EP1972876A1 - Rotary kiln for drying granulates or other substances such as sand - Google Patents

Rotary kiln for drying granulates or other substances such as sand Download PDF

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Publication number
EP1972876A1
EP1972876A1 EP07006015A EP07006015A EP1972876A1 EP 1972876 A1 EP1972876 A1 EP 1972876A1 EP 07006015 A EP07006015 A EP 07006015A EP 07006015 A EP07006015 A EP 07006015A EP 1972876 A1 EP1972876 A1 EP 1972876A1
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EP
European Patent Office
Prior art keywords
enclosure
rotary kiln
vanes
longitudinal axis
pivoting
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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Withdrawn
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EP07006015A
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German (de)
French (fr)
Inventor
Antoine Carrasco
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Argumat SAS
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Argumat SAS
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Publication date
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Priority to EP07006015A priority Critical patent/EP1972876A1/en
Publication of EP1972876A1 publication Critical patent/EP1972876A1/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
    • F26B11/0477—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/14—Sand

Definitions

  • the present invention relates to a rotary kiln for drying aggregates or other substances such as sand.
  • the current rotary kilns for drying aggregates or sand are in the form of a cylindrical chamber rotatably mounted about its axis, each of whose ends respectively forms the inlet and the outlet of the cold and wet materials to be dried and comprise a burner generating a flame at the outlet of the cylindrical chamber which emits a hot air flow in the countercurrent enclosure of the flow of materials from the inlet of the enclosure to said outlet.
  • the cylindrical enclosure contains a drying zone equipped with lifting blades whose function is to raise the materials to be dried in order to drop them, in the form of a curtain, with homogeneity over the entire internal surface of the cylinder in said zone. drying so as to obtain the best possible exchange by convection with the hot air flow generated by the flame of the burner.
  • the efficiency of these rotary drying ovens which is mainly due to the convection exchange with the hot air flow varies depending on the production rate and / or the burner power, which results in significant temperature differences.
  • the drying ovens comprise equipment and bag filters which are arranged downstream of their outlet and which must not operate on the one hand under conditions of temperature where the air is saturated with water vapor. that is to say at temperatures below about 80 ° Celsius corresponding to the dew point and secondly to high temperatures, above 190 ° Celsius, causing the destruction of the fabrics constituting the bag filters.
  • the object of the present invention is to remedy these drawbacks by proposing a rotary kiln for drying aggregates or other substances such as sand equipped with a charge control system making it possible to limit the temperature differences obtained at the outlet of the enclosure drying with high and low temperatures respectively lower than the maximum temperature of fabric resistance of the bag filters and greater than the dew point temperature.
  • the rotary kiln for drying aggregates or other substances such as sand is in the form of a cylindrical enclosure rotated about its longitudinal axis, each of the ends of which respectively forms the inlet and the outlet of the materials. cold and wet to dry in said enclosure and comprises a burner generating a flame at the outlet of the enclosure which emits a hot air flow in the chamber against the flow of materials and contains a drying zone comprising blades, intended for lifting materials, secured radially to the inner face of the chamber and is essentially characterized in that the pivoting vanes are equipped with rotation means associated with control means for adjusting the direction and degree of the inclination of said pivoting vanes with respect to the longitudinal axis of the enclosure so as to modify the quantity of materials raised and / or the speed of said materials taken up in said drying zone.
  • the degree of inclination or opening of the pivoting vanes makes it possible to let more or less material pass through the drying zone and to regulate the temperature at the outlet of said enclosure which depends on the density of the flow of materials in the chamber relative to the hot air flow generated by the burner in order to meet the resistance constraints at certain temperatures of the bag filters and the various equipment equipping the rotary kiln.
  • the pivoting vanes will be rotatably mounted about a pivot axis perpendicular to the inner face and the longitudinal axis of the enclosure.
  • At least one cross section of the inner wall of the enclosure will comprise pivoting vanes successively distributed along said section so as to obtain a closed configuration of said vanes when they are contiguous and will form a right angle with the longitudinal axis of the enclosure and an open configuration of said blades when they form a certain angle with the longitudinal axis of the enclosure.
  • the blades will be pivotally controlled independently of each other, each at a control point located outside the enclosure and extending inside the enclosure by the pivot axis of the dawn.
  • the blades will be pivotally controlled simultaneously by connecting means connecting the pivot axes of the blades at a single control point located outside the enclosure.
