EP0341131B1 - Verfahren und Raum zur thermischen Behandlung mit einer Abkühlungsstufe - Google Patents

Verfahren und Raum zur thermischen Behandlung mit einer Abkühlungsstufe Download PDF

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Publication number
EP0341131B1
EP0341131B1 EP89401182A EP89401182A EP0341131B1 EP 0341131 B1 EP0341131 B1 EP 0341131B1 EP 89401182 A EP89401182 A EP 89401182A EP 89401182 A EP89401182 A EP 89401182A EP 0341131 B1 EP0341131 B1 EP 0341131B1
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EP
European Patent Office
Prior art keywords
space
fan
load
treatment
cooling
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.)
Expired - Lifetime
Application number
EP89401182A
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English (en)
French (fr)
Other versions
EP0341131A1 (de
Inventor
Claude Gibot
Jean-Pierre Peyremorte
Richard Sojka
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.)
NOUVELLE DES ETABLISSSEMENTS J LAGARDE Ste
Carboxyque Francaise SA
NOUVELLE des Ets J LAGARDE STE
Original Assignee
NOUVELLE DES ETABLISSSEMENTS J LAGARDE Ste
Carboxyque Francaise SA
NOUVELLE des Ets J LAGARDE STE
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.)
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Application filed by NOUVELLE DES ETABLISSSEMENTS J LAGARDE Ste, Carboxyque Francaise SA, NOUVELLE des Ets J LAGARDE STE filed Critical NOUVELLE DES ETABLISSSEMENTS J LAGARDE Ste
Publication of EP0341131A1 publication Critical patent/EP0341131A1/de
Application granted granted Critical
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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
    • F25D3/102—Stationary cabinets

