WO2001023288A1 - Method and installation for storing organic products - Google Patents

Method and installation for storing organic products Download PDF

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Publication number
WO2001023288A1
WO2001023288A1 PCT/FR2000/002593 FR0002593W WO0123288A1 WO 2001023288 A1 WO2001023288 A1 WO 2001023288A1 FR 0002593 W FR0002593 W FR 0002593W WO 0123288 A1 WO0123288 A1 WO 0123288A1
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WO
WIPO (PCT)
Prior art keywords
oxygen
storage cell
poor
handling
agricultural products
Prior art date
Application number
PCT/FR2000/002593
Other languages
French (fr)
Inventor
Jean-Claude Colin
Philippe Girardon
Original Assignee
L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude
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 L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude filed Critical L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude
Priority to AU75281/00A priority Critical patent/AU7528100A/en
Priority to EP00964319A priority patent/EP1220811A1/en
Publication of WO2001023288A1 publication Critical patent/WO2001023288A1/en

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Classifications

    • 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
    • A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
    • A23L3/3409—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor
    • A23L3/3418—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B9/00—Preservation of edible seeds, e.g. cereals
    • A23B9/16—Preserving with chemicals
    • A23B9/18—Preserving with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B9/00—Preservation of edible seeds, e.g. cereals
    • A23B9/16—Preserving with chemicals
    • A23B9/18—Preserving with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor
    • A23B9/20—Preserving with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O
    • 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
    • A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
    • A23L3/3409—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
    • B65G69/20—Auxiliary treatments, e.g. aerating, heating, humidifying, deaerating, cooling, de-watering or drying, during loading or unloading; Loading or unloading in a fluid medium other than air

Definitions

  • the present invention relates to a method and an installation for storing agricultural products in a silo comprising at least one storage cell, in which is implemented at least one step for handling organic products in at least one essentially closed space of the silo.
  • silos The storage of agricultural products, particularly granular products such as wheat, barley, corn, rye, sunflower or even peas is commonly done in silos.
  • the latter consist of vertical tanks filled from an entrance in their upper part. An outlet provided in the lower part allows the collection of grain after storage.
  • Each vertical tank is called a storage cell.
  • the grain In current installations, the grain is stored under ambient atmospheric conditions. The grain temperature during harvest is often around 30 ° C. Thus, this temperature is commonly found in silos. Even after a long period of intense cold, the temperature in the silos is always above 20 ° C.
  • Fermentation phenomena can generate gases such as methane which are flammable under certain conditions. These flammable gases are produced in the form of continuous emissions and are responsible for gas pockets. In addition, firedamp type phenomena can also be encountered in grain silos. They result from the presence of clouds of organic dust formed during grain handling. Also, the current storage methods in ambient air silos lead to three major drawbacks.
  • a process for preserving cereals in silos is described in application FR-A-2 688 382.
  • the process described in this document provides for sweeping the silo (ie the storage cell) using an inert gas, and especially nitrogen, at room temperature.
  • the inert gas is obtained by selective separation of different components of the air.
  • This process reduces the oxygen concentration of the atmosphere in the cell when it is already filled.
  • EP-B-0 412 471 also describes the use of a gas such as nitrogen or carbon dioxide for the purpose of inerting the silo.
  • a gas such as nitrogen or carbon dioxide
  • the object of the invention is to provide a solution to the fire and explosion problems encountered in silos, at a reasonable cost.
  • the subject of the invention is a method of storing agricultural products in a silo comprising a storage enclosure of the aforementioned type, characterized in that at least one of said steps for handling agricultural products is carried out in means of essentially closed conveying of the silo, and in that before the handling step, said conveying means are previously inert with a gas poor in oxygen.
  • the method comprises one or more of the following characteristics:
  • the or each storage cell is inerted with a gas poor in oxygen before any introduction of new agricultural products; - the oxygen content of the oxygen-poor atmosphere used during the preliminary inerting of an essentially closed space in the silo where agricultural products must be handled is between 4 and 15%;
  • the storage cell is kept under a lean atmosphere in oxygen for only a predetermined period of time, by injecting an oxygen-poor gas into said storage cell, then said storage cell is left without additional oxygen-poor gas supply during the remaining storage period; - Said predetermined duration of maintenance of the storage cell under an oxygen-poor atmosphere is between 15 days and 1 month;
  • the oxygen content of the atmosphere in the storage cell for the predetermined period of maintenance under an oxygen-poor atmosphere is between 0.5 and 2%;
  • the agricultural products are cooled by sweeping with a stream of fresh air;
  • the invention further relates to an installation for storing agricultural products in a silo, characterized in that it comprises essentially closed conveying means in which said agricultural products can be handled, and in that it comprises means prior inerting of said conveying means with a gas poor in oxygen before the handling of agricultural products in said conveying means.
  • the installation shown in FIG. 1 comprises a cell 10 of a vertical silo for storing grain agricultural products, such as wheat. This comprises, at its lower end, an outlet 12 for extracting the products farm. It includes, in its upper part, an inlet 14 for loading agricultural products.
  • the inlet 14 is connected to means 16 for conveying the cereals in the silo.
  • These means include a riser 18 isolated from the outside environment by a sealed envelope. Inside the column 18 is installed a bucket elevator 20 ensuring the transport of the grain to the top of the silo.
  • the riser 18 is connected to a horizontal conveyor
  • the latter is surrounded by a waterproof cover 24, ensuring its isolation from the ambient environment.
  • the cover 24 ensures in particular the confinement of the dust produced during the movement of the grain transported by the conveyor 22.