  • the connecting means consist for example of a set of rods ensuring the transmission of the rotation of the pivot axes from the control point.
  • the control points will be in the form of a handle for manually operating all the blades.
  • the pivot axes can be electrically controlled in rotation by means of a motor.
  • the electrical control can be integrated in an electronic control system associated with temperature sensors for automatically controlling and controlling the degree and direction of the inclination of the blades according to the air temperature measured at the outlet of the oven by said sensors.
  • a rotary drying oven 1 comprises on the one hand a cylindrical enclosure 10 rotatably mounted about its longitudinal axis 10 'whose one end 11 is designed to receive the input of the materials cold and wet to dry in the chamber 10 which are discharged at the outlet of the cylinder 10 at its other end 12 and secondly a burner 2 generating a flame 20 inside the enclosure 10 at its outlet end 12 of the materials, which flame 20 produces a flow of hot air 21 which is directed towards the other end 11 of the enclosure against the flow of the material stream 13, which hot air stream 21 is discharged from the enclosure 10 through its inlet end 11.
  • the rotary chamber 10 encloses in a drying zone 14 vanes 15 of generally rectangular shape parallel to its longitudinal axis 10 'whose function is to raise the materials to make them fall homogeneously over the entire inner surface of the enclosure under the shape of a curtain 15 'so as to obtain the best possible convective exchange between the materials and the flow of hot air 21 generated by the flame 20 of the burner 2.
  • pivoting vanes 16 successively distributed over a cross section of the circular inner wall 17 of the enclosure 10 are each rotatably mounted about an axis 16 'perpendicular to the inner wall 17 and to the longitudinal axis 10 'of the enclosure 10 this in order to obtain an open configuration of the blades 16 when they are at a certain angle with the longitudinal axis 10' of the enclosure for example 45 °, as can be seen on the figure 1 , or a closed configuration when contiguous at a right angle to the longitudinal axis 10 'of the enclosure 10, as can be seen in FIG. figure 2 .
  • the maximum load of the materials in the enclosure 10 is obtained when the pivoting vanes 16 are in closed configuration ( figure 1 ) while the minimum load in the enclosure 10 is obtained when they are in open configuration by forming an angle of zero degrees with the longitudinal axis 10 'of the enclosure 10 ( figure 2 ).
  • Controlling the rotation of the pivoting vanes 16 changing their inclination with respect to the longitudinal axis 10 ' is effected by means of handles 18 secured to the outer face of the enclosure 10 and each extending inside the latter by the pivot axis 16' of the corresponding pivoting blade 16 which allows act individually and manually on each pivoting blade 16 from outside the enclosure 10.
  • the adjustment of the load of the flow of materials 13 in the enclosure 10 is thus achieved by intervening on the degree of inclination of the swivel vanes 16 which makes it possible to control the temperature at the outlet of the rotary kiln 1 in order to preserve the materials and in particular the bag filters, which are arranged downstream of the exit of the rotary kiln 1 and which must not function on the one hand under conditions where the temperature is below about 80 ° Celsius corresponding to the dew point and secondly under conditions where the temperature is above about 190 ° Celsius resulting in the destruction of the fabrics constituting the bag filters.
  • the control of the rotation of the vanes could be facilitated by replacing the handles 18 by means of motorized action for controlling, with the help of pushbuttons creating an electrical contact, the rotation of the pivot axes 16 'of the swivel vanes 16 .
  • the pivoting blades 16 ' may be interconnected by connecting means such as links for controlling the rotation of the pivot axes from a single control point.
  • Electric control may also be associated with a control electronics that can be controlled by the temperature measured at the output of the rotary kiln 1 by means of temperature sensors so as to automatically comply with the aforementioned temperature constraints.
  • the number of blades constituting the load control device will be determined according to the diameter of the cylindrical chamber and the space available therein.
  • the rotary kiln according to the present invention therefore makes it possible to regulate the curtain of material in the drying zone by simply modifying the amount of material raised and hence the density of the curtain with respect to the hot air in the enclosure so as to obtain a temperature of the gases leaving the enclosure of the rotary kiln between about 90 ° C and 190 ° C avoiding any degradation of equipment and bag filters.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The kiln (1) has a cylindrical enclosure (10) mounted in rotation around a longitudinal axis (10') of the enclosure. The enclosure has a burner (2) generating a flame (20) at the level of an outlet end (12) of the burner. The enclosure surrounds a drying zone (14) with blades (15) lifting materials (13), where the blades are radially integrated to an internal face of the enclosure. Pivoting blades (16) has handles (18) for adjusting direction and degree of inclination of the blades (16) relative to the axis to modify quantity and speed of the raised materials in the drying zone.

Description

La présente invention a pour objet un four rotatif de séchage des granulats ou autres substances tels que du sable.The present invention relates to a rotary kiln for drying aggregates or other substances such as sand.

