EP2106294B1 - Grain size selection and/or matter drying apparatus - Google Patents

Grain size selection and/or matter drying apparatus Download PDF

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Publication number
EP2106294B1
EP2106294B1 EP07870307A EP07870307A EP2106294B1 EP 2106294 B1 EP2106294 B1 EP 2106294B1 EP 07870307 A EP07870307 A EP 07870307A EP 07870307 A EP07870307 A EP 07870307A EP 2106294 B1 EP2106294 B1 EP 2106294B1
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Prior art keywords
gas
matter
pipe
selector
inlet
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German (de)
French (fr)
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EP2106294A2 (en
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Sébastien DEVROE
Alain Cordonnier
Pascal Marechal
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Fives FCB SA
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Fives FCB SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall

Definitions

  • the present invention relates to an apparatus for granulometric selection and / or material drying, for the suspension treatment of granular mineral materials of which at least 90% by weight have a size less than 60 mm.
  • these devices are not considered granulometric selectors. Indeed, when these devices are loaded with a coarse fraction composed of particles of various diameters, generally, most of the fraction falls, without separation and suspension of the finest particles that compose it.
  • the document device GB-2,193,448 which corresponds to the preamble of claim 1 comprises a substantially vertical pipe, upflow, provided with a gas inlet at its base, equipped with an upper opening through which the fines escape and a lower opening by which drop the coarse materials.
  • the feed of the materials is at a point of introduction between the upper opening and the lower opening.
  • the pipe of the apparatus is equipped with funnels distributed over the height of the pipe, and in particular below the point of introduction, intended to divert the materials of the internal walls of the pipe.
  • This apparatus is also equipped with means for creating a vortex, constituted by fixed propellers, distributed over the height of the pipe.
  • Vertical plates arranged between the funnels and the propellers, are intended to create turbulence allowing the disintegration of agglomerated materials.
  • the object of the present invention is to provide an apparatus for granulometric selection and / or drying of pulverulent materials, for the suspension treatment of granular mineral materials of which at least 90% by weight are less than 60 mm in size, which operates in line and stably for application to materials with a wide particle size spectrum.
  • Another object of the invention is to provide a particle size selection apparatus and / or drying allowing a good separation of fractions, which can be resuspended.
  • Another object of the invention is to provide an apparatus for granulometric selection and / or drying of pulverulent materials, consisting mainly of a vertical gas pipe of small size, especially of height substantially less than the height of the gas pipe. flash type drying apparatus known to those skilled in the art.
  • Another object of the invention is to provide an apparatus for granulometric selection and / or drying of pulverulent materials, operating with the aid of an ascending flow of gas whose speed is much lower than the speed of the upward flow of gas. flash drying apparatus known to those skilled in the art, thus reducing the pressure drop.
  • the apparatus relates to an apparatus for granulometric selection and / or drying of pulverulent materials, for the suspension treatment of granular mineral matter of which at least 90% by weight is less than 60 mm in size, the apparatus consisting mainly of a substantially vertical upflow gas line provided with a gas inlet at its base, equipped with a lower opening and an upper opening between which a supply opening is also provided for the introduction of materials, in which apparatus a part of the material, in particular said fine, can escape with the gas through the upper opening through the lift of said upward flow, while another part of matter, more coarse, is not driven by said gas and falls through the lower opening, the apparatus has, in addition, means for creating turbulence, favorable to the separation of different size fractions and the suspension of the materials, provided at the inner wall of the gas pipe, and located between the lower opening and the supply opening of said pipe.
  • the means for creating turbulence are formed at least in part, by obstacles for the upward gas flow, in the form of generally horizontal blades, fixed against the inner wall of said gas pipe, of length oriented towards the center of the gas pipe, and arranged at least on two successive levels of height, distributed angularly staggered between said at least two successive levels of height, with the possible lateral overlapping areas.
  • the apparatus for selecting granulometric and / or drying pulverulent materials differs from the known "flash" type drying systems, which comprise as a main element for suspending materials, a venturi in the where the speed of the gases is raised between 30 and 40 m / s.
  • the construction of the venturi forces a total height of the device which is 5 to 6 times the value of the diameter of the vertical pipe.
  • the apparatus for granulometric selection and / or drying of pulverulent materials, according to the invention, is intended for the suspension treatment of granular mineral materials of which at least 90% by weight have a size of less than 60 mm.
  • the apparatus consists mainly of a gas pipe 1, substantially vertical, upflow Fa, provided with a gas inlet at its base.
  • This pipe may be of substantially circular elliptical or rectangular section.
  • the form factor that is to say the length / width ratio of the dimensions of the section does not exceed three.
  • This pipe is equipped with a lower opening 2, and an upper opening 3, between which a feed opening 4 is also provided for the introduction of materials.
  • the lower opening 2 can be fed with gas including a plenum 7 also called wind box.
  • Part of the granular mineral matter, in particular so-called “fines”, can escape with the gas through the upper opening 3 thanks to the lift of the upward flow Fa, while another part of the materials, more coarse, is not driven by the gas and falls through the lower opening 2.
  • the apparatus 30 has, in addition, means 5 for creating turbulence, favorable to the separation of the different particle size fractions, as well as to the suspension of the materials, provided at the level of the internal wall of the gas pipe 1 and located between the lower opening 2 and the feed opening 4 of the gas pipe 1.
  • the turbulences allow in particular the separation of the particles of various diameters, a coarse fraction of material, thus allowing the suspension and the evacuation by the upper opening 3 of the so-called “fine” particles of this fraction, and the larger particles fall through the opening 2.
  • the means 5 for creating the turbulences may consist, at least in part, of obstacles for the upward gas flow Fa, located against the inner wall of the gas pipe 1.
  • the obstacles may take the form of generally horizontal blades, whose length is oriented towards the center of the gas pipe 1.
  • the blades can be arranged at least in two successive levels of height, as illustrated in particular in the figure 1 .
  • the blades may be arranged angularly staggered between two successive levels of height, with, where appropriate, lateral overlapping zones, forcing in particular the flow of ascending gas to zigzag between the blades of different levels.
  • the length of each blade can represent between 2 and 30% of the free width of the conduct 1 along the axis of the blade.
  • the sum of the widths of each blade in particular disposed at least at two successive levels of height may represent at least 60% of the peripheral length of the pipe.
  • the sum of the widths of the blades may advantageously be between 120% and 200% of the peripheral length of the pipe.
  • the shape and position of the blades 10 in the gas pipe 1 may be favorable to an accumulation of materials, including stagnant, on top of said blades 10 during operation, to protect said blades against erosion.
  • the blade may be of concave shape on the blade top or may have one or more upper flanges, in particular at the end of blades 13.
  • the end 13 may be protected by a harder material, the pipe 1 may be covered with a material 12 of protection against abrasion.
  • the means 5 for creating turbulence may be constituted, at least in part, by at least one wall gas flow Fp, oriented generally perpendicular to the direction of the ascending flow Fa penetrating notably radially or tangentially in the internal volume of the gas pipe 1 through the wall orifices 8 of said gas pipe 1.
  • the surface sum of the orifices 8 may represent between 15% and 150% of the free section of the pipe 1.
  • the apparatus may have at least one plenum 7 surrounding the lower part of the pipe, for supplying gas to the lower opening 2 of the gas inlet and / or where appropriate the orifices 8 of the walls of the pipe.
  • the gas inlet may consist solely of the lower opening 2.
  • the gas inlet of the pipe is constituted by the lower opening 2 and the wall openings 8.
  • the gas supply is constituted solely by the wall orifices 8.
  • the plenum 7 can be in the form of a box having an evacuation outlet 9 for falling materials, as illustrated in particular in FIG. figure 1 or 2 .
  • the plenum 7 can be supplied with gas via at least one radial gas inlet 6, 6-1 and / or at least one tangential gas inlet 6-2, 6-3.
  • the plenum chamber 7 is fed by one or two radial inlets 6; 6, 6-1.
  • the plenum chamber 7 is fed by one or two tangential inlets 6-2; 6-2, 6-3.
  • the exemplary embodiment illustrated in figure 1 comprises mainly a gas pipe 1 having an upper opening 3, a lower opening 2 also constituting a main gas inlet.
  • the means 5 for creating turbulence are constituted, on the one hand, by obstacles constituted by blades 10, distributed in several successive height levels and angularly arranged in staggered rows in two successive levels of height, and on the other hand, by wall openings 8 passing through the wall gas flows Fp.
  • a single plenum will surround the lower part of the pipe and can supply gas, on the one hand, the orifices 8, and on the other hand the lower opening 2.
  • This apparatus can be implemented with a gas pipe whose length does not exceed 4 to 5 times the value of the diameter.
  • the speed of the upward flow of gas can be 15 m / s.
  • the topics have a maximum grain size of 100 mm at a specific concentration of between 5 and 6 kg / kg of gas.
  • the installation can operate without instability and selects materials such that only particles smaller than about 0.8 mm are flown and particles larger than about 2 mm fall.
  • the resulting pressure drop is of the order of 60% compared to the "flash" type drying system known from the state of the art for the same flow of material.
  • the example of figure 2 differs from the example of the figure 1 in that the lower opening 2 is of smaller diameter than the largest section of the gas pipe 1, formed at the end of a truncated cone.
  • figure 3 describes an apparatus in which all the gases are introduced through the wall openings 8 and not through the lower opening 2.
  • the sum of the wall flows Fp then allows the creation of the upflow Fa.
  • the wall orifices 8 are located , in large part, below the level of blades 10 constituting obstacles for the upward flow Fa.
  • the raw material fed into the apparatus forming the subject of the invention has a particle size such that 50% of the grains are smaller (or greater) than 3.2 mm with 10% greater than a mesh of 15 mm and a maximum size of 35 mm. mm.
  • the specific feed rate is 5 to 6 kg / kg of gas.
  • the material flown to the exit 3 has a particle size such that almost all the grains have a size less than 7 mm with 50% lower (or higher) than 0.48 mm.
  • the material falling through the lower opening 2 is such that almost all the grains have a size greater than 0.15 mm with 50% lower (or higher) than 5 mm.
  • the separation curve that expresses the split ratio between the two streams for each grain size has a steep slope between grain sizes of 0.7 mm where only 20% of the material falls back and 3 mm where 90% of the materials fall back. This steep slope expresses a high power of selection.
  • the invention will also relate to a drying installation comprising an apparatus according to the invention, the gas inlet of which is fed by a source of gas in temperature.
  • the figure 6 Non-exhaustively illustrates a grinding plant incorporating a device 30 for selecting granulometric and drying. This facility processes materials 17, 18 at least one of which is wet.
  • the plant which processes the materials comprises a grinder 15, a dynamic selector 16, a filter 21 which collects the ground finished product, and material handling means such as a bucket chain or other conveyors, as well as ventilation means for the gases.
  • This plant receives hot gases from an undescribed source.
  • the material feed 17 feeds the mill 15, and the product 19 leaving the mill is fed to the selector 16.
  • the fine fraction is the finished product collected at 21 and the coarse fraction is returned to the mill.
  • the hot gases 20 feed the mill 15, the dryer selector 22 and the dynamic selector 16.
  • the particle size selection and drying apparatus 30 is located on the path of the gas supplying the dynamic selector 16 to which it is connected via its gas line 1.
  • the apparatus receives the hot gases through the inlet 6 and is fed by a supply of material 18 to perform the drying more effectively than if this material was fed directly to the mill 15.
  • the thinnest fraction continues to the dynamic selector 16 in the gas path while the coarse fraction returns through the outlet 9 to the mill 15 at the same time as the rejection 23 of the selector.
  • the refusal can be carried out by a refusal line 23 'of the dynamic selector 16 disposed internally to the gas line 1 of the apparatus 30 of the dryer selector 22, said refusal line 23' opening below or at near the exit 9 of said selector dryer 22.
  • the selector dryer 22 can make it possible to select the material whose grain size is less than about one millimeter, the dynamic selector 16 allowing the selection of material whose grain size is less than one hundred or even ten micrometers.
  • the particle size selection operated by the apparatus 22 avoids both the dynamic selector 16 to be overloaded in coarse fractions from the suspension drying step of a conventional "flash" type system, and the grinder 15. be overloaded in fine fractions if the new material supplied by the feed 18 contains a significant amount. If the drying capacity of the mill 15 is low, the material 19 leaving the mill can be divided into two streams 19-1 and 19-2, the second being again subjected to the fast drying step.

