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EP1711281B1 - Separator for granular material - Google Patents

Separator for granular material Download PDF

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Publication number
EP1711281B1
EP1711281B1 EP04802149A EP04802149A EP1711281B1 EP 1711281 B1 EP1711281 B1 EP 1711281B1 EP 04802149 A EP04802149 A EP 04802149A EP 04802149 A EP04802149 A EP 04802149A EP 1711281 B1 EP1711281 B1 EP 1711281B1
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EP
European Patent Office
Prior art keywords
recovery chamber
classifier
cage
chamber
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04802149A
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German (de)
French (fr)
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EP1711281A1 (en
Inventor
Xavier Prignon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Magotteaux International SA
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Magotteaux International SA
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Publication date
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Priority to EP04802149A priority Critical patent/EP1711281B1/en
Priority to PL04802149T priority patent/PL1711281T3/en
Publication of EP1711281A1 publication Critical patent/EP1711281A1/en
Application granted granted Critical
Publication of EP1711281B1 publication Critical patent/EP1711281B1/en
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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
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes

Definitions

  • the present invention relates to the separation of granular materials and in particular to the classification of powders or the like using dynamic air separators.
  • the separation of granular and pulverulent materials into two size fractions can be done by means of dynamic air separators.
  • the materials concerned are powders with particle sizes up to 1000 ⁇ m, such as cement, limestone or lime, ore and coal among others.
  • the rates of treated material vary from a few tons to several hundred tons per hour.
  • Dynamic separators have undergone several major evolutions allowing to classify them into 3 large families.
  • the first generation known generally under the names “turbo”, “heyd” or “whirlwind” has been improved by the second generation "type wedag”.
  • the 3rd generation is the most effective from the viewpoint of the separation efficiency.
  • the operating principle of the separators (O'Sepa, Sturtevant SD, 7) is described in the documents USP 4,551,241 and. EP 0023320 .
  • the document EP 0023320 also presents a device for the classification of granular materials with a lateral outlet for air charged with fine particles. This installation requires the use of additional filters and / or cyclones for the separation of fine materials.
  • the document US5,232,096 discloses an air separator with a rotating cage according to the state of the art characterized by a particular arrangement of the dispersion of the material fed into said separator. After separating the material into coarse and fine particles by means of the rotating cage, the fines and separation air are sent out of the separator to a filter or one or more cyclones where the fines will be separated from the air .
  • the present invention aims to disclose a dynamic air separator to avoid the use of external filters or cyclones, the recovery of fines being in the body of the separator itself.
  • the present invention also relates to a granulometric separation process using the separator of the invention.
  • said recovery chamber 2 may comprise fixed and / or movable baffles (4,7) for modifying the speed of the air and / or changing the direction thereof.
  • said fine material recovery chamber 2 is cylindrical or frustoconical, the cone being openable upwards or downwards.
  • said fine material recovery chamber 2 has a length which corresponds to 2 to 6 times the length of the rotating cage 1 to have a necessary and sufficient cyclone capacity.
  • said fine material recovery chamber 2 and said rotating cage 1 have the same vertical axis as the recovery chamber 2 located below and in the extension of said cage 1.
  • the deflectors 4 which are positioned in the outgoing part of the rotary cage 1 and / or in the recovery chamber 2, are driven by the rotation means of the cage 1, or by a separate device
  • the deflectors 4 which are positioned in the outgoing portion of the rotary cage 1 are fixed on said cage 1 itself.
  • the invention further specifies that the air discharge duct 3 passes through the outlet bottom of the recovery chamber 2, said duct having a diameter between 30 and 95% of the bottom diameter of the recovery chamber 2 of the fine materials.
  • a plurality of openings and / or slots is disposed in the bottom of the recovery chamber 2.
  • a plurality of ducts 8 leading to a circular airlifter conveying the material to another means of transport.
  • the separator of the invention is also characterized by the presence above the bottom of the recovery chamber 2, outside the air evacuation pipe 3, one or more conical baffles 7, cylindrical or radial (inclined or straight), to minimize turbulence around the bottom of the chamber and avoid the recovery of the material by air.