Les fours rotatifs actuels de séchage de granulats ou de sable se présentent sous la forme d'une enceinte cylindrique montée en rotation autour de son axe dont chacune des extrémités forme respectivement l'entrée et la sortie des matériaux froids et humides à sécher et comprennent un brûleur générant une flamme au niveau de la sortie de l'enceinte cylindrique qui émet un flux d'air chaud dans l'enceinte à contre courant du flux des matériaux acheminés depuis l'entrée de l'enceinte vers ladite sortie. L'enceinte cylindrique renferme une zone de séchage équipée d'aubes de relevage dont la fonction est de relever les matériaux à sécher pour les faire chuter, sous la forme d'un rideau, avec homogénéité sur toute la surface interne du cylindre dans ladite zone de séchage de manière à obtenir le meilleur échange possible par convection avec le flux d'air chaud généré par la flamme du brûleur.The current rotary kilns for drying aggregates or sand are in the form of a cylindrical chamber rotatably mounted about its axis, each of whose ends respectively forms the inlet and the outlet of the cold and wet materials to be dried and comprise a burner generating a flame at the outlet of the cylindrical chamber which emits a hot air flow in the countercurrent enclosure of the flow of materials from the inlet of the enclosure to said outlet. The cylindrical enclosure contains a drying zone equipped with lifting blades whose function is to raise the materials to be dried in order to drop them, in the form of a curtain, with homogeneity over the entire internal surface of the cylinder in said zone. drying so as to obtain the best possible exchange by convection with the hot air flow generated by the flame of the burner.

Toutefois, le rendement de ces fours rotatifs de séchage qui est essentiellement du à l'échange par convection avec le flux d'air chaud varie en fonction du débit de production et/ou de la puissance du brûleur ce qui entraîne des écarts de température importants en sortie du four de séchage avec notamment des températures basse et haute respectivement de l'ordre de 50°Celsius et 190°Celsius. Or, les fours de séchage comprennent des matériels et des filtres à manches qui sont disposés en aval de leur sortie et qui ne doivent pas fonctionner d'une part dans des conditions de température où l'air est saturé de vapeur d'eau c'est-à-dire à des températures inférieures à environ 80°Celsius correspondant au point de rosée et d'autre part à des températures élevées, supérieures à 190° celsius, entraînant la destruction des tissus constituant les filtres à manche.However, the efficiency of these rotary drying ovens which is mainly due to the convection exchange with the hot air flow varies depending on the production rate and / or the burner power, which results in significant temperature differences. at the outlet of the drying oven with in particular low and high temperatures respectively of the order of 50 ° Celsius and 190 ° Celsius. However, the drying ovens comprise equipment and bag filters which are arranged downstream of their outlet and which must not operate on the one hand under conditions of temperature where the air is saturated with water vapor. that is to say at temperatures below about 80 ° Celsius corresponding to the dew point and secondly to high temperatures, above 190 ° Celsius, causing the destruction of the fabrics constituting the bag filters.

La présente invention a pour but de remédier à ces inconvénients en proposant un four rotatif de séchage de granulats ou autre substances tels que du sable équipé d'un système de régulation de charge permettant de limiter les écarts de température obtenus en sortie de l'enceinte de séchage avec des températures haute et basse respectivement inférieure à la température maximale de résistance des tissus des filtres à manche et supérieure à la température de point de rosée.The object of the present invention is to remedy these drawbacks by proposing a rotary kiln for drying aggregates or other substances such as sand equipped with a charge control system making it possible to limit the temperature differences obtained at the outlet of the enclosure drying with high and low temperatures respectively lower than the maximum temperature of fabric resistance of the bag filters and greater than the dew point temperature.

Le four rotatif de séchage des granulats ou autres substances tels que du sable selon la présente invention se présente sous la forme d'une enceinte cylindrique montée en rotation autour de son axe longitudinal dont chacune des extrémités forme respectivement l'entrée et la sortie des matériaux froids et humides à sécher dans ladite enceinte et comprend un brûleur générant une flamme au niveau de la sortie de l'enceinte qui émet un flux d'air chaud dans l'enceinte à contre courant du flux des matériaux et renferme une zone de séchage comportant des aubes, destinées au relevage des matériaux, solidarisées radialement à la face interne de l'enceinte et se caractérise essentiellement en ce des aubes pivotantes sont équipées de moyens de rotation associés à des moyens de commande permettant de régler le sens et le degré de l'inclinaison desdites aubes pivotantes par rapport à l'axe longitudinal de l'enceinte de manière à modifier la quantité de matériaux relevés et/ou la vitesse desdits matériaux relevés dans ladite zone de séchage.The rotary kiln for drying aggregates or other substances such as sand according to the present invention is in the form of a cylindrical enclosure rotated about its longitudinal axis, each of the ends of which respectively forms the inlet and the outlet of the materials. cold and wet to dry in said enclosure and comprises a burner generating a flame at the outlet of the enclosure which emits a hot air flow in the chamber against the flow of materials and contains a drying zone comprising blades, intended for lifting materials, secured radially to the inner face of the chamber and is essentially characterized in that the pivoting vanes are equipped with rotation means associated with control means for adjusting the direction and degree of the inclination of said pivoting vanes with respect to the longitudinal axis of the enclosure so as to modify the quantity of materials raised and / or the speed of said materials taken up in said drying zone.

