Process for cooling products, especially food products, by immersion in a cryogenic liquid in the presence of ultrasound - Google Patents

Process for cooling products, especially food products, by immersion in a cryogenic liquid in the presence of ultrasound Download PDF

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Publication number
WO2009125118A1
WO2009125118A1 PCT/FR2009/050497 FR2009050497W WO2009125118A1 WO 2009125118 A1 WO2009125118 A1 WO 2009125118A1 FR 2009050497 W FR2009050497 W FR 2009050497W WO 2009125118 A1 WO2009125118 A1 WO 2009125118A1
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Prior art keywords
products
bath
ultrasound
immersion
cooling
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PCT/FR2009/050497
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French (fr)
Inventor
Didier Alo
Franck Cousin
Antony Dallais
Bernard Delpuech
Thierry Dubreuil
Frédérick WILLY
Giuseppe Pigorini
Robert Taylor
Original Assignee
L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude
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Application filed by L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude filed Critical L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude
Publication of WO2009125118A1 publication Critical patent/WO2009125118A1/en

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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
    • F25D3/11—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air with conveyors carrying articles to be cooled through the cooling space
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/26—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating
    • A23L3/30—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating by treatment with ultrasonic waves
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/36—Freezing; Subsequent thawing; Cooling
    • A23L3/37—Freezing; Subsequent thawing; Cooling with addition of or treatment with chemicals
    • A23L3/375—Freezing; Subsequent thawing; Cooling with addition of or treatment with chemicals with direct contact between the food and the chemical, e.g. liquid nitrogen, at cryogenic temperature
    • 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
    • F25D3/127—Stationary devices with conveyors carrying articles to be cooled through the cooling space

Definitions

  • the present invention relates to a method for cooling products, especially food products, by immersion in a liquid cryogenic fluid at atmospheric pressure in the presence of ultrasound.
  • the products are transported either by a conveyor also immersed in the bath or by mechanical vibrations applied to the trough forming the bath or by a product drive system.
  • a conveyor also immersed in the bath or by mechanical vibrations applied to the trough forming the bath or by a product drive system.
  • the present invention seeks to increase the heat exchange coefficients between products immersed in a bath consisting of a cryogenic fluid.
  • the present invention proposes the improvement of the heat transfer of equipment using a bath of cryogenic liquid by the implementation of ultrasound. Without being in any way limited by the following explanation, it may be thought that the presence of ultrasound makes it possible to partially or totally reduce the effects of the gaseous layer that develops at the cryogenic fluid / product interface, and therefore to cool the products faster and thus increase the capacity of existing equipment on the market.
  • the invention focuses in particular on the following cases:
  • the bath is a mixture of liquid nitrogen and dry ice particles
  • the bath is a mixture of liquid nitrogen and snow-water particles (H 2 O).
  • the present invention therefore proposes a process for cooling products, especially food products, by immersing the products in a bath of a cryogenic fluid, characterized in that during all or part of the immersion, the bath is subjected to ultrasound.
  • the invention proposes to add an ultrasonic generator to equipment in which a bath of a cryogenic fluid is used to cool by immersion products.
  • the immersion cooling equipment is of the type comprising a trough, a supply of cryogenic fluid, for example liquid nitrogen, and a vibrating system for transporting products within of the trough, equipment that is provided according to the present invention of transducers attached to the walls of the trough (in accordance with the single figure attached).
  • the generated ultrasound propagates in the liquid nitrogen through the walls of the vessel when the transducer system is located outside or directly transmitted when the transducers are immersed in the liquid nitrogen.
  • Such "vibrating support" type equipment is for example described in document EP-A-505 222 or else in document EP-1 613 908.
  • One of the possible modes of operation of such a vibrating support system is as follows: an amount of liquid nitrogen is injected into the tank, which is for example in a slightly rising slope configuration. The overflow of liquid comes out of the device with the products. The nitrogen is then separated from the products by a grid located at the device outlet. The nitrogen thus recovered is recycled: it is collected in a reserve and then pumped by a piston pump and goes back into the treatment tank.
  • the equipment no longer comprises recirculation of cryogenic fluid, the level of liquid nitrogen in the trough is controlled and a supplement is made continuously as and when evaporation.
  • the level of nitrogen is generally maintained substantially constant in a tank through a valve controlled by a probe that measures the level of liquid nitrogen.
  • the nitrogen circulates in semi-closed circuit, it leaves the circuit only by evaporation in contact with the products, this nitrogen outlet is permanently compensated by the supply of the reserve.
  • the products make only one passage in the tank.
  • the bath is liquid nitrogen
  • the bath is a mixture of liquid nitrogen and dry ice; - The bath is a mixture of liquid nitrogen and watery snow (H 2 O).
  • the method is implemented in "vibrating support" type immersion cooling equipment comprising a trough, a supply of cryogenic fluid, for example liquid nitrogen, and a vibrating system for transporting products within the trough, equipment that is provided according to the present invention transducers attached to the walls of the trough.
  • cryogenic fluid for example liquid nitrogen
  • a cryogenic fluid whose density is close to that of liquid nitrogen is used, which is a very advantageous point insofar as the mixture is then stable and does not require not mechanical agitation.
  • cryogenic fluids added particles dry ice, water ..
  • the solid particles having a tendency otherwise to be deposited in the bottom of the bath. This separation is due to the difference in density between the particles and the liquid nitrogen.
  • water ice at a density close enough to that of liquid nitrogen which makes the decantation is slower. It will therefore be preferable to use liquid nitrogen / water-snow mixtures since such a mixture can be kept homogeneous by low mechanical agitation, or even by ultrasound, or even simply by the agitation caused by the products to be cooled themselves.
  • the transducers generate ultrasound in a range of 20 to 40 kHz and preferably between 30 and 40 kHz.
  • the acoustic power is typically between 0.2 to 2 W / cm 2 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Nutrition Science (AREA)
  • Food Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)

