EP2138783B1 - Procédé continu pour la surgélation individuelle de produits et installation pour la mise en oeuvre du procédé - Google Patents

Procédé continu pour la surgélation individuelle de produits et installation pour la mise en oeuvre du procédé Download PDF

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Publication number
EP2138783B1
EP2138783B1 EP09370011.0A EP09370011A EP2138783B1 EP 2138783 B1 EP2138783 B1 EP 2138783B1 EP 09370011 A EP09370011 A EP 09370011A EP 2138783 B1 EP2138783 B1 EP 2138783B1
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EP
European Patent Office
Prior art keywords
products
freezing
conveyor
section
velocity
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.)
Active
Application number
EP09370011.0A
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German (de)
English (en)
French (fr)
Other versions
EP2138783A3 (fr
EP2138783A2 (fr
Inventor
Alain Maureaux
Laurent Dupont
Lionel Albino
Gilles Grimaud
François Luchini
Myriam Renouleaud
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.)
Bonduelle SA
Original Assignee
Bonduelle SA
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Publication date
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Publication of EP2138783A2 publication Critical patent/EP2138783A2/fr
Publication of EP2138783A3 publication Critical patent/EP2138783A3/fr
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Publication of EP2138783B1 publication Critical patent/EP2138783B1/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
    • F25D13/00—Stationary devices, e.g. cold-rooms
    • F25D13/06—Stationary devices, e.g. cold-rooms with conveyors carrying articles to be cooled through the cooling space
    • F25D13/067—Stationary devices, e.g. cold-rooms with conveyors carrying articles to be cooled through the cooling space with circulation of gaseous cooling fluid