Ainsi le degré d'inclinaison ou d'ouverture des aubes pivotantes permet de laisser passer une quantité plus ou moins importante de matériaux dans la zone de séchage et de réguler la température en sortie de ladite enceinte qui dépend de la densité du flux de matériaux dans l'enceinte par rapport au flux d'air chaud généré par le brûleur ceci afin de répondre aux contraintes de résistance à certaines températures des filtres à manche et des différents matériels équipant le four rotatif.Thus, the degree of inclination or opening of the pivoting vanes makes it possible to let more or less material pass through the drying zone and to regulate the temperature at the outlet of said enclosure which depends on the density of the flow of materials in the chamber relative to the hot air flow generated by the burner in order to meet the resistance constraints at certain temperatures of the bag filters and the various equipment equipping the rotary kiln.

Conformément à la présente invention les aubes pivotantes seront montées en rotation autour d'un axe de pivotement perpendiculaire à la face interne et à l'axe longitudinal de l'enceinte.According to the present invention the pivoting vanes will be rotatably mounted about a pivot axis perpendicular to the inner face and the longitudinal axis of the enclosure.

Toujours conformément à la présente invention au moins une section transversale de la paroi interne de l'enceinte comportera des aubes pivotantes réparties successivement le long de ladite section de manière à obtenir une configuration fermée desdites aubes lorsqu'elles seront jointives et formeront un angle droit avec l'axe longitudinal de l'enceinte et une configuration ouverte desdites aubes lorsqu'elles formeront un certain angle avec l'axe longitudinal de l'enceinte.Still according to the present invention at least one cross section of the inner wall of the enclosure will comprise pivoting vanes successively distributed along said section so as to obtain a closed configuration of said vanes when they are contiguous and will form a right angle with the longitudinal axis of the enclosure and an open configuration of said blades when they form a certain angle with the longitudinal axis of the enclosure.

Dans un mode de réalisation de la présente invention les aubes seront commandées en pivotement indépendamment l'une de l'autre, chacune en un point de commande situé à l'extérieur de l'enceinte et se prolongeant à l'intérieur de cette dernière par l'axe de pivotement de l'aube.In one embodiment of the present invention the blades will be pivotally controlled independently of each other, each at a control point located outside the enclosure and extending inside the enclosure by the pivot axis of the dawn.

Dans un autre mode de réalisation de la présente invention les aubes seront commandées en pivotement simultanément grâce à des moyens de liaison reliant les axes de pivotement des aubes en un seul point de commande situé à l'extérieur de l'enceinte. Les moyens de liaison consisteront par exemple en un jeu de biellettes assurant la transmission de la rotation des axes de pivotement depuis le point de commande.In another embodiment of the present invention the blades will be pivotally controlled simultaneously by connecting means connecting the pivot axes of the blades at a single control point located outside the enclosure. The connecting means consist for example of a set of rods ensuring the transmission of the rotation of the pivot axes from the control point.

Les points de commande se présenteront sous la forme d'une poignée permettant d'actionner manuellement l'ensemble des aubes.The control points will be in the form of a handle for manually operating all the blades.

Les axes de pivotement pourront être commandés électriquement en rotation par l'intermédiaire d'un moteur. La commande électrique pourra être intégrée dans un système de commande électronique associée à des capteurs de température permettant de contrôler et de commander automatiquement le degré et le sens de l'inclinaison des aubes en fonction de la température de l'air mesurée en sortie du four par lesdits capteurs.The pivot axes can be electrically controlled in rotation by means of a motor. The electrical control can be integrated in an electronic control system associated with temperature sensors for automatically controlling and controlling the degree and direction of the inclination of the blades according to the air temperature measured at the outlet of the oven by said sensors.

Les avantages et les caractéristiques de la présente invention ressortiront plus clairement de la description qui suit et qui se rapportent au dessin annexé, lequel en représente un mode de réalisation non limitatif.