Landscapes

  • Drying Of Solid Materials (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Glanulating (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Crushing And Grinding (AREA)

Abstract

Apparatus for drying mineral particles comprises a vertical upflow pipe (1) with a bottom inlet for gas, a side inlet (4) for the particles, a top outlet (3) for gas and entrained fines, a bottom outlet (2) for coarser particles, and turbulence-creating baffles (5) between the bottom outlet and the side inlet. An independent claim is also included for a continuous grinding plant of the closed circuit type, comprising a grinder, drying apparatus as above in which the coarser particles are recycled to the grinder, a separator for removing oversize particles from and recycling them to the grinder, and a filter for separating fine product particles from the gas.

Description

La présente invention concerne un appareil de sélection granulométrique et/ou de séchage de matière, destiné au traitement en suspension de matières minérales en grains dont au moins 90 % en poids ont une taille inférieure à 60 mm.The present invention relates to an apparatus for granulometric selection and / or material drying, for the suspension treatment of granular mineral materials of which at least 90% by weight have a size less than 60 mm.

Dans les ateliers de broyage et/ou de séchage de matières minérales, il est connu d'utiliser des appareils de séchage en suspension « en ligne » qui s'appliquent à des matières dont la granulométrie moyenne est inférieure à 10 mm. Ces appareils dans lesquels l'échange thermique est massique, via le séchage, et est très rapide, sont souvent qualifiés de « flash ». De tels systèmes qui se présentent sous forme d'un aménagement d'une conduite verticale de gaz chauds ont été décrits dans des publications et notamment B.Reinhardt, Ph. Duhamel, R. Evrard, A. Cordonnier - Le séchage flash - Séminaire de la Société de l'industrie Minérale - Dijon, 9 Octobre 1999 .In the grinding and / or drying plants of mineral materials, it is known to use "in-line" suspension drying machines which apply to materials having an average particle size of less than 10 mm. These devices in which the heat exchange is mass, via drying, and is very fast, are often called "flash". Such systems which are in the form of a development of a vertical pipe of hot gases have been described in publications and in particular B.Reinhardt, Ph.D. Duhamel, R. Evrard, A. Shoemaker - Drying Flash - Seminar of the Society of Mineral Industry - Dijon, 9 October 1999 .

Afin d'assurer une mise en suspension de la majeure partie des matières à traiter, et de permettre la mise en contact avec les gaz chauds pour atteindre le séchage de ladite matière, on crée un flux de gaz chaud ascendant dont la vitesse est de l'ordre de 30 à 40 m/s, entraînant ainsi une perte de charge importante.In order to ensure a suspension of the majority of the materials to be treated, and to allow contact with the hot gases to reach the drying of said material, a rising hot gas flow is created whose velocity is 30 to 40 m / s, resulting in a significant loss of load.

Bien qu'en principe, dans de tels systèmes, les fractions les plus grossières de la matière ne soient pas entraînées, ces appareils ne sont pas considérés comme des sélecteurs granulométriques. En effet, lorsque ces appareils sont chargés d'une fraction grossière composée de particules de diamètres divers, généralement, la majeure partie de la fraction chute, sans séparation et mise en suspension des particules les plus fines qui la composent.Although in principle, in such systems, the coarser fractions of the material are not entrained, these devices are not considered granulometric selectors. Indeed, when these devices are loaded with a coarse fraction composed of particles of various diameters, generally, most of the fraction falls, without separation and suspension of the finest particles that compose it.

