EP0036362A1 - Apparatus for the thermal treatment of powdery or granular materials - Google Patents

Apparatus for the thermal treatment of powdery or granular materials Download PDF

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Publication number
EP0036362A1
EP0036362A1 EP81400375A EP81400375A EP0036362A1 EP 0036362 A1 EP0036362 A1 EP 0036362A1 EP 81400375 A EP81400375 A EP 81400375A EP 81400375 A EP81400375 A EP 81400375A EP 0036362 A1 EP0036362 A1 EP 0036362A1
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Prior art keywords
waveguide
sheath
partitions
materials
propeller
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EP81400375A
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German (de)
French (fr)
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EP0036362B1 (en
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Joel Soulier
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material
    • H05B6/784—Arrangements for continuous movement of material wherein the material is moved using a tubular transport line, e.g. screw transport systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
    • 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
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material

Definitions

  • the present invention relates to a new device for the thermal treatment of divided materials and in particular of powdered or granular materials.
  • Heat treatment using microwaves (MO) or ultra high frequency waves (UHF) which are between approximately 300 Megahertz and approximately 30 Gigahertz is currently spreading more and more, thanks in particular to the great availability of this energy. , to its good propagation in various atmospheres, to its good regulation and to its satisfactory enslavement.
  • the homogeneous heating throughout the mass of the treated product which it also provides, has enabled numerous applications of this form of energy, both domestic and industrial applications.
  • Coaxial devices have thus been produced in which the materials to be treated are located inside the waveguide or else devices with transmitting antennas, in which the materials to be treated receive the MO radiation.
  • the object of the present invention is therefore to provide a device which not only makes it possible, on the one hand, to conserve the single-mode waveguide - the most satisfactory device with the highest energy density - but also, d on the other hand, to provide a device which makes it possible to continuously advance the material to be treated at a large, constant and adjustable flow rate, while maintaining it in a maximum field of energy.
  • One of the aims of the present invention is also to be able to use low power energy sources, produced in large series, therefore economically very advantageous.
  • the present invention has for object a device for the thermal treatment of divided materials and in particular of powdered or granular materials, by UHF radiation, characterized in that it comprises in combination: - a waveguide in two parts: a fixed part consisting of a sheath made of metal or a similar conductive material, for seen from metal partitions perpendicular to said sheath, and comprising in the free space between the partitions a lining of non-polar material - and of a mobile part constituted by a helix of conductive material rotating around an axis, or screw Archimedes, whose pitch corresponds exactly to the distance between two successive partitions with which the sheath is provided; - A plurality of magnetrons applied against the outer surface of the sleeve, the distance between two successive magnetrons being a function of the pitch of the propeller and the material to be treated; - Two openings, one for the inlet, the other for the outlet of the material, said openings being dimensioned so that the wave used cannot leave the waveguide.
  • the sheath and the partitions perpendicular to the sheath that is to say the fixed part of the waveguide, represent between 1/4 and 1/2 of the total height of the waveguide.
  • the material to be treated would of course be within the maximum field of action, but the useful volume of the treated material would be reduced; if on the other hand the propeller touched the wall of the sheath, that is to say if one made disappear the fixed partitions perpendicular to the sheath, the volume of treated materials would be maximum, but also the loss of energy, because the current lines of the wall itself would be cut, the optimum effect being, according to the invention, between 1/4 and 1/2 of the total height of the waveguide.
  • the width of the excitation device exceeds the pitch of the propeller.
  • the thickness of the propeller in particular in the vicinity of the fixed part of the waveguide constituted by the partitions, is calculated in such a way that there is never any communication between two excitement guides.
  • This modality of the invention which precisely allows the use of low-power and very cheap commercial magnetrons, makes the device according to the present invention particularly suitable for all heat treatments using large quantities of materials.
  • the thickness of the fixed partitions perpendicular to the sheath is also calculated so that there is no communication between two excitation guides.
  • the device is provided with means for recovering and using the magnetron cooling air to optionally remove water vapor from the treated material.
  • the heat treatment device is pressurized by an inert gas, such as nitrogen for example.
  • the material inlet and outlet openings are square section tubes whose side is at most equal to half the wavelength used for the treatment of the material.
  • the material inlet and outlet openings are tubes of circular section, the diameters of which do not allow the propagation of the wave used for the treatment of the material.
  • the thickness of the sheath lining which is made of non-polar materials such as polyethylene or polystyrene, and is housed between the partitions, represents 1 / 4 to 1/2 of the total height of the waveguide.
  • the sheath is formed of two half-sheaths assembled by two flanges.
  • the edge of the helix facing the partition is bevelled.
  • the present invention relates more particularly to a new device for the heat treatment of large quantities of divided materials, as well as the overall devices and methods in which the devices according to the present invention are included.
  • the partitions 9 facing the turns 10 of the propeller.
  • such a module 7 can measure 600 mm in length. It is provided with two magnetrons 2 and two excitation guides 3 of 70 mm width for example (between two successive magnetrons there are, for example, three propeller pitch 18 of total length of 150 mm) the diameter of the material supply and output tubes is 60 nm for example.
  • the nodule is particularly suitable for 2.45 GHz microwaves (the power of each of the magnetrons is 1 kw).
  • the height 14 of the partitions 9. is 20 mm for example.
  • the material to be treated is located between the turns of the propeller, in the lower part, near the drum axis 13. Knowing the minimum value of the loss factor E "of the material to be treated, as well as its volume , the number of turns between two sources is determined, so that all the energy emitted by one source is absorbed before the energy from the next source arrives.
  • Figure 3 The movable part of this waveguide is shown in Figure 3 (Figure 3a is a longitudinal sectional view and Figure 3b is a cross-sectional view).
  • the total height of the propeller plus drum is 440 mm, the propeller alone measuring 120 mm, which gives a fixed part / for this exemplary embodiment.
  • this module allow the useful filling of 4.8 1, or 90 kg of material per hour.
  • ten of these modules one in the extension of the other after the removal of the flanges 8, one arrives at a treatment of nearly a ton of materials per hour, for an apparatus the total length of which does not exceed 6 m.
  • the sleeve 6 can advantageously be constituted by two half-sleeves 11, assembled by the flanges 15, to facilitate the mounting of these devices.
  • FIG. 4 represents a "section" of the waveguide delimited by the sheath 6, the two fixed partitions 9, the two turns 10, and the surface of the drum axis 13.
  • the material divided during processing 17 is located in the lower part of the Archimedes screw above the gasket 16.
  • the thickness 12 of the turns 10 in the vicinity of the partitions 9, is calculated so that there is never any communication between two excitation guides. (It is 15 mm for the example - nonlimiting - described in the above).
  • the edge 19 of the propeller which faces the partition 9 is cut in a bevel.
  • the width of the excitation device 3 applied against the sheath 6 is such that it exceeds the pitch of the propeller 18, this to avoid the reflection of the wave on the source.
  • the device according to the present invention can, if desired, be pressurized by an inert gas - such as nitrogen for example -. It may also include (not shown in the figures) means for using the cooling air of the magnetrons 2 to remove, if necessary, the water vapor, for example, released from the treated material.
  • an inert gas - such as nitrogen for example -. It may also include (not shown in the figures) means for using the cooling air of the magnetrons 2 to remove, if necessary, the water vapor, for example, released from the treated material.

