EP2712497A1 - Method for filtering an air stream in a grain dryer - Google Patents

Method for filtering an air stream in a grain dryer Download PDF

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Publication number
EP2712497A1
EP2712497A1 EP13186307.8A EP13186307A EP2712497A1 EP 2712497 A1 EP2712497 A1 EP 2712497A1 EP 13186307 A EP13186307 A EP 13186307A EP 2712497 A1 EP2712497 A1 EP 2712497A1
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EP
European Patent Office
Prior art keywords
flow
air
grains
filtration
grain
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Granted
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EP13186307.8A
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German (de)
French (fr)
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EP2712497B1 (en
Inventor
Laurent LALLOUET
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CERES
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Ceres (societe Par Actions Simplifiee)
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/003—Supply-air or gas filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/10—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/06—Grains, e.g. cereals, wheat, rice, corn

Definitions

  • the present invention relates to the field of agricultural machinery equipment, intended mainly for agricultural or agro-food industries.
  • the present invention is particularly intended to apply in grain dryers.
  • the invention more particularly relates to a method and an air filtration device for recycling the flow of air flowing in a grain dryer.
  • a grain dryer allows, after the harvest of the latter, their drying. Indeed, when said grains are harvested on the base of the plant, they have not had time to dry sufficiently. The presence of residual moisture in the grains may be problematic at the time of storage of said grains, including promoting fermentation and oxidation thereof. Therefore, the use of a grain dryer, after harvest, is essential to store grain in optimal conditions and to prevent degradation of the latter.
  • a grain dryer intended for this type of application consists of at least one column, in which the grains can circulate in particular by gravity.
  • the grains are deposited in bulk at the top of the column and come out dry in the lower part.
  • the grains are in contact with air having a greater or lesser temperature, the air circulating in the columns of the dryer being traditionally recycled.
  • Recycling air in traditional grain dryers is generally allowed by the installation of at least one filter, for example "bag filters", often used in industrial settings.
  • the sleeve filters which can be arranged either horizontally or vertically, allow a separation of the dust transported by a stream of air and collected in a conduit.
  • Patent documents RU 2191061 , JP 2000001224 and JP 11124232 describe in particular the use of bag filters for trapping dust at the time of recycling the air circulating in a grain dryer.
  • Handle filters have the advantage of allowing efficient separation of dust; however, said filters that equip the grain dryers must regularly undergo unclogging operations.
  • a grain dryer comprising a sleeve filter must be stopped on average once every week, in particular in order to clean those filters which are clogged with dust.
  • This tedious and time-consuming operation is however necessary; indeed, the presence of a clogged sleeve filter may on the one hand significantly reduce the performance of the grain dryer and on the other hand to cause an increase in energy consumption of the dryer.
  • the patent document JP 2000 001224 proposes a device in which grains or powders are discharged through a conduit from a container.
  • an envelope which is equipped with an air replacement port.
  • a filter is positioned, the outer part of which is covered with a cap connected to a dust collector.
  • a clearance is provided between said cap and the filter, so as to allow an inflow of air from outside the device.
  • this device has a certain number of drawbacks, and in particular, it does not allow active drying, by an air flow, of the product which circulates through the duct, and, as a result, recirculation and recirculation of the airflow is not planned.
  • the invention offers the possibility of overcoming the various drawbacks of the state of the art by proposing a method and a device for filtering the air circulating in a dryer, not requiring a weekly shutdown of the grain dryer to proceed. unclogging the filter.
  • the air flow is filtered a second time, after it has returned to the flow of grains, the particles from the second filtration being then blown.
  • the present invention also relates to a device for implementing the method according to the invention consisting of a grain dryer comprising a vertical drying column, allowing the passage of a stream of grains for drying and drying. cooling them by a circulation of an air flow substantially perpendicular to the flow direction of the flow of grains, said device being characterized in that it comprises at least one filtration means for filtering the air flow leaving said column and the retention of particles present in said air flow, said device further comprising at least one mobile air blowing means associated with the filtration means, allowing blowing of the particles resulting from the filtration, said means of blowing being supplied with air by at least one means for supplying air.
  • the filtration means consists of at least one flat filter, the latter comprising at least one filtration level, and extending over at least a portion of the height of said vertical drying column of the grain dryer.
  • said flat filter has two levels of filtration, each of the filtration levels consisting of a filter plate.
  • said flat filter is contained in a plane.
  • said flat filter comprises two sections, each of these sections being contained in two different planes.
  • the air supply means of the blowing means consists of a fan disposed in the lower part of the grain dryer, and / or an onboard fan associated with the blowing means.
  • the mobile blowing means consists of a blowing nozzle, the latter being disposed on the side of the filtration means opposite to that in which the drying column is located, said blowing nozzle having substantially the same width that said filtering means and having at least air sensing means.
  • the device also comprises conveying means for moving the blowing means along said filtering means.
  • the present invention has many advantages.
  • the method and the device according to the invention allow drying of the grains.
  • a recycling of all the air circulating in the lower part of the dryer is carried out; in fact, the flow of air, entering the grain dryer, and passing through the flow of grains, is then completely filtered before passing to the upper part of said dryer where said air flow is heated then back to the through the grain flow.
  • the air passing through the grains in the upper part of the dryer is also preferably recycled.
  • the method and the device according to the invention make it possible to prevent the filtration means, preferably consisting of a flat filter, from clogging due to the presence of dust; indeed, the blowing step by means in particular of at least one blowing nozzle results in efficient cleaning, automatic and continuous all of the filtration means.
  • the invention therefore has an undeniable economic advantage and saves time on the maintenance of grain dryers.
  • the present invention relates to a method for filtering an air flow in a grain dryer 1, said method according to the invention advantageously allowing optimum recycling of all the air flow used in said grain dryer 1.
  • the method according to the present invention further allows grain drying with said air flow.
  • an external air flow is introduced into the grain dryer 1.
  • the inlet of the air flow may in particular be effected via an inlet orifice 2, the latter preferably being located in the lower part, or lower, of said grain dryer 1.
  • a grain stream is then discharged into the grain dryer 1 by gravity.
  • this stream of grains is poured inside a vertical drying column 3 situated in said dryer 1.
  • grains are passed through a plurality of drying and cooling zones 31 to 34 so as to allow optimum drying of the latter.
  • the external air flow that has been introduced into the grain dryer 1 passes firstly through the flow of grains at a lower drying zone 33 and a cooling zone 34. the drying column 3.
  • the flow of air passes initially through the flow of grains in the lower part of the grain dryer 1, at the lower zones referenced 33 and 34, possibly after being heated.
  • the air is again preferentially heated and directed to the upper part of said dryer 1 where it will pass through the flow of the grains again, at the level of the upper drying zones 31 and 32, located upstream of the zones 33 and 34, with respect to the flow of grains.
  • particles are blown out from the filtration, so as to eliminate them and allow the realization of a new filtration cycle of a flow of air.
  • This last blowing step which follows the filtration step, makes it possible to avoid having to stop the drying cycles in order to unclog the means used for filtering the product. air flow.
  • the saving of time made possible by the implementation of the method according to the present invention, is therefore not negligible.
  • the particles once blown, then descend along the means used for filtration and reach a recovery system, located in the lower part of said filtering means, allowing the evacuation of these particles.
  • the stream of recycled air After the stream of recycled air has passed through the flow of grain a second time, it can again undergo a filtration step, which can be followed by a step of blowing the particles.
  • the flow of air which can be filtered a second time, can then be discharged to the outside of the dryer 1.
  • the present invention also relates to a device for implementing the method described above.
  • the device for carrying out the process according to the invention consists of a grain dryer 1.
  • a grain dryer 1 This comprises in particular a vertical drying column 3 through which a stream of grains passes, thus allowing drying and then cooling the grains.
  • said vertical column 3 preferably comprises a plurality of drying zones and a grain cooling zone, for example four zones, referenced 31 to 34 in the attached figure.
  • zones 31 to 33 consist of drying zones and zone 34 a cooling zone. The drying and cooling of the grains is allowed, in the zones 31 to 34 of the column 3, by the passage of an air flow, in a direction substantially perpendicular to the flow direction of the flow of grains within the vertical column 3.
  • the device according to the invention also comprises at least one filtration means, intended to filter the flow of air leaving the vertical column 3 after said air flow has passed through the flow of grains to drying these, especially at the lower zones of drying 33 and cooling 34.
  • Said filtration means advantageously allows a retention of particles and / or dust entrained by the air flow at the time of the passage of the latter through the grains.
  • the device may also comprise a second filtering means, in particular for filtering the flow of air leaving the upper drying zones 31 and 32.
  • the filtration means consists of a flat filter 4, visible on the figure 1 .
  • said flat filter 4 may be contained in a single plane.
  • said flat filter 4 has several sides, for example two sides; in other words, the flat filter 4 may be contained in several planes, for example two planes, so as to increase the filtration area.
  • the flat filter 4 may also, according to a preferred embodiment, comprise, for example, a filtration level, which may consist of a filter plate, or else a plurality of substantially parallel filtration levels, for example two filtration levels, these the last ones can have either an identical mesh, or a different mesh.
  • a filtration level which may consist of a filter plate, or else a plurality of substantially parallel filtration levels, for example two filtration levels, these the last ones can have either an identical mesh, or a different mesh.
  • the mesh of the first level of filtration allows the retention of impurities having a certain size
  • the mesh of the second level of filtration, crossed by the air flow after a passage in the first level of filtration allows the retention of impurities having a size smaller than that retained by said first level of filtration.
  • said flat filter 4 extends parallel to the vertical drying column 3 and over at least a portion of the height of said column 3.
  • the flat filter 4 extends over the part of the drying column 4 corresponding to the lower drying and cooling zones 34. Indeed, it is the flow of air passing through these lower zones 33 and 34 which is preferably recycled through a passage through the filtration means, in particular a flat filter 4, said recycled air stream can then be used in the upper drying zones 31 and 32.
  • the device may also comprise a plurality of flat filters, for example 4 and 41, each having at least one level of filtration, each of these filtration levels may preferably consist of a filter plate.
  • said device comprises two filters 4 and 41
  • the flat filter 41 allows a filtration of the air flow after passage thereof at the upper part of the column 3, which corresponds more particularly to the drying zones 31 and 32.
  • the air flow is therefore free of impurities and can be redirected to the upper drying zones 31 and 32 of the column 3 after having been heated via at least one means. for heating, for example burners 61 and 62.
  • the device further comprises at least one mobile air blowing means, the latter being supplied with air by at least one air supply means.
  • the mobile air blowing means advantageously allows blowing of the particles which are trapped in the filtration means, the latter being able to consist of a flat filter 4.
  • the air blown by the blowing means is represented, on the figure 1 , by the hatched arrows.
  • each of these levels is preferably associated with a mobile air blowing means.
  • this mobile air blowing means may consist of a blowing nozzle 8 shown schematically on the figure 2 attached.
  • said nozzle 8 has substantially the same width as the filtering means, for example the same width as the flat filter 4, also shown in FIG. figure 2 . In this way, it is possible to eliminate, in a single passage with the blast nozzle 8, the dust and particles retained over the entire width of the flat filter 4.
  • Said blowing nozzle 8 is preferably disposed on the side of the filtering means which is opposite the side where the drying column 3 is located.
  • the air blown by the blast nozzle 8 passes through the filtration means in the opposite direction to that taken by the flow of air passing through this means. This allows a particularly satisfactory elimination of the particles and dust trapped in the filtration means, the latter preferably consisting of a flat filter 4.
  • each of these filters 4, 41 may be associated with a mobile blowing means, such as a blowing nozzle 8 , so as to allow optimal removal of the particles retained at the time of passage of the air flow in the filter 4, 41.
  • the blowing means in particular the blast nozzle 8, comprises means for collecting air 9, these means 9 being able to consist in particular of a lip nozzle device.
  • this can in particular consist of a fan 5 and / or an onboard fan, the latter not being shown in the figures.
  • the air supply means preferably consists of a fan 5.
  • Said fan 5 is preferably arranged in the lower part of the grain dryer 1. It advantageously propels air under pressure in a column 10, this propelled air coming from an air column 7 of the dryer 1, in which the air is in depression.
  • the air sensing means 9 of the blast nozzle 8 make it possible to take air which is sent under pressure into the column 10 by the fan 5, thus supplying air the blast nozzle 8 to eliminate particles trapped in the flat filter 4.
  • an on-board fan is associated with the blowing means for unclogging the flat filter 41 situated in the upper part of the dryer 1, facing the zones 31 and 32 of the column 3.
  • an on-board fan makes it possible to supply the medium continuously. air blowing.
  • said onboard ventilator withdraws air that has been filtered to return it to overpressure at said flat filter 41, via a blowing nozzle, so as to allow removal of the impurities retained by said flat filter 41 .
  • the device according to the invention also comprises conveying means 11 of the mobile blowing means. More particularly, these conveying means 11 allowing in particular a displacement of said blowing means along the flat filter 4 by pulling from the bottom to the top and by gravity, or by pulling, from the top to the bottom.
  • conveying means 11 allowing in particular a displacement of said blowing means along the flat filter 4 by pulling from the bottom to the top and by gravity, or by pulling, from the top to the bottom.
  • the displacement of the blowing means over the entire height of the filter Plate 4 allows an integral cleaning of the latter by removing the particles.
  • the conveying means 11 consist of a winch, not shown on the figure 2 , associated with support means represented by the visible cables in this figure.
  • the method and the device according to the invention have many advantages.
  • the main advantage is that all the air used in the lower part of the dryer is recycled for reuse in the upper part of the same dryer. In other words, it is not necessary, unlike traditional methods and devices, to blow outside air and mix it with recycled air.
  • the air coming from the outside necessarily has a temperature lower than the recycled air which has already circulated through the column 3; therefore, to be brought to the proper temperature for the drying of the grains, the outside air requires a greater energy expenditure than the recycled air.
  • the method and the device according to the invention make it possible to improve the grain drying efficiency.
  • Another advantage of the invention conferred by the use of flat filters 4, 41, associated with the blowing nozzles 8, lies in the fact that it avoids the introduction of complicated, expensive and bulky suction devices. requiring the installation of piping, motor and control cabinets.
  • the blowing system of the present invention allows a removal in the lower part of the dust and particles retained in the flat filter 4 and blown by the nozzle 8; the particles can then be discharged to a waste zone.
  • the blowing system put in place does not require stopping of the drying of the grains, since the unclogging of the filter is carried out continuously, in particular by the blast nozzle.