  • Another conveyor 26 for the evacuation of the grain.
  • This conveyor allows grain to be transported to a loading facility for transport vehicles or to another silo storage cell.
  • the conveyor 26 is also isolated from the outside by a cover 28 surrounding it over its entire length.
  • the installation 10 further comprises means 34 for introducing into the silo a gaseous cooling flow, such as fresh atmospheric air.
  • the means 34 for introducing the cooling flow comprise a blower 36 which takes fresh atmospheric air and routes it to the base of the cell 10 via an injection pipe 38.
  • the cell 10 includes a vent 44 for evacuating excess gas resulting from the sweeping of the silo.
  • means for injecting a gas poor in oxygen, such as nitrogen are provided at the base of the cell 10 and on each of the grain handling means, in order to ensure that they are inerted before any manipulation of the grains is carried out.
  • a nozzle 46 for introducing nitrogen is provided at the base of each storage cell 10.
  • Nitrogen introduction inlets 48 and 50 are provided on the cover 24 of the horizontal conveyor 22 and on the riser 18. Likewise, a nitrogen introduction inlet 52 is provided on the cover 28 of the outlet conveyor 26.
  • the nozzle 46 and the inputs 48, 50 and 52 are connected by a distribution network 54 to a local unit 56 for producing nitrogen from atmospheric air.
  • the local production unit 56 is replaced by a cryogenic nitrogen storage tank 57 at the outlet of which an atmospheric heater is installed.
  • the network 54 comprises, upstream of the tap 46 and the inputs 48, 50, 52, a pilot valve 46a, 48a, 50a, 52a allowing the selective supply of nitrogen, under the control of a central unit for controlling the installation. .
  • the nitrogen storage 57 or the local production unit 56 is installed in the immediate vicinity of the silo.
  • the production unit 56 includes a nitrogen generator by permeating atmospheric air through a permeable membrane.
  • This membrane is advantageously formed of a set of hollow polymer fibers of any suitable type.
  • the generator advantageously includes means for adjusting the purity of the nitrogen obtained at the outlet.
  • the nitrogen content is for example adjustable from 92 to 99.9%.
  • this space is inert with a gas poor in oxygen, prior to the handling of the cereals.
  • the oxygen-poor gas is advantageously impure nitrogen.
  • Impure nitrogen for example, has a purity of 92 to 97%.
  • the inerting of the storage cell 10 and of the means 16 for routing the grain into the cell is first carried out.
  • impure nitrogen is introduced inside the storage cell 10.
  • nitrogen is introduced for a period of between 12 and 24 hours.
  • impure nitrogen of the same quality is introduced into the riser 18 and into the space delimited by the cover 24 of the conveyor 22.
  • the substantially enclosed space inside which the handling means are installed being relatively reduced, impure nitrogen is introduced during ten minutes before the use of the handling means.
  • the quantities of nitrogen introduced for the prior inerting of the cell or of the handling means are sufficient so that the oxygen content is between 4 and 15% and is advantageously substantially less than 9%.
  • the oxygen content inside the closed system is brought to a value between 4% and 15% of oxygen.
  • This content depends on the nature of the organic product stored and in particular on the nature of the dust it produces. For example, for wheat dust, a content of about 9% is suitable. This value is the minimum content for which, whatever the dust concentration, combustion is not possible. This content can be reached by impure nitrogen with a purity of 92 to 97% or pure nitrogen (stored in liquefied or compressed form) depending on economic conditions.
  • the grain is gradually transferred inside the cell 10 using the conveyors 22 and 20.
  • impure nitrogen of the same quality is continuously introduced into cell 10 and into the conveying means 16.
  • pure nitrogen that is to say having a nitrogen concentration greater than 99.5% is introduced by the nozzle 46 at the base of the cell.
  • Nitrogen is introduced with a flow rate depending on the volume of the cell 10 between 50 and 200 m 3 / h and in particular 100 m 3 / h.
  • the introduction of pure nitrogen is carried out in an amount sufficient to ensure that an oxygen content of between 0.5 and 2% is obtained in cell 10.
  • This low oxygen content is maintained for a predetermined duration, between 8 days and 1 month and advantageously substantially equal to 15 days. Maintaining the very low oxygen content in the cell is ensured by the continuous introduction of pure nitrogen in order to compensate for the nitrogen losses and the oxygen entries resulting from the inevitable leaks through the walls of the cell. During maintenance, the flow of pure nitrogen is between 50 and 200 m 3 / h depending on the volume of the cell.
  • Maintaining a very low oxygen content inside the cell for a determined time ensures the destruction of insects introduced during loading of the silo.
  • the latter At the end of the phase of maintaining a very low oxygen content inside the cell, the latter is subjected to a sweep with fresh air from the means 34 in order to ensure the cooling of the stored grains.
  • This cooling is carried out on a cool night, in order to introduce air charges taken outside the silo. Thanks to the scanning thus carried out of the cell, the temperature of the stored grains goes from the temperature of introduction of the grains substantially equal to 30 ° C. to a temperature close to 20 ° C.
  • the cell 10 is first inerted by the introduction of impure nitrogen by the nozzle 46 before any movement of the grains.
  • the enclosure delimited by the cover 28 of the outlet conveyor 26 is inerted by the introduction of impure nitrogen from the inlet 52 before any grain circulation.
  • the handling means, as well as the grain departure and arrival cells are inert, thus ensuring that the grain circulates only in closed spaces where the oxygen content is very low and advantageously less than 6%.
  • the cell filling process can be implemented by reversing the phase of cooling in atmospheric air and the phase of maintaining the silo for a predetermined period under a very low oxygen content.
  • air cooling is advantageously carried out only after the silo has been kept under a very low oxygen content.
  • the high temperature prevailing in the silo associated with the absence of oxygen promotes the destruction of insects.
  • the process described here makes it possible to eliminate most of the risks of explosion or involuntary fire, while using only a reduced amount of nitrogen.
  • the annual nitrogen consumption per cell is around 4000 m 3 .
  • the process described here is also suitable for the storage of all types of organic products such as cocoa, flour, or sugar.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Polymers & Plastics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Food Science & Technology (AREA)
  • Wood Science & Technology (AREA)
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Abstract