Abstract

La présente invention est relative à un nouveau dispositif pour le traitement thermique de matières.The present invention relates to a new device for the thermal treatment of materials.

Ce dispositif comporte : - un guide d'ondes (7) en deux parties: une partie fixe constituée par un fourreau (6) en métal pourvu de cloisons métalliques, et une partie mobile constituée par une vis d'Archimède;-une pluralité de magnétrons (2) appliqués contre la surface extérieure du fourreau (6), et deux ouvertures, l'une pour l'entrée (1 l'autre pour la sortie (4) de la matière, lesdites ouvertures étant dimensionnées de manière à ce que l'onde utilisée ne puisse par sortir du guide d'ondes.This device comprises: - a waveguide (7) in two parts: a fixed part constituted by a metal sheath (6) provided with metal partitions, and a movable part constituted by an Archimedes screw; -a plurality of magnetrons (2) applied against the outer surface of the sheath (6), and two openings, one for the inlet (1 the other for the outlet (4) of the material, said openings being dimensioned so that the wave used cannot leave the waveguide.

Application au traitement par rayonnement UHF de la matière divisée.

Figure imgaf001
Application to the treatment by UHF radiation of divided matter.
Figure imgaf001

Description

La présente invention est relative à un nouveau dispositif pour le traitement thermique de matières divisées et notamment de matières en poudre ou en grains.The present invention relates to a new device for the thermal treatment of divided materials and in particular of powdered or granular materials.

Le traitement thermique à l'aide de micro-ondes(M.O.) ou ondes ultra haute fréquence (UHF) qui se situent entre environ 300 Mégahertz et environ 30 Gigahertz se répand actuellement de plus en plus, grâce notamment à la grande disponibilité de cette énergie, à sa bonne propagation dans des atmosphères variées, à sa bonne régulation et à son asservissement satisfaisant. Le chauffage homogène dans toute la masse du produit traité qu'elle procure en outre, a permis de très nombreuses applications de cette forme d'énergie, applications aussi bien domestiques qu'industrielles. Il subsistait, toutefois, un inconvénient important, tout au moins en ce qui concerne les applications industrielles du rayonnement UHF : si le traitement en discontinu des différents produits et matières est dans l'ensemble satisfaisant et ne pose plus de problème importants, il n'en est pas de même pour le traitement en continu d'importantes quantités de matières,et notamment de matières à l'état divisé, telles que grains, poudres ou analogues. En effet, pour que ce traitement thermique de masse soit économiquement rentable, il faut pouvoir traiter des quantités très importantes de matière, et ceci sans déperdition d'énergie et il faut également disposer d'installations robustes et simples. Aucune des installations de l'Art antérieur ne répond à ces exigences de base.Heat treatment using microwaves (MO) or ultra high frequency waves (UHF) which are between approximately 300 Megahertz and approximately 30 Gigahertz is currently spreading more and more, thanks in particular to the great availability of this energy. , to its good propagation in various atmospheres, to its good regulation and to its satisfactory enslavement. The homogeneous heating throughout the mass of the treated product which it also provides, has enabled numerous applications of this form of energy, both domestic and industrial applications. There remained, however, a significant drawback, at least with regard to industrial applications of UHF radiation: if the batch processing of the various products and materials is on the whole satisfactory and no longer poses significant problems, it does not This is not the same for the continuous treatment of large quantities of materials, and in particular of materials in the divided state, such as grains, powders or the like. In fact, for this mass heat treatment to be economically profitable, it is necessary to be able to process very large quantities of material, and this without wasting energy and it is also necessary to have robust and simple installations. None of the prior art installations meet these basic requirements.

Il est exclu d'utiliser des cavités résonnantes multimodes : d'une part il n'y a pas assez de concentration de densité d'énergie, et d'autre part il faudrait construire de très grands volumes, difficiles à réaliser et économiquement non rentables.It is excluded to use multimode resonant cavities: on the one hand there is not enough concentration of energy density, and on the other hand it would be necessary to build very large volumes, difficult to achieve and economically unprofitable .

Il est également économiquement non rentable de prévoir une succession de cavités résonnantes reliées les unes au autresfcomme par exemple la construction d'une enceinte formant un "tunnel" traversant les cavités résonnantes, comme le préconise le Brevet français n° 2 428 369) : il se produit,de plus,des fuites d'énergie importantes,dues au système d'entrée et de sortie de la matière.It is also economically unprofitable to provide a succession of resonant cavities connected to one another (such as, for example, the construction of an enclosure forming a "tunnel" crossing the resonant cavities, as recommended in French Patent No. 2,428,369): in addition, significant energy leaks occur, due to the material entry and exit system.

On a également préconisé l'utilisation de guides d'ondes monomode et multimode utilisant non plus des ondes stationnaires mais des ondes progressives . On a ainsi réalisé des dispositifs coaxiaux dans lesquels les matériaux à traiter se trouvent à l'intérieur du guide d'ondes ou bien encore des dispositifs à antennes émettrices, dans lesquels les matériaux à traiter reçoivent les rayonnements M.O.We also recommended the use of guides single-mode and multimode waves using no longer standing waves but traveling waves. Coaxial devices have thus been produced in which the materials to be treated are located inside the waveguide or else devices with transmitting antennas, in which the materials to be treated receive the MO radiation.

