EP0124390B1 - Apparatus for heat-treating of particular material - Google Patents

Apparatus for heat-treating of particular material Download PDF

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Publication number
EP0124390B1
EP0124390B1 EP84400574A EP84400574A EP0124390B1 EP 0124390 B1 EP0124390 B1 EP 0124390B1 EP 84400574 A EP84400574 A EP 84400574A EP 84400574 A EP84400574 A EP 84400574A EP 0124390 B1 EP0124390 B1 EP 0124390B1
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EP
European Patent Office
Prior art keywords
burner
cooler
enclosure
product
products
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Expired
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EP84400574A
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German (de)
French (fr)
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EP0124390A1 (en
Inventor
Lionel Jacques Gilbert Gaurier
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Engie SA
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Gaz de France SA
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Priority to AT84400574T priority Critical patent/ATE27856T1/en
Publication of EP0124390A1 publication Critical patent/EP0124390A1/en
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Publication of EP0124390B1 publication Critical patent/EP0124390B1/en
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    • 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
    • F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • 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
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact

Definitions

  • the present invention relates to an installation for the thermal treatment of divided products which may be solid, liquid or pasty.
  • the object of the present invention is to remedy the above drawbacks by proposing an installation which allows, without limitation, heat treatment at any temperature of all types of divided products, and this with excellent reliability of results and cost. which remains minimal.
  • the subject of the invention is an installation for heat treatment of any divided products and of the type comprising a heating means connected to means for supplying the product to be treated and to a chamber for heat treatment of this product which has a cyclone-shaped lower part from which the product leaves to reach a cooler connected to a source of cold air and the lower part of which also has a cyclone form, characterized in that the heating means consists of a counter-rotating burner of combustion air and combustible gas connected to an oven constituted by a volute arranged at the top of the thermal enclosure, while the source of cold air consists of a box connected to the outlet of the enclosure and comprising at least two cold air inlets which provide a counter-rotating air flow in the box stirring and cooling the products leaving the enclosure, said box being connected ordered to a volute arranged at the top of the cooler.
  • the divided products will rotate with the hot gases, under the effect of centrifugal force, in the volute of the oven constituting the upper part of the heat treatment enclosure, which will increase the contact time between the product and hot gases, and will promote heat treatment.
  • the rotation of the product and the hot gases in the volute furnace will increase the effect of axial depression in the heat treatment enclosure to finally favor the evacuation of the hot gases at the top of the oven, while the divided and processed products will be evacuated in the lower part of the cyclone.
  • the same type of advantage as above is found on the cooler due to the presence of a volute at its upper part. This volute improves the cooling of the treated product as well as the recovery of the air heated by this product.
  • the scroll furnace is connected to the means for supplying the product to be treated by means of an indirect exchanger communicating with the oven and forming a preheating chamber for the product injected into the burner.
  • the upper volute part of the cooler is connected to the burner in order to recycle the heated air leaving this cooler with the combustion air reaching this burner.
  • the inlet of the burner and of the cold air supply box of the cooler are respectively equipped with a venturi duct and with which is associated a nozzle for injecting pressurized air.
  • the nozzle associated with the burner opens into a space receiving the products to be treated leaving the indirect exchanger, while the nozzle associated with the cooler opens into a space receiving the products leaving the thermal enclosure.
  • a thermal treatment installation in accordance with the principles of the invention, essentially comprises a gas burner 1, means, such as for example a hopper 2, communicating with the burner 1 to supply it with divided product to be treated, an enclosure 10 for heat treatment of this product and connected to the outlet of the burner 1, and a cooler 20 ensuring the cooling of the treated product leaving the enclosure 10, and allowing the cooled product to be collected in any container 30.