Abstract

The method comprises: making an exterior air stream to enter into a grain dryer (1); introducing a flow of grains by gravity into the grain dryer; passing the air stream through the grain flow in a direction perpendicular to a direction of the flow of grain; filtering the air stream when it is passed through the grains so as to retain particles present in the air stream; heating the filtered flow and then directing to an upstream of the flow of grain such that the filtered flow recrosses the grains; and blowing the particles from the filtered flow. The method comprises: making an exterior air stream to enter into a grain dryer (1); introducing a flow of grains by gravity into the grain dryer; passing the air stream through the grain flow in a direction perpendicular to a direction of the flow of grain; filtering the air stream when it is passed through the grains so as to retain particles present in the air stream; heating the filtered flow and then directing to an upstream of the flow of grain such that the filtered flow recrosses the grains; and blowing the particles from the filtered flow. The air flow is again filtered, after it is recrossed over the grain flow, where the particles resulting from the second filtration is then blown. An independent claim is included for a device for filtering an air stream in a grain dryer.

Description

La présente invention concerne le domaine des équipements de machines agricoles, destinés principalement aux industries agricoles ou agro-alimentaires.The present invention relates to the field of agricultural machinery equipment, intended mainly for agricultural or agro-food industries.

La présente invention est en particulier destinée à s'appliquer dans les séchoirs à grains.The present invention is particularly intended to apply in grain dryers.

