EP1936308A1 - Rocking furnace with internal baffles - Google Patents
Rocking furnace with internal baffles Download PDFInfo
- Publication number
- EP1936308A1 EP1936308A1 EP07291458A EP07291458A EP1936308A1 EP 1936308 A1 EP1936308 A1 EP 1936308A1 EP 07291458 A EP07291458 A EP 07291458A EP 07291458 A EP07291458 A EP 07291458A EP 1936308 A1 EP1936308 A1 EP 1936308A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oscillating
- furnace
- sole
- partitions
- furnace according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
- F27B7/16—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
Definitions
- the present invention relates to the technique of continuous furnaces of the type called "oscillating furnace".
- the first is that one can have the burners at one or the other end of the enclosure, which makes it very difficult to control the temperature profile in the enclosure;
- the second is that it is very difficult to control the flow rate of products when it is desired to use the same oven for products of different sizes.
- This device is a remarkable improvement of the oscillating furnaces, but this type of furnace does not make it possible to treat a great variety of products, in particular for the sintering treatment of balls because their sphericity generates a too fluid flow, which does not allow a satisfactory treatment.
- sintered balls are for example used in grinding processes or serve as a load in fluid pumping processes.
- Such beads are still useful as catalyst or insulator supports.
- the oscillating furnace according to the present invention is an oven comprising a substantially tubular body, inclined, provided with means oscillating along its longitudinal axis, said substantially tubular body having a sole and an arch carrying heating means, characterized in that the sole has baffles so that the progression of products passing through the furnace is in a zigzag path.
- the figure 1 represents an oscillating furnace of known type.
- the furnace itself has a tubular body consisting of a sole 1, covered with an upper part, or arch, 2 in the wall of which are disposed heating means such as burners 3 and thermal probes 4.
- the tubular body 1-2 is carried by a frame 5 placed in a semi-circular cradle 6 carried by rollers 7, which serve to oscillate the cradle 6.
- the sole 1 of said furnace is generally flat.
- FIGS. 2 and 3 represent, schematically, a first embodiment of the invention.
- the sole 1 of the furnace is of semicircular section and is provided with transverse partitions 10 carried by its wall and defining brewing chambers.
- the angle ⁇ between the transverse partitions 10 and the wall of the hearth 1 is equal to 90 °, but it can be different, obtuse or acute.
- the routing of the products in the furnace is dependent on the orientation of said partitions 10 with respect to the wall of the hearth.
- said partitions 10 are inclined towards the entrance of the oven, the products are partly brought back to the brewing chamber arranged upstream which extends their travel time in the oven.
- the partitions 10 are inclined towards the outlet of the oven, some of the products can be made to travel more quickly the oven.
- the partitions 10 extend to the longitudinal median plane XX of the hearth 1, whereas in the example shown in FIGS. Figures 4 and 5 the partitions 10 go beyond said median plane and extend over more than half of the section of the hearth 1.
- Said partitions 10 form baffles which force the products circulating in the oven in the general direction of the median plane XX to make a zigzag path A or B (the zigzags B being more accentuated than A) when the oven oscillates a chamber located on one side of the median plane XX to a chamber located downstream and on the other side of the median plane XX.
- partitions 10 can equip a flat-bottomed oven such as that shown in FIG. figure 1 .
- the bottom of the hearth 1 is flat and has a plurality of ridges 11. Said ridges 11 cause additional stirring of the products during their overall transverse movement due to oscillations of the furnace. Said ridges 11 are arranged in any way in the bottom of the hearth, and are not necessarily longitudinal.
- ridges may also be provided in an oven of any section, for example circular.
- the partitions 10 may not be equidistant, but shifted so that the path C is not shifted.
- the partitions 10 are rotatably mounted relative to the wall of the hearth to allow a modification of their orientation angle ⁇ in function of current production.
- the figure 10 illustrates an alternative embodiment of the figure 9 in which the cells 12 comprise semi-cylindrical chambers which cause small eddies E, which increases the brewing effect of the products.