  • the burner 1 is of a type known per se and has been described for example in FR-A-2 249 585 belonging to the applicant and to which reference may be made. Briefly speaking, the burner 1 comprises a metal enclosure 3 forming, on either side of a partition 6, a combustible gas box 4 and an oxidizing air box 5 which enters a mixing chamber 7 by injectors 8 opening tangentially to the wall 7a of the chamber 7. Thus, in the chamber 7, a mixture of oxidizing air is effected in counter-rotation with combustible gas penetrating into said chamber through orifices 9 formed in the wall 7a.
  • the burner 1 is of course equipped with an ignition system and a flame safety device, not shown.
  • FIG. 11 shows a gas inlet pipe to the gas box 4 of the burner 1 and equipped with a flow measurement device 12.
  • a pipe 13 fitted with any device 14 for flow measurement is connected to on the one hand to a source of pressurized air not shown and on the other hand to the inlet of the burner 1 in a manner which will be described in detail later, so as to be able to inject and pass through the developed flame in said burner, the divided products to be treated coming from the supply means 2.
  • the enclosure 10 which makes it possible to perfect the heat treatment of the product leaving the burner 1, is essentially constituted, at its upper part, by an oven 15 having a volute configuration 16 connected to the burner 1 as best seen in Figure 2, and, at its lower part, by a cylindrical-conical part forming a sort of cyclone 17.
  • the oven 15 forms a volute 16 widened at the upper part of cyclone 17 to finally come to merge with said upper part, as shown in 18 in FIG. 2.
  • the products treated in the enclosure 10 are collected in a hopper 19 and are conveyed by a line 21 of pressurized air to the cooler 20.
  • the latter has a general structure identical to the cyclone oven 15, 17.
  • the upper part 22 of the cooler 20 has a spiral or volute configuration 23, while the lower part of this cooler consists of a cylindrical-conical element 24 forming a sort of cyclone.
  • the upper part 22 in volute 23 is, as can be seen in FIGS. 1 and 2, connected to a box 25 quite comparable to the air box 5 of the burner 1.
  • the box 25 is provided with orifices shown diagrammatically at 26 and opening tangentially into the wall 27 of the box, so that the pressurized air arriving via line 28, optionally equipped with a flow measurement device 29, provides a flow of air against rotation in said box, which flow brews and cools the products leaving the enclosure 10.
  • the cooling will take place further and in an accelerated manner in the upper volute part 23 of the cyclone cooler 22, 24.
  • the hot fumes or gases leaving the 15-cyclone oven 17 are recovered by a pipe 31 and pass through an indirect exchanger 32 to be finally evacuated at 33.
  • the indirect exchanger 32 in a way forms a preheating chamber for the product to be treated which "passes through" the hot fumes coming from the enclosure 10.
  • volute 23 of the cyclone cooler 22, 24 is connected by a line 34 to the air box 5 of the burner 1 so as to thus recycle the heated air leaving the cooler with the combustion air in said burner.
  • the pipe 13 ends with a nozzle 35 for injecting pressurized air, which nozzle opens into a space 36 receiving the products to be treated leaving the exchanger 32.
  • a conduit 37 forming a venturi 37a and joining the space 36 at the inlet of the burner 1.
  • the same arrangement is made at the inlet of the air box 25 of the cyclone cooler 22, 24.
  • a conduit forming a venturi 38 connecting the air box 25 to a space 39 receiving the treated products and leaving the enclosure 10, while in said space, opens the conduit 21, as seen in Figure 3.
  • the installation which has just been described is particularly suitable for the heat treatment of powdery solid products, such as for example sand, metal chips or various mineral products.
  • the product divided and preheated by the exchanger 32 passes through the flame of the burner 1 and then follows the spiral path of the furnace 15.
  • the homogenization and the contact time of the divided products with the fumes are increased, and the rotation of the products mixed with the hot gases in the oven 15 increases the vacuum in the center of the cyclone oven 15, 17 so that the fumes are easily recovered by the pipe 31, while, after passing through the oven 15, the divided products fall into the cyclone 17 and are taken up by the cyclone-cooler 22, 24.
  • An installation has therefore been produced according to the present invention allowing an effective, reliable and inexpensive heat treatment of very diverse products including pasty products with high cohesion.
  • the invention is in no way limited to the embodiment described and illustrated, which has been given only by way of example.
  • it is possible to provide a coating of refractory concrete or other material inside the cyclone furnace.
  • the connections of the various elements of the installation can be carried out in any suitable manner whatsoever.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Microbiology (AREA)
  • Processing Of Solid Wastes (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Cyclones (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)