L'invention concerne plus particulièrement un procédé et un dispositif de filtration de l'air permettant le recyclage du flux d'air qui circule dans un séchoir à grains.The invention more particularly relates to a method and an air filtration device for recycling the flow of air flowing in a grain dryer.

Un séchoir à grains permet, après la récolte de ces derniers, leur séchage. En effet, lorsque lesdits grains sont récoltés sur le pied de la plante, ils n'ont pas eu le temps de sécher suffisamment. La présence d'une humidité résiduelle au sein des grains peut s'avérer problématique au moment du stockage desdits grains, en favorisant notamment une fermentation et une oxydation de ces derniers. De ce fait, l'utilisation d'un séchoir à grains, postérieurement à la récolte, est indispensable pour pouvoir entreposer les grains dans des conditions optimales et pour éviter toute dégradation de ces derniers.A grain dryer allows, after the harvest of the latter, their drying. Indeed, when said grains are harvested on the base of the plant, they have not had time to dry sufficiently. The presence of residual moisture in the grains may be problematic at the time of storage of said grains, including promoting fermentation and oxidation thereof. Therefore, the use of a grain dryer, after harvest, is essential to store grain in optimal conditions and to prevent degradation of the latter.

Traditionnellement, un séchoir à grains destiné à ce type d'application est constitué d'au moins une colonne, dans lesquelles les grains peuvent circuler notamment par la gravité. Les grains sont déposés en vrac au niveau de la partie supérieure de la colonne et ressortent secs en partie inférieure.Traditionally, a grain dryer intended for this type of application consists of at least one column, in which the grains can circulate in particular by gravity. The grains are deposited in bulk at the top of the column and come out dry in the lower part.

Au cours de leur trajet au sein de la ou des colonnes de séchage, les grains sont en contact avec de l'air présentant une température plus ou moins importante, l'air circulant dans les colonnes du séchoir étant traditionnellement recyclé.During their journey within the drying column or columns, the grains are in contact with air having a greater or lesser temperature, the air circulating in the columns of the dryer being traditionally recycled.

Le recyclage de l'air dans les séchoirs à grains traditionnels est généralement permis par la mise en place d'au moins un filtre, par exemple des « filtres manche », souvent utilisés dans les milieux industriels.Recycling air in traditional grain dryers is generally allowed by the installation of at least one filter, for example "bag filters", often used in industrial settings.

Plus particulièrement, les filtres manche, pouvant être disposés soit horizontalement, soit verticalement, permettent une séparation des poussières transportées par une veine d'air et collectées dans un conduit.More particularly, the sleeve filters, which can be arranged either horizontally or vertically, allow a separation of the dust transported by a stream of air and collected in a conduit.

Les documents de brevet RU 2191061 , JP 2000001224 et JP 11124232 décrivent notamment l'utilisation de filtres à manche pour piéger les poussières au moment du recyclage de l'air circulant dans un séchoir à grains.Patent documents RU 2191061 , JP 2000001224 and JP 11124232 describe in particular the use of bag filters for trapping dust at the time of recycling the air circulating in a grain dryer.

Les filtres manche présentent l'avantage de permettre une séparation performante des poussières ; cependant, lesdits filtres qui équipent les séchoirs à grains doivent régulièrement subir des opérations de décolmatage.Handle filters have the advantage of allowing efficient separation of dust; however, said filters that equip the grain dryers must regularly undergo unclogging operations.

En conséquence, un séchoir à grains comportant un filtre manche doit être arrêté en moyenne une fois toutes les semaines, et ce afin notamment de nettoyer ces filtres qui sont colmatés par les poussières. Cette opération fastidieuse et couteuse en temps est cependant nécessaire ; en effet, la présence d'un filtre manche colmaté risque d'une part de réduire significativement les performances du séchoir à grains et d'autre part d'entrainer une augmentation de la consommation énergétique du séchoir.Consequently, a grain dryer comprising a sleeve filter must be stopped on average once every week, in particular in order to clean those filters which are clogged with dust. This tedious and time-consuming operation is however necessary; indeed, the presence of a clogged sleeve filter may on the one hand significantly reduce the performance of the grain dryer and on the other hand to cause an increase in energy consumption of the dryer.

En ce qui concerne plus particulièrement, le document de brevet JP 2000 001224 , celui-ci propose un dispositif dans lequel des grains ou poudres sont déversés au travers d'un conduit depuis un container. Au niveau du conduit est positionnée une enveloppe, laquelle est équipée d'un port de remplacement de l'air. Au niveau de ce port, un filtre est positionné, dont la partie externe est couverte avec un capuchon connecté à un collecteur de poussière. Un dégagement est ménagé entre ledit capuchon et le filtre, de sorte à permettre une arrivée de l'air provenant de l'extérieur du dispositif.In particular, the patent document JP 2000 001224 , it proposes a device in which grains or powders are discharged through a conduit from a container. At the level of the duct is positioned an envelope, which is equipped with an air replacement port. At this port, a filter is positioned, the outer part of which is covered with a cap connected to a dust collector. A clearance is provided between said cap and the filter, so as to allow an inflow of air from outside the device.

Toutefois, ce dispositif présente un certain nombre d'inconvénients, et en particulier, il ne permet pas un séchage actif, par un flux d'air, du produit qui circule au travers du conduit, et, de ce fait, une recirculation et un recyclage du flux d'air n'est pas prévu.However, this device has a certain number of drawbacks, and in particular, it does not allow active drying, by an air flow, of the product which circulates through the duct, and, as a result, recirculation and recirculation of the airflow is not planned.

En outre, les inconvénients des filtres manche, mentionnés plus haut, sont également retrouvés dans ce dispositif.In addition, the disadvantages of sleeve filters, mentioned above, are also found in this device.

D'autres types de filtres sont décrits dans l'état de la technique, par exemple dans les documents US 4 563 200 et US 4 690 700 . Toutefois, ces filtres ne sont en aucun cas adaptés à des séchoirs à grains.Other types of filters are described in the state of the art, for example in documents US 4,563,200 and US 4,690,700 . However, these filters are in no way suitable for grain dryers.

L'invention offre la possibilité de pallier les divers inconvénients de l'état de la technique en proposant un procédé et un dispositif, pour la filtration de l'air circulant dans un séchoir, ne nécessitant pas un arrêt hebdomadaire du séchoir à grains pour procéder à un décolmatage du filtre.The invention offers the possibility of overcoming the various drawbacks of the state of the art by proposing a method and a device for filtering the air circulating in a dryer, not requiring a weekly shutdown of the grain dryer to proceed. unclogging the filter.

A cet effet, la présente invention concerne un procédé de filtration d'un flux d'air dans un séchoir à grains, permettant le recyclage de l'air, dans lequel :

  • on fait entrer un flux d'air extérieur dans ledit séchoir à grains ;
  • on déverse par gravité un flux de grains dans ledit séchoir à grains ;
  • on fait passer ledit flux d'air au travers du flux de grains selon une direction sensiblement perpendiculaire à la direction du flux de grains ;
  • on filtre le flux d'air, une fois que celui-ci est passé au travers des grains, de manière à retenir les particules présentes dans le flux d'air;
  • on réchauffe le flux filtré et on le dirige en amont du flux de grains de manière à ce que ledit flux filtré retraverse les grains ;
  • on souffle les particules issues de la filtration.
To this end, the present invention relates to a method of filtering an air flow in a grain dryer, allowing the recycling of air, in which:
  • an outside air flow is introduced into said grain dryer;
  • a grain flow is poured by gravity into said grain dryer;
  • said flow of air is passed through the stream of grains in a direction substantially perpendicular to the direction of grain flow;
  • filtering the air flow, once it has passed through the grains, so as to retain the particles present in the air flow;
  • the filtered stream is heated and is directed upstream of the stream of grains so that said filtered stream crosses the grains;
  • we blow the particles from the filtration.

De façon préférentielle, on filtre le flux d'air une seconde fois, après que celui-ci ait retraversé le flux de grains, les particules issues de la seconde filtration étant ensuite soufflées.Preferably, the air flow is filtered a second time, after it has returned to the flow of grains, the particles from the second filtration being then blown.