The invention concerns a method for storing organic products in a silo comprising at least a storage cell, wherein is carried out a step which consists in handling organic products in at least a substantially enclosed space of the silo. The invention is characterised in that at least one of said steps consisting in handling agricultural products is carried out in conveying means (20, 22, 26) substantially enclosed in the silo, and prior to the handling step, the conveying means (20, 22, 26) are made inert with an oxygen-poor gas. The invention further concerns a silo for implementing said method. The invention is applicable to storage of cereals.

Description

PROCEDE ET INSTALLATION DE STOCKAGE DE PRODUITS PROCESS AND INSTALLATION FOR STORING PRODUCTS
ORGANIQUESORGANIC
La présente invention concerne un procédé et une installation de stockage de produits agricoles dans un silo comportant au moins une cellule de stockage, dans lequel est mis en œuvre au moins une étape de manutention des produits organiques dans au moins un espace essentiellement clos du silo.The present invention relates to a method and an installation for storing agricultural products in a silo comprising at least one storage cell, in which is implemented at least one step for handling organic products in at least one essentially closed space of the silo.
Le stockage des produits agricoles, notamment les produits granuleux tels que le blé, l'orge, le maïs, le seigle, le tournesol ou encore les petits pois se fait couramment dans des silos. Ces derniers sont constitués par des réservoirs verticaux emplis depuis une entrée ménagée dans leur partie supérieure. Une sortie prévue en partie basse permet le recueil du grain après stockage. Chaque réservoir vertical est appelé une cellule de stockage.The storage of agricultural products, particularly granular products such as wheat, barley, corn, rye, sunflower or even peas is commonly done in silos. The latter consist of vertical tanks filled from an entrance in their upper part. An outlet provided in the lower part allows the collection of grain after storage. Each vertical tank is called a storage cell.
Dans les installations actuelles, le grain est stocké dans les conditions atmosphériques ambiantes. La température des grains lors de la récolte est souvent de l'ordre de 30°C. Ainsi, cette température est couramment constatée dans les silos. Même après une longue période de froid intense, la température dans les silos reste toujours supérieure à 20°C.In current installations, the grain is stored under ambient atmospheric conditions. The grain temperature during harvest is often around 30 ° C. Thus, this temperature is commonly found in silos. Even after a long period of intense cold, the temperature in the silos is always above 20 ° C.
Sous l'action de la chaleur, des phénomènes biologiques se produisent. Ils conduisent à la fermentation et/ou à l'oxydation des produits agricoles entreposés. De plus, la chaleur favorise la germination des grains en cas de séchage incomplet.Under the action of heat, biological phenomena occur. They lead to fermentation and / or oxidation of stored agricultural products. In addition, the heat promotes germination of the grains in the event of incomplete drying.
Les phénomènes de fermentation peuvent engendrer des gaz tels que du méthane qui sont inflammables dans certaines conditions. Ces gaz inflammables sont produits sous forme d'émissions continues et sont à l'origine de poches de gaz. De plus, des phénomènes de type grisou peuvent également être rencontrés dans les silos à grains. Ils résultent de la présence de nuages de poussières organiques formées lors de la manutention du grain. Aussi, les procédés actuels de stockage en silos à l'air ambiant conduisent à trois inconvénients majeurs.Fermentation phenomena can generate gases such as methane which are flammable under certain conditions. These flammable gases are produced in the form of continuous emissions and are responsible for gas pockets. In addition, firedamp type phenomena can also be encountered in grain silos. They result from the presence of clouds of organic dust formed during grain handling. Also, the current storage methods in ambient air silos lead to three major drawbacks.
Tout d'abord, les risques d'incendie et d'explosion sont élevés du fait de rémission de gaz inflammables, comme expliqué précédemment. Ces risques sont notamment très présents lors de la manutention des grains, qui, une fois mis en mouvement libèrent beaucoup de poussières formant des nuages explosifs. Dans les espaces clos du silo, un incendie même naissant est très difficile à combattre et celui-ci se propage alors à l'ensemble du silo provoquant sa destruction par explosion. De plus, les phénomènes de germination, fermentation et oxydation des grains conduisent à une dégradation progressive de la qualité du produit.First of all, the risk of fire and explosion is high due to the emission of flammable gases, as explained above. These risks are particularly present during the handling of the grains, which, once set in motion, release a lot of dust forming explosive clouds. In the closed spaces of the silo, even an incipient fire is very difficult to fight and it then spreads throughout the silo causing its destruction by explosion. In addition, the phenomena of germination, fermentation and oxidation of the grains lead to a progressive deterioration in the quality of the product.
Enfin, la présence de produits agricoles regroupés en un même lieu est propice au développement d'insectes ou d'arachnéides, dont le développement doit être stoppé par la mise en œuvre de traitements chimiques dont l'emploi nuit à la préservation de l'environnement et la santé.Finally, the presence of agricultural products gathered in the same place is conducive to the development of insects or arachnids, whose development must be stopped by the implementation of chemical treatments whose use harms the preservation of the environment and health.
Un procédé de conservation des céréales en silo est décrit dans la demande FR-A-2 688 382. Le procédé décrit dans ce document prévoit de balayer le silo (i.e la cellule de stockage) à l'aide d'un gaz inerte, et notamment d'azote, à température ambiante. Le gaz inerte est obtenu par une séparation sélective de différents composants de l'air.A process for preserving cereals in silos is described in application FR-A-2 688 382. The process described in this document provides for sweeping the silo (ie the storage cell) using an inert gas, and especially nitrogen, at room temperature. The inert gas is obtained by selective separation of different components of the air.
Ce procédé réduit la concentration en oxygène de l'atmosphère contenue dans la cellule lorsque celle-ci est déjà rempli.This process reduces the oxygen concentration of the atmosphere in the cell when it is already filled.
EP-B-0 412 471 décrit également l'utilisation d'un gaz tel que l'azote ou le dioxyde de carbone en vue de l'inertage du silo. Dans ces deux documents, seule la réduction de la teneur en oxygène de l'atmosphère dans le silo plein est envisagée afin de réduire les risques de destruction des produits stockés.EP-B-0 412 471 also describes the use of a gas such as nitrogen or carbon dioxide for the purpose of inerting the silo. In these two documents, only the reduction of the oxygen content of the atmosphere in the full silo is envisaged in order to reduce the risks of destruction of the stored products.
Or, l'abaissement significatif et permanent de la teneur en oxygène de l'atmosphère dans le silo nécessite l'emploi de grandes quantités de gaz inerte, ce qui augmente le coût d'exploitation de silo. On peut également citer le fait que dans certains pays, des recommandations gouvernementales sont allées dans le sens de l'équipement des silos avec des systèmes d'évents dans la partie supérieures des cellules de stockage. Il est néanmoins apparu très rapidement que de tels systèmes seraient totalement inefficaces pour certaines géométries d'installations.However, the significant and permanent reduction in the oxygen content of the atmosphere in the silo requires the use of large quantities of inert gas, which increases the cost of operating the silo. We can also cite the fact that in certain countries, government recommendations have gone in the direction of equipping the silos with vent systems in the upper part of the storage cells. However, it quickly became apparent that such systems would be totally ineffective for certain geometries of installations.