  • la figure 1 représente une vue de profil de l'intérieur de l'enceinte cylindrique d'un four rotatif de séchage selon la présente invention en configuration ouverte des aubes pivotantes réparties sur une section transversale de l'enceinte
  • la figure 2 représente une vue de profil de l'intérieur de l'enceinte cylindrique d'un four rotatif de séchage selon la présentation en configuration fermée des aubes pivotantes réparties sur une section transversale de l'enceinte
The advantages and features of the present invention will emerge more clearly from the description which follows and which relate to the appended drawing, which represents a non-limiting embodiment thereof.
  • the figure 1 represents a profile view of the interior of the cylindrical chamber of a rotary kiln of drying according to the present invention in open configuration of the pivoting vanes distributed over a cross section of the enclosure
  • the figure 2 represents a profile view of the interior of the cylindrical enclosure of a rotary kiln according to the closed configuration presentation of the pivoting vanes distributed over a cross section of the enclosure

Si on se réfère à la figure 1 on peut voir qu'un four rotatif de séchage 1 selon la présente invention comprend d'une part une enceinte cylindrique 10 montée en rotation autour de son axe longitudinal 10' dont l'une des extrémités 11 est conçue pour recevoir l'entrée des matériaux froids et humides à sécher dans l'enceinte 10 qui sont évacués en sortie du cylindre 10 à son autre extrémité 12 et d'autre part un brûleur 2 générant une flamme 20 à l'intérieur de l'enceinte 10 au niveau de son extrémité de sortie 12 des matériaux, laquelle flamme 20 produit un flux d'air chaud 21 qui est orientée vers l'autre extrémité 11 de l'enceinte 10 à contre courant du flux de matériaux 13, lequel flux d'air chaud 21 est évacué de l'enceinte 10 par son extrémité d'entrée 11.If we refer to the figure 1 it can be seen that a rotary drying oven 1 according to the present invention comprises on the one hand a cylindrical enclosure 10 rotatably mounted about its longitudinal axis 10 'whose one end 11 is designed to receive the input of the materials cold and wet to dry in the chamber 10 which are discharged at the outlet of the cylinder 10 at its other end 12 and secondly a burner 2 generating a flame 20 inside the enclosure 10 at its outlet end 12 of the materials, which flame 20 produces a flow of hot air 21 which is directed towards the other end 11 of the enclosure Against the flow of the material stream 13, which hot air stream 21 is discharged from the enclosure 10 through its inlet end 11.

L'enceinte rotative 10 renferme dans une zone de séchage 14 des aubes 15 de forme globalement rectangulaire parallèles à son axe longitudinal 10' qui ont pour fonction de relever les matériaux pour les faire chuter avec homogénéité sur toute la surface intérieure de l'enceinte sous la forme d'un rideau 15' de manière à obtenir le meilleur échange possible par convection entre les matériaux et le flux d'air chaud 21 généré par la flamme 20 du brûleur 2.The rotary chamber 10 encloses in a drying zone 14 vanes 15 of generally rectangular shape parallel to its longitudinal axis 10 'whose function is to raise the materials to make them fall homogeneously over the entire inner surface of the enclosure under the shape of a curtain 15 'so as to obtain the best possible convective exchange between the materials and the flow of hot air 21 generated by the flame 20 of the burner 2.

On peut voir également que des aubes pivotante 16 réparties successivement sur une section transversale de la paroi interne circulaire 17 de l'enceinte 10 sont montées chacune en rotation autour d'un axe 16' perpendiculaire à la paroi interne 17 et à l'axe longitudinal 10' de l'enceinte 10 ceci dans le but d'obtenir une configuration ouverte des aubes 16 lorsqu'elles font un certain angle avec l'axe longitudinal 10' de l'enceinte par exemple de 45°, comme on peut le voir sur la figure 1, ou une configuration fermée lorsqu'elles sont jointives en faisant un angle droit avec l'axe longitudinal 10' de l'enceinte 10, comme on peut le voir sur la figure 2.It can also be seen that pivoting vanes 16 successively distributed over a cross section of the circular inner wall 17 of the enclosure 10 are each rotatably mounted about an axis 16 'perpendicular to the inner wall 17 and to the longitudinal axis 10 'of the enclosure 10 this in order to obtain an open configuration of the blades 16 when they are at a certain angle with the longitudinal axis 10' of the enclosure for example 45 °, as can be seen on the figure 1 , or a closed configuration when contiguous at a right angle to the longitudinal axis 10 'of the enclosure 10, as can be seen in FIG. figure 2 .

Ainsi, la charge maximale des matériaux dans l'enceinte 10 est obtenue lorsque les aubes pivotantes 16 se trouvent en configuration fermée (figure 1) tandis que la charge minimale dans l'enceinte 10 est obtenue lorsqu'elles se trouvent en configuration ouverte en formant un angle de zéro degré avec l'axe longitudinal 10' de l'enceinte 10 (figure 2).Thus, the maximum load of the materials in the enclosure 10 is obtained when the pivoting vanes 16 are in closed configuration ( figure 1 ) while the minimum load in the enclosure 10 is obtained when they are in open configuration by forming an angle of zero degrees with the longitudinal axis 10 'of the enclosure 10 ( figure 2 ).