  • the invention also shows the presence of a plurality of openings in the lower part of the casing 5 of the recovery chamber 2, these openings ending in harvesting ducts of the fine material can be placed so that adequate (not shown).
  • the invention discloses the use of the device described in claim 1 for the separation and classification of inorganic material particles such as particles of cement, clinker, lime and coal.
  • the figure 1 represents the diagram of a 3rd generation separator according to prior art.
  • the figure 2 represents the schematic diagram of the separator of the invention.
  • the heart of the separator consists of a squirrel cage 1 rotating around a vertical axis. This cage consists of plates or spaced bars and is surrounded by louvers 14 to guide the air before entering through the inlet volute 6 in the cage 1. Des.ventelles 14 can also participate in the management of the flow air.
  • the material to be separated ends in the selection zone delimited by the outside of the cage 1 and the deflectors 4.
  • the maximum size of the particles entering the cage with the air will be determined by the speed of rotation of the cage 1 and the amount of air with which the separator will be fed.
  • the larger particles remain outside the cage and are recovered in the discharge chamber 17. These large particles leave the separator by gravity 10.
  • the charged air of the fine particles 15 leaves the cage either from above or laterally and leaves the separator by a pipe.
  • the recovery of the fine material is then done by means of cyclone (s) or filter (s) outside (s) the body of the separator.
  • the air enters the cage 1 with a tangential speed of the same order of magnitude as the circumferential speed of the cage.
  • the tangential component of the velocity increases naturally with the penetration of the air inside the cage 1 (vortex effect).
  • the principle of the invention is schematized in the figure 2 . It consists in using the vortex already created to cyclone the material to be treated 13 in an adjacent recovery chamber 2 and coaxial with the cage 1, the dust-free air 12 leaving this recovery chamber 2 through an evacuation duct. air 3 whose inlet is located inside the recovery chamber 2. The dusted air 12 is then sucked to one or more fans that return the air partially or entirely to the inlet volute of air 6 of the separator.
  • the vortex created by the rotating cage 1 can either remain free or be accelerated by fixed or movable deflectors 4 before entering said chamber. recovery 2. These deflectors 4 may also be located in the recovery chamber 2 itself.
  • the fine material 11 is centrifuged in this recovery chamber 2 and will concentrate in the outer part of the chamber where it will be harvested by means of openings in the walls (cylindrical envelope and / or bottom) of the recovery chamber 2.
  • the recovery efficiency of the fine materials 11 depends essentially on the size of the particles and their absolute density. At equal matter the important factors are the vortex intensity, ie the tangential velocity of the air throughout the recovery chamber 2, the diameter of the recovery chamber 2 and the residence time particles in said chamber.
  • the important factors will be the diameter of the recovery chamber 2, the length thereof and the tangential velocity of the air.
  • the invention therefore consists of a cage separator, provided with a fine material recovery chamber 2 which is installed coaxially in the extension of the rotary cage 1.
  • This fines recovery chamber is cylindrical or conical (frustoconical), the angle of the generatrix of the cone with the axis of revolution of the cone being preferably less than 30 °, the inlet diameter of the recovery chamber 2 of the fine material is of the same order of magnitude as the diameter of the cage 1 as well as a length corresponding to 2 to 6 times the length of the cage 1.
  • deflectors 4 In the exit region of the cage 1 and / or in the recovery chamber 2 can be installed fixed or movable deflectors 4 for influencing the direction of the air nets.
  • the possible rotation of these deflectors 4 can be effected by fixing them on the cage 1 or can be set in motion by a drive independent of the cage 1. They can also be driven by the same means as the cage 1 without being fixed on said cage 1.
  • the discharge duct 3 of the air discharged with material 12 will be on its first part concentric with the recovery chamber and will preferably have a diameter of between 0.3 and 0.95 times the diameter of the bottom of the recovery chamber 2 in the plane. the entrance surface of said duct. Outlet baffles 7 may be arranged to control the air inlet direction at the entrance of the pipe.
  • the recovery of the centrifuged material is done by the application of openings on the outlet bottom and / or on the lower half of the casing 5 of the recovery chamber 2.
  • the ducts or material duct 8 are arranged opposite these openings to collect and guide the material to conventional means of transport.
  • the invention avoids the use of filters or cyclones external to the machine thus facilitating its implantation.
  • An additional advantage lies in the fact that the separation assembly is more compact, which reduces the engineering work for implantation, reduces installation costs and reduces the pressure drops in the separation circuit.