Definitions

  • the present invention relates to a continuous process for the individual quick freezing of products and an installation for the implementation of the method.
  • the cold air passes through a closed circuit and in the upflow direction a layer of product with a determined flow rate to maintain it in suspension and fluidize it.
  • the convection coefficients reach 30 to 60 Wm -2 ° C -1 .
  • RU 203 63 96 a method and an installation for the individual freezing of fruits and vegetables.
  • the products are advanced by a support, namely the carpet of a conveyor, and undergoes successively fluidized bed freezing and fixed bed freezing.
  • Fluidized bed freezing is performed by subjecting the products to a rising cold air flow over a first length section of the conveyor, while the fixed bed freezing step is performed by subjecting said product layer to a flow. cold air coming down.
  • the speed of the downflow is greater than the speed of the rising cold airflow.
  • Product freezing is faster than that of a single fluidized bed tunnel.
  • Document is known US 3864931 a method and an installation for freezing products.
  • the products to be frozen are placed in a layer on the support of a conveyor causing the products to advance.
  • a first upward cold air flow is applied, at different spaced positions of the support so as to form freezing channels at said spaced positions.
  • a second flow of cold, descending air is applied in order to obtain the final freezing of the products.
  • the object of the present invention is to provide an installation for the continuous individual deep freezing of products comprising a fluidized bed freezing section and a fixed bed freezing section, of less expensive and complex design than the installations of the art.
  • Another object of the invention is to propose an installation that can be obtained by modifying the existing IQF tunnels, without reducing their capacity, and at a reasonable cost.
  • Another object of the invention is to provide an installation for continuously processing a large volume of products.
  • Another object of the invention is to provide such a reversible installation, said fixed bed section can become a fluidized bed section.
  • the fixed-bed freezing section has a conveyor for advancing products, said conveyor constituting said support on which the product layer is pressed under the force of the secondary refrigerant flow V2 , the coolant air flow rate V2 being ascending so as to press the products against the lower surface of the conveyor belt under the lift of said flow.
  • the fixed-bed freezing section of the installation has, in addition to the conveyor, said first conveyor, a second conveyor, positioned lower than said first conveyor, for transforming said section into fluidized bed section.
  • the invention relates to an installation for implementing a continuous process for the individual freezing of products.
  • Such a method used in the food industry will find an advantageous application for the preservation of fruits and / or vegetables individualized or in pieces, such as for example green beans, zucchini, peppers ...
  • a layer of products is formed in continuous motion.
  • the product layer is subjected to a fluidized bed type deep freezing step during which the product layer is dynamically suspended under the load of a refrigerant air flow velocity V1 , in order to obtain a freezing of water in the products at their periphery.
  • the product layer is subjected to a fixed-bed type of freezing step during which the product layer is pressed against a support under the force of a flow of water.
  • V2 refrigerant air higher than V1, in order to obtain the total freezing of the water in the products.
  • the fluidized-bed type freezing step only makes it possible to obtain partial freezing of the water in the products.
  • the products are in dynamic suspension, that is to say constantly moving relative to each other, allowing them to freeze on the surface without these agglomerating.
  • a crust of the products is obtained, thus avoiding the agglomeration of the products during the fixed-bed freezing step.
  • the fixed-bed freezing step makes it possible to subject the products to higher coolant flow rates than those of the fluidized bed freezing step.
  • the convection coefficients are therefore much higher than in the fluidized bed freezing step, thus ensuring rapid freezing of products at heart.
  • the fluidized-bed freezing is carried out by subjecting a layer of products P under the lift of a refrigerant air stream 23 ', ascending, on a first section 2' of an installation while the fixed bed step is performed by subjecting said layer to a cool air flow 34 'down on a second section 3' of the installation.
  • the velocity V1 in the fluidized bed type freezing step may advantageously be between 2 m / s and 3 m / s.
  • the fluidized bed freezing stage makes it possible to freeze 20 to 50% of the water in the products.
  • the speed V2 in the fixed-bed freezing step can advantageously be between 3 m / s and 15 m / s, the convection coefficients thus being able to reach values that can range from 200 W. m - 2 . ° C -1 to 300 W. m -2 . ° C -1 .
  • the speeds V1 and V2 are measured below or above the bed of products. Inside the product bed, the speeds are much higher and can approach 20 to 40 m / s according to their apparent density.
  • control of the process can be achieved by monitoring the percentages of the frozen water over time, in particular by taking samples of the products at the end of the fluidized bed freezing step.
  • the invention also relates to an installation 1 for implementing the continuous process for the individual freezing of products.
  • the speed V1 can be between 2 m / s and 3 m / s, the speed V2 between 3 m / s and 15 m / s. These speeds are measured above and below the bed of products.
  • the fixed-bed freezing section 3 comprises a conveyor 35 for advancing the products, said conveyor constituting said support 31 on which the product layer is pressed under the force of the refrigerant air flow 34 of speed V2.
  • the refrigerant air flow 34 of velocity V2 is upward so as to press the products against the lower surface of the conveyor belt 35 under the lift of said flow.
  • Said means 32, 33 for pressing the products against the support 31 under the force of a flow of coolant air velocity V2 may have, in addition to means 32 for ventilation and means 33 for refrigeration, a grid 37 for the distribution and the acceleration of the air flow generated by said ventilation means 32.
  • each freezing section said fluidized bed or said fixed bed can be equipped with an independent conveyor in order to be able to independently adjust the passage times in each of said sections.
  • the percentage of water frozen in the products at the end of said first fluidized bed freezing step can be determined by the speed adjustment of the conveyor 24.
  • the installation 1 of this example comprises a tunnel with a fluidized bed freezing section 2 and a fixed bed freezing section 3.
  • Section 2 comprises a conveyor 24, ventilation means 21 and refrigeration means 22, respectively consisting of fans and cold batteries.
  • a closed circuit allows the circulation of a cool air flow. This flow of air traversed in particular the permeable conveyor belt 24 and allows the suspension of the products under the load of the flow at a speed V1.
  • the suspension is obtained by saccades only, the products remaining only temporarily in height, allowing the conveyor to advance the products towards the section 3 freezing fixed bed.
  • the fixed-bed freezing section 3 comprises a lower conveyor 39, an upper conveyor 35 and a grate 37, and means 33 for refrigeration, with cold batteries and ventilation means 32, with fans.
  • the lower conveyor 39 can convert the fixed bed section 3 into a fluidized bed section by decreasing the speed of the fans to make the line reversible.
  • a comparative analysis was carried out by the inventors on green beans.
  • Curve 8 of the diagram of the figure 3 illustrates the evolution of the temperature of the beans as a function of time, and more particularly the passage of the solidification stage.
  • a second sample of green beans in the form of a layer of thickness 5 cm was subjected to freezing of the fixed bed type with airflow rates of coolant of the order of 7 m / s, in the same temperature conditions as the first sample. This speed is measured above and below the bed of products.
  • Curve 7 of the diagram of the figure 3 illustrates the evolution over time of the temperature of beans as a function of time, and more particularly the passage of the solidification stage.