- the partitions 10 are arranged as in the example of the figure 3 that is, they do not go beyond the median plane XX and are symmetrically distributed.
- the hearth 1 comprises, in addition to the partitions 10 a bottom which is not flat but which is provided in its median part with a ridge 14 (similar to that described in the aforementioned patent 79-0040), ridge that is located in the midplane XX.
- the products are therefore subjected to a double movement: they are obliged to follow a sinuous course (A, B, C, D, E) which operates a lateral brewing and they undergo a stirring up and down crossing the ridge 14.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Tunnel Furnaces (AREA)
Abstract
Description
La présente invention concerne la technique des fours continus du type dit « four oscillant ».The present invention relates to the technique of continuous furnaces of the type called "oscillating furnace".
Il est connu de réaliser des fours continus qui sont constitués par une enceinte tubulaire inclinée qui est mise en rotation de sorte que la matière devant subir un traitement thermique traverse ladite enceinte de part en part.It is known to provide continuous furnaces which are constituted by an inclined tubular enclosure which is rotated so that the material to undergo heat treatment passes through said enclosure from side to side.
Ces fours, couramment employés en cimenterie et pour la calcination de produits pulvérulents présentent deux inconvénients.These furnaces, commonly used in cement and for the calcination of pulverulent products have two disadvantages.
Le premier est que l'on ne peut disposer des brûleurs qu'à l'une ou l'autre des extrémités de l'enceinte, ce qui rend très difficile le contrôle du profil de température dans l'enceinte ; le deuxième est qu'il est très difficile de contrôler la vitesse d'écoulement des produits lorsque l'on désire employer le même four pour des produits de granulométries différentes.The first is that one can have the burners at one or the other end of the enclosure, which makes it very difficult to control the temperature profile in the enclosure; the second is that it is very difficult to control the flow rate of products when it is desired to use the same oven for products of different sizes.
On a alors proposé l'emploi de fours oscillants, c'est-à-dire de fours animés d'un mouvement de rotation partielle suivant un mouvement alternatif. Cette disposition permet de positionner des brûleurs dans la partie supérieure de l'enceinte et donc de contrôler et régler à volonté la température le long du trajet parcouru par les produits traversant le four.It was then proposed the use of oscillating furnaces, that is to say furnaces animated by a partial rotational movement in a reciprocating motion. This arrangement allows to position the burners in the upper part of the enclosure and thus to control and adjust at will the temperature along the path traveled by the products passing through the oven.
Dans le brevet
Ce dispositif constitue une amélioration remarquable des fours oscillants, mais ce type de four ne permet pas de traiter une grande variété de produits, en particulier pour le traitement de frittage de billes parce que leur sphéricité engendre un écoulement trop fluide, qui ne permet pas un traitement satisfaisant.This device is a remarkable improvement of the oscillating furnaces, but this type of furnace does not make it possible to treat a great variety of products, in particular for the sintering treatment of balls because their sphericity generates a too fluid flow, which does not allow a satisfactory treatment.
De manière connue en soi, des billes frittées sont par exemple utilisées dans des procédés de broyage ou servent de charge dans des procédés de pompage de fluide.In a manner known per se, sintered balls are for example used in grinding processes or serve as a load in fluid pumping processes.
De telles billes sont encore utiles en tant que supports de catalyseurs ou d'isolants.Such beads are still useful as catalyst or insulator supports.
Le four oscillant selon la présente invention est un four comprenant un corps sensiblement tubulaire, incliné, muni de moyens le faisant osciller selon son axe longitudinal, ledit corps sensiblement tubulaire comportant une sole et une voûte portant des moyens de chauffage, caractérisé par le fait que la sole comporte des chicanes de telle sorte que la progression des produits cheminant à travers le four se fasse selon une trajectoire en zigzag.The oscillating furnace according to the present invention is an oven comprising a substantially tubular body, inclined, provided with means oscillating along its longitudinal axis, said substantially tubular body having a sole and an arch carrying heating means, characterized in that the sole has baffles so that the progression of products passing through the furnace is in a zigzag path.