La présente invention concerne également un dispositif pour la mise en oeuvre du procédé selon l'invention consistant en un séchoir à grains comportant une colonne de séchage verticale, permettant le passage d'un flux de grains pour le séchage et le refroidissement de ces derniers par une circulation d'un flux d'air sensiblement perpendiculaire à la direction de passage du flux de grains, ledit dispositif étant caractérisé en ce qu'il comporte au moins un moyen de filtration permettant la filtration du flux d'air sortant de ladite colonne et la rétention de particules présentes dans ledit flux d'air, ledit dispositif comportant encore au moins un moyen mobile de soufflage d'air associé au moyen de filtration, permettant un soufflage des particules issues de la filtration, ledit moyen de soufflage étant approvisionné en air par au moins un moyen d'alimentation en air.The present invention also relates to a device for implementing the method according to the invention consisting of a grain dryer comprising a vertical drying column, allowing the passage of a stream of grains for drying and drying. cooling them by a circulation of an air flow substantially perpendicular to the flow direction of the flow of grains, said device being characterized in that it comprises at least one filtration means for filtering the air flow leaving said column and the retention of particles present in said air flow, said device further comprising at least one mobile air blowing means associated with the filtration means, allowing blowing of the particles resulting from the filtration, said means of blowing being supplied with air by at least one means for supplying air.

De manière avantageuse, le moyen de filtration consiste en au moins un filtre plat, ce dernier comprenant au moins un niveau de filtration, et s'étendant sur au moins une partie de la hauteur de ladite colonne de séchage verticale du séchoir à grains.Advantageously, the filtration means consists of at least one flat filter, the latter comprising at least one filtration level, and extending over at least a portion of the height of said vertical drying column of the grain dryer.

Préférentiellement, ledit filtre plat comporte deux niveaux de filtration, chacun des niveaux de filtration consistant en une plaque filtrante.Preferably, said flat filter has two levels of filtration, each of the filtration levels consisting of a filter plate.

Avantageusement, ledit filtre plat est contenu dans un plan.Advantageously, said flat filter is contained in a plane.

Selon un autre mode de réalisation, ledit filtre plat comporte deux pans, chacun de ces pans étant contenu dans deux plans différents.According to another embodiment, said flat filter comprises two sections, each of these sections being contained in two different planes.

De manière intéressante, le moyen d'alimentation en air du moyen de soufflage consiste en un ventilateur, disposé en partie inférieure du séchoir à grains, et/ou en un ventilateur embarqué associé au moyen de soufflage.Interestingly, the air supply means of the blowing means consists of a fan disposed in the lower part of the grain dryer, and / or an onboard fan associated with the blowing means.

Selon une autre particularité de l'invention, le moyen de soufflage mobile consiste en une buse de soufflage, cette dernière étant disposée du coté du moyen de filtration opposé à celui où se trouve la colonne de séchage, ladite buse de soufflage présentant sensiblement la même largeur que ledit moyen de filtration et comportant au moins des moyens de captage de l'air.According to another particularity of the invention, the mobile blowing means consists of a blowing nozzle, the latter being disposed on the side of the filtration means opposite to that in which the drying column is located, said blowing nozzle having substantially the same width that said filtering means and having at least air sensing means.

Avantageusement, le dispositif comporte encore des moyens de convoyage permettant un déplacement du moyen de soufflage le long dudit moyen de filtration.Advantageously, the device also comprises conveying means for moving the blowing means along said filtering means.

La présente invention comporte de nombreux avantages. D'une part, le procédé et le dispositif selon l'invention permettent un séchage des grains. De plus, un recyclage de la totalité de l'air circulant dans la partie inférieure du séchoir est effectué; en effet, le flux d'air, entrant dans le séchoir à grains, et passant à travers le flux de grains, est par la suite entièrement filtré avant de passer en partie supérieure dudit séchoir où ledit flux d'air est chauffé puis repasse au travers du flux des grains. Il n'est alors pas nécessaire de faire à nouveau entrer un flux d'air externe devant être chauffé et mélangé à un air interne partiellement recyclé ; cela permet notamment d'éviter le risque d'incendie au sein du séchoir. L'air traversant les grains en partie supérieure du séchoir est également préférentiellement recyclé.The present invention has many advantages. On the one hand, the method and the device according to the invention allow drying of the grains. In addition, a recycling of all the air circulating in the lower part of the dryer is carried out; in fact, the flow of air, entering the grain dryer, and passing through the flow of grains, is then completely filtered before passing to the upper part of said dryer where said air flow is heated then back to the through the grain flow. There is no need to re-enter an external air stream to be heated and mixed with partially recycled internal air; this helps to avoid the risk of fire in the dryer. The air passing through the grains in the upper part of the dryer is also preferably recycled.

D'autre part, le procédé et le dispositif selon l'invention permettent d'éviter que le moyen de filtration, consistant préférentiellement en un filtre plat, ne se colmate, du fait de la présence de poussières ; en effet, l'étape de soufflage au moyen notamment d'au moins une buse de soufflage entraine un nettoyage performant, automatique et en continu de l'ensemble du moyen de filtration.On the other hand, the method and the device according to the invention make it possible to prevent the filtration means, preferably consisting of a flat filter, from clogging due to the presence of dust; indeed, the blowing step by means in particular of at least one blowing nozzle results in efficient cleaning, automatic and continuous all of the filtration means.

En conséquence, l'utilisateur du présent dispositif n'est plus obligé d'entretenir fréquemment le moyen de filtration du séchoir à grains sous peine de voir augmenter la consommation énergétique de son séchoir. L'invention présente donc un atout économique indéniable et permet un gain de temps sur l'entretien des séchoirs à grains.Consequently, the user of the present device is no longer obliged to frequently maintain the filtering means of the grain dryer, otherwise the energy consumption of his dryer will increase. The invention therefore has an undeniable economic advantage and saves time on the maintenance of grain dryers.

D'autres caractéristiques et avantages de l'invention ressortiront de la description détaillée qui va suivre des modes de réalisation non limitatifs de l'invention, en référence aux figures annexées dans lesquelles :

  • la figure 1 illustre schématiquement une vue en coupe transversale d'un mode de réalisation particulier du dispositif selon l'invention, dans lequel un séchoir à grains comporte un moyen de filtration qui consiste en un filtre plat ;
  • la figure 2 représente schématiquement une vue de trois quart du dessus de la buse de soufflage permettant de décolmater le filtre plat disposé dans un séchoir à grains.
Other characteristics and advantages of the invention will emerge from the following detailed description of non-limiting embodiments of the invention, with reference to the appended figures in which:
  • the figure 1 schematically illustrates a cross-sectional view of an embodiment particular device according to the invention, wherein a grain dryer comprises a filter means which consists of a flat filter;
  • the figure 2 schematically shows a three-quarter view of the top of the blast nozzle for unclogging the flat filter disposed in a grain dryer.

La présente invention est relative à un procédé de filtration d'un flux d'air dans un séchoir à grains 1, ledit procédé selon l'invention permettant avantageusement un recyclage optimal de totalité du flux d'air utilisé dans ledit séchoir à grains 1.The present invention relates to a method for filtering an air flow in a grain dryer 1, said method according to the invention advantageously allowing optimum recycling of all the air flow used in said grain dryer 1.

Le procédé selon la présente invention permet en outre un séchage des grains avec ledit flux d'air.The method according to the present invention further allows grain drying with said air flow.

Le flux d'air circulant dans le séchoir à grains 1 est symbolisé, sur la figure 1 annexée, par les flèches pleines.The flow of air flowing in the grain dryer 1 is symbolized on the figure 1 annexed, by the arrows full.

Dans une première étape du procédé, on fait entrer un flux d'air extérieur dans le séchoir à grains 1. L'entrée du flux d'air peut notamment être effectuée par l'intermédiaire d'un orifice d'entrée 2, ce dernier étant préférentiellement situé en partie basse, ou inférieure, dudit séchoir à grains 1.In a first step of the method, an external air flow is introduced into the grain dryer 1. The inlet of the air flow may in particular be effected via an inlet orifice 2, the latter preferably being located in the lower part, or lower, of said grain dryer 1.