Inversement, il arrive également que des fractions grossières de plus petites dimensions soient entraînées du fait de la forte intensité du flux ascendant. Le pouvoir de sélection de ces machines, qui exprime la capacité à pouvoir séparer les matières en fonction de la taille de leurs grains est donc faible.Conversely, it also happens that coarse fractions of smaller dimensions are driven due to the high intensity of the upward flow. The power of selection of these machines, which expresses the capacity to be able to separate the materials according to the size of their grains is thus weak.

En outre, la présence d'une fraction grossière en quantité trop importante perturbe le fonctionnement de ces appareils ainsi que le fonctionnement de l'installation à l'intérieur de laquelle ils sont installés. Par exemple, dans le cas d'une installation de broyage pour la production de ciment, l'appareil perturbera le fonctionnement du séparateur aéraulique placé en aval de celui-ci. En effet, lorsque les appareils de séchage sont chargés d'une fraction grossière importante, l'appareil devient instable, le flux ascendant nécessaire à la suspension de matière pulsant par à-coups.In addition, the presence of a coarse fraction in too much This disrupts the operation of these devices and the operation of the installation inside which they are installed. For example, in the case of a grinding plant for the production of cement, the device will disrupt the operation of the air separator placed downstream thereof. Indeed, when the drying apparatus is loaded with a large coarse fraction, the apparatus becomes unstable, the upward flow necessary for the suspension of pulsating material by jerks.

D'autres appareils de sélection granulométrique de matière dans un flux de gaz ascendant ont été imaginés, tels que celui décrit dans le document GB-2.193.448 . Introduisant une composante rotationnelle à la vitesse d'écoulement du gaz, de tels appareils sont adaptés à la séparation des matières de granulométrie modérée ne dépassant pas 10 mm de diamètre.Other material granulometric selection devices in an ascending gas flow have been devised, such as that described in the document GB-2,193,448 . Introducing a rotational component at the gas flow rate, such devices are suitable for the separation of materials of moderate particle size not exceeding 10 mm in diameter.

L'appareil du document GB-2.193.448 qui correspond au préambule de la revendication 1 comprend une conduite sensiblement verticale, à flux ascendant, munie d'une arrivée de gaz à sa base, équipée d'une ouverture supérieure par laquelle s'échappent les matières fines et d'une ouverture inférieure par laquelle chutent les matières grossières.The document device GB-2,193,448 which corresponds to the preamble of claim 1 comprises a substantially vertical pipe, upflow, provided with a gas inlet at its base, equipped with an upper opening through which the fines escape and a lower opening by which drop the coarse materials.

L'alimentation des matières se fait au niveau d'un point d'introduction entre l'ouverture supérieure et l'ouverture inférieure.The feed of the materials is at a point of introduction between the upper opening and the lower opening.

La conduite de l'appareil est équipée d'entonnoirs répartis sur la hauteur de la conduite, et notamment en dessous du point d'introduction, destinés à dévier les matières des parois internes de la conduite. Cet appareil est également équipé de moyens pour créer un vortex, constitués par des hélices fixes, réparties sur la hauteur de la conduite.The pipe of the apparatus is equipped with funnels distributed over the height of the pipe, and in particular below the point of introduction, intended to divert the materials of the internal walls of the pipe. This apparatus is also equipped with means for creating a vortex, constituted by fixed propellers, distributed over the height of the pipe.

Des plaques verticales, disposées entre les entonnoirs et les hélices, ont pour objet de créer des turbulences permettant la désintégration des matériaux agglomérés.Vertical plates, arranged between the funnels and the propellers, are intended to create turbulence allowing the disintegration of agglomerated materials.

Le but de la présente invention est de proposer un appareil de sélection granulométrique et/ou de séchage de matières pulvérulentes, destiné au traitement en suspension de matières minérales en grains dont au moins 90 % en poids ont une taille inférieure à 60 mm, qui fonctionne en ligne et de façon stable pour une application à des matières dont le spectre granulométrique est large.The object of the present invention is to provide an apparatus for granulometric selection and / or drying of pulverulent materials, for the suspension treatment of granular mineral materials of which at least 90% by weight are less than 60 mm in size, which operates in line and stably for application to materials with a wide particle size spectrum.

Un autre but de l'invention est de proposer un appareil de sélection granulométrique et/ou de séchage permettant une bonne séparation des fractions, qui peuvent être remises en suspension.Another object of the invention is to provide a particle size selection apparatus and / or drying allowing a good separation of fractions, which can be resuspended.

Un autre but de l'invention est de proposer un appareil de sélection granulométrique et/ou de séchage de matières pulvérulentes, constitué principalement par une conduite de gaz verticale, de faible encombrement, notamment de hauteur sensiblement inférieure à la hauteur de la conduite de gaz des appareils de séchage de type « flash » connus de l'homme de l'art.Another object of the invention is to provide an apparatus for granulometric selection and / or drying of pulverulent materials, consisting mainly of a vertical gas pipe of small size, especially of height substantially less than the height of the gas pipe. flash type drying apparatus known to those skilled in the art.

Un autre but de l'invention est de proposer un appareil de sélection granulométrique et/ou de séchage de matières pulvérulentes, fonctionnant à l'aide d'un flux ascendant de gaz dont la vitesse est bien inférieure à la vitesse du flux ascendant de gaz des appareils de séchage de type « flash » connus de l'homme de l'art, réduisant ainsi la perte de charge.Another object of the invention is to provide an apparatus for granulometric selection and / or drying of pulverulent materials, operating with the aid of an ascending flow of gas whose speed is much lower than the speed of the upward flow of gas. flash drying apparatus known to those skilled in the art, thus reducing the pressure drop.

D'autres buts et avantages de l'invention apparaîtront au cours de la description qui va suivre, qui n'est donnée qu'à titre indicatif, et qui n'a pas pour but de la limiter.Other aims and advantages of the invention will become apparent from the description which follows, which is given for information only, and which is not intended to limit it.

L'appareil concerne un appareil de sélection granulométrique et/ou de séchage de matières pulvérulentes, destiné au traitement en suspension de matières minérales en grains dont au moins 90 % en poids ont une taille inférieure à 60 mm, l'appareil étant constitué principalement d'une conduite de gaz sensiblement verticale, à flux ascendant, munie d'une arrivée de gaz à sa base, équipée d'une ouverture inférieure et d'une ouverture supérieure entre lesquelles une ouverture d'alimentation est également prévue pour l'introduction des matières, dans lequel appareil une partie de la matière, notamment dite fine, peut s'échapper avec le gaz par l'ouverture supérieure grâce à la portance dudit flux ascendant, tandis qu'une autre partie de matière, plus grossière, n'est pas entraînée par ledit gaz et chute par l'ouverture inférieure, l'appareil possède, en outre, des moyens pour créer des turbulences, favorables à la séparation des différentes fractions granulométriques et à la mise en suspension des matières, prévus au niveau de la paroi interne de la conduite de gaz, et situés entre l'ouverture inférieure et l'ouverture d'alimentation de ladite conduite.The apparatus relates to an apparatus for granulometric selection and / or drying of pulverulent materials, for the suspension treatment of granular mineral matter of which at least 90% by weight is less than 60 mm in size, the apparatus consisting mainly of a substantially vertical upflow gas line provided with a gas inlet at its base, equipped with a lower opening and an upper opening between which a supply opening is also provided for the introduction of materials, in which apparatus a part of the material, in particular said fine, can escape with the gas through the upper opening through the lift of said upward flow, while another part of matter, more coarse, is not driven by said gas and falls through the lower opening, the apparatus has, in addition, means for creating turbulence, favorable to the separation of different size fractions and the suspension of the materials, provided at the inner wall of the gas pipe, and located between the lower opening and the supply opening of said pipe.