Le four selon l'invention est encore remarquable en ce que :
- les chicanes sont définies par des cloisons portées par la paroi formant la sole,
- les cloisons s'étendent au moins jusqu'au plan longitudinal médian du four,
- les cloisons sont séparées les unes des autres de distances égales de façon à constituer des chicanes définissant entre elles un parcours sinueux régulier pour les produits,
- les cloisons sont irrégulièrement espacées les unes des autres de façon à constituer des chicanes définissant entre elles un parcours sinueux irrégulier,
- la paroi de la sole comporte des alvéoles décalées définissant un parcours sinueux pour les produits,
- les alvéoles ont des formes et des profondeurs variables,
- les alvéoles ont des chambres semi-cylindriques destinées à provoquer des tourbillons,
- la sole est à section semi-circulaire,
- la sole est plate,
- il comporte une arête longitudinale dans son fond,
- il comporte une pluralité d'arêtes dans son fond.
- the baffles are defined by partitions carried by the wall forming the sole,
- the partitions extend at least as far as the median longitudinal plane of the furnace,
- the partitions are separated from one another by equal distances so as to constitute baffles defining between them a regular sinuous path for the products,
- the partitions are irregularly spaced apart from each other so as to form baffles defining between them an irregular sinuous path,
- the wall of the sole has staggered cells defining a sinuous path for the products,
- the cells have different shapes and depths,
- the cells have semi-cylindrical chambers intended to cause vortices,
- the sole is of semicircular section,
- the sole is flat,
- it has a longitudinal edge in its bottom,
- it has a plurality of ridges in its bottom.
A titre d'exemple et pour faciliter la compréhension de l'invention on a représenté aux dessins annexés :
-
figure 1 : une vue, en coupe transversale d'un four oscillant de type connu, -
figure 2 : une vue schématique, en coupe transversale d'un premier exemple de réalisation de l'invention, -
figure 3 : une vue schématique, en plan, de lafigure 2 , -
figure 4 : une vue schématique, en coupe transversale, d'une variante de lafigure 2 , -
figure 5 : une vue schématique, en plan, de lafigure 4 , -
figure 6 : une vue schématique, en coupe transversale d'un deuxième exemple de réalisation de l'invention, -
figure 7 : une vue schématique, en plan, d'un troisième exemple de réalisation de l'invention, -
figure 8 : une vue schématique, en plan, d'un quatrième exemple de réalisation de l'invention, -
figure 9 : une vue schématique, en plan, d'un cinquième exemple de réalisation de l'invention, -
figure 10 : une vue schématique, en plan, d'un sixième exemple de réalisation de l'invention, -
figure 11 : une vue, en coupe transversale d'un four suivant un septième exemple de réalisation de l'invention, en position médiane, -
figure 12 : une vue du four de lafigure 11 en position inclinée, -
figure 13 : une vue en plan du four de lafigure 11 .
-
figure 1 : a cross-sectional view of an oscillating furnace of known type, -
figure 2 : a schematic cross-sectional view of a first exemplary embodiment of the invention, -
figure 3 : a schematic view, in plan, of thefigure 2 , -
figure 4 : a schematic cross-sectional view of a variant of thefigure 2 , -
figure 5 : a schematic view, in plan, of thefigure 4 , -
figure 6 : a schematic cross-sectional view of a second embodiment of the invention, -
figure 7 : a schematic plan view of a third exemplary embodiment of the invention, -
figure 8 : a schematic plan view of a fourth embodiment of the invention, -
figure 9 : a schematic plan view of a fifth embodiment of the invention, -
figure 10 : a schematic plan view of a sixth exemplary embodiment of the invention, -
figure 11 : a cross-sectional view of a furnace according to a seventh embodiment of the invention, in the middle position, -
figure 12 : a view of the oven from thefigure 11 in an inclined position, -
figure 13 : a plan view of the oven of thefigure 11 .