La commande de la rotation des aubes pivotantes 16 modifiant leur inclinaison par rapport à l'axe longitudinal 10' est effectuée au moyen de poignées 18 solidarisées à la face externe de l'enceinte 10 et se prolongeant chacune à l'intérieur de cette dernière par l'axe de pivotement 16' de l'aube pivotante 16 correspondante ce qui permet d'agir individuellement et manuellement sur chaque aube pivotante 16 depuis l'extérieur de l'enceinte 10.Controlling the rotation of the pivoting vanes 16 changing their inclination with respect to the longitudinal axis 10 'is effected by means of handles 18 secured to the outer face of the enclosure 10 and each extending inside the latter by the pivot axis 16' of the corresponding pivoting blade 16 which allows act individually and manually on each pivoting blade 16 from outside the enclosure 10.

Le réglage de la charge du flux de matériaux 13 dans l'enceinte 10 est donc réalisé en intervenant sur le degré d'inclinaison des aubes pivotantes 16 ce qui permet de contrôler la température en sortie du four rotatif 1 afin de préserver les matériels et notamment les filtres à manches, qui sont disposés en aval de la sortie du four rotatif 1 et qui ne doivent pas fonctionner d'une part dans des conditions où la température est inférieure à environ 80°Celsius correspondant au point de rosée et d'autre part dans des conditions où la température est supérieure à environ 190°Celsius entraînant la destruction des tissus constituant les filtres à manche.The adjustment of the load of the flow of materials 13 in the enclosure 10 is thus achieved by intervening on the degree of inclination of the swivel vanes 16 which makes it possible to control the temperature at the outlet of the rotary kiln 1 in order to preserve the materials and in particular the bag filters, which are arranged downstream of the exit of the rotary kiln 1 and which must not function on the one hand under conditions where the temperature is below about 80 ° Celsius corresponding to the dew point and secondly under conditions where the temperature is above about 190 ° Celsius resulting in the destruction of the fabrics constituting the bag filters.

Par ailleurs si l'on considère un sens positif de la rotation des aubes pivotantes 16 c'est-à-dire dans un sens inverse des aiguilles d'une montre le fait que l'aube forme avec l'axe longitudinal 10' un angle aigu ou obtus permettra respectivement d'accélérer ou de ralentir le flux des matériaux, la vitesse dudit flux ayant également un impact sur la température de l'air dans l'enceinte.On the other hand, if we consider a positive direction of the rotation of the pivoting blades 16, that is to say in a counterclockwise direction, the fact that the blade forms with the longitudinal axis 10 'an angle acute or obtuse respectively accelerate or slow down the flow of materials, the speed of said flow also having an impact on the temperature of the air in the enclosure.

La commande de la rotation des aubes pourrait être facilitée en remplaçant les poignées 18 par des moyens d'action motorisés permettant de commander, à l'aide de boutons poussoirs créant un contact électrique, la rotation des axes de pivotement 16' des aubes pivotantes 16.The control of the rotation of the vanes could be facilitated by replacing the handles 18 by means of motorized action for controlling, with the help of pushbuttons creating an electrical contact, the rotation of the pivot axes 16 'of the swivel vanes 16 .

Les aubes pivotantes 16' pourront être reliées entre elles par des moyens de liaison tels que des biellettes permettant de commander la rotation des axes de pivotement à partir d'un seul point de commande. La commande électrique pourra également être associée à une électronique de commande qui pourra être asservie à la température mesurée en sortie du four rotatif 1 grâce à des capteurs de température de manière à respecter automatiquement les contraintes de température précités.The pivoting blades 16 'may be interconnected by connecting means such as links for controlling the rotation of the pivot axes from a single control point. Electric control may also be associated with a control electronics that can be controlled by the temperature measured at the output of the rotary kiln 1 by means of temperature sensors so as to automatically comply with the aforementioned temperature constraints.

On notera que le nombre d'aubes constituant le dispositif de réglage de la charge sera déterminé en fonction du diamètre de l'enceinte cylindrique et de la place disponible dans celle-ci.Note that the number of blades constituting the load control device will be determined according to the diameter of the cylindrical chamber and the space available therein.