Outre le fait que, dans les dispositifs de l'Art antérieur, le débit des matières à traiter est limité, même avec l'installation de tapis roulants, il se produit, en outre, de grosses pertes d'énergie, car la matière à traiter ainsi convoyée ne se trouve pas dans la zone maximum de concentration d'énergie. De nombreuses-autres tentatives de réalisation d'applicateurs d'énergie M.O. en continu ont été décrits notamment :

  • - par exemple, un dispositif utilisant une vis sans fin (Brevet français 2 337 734)
  • - ou par exemple un dispositif utilisant une plaque tournante (Brevet américain 3 676 058),

et d'autres encore.
liais dans tous les cas, le même handicap subsiste : débit insuffisant, perte en énergie trop élevée, coût d'installation prohibitif.In addition to the fact that, in the devices of the prior art, the flow of the materials to be treated is limited, even with the installation of conveyor belts, there also occurs large losses of energy, because the material to be treated. process thus conveyed is not in the maximum energy concentration zone. Many other attempts to achieve continuous MO energy applicators have been described, in particular:
  • - for example, a device using an endless screw (French patent 2,337,734)
  • - or for example a device using a turntable (American patent 3,676,058),

and even more.
but in any case, the same handicap remains: insufficient flow, too high loss of energy, prohibitive installation cost.

La présente invention s'est par conséquent donné pour but de pourvoir à un dispositif qui non seulement permette de conserver d'une part le guide d'ondes monomode - dispositif le plus satisfaisant à densité d'énergie la plus élevée - mais encore,d'autre part,de pourvoir à un dispositif qui permette de faire avancer d'une manière continue la matière à traiter à un débit important, constant et réglable, tout en la maintenant dans un champ maximum d'énergie. L'un des buts de la présente invention est également de pouvoir utiliser des sources d'énergie de faible puissance, produites en grande série, donc économiquement très intéressantes.The object of the present invention is therefore to provide a device which not only makes it possible, on the one hand, to conserve the single-mode waveguide - the most satisfactory device with the highest energy density - but also, d on the other hand, to provide a device which makes it possible to continuously advance the material to be treated at a large, constant and adjustable flow rate, while maintaining it in a maximum field of energy. One of the aims of the present invention is also to be able to use low power energy sources, produced in large series, therefore economically very advantageous.

La présente invention a pout objet un dispositif pour le traitement thermique de matières divisées et notamment de matières en poudre ou en grains, par rayonnement UHF, caractérisé en ce qu'il comporte en combinaison : - un guide d'ondes en deux parties : une partie fixe constituée par un fourreau en métal ou en un matériau conducteur analogue,pourvu de cloisons métalliques perpendiculaires audit fourreau, et comportant dans l'espace libre entre les cloisons une garniture en matériau non polaire - et d'une.partie mobile constituée par une hélice en matériau conducteur tournant autour d'un axe, ou vis d'Archimède,et dont le pas correspond exactement à la distance qui sépare deux cloisons successives dont est pourvu le fourreau ; - une pluralité de magnétrons appliqués contre la surface extérieure du fourreau, la distance entre deux magnétrons successifs étant fonction du pas de l'hélice et de la matière à traiter ; - deux ouvertures, l'une pour l'entrée, l'autre pour la sortie de la matière, lesdites ouvertures étant dimensionnées de manière à ce que l'onde utilisée ne puisse pas sortir du guide d'ondes.The present invention has for object a device for the thermal treatment of divided materials and in particular of powdered or granular materials, by UHF radiation, characterized in that it comprises in combination: - a waveguide in two parts: a fixed part consisting of a sheath made of metal or a similar conductive material, for seen from metal partitions perpendicular to said sheath, and comprising in the free space between the partitions a lining of non-polar material - and of a mobile part constituted by a helix of conductive material rotating around an axis, or screw Archimedes, whose pitch corresponds exactly to the distance between two successive partitions with which the sheath is provided; - A plurality of magnetrons applied against the outer surface of the sleeve, the distance between two successive magnetrons being a function of the pitch of the propeller and the material to be treated; - Two openings, one for the inlet, the other for the outlet of the material, said openings being dimensioned so that the wave used cannot leave the waveguide.

Conformément à l'invention,le fourreau et les cloisons perpendiculaires au fourreau, c'est-à-dire la partie fixe du guide d'ondes,représentent entre 1/4 et 1/2 de la hauteur totale du guide d'onde.According to the invention, the sheath and the partitions perpendicular to the sheath, that is to say the fixed part of the waveguide, represent between 1/4 and 1/2 of the total height of the waveguide.

En effet, si la partie fixe du guide d'ondes, c'est-à-dire les cloisons et la garniture qui remplissent l'espace entre les cloisons en matériau non polaire, descendait jusqu'à la mi-hauteur du guide d'ondes, la matière à traiter se trouverait bien sûr dans le champ d'action maximum, mais le volume utile de la matière traitée serait diminué ; si par contre l'hélice touchait la paroi du fourreau, c'est-à-dire si on faisait disparaître les cloisons fixes perpendiculaires au fourreau , le volume de matières traitées serait maximum, mais la perte en énergie également, car les lignes de courant de la paroi elle-même seraient coupées, l'effet optimum se situant, conformément à l'invention,entre 1/4 et 1/2 de la hauteur totale du guide d'ondes.Indeed, if the fixed part of the waveguide, that is to say the partitions and the lining which fill the space between the partitions in non-polar material, descended to the mid-height of the guide waves, the material to be treated would of course be within the maximum field of action, but the useful volume of the treated material would be reduced; if on the other hand the propeller touched the wall of the sheath, that is to say if one made disappear the fixed partitions perpendicular to the sheath, the volume of treated materials would be maximum, but also the loss of energy, because the current lines of the wall itself would be cut, the optimum effect being, according to the invention, between 1/4 and 1/2 of the total height of the waveguide.