On déverse alors, dans le séchoir à grains 1, un flux de grains par gravité.A grain stream is then discharged into the grain dryer 1 by gravity.

Avantageusement, ce flux de grains est déversé à l'intérieur d'une colonne de séchage verticale 3 située dans ledit séchoir 1. Dans cette colonne 3 on fait transiter des grains au travers d'une pluralité de zones de séchage et de refroidissement 31 à 34 de manière à permettre un séchage optimal de ces derniers.Advantageously, this stream of grains is poured inside a vertical drying column 3 situated in said dryer 1. In this column 3, grains are passed through a plurality of drying and cooling zones 31 to 34 so as to allow optimum drying of the latter.

Au travers du flux de grains déversé dans ledit séchoir 1, on fait passer le flux d'air, selon une direction sensiblement perpendiculaire à la direction du flux de grains.Through the flow of grains poured into said dryer 1, the flow of air is passed in a direction substantially perpendicular to the direction of grain flow.

En particulier, le flux d'air externe que l'on a fait entrer dans le séchoir à grains 1 traverse dans un premier temps le flux des grains au niveau d'une zone de séchage inférieure 33 et d'une zone de refroidissement 34 de la colonne de séchage 3.In particular, the external air flow that has been introduced into the grain dryer 1 passes firstly through the flow of grains at a lower drying zone 33 and a cooling zone 34. the drying column 3.

Préférentiellement, on peut réchauffer ledit flux d'air externe avant que celui-ci ne passe au travers du flux des grains notamment dans la zone de séchage inférieure 33. Une telle opération peut notamment être effectuée par l'intermédiaire d'un moyen de chauffage 6 visible sur la figure 1 annexée.Preferably, it is possible to heat said external air flow before it passes through the grain flow, especially in the lower drying zone 33. Such an operation can in particular be carried out via a heating means 6 visible on the figure 1 attached.

Après être passé au travers des grains, pour sécher ces derniers, le flux d'air est filtré. Cette opération permet avantageusement de retenir les particules ou poussières recueillies par le flux d'air lors de son passage au travers du flux de grains.After passing through the grains, to dry them, the air flow is filtered. This operation advantageously makes it possible to retain the particles or dust collected by the flow of air during its passage through the flow of grains.

Ainsi, suite à l'étape de filtration, on obtient un flux d'air totalement exempt des impuretés présentant un diamètre supérieur au maillage du moyen filtrant utilisé, et ledit flux d'air va pouvoir ensuite être réutilisé. Le flux d'air filtré est ensuite préférentiellement réchauffé puis dirigé en amont du flux de grains. On fait alors repasser le flux d'air, après filtration, au travers du flux des grains.Thus, following the filtration step, there is obtained an air flow completely free of impurities having a diameter greater than the mesh of the filtering means used, and said air flow can then be reused. The stream of filtered air is then preferentially heated and then directed upstream of the flow of grains. The air stream is then passed through, after filtration, through the flow of grains.

En d'autres termes, le flux d'air passe dans un premier temps au travers du flux des grains en partie inférieure du séchoir à grains 1, au niveau des zones inférieures référencées 33 et 34, éventuellement après avoir été réchauffé. Après avoir filtré le flux d'air en sortie du flux de grains, l'air est à nouveau préférentiellement chauffé et dirigé en partie supérieure dudit séchoir 1 où il va traverser le flux des grains à nouveau, au niveau des zones de séchages supérieures 31 et 32, situées en amont des zones 33 et 34, par rapport au flux de grains.In other words, the flow of air passes initially through the flow of grains in the lower part of the grain dryer 1, at the lower zones referenced 33 and 34, possibly after being heated. After having filtered the flow of air at the outlet of the flow of grains, the air is again preferentially heated and directed to the upper part of said dryer 1 where it will pass through the flow of the grains again, at the level of the upper drying zones 31 and 32, located upstream of the zones 33 and 34, with respect to the flow of grains.

Pour terminer le procédé selon l'invention, et selon une étape essentielle de ce procédé, on souffle les particules issues de la filtration, de manière à éliminer ces dernières et permettre la réalisation d'un nouveau cycle de filtration d'un flux d'air.To complete the process according to the invention, and according to an essential step of this process, particles are blown out from the filtration, so as to eliminate them and allow the realization of a new filtration cycle of a flow of air.

Cette dernière étape de soufflage, qui suit l'étape de filtration, permet d'éviter d'avoir à stopper les cycles de séchage pour décolmater les moyens servant à la filtration du flux d'air. Le gain de temps, rendu possible par la mise en oeuvre du procédé selon la présente invention, est donc non négligeable.This last blowing step, which follows the filtration step, makes it possible to avoid having to stop the drying cycles in order to unclog the means used for filtering the product. air flow. The saving of time, made possible by the implementation of the method according to the present invention, is therefore not negligible.

Les particules, une fois soufflées, descendent ensuite le long du moyen ayant servi à la filtration et atteignent un système de récupération, situé en partie inférieure dudit moyen de filtration, permettant l'évacuation de ces particules.The particles, once blown, then descend along the means used for filtration and reach a recovery system, located in the lower part of said filtering means, allowing the evacuation of these particles.

Après que le flux d'air recyclé ait traversé une seconde fois le flux de grains, il peut à nouveau subir une étape de filtration, laquelle peut être suivie d'une étape de soufflage des particules.After the stream of recycled air has passed through the flow of grain a second time, it can again undergo a filtration step, which can be followed by a step of blowing the particles.

Le flux d'air, qui peut être filtré une seconde fois, peut alors être évacué vers l'extérieur du séchoir 1.The flow of air, which can be filtered a second time, can then be discharged to the outside of the dryer 1.

La présente invention concerne encore un dispositif pour la mise en oeuvre du procédé décrit précédemment.The present invention also relates to a device for implementing the method described above.

Plus particulièrement, le dispositif pour la mise en oeuvre du procédé selon l'invention consiste en un séchoir à grains 1. Celui-ci comporte notamment une colonne de séchage verticale 3 dans laquelle passe un flux de grains, permettant ainsi de sécher puis de refroidir les grains. Pour ce faire, ladite colonne verticale 3 comporte préférentiellement une pluralité de zones de séchage et une zone de refroidissement des grains, par exemple quatre zones, référencées 31 à 34 sur la figure ci-jointe. Plus particulièrement, les zones 31 à 33 consistent en des zones de séchage et la zone 34 en une zone de refroidissement. Le séchage et le refroidissement des grains est permis, dans les zones 31 à 34 de la colonne 3, par le passage d'un flux d'air, selon une direction sensiblement perpendiculaire à la direction de circulation du flux de grains au sein de la colonne verticale 3.More particularly, the device for carrying out the process according to the invention consists of a grain dryer 1. This comprises in particular a vertical drying column 3 through which a stream of grains passes, thus allowing drying and then cooling the grains. To do this, said vertical column 3 preferably comprises a plurality of drying zones and a grain cooling zone, for example four zones, referenced 31 to 34 in the attached figure. More particularly, zones 31 to 33 consist of drying zones and zone 34 a cooling zone. The drying and cooling of the grains is allowed, in the zones 31 to 34 of the column 3, by the passage of an air flow, in a direction substantially perpendicular to the flow direction of the flow of grains within the vertical column 3.

Selon une caractéristique essentielle, le dispositif selon l'invention comporte également au moins un moyen de filtration, destiné à filtrer le flux d'air sortant de la colonne verticale 3 après que ledit flux d'air soit passé au travers du flux des grains pour sécher ces derniers, notamment au niveau des zones inférieures de séchage 33 et de refroidissement 34. Ledit moyen de filtration permet avantageusement une rétention des particules et/ou des poussières entrainées par le flux d'air au moment du passage de ce dernier à travers les grains.According to an essential characteristic, the device according to the invention also comprises at least one filtration means, intended to filter the flow of air leaving the vertical column 3 after said air flow has passed through the flow of grains to drying these, especially at the lower zones of drying 33 and cooling 34. Said filtration means advantageously allows a retention of particles and / or dust entrained by the air flow at the time of the passage of the latter through the grains.