Definitions

  • the present invention relates to an enclosure for thermal treatment as well as to a thermal treatment method comprising a cooling phase using cryogenic fluid.
  • the present invention relates more particularly to a heat treatment enclosure for a load comprising at least one door, internal walls internally delimiting a load treatment space, and, externally, gas passages, a circulation fan for a gas fluid, disposed at one end of the space, extracting the gases from the space and discharging them into the passages towards the opposite end of the space, and means for injecting cryogenic fluid into the flow of gases arranged in the vicinity of the fan.
  • a heat treatment enclosure for a load comprising at least one door, internal walls internally delimiting a load treatment space, and, externally, gas passages, a circulation fan for a gas fluid, disposed at one end of the space, extracting the gases from the space and discharging them into the passages towards the opposite end of the space, and means for injecting cryogenic fluid into the flow of gases arranged in the vicinity of the fan.
  • loads of many products and objects are treated by cooking and / or sterilization then cooling.
  • This treatment generally includes a hot sterilization or cooking step followed by cooling.
  • the hot stage can be carried out with steam, which is very satisfactory in terms of processing speed and temperature uniformity within the products. Cooling is necessary for the subsequent handling of the objects in the case of sterilization, or for the preservation of the products in the case of food products.
  • Cooling for economic reasons (speed) or for reasons of quality of the cooked products (in the case of food products) must be carried out according to precise and binding temperature profits over time.
  • the cryogenic liquid is injected radially inwards into a chamber downstream of the fan, in an arrangement which is not very conducive to a good mixing of the cryogenic fluid with the circulation flow and tends to accumulate a significant part of the cryogenic fluid on the rear wall of the chamber and on the propeller shaft, with the associated drawbacks.
  • the cryogenic fluid is injected into one of the recirculation passages in the direction towards the upstream chamber through which the fan shaft passes, in an arrangement having the same drawbacks as in the previous document, aggravated by the risk of fluid accumulation cryogenic not yet homogenized in the circulation flow on the upstream part of the load to be treated.
  • the object of the present invention is to provide an enclosure and a heat treatment method guaranteeing efficient cooling kinetics whatever the charge to be cooled, by ensuring an extremely rapid and intimate mixing of the cryogenic fluid in the circulation flow, subjecting the charge. to a homogeneous flow of cold gas and limiting the thermal stresses imposed on the fan drive members.
  • the injection means comprise at least one injection nozzle extending in the downstream part of the treatment space and projecting the cryogenic fluid onto the blades of the fan.
  • the particles of cryogenic fluid are injected into the most turbulent zone and at the highest speed of the gas flow, the aerodynamic effect of the fan being supplemented by a mechanical effect of bursting and mixing of the jet of cryogenic fluid, the temperature homogenization of the circulation flow taking place regularly and uniformly in the return passages before coming to interest the load to be treated.
  • Another subject of the present invention is a method of heat treatment of a charge in a treatment space in an enclosure of the type defined above, comprising a phase of cooling the charge by circulating through the charge of a gas flow sucked in at one end of the space by a fan and recirculated to the opposite end of the space and injection, into the gas flow, of a cryogenic fluid, characterized in that the cryogenic fluid is projected in the treatment space, downstream of the load, on the fan blades.
  • the method comprises, before the cooling phase, a phase of sterilization or cooking of the load with steam.
  • the process and the enclosures according to the invention can be implemented and used in the food industries, the pharmaceutical industries, in hospital pharmacy, in the chemical, plastics and composites industries, for the heat treatment of materials and in industry electronic.
  • the treatment according to the invention is advantageously carried out in a single enclosure, so that all of the treatment, even when the latter comprises a final phase of deep-freezing, can be carried out without manipulation of one enclosure in another enclosure, and without handling or movement of the load in the enclosure where the cooling is perfectly homogeneous.
  • the enclosure is generally cylindrical and heat-insulated, using steam as the heat transfer fluid intended to treat products in cooking, pasteurization, sterilization, or any other type of heat treatment, followed by cooling.
  • the enclosure is of the autoclave type, capable of working under pressure during the entire treatment.
  • the cylindrical enclosure 1 with heat-insulated walls capable of withstanding an overpressure comprises a door 2 .
  • a load 3 of products to be treated is placed in the treatment space 4 delimited by the walls 5.5 ′ of the enclosure 1 , the partitions 6.6 ′ , the door 2 and the truncated cone disposed at the end of the enclosure opposite door 2 .
  • the partitions 6,6 ′ and the cone 7 delimit passages 9,9 ′, 9 ⁇ .
  • the fan 8 is capable of sucking the gas flow out of the treatment space 4 by the cone 7 .
  • the opening 10 of the truncated cone 7 is opposite the fan 8 .
  • the wall of the enclosure 1 is crossed near the fan 8 by at least one pipe 11 for supplying cryogenic fluid provided inside the enclosure 1 with a spray nozzle 12 directing the sprayed fluid towards the fan blades 13 .
  • FIG. 1 Three nozzles are provided, as shown in FIG. 1 where a pipe 14 provided with a valve 15 makes it possible to distribute the cryogenic fluid coming from a reservoir not shown in three nozzles, but only one nozzle 12 is shown in detail. The number of nozzles depends on the capacity of the autoclave.
  • a gas discharge orifice 16 is also provided in the wall 5 of the enclosure.
  • the evacuation of gases is controlled by a valve 17 .
  • the nozzle 12 can be a nozzle for spraying carbon dioxide or liquid nitrogen.
  • the fan 8 When the fan 8 is operating, it circulates the gases as indicated in the figures by the arrows. The gas flow passes through the load 3 placed in the treatment space in the direction of the fan 8 which flows back towards the space 9 ⁇ . During this passage through the charge, it heats up giving its frigories. The cryogenic fluid injected by the nozzle (s) on the blades is refluxed with the gas heated in the space 9 ⁇ . In space 9 ⁇ , the mixture of gas and the cryogenic fluid supply recirculates through passages 9 and 9 ′ towards the opposite end of the autoclave, and crosses the load in the direction of the fan.
  • the method according to the invention can prohibit any contact between the gas and the load during the recirculation.
  • the pressure is regulated by the valve 17 closing the orifice 16 for the gas outlet.
  • the orifice 16 is placed as close as possible to the end of the load, and if possible after the load on the side of the fan.
  • the fan serves as a "flow or ventilated atmosphere + intake” mixer and delivers a homogeneous gas in temperature on its periphery.
  • the cryogenic fluid and the flow thus mix perfectly during their passage through the space 9 ⁇ and the passages 9 and 9 ′ before passing through the charge.
  • the arrangement of the nozzle in the treatment space 4 and not in the space 9 ⁇ has an advantage because the propeller shaft is protected, since it is located in an area not interested in ventilation.
  • the orientation of the nozzle and its positioning in the autoclave, preferably near the fan allow when the solenoid valve opens a total transformation of the liquid CO2 into gas phase by delivering the maximum of frigories.
  • the nozzle directs the jet of CO2 towards the "reaction" propeller for ventilating the autoclave so as to almost instantaneously mix the supply of CO2 with the ventilated atmosphere.
  • the pressure in the autoclave can be regulated.
  • liquid nitrogen can be used.
  • the method according to the invention can be adapted to many types of treatment, both cooking and cooling of packaged foodstuffs or the sterilization and cooling of objects for the pharmaceutical industry and the treatment of blood products in bags. .
  • the temperature must drop from a cooking temperature of the order of 60 ° to 90 ° C, in less than two hours, to a temperature of 10 ° C at its core.
  • This profile can be respected with CO2 for example, as it appears on figure 3 , in a sure way (3 ° C reached) and faster than with forced air (cooled on finned exchanger by fresh water in circulation ) or sprayed 2 ° C ice water.
  • An advantage of the process according to the invention appears when consumable products packaged under gas are cooked and then cooled. Indeed, it is then important that the pressure remains relatively constant during the entire treatment in the enclosure, especially for the appearance of the product.
  • the pressure profile is easily controllable when all the treatment is carried out under cold gas or even hot then cold.
  • the method according to the invention also comprises, or as a cold step, the freezing of the products.
  • CO2 in particular has an advantageous bacteriostatic effect compared to water or air.