Selon un mode de réalisation avantageux de l'objet de l'invention et pour éviter la réflexion d'ondes sur la . source, la largeur du dispositif d'excitation dépasse le pas de l'hélice.According to an advantageous embodiment of the object of the invention and to avoid the reflection of waves on the. source, the width of the excitation device exceeds the pitch of the propeller.

Suivant un autre mode de réalisation particulièrement avantageux de l'objet de l'invention, l'épaisseur de l'hélice, en particulier au voisinage de la partie fixe du guide d'ondes constituée par les cloisons , est calculée de telle manière qu'il n'y ait jamais de communication entre deux guides d'excitation.According to another particularly advantageous embodiment of the object of the invention, the thickness of the propeller, in particular in the vicinity of the fixed part of the waveguide constituted by the partitions, is calculated in such a way that there is never any communication between two excitement guides.

Cette modalité de l'invention, qui permet précisément l'utilisation de magnétrons du commerce de faible puissance et très bon marché, rend le dispositif conforme à la présente invention particulièrement adapté à tous les traitements thermiques mettant en oeuvre des quantités importantes de matières.This modality of the invention, which precisely allows the use of low-power and very cheap commercial magnetrons, makes the device according to the present invention particularly suitable for all heat treatments using large quantities of materials.

Suivant un autre mode de réalisation, et pour les mêmes motifs, l'épaisseur des cloisons fixes perpendiculaires au fourreau est calculée également de manière à ce qu'il n'y ait pas de communication entre deux guides d'excitation.According to another embodiment, and for the same reasons, the thickness of the fixed partitions perpendicular to the sheath is also calculated so that there is no communication between two excitation guides.

Conformément à l'invention, le dispositif est pourvu de moyens de récupération et d'utilisation de l'air de refroidissement des magnétrons pour évacuer éventuellement la vapeur d'eau de la matière traitée.According to the invention, the device is provided with means for recovering and using the magnetron cooling air to optionally remove water vapor from the treated material.

Suivant un autre mode de réalisation de l'objet de l'invention, le dispositif de traitement thermique est pressurisé par un gaz inerte, tel que l'azote par exemple.According to another embodiment of the object of the invention, the heat treatment device is pressurized by an inert gas, such as nitrogen for example.

Conformément à l'invention, les ouvertures d'entrée et de sortie des matières sont des tubes de section carrée dont le côté est au plus égal à la moitié de la longueur d'ondes utilisée pour le traitement de la matière.According to the invention, the material inlet and outlet openings are square section tubes whose side is at most equal to half the wavelength used for the treatment of the material.

Selon un autre mode de réalisation de l'objet de l'invention, les ouvertures d'entrée et de sortie de matières sont des tubes de section circulaire, dont les diamètres ne permettent pas l'a propagation de l'onde utilisée pour le traitement de la matière.According to another embodiment of the object of the invention, the material inlet and outlet openings are tubes of circular section, the diameters of which do not allow the propagation of the wave used for the treatment of the material.

Conformément à l'invention, il peut être utile, dans certains cas, notamment lorsqu'on désire augmenter ou diminuer la valeur du champ électrique UHF,.d'avoir une vis d'Archimède à pas variable .In accordance with the invention, it may be useful, in certain cases, in particular when it is desired to increase or decrease the value of the UHF electric field, to have an Archimedes screw with variable pitch.

Comme l'emplacement des cloisons perpendiculaires au fourreau est fonction du pas de 1`hélice, il est évident que dans les cas où l'hélice formant la vis d'Archimède présente un pas variable, la distance entre ces cloisons n'est pas uniforme,mais variable.As the location of the partitions perpendicular to the sheath is a function of the pitch of the helix, it is obvious that in cases where the helix forming the Archimedes screw has a variable pitch, the distance between these partitions is not uniform , but variable.

Selon un autre mode de réalisation avantageux de l'objet de la présente invention, l'épaisseur de la garniture du fourreau, laquelle est en matériaux non polaires tels que le polyéthylène ou le polystyrène, et est logée entre les cloisons, représente de 1/4 à 1/2 de la hauteur totale du guide d'ondes.According to another advantageous embodiment of the object of the present invention, the thickness of the sheath lining, which is made of non-polar materials such as polyethylene or polystyrene, and is housed between the partitions, represents 1 / 4 to 1/2 of the total height of the waveguide.

Conformément à l'invention,le fourreau est formé de deux demi-fourreaux assemblés par deux brides.According to the invention, the sheath is formed of two half-sheaths assembled by two flanges.

Egalement conformément à l'invention, le bord de l'hélice qui fait face à la cloison, est taillé en biseau. E also in accordance with the invention, the edge of the helix facing the partition, is bevelled.

Outre les dispositions qui précèdent, l'invention comprend encore d'autres dispositions,qui ressortiront de la description qui va suivre.In addition to the foregoing provisions, the invention also comprises other provisions, which will emerge from the description which follows.

La présente invention vise plus particulièrement un nouveau dispositif pour le traitement thermique de grandes quantités de matières divisées, ainsi que les dispositifs et procédés d'ensemble dans lesquels sont inclus les dispositifs conformes à la présente invention.The present invention relates more particularly to a new device for the heat treatment of large quantities of divided materials, as well as the overall devices and methods in which the devices according to the present invention are included.

L'invention pourra être mieux comprise à l'aide du complément de description qui va suivre, qui se réfère à un exemple de réalisation du dispositif conforme à la présente invention.The invention can be better understood using the additional description which follows, which refers to an embodiment of the device according to the present invention.