Selon l'invention, les moyens pour créer des turbulences sont constitués au moins en partie, par des obstacles pour le flux de gaz ascendant, sous forme de pales globalement horizontales, fixées contre la paroi interne de ladite conduite de gaz, de longueur orientée vers le centre de la conduite de gaz, et disposées au moins sur deux niveaux successifs de hauteur, réparties angulairement en quinconce entre lesdits au moins deux niveaux successifs de hauteur, avec le cas échéant des zones latérales de recouvrement.According to the invention, the means for creating turbulence are formed at least in part, by obstacles for the upward gas flow, in the form of generally horizontal blades, fixed against the inner wall of said gas pipe, of length oriented towards the center of the gas pipe, and arranged at least on two successive levels of height, distributed angularly staggered between said at least two successive levels of height, with the possible lateral overlapping areas.

L'invention concerne également une installation de broyage en continu, notamment pour cimenterie, de type à circuit fermé, comportant :

  • un broyeur, notamment à galets ou encore à boulets, présentant une entrée de produits à broyer et une sortie de produits broyés,
  • un sélecteur-sécheur, constitué par un appareil de sélection granulométrique et de séchage à flux ascendant conforme à l'invention, comprenant une sortie de refus, inférieure, connectée à l'entrée du broyeur, une sortie de matière envolée, supérieure, entre lesquelles est également prévue une ouverture d'alimentation de matière,
  • un sélecteur dynamique comprenant au moins une entrée de matière connectée au moins à ladite sortie de matière envolée du sélecteur-sécheur, une sortie pour la matière sélectionnée, et une sortie de refus connectée à l'entrée du broyeur,
  • un filtre permettant de filtrer les gaz chargés des matières
    sélectionnées, connecté à la sortie de matière du sélecteur dynamique,
  • la sortie du broyeur étant connectée à la au moins une entrée de matière du sélecteur dynamique, et/ou à l'ouverture d'alimentation du sélecteur-sécheur,
  • au moins une alimentation de matière alimentant l'entrée du broyeur et/ou l'ouverture d'alimentation du sélecteur-sécheur.
The invention also relates to a continuous grinding plant, in particular for a cement plant, of closed circuit type, comprising:
  • a mill, in particular with pebbles or balls, having an input of products to be milled and an output of crushed products,
  • a selector-dryer, consisting of a grain size selection and drying upflow apparatus according to the invention, comprising a lower rejection outlet, connected to the input of the mill, a top flight outlet, between which is also provided a supply opening material,
  • a dynamic selector comprising at least one material inlet connected at least to said flight selector outlet of the dryer selector, an outlet for the selected material, and a rejection outlet connected to the mill inlet,
  • a filter for filtering the gases charged with the substances
    selected, connected to the material output of the dynamic selector,
  • the mill outlet being connected to the at least one material inlet of the dynamic selector, and / or to the feed opening of the dryer selector,
  • at least one material feed supplying the inlet of the mill and / or the feed opening of the selector-dryer.

L'invention sera mieux comprise à la lecture de la description suivante, accompagnée des dessins en annexe qui en font partie intégrante et parmi lesquels :

  • la figure 1 illustre schématiquement en vue de coupe, un appareil de sélection granulométrique et/ou de séchage conforme à l'invention selon un mode de réalisation,
  • la figure 2 illustre schématiquement en vue de coupe un appareil de sélection granulométrique et/ou de séchage de matières pulvérulentes conforme à l'invention selon un second mode de réalisation,
  • la figure 3 illustre schématiquement en vue de coupe un appareil de sélection granulométrique et/ou de séchage de matières pulvérulentes, conforme à l'invention selon un troisième mode de réalisation,
  • les figures 4a à 4d sont respectivement des vues selon des coupes horizontales illustrant diverses possibilités d'alimentation en gaz d'un plenum, encore appelé « boîte à vent »,
  • la figure 5 est une vue selon une coupe verticale de la conduite de gaz, illustrant une pale d'un appareil, notamment tel qu'illustré à la figure 1,
  • la figure 6 est une vue schématique d'une installation de broyage en continu, notamment pour cimenterie, de type à circuit fermé, intégrant un appareil de sélection granulométrique et/ou de séchage conforme à l'invention
  • la figure 7 est un graphique selon une échelle logarithmique permettant d'illustrer les capacités de sélection granulométrique élevées de l'appareil de sélection granulométrique et/ou de séchage conforme à l'invention.
The invention will be better understood on reading the following description, accompanied by the appended drawings which form an integral part thereof and among which:
  • the figure 1 illustrates diagrammatically in sectional view, a granulometric selection and / or drying apparatus according to the invention according to one embodiment,
  • the figure 2 schematically illustrates in view of cutting a particle size selection apparatus and / or drying of powdery materials according to the invention according to a second embodiment,
  • the figure 3 schematically illustrates in view of cutting an apparatus for granulometric selection and / or drying of pulverulent materials, according to the invention according to a third embodiment,
  • the Figures 4a to 4d are respectively views in horizontal sections illustrating various possibilities of supplying gas to a plenum, also called "wind box",
  • the figure 5 is a view in a vertical section of the gas pipe, illustrating a blade of an apparatus, particularly as illustrated in FIG. figure 1 ,
  • the figure 6 is a schematic view of a continuous grinding plant, in particular for a cement plant, of closed circuit type, incorporating a granulometric selection and / or drying apparatus according to the invention
  • the figure 7 is a graph on a logarithmic scale to illustrate the high particle size selection capabilities of the granulometric selection apparatus and / or drying according to the invention.

L'appareil de sélection granulométrique et/ou de séchage de matières pulvérulentes, conforme à l'invention, se distingue des systèmes connus de séchage de type « flash », qui comportent comme élément principal de mise en suspension de matières, un venturi dans le col duquel la vitesse des gaz est portée entre 30 et 40 m/s. La construction du venturi oblige à une hauteur totale du dispositif qui est de 5 à 6 fois la valeur du diamètre de la conduite verticale.The apparatus for selecting granulometric and / or drying pulverulent materials, according to the invention, differs from the known "flash" type drying systems, which comprise as a main element for suspending materials, a venturi in the where the speed of the gases is raised between 30 and 40 m / s. The construction of the venturi forces a total height of the device which is 5 to 6 times the value of the diameter of the vertical pipe.

Ces systèmes « flash » permettent de traiter des matières dont la taille de grains est inférieure à 20 mm avec une concentration spécifique ne dépassant pas 2,5 kg/kg de gaz. Au-delà de ces valeurs, des problèmes d'instabilité de fonctionnement apparaissent.These "flash" systems make it possible to treat materials whose grain size is less than 20 mm with a specific concentration not exceeding 2.5 kg / kg of gas. Beyond these values, problems of instability of operation appear.

L'appareil de sélection granulométrique et/ou de séchage de matières pulvérulentes, conforme à l'invention, est destiné au traitement en suspension de matières minérales en grains dont au moins 90 % en poids ont une taille inférieure à 60 mm.The apparatus for granulometric selection and / or drying of pulverulent materials, according to the invention, is intended for the suspension treatment of granular mineral materials of which at least 90% by weight have a size of less than 60 mm.

Tel qu'illustré selon les exemples de réalisation des figures 1 à 3, l'appareil est constitué principalement par une conduite de gaz 1, sensiblement verticale, à flux ascendant Fa, munie d'une arrivée de gaz à sa base.As illustrated by the example embodiments of the Figures 1 to 3 , the apparatus consists mainly of a gas pipe 1, substantially vertical, upflow Fa, provided with a gas inlet at its base.