Abstract

1. Installation of heat treatment of any sort of divided products and of the type comprising a heating means connected with product feeding means (2) to be treated and with an enclosure (10) of heat treatment of that product which exhibits a cyclone-shaped lower part (17), from where the product is coming out to arrive to a cooler (20) connected with a source of cold air and the lower part (24) of which exhibits a cyclone shape too, characterized in that the heating means is a burner (1) in counter-rotation of combustive air and of combustible gas connected with an oven (15) made up of a volute (16) mounted at the top part of the thermal enclosure (10), whereas the source of cold air is made up of a cap (25) connected with the exit of the enclosure (10) and comprising at least two cold air inlets (26) which provide in the cap (25) an air flow in counter-rotation mixing and cooling down the products coming out from the enclosure (10), the said cap being connected with a volute (23) mounted at the top part (22) of the cooler (20).

Description

La présente invention a pour objet une installation de traitement par voie thermique de produits divisés qui peuvent être solides, liquides ou pâteux.The present invention relates to an installation for the thermal treatment of divided products which may be solid, liquid or pasty.

On sait que les traitements thermiques de produits divisés ou granuleux à des températures diverses sont très nombreux. Ces traitements permettent par exemple de sécher du sable, d'effectuer la cuisson du gypse pour la fabrication de plâtre, ou encore d'effectuer la pyrolyse de pigments colorés, étant entendu que bien d'autres traitements thermiques peuvent être envisagés en fonction de la nature des produits divisés que l'on veut traiter et des résultats que l'on désire obtenir.It is known that the thermal treatments of divided or granular products at various temperatures are very numerous. These treatments make it possible for example to dry sand, to carry out the cooking of gypsum for the manufacture of plaster, or even to carry out the pyrolysis of colored pigments, it being understood that many other heat treatments can be envisaged depending on the nature of the divided products which one wants to treat and the results which one wishes to obtain.

C'est ainsi que, par exemple, on a déjà proposé dans le document US-A-1 892 233 une installation de traitement thermique de produits divisés quelconques et qui comprend un dispositif de chauffage raccordé à des moyens d'alimentation en produit à traiter et à une enceinte de traitement thermique de ce produit qui présente une partie inférieure en forme de cyclone d'où sort le produit pour parvenir à une enceinte de refroidissement raccordée à une source d'air froid et dont la partie inférieure présente aussi une forme de cyclone.Thus, for example, there has already been proposed in document US-A-1 892 233 an installation for heat treatment of any divided products and which comprises a heating device connected to means for supplying the product to be treated and to a heat treatment chamber for this product which has a cyclone-shaped lower part from which the product leaves to reach a cooling chamber connected to a source of cold air and the lower part of which also has a form of cyclone.

Toutefois, une telle installation n'est pas de nature à donner des résultats très satisfaisants, tant au niveau de l'enceinte de traitement thermique des produits divisés et chauffés, qu'au niveau du traitement de ces produits dans l'enceinte de refroidissement en aval de l'enceinte citée en premier lieu. En d'autres termes, le traitement thermique peut s'avérer déficient aux deux niveaux précités, et une telle- installation ne peut pas être universelle, c'est-à-dire convenir pour toutes sortes de produits divisés, qu'ils soient solides, liquides ou pâteux.However, such an installation is not likely to give very satisfactory results, both at the level of the heat treatment enclosure of the divided and heated products, and at the level of the treatment of these products in the cooling enclosure in downstream of the first mentioned enclosure. In other words, the heat treatment may prove to be deficient at the two aforementioned levels, and such an installation cannot be universal, that is to say suitable for all kinds of divided products, whether they are solid , liquid or pasty.

La présente invention a pour but de remédier aux inconvénients ci-dessus en proposant une installation qui permet, sans limitation, le traitement par voie thermique à une température quelconque de tous types de produits divisés, et cela avec une excellente fiabilité de résultats et un coût qui demeure minime.The object of the present invention is to remedy the above drawbacks by proposing an installation which allows, without limitation, heat treatment at any temperature of all types of divided products, and this with excellent reliability of results and cost. which remains minimal.

A cet effet, l'invention a pour objet une installation de traitement thermique de produits divisés quelconques et du type comprenant un moyen de chauffage raccordé à des moyens d'alimentation en produit à traiter et à une enceinte de traitement thermique de ce produit qui présente une partie inférieure en forme de cyclone d'où sort le produit pour parvenir à un refroidisseur raccordé à une source d'air froid et dont la partie inférieure présente aussi une forme de cyclone, caractérisée en ce que le moyen de chauffage est constitué par un brûleur à contre-rotation d'air comburant et de gaz combustible raccordé à un four constitué par une volute agencée à la partie supérieure de l'enceinte thermique, tandis que la source d'air froid est constituée par une boîte raccordée à la sortie de l'enceinte et comportant au moins deux arrivées d'air froid qui procurent dans la boîte un flux d'air à contre-rotation brassant et refroidissant les produits sortant de l'enceinte, ladite boîte étant raccordée à une volute agencée à la partie supérieure du refroidisseur.To this end, the subject of the invention is an installation for heat treatment of any divided products and of the type comprising a heating means connected to means for supplying the product to be treated and to a chamber for heat treatment of this product which has a cyclone-shaped lower part from which the product leaves to reach a cooler connected to a source of cold air and the lower part of which also has a cyclone form, characterized in that the heating means consists of a counter-rotating burner of combustion air and combustible gas connected to an oven constituted by a volute arranged at the top of the thermal enclosure, while the source of cold air consists of a box connected to the outlet of the enclosure and comprising at least two cold air inlets which provide a counter-rotating air flow in the box stirring and cooling the products leaving the enclosure, said box being connected ordered to a volute arranged at the top of the cooler.