Landscapes

  • Cyclones (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Centrifugal Separators (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Glass Compositions (AREA)
  • Disintegrating Or Milling (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

The separator has a chamber (2) for recuperation of fine materials, delimited by a rotating envelope (5). The chamber is arranged coaxially in the extension of a rotating cage (1) to use the vortex created by the cage for cyclone separation of the material. The chamber has openings in the envelope permitting the passage of the centrifuged material towards material collecting conduits (8) placed outside the chamber. An independent claim is also included for a process of separating granular and powdery materials.

Description

Objet de l'inventionObject of the invention

La présente invention se rapporte à la séparation de matières granuleuses et en particulier à la classification des poudres ou assimilés à l'aide de séparateurs dynamiques à air.The present invention relates to the separation of granular materials and in particular to the classification of powders or the like using dynamic air separators.

Etat de la techniqueState of the art

La séparation de matières granuleuses et pulvurélentes en deux fractions granulométriques peut se faire au moyen de séparateurs dynamiques à air. Les matières concernées sont des poudres avec des tailles de particules allant jusqu'à 1000 µm, tel que du ciment, du calcaire ou de la chaux, du minerai et du charbon entre autres.The separation of granular and pulverulent materials into two size fractions can be done by means of dynamic air separators. The materials concerned are powders with particle sizes up to 1000 μm, such as cement, limestone or lime, ore and coal among others.

Les débits de matière traitée varient de quelques tonnes à plusieurs centaines de tonnes par heure.The rates of treated material vary from a few tons to several hundred tons per hour.

Les séparateurs dynamiques ont connu plusieurs évolutions majeures permettant de les classer en 3 grandes familles. La première génération connue généralement sous les noms « turbo », « heyd » ou « whirlwind » a été améliorée par la seconde génération « type wedag ».Dynamic separators have undergone several major evolutions allowing to classify them into 3 large families. The first generation known generally under the names "turbo", "heyd" or "whirlwind" has been improved by the second generation "type wedag".

La 3e génération est la plus performante du point de vue de l'efficacité de séparation. Le principe de fonctionnement des séparateurs (O'Sepa, Sturtevant SD, ...) est décrit dans les documents USP 4,551,241 et. EP 0023320 .The 3rd generation is the most effective from the viewpoint of the separation efficiency. The operating principle of the separators (O'Sepa, Sturtevant SD, ...) is described in the documents USP 4,551,241 and. EP 0023320 .

Le document US 4,551,241 divulgue un séparateur de particules muni d'un cyclone latéral dans lequel les particules sont renvoyées pour être cyclonées. Le surplus étant renvoyé vers la cage tournante du séparateur. L'ensemble de l'installation s'avère relativement encombrant et de conception assez complexe.The document US 4,551,241 discloses a particle separator provided with a side cyclone in which particles are returned to be cycloned. The surplus being returned to the rotating cage of the separator. The entire installation is relatively bulky and quite complex design.