Le four rotatif selon la présente invention permet donc de réguler le rideau de matériau dans la zone de séchage en modifiant simplement la quantité de matériaux relevés et partant la densité du rideau par rapport à l'air chaud dans l'enceinte de manière à-obtenir une température des gaz en sortie de l'enceinte du four rotatif comprise entre environ 90°C et 190°C évitant toute dégradation des matériels et des filtres à manche.The rotary kiln according to the present invention therefore makes it possible to regulate the curtain of material in the drying zone by simply modifying the amount of material raised and hence the density of the curtain with respect to the hot air in the enclosure so as to obtain a temperature of the gases leaving the enclosure of the rotary kiln between about 90 ° C and 190 ° C avoiding any degradation of equipment and bag filters.

Claims (9)

Four rotatif (1) de séchage des granulats ou autres substances tels que du sable se présentant sous la forme d'une enceinte (10) cylindrique montée en rotation autour de son axe longitudinal (10') dont chacune des extrémités (11,12) forme respectivement l'entrée (11) et la sortie (12) des matériaux froids et humides à sécher dans ladite enceinte (10) et comprend un brûleur (2) générant une flamme (20) au niveau de la sortie (12) de l'enceinte (10) qui émet un flux d'air chaud (21) dans l'enceinte (10) à contre courant du flux des matériaux (13) et renferme une zone de séchage (14) comportant des aubes (15), destinées au relevage des matériaux, solidarisées radialement à la face interne de l'enceinte (10) caractérisé en ce qu'il comprend des aubes pivotantes (16) équipées de moyens de rotation (16') et de moyens de commande (18) permettant de régler le sens et le degré de l'inclinaison desdites aubes pivotantes (16) par rapport à l'axe longitudinal (10') de l'enceinte (10) de manière à modifier la quantité de matériaux relevés et/ou la vitesse desdits matériaux relevés dans ladite zone de séchage(14).Rotary kiln (1) for drying aggregates or other substances such as sand in the form of a cylindrical enclosure (10) rotatably mounted around its longitudinal axis (10 '), each of whose ends (11, 12) form respectively the inlet (11) and the outlet (12) of cold and wet materials to be dried in said enclosure (10) and comprises a burner (2) generating a flame (20) at the outlet (12) of the enclosure (10) which emits a flow of hot air (21) into the enclosure (10) against the current of the flow of materials (13) and encloses a drying zone (14) comprising vanes (15) for lifting the materials, secured radially to the inner face of the enclosure (10) characterized in that it comprises pivoting vanes (16) equipped with rotation means (16 ') and control means (18) allowing adjusting the direction and degree of the inclination of said swivel vanes (16) with respect to the longitudinal axis (10 ') of the enclosure (10) so as to modify the amount of material raised and / or the speed of said material taken up in said drying zone (14). Four rotatif (1) selon la présente invention caractérisé en ce que les aubes pivotantes (16) sont montées en rotation autour d'un axe de pivotement (16') perpendiculaire à la face interne de l'enceinte (10) et à l'axe longitudinal (10') de cette dernière.Rotary kiln (1) according to the present invention characterized in that the swivel vanes (16) are rotatably mounted about a pivot axis (16 ') perpendicular to the internal face of the enclosure (10) and to the longitudinal axis (10 ') of the latter. Four rotatif (1) selon la revendication 2 caractérisé en ce qu'au moins une section transversale de la paroi interne (17) de l'enceinte (10) comporte des aubes pivotantes (16) réparties successivement le long de ladite section an sorte qu'en configuration fermée lesdites aubes pivotantes (16) sont jointives et forment un angle droit avec l'axe longitudinal (10') de l'enceinte (10) et en configuration ouverte lesdites aubes pivotantes (16) forment un angle aigu ou obtus avec l'axe longitudinal (10') de l'enceinte (10).Rotary kiln (1) according to claim 2, characterized in that at least one cross-section of the inner wall (17) of the enclosure (10) comprises pivoting vanes (16) successively distributed along said section so that in closed configuration said pivoting vanes (16) are contiguous and form a right angle with the longitudinal axis (10 ') of the enclosure (10) and in open configuration said pivoting vanes (16) form an acute or obtuse angle with the longitudinal axis (10 ') of the enclosure (10). Four rotatif selon la revendication 2 ou la revendication 3 caractérisé en ce que les aubes pivotantes (16) sont commandées en pivotement indépendamment l'une de l'autre, chacune en un point de commande (18) situé à l'extérieur de l'enceinte (10) et se prolongeant à l'intérieur de ladite enceinte (10) par l'axe de pivotement (16') de l'aube pivotante (16').Rotary kiln according to Claim 2 or Claim 3, characterized in that the swivel vanes (16) are pivotally controlled independently of each other, each at a control point (18) situated outside the housing. enclosure (10) and extending inside said enclosure (10) by the pivot axis (16 ') of the pivoting vane (16'). Four rotatif (1) selon la revendication 2 ou la revendication 3 caractérisé en ce que les aubes pivotantes (16) seront commandées en rotation autour de leur axe de pivotement (16') simultanément grâce à des moyens de liaison reliant les axes de pivotement (16') des aubes pivotantes (16) en un seul point de commande situé à l'extérieur de l'enceinte.Rotary kiln (1) according to claim 2 or claim 3 characterized in that the swivel vanes (16) will be rotated about their pivot axis (16 ') simultaneously by means of connecting means connecting the pivot axes ( 16 ') pivoting vanes (16) at a single control point located outside the enclosure. Four rotatif (1) selon la revendication 5 caractérisé en ce que les moyens de liaisons consistent en un jeu de biellettes assurant la transmission de la rotation des axes de pivotement (16') depuis le point de commande unique.Rotary kiln (1) according to claim 5 characterized in that the connecting means consist of a set of rods ensuring the transmission of the rotation of the pivot axes (16 ') from the single control point. Four rotatif (1) selon l'une quelconque des revendications 4 à 6 caractérisé en ce que les points de commande de la rotation des axes de pivotement (16') des aubes pivotantes (16) se présentent sous la forme d'une poignée.Rotary kiln (1) according to any one of claims 4 to 6 characterized in that the control points of the rotation of the pivot axes (16 ') of the swivel vanes (16) are in the form of a handle. Four rotatif (1) selon l'une quelconque des revendications 4 à 6 caractérisé en ce que les axes de pivotements (16') des aubes pivotantes (16) sont commandés électriquement en rotation.Rotary kiln (1) according to any one of claims 4 to 6 characterized in that the pivot axes (16 ') of the swivel vanes (16) are electrically controlled in rotation. Four rotatif (1) selon la revendication 8 caractérisé en ce que la commande électrique est intégrée dans un système de commande électronique associée à des capteurs de température permettant de contrôler et de commander automatiquement le degré et le sens de l'inclinaison des aubes pivotantes (16) en fonction de la température de l'air mesurée en sortie du four rotatif (1) par lesdits capteurs.Rotary kiln (1) according to claim 8, characterized in that the electrical control is integrated in an electronic control system associated with temperature for controlling and controlling automatically the degree and direction of the inclination of the swivel vanes (16) as a function of the temperature of the air measured at the outlet of the rotary kiln (1) by said sensors.
EP07006015A 2007-03-23 2007-03-23 Rotary kiln for drying granulates or other substances such as sand Withdrawn EP1972876A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07006015A EP1972876A1 (en) 2007-03-23 2007-03-23 Rotary kiln for drying granulates or other substances such as sand