Cette conduite peut être de section sensiblement circulaire elliptique ou rectangulaire. De manière préférentielle, le facteur de forme, c'est-à-dire le rapport longueur / largeur des dimensions de la section n'excède pas trois.This pipe may be of substantially circular elliptical or rectangular section. Preferably, the form factor, that is to say the length / width ratio of the dimensions of the section does not exceed three.

Cette conduite est équipée d'une ouverture inférieure 2, et d'une ouverture supérieure 3, entre lesquelles une ouverture d'alimentation 4 est également prévue pour l'introduction des matières. L'ouverture inférieure 2 peut être alimentée en gaz notamment par un plenum 7 encore appelé boîte à vent.This pipe is equipped with a lower opening 2, and an upper opening 3, between which a feed opening 4 is also provided for the introduction of materials. The lower opening 2 can be fed with gas including a plenum 7 also called wind box.

Une partie de la matière minérale en grains, notamment dite « fines », peut s'échapper avec le gaz par l'ouverture supérieure 3 grâce à la portance du flux ascendant Fa, tandis qu'une autre partie des matières, plus grossières, n'est pas entraînée par le gaz et chute par l'ouverture inférieure 2.Part of the granular mineral matter, in particular so-called "fines", can escape with the gas through the upper opening 3 thanks to the lift of the upward flow Fa, while another part of the materials, more coarse, is not driven by the gas and falls through the lower opening 2.

Selon l'invention, l'appareil 30 possède, en outre, des moyens 5 pour créer des turbulences, favorables à la séparation des différentes fractions granulométriques, ainsi qu'à la mise en suspension des matières, prévus au niveau de la paroi interne de la conduite de gaz 1 et situés entre l'ouverture inférieure 2 et l'ouverture d'alimentation 4 de la conduite de gaz 1.According to the invention, the apparatus 30 has, in addition, means 5 for creating turbulence, favorable to the separation of the different particle size fractions, as well as to the suspension of the materials, provided at the level of the internal wall of the gas pipe 1 and located between the lower opening 2 and the feed opening 4 of the gas pipe 1.

Avantageusement, les turbulences permettent notamment la séparation des particules de diamètres divers, d'une fraction grossière de matière, permettant ainsi la mise en suspension et l'évacuation par l'ouverture supérieure 3 des particules dites « fines » de cette fraction, et la chute des particules de plus grandes tailles par l'ouverture 2.Advantageously, the turbulences allow in particular the separation of the particles of various diameters, a coarse fraction of material, thus allowing the suspension and the evacuation by the upper opening 3 of the so-called "fine" particles of this fraction, and the larger particles fall through the opening 2.

Selon un mode de réalisation, notamment illustré à la figure 1, notamment, les moyens 5 pour créer les turbulences peuvent être constitués, au moins en partie, par des obstacles pour le flux de gaz ascendant Fa, situés contre la paroi interne de la conduite de gaz 1. Notamment, tels qu'illustrés à la figure 1 et à la figure 5 en détail, les obstacles peuvent prendre la forme de pales 10 globalement horizontales, dont la longueur est orientée vers le centre de la conduite de gaz 1.According to one embodiment, in particular illustrated in figure 1 in particular, the means 5 for creating the turbulences may consist, at least in part, of obstacles for the upward gas flow Fa, located against the inner wall of the gas pipe 1. In particular, as illustrated in FIG. figure 1 and at the figure 5 in detail, the obstacles may take the form of generally horizontal blades, whose length is oriented towards the center of the gas pipe 1.

Les pales pourront être disposées au moins suivant deux niveaux successifs de hauteur, tels qu'illustrés notamment à la figure 1. Avantageusement, les pales pourront être disposées angulairement en quinconce entre deux niveaux successifs de hauteur, avec, le cas échéant, des zones latérales de recouvrement, forçant notamment le flux de gaz ascendant à zigzaguer entre les pales de différents niveaux.The blades can be arranged at least in two successive levels of height, as illustrated in particular in the figure 1 . Advantageously, the blades may be arranged angularly staggered between two successive levels of height, with, where appropriate, lateral overlapping zones, forcing in particular the flow of ascending gas to zigzag between the blades of different levels.

Si on définit la longueur de la pale selon la direction située vers le centre de la conduite de gaz 1 et la largeur dans le sens orthogonal du plan horizontal, la longueur de chaque pale pourra représenter entre 2 et 30 % de la largeur libre de la conduite 1 selon l'axe de la pale.If we define the length of the blade in the direction towards the center of the gas pipe 1 and the width in the orthogonal direction of the horizontal plane, the length of each blade can represent between 2 and 30% of the free width of the conduct 1 along the axis of the blade.

La somme des largeurs de chaque pale notamment disposées au moins à deux niveaux successifs de hauteur pourra représenter au moins 60 % de la longueur périphérique de la conduite. On entend par longueur périphérique de la conduite le périmètre de la section de la conduite de gaz 1, obtenue par l'intersection de la conduite avec un plan horizontal. La somme des largeurs des pales pourra être avantageusement comprise entre 120 % et 200 % de la longueur périphérique de la conduite.The sum of the widths of each blade in particular disposed at least at two successive levels of height may represent at least 60% of the peripheral length of the pipe. We mean by length Peripheral conduct the perimeter of the section of the gas pipe 1, obtained by the intersection of the pipe with a horizontal plane. The sum of the widths of the blades may advantageously be between 120% and 200% of the peripheral length of the pipe.

Avantageusement, tel qu'illustré à la figure 5, la forme et la position des pales 10 dans la conduite de gaz 1 pourra être favorable à une accumulation de matières, notamment stagnantes, sur le dessus desdites pales 10 en période de fonctionnement, afin de protéger lesdites pales contre l'érosion. Notamment, la pale pourra être de forme concave sur le dessus de pale ou encore présenter un ou plusieurs rebords supérieurs, notamment à l'extrémité de pales 13. L'extrémité 13 pourra être protégée par une matière plus dure, la conduite 1 pouvant être recouverte d'un matériau 12 de protection contre l'abrasion.Advantageously, as illustrated in figure 5 , the shape and position of the blades 10 in the gas pipe 1 may be favorable to an accumulation of materials, including stagnant, on top of said blades 10 during operation, to protect said blades against erosion. In particular, the blade may be of concave shape on the blade top or may have one or more upper flanges, in particular at the end of blades 13. The end 13 may be protected by a harder material, the pipe 1 may be covered with a material 12 of protection against abrasion.

Ainsi, au point d'introduction de la matière et du fait de la présence de fractions grossières dont la vitesse naturelle de chute est supérieure à la vitesse ascendante du gaz, une partie de la matière n'est pas remise en suspension. La chute de matière s'effectue principalement par glissement au long des parois. Les matières glissant le long des parois sont arrêtées, et la turbulence des gaz créée au voisinage des pales permet la séparation des diverses fractions granulométriques présentes et la remise en suspension des moins grossières.Thus, at the point of introduction of the material and because of the presence of coarse fractions whose natural rate of fall is greater than the ascending rate of the gas, part of the material is not resuspended. The fall of material is mainly by sliding along the walls. The materials sliding along the walls are stopped, and the turbulence of the gases created in the vicinity of the blades allows the separation of the various granulometric fractions present and the resuspension of the less coarse.

Alternativement ou additionnellement aux obstacles sur la paroi interne de la conduite, notamment auxdites pales 10, les moyens 5 pour créer des turbulences pourront être constitués, au moins en partie, par au moins un flux de gaz de paroi Fp, orienté globalement perpendiculaire à la direction du flux ascendant Fa pénétrant notamment radialement ou tangentiellement dans le volume interne de la conduite de gaz 1 par des orifices 8 de paroi de ladite conduite de gaz 1.Alternatively or additionally to the obstacles on the inner wall of the pipe, in particular to said blades 10, the means 5 for creating turbulence may be constituted, at least in part, by at least one wall gas flow Fp, oriented generally perpendicular to the direction of the ascending flow Fa penetrating notably radially or tangentially in the internal volume of the gas pipe 1 through the wall orifices 8 of said gas pipe 1.