L'invention a pour but d'apporter une solution aux problèmes d'incendie et d'explosion rencontrés dans les silos, et ce pour un coût raisonnable. A cet effet, l'invention a pour objet un procédé de stockage de produits agricoles dans un silo comportant une enceinte de stockage du type précité, se caractérisant en ce que au moins une desdites étapes de manutention des produits agricoles est effectuée dans des moyens de convoyage essentiellement clos du silo, et en ce que avant l'étape de manutention, lesdits moyens de convoyage sont préalablement inertes avec un gaz pauvre en oxygène.The object of the invention is to provide a solution to the fire and explosion problems encountered in silos, at a reasonable cost. To this end, the subject of the invention is a method of storing agricultural products in a silo comprising a storage enclosure of the aforementioned type, characterized in that at least one of said steps for handling agricultural products is carried out in means of essentially closed conveying of the silo, and in that before the handling step, said conveying means are previously inert with a gas poor in oxygen.
Suivant des modes particuliers de mise en œuvre, le procédé comporte l'une ou plusieurs des caractéristiques suivantes :According to particular modes of implementation, the method comprises one or more of the following characteristics:
- avant toute étape de manutention des produits organiques dans des espaces essentiellement clos du silo, tous les espaces clos dans lesquels la manutention doit avoir lieu sont inertes préalablement avec un gaz pauvre en oxygène ;- before any step of handling organic products in essentially closed spaces of the silo, all the closed spaces in which handling must take place are inert beforehand with a gas poor in oxygen;
- la ou chaque cellule de stockage est inertée avec un gaz pauvre en oxygène avant toute introduction de nouveaux produits agricoles ; - la teneur en oxygène de l'atmosphère pauvre en oxygène mise en œuvre lors de l'inertage préalable d'un espace essentiellement clos du silo où des produits agricoles doivent être manipulés est comprise entre 4 et 15 % ;the or each storage cell is inerted with a gas poor in oxygen before any introduction of new agricultural products; - the oxygen content of the oxygen-poor atmosphere used during the preliminary inerting of an essentially closed space in the silo where agricultural products must be handled is between 4 and 15%;
- après remplissage d'une cellule de stockage avec des produits agricoles, la cellule de stockage est maintenue sous une atmosphère pauvre en oxygène pendant seulement une période de durée prédéterminée, par injection d'un gaz pauvre en oxygène dans ladite cellule de stockage, puis ladite cellule de stockage est laissée sans apport de gaz pauvre en oxygène supplémentaire pendant la période restante de stockage ; - ladite durée prédéterminée de maintien de la cellule de stockage sous une atmosphère pauvre en oxygène est comprise entre 15 jours et 1 mois ;- after filling a storage cell with agricultural products, the storage cell is kept under a lean atmosphere in oxygen for only a predetermined period of time, by injecting an oxygen-poor gas into said storage cell, then said storage cell is left without additional oxygen-poor gas supply during the remaining storage period; - Said predetermined duration of maintenance of the storage cell under an oxygen-poor atmosphere is between 15 days and 1 month;
- la teneur en oxygène de l'atmosphère dans la cellule de stockage pendant la durée prédéterminée de maintien sous une atmosphère pauvre en oxygène est comprise entre 0,5 et 2% ;- the oxygen content of the atmosphere in the storage cell for the predetermined period of maintenance under an oxygen-poor atmosphere is between 0.5 and 2%;
- après remplissage d'une cellule de stockage avec des produits agricoles, les produits agricoles sont refroidis par balayage avec un courant d'air frais ; et- after filling a storage cell with agricultural products, the agricultural products are cooled by sweeping with a stream of fresh air; and
- ledit balayage des produits agricoles avec un courant d'air frais est réalisé après la période de maintien de la cellule de stockage sous une atmosphère pauvre en oxygène.- Said sweeping of agricultural products with a stream of fresh air is carried out after the period of keeping the storage cell under an oxygen-poor atmosphere.
L'invention a en outre pour objet une installation de stockage de produits agricoles dans un silo, caractérisée en ce qu'elle comporte des moyens de convoyage essentiellement clos dans lesquels lesdits produits agricoles peuvent être manutentionnés, et en ce qu'elle comprend des moyens d'inertage préalable desdits moyens de convoyage avec un gaz pauvre en oxygène avant la manutention des produits agricoles dans lesdits moyens de convoyage.The invention further relates to an installation for storing agricultural products in a silo, characterized in that it comprises essentially closed conveying means in which said agricultural products can be handled, and in that it comprises means prior inerting of said conveying means with a gas poor in oxygen before the handling of agricultural products in said conveying means.
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple, et faite en référence à la figure unique qui est une vue schématique d'une installation de stockage de produits agricoles selon l'invention.The invention will be better understood on reading the description which follows, given only by way of example, and made with reference to the single figure which is a schematic view of an installation for storing agricultural products according to the invention .
L'installation représentée sur la figure 1 comporte une cellule 10 d'un silo vertical de stockage de produits agricoles en grain, tel que du blé. Celle- ci comporte, à son extrémité inférieure, une sortie 12 d'extraction des produits agricoles. Elle comporte, dans sa partie supérieure, une entrée 14 de chargement des produits agricoles.The installation shown in FIG. 1 comprises a cell 10 of a vertical silo for storing grain agricultural products, such as wheat. This comprises, at its lower end, an outlet 12 for extracting the products farm. It includes, in its upper part, an inlet 14 for loading agricultural products.
L'entrée 14 est reliée à des moyens 16 d'acheminement des céréales dans le silo. Ces moyens comportent une colonne montante 18 isolée du milieu extérieur par une enveloppe étanche. A l'intérieur de la colonne 18 est installé un élévateur à godets 20 assurant le transport du grain jusqu'au sommet du silo.The inlet 14 is connected to means 16 for conveying the cereals in the silo. These means include a riser 18 isolated from the outside environment by a sealed envelope. Inside the column 18 is installed a bucket elevator 20 ensuring the transport of the grain to the top of the silo.
A sa base, la colonne montante 18 est reliée à un convoyeur horizontalAt its base, the riser 18 is connected to a horizontal conveyor
22 de transport du grain. Celui-ci est entouré d'un capot étanche 24, assurant son isolation du milieu ambiant. Le capot 24 assure en particulier le confinement des poussières produites lors du mouvement du grain transporté par le convoyeur 22.22 grain transport. The latter is surrounded by a waterproof cover 24, ensuring its isolation from the ambient environment. The cover 24 ensures in particular the confinement of the dust produced during the movement of the grain transported by the conveyor 22.
A la sortie 12 de la cellule est installé un autre convoyeur 26 pour l'évacuation du grain. Ce convoyeur permet d'acheminer les grains vers une installation de chargement de véhicules de transport ou vers une autre cellule de stockage du silo.At the outlet 12 of the cell is installed another conveyor 26 for the evacuation of the grain. This conveyor allows grain to be transported to a loading facility for transport vehicles or to another silo storage cell.
Le convoyeur 26 est également isolé de l'extérieur par un capot 28 l'entourant sur toute sa longueur.The conveyor 26 is also isolated from the outside by a cover 28 surrounding it over its entire length.
L'installation 10 comporte en outre des moyens 34 d'introduction dans le silo d'un flux gazeux de refroidissement, tel que de l'air atmosphérique frais.The installation 10 further comprises means 34 for introducing into the silo a gaseous cooling flow, such as fresh atmospheric air.
Ces moyens sont adaptés pour un balayage vertical de la cellule de sa partie inférieure vers sa partie supérieure avec le flux gazeux de refroidissement. Les moyens 34 d'introduction du flux de refroidissement comportent une soufflante 36 prélevant de l'air atmosphérique frais et acheminant celui-ci à la base de la cellule 10 par l'intermédiaire d'une conduite d'injection 38.These means are suitable for vertical scanning of the cell from its lower part to its upper part with the cooling gas flow. The means 34 for introducing the cooling flow comprise a blower 36 which takes fresh atmospheric air and routes it to the base of the cell 10 via an injection pipe 38.