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Application Number Priority Date Filing Date Title
EP07006015A EP1972876A1 (en) 2007-03-23 2007-03-23 Rotary kiln for drying granulates or other substances such as sand

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Publication number Priority date Publication date Assignee Title
CN104990380A (en) * 2015-07-23 2015-10-21 福建南方路面机械有限公司 Aggregate drying drum and drying method for dry-mixed mortar production line
FR3034786A1 (en) * 2015-04-10 2016-10-14 Ermont ROTARY DRUM DRYER HAVING ADJUSTABLE RUNNING BLADES
CN113758183A (en) * 2021-09-03 2021-12-07 泉州市交发泓盛材料科技有限责任公司 Aggregate drying roller and drying method for dry-mixed mortar production line

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DE281645C (en) *
DE497691C (en) * 1927-10-21 1930-05-16 Bernhard Saegebarth Trickle drum for drying, distilling and smoldering muddy masses
US2522025A (en) * 1946-04-09 1950-09-12 Link Belt Co Rotary drier or cooler
DE864079C (en) * 1950-04-29 1953-01-22 Cornel Kremer Storage device for rotary drums
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DE2119645A1 (en) * 1971-04-22 1973-03-29 Claas Maschf Geb Drum dryer - adjustable blade arrangement enables optimum material and heating gas flows to be maintained
FR2179427A5 (en) * 1972-04-03 1973-11-16 Continental Oil Co
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3034786A1 (en) * 2015-04-10 2016-10-14 Ermont ROTARY DRUM DRYER HAVING ADJUSTABLE RUNNING BLADES
CN104990380A (en) * 2015-07-23 2015-10-21 福建南方路面机械有限公司 Aggregate drying drum and drying method for dry-mixed mortar production line
CN104990380B (en) * 2015-07-23 2018-08-10 福建南方路面机械有限公司 Aggregate drying roller and furnace drying method for dry-mixed mortar production line
CN113758183A (en) * 2021-09-03 2021-12-07 泉州市交发泓盛材料科技有限责任公司 Aggregate drying roller and drying method for dry-mixed mortar production line

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