La somme de surface des orifices 8 pourra représenter entre 15 % et 150 % de la section libre de la conduite 1.The surface sum of the orifices 8 may represent between 15% and 150% of the free section of the pipe 1.

L'appareil peut présenter au moins un plenum 7 entourant la partie basse de la conduite, permettant d'alimenter en gaz l'ouverture inférieure 2 d'entrée de gaz et/ou le cas échéant les orifices 8 des parois de la conduite. Notamment, selon un mode de réalisation non illustré, l'arrivée de gaz peut être constituée uniquement par l'ouverture inférieure 2. Selon les exemples de la figure 1 ou 2, l'arrivée de gaz de la conduite est constituée par l'ouverture inférieure 2 et les orifices de paroi 8. Selon l'exemple de la figure 3, l'arrivée de gaz est constituée uniquement par les orifices 8 de paroi. Le plenum 7 peut se présenter sous la forme d'une boîte présentant une sortie d'évacuation 9 pour les matières en chute, telle qu'illustrée notamment à la figure 1 ou 2.The apparatus may have at least one plenum 7 surrounding the lower part of the pipe, for supplying gas to the lower opening 2 of the gas inlet and / or where appropriate the orifices 8 of the walls of the pipe. In particular, according to a non-illustrated embodiment, the gas inlet may consist solely of the lower opening 2. According to the examples of the figure 1 or 2 , the gas inlet of the pipe is constituted by the lower opening 2 and the wall openings 8. According to the example of the figure 3 the gas supply is constituted solely by the wall orifices 8. The plenum 7 can be in the form of a box having an evacuation outlet 9 for falling materials, as illustrated in particular in FIG. figure 1 or 2 .

Le plenum 7 peut être alimenté en gaz par l'intermédiaire d'au moins une entrée de gaz radiale 6, 6-1 et/ou au moins une entrée de gaz tangentielle 6-2, 6-3. Notamment, telle qu'illustrée aux figures 4a et 4c, la chambre du plenum 7 est alimentée par une ou deux entrées radiales 6 ; 6, 6-1. Telle qu'illustrée aux figures 4b et 4d, la chambre du plenum 7 est alimentée par une ou deux entrées tangentielles 6-2 ; 6-2, 6-3.The plenum 7 can be supplied with gas via at least one radial gas inlet 6, 6-1 and / or at least one tangential gas inlet 6-2, 6-3. In particular, as illustrated in Figures 4a and 4c the plenum chamber 7 is fed by one or two radial inlets 6; 6, 6-1. As illustrated in Figures 4b and 4d the plenum chamber 7 is fed by one or two tangential inlets 6-2; 6-2, 6-3.

Nous décrivons par la suite différents exemples de réalisation.We describe various examples of realization later.

L'exemple de réalisation illustré à la figure 1 comprend principalement une conduite de gaz 1 présentant une ouverture supérieure 3, une ouverture inférieure 2 constituant également une entrée de gaz principale. Les moyens 5 pour créer des turbulences sont constitués, d'une part, par des obstacles constitués par des pales 10, réparties suivant plusieurs niveaux de hauteur successifs et disposés angulairement en quinconce suivant deux niveaux de hauteur successifs, et d'autre part, par des orifices 8 de paroi laissant passer les flux de gaz de paroi Fp.The exemplary embodiment illustrated in figure 1 comprises mainly a gas pipe 1 having an upper opening 3, a lower opening 2 also constituting a main gas inlet. The means 5 for creating turbulence are constituted, on the one hand, by obstacles constituted by blades 10, distributed in several successive height levels and angularly arranged in staggered rows in two successive levels of height, and on the other hand, by wall openings 8 passing through the wall gas flows Fp.

Un unique plenum entourera la partie basse de la conduite et permet d'alimenter en gaz, d'une part, les orifices 8, et d'autre part l'ouverture inférieure 2.A single plenum will surround the lower part of the pipe and can supply gas, on the one hand, the orifices 8, and on the other hand the lower opening 2.

Cet appareil peut être mis en oeuvre avec une conduite de gaz dont la longueur ne dépasse pas 4 à 5 fois la valeur du diamètre. La vitesse du flux ascendant de gaz peut être de 15 m/s. Dans cet exemple, les matières ont une taille maximale de grains égale à 100 mm, à une concentration spécifique comprise entre 5 et 6 kg/kg de gaz.This apparatus can be implemented with a gas pipe whose length does not exceed 4 to 5 times the value of the diameter. The speed of the upward flow of gas can be 15 m / s. In this example, the topics have a maximum grain size of 100 mm at a specific concentration of between 5 and 6 kg / kg of gas.

L'installation peut fonctionner sans instabilité et opère la sélection des matières telles que seules les particules de taille inférieure à 0,8 mm environ sont envolées et que les particules de taille supérieure à 2 mm environ chutent. La perte de charge résultante est de l'ordre de 60 % par rapport au système de séchage de type « flash » connu de l'état de l'art pour un même débit de matière.The installation can operate without instability and selects materials such that only particles smaller than about 0.8 mm are flown and particles larger than about 2 mm fall. The resulting pressure drop is of the order of 60% compared to the "flash" type drying system known from the state of the art for the same flow of material.

L'exemple de la figure 2 diffère de l'exemple de la figure 1 en ce que l'ouverture inférieure 2 est de diamètre inférieur à la plus grande section de la conduite de gaz 1, formée à l'extrémité d'un tronc de cône.The example of figure 2 differs from the example of the figure 1 in that the lower opening 2 is of smaller diameter than the largest section of the gas pipe 1, formed at the end of a truncated cone.

L'exemple de la figure 3 décrit un appareil dans lequel la totalité des gaz est introduite à travers les orifices 8 de paroi et non par l'ouverture inférieure 2. La somme des flux de paroi Fp permet alors la création du flux ascendant Fa. Les orifices de paroi 8 sont situés, en grande partie, au-dessous du niveau de pales 10 constituant des obstacles pour le flux ascendant Fa.The example of figure 3 describes an apparatus in which all the gases are introduced through the wall openings 8 and not through the lower opening 2. The sum of the wall flows Fp then allows the creation of the upflow Fa. The wall orifices 8 are located , in large part, below the level of blades 10 constituting obstacles for the upward flow Fa.

Selon le graphique illustrant le résultat de séparation sur un lot de matière à la figure 7, la matière première alimentée dans l'appareil objet de l'invention a une granulométrie telle que 50 % des grains sont inférieurs (ou supérieurs) à 3,2 mm avec 10 % supérieurs à une maille de 15 mm et une taille maximale de 35 mm. Le débit spécifique d'alimentation est de 5 à 6 kg/kg de gaz.According to the graph illustrating the separation result on a batch of material at the figure 7 the raw material fed into the apparatus forming the subject of the invention has a particle size such that 50% of the grains are smaller (or greater) than 3.2 mm with 10% greater than a mesh of 15 mm and a maximum size of 35 mm. mm. The specific feed rate is 5 to 6 kg / kg of gas.

La matière envolée vers la sortie 3 a une granulométrie telle que la quasi totalité des grains a une taille inférieure à 7 mm avec 50 % inférieurs (ou supérieurs) à 0,48 mm. La matière qui chute par l'ouverture inférieure 2 est telle que la quasi totalité des grains a une taille supérieure à 0,15 mm avec 50 % inférieurs (ou supérieurs) à 5 mm.The material flown to the exit 3 has a particle size such that almost all the grains have a size less than 7 mm with 50% lower (or higher) than 0.48 mm. The material falling through the lower opening 2 is such that almost all the grains have a size greater than 0.15 mm with 50% lower (or higher) than 5 mm.