Il doit être bien entendu, toutefois, que cet exemple de réalisation décrit ci-après et représenté aux dessins annexés, est donné uniquement à titre d'illustration de l'objet de l'invention, mais n'en constitue en aucune manière une limitation. Ainsi :

  • - la Figure 1 représente une vue schématique du disposif , vu de l'extérieur
  • - la Figure 2 représente schématiquement la partie fixe du guide d'ondes : la Figure 2a est une vue en coupe longitudinale et la Figure 2b représente une coupe transversale de ce dispositif ;
  • - la Figure 3 représente schématiquement la partie mobile du guide d'ondes : la Figure 3a représente une coupe longitudinale et la Figure 3b une coupe transversale de ce dispositif, et
  • - la Figure 4, représente le guide d'ondes délimité par deux spires successivesde l'hé'lice faisant face à deux cloisons fixées sur le fourreau.
It should be understood, however, that this exemplary embodiment described below and shown in the accompanying drawings, is given solely by way of illustration of the subject of the invention, but does not in any way constitute a limitation thereof. . So :
  • - Figure 1 shows a schematic view of the device, seen from the outside
  • - Figure 2 shows schematically the fixed part of the waveguide: Figure 2a is a longitudinal sectional view and Figure 2b shows a cross section of this device;
  • - Figure 3 shows schematically the movable part of the waveguide: Figure 3a shows a longitudinal section and Figure 3b a cross section of this device, and
  • - Figure 4 shows the waveguide defined by two turns successivesde the hey 'contention facing two walls fixed to the sheath.

Le dispositif conforme à l'invention tel que représenté à la Figure 1, qui comporte un tube 1 d'entrée de la matière divisée, un tube 4 de sortie de la matière traitée, un fourreau 6 (à l'intérieur duquel tourne la vis d'Archimède en- trainée par l'axe d'entrainement 5),des magnétrons 2 et des guides d'excitation 3, constitue en réalité un module 7 qui peut être (en enlèvant la bride 8) accolé à d'autres modules pour constituer, si on le désire, et suivant la quantité de matière que l'on désire traiter, des guides d'ondes plus ou moins longs.The device according to the invention as shown in FIG. 1, which comprises a tube 1 for entering the divided material, a tube 4 for leaving the treated material, a sheath 6 (inside which the screw turns Archimedes entrained by the drive axis 5), magnetrons 2 and excitation guides 3, in reality constitutes a module 7 which can be (by removing the flange 8) attached to other modules for constitute, if desired, and depending on the quantity of material which it is desired to process, more or less waveguides shorter.

La partie fixe de ce module 7 est représentée en détail sur la Figure 2 (Figure 2a = coupe longitudinale et Figure 2b = coupe transversale). On y distingue nettement les cloisons 9 faisant face aux spires 10 de l'hélice. Par exemple, un tel module 7 peut mesurer 600 mm de longueur. Il est pourvu de deux magnétrons 2 et de deux guides d'excitation 3 de 70 mm de largeur par exemple (entre deux magnétrons successifs il y a, par exemple, trois pas d'hélice 18 de longueur totale de 150 mm) le diamètre des tubes d'alimentation et de sortie de la matière est de 60 nm par exemple. Le nodule est particulièrement adapté pour des micro-ondes de 2,45 GHz (la puissance de chacun des magnétrons est de 1 kw). La hauteur 14 des cloisons 9. est de 20 mm par exemple. La matière à traiter se trouve entre les spires 10 de l'hélice, dans la partie basse, près de l'axe-tambour 13. En connaissant la valeur minimum du facteur de pertes E" de la matière à traiter, ainsi que son volume, on détermine le nombre de spires entre deux sources, de manière à ce que toute l'énergie émise par une source soit absorbée avant l'arrivée de l'énergie de la source suivante.The fixed part of this module 7 is shown in detail in Figure 2 (Figure 2a = longitudinal section and Figure 2b = cross section). We can clearly see the partitions 9 facing the turns 10 of the propeller. For example, such a module 7 can measure 600 mm in length. It is provided with two magnetrons 2 and two excitation guides 3 of 70 mm width for example (between two successive magnetrons there are, for example, three propeller pitch 18 of total length of 150 mm) the diameter of the material supply and output tubes is 60 nm for example. The nodule is particularly suitable for 2.45 GHz microwaves (the power of each of the magnetrons is 1 kw). The height 14 of the partitions 9. is 20 mm for example. The material to be treated is located between the turns of the propeller, in the lower part, near the drum axis 13. Knowing the minimum value of the loss factor E "of the material to be treated, as well as its volume , the number of turns between two sources is determined, so that all the energy emitted by one source is absorbed before the energy from the next source arrives.

La partie mobile de ce guide d'ondes est représentée à la Figure 3 (la Figure 3a étant une vue en coupe longitudinale et la Figure 3b une vue en coupe transversale). La hauteur totale hélice plus tambour est de 440 mm, l'hélice seule mesurant 120 mm, ce qui donne un rapport partie fixe/

Figure imgb0001
pour cet exemple de réalisation .The movable part of this waveguide is shown in Figure 3 (Figure 3a is a longitudinal sectional view and Figure 3b is a cross-sectional view). The total height of the propeller plus drum is 440 mm, the propeller alone measuring 120 mm, which gives a fixed part /
Figure imgb0001
 for this exemplary embodiment.

Les dimensions de ce module permettent le-remplissage utile de 4,8 1, ou 90 kg de matière à 1' heure. Autrement dit, en assemblant, par exemple, dix de ces modules l'un dans le prolongement de l'autre après l'enlèvement des brides 8, on arrive à un traitement de près d'une tonne de matières par heure, pour un appareillage dont la longueur totale ne dépasse pas 6 m.The dimensions of this module allow the useful filling of 4.8 1, or 90 kg of material per hour. In other words, by assembling, for example, ten of these modules one in the extension of the other after the removal of the flanges 8, one arrives at a treatment of nearly a ton of materials per hour, for an apparatus the total length of which does not exceed 6 m.

Le fourreau 6 peut avantageusement être constitué par deux demi-fourreaux 11, assemblés par les brides 15, pour faciliter le montage de ces dispositifs.The sleeve 6 can advantageously be constituted by two half-sleeves 11, assembled by the flanges 15, to facilitate the mounting of these devices.

La Figure 4 représente une "section" du guide d'ondes délimitée par le fourreau 6, les deux cloisons fixes 9, les deux spires 10, et la surface de l'axe-tambour 13. Une garniture 16 en matériaux non polaires, par exemple en polystyrène, remplit l'espace entre les deux cloisons 9. La matière divisée en cours de traitement 17 se trouve dans la partie basse de la vis d'Archimède au dessus de la garniture 16.FIG. 4 represents a "section" of the waveguide delimited by the sheath 6, the two fixed partitions 9, the two turns 10, and the surface of the drum axis 13. A lining 16 made of non-polar materials, for example made of polystyrene, fills the space between the two partitions 9. The material divided during processing 17 is located in the lower part of the Archimedes screw above the gasket 16.