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)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
EP09370011.0A 2008-06-27 2009-06-19 Procédé continu pour la surgélation individuelle de produits et installation pour la mise en oeuvre du procédé Active EP2138783B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0803628A FR2933173A1 (fr) 2008-06-27 2008-06-27 Procede continu pour la surgelation individuelle de produits et installation pour la mise en oeuvre du procede.

Publications (3)

Publication Number Publication Date
EP2138783A2 EP2138783A2 (fr) 2009-12-30
EP2138783A3 EP2138783A3 (fr) 2010-07-14
EP2138783B1 true EP2138783B1 (fr) 2016-07-06

Family

ID=40329084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09370011.0A Active EP2138783B1 (fr) 2008-06-27 2009-06-19 Procédé continu pour la surgélation individuelle de produits et installation pour la mise en oeuvre du procédé

Country Status (5)

Country Link
EP (1) EP2138783B1 (pl)
ES (1) ES2589153T3 (pl)
FR (1) FR2933173A1 (pl)
PL (1) PL2138783T3 (pl)
PT (1) PT2138783T (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024085751A1 (en) * 2022-10-17 2024-04-25 Lamb Weston / Meijer Tunnel freezer and method for freezing a layer of foodstuffs

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105241155A (zh) * 2015-10-27 2016-01-13 江苏楷益智能科技有限公司 一种方便除霜的流化床冻结机
IT201800005877A1 (it) * 2018-05-30 2019-11-30 Impianto modulare a letto fluido per l'essiccazione e/o surgelazione di alimenti o prodotti alimentari

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH220296A (de) * 1942-02-28 1942-03-31 Sulzer Ag Verfahren zum Kühlen bezw. Gefrieren von Kühlgut und Einrichtung zum Kühlen oder Gefrieren zur Ausübung des Verfahrens.
DE2202293A1 (de) * 1972-01-19 1973-08-02 Sandco Ltd Verfahren und vorrichtung zum gefrieren von lebensmitteln
ES2012343B3 (es) * 1985-11-04 1990-03-16 Grasso's Koninklijke Machf N V Fluidificador para congelacion de alimentos solidos en forma de particulas.
RU2036396C1 (ru) * 1991-04-22 1995-05-27 Андрей Маркович Войтко Способ замораживания плодов и овощей и устройство для его осуществления
JPH1075753A (ja) * 1996-09-05 1998-03-24 Toyo Eng Works Ltd 連続式凍結装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024085751A1 (en) * 2022-10-17 2024-04-25 Lamb Weston / Meijer Tunnel freezer and method for freezing a layer of foodstuffs
NL2033335B1 (en) * 2022-10-17 2024-05-03 Lamb Weston / Meijer Tunnel freezer and method for freezing a layer of foodstuffs

Also Published As

Publication number Publication date
FR2933173A1 (fr) 2010-01-01
PL2138783T3 (pl) 2016-12-30
EP2138783A3 (fr) 2010-07-14
ES2589153T3 (es) 2016-11-10
PT2138783T (pt) 2016-09-01
EP2138783A2 (fr) 2009-12-30

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