La
Le four lui-même a un corps tubulaire constitué d'une sole 1, recouverte d'une partie supérieure, ou voûte, 2 dans la paroi duquel sont disposés des moyens de chauffage tels que des brûleurs 3 et des sondes thermiques 4.The furnace itself has a tubular body consisting of a sole 1, covered with an upper part, or arch, 2 in the wall of which are disposed heating means such as
Le corps tubulaire 1-2 est porté par un châssis 5 placé dans un berceau semi-circulaire 6 porté par des galets 7, qui servent à faire osciller le berceau 6.The tubular body 1-2 is carried by a frame 5 placed in a
Comme visible au dessin, la sole 1 dudit four est globalement plate.As visible in the drawing, the sole 1 of said furnace is generally flat.
Les
La sole 1 du four est de section semi-circulaire et est munie de cloisons transversales 10 portées par sa paroi et définissant des chambres de brassage.The sole 1 of the furnace is of semicircular section and is provided with
Dans l'exemple représenté, l'angle α entre les cloisons transversales 10 et la paroi de la sole 1 est égal à 90°, mais il peut être différent, obtus ou aigu. Le cheminement des produits dans le four est dépendant de l'orientation desdites cloisons 10 par rapport à la paroi de la sole. Lorsque lesdites cloisons 10 sont inclinées en direction de l'entrée du four, les produits sont en partie ramenés vers la chambre de brassage disposée en amont ce qui allonge leur temps de parcours dans le four. Inversement, lorsque les cloisons 10 sont inclinées en direction de la sortie du four, une partie des produits peut être amenée à parcourir plus rapidement le four.In the example shown, the angle α between the
Aux
Lesdites cloisons 10 forment des chicanes qui obligent les produits circulant dans le four selon la direction générale du plan médian XX a effectuer un parcours en zigzag A ou B (les zigzags B étant plus accentués que A) lorsque le four oscille d'une chambre située d'un côté du plan médian XX à une chambre située en aval et de l'autre côté du plan médian XX.Said
Bien que cela ne soit pas représenté au dessin, de telles cloisons 10 peuvent équiper un four à fond plat tel que celui représenté à la
Dans l'exemple de réalisation représenté à la
Bien que représentées dans un four à fond plat, de telles arêtes peuvent être également prévues dans un four à section quelconque, par exemple circulaire.Although represented in a flat-bottomed oven, such ridges may also be provided in an oven of any section, for example circular.
En se reportant à la
Suivant une variante de réalisation non représentée au dessin, lorsque la forme en section de la sole le permet, les cloisons 10 sont montées mobiles en rotation par rapport à la paroi de la sole afin de permettre une modification de leur angle d'orientation α en fonction de la production en cours.According to an alternative embodiment not shown in the drawing, when the cross-sectional shape of the hearth allows it, the
Aux
Bien que cela ne soit pas représenté on peut disposer des alvéoles 12 de formes et de profondeur variables, ce qui permet de faire varier la vitesse de progression des produits selon le trajet D.Although this is not shown, it is possible to have
Il est encore possible de disposer des doigts 15 dans l'espace que doivent parcourir les produits afin d'améliorer leur brassage.It is still possible to have the
On peut, de même, dans les exemples des
La
Les
Les cloisons 10 sont disposées comme dans l'exemple de la
Selon cette variante la sole 1 comporte, en plus des cloisons 10 un fond qui n'est pas plat mais qui est muni, en sa partie médiane d'une arête 14 (analogue à celle décrite dans le brevet 79-0040 sus mentionné), arête qui est située dans le plan médian XX.According to this variant the
On voit que les produits 13, qui à la
Les produits sont donc soumis à un double mouvement : ils sont obligés de suivre un parcours sinueux (A, B, C, D, E) qui opère un brassage latéral et ils subissent un brassage de haut en bas en traversant l'arête 14.The products are therefore subjected to a double movement: they are obliged to follow a sinuous course (A, B, C, D, E) which operates a lateral brewing and they undergo a stirring up and down crossing the
Bien que cela ne soit pas représenté on peut également faire varier l'écartement des cloisons 10 entre elles.Although not shown, it is also possible to vary the spacing of the
Les différentes dispositions décrites ci-dessus peuvent être choisies et adaptées à toute forme de sole afin de réguler à volonté la vitesse d'écoulement des produits à travers le four et l'intensité de leur brassage.The various arrangements described above can be chosen and adapted to any shape of sole in order to regulate at will the speed of flow of products through the oven and the intensity of their brewing.