Abstract

A process for cooling products, especially food products, by immersion of the products in a bath of cryogenic fluid, being characterized in that during all or part of the immersion, the bath is subjected to ultrasound.

Description

Procédé de refroidissement de produits, notamment alimentaires, par immersion dans un liquide cryogénique, en présence d'ultrasons Method for cooling products, especially food products, by immersion in a cryogenic liquid, in the presence of ultrasound
La présente invention concerne un procédé de refroidissement de produits, notamment alimentaires, par immersion dans un fluide cryogénique liquide à la pression atmosphérique en présence d'ultrasons.The present invention relates to a method for cooling products, especially food products, by immersion in a liquid cryogenic fluid at atmospheric pressure in the presence of ultrasound.
Les techniques de refroidissement de produits, en particulier alimentaires, par immersion dans un bain d'un fluide cryogénique (le plus couramment de l'azote liquide) sont bien connues, les équipements munis d'un bain sont conçus pour que les produits se refroidissent au contact du fluide qui absorbe la chaleur et s'évapore. Mais la vaporisation crée une couche gazeuse néfaste au transfert thermique ralentissant ainsi le refroidissement des produits.The cooling techniques of products, particularly food products, by immersion in a bath of a cryogenic fluid (most commonly liquid nitrogen) are well known, equipment equipped with a bath are designed for the products to cool in contact with the fluid that absorbs heat and evaporates. But the vaporization creates a gaseous layer harmful to the heat transfer thus slowing down the cooling of the products.
Les produits sont transportés soit par un convoyeur plongé également dans le bain soit par des vibrations mécaniques appliquées à l'auge formant le bain ou par un système d'entrainement des produits. On sait que les mouvements ainsi générés compensent en partie les phénomènes de caléfaction. Ces systèmes sont conçus pour le transport des produits et non pas pour l'amélioration de l'échange thermique. Ainsi on constate que les phénomènes de caléfaction provoquent toujours dans de telles solutions antérieures un ralentissement au refroidissement.The products are transported either by a conveyor also immersed in the bath or by mechanical vibrations applied to the trough forming the bath or by a product drive system. We know that the movements thus generated compensate in part for the phenomena of calefaction. These systems are designed for the transport of products and not for the improvement of heat exchange. Thus, it can be seen that the phenomena of heating up always cause in such prior solutions a slowing down on cooling.
La présente invention s'attache à augmenter les coefficients d'échange thermique entre des produits plongés dans un bain constitué d'un fluide cryogénique.The present invention seeks to increase the heat exchange coefficients between products immersed in a bath consisting of a cryogenic fluid.
Comme on le verra plus en détail dans ce qui suit, la présente invention propose l'amélioration du transfert thermique d'un équipement utilisant un bain de liquide cryogénique par la mise en œuvre d'ultrasons. Sans être en aucune façon limité par l'explication qui suit, on peut penser que la présence d'ultrasons permet de réduire de façon partielle ou totale les effets de la couche gazeuse qui se développe à l'interface fluide cryogénique /produit, et donc de refroidir plus rapidement les produits et ainsi d'augmenter la capacité des équipements existant sur le marché.As will be seen in more detail in the following, the present invention proposes the improvement of the heat transfer of equipment using a bath of cryogenic liquid by the implementation of ultrasound. Without being in any way limited by the following explanation, it may be thought that the presence of ultrasound makes it possible to partially or totally reduce the effects of the gaseous layer that develops at the cryogenic fluid / product interface, and therefore to cool the products faster and thus increase the capacity of existing equipment on the market.
Mais la Demanderesse est consciente que si ce mécanisme peut proposer une explication aux résultats observés, d'autres phénomènes peuvent également y contribuer.But the Applicant is aware that if this mechanism can provide an explanation to the observed results, other phenomena can also contribute.