On comprend donc que les produits divisés tourneront avec les gaz chauds, sous l'effet de la force centrifuge, dans la volute du four constituant la partie supérieure de l'enceinte de traitement thermique, ce qui augmentera le temps de contact entre le produit et les gaz chauds, et favorisera le traitement thermique. En même temps, la rotation du produit et des gaz chauds dans le four en volute augmentera l'effet de dépression axiale dans l'enceinte de traitement thermique pour finalement favoriser l'évacuation des gaz chauds à la partie supérieure du four, alors que les produits divisés et traités seront évacués en partie basse du cyclone. Le même type d'avantage que ci-dessus se retrouve sur le refroidisseur en raison de la présence d'une volute à sa partie supérieure. Cette volute améliore en effet le refroidissement du produit traité ainsi que la récupération de l'air réchauffé par ce produit.It is therefore understood that the divided products will rotate with the hot gases, under the effect of centrifugal force, in the volute of the oven constituting the upper part of the heat treatment enclosure, which will increase the contact time between the product and hot gases, and will promote heat treatment. At the same time, the rotation of the product and the hot gases in the volute furnace will increase the effect of axial depression in the heat treatment enclosure to finally favor the evacuation of the hot gases at the top of the oven, while the divided and processed products will be evacuated in the lower part of the cyclone. The same type of advantage as above is found on the cooler due to the presence of a volute at its upper part. This volute improves the cooling of the treated product as well as the recovery of the air heated by this product.

Suivant une autre caractéristique de l'installation, le four en volute est raccordé aux moyens d'alimentation en produit à traiter par l'intermédiaire d'un échangeur indirect communiquant avec le four et formant chambre de préchauffage du produit injecté dans le brûleur.According to another characteristic of the installation, the scroll furnace is connected to the means for supplying the product to be treated by means of an indirect exchanger communicating with the oven and forming a preheating chamber for the product injected into the burner.

Selon encore une autre caractéristique, la partie supérieure en volute du refroidisseur est raccordée au brûleur pour recycler l'air réchauffé sortant de ce refroidisseur avec l'air comburant parvenant à ce brûleur.According to yet another characteristic, the upper volute part of the cooler is connected to the burner in order to recycle the heated air leaving this cooler with the combustion air reaching this burner.

Suivant une autre caractéristique de l'installation, l'entrée du brûleur et de la boîte d'alimentation en air froid du refroidisseur sont respectivement équipés d'un conduit formant venturi et auquel est associée une buse d'injection d'air sous pression.According to another characteristic of the installation, the inlet of the burner and of the cold air supply box of the cooler are respectively equipped with a venturi duct and with which is associated a nozzle for injecting pressurized air.

On précisera encore ici que la buse associée au brûleur débouche dans un espace recevant les produits à traiter sortant de l'échangeur indirect, tandis que la buse associée au refroidisseur débouche dans un espace recevant les produits sortant de l'enceinte thermique.It will also be specified here that the nozzle associated with the burner opens into a space receiving the products to be treated leaving the indirect exchanger, while the nozzle associated with the cooler opens into a space receiving the products leaving the thermal enclosure.

Mais d'autres caractéristiques et avantages de l'invention apparaîtront mieux dans la description détaillée qui suit et se réfère aux dessins annexés, donnés uniquement à titre d'exemple, et dans lesquels :

  • La figure 1 est une vue schématique en élévation d'une installation de traitement thermique conforme aux principes de l'invention ;
  • La figure 2 est une vue de dessus, avec arrachement partiel, de l'enceinte associée au brûleur, et du refroidisseur des produits divisés sortant de cette enceinte ;
  • La figure 3 est une vue agrandie et en coupe du système d'injection des produits divisés dans le brûleur ; et
  • La figure 4 illustre en élévation et coupe verticale un autre mode de réalisation de système d'injection, utilisé lorsque l'on désire traiter des produits semi-solides ou pâteux.
However, other characteristics and advantages of the invention will appear better in the detailed description which follows and refers to the appended drawings, given solely by way of example, and in which:
  • Figure 1 is a schematic elevational view of a thermal treatment installation according to the principles of the invention;
  • Figure 2 is a top view, partially cut away, of the enclosure associated with the burner, and of the cooler of the divided products leaving this enclosure;
  • Figure 3 is an enlarged sectional view of the injection system for the divided products in the burner; and
  • Figure 4 illustrates in elevation and vertical section another embodiment of the injection system, used when it is desired to treat semi-solid or pasty products.

Suivant un exemple de réalisation, et en se reportant plus particulièrement aux figures 1 et 2, une installation de traitement thermique conforme aux principes de l'invention, comprend essentiellement un brûleur à gaz 1, des moyens, tels que par exemple une trémie 2, communiquant avec le brûleur 1 pour l'alimenter en produit divisé à traiter, une enceinte 10 de traitement thermique de ce produit et raccordée à la sortie du brûleur 1, et un refroidisseur 20 assurant le refroidissement du produit traité sortant de l'enceinte 10, et permettant de recueillir le produit refroidi dans un récipient quelconque 30.According to an exemplary embodiment, and with particular reference to FIGS. 1 and 2, a thermal treatment installation in accordance with the principles of the invention, essentially comprises a gas burner 1, means, such as for example a hopper 2, communicating with the burner 1 to supply it with divided product to be treated, an enclosure 10 for heat treatment of this product and connected to the outlet of the burner 1, and a cooler 20 ensuring the cooling of the treated product leaving the enclosure 10, and allowing the cooled product to be collected in any container 30.