L'épaisseur 12 des spires 10 au voisinage des cloisons 9, est calculée de manière à ce qu'il n'y ait jamais de communication entre deux guides d'excitation. (Elle est de 15 mm pour l'exemple - non limitatif - décrit dans ce qui précède).The thickness 12 of the turns 10 in the vicinity of the partitions 9, is calculated so that there is never any communication between two excitation guides. (It is 15 mm for the example - nonlimiting - described in the above).

Le bord 19 de l'hélice qui fait face à la cloison 9, est taillé en biseau.The edge 19 of the propeller which faces the partition 9 is cut in a bevel.

La largeur du dispositif d'excitation 3 appliqué contre le fourreau 6 est telle qu'elle dépasse le pas de l'hélice 18, ceci pour éviter la re- flexion de l'onde sur la source.The width of the excitation device 3 applied against the sheath 6 is such that it exceeds the pitch of the propeller 18, this to avoid the reflection of the wave on the source.

Le dispositif conforme à la présente invention, décrit et représenté sur les dessins, peut, si on le désire, être pressurisé par un gaz inerte -tel que l'azote par exemple-. Il peut également comporter- (non représentés sur les figures) des moyens d'utilisation d'air de refroidissement des magnétrons 2 pour évacuer, si nécessaire, la vapeur d'eau par exemple, dégagée de la matière traitée.The device according to the present invention, described and shown in the drawings, can, if desired, be pressurized by an inert gas - such as nitrogen for example -. It may also include (not shown in the figures) means for using the cooling air of the magnetrons 2 to remove, if necessary, the water vapor, for example, released from the treated material.

Il résulte de la description qui précède, que quels que soient les modes de réalisation et d'application adoptés, l'on obtient un dispositif pour le traitement thermique de matières divisées, à l'aide des micro-ondes, qui présentent,par rapport aux dispositifs visant au même but antérieurement connus, des avantages importants, au nombre desquels on peut citer notamment :

  • - l'avantage de pouvoir traiter de grandes quantités de matières en continu de façon très rentable économiquement, avec une déperdition minimale d'énergie ;
  • - l'avantage de disposer d'installations simples, robustes et faciles à monter et à entretenir ;
  • - l'avantage de pouvoir utiliser des sources d'énergie de faible puissance, produites en grande série ,
  • - et également un avantage non négligeable que procure ce dispositif conforme à la présente invention : du fait de la présence de la vis d'Archimède,la matière,tout en subissant le traitement thermique, est constamment brassée, ce qui assure une homogénéisation parfaite de la matière traitée.
It follows from the above description, that whatever the embodiments and application adopted, there is obtained a device for the thermal treatment of divided materials, using microwaves, which have, relative to devices aimed at the same goal previously known, significant advantages, among which may be mentioned in particular:
  • - the advantage of being able to process large quantities of materials continuously in a very economically profitable manner, with minimal energy loss;
  • - the advantage of having simple, robust installations that are easy to assemble and maintain;
  • - the advantage of being able to use low power energy sources, produced in large series,
  • - And also a non-negligible advantage provided by this device according to the present invention: due to the presence of the Archimedes screw, the material, while undergoing the heat treatment, is constantly stirred, which has on a perfect homogenization of the treated material.

Ainsi que cela ressort de ce qui précède, l'invention ne se limite nullement à ceux de ses modes de mise en oeuvre, de réalisation et d'application qui viennent d'être décrits de façon plus explicite : elle en embrasse au contraire toutes les variantes qui peuvent venir à l'esprit du technicien en la matière, sans s'écarter du cadre, ni de la portée, de la présente invention.As is apparent from the above, the invention is in no way limited to those of its modes of implementation, embodiment and application which have just been described in a more explicit manner: on the contrary, it embraces all of them. variants which may come to the mind of the technician in the field, without departing from the scope, or the scope, of the present invention.

Claims (13)