L'invention s'attache en particulier aux cas suivants:The invention focuses in particular on the following cases:
- Le bain est de l'azote liquide- The bath is liquid nitrogen
- Le bain est un mélange d'azote liquide et de particules de neige carbonique ;- The bath is a mixture of liquid nitrogen and dry ice particles;
- Le bain est un mélange d'azote liquide et de particules de neige hydrique (H2O).- The bath is a mixture of liquid nitrogen and snow-water particles (H 2 O).
La Demanderesse a en effet pu constater dans chacun de ces cas une augmentation du coefficient d'échange par rapport au bain du fluide cryogénique seul en l'absence d'ultrasons.The Applicant has indeed been able to note in each of these cases an increase in the exchange coefficient compared to the bath of the cryogenic fluid alone in the absence of ultrasound.
La présente invention propose donc un procédé de refroidissement de produits, notamment alimentaires, par immersion des produits dans un bain d'un fluide cryogénique, se caractérisant en ce que durant tout ou partie de l'immersion, le bain est soumis à des ultrasons.The present invention therefore proposes a process for cooling products, especially food products, by immersing the products in a bath of a cryogenic fluid, characterized in that during all or part of the immersion, the bath is subjected to ultrasound.
On l'a donc compris à la lecture de ce qui précède, l'invention propose d'adjoindre un générateur d'ultrasons à un équipement dans lequel un bain d'un fluide cryogénique est utilisé pour refroidir par immersion des produits. Selon un des modes de mise en œuvre de l'invention, l'équipement de refroidissement par immersion est du type comportant une auge, une alimentation en fluide cryogénique, par exemple en azote liquide, et un système vibrant pour le transport des produits au sein de l'auge, équipement que l'on munit selon la présente invention de transducteurs fixés sur les parois de l'auge (conformément à la figure unique annexée). Les ultrasons générés se propagent dans l'azote liquide par l'intermédiaire des parois de la cuve lorsque le système de transducteurs est situé à l'extérieur ou directement transmis lorsque les transducteurs sont immergés dans l'azote liquide. Un tel équipement de type « à support vibrant » est par exemple décrit dans le document EP-A-505 222 ou encore le document EP-1 613 908.It is therefore understood from the above, the invention proposes to add an ultrasonic generator to equipment in which a bath of a cryogenic fluid is used to cool by immersion products. According to one of the embodiments of the invention, the immersion cooling equipment is of the type comprising a trough, a supply of cryogenic fluid, for example liquid nitrogen, and a vibrating system for transporting products within of the trough, equipment that is provided according to the present invention of transducers attached to the walls of the trough (in accordance with the single figure attached). The generated ultrasound propagates in the liquid nitrogen through the walls of the vessel when the transducer system is located outside or directly transmitted when the transducers are immersed in the liquid nitrogen. Such "vibrating support" type equipment is for example described in document EP-A-505 222 or else in document EP-1 613 908.
Un des modes possible de fonctionnement d'un tel système à support vibrant est le suivant : on injecte une quantité d'azote liquide dans le bac, qui est par exemple en configuration de pente légèrement montante. Le trop plein de liquide sort de l'appareil avec les produits. L'azote est alors séparé des produits par une grille située en sortie de dispositif. L'azote ainsi récupéré est recyclé : il est collecté dans une réserve puis pompé par une pompe à piston et repart dans le bac de traitement.One of the possible modes of operation of such a vibrating support system is as follows: an amount of liquid nitrogen is injected into the tank, which is for example in a slightly rising slope configuration. The overflow of liquid comes out of the device with the products. The nitrogen is then separated from the products by a grid located at the device outlet. The nitrogen thus recovered is recycled: it is collected in a reserve and then pumped by a piston pump and goes back into the treatment tank.