Dans sa partie supérieure, la cellule 10 comporte un évent 44 d'évacuation des excès gazeux résultant du balayage du silo. En outre, et selon l'invention, des moyens d'injection d'un gaz pauvre en oxygène, tel que de l'azote sont prévus à la base de la cellule 10 et sur chacun des moyens de manutention des grains, afin d'assurer un inertage de ceux-ci avant la mise en oeuvre de toute manipulation des grains. En particulier, un piquage 46 d'introduction d'azote est prévu à la base de chaque cellule de stockage 10.In its upper part, the cell 10 includes a vent 44 for evacuating excess gas resulting from the sweeping of the silo. In addition, and according to the invention, means for injecting a gas poor in oxygen, such as nitrogen are provided at the base of the cell 10 and on each of the grain handling means, in order to ensure that they are inerted before any manipulation of the grains is carried out. In particular, a nozzle 46 for introducing nitrogen is provided at the base of each storage cell 10.
Des entrées d'introduction d'azote 48 et 50 sont prévues sur le capot 24 du convoyeur horizontal 22 et sur la colonne montante 18. De même, une entrée 52 d'introduction d'azote est prévue sur le capot 28 du convoyeur de sortie 26.Nitrogen introduction inlets 48 and 50 are provided on the cover 24 of the horizontal conveyor 22 and on the riser 18. Likewise, a nitrogen introduction inlet 52 is provided on the cover 28 of the outlet conveyor 26.
Le piquage 46 et les entrées 48, 50 et 52 sont reliés par un réseau de distribution 54 à une unité locale 56 de production d'azote à partir d'air atmosphérique.The nozzle 46 and the inputs 48, 50 and 52 are connected by a distribution network 54 to a local unit 56 for producing nitrogen from atmospheric air.
En variante, l'unité locale 56 de production est remplacée par un réservoir 57 de stockage cryogénique d'azote en sortie duquel est installé un réchauffeur atmosphérique.As a variant, the local production unit 56 is replaced by a cryogenic nitrogen storage tank 57 at the outlet of which an atmospheric heater is installed.
Sur la figure, l'unité 56 et le réservoir 57 ont tous deux été représentés. Toutefois, seul l'un d'entre eux est mis en œuvre.In the figure, the unit 56 and the tank 57 have both been shown. However, only one of them is implemented.
Le réseau 54 comporte en amont du piquage 46 et des entrées 48, 50, 52, une vanne pilotée 46a, 48a, 50a, 52a permettant l'alimentation sélective en azote, sous la commande d'une unité central de pilotage de l'installation.The network 54 comprises, upstream of the tap 46 and the inputs 48, 50, 52, a pilot valve 46a, 48a, 50a, 52a allowing the selective supply of nitrogen, under the control of a central unit for controlling the installation. .
Le stockage d'azote 57 ou l'unité locale de production 56 est installée au voisinage immédiat du silo.The nitrogen storage 57 or the local production unit 56 is installed in the immediate vicinity of the silo.
Avantageusement, l'unité de production 56 comporte un générateur d'azote par perméation de l'air atmosphérique au travers d'une membrane perméable. Cette membrane est avantageusement formée d'un ensemble de fibres creuses en polymère de tout type adapté. De plus, le générateur comporte avantageusement des moyens de réglage de la pureté de l'azote obtenue en sortie. Ainsi, la teneur en azote est par exemple réglable de 92 à 99, 9%. L'installation représentée sur la Figure 1 fonctionne de la manière suivante.Advantageously, the production unit 56 includes a nitrogen generator by permeating atmospheric air through a permeable membrane. This membrane is advantageously formed of a set of hollow polymer fibers of any suitable type. In addition, the generator advantageously includes means for adjusting the purity of the nitrogen obtained at the outlet. Thus, the nitrogen content is for example adjustable from 92 to 99.9%. The installation shown in Figure 1 operates as follows.
De manière générale et selon l'invention, avec toute manipulation de grains dans un espace essentiellement clos du silo, cet espace est inerte avec un gaz pauvre en oxygène, préalablement à la manutention des céréales. Le gaz pauvre en oxygène est avantageusement de l'azote impur.In general and according to the invention, with any handling of grains in an essentially closed space of the silo, this space is inert with a gas poor in oxygen, prior to the handling of the cereals. The oxygen-poor gas is advantageously impure nitrogen.
L'azote impur a par exemple une pureté de 92 à 97%.Impure nitrogen, for example, has a purity of 92 to 97%.
En particulier, afin d'assurer le chargement de céréales dans le silo, on procède d'abord à l'inertage préalable de la cellule de stockage 10 et des moyens 16 d'acheminement du grain dans la cellule. A cet effet, on introduit de l'azote impur à l'intérieur de la cellule de stockage 10. Suivant le volume de la cellule 10 à inerter, de l'azote est introduit pendant une durée comprise entre 12 et 24 heures.In particular, in order to ensure the loading of cereals into the silo, the inerting of the storage cell 10 and of the means 16 for routing the grain into the cell is first carried out. To this end, impure nitrogen is introduced inside the storage cell 10. Depending on the volume of the cell 10 to be inerted, nitrogen is introduced for a period of between 12 and 24 hours.
De même, de l'azote impur de même qualité est introduit dans la colonne montante 18 et dans l'espace délimité par le capot 24 du convoyeur 22. L'espace sensiblement clos à l'intérieur duquel sont installés les moyens de manutention étant relativement réduit, de l'azote impur est introduit pendant une dizaine de minutes avant l'utilisation des moyens de manutention. Les quantités d'azote introduites pour l'inertage préalable de la cellule ou des moyens de manutention sont suffisantes pour que la teneur en oxygène soit comprise entre 4 et 15 % et soit avantageusement sensiblement inférieure à 9 %.Likewise, impure nitrogen of the same quality is introduced into the riser 18 and into the space delimited by the cover 24 of the conveyor 22. The substantially enclosed space inside which the handling means are installed being relatively reduced, impure nitrogen is introduced during ten minutes before the use of the handling means. The quantities of nitrogen introduced for the prior inerting of the cell or of the handling means are sufficient so that the oxygen content is between 4 and 15% and is advantageously substantially less than 9%.
La teneur en oxygène à l'intérieur du système clos (élévateur, convoyeur et cellule) est amenée à une valeur comprise entre 4 % et 15 % d'oxygène. Cette teneur dépend de la nature du produit organique stocké et notamment de la nature des poussières qu'il produit. Par exemple, pour la poussière de blé, une teneur d'environ 9 % convient. Cette valeur est la teneur minimum pour laquelle quelle que soit la concentration en poussière, la combustion n'est pas possible. Cette teneur peut être atteinte par de l'azote impur d'une pureté de 92 à 97 % ou de l'azote pur (stocké sous forme liquéfiée ou comprimée) selon les conditions économiques.The oxygen content inside the closed system (elevator, conveyor and cell) is brought to a value between 4% and 15% of oxygen. This content depends on the nature of the organic product stored and in particular on the nature of the dust it produces. For example, for wheat dust, a content of about 9% is suitable. This value is the minimum content for which, whatever the dust concentration, combustion is not possible. This content can be reached by impure nitrogen with a purity of 92 to 97% or pure nitrogen (stored in liquefied or compressed form) depending on economic conditions.
Alors que la cellule 10 est initialement inertée, ainsi que les moyens d'acheminement 16, le grain est transféré progressivement à l'intérieur de la cellule 10 à l'aide des transporteur 22 et 20.While the cell 10 is initially inerted, as well as the routing means 16, the grain is gradually transferred inside the cell 10 using the conveyors 22 and 20.
Pendant le remplissage de la cellule 10, qui peut durer plusieurs heures, de l'azote impur de même qualité est introduit en continu dans la cellule 10 et dans les moyens d'acheminement 16.During the filling of cell 10, which can last several hours, impure nitrogen of the same quality is continuously introduced into cell 10 and into the conveying means 16.