Le document EP 0023320 présente également un dispositif pour la classification des matières granuleuses avec une sortie latérale pour l'air chargé en fines particules. Cette installation nécessite l'utilisation de filtres et/ou cyclones supplémentaires pour la séparation des matières fines.
Le document US 5,232,096 divulgue un séparateur à air avec une cage tournante selon l'état de l'art caractérisé par un arrangement particulier de la dispersion de la matière alimentée dans ledit séparateur. Après séparation de la matière en grosses et fines particules au moyen de la cage tournante, les fines et l'air de séparation sont envoyés à l'extérieur du séparateur vers un filtre ou un ou plusieurs cyclones où les fines seront séparées de l'air.The document EP 0023320 also presents a device for the classification of granular materials with a lateral outlet for air charged with fine particles. This installation requires the use of additional filters and / or cyclones for the separation of fine materials.
The document US5,232,096 discloses an air separator with a rotating cage according to the state of the art characterized by a particular arrangement of the dispersion of the material fed into said separator. After separating the material into coarse and fine particles by means of the rotating cage, the fines and separation air are sent out of the separator to a filter or one or more cyclones where the fines will be separated from the air .

Buts de l'inventionGoals of the invention

La présente invention vise à divulguer un séparateur dynamique à air permettant d'éviter l'utilisation de filtres ou cyclones extérieurs, la récupération des fines se faisant dans le corps du séparateur lui-même.The present invention aims to disclose a dynamic air separator to avoid the use of external filters or cyclones, the recovery of fines being in the body of the separator itself.

La présente invention se rapporte également à un procédé de séparation granulométrique utilisant le séparateur de l'invention.The present invention also relates to a granulometric separation process using the separator of the invention.

Résumé de l'inventionSummary of the invention

La présente invention divulgue un séparateur dynamique à air pour la séparation de matières granuleuses et pulvérulentes en fractions granulométriques, comprenant une cage tournante dans lequel :

  • ledit séparateur comprend en outre une chambre de récupération 2 de matières fines avec un fond de sortie, ladite chambre 2 étant délimitée par une enveloppe 5 de révolution ;
  • ladite chambre de récupération 2 est aménagée de façon coaxiale dans le prolongement de la cage tournante 1 afin de pouvoir utiliser le vortex créé par la cage tournante pour le cyclonage de ladite matière ;
  • ladite chambre de récupération 2 comprend des ouvertures dans l'enveloppe 5 permettant le passage de la matière centrifugée vers des conduits 8 de collecte de matière située à l'extérieur de la chambre ;
The present invention discloses a dynamic air separator for the separation of granular and powdery materials into granulometric fractions, comprising a rotating cage in which:
  • said separator further comprises a recovery chamber 2 of fine material with an outlet bottom, said chamber 2 being delimited by a casing 5 of revolution;
  • said recovery chamber 2 is arranged coaxially in the extension of the rotary shaft 1 in order to be able to use the vortex created by the rotary shaft for cycloning said material;
  • said recovery chamber 2 comprises openings in the envelope 5 allowing the passage of the centrifuged material to the material collection ducts 8 located outside the chamber;

Par ailleurs, selon l'invention, ladite chambre de récupération 2 peut comporter des déflecteurs fixes et/ou mobiles (4,7) pour modifier la vitesse de l'air et/ou changer la direction de celui-ci.Furthermore, according to the invention, said recovery chamber 2 may comprise fixed and / or movable baffles (4,7) for modifying the speed of the air and / or changing the direction thereof.

Selon une forme préférée de l'invention, ladite chambre de récupération 2 des matières fines est cylindrique ou tronconique, le cône pouvant être ouvert vers le haut ou vers le bas.According to a preferred form of the invention, said fine material recovery chamber 2 is cylindrical or frustoconical, the cone being openable upwards or downwards.

Avantageusement, ladite chambre de récupération 2 des matières fines a une longueur qui correspond à 2 à 6 fois la longueur de la cage tournante 1 pour avoir une capacité de cyclonage nécessaire et suffisante.Advantageously, said fine material recovery chamber 2 has a length which corresponds to 2 to 6 times the length of the rotating cage 1 to have a necessary and sufficient cyclone capacity.