Selon d'autres modes de fonctionnement de ces systèmes à auge, l'équipement ne comporte plus de recirculation de fluide cryogénique, le niveau d'azote liquide dans l'auge est contrôlé et un appoint est réalisé en permanence au fur et à mesure de l'évaporation.According to other modes of operation of these trough systems, the equipment no longer comprises recirculation of cryogenic fluid, the level of liquid nitrogen in the trough is controlled and a supplement is made continuously as and when evaporation.
Le niveau d'azote est en général maintenu sensiblement constant dans un réservoir grâce à une vanne pilotée par une sonde qui en mesure le niveau d'azote liquide.The level of nitrogen is generally maintained substantially constant in a tank through a valve controlled by a probe that measures the level of liquid nitrogen.
Ainsi l'azote circule en circuit semi fermé , il ne sort du circuit que par évaporation au contact des produits, cette sortie d'azote est compensée en permanence par l'alimentation de la réserve. Les produits ne font qu'un seul passage dans le bac.Thus the nitrogen circulates in semi-closed circuit, it leaves the circuit only by evaporation in contact with the products, this nitrogen outlet is permanently compensated by the supply of the reserve. The products make only one passage in the tank.
L'invention pourra par ailleurs adopter l'une ou plusieurs des caractéristiques techniques suivantes :The invention may furthermore adopt one or more of the following technical characteristics:
- Le bain est de l'azote liquide ;- The bath is liquid nitrogen;
- Le bain est un mélange d'azote liquide et de neige carbonique ; - Le bain est un mélange d'azote liquide et de neige hydrique (H2O).- The bath is a mixture of liquid nitrogen and dry ice; - The bath is a mixture of liquid nitrogen and watery snow (H 2 O).
- le procédé est mis en œuvre dans un équipement de refroidissement par immersion de type « à support vibrant » comportant une auge, une alimentation en fluide cryogénique, par exemple en azote liquide, et un système vibrant pour le transport des produits au sein de l'auge, équipement que l'on munit selon la présente invention de transducteurs fixés sur les parois de l'auge.the method is implemented in "vibrating support" type immersion cooling equipment comprising a trough, a supply of cryogenic fluid, for example liquid nitrogen, and a vibrating system for transporting products within the trough, equipment that is provided according to the present invention transducers attached to the walls of the trough.
Selon un des modes de mise en œuvre de l'invention, on utilise un fluide cryogénique dont la densité est proche de celle de l'azote liquide, ce qui est un point très avantageux dans la mesure où le mélange est alors stable et ne nécessite pas une agitation mécanique.According to one of the embodiments of the invention, a cryogenic fluid whose density is close to that of liquid nitrogen is used, which is a very advantageous point insofar as the mixture is then stable and does not require not mechanical agitation.
En effet, dans le cas général, les fluides cryogéniques additionnés de particules (neige carbonique, hydrique..) doivent être agités mécaniquement pour les homogénéiser, les particules solides ayant tendance sinon à se déposer dans le fond du bain. Cette séparation est due à la différence de densité entre les particules et l'azote liquide. Or la glace d'eau à une densité assez proche de celle de l'azote liquide ce qui fait que la décantation est plus lente. On préférera donc mettre en œuvre des mélanges azote liquide/neige hydrique puisqu'un tel mélange pourra être maintenu homogène par une faible agitation mécanique, voire par les ultrasons voire tout simplement par l'agitation provoquée par les produits à refroidir eux même.Indeed, in the general case, the cryogenic fluids added particles (dry ice, water ..) must be stirred mechanically to homogenize, the solid particles having a tendency otherwise to be deposited in the bottom of the bath. This separation is due to the difference in density between the particles and the liquid nitrogen. However, water ice at a density close enough to that of liquid nitrogen which makes the decantation is slower. It will therefore be preferable to use liquid nitrogen / water-snow mixtures since such a mixture can be kept homogeneous by low mechanical agitation, or even by ultrasound, or even simply by the agitation caused by the products to be cooled themselves.