Le brûleur 1 est d'un type en soi connu et a été décrit par exemple dans le FR-A-2 249 585 appartenant à la demanderesse et auquel on pourra se reporter. Brièvement parlant, le brûleur 1 comporte une enceinte métallique 3 formant, de part et d'autre d'une cloison 6, une boîte à gaz combustible 4 et une boîte à air comburant 5 qui pénètre dans une chambre de mélange 7 par des injecteurs 8 débouchant tangentiellement à la paroi 7a de la chambre 7. Ainsi, dans la chambre 7, s'effectue un mélange d'air comburant à contre-rotation avec du gaz combustible pénétrant dans ladite chambre par des orifices 9 ménagés dans la paroi 7a. Le brûleur 1 est bien sûr équipé d'un système d'allumage et d'un dispositif de sécurité de flamme, non représentés.The burner 1 is of a type known per se and has been described for example in FR-A-2 249 585 belonging to the applicant and to which reference may be made. Briefly speaking, the burner 1 comprises a metal enclosure 3 forming, on either side of a partition 6, a combustible gas box 4 and an oxidizing air box 5 which enters a mixing chamber 7 by injectors 8 opening tangentially to the wall 7a of the chamber 7. Thus, in the chamber 7, a mixture of oxidizing air is effected in counter-rotation with combustible gas penetrating into said chamber through orifices 9 formed in the wall 7a. The burner 1 is of course equipped with an ignition system and a flame safety device, not shown.

On a montré en 11 une conduite d'arrivée de gaz à la boîte à gaz 4 du brûleur 1 et équipée d'un appareil de mesure de débit 12. Une conduite 13 équipée d'un appareil quelconque 14 de mesure de débit est raccordée d'une part à une source d'air sous pression non représentée et d'autre part à l'entrée du brûleur 1 d'une façon qui sera décrite en détail ultérieurement, de façon à pouvoir injecter et faire passer au travers de la flamme développée dans ledit brûleur, les produits divisés à traiter provenant des moyens d'alimentation 2.11 shows a gas inlet pipe to the gas box 4 of the burner 1 and equipped with a flow measurement device 12. A pipe 13 fitted with any device 14 for flow measurement is connected to on the one hand to a source of pressurized air not shown and on the other hand to the inlet of the burner 1 in a manner which will be described in detail later, so as to be able to inject and pass through the developed flame in said burner, the divided products to be treated coming from the supply means 2.

Suivant une caractéristique essentielle de l'invention, l'enceinte 10 qui permet de parfaire le traitement thermique du produit sortant du brûleur 1, est essentiellement constituée, à sa partie supérieure, par un four 15 présentant une configuration en volute 16 raccordée au brûleur 1 comme on le voit mieux sur la figure 2, et, à sa partie inférieure, par une partie cylindro-conique formant en quelque sorte un cyclone 17. Autrement dit, le four 15 forme une volute 16 élargie à la partie supérieure du cyclone 17 pour venir finalement se confondre avec ladite partie supérieure, comme on l'a montré en 18 sur la figure 2.According to an essential characteristic of the invention, the enclosure 10 which makes it possible to perfect the heat treatment of the product leaving the burner 1, is essentially constituted, at its upper part, by an oven 15 having a volute configuration 16 connected to the burner 1 as best seen in Figure 2, and, at its lower part, by a cylindrical-conical part forming a sort of cyclone 17. In other words, the oven 15 forms a volute 16 widened at the upper part of cyclone 17 to finally come to merge with said upper part, as shown in 18 in FIG. 2.