De manière particulièrement préférée, ladite chambre de récupération 2 des matières fines et ladite cage tournante 1 possèdent le même axe vertical que la chambre de récupération 2 se trouvant en dessous et dans le prolongement de ladite cage 1.In a particularly preferred manner, said fine material recovery chamber 2 and said rotating cage 1 have the same vertical axis as the recovery chamber 2 located below and in the extension of said cage 1.

Selon une première forme d'exécution de l'invention, les déflecteurs 4 qui sont positionnés dans la partie sortante de la cage tournante 1 et/ou dans la chambre de récupération 2, sont entraînes par les moyens de rotation de la cage 1, ou par un dispositif distinctAccording to a first embodiment of the invention, the deflectors 4 which are positioned in the outgoing part of the rotary cage 1 and / or in the recovery chamber 2, are driven by the rotation means of the cage 1, or by a separate device

Selon une seconde forme d'exécution de l'invention, les déflecteurs 4 qui sont positionnés dans la partie sortante de la cage tournante 1 sont fixés sur ladite cage 1 elle-même.According to a second embodiment of the invention, the deflectors 4 which are positioned in the outgoing portion of the rotary cage 1 are fixed on said cage 1 itself.

L'invention précise encore que le conduit d'évacuation d'air 3 traverse le fond de sortie de la chambre de récupération 2, ledit conduit ayant un diamètre compris entre 30 et 95 % du diamètre du fond de la chambre de récupération 2 des matières fines.The invention further specifies that the air discharge duct 3 passes through the outlet bottom of the recovery chamber 2, said duct having a diameter between 30 and 95% of the bottom diameter of the recovery chamber 2 of the fine materials.

De préférence, une pluralité d'ouvertures et/ou de fentes est disposée dans le fond de la chambre de récupération 2.Preferably, a plurality of openings and / or slots is disposed in the bottom of the recovery chamber 2.

Par ailleurs, en dessous desdites fentes et/ou ouvertures se trouvent une pluralité de conduits 8 menant à un moyen de transport de la matière.Furthermore, below said slots and / or openings are a plurality of ducts 8 leading to a means of transporting the material.

De manière avantageuse, en dessous desdites fentes et/ou ouvertures se trouvent une pluralité de conduits 8 menant à une aéroglissière circulaire transportant la matière vers un autre moyen de transport.Advantageously, below said slots and / or openings are a plurality of ducts 8 leading to a circular airlifter conveying the material to another means of transport.

Le séparateur de l'invention, se caractérise également par la présence au-dessus du fond de la chambre de récupération 2, à l'extérieur de la conduite d'évacuations de l'air 3, d'un ou plusieurs déflecteurs 7 coniques, cylindriques ou radiaux (inclinés ou droit), afin de minimiser les turbulences aux abords du fond de la chambre et éviter la reprise de la matière par l'air.The separator of the invention is also characterized by the presence above the bottom of the recovery chamber 2, outside the air evacuation pipe 3, one or more conical baffles 7, cylindrical or radial (inclined or straight), to minimize turbulence around the bottom of the chamber and avoid the recovery of the material by air.

Par ailleurs, l'invention montre également la présence d'une pluralité d'ouvertures dans la partie inférieure de l'enveloppe 5 de la chambre de récupération 2, ces ouvertures aboutissant dans des conduits de récolte de la matière fine pouvant être placés de manière adéquate (non représenté).Furthermore, the invention also shows the presence of a plurality of openings in the lower part of the casing 5 of the recovery chamber 2, these openings ending in harvesting ducts of the fine material can be placed so that adequate (not shown).