A titre illustratif, les transducteurs génèrent des ultrasons dans une plage de 20 à 4OkHz et de préférence entre 30 et 4OkHz. La puissance acoustique est comprise typiquement entre 0.2 à 2 W/cm2.As an illustration, the transducers generate ultrasound in a range of 20 to 40 kHz and preferably between 30 and 40 kHz. The acoustic power is typically between 0.2 to 2 W / cm 2 .
La charge en cristaux (de neige carbonique ou de neige hydrique H2O) apportée au bain d'azote doit être renouvelée périodiquement. En effet une partie des cristaux se sublime lorsqu'il s'agit de CO2 et sont entraînés par les produits et évacués du bain au cours du temps.The charge of crystals (dry ice or H 2 O) to the nitrogen bath must be renewed periodically. Indeed some of the crystals sublimates when it comes to CO 2 and are driven by the products and evacuated from the bath over time.
A titre illustratif (selon les produits à traiter) on peut envisager une quantité de cristaux dans une gamme allant de 20% à 60% de la masse du mélange. Cette quantité sera contrôlée par la durée de l'injection d'eau ou de CO2 liquide.As an illustration (depending on the products to be treated) it is possible to envisage a quantity of crystals in a range of from 20% to 60% of the mass of the mixture. This amount will be controlled by the duration of the injection of water or liquid CO2.
L'invention sera mieux comprise à la lecture des exemples qui suivent. Les augmentations du coefficient d'échange mesurées dans un bain de deux litres de contenance et reportées dans le tableau qui suit sont exprimées suivant le cas : - Sans ultrasons : par rapport à un bain d'azote liquide seul.The invention will be better understood on reading the examples which follow. The increases in the exchange coefficient measured in a bath of two liters capacity and reported in the following table are expressed as appropriate: - Without ultrasound: compared to a bath of liquid nitrogen alone.
- Avec ultrasons : entre le bain considéré sans particules et en présence de particules.- With ultrasound: between the bath considered without particles and in the presence of particles.
Les cas d'azote liquide additionné de particules de glace étaient agités mécaniquement pour homogénéiser les bains. On notera que la mesure du coefficient d'échange est réalisée à partir d'une sphère de cuivre munie d'un capteur de température; le relevé de la température en fonction du temps à partir du moment où la sphère est immergée permet de calculer le flux de chaleur échangé. La surface de la sphère et sa température de surface permettent ensuite de déterminer le coefficient d'échange.The cases of liquid nitrogen added with ice particles were stirred mechanically to homogenize the baths. It will be noted that the measurement of the exchange coefficient is made from a copper sphere provided with a temperature sensor; the measurement of the temperature as a function of time from the moment when the sphere is immersed makes it possible to calculate the heat flux exchanged. The surface of the sphere and its surface temperature then make it possible to determine the exchange coefficient.
Pour chaque situation (avec ou sans ultrasons, avec ou sans particules) plusieurs mesures sont effectuées.For each situation (with or without ultrasound, with or without particles) several measurements are made.
Figure imgf000007_0001
Figure imgf000007_0001
Ces résultats montrent sans ambiguïté tout le bénéfice que l'on obtient en mettant en œuvre des ultrasons au niveau d'un tel bain.These results unambiguously show all the benefit that is obtained by implementing ultrasound at such a bath.
Et l'on peut constater, même si l'effet n'est pas nécessairement bien compris, que l'ajout de particules de neige semble permettre d'atteindre un transfert thermique particules solides / produits qui est meilleur que celui intervenant entre le liquide cryogénique et le produit. And we can see, even if the effect is not necessarily well understood, that the addition of snow particles seems to achieve a heat transfer solid particles / products that is better than that between the cryogenic liquid and the product.