La courbe de séparation qui exprime le taux de partage entre les deux flux pour chaque taille de grain possède une forte pente entre les tailles de grains de 0,7 mm où 20 % seulement des matières retombent et 3 mm où 90 % des matières retombent. Cette forte pente exprime un pouvoir de sélection élevée.The separation curve that expresses the split ratio between the two streams for each grain size has a steep slope between grain sizes of 0.7 mm where only 20% of the material falls back and 3 mm where 90% of the materials fall back. This steep slope expresses a high power of selection.

L'invention concernera également une installation de séchage comprenant un appareil conforme à l'invention, dont l'entrée de gaz est alimentée par une source de gaz en température.The invention will also relate to a drying installation comprising an apparatus according to the invention, the gas inlet of which is fed by a source of gas in temperature.

L'invention concernera également une installation 40 de broyage en continu, notamment pour cimenterie, de type à circuit fermé ou comprenant :

  • un broyeur 15, notamment à galets ou encore à boulets, présentant une entrée de produit à broyer et une sortie de produit broyé,
  • un sélecteur-sécheur 22, constitué par un appareil 30 de sélection granulométrique et de séchage à flux ascendant conforme à l'invention, comprenant une sortie 9 de refus, inférieure, connectée à l'entrée du broyeur 15, une sortie de matière envolée, supérieure, entre lesquelles est également prévue une ouverture d'alimentation de matière 4,
  • un sélecteur dynamique 16 comprenant au moins une entrée de matière connectée au moins à ladite sortie de matière envolée du sélecteur-sécheur 22, une sortie pour la matière sélectionnée, et une sortie de refus 23 connectée à l'entrée du broyeur 15,
  • un filtre 21 permettant de filtrer les gaz chargés de matière, connecté à la sortie de matière du sélecteur dynamique 16,
  • la sortie du broyeur 15 étant connectée 19-1 à ladite au moins une entrée de matière du sélecteur dynamique 16, et/ou 19-2 à l'ouverture d'alimentation 4 du sélecteur-sécheur 22,
  • au moins une alimentation de matière 17, 18, alimentant - l'entrée du broyeur 15 et/ou l'ouverture d'alimentation du sélecteur-sécheur 22.
The invention will also relate to a plant 40 for continuous grinding, in particular for a cement plant, of closed circuit type or comprising:
  • a grinder 15, in particular with rollers or with balls, having a product inlet to grind and a product outlet crushed,
  • a selector dryer 22, constituted by a grain size selection and drying device 30 according to the invention, comprising a lower outlet 9, connected to the input of the mill 15, an outgoing material flight, between which is also provided a feed opening of material 4,
  • a dynamic selector 16 comprising at least one material inlet connected to at least said flighted material outlet of the dryer selector 22, an outlet for the selected material, and a refusal outlet 23 connected to the inlet of the mill 15,
  • a filter 21 for filtering the material-laden gases connected to the material outlet of the dynamic selector 16,
  • the outlet of the mill 15 being connected 19-1 to the said at least one material inlet of the dynamic selector 16, and / or 19-2 to the feed opening 4 of the selector-dryer 22,
  • at least one feed of material 17, 18, supplying - the inlet of the mill 15 and / or the feed opening of the selector-dryer 22.

La figure 6 illustre de façon non exhaustive une installation de broyage intégrant un appareil 30 de sélection granulométrique et de séchage. Cette installation traite des matières 17, 18 dont l'une au moins est humide.The figure 6 Non-exhaustively illustrates a grinding plant incorporating a device 30 for selecting granulometric and drying. This facility processes materials 17, 18 at least one of which is wet.

L'installation qui traite les matières comprend un broyeur 15, un sélecteur dynamique 16, un filtre 21 qui recueille le produit fini broyé, et des moyens de manutention de matière telle qu'une chaîne à godets ou autres convoyeurs, ainsi que des moyens de ventilation pour les gaz. Cette installation reçoit des gaz chauds 20 provenant d'une source non décrite.The plant which processes the materials comprises a grinder 15, a dynamic selector 16, a filter 21 which collects the ground finished product, and material handling means such as a bucket chain or other conveyors, as well as ventilation means for the gases. This plant receives hot gases from an undescribed source.

L'alimentation de matière 17 alimente le broyeur 15, et le produit 19 sortant du broyeur est alimenté au sélecteur 16. La fraction fine étant le produit fini recueilli en 21 et la fraction grossière étant renvoyée vers le broyeur. Les gaz chauds 20 alimentent le broyeur 15, le sélecteur-sécheur 22 et le sélecteur dynamique 16.The material feed 17 feeds the mill 15, and the product 19 leaving the mill is fed to the selector 16. The fine fraction is the finished product collected at 21 and the coarse fraction is returned to the mill. The hot gases 20 feed the mill 15, the dryer selector 22 and the dynamic selector 16.

Dans l'installation décrite, l'appareil de sélection granulométrique et de séchage 30 est situé sur le chemin du gaz qui alimente le sélecteur dynamique 16 auquel il est connecté par sa conduite de gaz 1. L'appareil reçoit les gaz chauds par l'entrée 6 et est alimenté par une alimentation de matière 18 pour en réaliser le séchage plus efficacement que si cette matière était alimentée directement au broyeur 15.In the described installation, the particle size selection and drying apparatus 30 is located on the path of the gas supplying the dynamic selector 16 to which it is connected via its gas line 1. The apparatus receives the hot gases through the inlet 6 and is fed by a supply of material 18 to perform the drying more effectively than if this material was fed directly to the mill 15.

La fraction la plus fine continue vers le sélecteur dynamique 16 sur le chemin des gaz tandis que la fraction grossière retourne par la sortie 9 vers le broyeur 15 en même temps que le refus 23 du sélecteur. Alternativement, le refus peut être effectué par une conduite de refus 23' du sélecteur dynamique 16, disposé interne à la conduite de gaz 1 de l'appareil 30 du sélecteur-sécheur 22, ladite conduite de refus 23' débouchant en-dessous ou à proximité de la sortie 9 dudit sélecteur-sécheur 22.The thinnest fraction continues to the dynamic selector 16 in the gas path while the coarse fraction returns through the outlet 9 to the mill 15 at the same time as the rejection 23 of the selector. Alternatively, the refusal can be carried out by a refusal line 23 'of the dynamic selector 16 disposed internally to the gas line 1 of the apparatus 30 of the dryer selector 22, said refusal line 23' opening below or at near the exit 9 of said selector dryer 22.

Le sélecteur-sécheur 22 peut permettre de sélectionner la matière dont la taille des grains est inférieure à environ un millimètre, le sélecteur dynamique 16 permettant la sélection de matière dont la taille des grains est inférieure à la centaine, voire à la dizaine de micromètres.The selector dryer 22 can make it possible to select the material whose grain size is less than about one millimeter, the dynamic selector 16 allowing the selection of material whose grain size is less than one hundred or even ten micrometers.

La sélection granulométrique opérée par l'appareil 22 évite à la fois au sélecteur dynamique 16 d'être surchargé en fractions grossières provenant de l'étape de séchage en suspension d'un système de type « flash » traditionnel, et au broyeur 15 d'être surchargé en fractions fines si la matière neuve approvisionnée par l'alimentation 18 en contient en quantité significative. Si la capacité de séchage du broyeur 15 est faible, la matière 19 sortant du broyeur peut être divisée en deux flux 19-1 et 19-2, le second étant à nouveau soumis à l'étape de séchage rapide.The particle size selection operated by the apparatus 22 avoids both the dynamic selector 16 to be overloaded in coarse fractions from the suspension drying step of a conventional "flash" type system, and the grinder 15. be overloaded in fine fractions if the new material supplied by the feed 18 contains a significant amount. If the drying capacity of the mill 15 is low, the material 19 leaving the mill can be divided into two streams 19-1 and 19-2, the second being again subjected to the fast drying step.