Les produits traités dans l'enceinte 10 sont recueillis dans une trémie 19 et sont acheminés par une conduite 21 d'air sous pression au refroidisseur 20. Ce dernier présente une structure générale identique au four-cyclone 15, 17. En d'autres termes, la partie.supérieure 22 du refroidisseur 20 présente une configuration spiralée ou en volute 23, tandis que la partie inférieure de ce refroidisseur est constituée par un élément cylindro-conique 24 formant en quelque sorte un cyclone. La partie supérieure 22 en volute 23 est, comme on le voit bien sur les figures 1 et 2, raccordée à une boîte 25 tout à fait comparable à la boîte à air 5 du brûleur 1. Plus précisément, la boîte 25 est munie d'orifices montrés schématiquement en 26 et débouchant tangentiellement dans la paroi 27 de la boîte, de sorte que l'air sous pression arrivant par la conduite 28 éventuellement équipée d'un appareil de mesure de débit 29, procure un flux d'air à contre-rotation dans ladite boîte, lequel flux brasse et refroidit les produits sortant de l'enceinte 10. Bien entendu, le refroidissement s'effectuera encore et de façon accélérée dans la partie supérieure en volute 23 du refroidisseur-cyclone 22, 24.The products treated in the enclosure 10 are collected in a hopper 19 and are conveyed by a line 21 of pressurized air to the cooler 20. The latter has a general structure identical to the cyclone oven 15, 17. In other words , the upper part 22 of the cooler 20 has a spiral or volute configuration 23, while the lower part of this cooler consists of a cylindrical-conical element 24 forming a sort of cyclone. The upper part 22 in volute 23 is, as can be seen in FIGS. 1 and 2, connected to a box 25 quite comparable to the air box 5 of the burner 1. More specifically, the box 25 is provided with orifices shown diagrammatically at 26 and opening tangentially into the wall 27 of the box, so that the pressurized air arriving via line 28, optionally equipped with a flow measurement device 29, provides a flow of air against rotation in said box, which flow brews and cools the products leaving the enclosure 10. Of course, the cooling will take place further and in an accelerated manner in the upper volute part 23 of the cyclone cooler 22, 24.

Les fumées ou gaz chauds sortant du four 15-cyclone 17 sont récupérés par une conduite 31 et passent dans un échangeur indirect 32 pour être finalement évacués en 33. Comme on le comprend en se reportant plus particulièrement à la figure 1, l'échangeur indirect 32 forme en quelque sorte une chambre de préchauffage du produit à traiter qui « traverse » les fumées chaudes provenant de l'enceinte 10.The hot fumes or gases leaving the 15-cyclone oven 17 are recovered by a pipe 31 and pass through an indirect exchanger 32 to be finally evacuated at 33. As will be understood by referring more particularly to FIG. 1, the indirect exchanger 32 in a way forms a preheating chamber for the product to be treated which "passes through" the hot fumes coming from the enclosure 10.

La volute 23 du refroidisseur-cyclone 22, 24 est raccordée par une conduite 34 à la boîte à air 5 du brûleur 1 de façon à ainsi recycler l'air réchauffé sortant du refroidisseur avec l'air comburant dans ledit brûleur.The volute 23 of the cyclone cooler 22, 24 is connected by a line 34 to the air box 5 of the burner 1 so as to thus recycle the heated air leaving the cooler with the combustion air in said burner.

Comme on le voit mieux sur la figure 3, la conduite 13 se termine par une buse 35 d'injection d'air sous pression, laquelle buse débouche dans un espace 36 recevant les produits à traiter sortant de l'échangeur 32. Dans l'axe de la buse 35 est prévu un conduit 37 formant venturi 37a et réunissant l'espace 36 à l'entrée du brûleur 1. Le même agencement est réalisé à l'entrée de la boîte à air 25 du refroidisseur-cyclone 22, 24. En se reportant à la figure 1, on voit en effet un conduit formant venturi 38 raccordant la boîte à air 25 à un espace 39 recevant les produits traités et sortant de l'enceinte 10, tandis que dans ledit espace, débouche le conduit 21, comme cela est visible sur la figure 3.As best seen in FIG. 3, the pipe 13 ends with a nozzle 35 for injecting pressurized air, which nozzle opens into a space 36 receiving the products to be treated leaving the exchanger 32. In the axis of the nozzle 35 is provided a conduit 37 forming a venturi 37a and joining the space 36 at the inlet of the burner 1. The same arrangement is made at the inlet of the air box 25 of the cyclone cooler 22, 24. Referring to FIG. 1, there is in fact seen a conduit forming a venturi 38 connecting the air box 25 to a space 39 receiving the treated products and leaving the enclosure 10, while in said space, opens the conduit 21, as seen in Figure 3.

L'installation qui vient d'être décrite est particulièrement adaptée au traitement thermique de produits solides pulvérulents, tels que par exemple le sable, les copeaux métalliques ou les produits minéraux divers.The installation which has just been described is particularly suitable for the heat treatment of powdery solid products, such as for example sand, metal chips or various mineral products.