Landscapes

  • 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)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Claims (10)

  1. Behälter für die thermische Behandlung einer Charge mit mindestens einer Tür (2), Innenwänden (6, 6', 7), die innenseitig einen Raum (4) zur Behandlung der Charge und außenseitig Gasdurchlässe (9, 9') begrenzen, einem Gebläse (8) zum Erzeugen einer Gaszirkulation, das an einem ersten Ende des Raums (4) angeordnet ist, die Gase aus dem Raum abzieht und sie in die Durchlässe (9, 9') in Richtung des gegenüberliegenden zweiten Endes des Raums fördert, und mit einer in der Nähe des Gebläses angebrachten Einrichtung (12) zur Injektion eines Tieftemperaturfluids in den Gasfluß, dadurch gekennzeichnet, daß die Einrichtung zur Injektion mindestens eine Injektionsdüse (12) aufweist, die sich in den stromabseitigen Teil des Behandlungsraums erstreckt und das Tieftemperaturfluid auf die Flügel des Gebläses (8) ausstößt.
  2. Behälter nach Anspruch 1, gekennzeichnet durch eine einstellbare Gasevakuierungseinrichtung (16, 17), die in der Nähe des ersten Endes des Behandlungsraums (4) angeordnet ist.
  3. Behälter nach Anspruch 1 oder 2, gekennzeichnet durch wärmeisolierte und druckfeste Außenwände.
  4. Verfahren zur thermischen Behandlung einer sich in einem Behandlungsraum (4) in einem Behälter (1) befindenden Charge (3), das eine Phase zur Kühlung der Charge durch Umwälzung eines an einem Ende des Raums (4) mittels eines Gebläses (8) angesaugten, über die Charge geleiteten und in Richtung des entgegengesetzten Endes des Raums zurückgeführten Gasflusses und Injektion eines Tieftemperaturbehandlungsfluids in den Gasfluß umfaßt, dadurch gekennzeichnet, daß das Tieftemperaturfluid während der Kühlphase in den Raum (4) stromabwärts der Charge auf die Flügel des Gebläses (8) ausgestoßen wird.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß der Druck in dem Behälter zumindest während der Kühlphase gesteuert wird.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Kühlphase einen ersten Schritt der Kühlung durch Gebläseluft oder durch Zerstäubung von oder Berieselung mit Wasser aufweist.
  7. Verfahren nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß es vor der Kühlphase eine Phase der Sterilisation oder Erhitzung der Charge mittels Dampf umfaßt.
  8. Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß es des weiteren einen Tiefkühlschritt umfaßt.
  9. Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die gesamte Behandlung unter Druck durchgeführt wird.
  10. Verfahren nach einem der Ansprüche 4 bis 9, dadurch gekennzeichnet, daß das Tieftemperaturfluid Kohlendioxid oder flüssiger Stickstoff ist.
EP89401182A 1988-05-02 1989-04-26 Verfahren und Raum zur thermischen Behandlung mit einer Abkühlungsstufe Expired - Lifetime EP0341131B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8805879 1988-05-02
FR8805879A FR2630818B1 (fr) 1988-05-02 1988-05-02 Enceinte et procede de traitement thermique comportant une phase de refroidissement

Publications (2)