La mise en oeuvre selon l'invention de cloisons qui obligent les produits à parcourir un chemin en zigzag d'une alvéole située sur un côté du four oscillant à une alvéole située sur l'autre côté du four oscillant, favorise le brassage des produits traités dans ledit four et permet d'obtenir un traitement particulièrement homogène de ces produits.The implementation according to the invention of partitions that force the products to travel a zigzag path from a cell located on one side of the oscillating furnace to a cell located on the other side of the oscillating furnace, promotes the mixing of treated products in said furnace and provides a particularly homogeneous treatment of these products.
Claims (12)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0610964A FR2910118A1 (en) | 2006-12-15 | 2006-12-15 | Rocking furnace for cement manufacturing plant, has tubular body comprising upper part carrying heating unit, and sole comprising baffles arranged such that progression of products through furnace follows zigzag path |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1936308A1 true EP1936308A1 (en) | 2008-06-25 |
Family
ID=38292684
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07291458A Withdrawn EP1936308A1 (en) | 2006-12-15 | 2007-12-05 | Rocking furnace with internal baffles |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1936308A1 (en) |
FR (1) | FR2910118A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2484335A (en) * | 2010-10-07 | 2012-04-11 | Ronald Gloudie Sherwen | Rotary heat exchanger |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2484906C1 (en) * | 2010-11-15 | 2013-06-20 | Государственное предприятие "Украинский научно-технический центр металлургической промышленности "Энергосталь" (ГП "УкрНТЦ "Энергосталь") | Thermal detoxication of pesticides |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1897647A (en) * | 1930-12-06 | 1933-02-14 | William Steel Jackson | Method and apparatus for mixing a furnace charge |
DE600058C (en) * | 1932-05-11 | 1934-07-16 | Aeg | Device for batch-wise conveying of rollable goods through an annealing furnace |
FR782963A (en) * | 1933-11-30 | 1935-07-05 | Metallgesellschaft Ag | Pendulum oven |
FR1361940A (en) * | 1963-03-08 | 1964-05-29 | Inclined hearth tunnel kiln and reciprocating rotary motion | |
FR2435681A1 (en) * | 1978-09-06 | 1980-04-04 | Koa Oil Co Ltd | OSCILLATING CALCINATION OVEN |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB256861A (en) * | 1926-01-30 | 1926-08-19 | Fritz Ernest Johannes Enke | Rotary furnace |
GB1397184A (en) * | 1972-02-15 | 1975-06-11 | Commw Scient Ind Res Org | Method and apparatus for transferring heat to or from material |
-
2006
- 2006-12-15 FR FR0610964A patent/FR2910118A1/en active Pending
-
2007
- 2007-12-05 EP EP07291458A patent/EP1936308A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1897647A (en) * | 1930-12-06 | 1933-02-14 | William Steel Jackson | Method and apparatus for mixing a furnace charge |
DE600058C (en) * | 1932-05-11 | 1934-07-16 | Aeg | Device for batch-wise conveying of rollable goods through an annealing furnace |
FR782963A (en) * | 1933-11-30 | 1935-07-05 | Metallgesellschaft Ag | Pendulum oven |
FR1361940A (en) * | 1963-03-08 | 1964-05-29 | Inclined hearth tunnel kiln and reciprocating rotary motion | |
FR2435681A1 (en) * | 1978-09-06 | 1980-04-04 | Koa Oil Co Ltd | OSCILLATING CALCINATION OVEN |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2484335A (en) * | 2010-10-07 | 2012-04-11 | Ronald Gloudie Sherwen | Rotary heat exchanger |
Also Published As
Publication number | Publication date |
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FR2910118A1 (en) | 2008-06-20 |
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