Naturellement, d'autres modes de mise en oeuvre, à la portée de l'homme de l'art, auraient pu être envisagés sans pour autant sortir du cadre de l'invention définie par les revendications ci-après.Of course, other embodiments, within the reach of ordinary skill in the art, could have been envisaged without departing from the scope of the invention defined by the claims below.

Claims (11)

  1. Grain size selection and/or pulverulent-matter drying apparatus, intended for the treatment of suspended mineral particles, at least 90% in weight of which have a size less than 60 mm, apparatus (30) primarily constituted of a substantially vertical gas pipe (1), with an ascending flow (Fa), provided with a gas inlet at its base, a lower opening (2), and an upper opening (3) between which a supply opening (4) is also provided for the insertion of matter, in which apparatus a portion of the matter, in particular referred to as "fines", can escape with the gas through the upper opening (3) due to the bearing capacity of said ascending flow (Fa), while another coarser portion of the matter is not carried away by said gas and falls through the lower opening (2), the apparatus (30) also has a means (5) for creating turbulence, which favours the separation of the different grain sizes and the suspension of the matter that was not immediately carried away by the gas at their point of insertion, said means (5) being located between the lower opening (2) and the supply opening (4) of the pipe, characterised in that the means (5) for creating turbulence are constituted as least in part by obstacles for the ascending gas flow (Fa), in the form of globally horizontal blades (10), fastened against the internal wall of said gas pipe (1), with length directed towards the centre of the gas pipe (1), and arranged at least over two successive levels of height, distributed angularly in staggered fashion between said at least two successive levels of height, with where applicable overlapping lateral zones.
  2. Apparatus according to claim 1, wherein the shape and the position of the blades (10) in the gas pipe (1) favour an accumulation of matter on the top of said blades (10), in periods of operation, in order to protect said blades against erosion.
  3. Apparatus according to one of claims 1 or 2, wherein the length of the blades directed towards the centre of the represents between 2% and 30% of the free width of said pipe, with the sum of the widths of the blades representing at least 60% of the peripheral length of said pipe.
  4. Apparatus according to claim 3, wherein the sum of the widths of the blades (10) is between 120% and 200% of the peripheral length of the pipe (1).
  5. Apparatus according to one of claims 1 to 4, wherein said means for creating turbulence are constituted, furthermore, of at least one wall gas flow (Fp), directed globally perpendicularly in the direction of the ascending flow (Fa), penetrating into the internal volume of the gas pipe (1) through wall orifices (8) of said pipe (1).
  6. Apparatus according to one of claims 1 to 5, wherein the gas inlet is constituted of at least one plenum (7) surrounding the lower portion of the gas pipe (1), making it possible to supply gas to the lower opening (2) and/or, where applicable, the wall orifices (8) of the pipe.
  7. Apparatus according to claim 6, wherein the plenum (7) is supplied in gas by the intermediary of at least one radial gas inlet (6, 6-1) and/or at least one tangential gas inlet (6-2, 6-3).
  8. Apparatus according to claim 7, wherein the plenum (7) has the shape of a box having at least one outlet (9) for the falling particles.
  9. Drying facility comprising an apparatus according to one of claims 1 to 8 of which the gas inlet is supplied by a source of gas in temperature.
  10. Facility (40) for continuous milling, in particular for cement works, of the closed circuit type, including:
    - a mill (15), in particular with pebbles or balls, having a inlet for the product to mill and an outlet for the milled product,
    - a selector-dryer (22), constituted of a grain size drying apparatus (30) with ascending flow (Fa) according to one of claims 1 to 9, comprising a lower scrap outlet (9), connected to the inlet of the mill (15), an upper outlet for airborne matter, between which is also provided a supply opening for matter (4),
    - a dynamic selector (16) comprising at least one matter inlet connected at least to said outlet for airborne matter of the selector-dryer (22), an outlet for the selected matter, and a scrap outlet (23; 23') connected to the inlet of the mill (15),
    - a filter (21) making it possible to filter the gases loaded with selected matter, connected to the matter outlet of the dynamic selector (16),
    - the outlet of the mill (15) being connected (19-1) to said at least one matter inlet of the dynamic selector (16), and/or (19-2) to the supply opening (4) of the selector-dryer (22),
    - at least one supply of matter (17, 18) supplying the inlet of the mill (15) and/or the supply opening of the selector-dryer (22).
  11. Facility according to claim 10, wherein the scrap pipe (23') of the dynamic selector (16) is internal to the gas pipe (1) of the selector-dryer (22) opening under or in the vicinity of the scrap outlet (9) of said selector-dryer (22).
EP07870307A 2006-11-20 2007-11-20 Grain size selection and/or matter drying apparatus Active EP2106294B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07870307T PL2106294T3 (en) 2006-11-20 2007-11-20 Grain size selection and/or matter drying apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0610144A FR2908673B1 (en) 2006-11-20 2006-11-20 APPARATUS FOR SELECTING GRANULOMETRIC AND / OR DRYING MATERIAL.
PCT/FR2007/001901 WO2008068432A2 (en) 2006-11-20 2007-11-20 Grain size selection and/or matter drying apparatus

Publications (2)

Publication Number Publication Date
EP2106294A2 EP2106294A2 (en) 2009-10-07
EP2106294B1 true EP2106294B1 (en) 2012-03-14

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EP07870307A Active EP2106294B1 (en) 2006-11-20 2007-11-20 Grain size selection and/or matter drying apparatus

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US (1) US8245963B2 (en)
EP (1) EP2106294B1 (en)
JP (1) JP5497443B2 (en)
CN (1) CN101583429B (en)
AT (1) ATE549088T1 (en)
CA (1) CA2670906C (en)
DK (1) DK2106294T3 (en)
ES (1) ES2384402T3 (en)
FR (1) FR2908673B1 (en)
MX (1) MX2009005334A (en)
PL (1) PL2106294T3 (en)
RU (1) RU2445174C2 (en)
UA (1) UA95818C2 (en)
WO (1) WO2008068432A2 (en)

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FR2959679B1 (en) 2010-05-05 2015-02-20 Fives Fcb PROCESS FOR GRINDING MINERAL MATERIAL CONTAINING AT LEAST CALCIUM AND METAL IMPURITIES, AND INSTALLATION SUITABLE FOR GRINDING MINERAL MATERIAL CONTAINING CALCIUM AND METAL IMPURITIES AS SUCH.
JP5179540B2 (en) * 2010-05-20 2013-04-10 株式会社キンキ Crushing dryer and crushing and drying equipment equipped with it
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CN114226248B (en) * 2021-11-16 2022-11-18 太原理工大学 Treatment method for quality-based classification of coal ash of circulating fluidized bed

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Also Published As

Publication number Publication date
CA2670906C (en) 2012-01-10
FR2908673B1 (en) 2009-11-06
UA95818C2 (en) 2011-09-12
US20100133369A1 (en) 2010-06-03
FR2908673A1 (en) 2008-05-23
US8245963B2 (en) 2012-08-21
WO2008068432A2 (en) 2008-06-12
JP5497443B2 (en) 2014-05-21
DK2106294T3 (en) 2012-06-18
CN101583429A (en) 2009-11-18
EP2106294A2 (en) 2009-10-07
ATE549088T1 (en) 2012-03-15
RU2009123505A (en) 2010-12-27
WO2008068432A3 (en) 2008-08-07
ES2384402T3 (en) 2012-07-04
CA2670906A1 (en) 2008-06-12
PL2106294T3 (en) 2012-08-31
RU2445174C2 (en) 2012-03-20
MX2009005334A (en) 2009-09-02
JP2010510468A (en) 2010-04-02
CN101583429B (en) 2011-11-16

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