Claims

REVENDICATIONS
1. Procédé de refroidissement de produits, notamment alimentaires, par immersion des produits dans un bain d'un fluide cryogénique, se caractérisant en ce que durant tout ou partie de l'immersion, le bain est soumis à des ultrasons.1. A method of cooling products, especially food, by immersion of the products in a bath of a cryogenic fluid, characterized in that during all or part of the immersion, the bath is subjected to ultrasound.
2. Procédé de refroidissement selon la revendication 1 caractérisé en ce que le fluide cryogénique est de l'azote liquide.2. Cooling method according to claim 1 characterized in that the cryogenic fluid is liquid nitrogen.
3. Procédé de refroidissement selon la revendication 1 caractérisé en ce que le fluide cryogénique est un mélange d'azote liquide et de particules de neige carbonique et/ou hydrique.3. Cooling method according to claim 1 characterized in that the cryogenic fluid is a mixture of liquid nitrogen and dry ice particles and / or water.
4. Procédé de refroidissement selon la revendication 3, caractérisé en ce que le mélange utilisé possède une densité proche de celle de l'azote liquide.4. Cooling method according to claim 3, characterized in that the mixture used has a density close to that of liquid nitrogen.
5. Procédé de refroidissement selon l'une des revendications précédentes, caractérisé en ce que ledit bain est situé dans un équipement de refroidissement par immersion du type comportant une auge, une alimentation en ledit fluide cryogénique, et un système vibrant permettant la progression des produits au sein de l'auge, équipement qui a été muni de transducteurs fixés sur les parois de l'auge afin de générer lesdits ultrasons, se propageant dans le fluide par l'intermédiaire des parois ou directement transmis lorsque les transducteurs sont immergés dans le fluide cryogénique. 5. Cooling method according to one of the preceding claims, characterized in that said bath is located in a type of immersion cooling equipment comprising a trough, a supply of said cryogenic fluid, and a vibrating system for the progression of the products. in the trough, equipment which has been provided with transducers fixed on the walls of the trough to generate said ultrasound, propagating in the fluid through the walls or directly transmitted when the transducers are immersed in the fluid cryogenic.
PCT/FR2009/050497 2008-04-02 2009-03-23 Process for cooling products, especially food products, by immersion in a cryogenic liquid in the presence of ultrasound WO2009125118A1 (en)

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FR0852162A FR2929695A1 (en) 2008-04-02 2008-04-02 METHOD FOR COOLING PRODUCTS, ESPECIALLY FOOD, BY IMMERSION IN A CRYOGENIC LIQUID, IN THE PRESENCE OF ULTRASOUND
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EP2269474A3 (en) * 2009-07-01 2011-05-04 Linde Aktiengesellschaft Method and apparatus for ultrasonic freezing
GB2538706A (en) * 2015-05-19 2016-11-30 Linde Ag Ultrasound and cryogenic gas to destroy campylobacter and other bacteria on foodstuffs
CN106796074A (en) * 2014-06-06 2017-05-31 酷冷高科技有限公司 The husky ice production apparatus of supercooled beverage crystallization with illumination
CN107983718A (en) * 2017-12-28 2018-05-04 徐工集团工程机械有限公司 Fused salt ULTRASONIC COMPLEX cleaning system

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ES2548458A1 (en) * 2014-04-15 2015-10-16 Bsh Electrodomésticos España, S.A. Domestic refrigerator appliance with two storage areas for food and an ultrasonic device, and method for operating a domestic refrigerator (Machine-translation by Google Translate, not legally binding)

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JP2000231666A (en) * 1998-12-07 2000-08-22 Fuji Electric Co Ltd Method and device for heating and cooling liquid in container, and automatic vending machine
FR2853403A1 (en) * 2003-04-07 2004-10-08 Air Liquide Food product total or partial freezing procedure, uses cryogenic liquid temperature probe just before treatment tank outlet
EP1856989A1 (en) * 2006-05-18 2007-11-21 L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Use of a mix of carbon dioxide snow and liquid nitrogen in deep-freeze applications

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JP2000231666A (en) * 1998-12-07 2000-08-22 Fuji Electric Co Ltd Method and device for heating and cooling liquid in container, and automatic vending machine
FR2853403A1 (en) * 2003-04-07 2004-10-08 Air Liquide Food product total or partial freezing procedure, uses cryogenic liquid temperature probe just before treatment tank outlet
EP1856989A1 (en) * 2006-05-18 2007-11-21 L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Use of a mix of carbon dioxide snow and liquid nitrogen in deep-freeze applications

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EP2269474A3 (en) * 2009-07-01 2011-05-04 Linde Aktiengesellschaft Method and apparatus for ultrasonic freezing
CN106796074A (en) * 2014-06-06 2017-05-31 酷冷高科技有限公司 The husky ice production apparatus of supercooled beverage crystallization with illumination
GB2538706A (en) * 2015-05-19 2016-11-30 Linde Ag Ultrasound and cryogenic gas to destroy campylobacter and other bacteria on foodstuffs
CN107983718A (en) * 2017-12-28 2018-05-04 徐工集团工程机械有限公司 Fused salt ULTRASONIC COMPLEX cleaning system

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