Mais cette installation se prête tout à fait bien au traitement de produits pâteux divers, dans quel cas lesdits produits seront divisés avant injection au brûleur, à l'aide d'un dispositif de broyage, de découpage ou analogue et tel que celui représenté par exemple sur la figure 4. On retrouve sur cette figure un conduit 40 formant venturi et auquel est associée une buse 41 d'injection d'air pour acheminer le produit une fois divisé à l'entrée du brûleur 1 où il traversera la flamme développée dans ce brûleur. Mais, en amont du conduit 40, on prévoit un couteau rotatif et une grille repérés schématiquement et respectivement en 42 et 43. Au-dessus de ce couteau et de cette grille est montée une vis sans fin 44 entraînée en rotation par un moteur (non représenté) et permettant l'acheminement du produit pâteux provenant du conduit 45, au travers de la grille 43, comme cela se comprend. Ainsi, un produit pâteux finement divisé pourra être envoyé au brûleur 1. On ajoutera encore ici que l'on peut parfaitement traiter avec une installation conforme à l'invention des produits liquides qui seront pulvérisés en gouttelettes par des moyens connus avant de passer au travers de la flamme du brûleur 1, lesdites gouttelettes étant aspirées par un venturi et éjectées au travers de ladite flamme, comme on l'a décrit précédemment.But this installation lends itself quite well to the treatment of various pasty products, in which case said products will be divided before injection into the burner, using a grinding, cutting or similar device and such as that shown for example in Figure 4. We find in this figure a conduit 40 forming a venturi and with which is associated an air injection nozzle 41 for conveying the product once divided at the inlet of the burner 1 where it will pass through the flame developed in this burner. But in upstream of the duct 40, there is provided a rotary knife and a grid marked diagrammatically and respectively at 42 and 43. Above this knife and this grid is mounted an endless screw 44 driven in rotation by a motor (not shown) and allowing the delivery of the pasty product from the conduit 45, through the grid 43, as is understood. Thus, a finely divided pasty product can be sent to the burner 1. It will also be added here that it is perfectly possible to treat with an installation in accordance with the invention liquid products which will be sprayed into droplets by known means before passing through from the flame of the burner 1, said droplets being sucked in by a venturi and ejected through said flame, as described above.

'Le fonctionnement de l'installation se déduit immédiatement de la description qui précède et sera brièvement donné ci-après en insistant sur les avantages procurés.The operation of the installation is immediately deduced from the above description and will be briefly given below, stressing the advantages provided.

Le produit divisé et préchauffé par l'échangeur 32 passe au travers de la flamme du brûleur 1 pour ensuite suivre la trajectoire en spirale du four 15. Ainsi, l'homogénéisation et le temps de contact des produits divisés avec les fumées sont accrus, et la rotation des produits mélangés aux gaz chauds dans le four 15 augmente la dépression au centre du four-cyclone 15,17 de sorte que les fumées sont facilement récupérées par la conduite 31, alors que, après passage dans le four 15, les produits divisés tombent dans le cyclone 17 et sont repris par le refroidisseur-cyclone 22, 24. Etant donné la structure sensiblement identique du refroidisseur-cyclone 22, 24 et du four-cyclone 15, 17, on obtient une efficacité de refroidissement comparable à l'efficacité du traitement thermique effectué précédemment.The product divided and preheated by the exchanger 32 passes through the flame of the burner 1 and then follows the spiral path of the furnace 15. Thus, the homogenization and the contact time of the divided products with the fumes are increased, and the rotation of the products mixed with the hot gases in the oven 15 increases the vacuum in the center of the cyclone oven 15, 17 so that the fumes are easily recovered by the pipe 31, while, after passing through the oven 15, the divided products fall into the cyclone 17 and are taken up by the cyclone-cooler 22, 24. Given the substantially identical structure of the cyclone-cooler 22, 24 and the cyclone-oven 15, 17, a cooling efficiency comparable to the efficiency is obtained of the heat treatment carried out previously.

On a donc réalisé suivant la présente invention une installation permettant un traitement thermique efficace, fiable et peu onéreux de produits très divers y compris des produits pâteux à forte cohésion.An installation has therefore been produced according to the present invention allowing an effective, reliable and inexpensive heat treatment of very diverse products including pasty products with high cohesion.

L'invention n'est nullement limitée au mode de réalisation décrit et illustré qui n'a été donné qu'à titre d'exemple. C'est ainsi que l'on peut prévoir un revêtement en béton réfractaire ou autre matière à l'intérieur du four-cyclone. Egalement, les raccordements des divers éléments de l'installation peuvent être effectués selon toute manière appropriée quelconque.The invention is in no way limited to the embodiment described and illustrated, which has been given only by way of example. Thus it is possible to provide a coating of refractory concrete or other material inside the cyclone furnace. Also, the connections of the various elements of the installation can be carried out in any suitable manner whatsoever.