Le dispositif peut encore comporter un second moyen de filtration, pour filtrer notamment le flux d'air sortant des zones de séchages supérieures 31 et 32.The device may also comprise a second filtering means, in particular for filtering the flow of air leaving the upper drying zones 31 and 32.

Selon un mode de réalisation particulièrement avantageux du dispositif selon l'invention, le moyen de filtration consiste en un filtre plat 4, visible sur la figure 1.According to a particularly advantageous embodiment of the device according to the invention, the filtration means consists of a flat filter 4, visible on the figure 1 .

Préférentiellement, ledit filtre plat 4 peut être contenu dans un seul plan. Cependant, un tel mode de réalisation n'est pas limitatif de l'invention, et il est également envisageable que ledit filtre plat 4 comporte plusieurs pans, par exemple deux pans ; en d'autres termes, le filtre plat 4 peut être contenu dans plusieurs plans, par exemple deux plans, de sorte à augmenter la surface de filtration.Preferably, said flat filter 4 may be contained in a single plane. However, such an embodiment is not limiting of the invention, and it is also conceivable that said flat filter 4 has several sides, for example two sides; in other words, the flat filter 4 may be contained in several planes, for example two planes, so as to increase the filtration area.

Le filtre plat 4 peut également, selon un mode de réalisation préférentiel, comporter, par exemple, un niveau de filtration, pouvant consister en une plaque filtrante, ou alors une pluralité de niveaux de filtration sensiblement parallèles, par exemple deux niveaux de filtration, ces derniers pouvant soit présenter un maillage identique, soit un maillage différent. Dans ce cas particulier, le maillage du premier niveau de filtration permet la rétention d'impuretés présentant une certaine taille et le maillage du second niveau de filtration, traversé par le flux d'air après un passage dans le premier niveau de filtration, permet la rétention d'impuretés présentant une taille inférieure à celle retenues par ledit premier niveau de filtration.The flat filter 4 may also, according to a preferred embodiment, comprise, for example, a filtration level, which may consist of a filter plate, or else a plurality of substantially parallel filtration levels, for example two filtration levels, these the last ones can have either an identical mesh, or a different mesh. In this particular case, the mesh of the first level of filtration allows the retention of impurities having a certain size and the mesh of the second level of filtration, crossed by the air flow after a passage in the first level of filtration, allows the retention of impurities having a size smaller than that retained by said first level of filtration.

Cela permet, de façon toute particulièrement intéressante, d'améliorer les capacités de rétention du filtre plat 4 que comporte le dispositif selon l'invention.This makes it particularly interesting to improve the retention capabilities of the flat filter 4 that comprises the device according to the invention.

De façon intéressante, ledit filtre plat 4 s'étend parallèlement à la colonne de séchage verticale 3 et sur au moins une partie de la hauteur de ladite colonne 3.Interestingly, said flat filter 4 extends parallel to the vertical drying column 3 and over at least a portion of the height of said column 3.

Plus préférentiellement encore, le filtre plat 4 s'étend sur la partie de la colonne de séchage 4 correspondant aux zones inférieures de séchage 33 et de refroidissement 34. En effet, c'est le flux d'air transitant dans ces zones inférieures 33 et 34 qui est préférentiellement recyclé par un passage au travers du moyen de filtration, notamment un filtre plat 4, ledit flux d'air recyclé pouvant ensuite être utilisé dans les zones de séchage supérieures 31 et 32.Even more preferentially, the flat filter 4 extends over the part of the drying column 4 corresponding to the lower drying and cooling zones 34. Indeed, it is the flow of air passing through these lower zones 33 and 34 which is preferably recycled through a passage through the filtration means, in particular a flat filter 4, said recycled air stream can then be used in the upper drying zones 31 and 32.

Le dispositif peut également comporter une pluralité de filtres plats, par exemple 4 et 41, chacun comportant au moins un niveau de filtration, chacun de ces niveaux de filtration pouvant préférentiellement consister en une plaque de filtration.The device may also comprise a plurality of flat filters, for example 4 and 41, each having at least one level of filtration, each of these filtration levels may preferably consist of a filter plate.

Le mode de réalisation dans lequel ledit dispositif comporte deux filtres 4 et 41 est représenté sur la figure 1 et, dans ce cas, le filtre plat 41 permet une filtration du flux d'air après passage de celui-ci au niveau de la partie supérieure de la colonne 3, qui correspond plus particulièrement aux zones de séchage 31 et 32.The embodiment in which said device comprises two filters 4 and 41 is represented on the figure 1 and, in this case, the flat filter 41 allows a filtration of the air flow after passage thereof at the upper part of the column 3, which corresponds more particularly to the drying zones 31 and 32.

A la sortie du filtre plat 4, le flux d'air est donc dépourvu d'impuretés et peut être redirigé vers les zones de séchage supérieures 31 et 32 de la colonne 3 après avoir été chauffé par l'intermédiaire d'au moins un moyen de chauffage, par exemple des bruleurs 61 et 62.At the outlet of the flat filter 4, the air flow is therefore free of impurities and can be redirected to the upper drying zones 31 and 32 of the column 3 after having been heated via at least one means. for heating, for example burners 61 and 62.

Selon une autre caractéristique importante de l'invention, le dispositif comporte encore au moins un moyen mobile de soufflage d'air, celui-ci étant approvisionné en air par au moins un moyen d'alimentation en air.According to another important feature of the invention, the device further comprises at least one mobile air blowing means, the latter being supplied with air by at least one air supply means.

Le moyen mobile de soufflage d'air permet avantageusement un soufflage des particules qui sont piégées dans le moyen de filtration, ce dernier pouvant consister en un filtre plat 4. L'air soufflé par le moyen de soufflage est représenté, sur la figure 1, par les flèches hachurées.The mobile air blowing means advantageously allows blowing of the particles which are trapped in the filtration means, the latter being able to consist of a flat filter 4. The air blown by the blowing means is represented, on the figure 1 , by the hatched arrows.

Dans le cas où le filtre plat 4 comporte plusieurs niveaux de filtration, chacun de ces niveaux est préférentiellement associé à un moyen mobile de soufflage d'air.In the case where the flat filter 4 has several filtration levels, each of these levels is preferably associated with a mobile air blowing means.

En particulier, ce moyen mobile de soufflage d'air peut consister en une buse de soufflage 8 représentée schématiquement sur la figure 2 annexée.In particular, this mobile air blowing means may consist of a blowing nozzle 8 shown schematically on the figure 2 attached.

Avantageusement, ladite buse 8 présente sensiblement la même largeur que le moyen de filtration, par exemple la même largeur que le filtre plat 4, également représenté sur la figure 2. De cette manière, il est possible d'éliminer, en un seul passage avec la buse de soufflage 8, les poussières et particules retenues sur l'ensemble de la largeur du filtre plat 4.Advantageously, said nozzle 8 has substantially the same width as the filtering means, for example the same width as the flat filter 4, also shown in FIG. figure 2 . In this way, it is possible to eliminate, in a single passage with the blast nozzle 8, the dust and particles retained over the entire width of the flat filter 4.

Ladite buse de soufflage 8 est préférentiellement disposée du coté du moyen de filtration qui est opposé au coté où se trouve la colonne de séchage 3. Ainsi, il est possible de souffler de l'air au travers du moyen de filtration, par l'intermédiaire de la buse de soufflage 8, l'air étant soufflé sensiblement parallèlement au flux d'air à recycler et selon une direction opposée. En d'autres termes, l'air soufflé par la buse de soufflage 8 passe au travers du moyen de filtration dans le sens inverse à celui que prend le flux d'air qui passe à travers ce moyen. Cela permet une élimination particulièrement satisfaisante des particules et poussières piégées dans le moyen de filtration, ce dernier consistant préférentiellement en un filtre plat 4.Said blowing nozzle 8 is preferably disposed on the side of the filtering means which is opposite the side where the drying column 3 is located. Thus, it is possible to blow air through the filtration means, via of the blowing nozzle 8, the air being blown substantially parallel to the flow of air to be recycled and in an opposite direction. In other words, the air blown by the blast nozzle 8 passes through the filtration means in the opposite direction to that taken by the flow of air passing through this means. This allows a particularly satisfactory elimination of the particles and dust trapped in the filtration means, the latter preferably consisting of a flat filter 4.