1°) Dispositif pour le traitement thermique de matières divisées, et notamment de matières en poudre ou en grains, par rayonnement UHF, caractérisé en ce qu'il fonctionne en onde progressive et en ce qu'il comporte en combinaison: - un guide d'ondes en deux parties : une partie fixe constituée par un fourreau (6) en métal ou en un matériau conducteur analogue, pourvu de cloisons métalliques (9) perpendiculaires audit fourreau, et comportant, dans l'espace libre entre les cloisons, une garniture (16) en matériau non polaire - et une partie mobile constituée par une hélice en matériau conducteur tournant autour d'un axe (13), ou vis d'Archimède, et dont le pas (18) correspond exactement à la distance qui sépare deux cloisons (9) successives dont est pourvu le fourreau, la partie mobile du guide d'ondes assurant, en outre, le transport de la matière divisée à traiter ; - une pluralité de magnétrons (2) appliqués contre la surface extérieure du fourreau (6), la distance entre deux magnétrons successifs étant fonction du pas de l'hélice (18) et de la matière à traiter deux ouvertures, l'une pour l'entrée (1), l'autre pour la sortie (4) de la matière, lesdites ouvertures étant dimensionnées de manière à ce que l'onde utilisée ne puisse pas sortir du guide d'ondes. 1) Device for the thermal treatment of divided materials, and in particular of powdered or granular materials, by UHF radiation, characterized in that it operates in progressive wave and in that it comprises in combination: - a waveguide in two parts: a fixed part constituted by a sheath (6) made of metal or a similar conductive material, provided with metal partitions (9) perpendicular to said sheath, and comprising, in the free space between the partitions, a lining (16) of non-polar material - and a movable part constituted by a helix of conductive material rotating around an axis (13), or Archimedes' screw, and whose pitch (18) corresponds exactly to the distance which separates two successive partitions (9) with which the sheath is provided, the movable part of the waveguide further ensuring the transport of the divided material to be treated; - a plurality of magnetrons (2) applied against the outer surface of the sleeve (6), the distance between two successive magnetrons being a function of the pitch of the propeller (18) and of the material to be treated, two openings, one for the 'inlet (1), the other for the outlet (4) of the material, said openings being dimensioned so that the wave used cannot leave the waveguide. 2°) Dispositif selon la Revendication 1, caractérisé en ce que la partie fixe du guide d'ondes représente entre 1/4 et 1/2 de la hauteur totale du guide d'ondes.2 °) Device according to Claim 1, characterized in that the fixed part of the waveguide represents between 1/4 and 1/2 of the total height of the waveguide. 3°) Dispositif selon l'une quelconque des Revendications 1 et 2, caractérisé en ce que la largeur du guide d'excitation (3) dépasse le pas de l'hélice (18).3 °) Device according to any one of Claims 1 and 2, characterized in that the width of the excitation guide (3) exceeds the pitch of the propeller (18). 4°) Dispositif selon l'une quelconque des Revendications 1 à 3, caractérisé en ce que l'épaisseur (12) de l'hélice, en particulier au voisinage de la partie fixe du guide d'ondes constituée par les cloisons (9), est calculée de telle manière qu'il n'y ait jamais de communication entre deux guides d'excitation.4 °) Device according to any one of Claims 1 to 3, characterized in that the thickness (12) of the propeller, in particular in the vicinity of the fixed part of the waveguide constituted by the partitions (9) , is calculated in such a way that there is never any communication between two excitation guides. 5°) Dispositif selon l'une quelconque des Revendications 1 à 3, caractérisé en ce que l'épaisseur des cloisons fixes (9) perpendiculaires au fourreau-(6) est calculée de manière à ce qu'il n'y ait pas de communication entre deux guides d'excitation.5 °) Device according to any one of the Resell cations 1 to 3, characterized in that the thickness of the fixed partitions (9) perpendicular to the sheath (6) is calculated so that there is no communication between two excitation guides. 6°) Dispositif selon l'une quelconque des Revendications 1 à 5, caractérisé en ce que le dispositif est pourvu de moyens de récupération et d'utilisation de l'air de refroidissement des magnétrons (2) pour évacuer éventuellement la vapeur d'eau de la matière traitée (17).6 °) Device according to any one of Claims 1 to 5, characterized in that the device is provided with means for recovering and using the cooling air of the magnetrons (2) to possibly remove the water vapor of the treated material (17). 7°) Dispositif selon l'une quelconque des Revendications 1 à 6, caractérisé en ce que le dispositif de traitement thermique est pressurisé par un gaz inerte.7 °) Device according to any one of Claims 1 to 6, characterized in that the heat treatment device is pressurized by an inert gas. 8°) Dispositif selon l'une quelconque des Revendications 1 à 7, caractérisé en ce que les ouvertures d'entrée et de sortie (1, 4) des matières (17) sont des tubes de section carrée dont le côté est au plus égal à la moitié de la longueur d'ondes utilisée pour le traitement de la matière.8 °) Device according to any one of Claims 1 to 7, characterized in that the inlet and outlet openings (1, 4) of the materials (17) are tubes of square section whose side is at most equal at half the wavelength used for processing the material. 9°) Dispositif selon l'une quelconque des Revendications 1 à 7, caractérisé en ce que les ouvertures d'entrée et de sortie de matières sont des tubes de section circulaire, dont les diamètres ne permettent pas la propagation de l'onde utilisée pour le traitement de la matière.9 °) Device according to any one of Claims 1 to 7, characterized in that the material inlet and outlet openings are tubes of circular section, the diameters of which do not allow the propagation of the wave used for the treatment of matter. 10°) Dispositif selon l'une quelconque des Revendications 1 à 9, caractérisé en ce que la vis d'Archimède est une vis à pas variable.10 °) Device according to any one of Claims 1 to 9, characterized in that the Archimedes screw is a variable pitch screw. 11°) Dispositif selon l'une quelconque des Revendications 1 à 10, caractérisé en ce que l'épaisseur de la garniture (16) du fourreau (6),' réalisée en matériaux non polaires et logée entre les cloisons (9), représente de 1/4 à 1/2 de la hauteur totale du guide d'ondes.11 °) Device according to any one of Claims 1 to 10, characterized in that the thickness of the lining (16) of the sheath (6), 'made of non-polar materials and housed between the partitions (9), represents from 1/4 to 1/2 of the total height of the waveguide. 12°) Dispositif selon l'une quelconque des Revendications 1 à 11, caractérisé en ce que le fourreau est formé de deux demi-fourreaux (11) assemblés par deux brides (15).12 °) Device according to any one of Claims 1 to 11, characterized in that the sheath is formed of two half-sheaths (11) assembled by two flanges (15). 13°) Dispositif selon l'une quelconque des Revendications 1 à 12, caractérisé en ce que le bord (19) de l'hélice qui fait face à la cloison 9, est taillé en biseau.13 °) Device according to any one of Claims 1 to 12, characterized in that the edge (19) of the propeller which faces the partition 9, is cut in a bevel.
EP81400375A 1980-03-13 1981-03-11 Apparatus for the thermal treatment of powdery or granular materials Expired EP0036362B1 (en)

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AT81400375T ATE8091T1 (en) 1980-03-13 1981-03-11 DEVICE FOR THE THERMAL TREATMENT OF POWDERY OR GRANULAR MATERIALS.

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FR8005607 1980-03-13
FR8005607A FR2478418A1 (en) 1980-03-13 1980-03-13 NEW DEVICE FOR THERMALLY TREATING POWDER OR GRAIN MATERIALS