Claims (5)

1. Installation of heat treatment of any sort of divided products and of the type comprising a heating means connected with product feeding means (2) to be treated and with an enclosure (10) of heat treatment of that product which exhibits a cyclone-shaped lower part (17), from where the product is coming out to arrive to a cooler (20) connected with a source of cold air and the lower part (24) of which exhibits a cyclone shape too, characterized in that the heating means is a burner (1) in counter-rotation of combustive air and of combustible gas connected with an oven (15) made up of a volute (16) mounted at the top part of the thermal enclosure (10), whereas the source of cold air is made up of a cap (25) connected with the exit of the enclosure (10) and comprising at least two cold air inlets (26) which provide in the cap (25) an air flow in counter-rotation mixing and cooling down the products coming out from the enclosure (10), the said cap being connected with a volute (23) mounted at the top part (22) of the cooler (20).
2. Installation according to claim 1, characterized in that the volute (16)-shaped oven (15) is connected with the product feeding means (2) to be treated through the medium of an indirect exchanger (32) communicating with the oven (15) and forming a chamber for preheating of the product injected in the burner (1).
3. Installation according to claim 1 or 2, characterized in that the volute-shaped (23) top part (22) of the cooler (20) is connected to the burner (1) to recycle the heated air coming out from that cooler with the combustive air arriving to that burner.
4. Installation according to one of claims 1 to 3, characterized in that the inlets of the burner (1) and of the cap (25) of feeding in cold air of the cooler (20) are respectively equipped with a pipe forming a venturi (37, 38) and with which is associated an injection nozzle (35, 21) of forced air.
5. Installation according to one of the preceding claims, characterized in that the injection nozzle (35) associated with the burner (1) comes out into a space (36) receiving the products to be treated coming out from the indirect exchanger (32), whereas the nozzle (21) associated with the cooler (20) comes out into a space (39) receiving the products coming out from the thermal enclosure (10).
EP84400574A 1983-03-23 1984-03-21 Apparatus for heat-treating of particular material Expired EP0124390B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400574T ATE27856T1 (en) 1983-03-23 1984-03-21 DEVICE FOR THE HEAT TREATMENT OF PARTICULATE MATERIAL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8304771 1983-03-23
FR8304771A FR2543280B1 (en) 1983-03-23 1983-03-23 METHOD AND PLANT FOR HEAT TREATMENT OF DIVIDED PRODUCTS

Publications (2)

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EP0124390A1 EP0124390A1 (en) 1984-11-07
EP0124390B1 true EP0124390B1 (en) 1987-06-16

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EP84400574A Expired EP0124390B1 (en) 1983-03-23 1984-03-21 Apparatus for heat-treating of particular material

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EP (1) EP0124390B1 (en)
AT (1) ATE27856T1 (en)
CA (1) CA1261619A (en)
DE (2) DE3464284D1 (en)
FR (1) FR2543280B1 (en)

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Publication number Priority date Publication date Assignee Title
CN107904829A (en) * 2017-12-28 2018-04-13 苏州朦井纺织科技有限公司 A kind of textile material heating unit

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Publication number Priority date Publication date Assignee Title
JPH03504155A (en) * 1989-01-18 1991-09-12 モギレフスキー、チェフノロギーチェスキー　インスチツート Heat treatment equipment for polydisperse substances
DE19809067A1 (en) * 1998-03-04 1999-09-09 Nissen Device for drying and heating dust-form and fine granular material
KR100773018B1 (en) * 2007-02-16 2007-11-02 한국과학기술원 Micro shutter device using polymer pattern as a mold, and Method of the forming the same

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FR956999A (en) * 1950-02-10
US1329813A (en) * 1917-03-28 1920-02-03 G A Buhl Company Process of drying solids
US1892233A (en) * 1930-07-14 1932-12-27 Chappell Frank Lewis Method of and apparatus for drying casein
GB566170A (en) * 1942-08-18 1944-12-18 Frederick Jonathan Fison Improvements in or relating to a method of and means for drying powdered or other more or less finely divided material
FR1325620A (en) * 1961-10-20 1963-05-03 Kloeckner Humboldt Deutz Ag Device for heating fine-grained material, in particular raw cement powder
DE2061980C3 (en) * 1970-12-16 1975-11-13 Polysius Ag, 4723 Neubeckum Plant for firing and / or sintering fine material
FR2351369A1 (en) * 1976-05-13 1977-12-09 Gaz De France High efficiency gas burner - for preheating oily metal swarf, reclaiming foundry sand, or mfg. perlite or vermiculite
GB1570276A (en) * 1976-12-31 1980-06-25 White J Method and apparatus for heating particulate solids

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107904829A (en) * 2017-12-28 2018-04-13 苏州朦井纺织科技有限公司 A kind of textile material heating unit

Also Published As

Publication number Publication date
CA1261619A (en) 1989-09-26
DE124390T1 (en) 1985-08-14
FR2543280A1 (en) 1984-09-28
FR2543280B1 (en) 1987-12-04
EP0124390A1 (en) 1984-11-07
DE3464284D1 (en) 1987-07-23
ATE27856T1 (en) 1987-07-15

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