Naturellement, dans le cas où le séchoir 1 comporte une pluralité de moyens de filtration tels que des filtres plats 4, 41, chacun de ces filtres 4, 41 peut être associé à un moyen mobile de soufflage, tel qu'une buse de soufflage 8, de sorte à permettre une élimination optimale des particules retenues au moment du passage du flux d'air dans le filtre 4, 41.Naturally, in the case where the dryer 1 comprises a plurality of filtration means such as flat filters 4, 41, each of these filters 4, 41 may be associated with a mobile blowing means, such as a blowing nozzle 8 , so as to allow optimal removal of the particles retained at the time of passage of the air flow in the filter 4, 41.

De façon toute à fait intéressante, le moyen de soufflage, notamment la buse de soufflage 8, comporte des moyens de captage 9 de l'air, ces moyens 9 pouvant notamment consister en un dispositif de buse à lèvres.In a very interesting way, the blowing means, in particular the blast nozzle 8, comprises means for collecting air 9, these means 9 being able to consist in particular of a lip nozzle device.

Pour revenir à présent au moyen d'alimentation en air du moyen de soufflage, celui-ci peut en particulier consister en un ventilateur 5 et/ou en un ventilateur embarqué, ce dernier n'étant pas représenté sur les figures.To return now to the air supply means of the blowing means, this can in particular consist of a fan 5 and / or an onboard fan, the latter not being shown in the figures.

Plus particulièrement, au niveau du moyen de filtration situé au niveau des zones 33 et 34, c'est-à-dire le filtre plat 4, le moyen d'alimentation en air consiste préférentiellement en un ventilateur 5.More particularly, at the level of the filtration means located at the zones 33 and 34, that is to say the flat filter 4, the air supply means preferably consists of a fan 5.

Ledit ventilateur 5 est préférentiellement disposé en partie inférieure du séchoir à grains 1. Il propulse avantageusement de l'air en surpression dans une colonne 10, cet air propulsé provenant d'une colonne d'air 7 du séchoir 1, dans laquelle l'air est en dépression.Said fan 5 is preferably arranged in the lower part of the grain dryer 1. It advantageously propels air under pressure in a column 10, this propelled air coming from an air column 7 of the dryer 1, in which the air is in depression.

Ainsi, selon un mode de réalisation tout particulier, les moyens de captage de l'air 9 de la buse de soufflage 8 permettent de prélever de l'air qui est envoyé en surpression dans la colonne 10 par le ventilateur 5, alimentant ainsi en air la buse de soufflage 8 pour éliminer les particules piégées dans le filtre plat 4.Thus, according to a very particular embodiment, the air sensing means 9 of the blast nozzle 8 make it possible to take air which is sent under pressure into the column 10 by the fan 5, thus supplying air the blast nozzle 8 to eliminate particles trapped in the flat filter 4.

De préférence, un ventilateur embarqué est associé au moyen de soufflage permettant un décolmatage du filtre plat 41 situé en partie supérieure du séchoir 1, face aux zones 31 et 32 de la colonne 3. Un tel ventilateur embarqué permet d'alimenter en permanence le moyen de soufflage en air.Preferably, an on-board fan is associated with the blowing means for unclogging the flat filter 41 situated in the upper part of the dryer 1, facing the zones 31 and 32 of the column 3. Such an on-board fan makes it possible to supply the medium continuously. air blowing.

Préférentiellement ledit ventilateur embarqué prélève de l'air qui a été filtré pour le renvoyer en surpression au niveau dudit filtre plat 41, par l'intermédiaire d'une buse de soufflage, de sorte à permettre une élimination des impuretés retenues par ledit filtre plat 41.Preferably, said onboard ventilator withdraws air that has been filtered to return it to overpressure at said flat filter 41, via a blowing nozzle, so as to allow removal of the impurities retained by said flat filter 41 .

Selon un exemple de réalisation intéressant, représenté sur la figure 2, le dispositif selon l'invention comporte encore des moyens de convoyage 11 du moyen mobile de soufflage. Plus particulièrement, ces moyens de convoyage 11 permettant notamment un déplacement dudit moyen de soufflage le long du filtre plat 4 par traction depuis le bas vers le haut et par gravité, ou par traction, depuis le haut vers le bas. Ainsi, le déplacement du moyen de soufflage sur toute la hauteur du filtre plat 4 permet un nettoyage intégral de ce dernier par élimination des particules.According to an interesting example of embodiment, represented on the figure 2 , the device according to the invention also comprises conveying means 11 of the mobile blowing means. More particularly, these conveying means 11 allowing in particular a displacement of said blowing means along the flat filter 4 by pulling from the bottom to the top and by gravity, or by pulling, from the top to the bottom. Thus, the displacement of the blowing means over the entire height of the filter Plate 4 allows an integral cleaning of the latter by removing the particles.

Préférentiellement, les moyens de convoyage 11 consistent en un treuil, non représenté sur la figure 2, associé à des moyens de soutien représentés par les câbles visibles sur cette figure.Preferably, the conveying means 11 consist of a winch, not shown on the figure 2 , associated with support means represented by the visible cables in this figure.

Le procédé et le dispositif selon l'invention comportent de nombreux avantages.The method and the device according to the invention have many advantages.

Le principal de ces avantages réside dans le fait que la totalité de l'air utilisé en partie inférieure du séchoir est recyclée pour être réutilisée en partie haute de ce même séchoir. En d'autres termes, il n'est nullement nécessaire, contrairement aux procédés et dispositifs traditionnels, d'insuffler de l'air extérieur et de le mélanger à de l'air recyclé. L'air provenant de l'extérieur présente nécessairement une température inférieure à l'air recyclé ayant déjà circulé au travers de la colonne 3 ; en conséquence, pour être amené à la température adéquate pour le séchage des grains, l'air extérieur oblige à une dépense d'énergie plus importante que l'air recyclé. De ce fait, le procédé et le dispositif selon l'invention permettent une amélioration du rendement du séchage des grains.The main advantage is that all the air used in the lower part of the dryer is recycled for reuse in the upper part of the same dryer. In other words, it is not necessary, unlike traditional methods and devices, to blow outside air and mix it with recycled air. The air coming from the outside necessarily has a temperature lower than the recycled air which has already circulated through the column 3; therefore, to be brought to the proper temperature for the drying of the grains, the outside air requires a greater energy expenditure than the recycled air. As a result, the method and the device according to the invention make it possible to improve the grain drying efficiency.

De plus, une partie de l'air recyclé en partie supérieure du séchoir 1, par l'intermédiaire du filtre plat 41, peut être réutilisée en partie basse dudit séchoir 1, ce qui permet encore une amélioration du rendement.In addition, a part of the air recycled to the upper part of the dryer 1, through the flat filter 41, can be reused in the lower part of said dryer 1, which allows further improvement in efficiency.

Un autre avantage de l'invention, conféré par l'utilisation de filtres plats 4, 41, associées aux buses de soufflage 8, réside dans le fait que l'on évite la mise en place de dispositifs compliqués, couteux et encombrants d'aspiration nécessitant la mise en place d'une tuyauterie, de moteur et d'armoires de commande. Au contraire, le système de soufflage de la présente invention permet une élimination en partie inférieure des poussières et particules retenues dans le filtre plat 4 et soufflées par la buse 8 ; les particules peuvent ensuite être évacuées vers une zone de déchet.Another advantage of the invention, conferred by the use of flat filters 4, 41, associated with the blowing nozzles 8, lies in the fact that it avoids the introduction of complicated, expensive and bulky suction devices. requiring the installation of piping, motor and control cabinets. On the contrary, the blowing system of the present invention allows a removal in the lower part of the dust and particles retained in the flat filter 4 and blown by the nozzle 8; the particles can then be discharged to a waste zone.