Après remplissage de la cellule 10, de l'azote pur, c'est-à-dire ayant une concentration en azote supérieure à 99,5% est introduit par le piquage 46 à la base de la cellule. L'azote est introduit avec un débit compris en fonction du volume de la cellule 10 entre 50 et 200 m3/h et notamment de 100 m3/h. L'introduction de l'azote pur est effectuée en quantité suffisante pour assurer l'obtention, dans la cellule 10, d'une teneur en oxygène comprise entre 0, 5 et 2%.After filling the cell 10, pure nitrogen, that is to say having a nitrogen concentration greater than 99.5% is introduced by the nozzle 46 at the base of the cell. Nitrogen is introduced with a flow rate depending on the volume of the cell 10 between 50 and 200 m 3 / h and in particular 100 m 3 / h. The introduction of pure nitrogen is carried out in an amount sufficient to ensure that an oxygen content of between 0.5 and 2% is obtained in cell 10.
Cette faible teneur en oxygène est maintenue pendant une durée prédéterminée, comprise entre 8 jours et 1 mois et avantageusement sensiblement égale à 15 jours. Le maintien de la teneur très faible en oxygène dans la cellule est assuré par l'introduction en continu d'azote pur afin de compenser les pertes d'azote et les entrées d'oxygène résultant des fuites inévitables au travers des parois de la cellule. Lors du maintien, le débit d'azote pur est compris en fonction du volume de la cellule entre 50 et 200 m3/h.This low oxygen content is maintained for a predetermined duration, between 8 days and 1 month and advantageously substantially equal to 15 days. Maintaining the very low oxygen content in the cell is ensured by the continuous introduction of pure nitrogen in order to compensate for the nitrogen losses and the oxygen entries resulting from the inevitable leaks through the walls of the cell. During maintenance, the flow of pure nitrogen is between 50 and 200 m 3 / h depending on the volume of the cell.
Le maintien d'une très faible teneur en oxygène à l'intérieur de la cellule pendant un temps déterminé assure la destruction des insectes introduit lors du chargement du silo.Maintaining a very low oxygen content inside the cell for a determined time ensures the destruction of insects introduced during loading of the silo.
Au terme de la phase de maintien d'une très faible teneur en oxygène à l'intérieur de la cellule, celle-ci est soumise à un balayage à l'air frais depuis les moyens 34 afin d'assurer le refroidissement des grains stockés. Ce refroidissement est effectué lors d'une nuit fraîche, afin d'introduire de l'air frais prélevé hors du silo. Grâce au balayage ainsi effectué de la cellule, la température des grains stockés passe de la température d'introduction des grains sensiblement égal à 30°C à une température proche de 20°C.At the end of the phase of maintaining a very low oxygen content inside the cell, the latter is subjected to a sweep with fresh air from the means 34 in order to ensure the cooling of the stored grains. This cooling is carried out on a cool night, in order to introduce air charges taken outside the silo. Thanks to the scanning thus carried out of the cell, the temperature of the stored grains goes from the temperature of introduction of the grains substantially equal to 30 ° C. to a temperature close to 20 ° C.
A l'issue de cette phase de refroidissement, effectuée sur la durée d'une nuit, la cellule est laissée en l'état, sans introduction ultérieure d'air ou d'azote. Ainsi, tant qu'aucune manipulation n'est effectuée sur les grains stockés, ceux-ci sont laissés dans le silo dans une atmosphère d'air atmosphérique.At the end of this cooling phase, carried out over the course of one night, the cell is left as it is, without subsequent introduction of air or nitrogen. Thus, as long as no manipulation is carried out on the stored grains, these are left in the silo in an atmosphere of atmospheric air.
Lors de la manipulation des grains contenus dans la cellule 10, et notamment l'extraction des grains de celle-ci, la cellule 10 est d'abord inertée par introduction d'azote impur par le piquage 46 avant tout mouvement des grains. De même, l'enceinte délimitée par le capot 28 du convoyeur de sortie 26 est inertée par introduction d'azote impur depuis l'entrée 52 avant toute circulation de grains. Ainsi, lors de la mise en mouvement du grain, tous les espaces clos à l'intérieur desquels le grain est manipulé sont préalablement inertes, de sorte que la teneur en oxygène y est très faible.During the handling of the grains contained in the cell 10, and in particular the extraction of the grains from the latter, the cell 10 is first inerted by the introduction of impure nitrogen by the nozzle 46 before any movement of the grains. Similarly, the enclosure delimited by the cover 28 of the outlet conveyor 26 is inerted by the introduction of impure nitrogen from the inlet 52 before any grain circulation. Thus, during the setting in motion of the grain, all the enclosed spaces inside which the grain is handled are previously inert, so that the oxygen content is very low there.
De même, si les grains doivent être transférés d'une cellule de stockage vers une autre, avant toute manipulation des grains, les moyens de manipulation, ainsi que les cellules de départ et d'arrivée du grain sont inertes, assurant ainsi que le grain ne circule que dans des espaces clos où la teneur en oxygène est très faible et avantageusement inférieure à 6%.Likewise, if the grains must be transferred from one storage cell to another, before any manipulation of the grains, the handling means, as well as the grain departure and arrival cells are inert, thus ensuring that the grain circulates only in closed spaces where the oxygen content is very low and advantageously less than 6%.
On conçoit que en effectuant préalablement à toute manipulation des produits agricoles un inertage des espaces clos dans lesquels ceux-ci sont manipulés, tout risque d'incendie ou d'explosion est écarté du fait de la très faible teneur en oxygène dans les espaces de circulation ou de réception des produits agricoles.It is understood that by carrying out prior to any manipulation of agricultural products inerting of the enclosed spaces in which they are handled, any risk of fire or explosion is eliminated due to the very low oxygen content in the circulation spaces or receiving agricultural products.
En variante, le procédé de remplissage des cellules peut être mis en oeuvre en inversant la phase de refroidissement à l'air atmosphérique et la phase de maintien du silo pendant une durée prédéterminée sous une très faible teneur en oxygène. Toutefois, le refroidissement à l'air est avantageusement effectué seulement à l'issue du maintien du silo sous une très faible teneur en oxygène. En effet, la température élevée régnant dans le silo, associée à l'absence d'oxygène favorise la destruction des insectes. Le procédé décrit ici permet d'écarter l'essentiel des risques d'explosion ou d'incendies involontaires, tout en utilisant qu'une quantité réduite d 'azote.Alternatively, the cell filling process can be implemented by reversing the phase of cooling in atmospheric air and the phase of maintaining the silo for a predetermined period under a very low oxygen content. However, air cooling is advantageously carried out only after the silo has been kept under a very low oxygen content. Indeed, the high temperature prevailing in the silo, associated with the absence of oxygen promotes the destruction of insects. The process described here makes it possible to eliminate most of the risks of explosion or involuntary fire, while using only a reduced amount of nitrogen.
A titre d'exemple pour un silo ayant des cellules verticales de 950 m3 d'une hauteur de 33,5 m et de 6 m de diamètre, la consommation annuelle d'azote par cellule est d'environ 4000 m3.For example, for a silo with vertical cells of 950 m 3 with a height of 33.5 m and 6 m in diameter, the annual nitrogen consumption per cell is around 4000 m 3 .
Le calcul de la consommation est effectué avec les hypothèses suivantes :The consumption is calculated with the following assumptions:
- débit de fuite des cellules de 10 m3/h- cell leakage rate of 10 m 3 / h
- débit d'inertage des moyens de manutention : 120 m3/h - temps de fonctionnement par utilisation des moyens de manutention :- inerting flow of handling equipment: 120 m 3 / h - operating time by using handling equipment:
20 mn20 mins
- débit des moyens de manutention : 150 t/h- throughput of handling equipment: 150 t / h
- nombre de remplissages annuels : 2 par cellule- number of annual refills: 2 per cell
- nombre de transilages annuels : 6 par cellules - durée de maintien à 2% d'oxygène dans la cellule : 15 jours.- number of annual transilages: 6 per cell - duration of maintenance at 2% of oxygen in the cell: 15 days.
Le procédé décrit ici convient également au stockage de tout type de produits organiques tels que du cacao, de la farine, ou du sucre. The process described here is also suitable for the storage of all types of organic products such as cocoa, flour, or sugar.