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EP0093474A2 (en) * 1982-04-29 1983-11-09 Clini-Therm Acquisition Corp. Method and apparatus for the conveying and radio frequency processing of dielectric materials
FR2526573A1 (en) * 1982-05-06 1983-11-10 Doryokuro Kakunenryo MICROWAVE HEAT TREATMENT APPARATUS
EP0345020A2 (en) * 1988-05-31 1989-12-06 Kawata Co., Ltd Drying and crystallizing apparatus for granules
EP0535771A1 (en) * 1991-10-04 1993-04-07 Matsui Manufacturing Co., Ltd. Apparatus for drying powdered or granular materials
WO1993009647A1 (en) * 1991-11-05 1993-05-13 Oscar Gossler Kg (Gmbh & Co.) Device for irradiating materials with microwaves
EP0590411A2 (en) * 1992-09-16 1994-04-06 Doryokuro Kakunenryo Kaihatsu Jigyodan Continuous denitration apparatus
NL1006690C2 (en) * 1997-07-30 1999-02-02 Marinus Minkjan Microwave product processing machine
CN102065591A (en) * 2010-11-16 2011-05-18 成都纽曼和瑞微波技术有限公司 High-power combined microwave loop cavity
WO2012045923A1 (en) 2010-10-08 2012-04-12 Innovation & Development Company (Idco) Continuous heat treatment device, in particular for dividing materials, using microwave radiation
FR3046518A1 (en) * 2016-01-06 2017-07-07 Inovfruit MONOMODE MICROWAVE APPLICATOR, DEVICE AND METHOD FOR THERMALLY PROCESSING PRODUCTS
WO2023242489A1 (en) 2022-06-17 2023-12-21 Innovation & Development Company Rotary microwave furnace for the heat treatment of divided materials

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US4826575A (en) * 1985-11-18 1989-05-02 Karamian Narbik A Apparatus for production of high-purity water by microwave technology
US5227598A (en) * 1991-12-23 1993-07-13 General Electric Company In place regeneration of adsorbents using microwaves
CA2454577A1 (en) * 2001-07-20 2003-01-30 American Purification, Inc. Microwave desorber for removing contaminants from resin
WO2005003664A1 (en) * 2003-06-20 2005-01-13 Amut Spa Device and method for heating and/or drying plastic materials
US7498548B2 (en) * 2006-05-02 2009-03-03 Ranger Research, Inc. Microwave heating system and method for removing volatiles from adsorbent materials
GB0725308D0 (en) * 2007-12-28 2008-02-06 Holliday R Combined heater and conveyor
KR100977542B1 (en) * 2008-11-27 2010-08-24 한국전기연구원 Microwave Reactor with Cavity using Coaxial Waveguide and Method thereof
AU2011311838B2 (en) * 2010-10-07 2015-07-30 Milt D. Mathis Microwave rotary kiln
EP2741574B1 (en) * 2011-08-04 2017-03-22 Panasonic Corporation Microwave heating device

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GB1369677A (en) * 1972-02-25 1974-10-09 Rotax Ltd Apparatus for heating a web of a dielectric material
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093474A3 (en) * 1982-04-29 1986-01-22 Clini-Therm Acquisition Corp. Method and apparatus for the conveying and radio frequency processing of dielectric materials
EP0093474A2 (en) * 1982-04-29 1983-11-09 Clini-Therm Acquisition Corp. Method and apparatus for the conveying and radio frequency processing of dielectric materials
FR2526573A1 (en) * 1982-05-06 1983-11-10 Doryokuro Kakunenryo MICROWAVE HEAT TREATMENT APPARATUS
EP0345020A2 (en) * 1988-05-31 1989-12-06 Kawata Co., Ltd Drying and crystallizing apparatus for granules
EP0345020A3 (en) * 1988-05-31 1991-07-03 Kawata Co., Ltd Drying and crystallizing apparatus for granules
EP0535771A1 (en) * 1991-10-04 1993-04-07 Matsui Manufacturing Co., Ltd. Apparatus for drying powdered or granular materials
US5408074A (en) * 1991-11-05 1995-04-18 Oscar Gossler Kg (Gmbh & Co.) Apparatus for the selective control of heating and irradiation of materials in a conveying path
WO1993009647A1 (en) * 1991-11-05 1993-05-13 Oscar Gossler Kg (Gmbh & Co.) Device for irradiating materials with microwaves
US5589140A (en) * 1992-09-16 1996-12-31 Doryokuro Kakunenryo Kaihatsu Jigyodan Continuous denitration apparatus
EP0590411A3 (en) * 1992-09-16 1994-05-25 Doryokuro Kakunenryo Continuous denitration apparatus
EP0590411A2 (en) * 1992-09-16 1994-04-06 Doryokuro Kakunenryo Kaihatsu Jigyodan Continuous denitration apparatus
NL1006690C2 (en) * 1997-07-30 1999-02-02 Marinus Minkjan Microwave product processing machine
WO2012045923A1 (en) 2010-10-08 2012-04-12 Innovation & Development Company (Idco) Continuous heat treatment device, in particular for dividing materials, using microwave radiation
FR2965907A1 (en) * 2010-10-08 2012-04-13 Innovation & Dev Company Idco DEVICE FOR CONTINUOUS THERMAL TREATMENT, IN PARTICULAR DIVERSE MATERIALS, BY MICROWAVE RADIATION
CN102065591A (en) * 2010-11-16 2011-05-18 成都纽曼和瑞微波技术有限公司 High-power combined microwave loop cavity
CN102065591B (en) * 2010-11-16 2012-11-14 成都纽曼和瑞微波技术有限公司 High-power combined microwave loop cavity
FR3046518A1 (en) * 2016-01-06 2017-07-07 Inovfruit MONOMODE MICROWAVE APPLICATOR, DEVICE AND METHOD FOR THERMALLY PROCESSING PRODUCTS
WO2017118821A1 (en) * 2016-01-06 2017-07-13 Inovfruit Single-mode microwave applicator, device and method for thermal treatment of products
US11523476B2 (en) * 2016-01-06 2022-12-06 Inovfruit Single-mode microwave applicator, device and method for thermal treatment of products
WO2023242489A1 (en) 2022-06-17 2023-12-21 Innovation & Development Company Rotary microwave furnace for the heat treatment of divided materials
FR3136840A1 (en) 2022-06-17 2023-12-22 Innovation & Development Company microwave rotary kiln for heat treatment of divided materials

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ATE8091T1 (en) 1984-07-15
FR2478418A1 (en) 1981-09-18
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AR225948A1 (en) 1982-05-14
FR2478418B1 (en) 1983-12-09
JPS56149796A (en) 1981-11-19
BR8101462A (en) 1981-09-15
JPS6271898U (en) 1987-05-08
DE3164268D1 (en) 1984-07-26
EP0036362B1 (en) 1984-06-20
US4406937A (en) 1983-09-27

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