Par ailleurs, le système de soufflage mis en place ne nécessite pas d'arrêt du séchage des grains, étant donné que le décolmatage du filtre est effectué de façon continue notamment par la buse de soufflage.Moreover, the blowing system put in place does not require stopping of the drying of the grains, since the unclogging of the filter is carried out continuously, in particular by the blast nozzle.

L'invention n'est pas limitée aux exemples illustrés et décrits précédemment qui peuvent présenter des variantes et modifications sans pour autant sortir du cadre de l'invention.The invention is not limited to the examples illustrated and described above which may have variants and modifications without departing from the scope of the invention.

Claims (10)

Procédé de filtration d'un flux d'air dans un séchoir à grains (1), permettant le recyclage de l'air, dans lequel : - on fait entrer un flux d'air extérieur dans ledit séchoir à grains (1) ; - on déverse par gravité un flux de grains dans ledit séchoir à grains (1) ; - on fait passer ledit flux d'air au travers du flux de grains selon une direction sensiblement perpendiculaire à la direction du flux de grains ; - on filtre le flux d'air, une fois que celui-ci est passé au travers des grains, de manière à retenir les particules présentes dans le flux d'air; - on réchauffe le flux filtré et on le dirige en amont du flux de grains de manière à ce que ledit flux filtré retraverse les grains ; - on souffle les particules issues de la filtration. A method of filtering an air flow in a grain dryer (1), allowing the recycling of air, wherein: an outside air flow is introduced into said grain dryer (1); a flow of grains is poured by gravity into said grain dryer (1); said flow of air is passed through the stream of grains in a direction substantially perpendicular to the direction of the flow of grains; - The air flow is filtered once it has passed through the grains, so as to retain the particles present in the air flow; the filtered stream is heated up and is directed upstream of the stream of grains so that the filtered stream crosses the grains; - The particles from the filtration are blown. Procédé de filtration selon la revendication 1 caractérisé en ce que l'on filtre le flux d'air une seconde fois, après que celui-ci ait retraversé le flux de grains, les particules issues de la seconde filtration étant ensuite soufflées.Filtration process according to claim 1 characterized in that the air flow is filtered a second time after it has returned to the flow of grains, the particles from the second filtration being then blown. Dispositif pour la mise en oeuvre du procédé selon l'une des revendications 1 ou 2 consistant en un séchoir à grains (1) comportant une colonne de séchage verticale (3), permettant le passage d'un flux de grains pour le séchage et le refroidissement de ces derniers par une circulation d'un flux d'air sensiblement perpendiculaire à la direction de passage du flux de grains, ledit dispositif étant caractérisé en ce qu'il comporte au moins un moyen de filtration permettant la filtration du flux d'air sortant de ladite colonne (3) et la rétention de particules présentes dans ledit flux d'air, ledit dispositif comportant encore au moins un moyen mobile de soufflage d'air associé au moyen de filtration, permettant un soufflage des particules issues de la filtration, ledit moyen de soufflage étant approvisionné en air par au moins un moyen d'alimentation en air.Device for carrying out the method according to one of claims 1 or 2 consisting of a grain dryer (1) comprising a vertical drying column (3), allowing the passage of a stream of grains for drying and drying. cooling them by a circulation of an air flow substantially perpendicular to the flow direction of the flow of grains, said device being characterized in that it comprises at least one filtration means for filtering the air flow out of said column (3) and the retention of particles present in said air flow, said device further comprising at least one mobile air blowing means associated with the filtration means, allowing blowing of the particles resulting from the filtration, said blowing means being supplied with air by at least an air supply means. Dispositif selon la revendication 3 caractérisé en ce que le moyen de filtration consiste en au moins un filtre plat (4), ce dernier comprenant au moins un niveau de filtration, et s'étendant sur au moins une partie de la hauteur de ladite colonne de séchage verticale (3) du séchoir à grains (1).Device according to Claim 3, characterized in that the filtering means consists of at least one flat filter (4), the latter comprising at least one filtration level, and extending over at least a portion of the height of the said column. vertical drying (3) of the grain dryer (1). Dispositif selon la revendication 4 caractérisé en ce que ledit filtre plat (4) comporte deux niveaux de filtration, chacun des niveaux de filtration consistant en une plaque filtrante.Device according to claim 4 characterized in that said flat filter (4) has two levels of filtration, each of the filtration levels consisting of a filter plate. Dispositif selon la revendication 4 ou la revendication 5 caractérisé en ce que ledit filtre plat (4) est contenu dans un plan.Device according to claim 4 or claim 5 characterized in that said flat filter (4) is contained in a plane. Dispositif selon la revendication 4 ou la revendication 5 caractérisé en ce que ledit filtre plat (4) comporte deux pans, chacun de ces pans étant contenu dans deux plans différents.Device according to claim 4 or claim 5 characterized in that said flat filter (4) has two sides, each of these sections being contained in two different planes. Dispositif selon l'une quelconque des revendications 3 à 7 caractérisé en ce que le moyen d'alimentation en air du moyen de soufflage consiste en un ventilateur (5), disposé en partie inférieure du séchoir à grains (1), et/ou en un ventilateur embarqué associé au moyen de soufflage.Device according to any one of Claims 3 to 7, characterized in that the means for supplying air to the blowing means consists of a fan (5) arranged in the lower part of the grain dryer (1), and / or an onboard fan associated with the blowing means. Dispositif selon l'une quelconque des revendications 3 à 8 caractérisé en ce que le moyen de soufflage mobile consiste en une buse de soufflage (8), cette dernière étant disposée du coté du moyen de filtration opposé à celui où se trouve la colonne de séchage (3), ladite buse de soufflage (8) présentant sensiblement la même largeur que ledit moyen de filtration et comportant au moins des moyens de captage de l'air.Device according to any one of Claims 3 to 8, characterized in that the mobile blowing means consists of a blowing nozzle (8), the latter being disposed on the side of the filtering means opposite to that in which the drying column (3) is located, said blast nozzle (8) having substantially the same width as said cleaning means; filtration and comprising at least air sensing means. Dispositif selon l'une quelconque des revendications 3 à 9 caractérisé en ce qu'il comporte des moyens de convoyage (11) permettant un déplacement du moyen de soufflage le long dudit moyen de filtration.Device according to any one of claims 3 to 9 characterized in that it comprises conveying means (11) for moving the blowing means along said filtering means.
EP13186307.8A 2012-09-28 2013-09-27 Method for filtering an air stream in a grain dryer Active EP2712497B1 (en)

Applications Claiming Priority (1)

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FR1259202A FR2996105B1 (en) 2012-09-28 2012-09-28 METHOD OF FILTRATION OF AIR FLOW IN A GRAIN DRYER

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EP2712497B1 EP2712497B1 (en) 2015-07-08

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ES (1) ES2548220T3 (en)
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Publication number Priority date Publication date Assignee Title
CN107788113A (en) * 2017-12-12 2018-03-13 江西创迪科技有限公司 A kind of grain drying device

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JP2000001224A (en) 1998-06-12 2000-01-07 Niigata Eng Co Ltd Powder and grain throw-in device
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FR2049941A5 (en) * 1969-06-05 1971-03-26 Donaldson Co Inc
US4690700A (en) 1983-11-07 1987-09-01 Howeth David Franklin Backflushed air filters with quick opening multiple discharge valve
US4563200A (en) 1983-11-08 1986-01-07 Coopers Filters Limited Air filtration
JPH11116062A (en) * 1997-10-09 1999-04-27 Tsukasa Kogyo Kk Powder/grain loading device
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JP2000001224A (en) 1998-06-12 2000-01-07 Niigata Eng Co Ltd Powder and grain throw-in device
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107788113A (en) * 2017-12-12 2018-03-13 江西创迪科技有限公司 A kind of grain drying device

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FR2996105A1 (en) 2014-04-04
ES2548220T3 (en) 2015-10-14
EP2712497B1 (en) 2015-07-08
FR2996105B1 (en) 2014-10-17
HUE027847T2 (en) 2016-11-28

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