Claims

REVENDICATIONS
1.- Procédé de stockage de produits organiques dans un silo comportant au moins une cellule de stockage (10), dans lequel est mise en oeuvre au moins une étape de manutention des produits organiques dans au moins un espace essentiellement clos du silo, caractérisé en ce que au moins une desdites étapes de manutention desdits produits agricoles est effectuée dans des moyens de convoyage (20,1.- Method for storing organic products in a silo comprising at least one storage cell (10), in which is implemented at least one step for handling organic products in at least one essentially closed space of the silo, characterized in that at least one of said steps for handling said agricultural products is carried out in conveying means (20,
22, 26) essentiellement clos du silo, et en ce que avant l'étape de manutention, lesdits moyens de convoyage (20, 22, 26) sont préalablement inertes avec un gaz pauvre en oxygène.22, 26) essentially closed from the silo, and in that before the handling step, said conveying means (20, 22, 26) are previously inert with an oxygen-poor gas.
2.- Procédé selon la revendication 1 , caractérisé en ce que avant toute étape de manutention des produits organiques dans des espaces essentiellement clos du silo, tous les espaces clos dans lesquels la manutention doit avoir lieu sont inertes préalablement avec un gaz pauvre en oxygène.2.- Method according to claim 1, characterized in that before any step of handling organic products in essentially closed spaces of the silo, all the closed spaces in which the handling must take place are inert beforehand with a gas poor in oxygen.
3.- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la ou chaque cellule (10) de stockage est inertée avec un gaz pauvre en oxygène avant toute introduction de nouveaux produits agricoles. 3.- Method according to any one of the preceding claims, characterized in that the or each storage cell (10) is inerted with a gas poor in oxygen before any introduction of new agricultural products.
4.- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que pendant le remplissage de l'une ou chaque cellule (10) de stockage avec des produits agricoles, la ou chaque cellule (10) de stockage concernée par ledit remplissage est inertée avec un gaz pauvre en oxygène. 4.- Method according to any one of the preceding claims, characterized in that during the filling of one or each storage cell (10) with agricultural products, the or each storage cell (10) concerned by said filling is inerted with an oxygen-poor gas.
5.- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que au moins l'une des dites étapes de manutention est une étape d'extraction de produits agricoles d'une cellule, et en ce que :5.- Method according to any one of the preceding claims, characterized in that at least one of the said handling steps is a step of extracting agricultural products from a cell, and in that:
- la cellule (10) de stockage concernée par ladite extraction est préalablement à l'extraction inertée avec un gaz pauvre en oxygène, et - les moyens de convoyage utilisés pour réaliser ladite extraction sont préalablement à l'extraction inertes avec un gaz pauvre en oxygène. - the storage cell (10) concerned by said extraction is prior to the inerted extraction with an oxygen-poor gas, and - the conveying means used to carry out said extraction are prior to the inert extraction with an oxygen-poor gas .
6.- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que au moins l'une des dites étapes de manutention est une étape de transfert de produits agricoles d'une cellule de stockage vers une autre, et en ce que avant toute manipulation des produits, les cellules de départ et d'arrivée des produits ainsi que les moyens de convoyage des produits entre les cellules de départ et d'arrivée sont préalablement inertes avec un gaz pauvre en oxygène.6.- Method according to any one of the preceding claims, characterized in that at least one of said handling steps is a step of transferring agricultural products from one storage cell to another, and in that before any handling of the products, the cells of departure and arrival of the products as well as the means of conveying the products between the cells of departure and arrival are previously inert with a gas poor in oxygen.
7.- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la teneur en oxygène de ladite atmosphère pauvre en oxygène est comprise entre 4 et 15 %.7.- Method according to any one of the preceding claims, characterized in that the oxygen content of said oxygen-poor atmosphere is between 4 and 15%.
8.- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que, après remplissage d'une cellule de stockage (10) avec des produits agricoles, la cellule de stockage est maintenue sous une atmosphère pauvre en oxygène pendant seulement une période de durée prédéterminée, par injection d'un gaz pauvre en oxygène dans ladite cellule de stockage (10), puis ladite cellule de stockage (10) est laissée sans apport de gaz pauvre en oxygène supplémentaire pendant la période restante de stockage.8.- Method according to any one of the preceding claims, characterized in that, after filling a storage cell (10) with agricultural products, the storage cell is maintained under an oxygen-poor atmosphere for only a period of predetermined duration, by injecting an oxygen-poor gas into said storage cell (10), then said storage cell (10) is left without supply of additional oxygen-poor gas during the remaining storage period.
9.- Procédé selon la revendication 8, caractérisé en ce que ladite durée prédéterminée de maintien de la cellule de stockage (10) sous une atmosphère pauvre en oxygène est comprise entre 15 jours et 1 mois.9.- Method according to claim 8, characterized in that said predetermined duration of maintenance of the storage cell (10) in an atmosphere poor in oxygen is between 15 days and 1 month.
10.- Procédé selon la revendication 8 ou 9, caractérisé en ce que la teneur en oxygène de l'atmosphère dans la cellule de stockage (10) pendant la durée prédéterminée de maintien sous une atmosphère pauvre en oxygène est comprise entre 0,5 et 2%.10.- Method according to claim 8 or 9, characterized in that the oxygen content of the atmosphere in the storage cell (10) during the predetermined period of maintenance under an atmosphere poor in oxygen is between 0.5 and 2%.
11.- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que après remplissage d'une cellule de stockage avec des produits agricoles, les produits agricoles sont refroidis par balayage avec un courant d'air frais. 11.- Method according to any one of the preceding claims, characterized in that after filling a storage cell with agricultural products, the agricultural products are cooled by sweeping with a stream of fresh air.
12.- Procédé selon la revendication 11 prise avec l'une quelconque des revendications 8 à 10, caractérisé en ce que ledit balayage des produits agricoles avec un courant d'air frais est réalisé après la période de maintien de la cellule de stockage sous une atmosphère pauvre en oxygène.12.- Method according to claim 11 taken with any one of claims 8 to 10, characterized in that said scanning of the products After a period of maintenance of the storage cell in an oxygen-poor atmosphere, agricultural operations are carried out with a stream of fresh air.
13.- Installation de stockage de produits agricoles comportant un silo muni d'au moins une cellule de stockage (10) et comportant des moyens de manutention (20, 22, 26) des produits agricoles dans au moins un espace essentiellement clos du silo, caractérisée en ce que l'installation comporte des moyens de convoyage (20, 22, 26) essentiellement clos dans lesquels lesdits produits agricoles peuvent être manutentionnés, et en ce qu'elle comprend des moyens d'inertage préalable desdits moyens de convoyage (20, 22, 26) avec un gaz pauvre en oxygène avant la manutention des produits agricoles dans lesdits moyens de convoyage (20, 22, 26). 13.- Storage facility for agricultural products comprising a silo provided with at least one storage cell (10) and comprising handling means (20, 22, 26) for agricultural products in at least one essentially enclosed space in the silo, characterized in that the installation comprises essentially closed conveying means (20, 22, 26) in which said agricultural products can be handled, and in that it comprises means for prior inerting of said conveying means (20, 22, 26) with an oxygen-poor gas before the handling of agricultural products in said conveying means (20, 22, 26).
PCT/FR2000/002593 1999-09-29 2000-09-19 Method and installation for storing organic products WO2001023288A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU75281/00A AU7528100A (en) 1999-09-29 2000-09-19 Method and installation for storing organic products
EP00964319A EP1220811A1 (en) 1999-09-29 2000-09-19 Method and installation for storing organic products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR99/12155 1999-09-29
FR9912155A FR2798918B1 (en) 1999-09-29 1999-09-29 METHOD AND INSTALLATION FOR STORING ORGANIC PRODUCTS