Publication Number Publication Date
EP0341131A1 EP0341131A1 (de) 1989-11-08
EP0341131B1 true EP0341131B1 (de) 1993-09-29

Family

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EP89401182A Expired - Lifetime EP0341131B1 (de) 1988-05-02 1989-04-26 Verfahren und Raum zur thermischen Behandlung mit einer Abkühlungsstufe

Country Status (7)

Country Link
US (2) US4878353A (de)
EP (1) EP0341131B1 (de)
AU (1) AU632746B2 (de)
CA (1) CA1332111C (de)
DE (1) DE68909484T2 (de)
ES (1) ES2044162T3 (de)
FR (1) FR2630818B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5879732A (en) * 1996-09-10 1999-03-09 Boc Group, Inc. Food processing method
JP3346716B2 (ja) * 1997-02-14 2002-11-18 東京エレクトロン株式会社 基板冷却方法および基板冷却装置
US7905154B2 (en) * 2004-11-29 2011-03-15 Jones Jr Arthur T Apparatus and method of contaminant detection for food industry
CN101842629A (zh) * 2007-08-28 2010-09-22 气体产品与化学公司 用于在低温构件上提供无冷凝液和无霜表面的设备和方法
US9587873B2 (en) * 2012-03-27 2017-03-07 Global Cooling, Inc. Energy efficient biological freezer with vial management system
CN106766514A (zh) * 2016-12-02 2017-05-31 青岛海尔股份有限公司 冷藏冷冻设备
JP7674158B2 (ja) * 2021-05-31 2025-05-09 古河機械金属株式会社 硫化リチウム製造装置および硫化リチウムの製造方法

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1802699A1 (de) * 1967-10-13 1969-08-14 J & E Hall Ltd Gefrier- oder Kuehlanlage
US3536132A (en) * 1968-09-27 1970-10-27 Universal Oil Prod Co Freezer-oven unit
US4399658A (en) * 1978-02-08 1983-08-23 Safeway Stores, Incorporated Refrigeration system with carbon dioxide injector
US4237700A (en) * 1979-04-20 1980-12-09 Airco, Inc. Methods and apparatus for providing refrigeration
US4304293A (en) * 1979-06-18 1981-12-08 Helmholtz-Institut Fur Biomedizinische Technik Process and apparatus for freezing living cells
FR2462673A1 (fr) * 1979-08-03 1981-02-13 Carboxyque Francaise Enceinte de refrigeration
CA1128329A (en) * 1981-04-24 1982-07-27 Douglas Hurst Cryogenic treatment of materials
FR2525747A2 (fr) * 1981-05-29 1983-10-28 Keller Jean Paul Procede de surgelation et de conditionnement de produits individuels, et dispositif pour la mise en oeuvre de ce procede
FR2526927A1 (fr) * 1982-05-14 1983-11-18 Anhydride Carbonique Ind Cellule de surgelation et de refroidissement
FR2530004A1 (fr) * 1982-07-07 1984-01-13 Air Liquide Dispositif de congelation de produits biologiques conditionnes en tubes, ampoules ou paillettes
US4481782A (en) * 1983-01-25 1984-11-13 The Boc Group, Inc. Methods and apparatus for refrigerating products
US4475351A (en) * 1983-08-09 1984-10-09 Air Products And Chemicals, Inc. Dual-flow cryogenic freezer
US4644754A (en) * 1984-01-11 1987-02-24 Carboxyque Francaise Process and apparatus for cooling a charge of products
FR2558337B1 (fr) * 1984-01-19 1986-05-02 Air Liquide Dispositif de congelation de produits biologiques conditionnes en paillettes
EP0170580B1 (de) * 1984-07-12 1988-06-01 Carboxyque Francaise Verfahren und Vorrichtung zur Kühlung einer Produktladung
FR2593593B1 (fr) * 1986-01-28 1988-08-26 Carboxyque Francaise Procede et appareil pour realiser dans un objet mou une cavite cylindrique

Also Published As

Publication number Publication date
FR2630818A1 (fr) 1989-11-03
ES2044162T3 (es) 1994-01-01
US4878353A (en) 1989-11-07
FR2630818B1 (fr) 1990-09-14
EP0341131A1 (de) 1989-11-08
DE68909484T2 (de) 1994-05-11
USRE33852E (en) 1992-03-24
AU3388889A (en) 1989-11-02
DE68909484D1 (de) 1993-11-04
AU632746B2 (en) 1993-01-14
CA1332111C (fr) 1994-09-27

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