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WO2001023288A1 true WO2001023288A1 (en) 2001-04-05

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PCT/FR2000/002593 WO2001023288A1 (en) 1999-09-29 2000-09-19 Method and installation for storing organic products

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EP (1) EP1220811A1 (en)
AU (1) AU7528100A (en)
FR (1) FR2798918B1 (en)
WO (1) WO2001023288A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091676A (en) * 2016-08-16 2016-11-09 广西联壮科技股份有限公司 Multilamellar dries bunker lift formula potter's clay calciner plant

Citations (12)

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Publication number Priority date Publication date Assignee Title
GB559074A (en) * 1941-12-22 1944-02-03 William R Graham Jr Improvements in and relating to methods of and apparatus for preserving vegetable and food materials
US3685431A (en) * 1969-10-29 1972-08-22 Obed W Stone Machine for killing insects
JPS5817027A (en) * 1981-07-17 1983-02-01 Fuji Photo Film Co Ltd Apparatus for carrying and supplying readily oxidizable powder and particle
DE3444942A1 (en) * 1984-12-10 1985-05-15 Sauerstoffwerk Friedrich Guttroff GmbH, 6980 Wertheim Method and device for the long-term conservation of moist cereals
US4537043A (en) * 1983-05-27 1985-08-27 Messer Griesheim Gmbh Procedure for creating an inert gas atmosphere with constant composition of nitrogen and carbon dioxide in a refrigerated container
DE3832390A1 (en) * 1988-09-23 1990-04-05 Bernd Dipl Chem Dr Penth Process and apparatus for the destruction of food pests
FR2643232A1 (en) * 1988-12-16 1990-08-24 Mansour Robert Method for protecting a large number of articles during storage and preservation periods, by using the evacuation of air followed by the introduction of an inert gas in a closed cycle
EP0412471A1 (en) * 1989-08-08 1991-02-13 Linde Aktiengesellschaft Process for pest control in granular foodstuffs stored in containers
WO1992002261A1 (en) * 1990-08-01 1992-02-20 Robert Gobran Mansour Method for preserving a plurality of items by creating an inert gas atmosphere in a closed circuit
US5090971A (en) * 1989-08-16 1992-02-25 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and apparatus for gas treatment of a product
EP0491247A1 (en) * 1990-12-18 1992-06-24 Thyssen Still Otto Anlagentechnik GmbH Process for explosion-proof drying of sewage sludge
FR2688382A1 (en) * 1992-03-10 1993-09-17 Francois Denis Process for the preservation of cereal grain or other similar food products

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB559074A (en) * 1941-12-22 1944-02-03 William R Graham Jr Improvements in and relating to methods of and apparatus for preserving vegetable and food materials
US3685431A (en) * 1969-10-29 1972-08-22 Obed W Stone Machine for killing insects
JPS5817027A (en) * 1981-07-17 1983-02-01 Fuji Photo Film Co Ltd Apparatus for carrying and supplying readily oxidizable powder and particle
US4537043A (en) * 1983-05-27 1985-08-27 Messer Griesheim Gmbh Procedure for creating an inert gas atmosphere with constant composition of nitrogen and carbon dioxide in a refrigerated container
DE3444942A1 (en) * 1984-12-10 1985-05-15 Sauerstoffwerk Friedrich Guttroff GmbH, 6980 Wertheim Method and device for the long-term conservation of moist cereals
DE3832390A1 (en) * 1988-09-23 1990-04-05 Bernd Dipl Chem Dr Penth Process and apparatus for the destruction of food pests
FR2643232A1 (en) * 1988-12-16 1990-08-24 Mansour Robert Method for protecting a large number of articles during storage and preservation periods, by using the evacuation of air followed by the introduction of an inert gas in a closed cycle
EP0412471A1 (en) * 1989-08-08 1991-02-13 Linde Aktiengesellschaft Process for pest control in granular foodstuffs stored in containers
US5090971A (en) * 1989-08-16 1992-02-25 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and apparatus for gas treatment of a product
WO1992002261A1 (en) * 1990-08-01 1992-02-20 Robert Gobran Mansour Method for preserving a plurality of items by creating an inert gas atmosphere in a closed circuit
EP0491247A1 (en) * 1990-12-18 1992-06-24 Thyssen Still Otto Anlagentechnik GmbH Process for explosion-proof drying of sewage sludge
FR2688382A1 (en) * 1992-03-10 1993-09-17 Francois Denis Process for the preservation of cereal grain or other similar food products

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 092 (M - 208) 16 April 1983 (1983-04-16) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091676A (en) * 2016-08-16 2016-11-09 广西联壮科技股份有限公司 Multilamellar dries bunker lift formula potter's clay calciner plant

Also Published As

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EP1220811A1 (en) 2002-07-10
FR2798918B1 (en) 2001-11-09
FR2798918A1 (en) 2001-03-30
AU7528100A (en) 2001-04-30

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