La présente invention divulgue également un procédé de séparation granulométrique par séparateur dynamique à air comportant les étapes suivantes :

  • approvisionnement de matière à traiter 13 vers la cage tournante 1 ;
  • sélection entre les grosses particules et les fines particules au niveau de la cage tournante 1 en fonction de la vitesse de rotation et de l'alimentation en air ;
  • rejet des grosses particules vers la chambre des rejets 17.
  • récupération des matières fines dans la chambre de récupération 2 disposée de façon coaxiale à la cage tournante ;
  • utilisation du vortex créé par la cage tournante et éventuellement encore accéléré par des déflecteurs mobiles ou fixes 4 pour le cyclonage de la matière fine ;
  • séparation de l'air dépoussiéré et des particules fines et évacuation de celles-ci vers un moyen de transport.
The present invention also discloses a method of separating particle size by dynamic air separator comprising the following steps:
  • supply of material to be treated 13 to the rotating cage 1;
  • selecting between the large particles and the fine particles at the rotating cage 1 as a function of the speed of rotation and the air supply;
  • rejection of large particles to the reject chamber 17.
  • recovery of fine materials in the recovery chamber 2 arranged coaxially with the rotating cage;
  • use of the vortex created by the rotating cage and possibly further accelerated by movable or fixed deflectors 4 for the cyclone of the fine material;
  • separation of the dust-free air and fine particles and evacuation thereof to a means of transport.

Enfin, l'invention divulgue l'utilisation du dispositif décrit dans la revendication 1 pour la séparation et la classification de particules de matière minérale telles que des particules de ciment, de clinker, de chaux et de charbon.Finally, the invention discloses the use of the device described in claim 1 for the separation and classification of inorganic material particles such as particles of cement, clinker, lime and coal.

Brève description des figuresBrief description of the figures

La figure 1 représente le schéma d'un séparateur de 3e génération selon l'état de la technique.The figure 1 represents the diagram of a 3rd generation separator according to prior art.

La figure 2 représente le schéma de principe du séparateur de l'invention.The figure 2 represents the schematic diagram of the separator of the invention.

Description de l'inventionDescription of the invention

Tous les types de séparateurs fonctionnent selon un même principe qui est représenté dans la figure 1. Le coeur du séparateur se compose d'une cage d'écureuil 1 tournant autour d'un axe vertical. Cette cage est constituée de plats ou de barreaux espacés et est entourée de ventelles 14 permettant de guider l'air avant d'entrer par la volute d'entrée 6 dans la cage 1. Des.ventelles 14 peuvent aussi participer à la gestion du flux d'air.All types of separators operate according to the same principle which is represented in the figure 1 . The heart of the separator consists of a squirrel cage 1 rotating around a vertical axis. This cage consists of plates or spaced bars and is surrounded by louvers 14 to guide the air before entering through the inlet volute 6 in the cage 1. Des.ventelles 14 can also participate in the management of the flow air.

La matière à séparer aboutit dans la zone de sélection délimitée par l'extérieur de la cage 1 et les déflecteurs 4. La taille maximale des particules entrant dans la cage avec l'air sera déterminée par la vitesse de rotation de la cage 1 et la quantité d'air avec laquelle le séparateur sera alimenté.The material to be separated ends in the selection zone delimited by the outside of the cage 1 and the deflectors 4. The maximum size of the particles entering the cage with the air will be determined by the speed of rotation of the cage 1 and the amount of air with which the separator will be fed.

Les particules plus grosses restent à l'extérieur de la cage et sont récupérées dans la chambre des rejets 17. Ces grosses particules sortent du séparateur par gravité 10. L'air chargé des fines particules 15 sort de la cage soit par le dessus ou latéralement et quitte le séparateur par une conduite. La récupération de la matière fine se fait ensuite au moyen de cyclone(s) ou de filtre(s) extérieur(s) au corps du séparateur.The larger particles remain outside the cage and are recovered in the discharge chamber 17. These large particles leave the separator by gravity 10. The charged air of the fine particles 15 leaves the cage either from above or laterally and leaves the separator by a pipe. The recovery of the fine material is then done by means of cyclone (s) or filter (s) outside (s) the body of the separator.

Dans les séparateurs modernes de 3e génération, l'air entre dans la cage 1 avec une vitesse tangentielle du même ordre de grandeur que la vitesse périphérique de la cage. La composante tangentielle de la vitesse augmente naturellement avec la pénétration de l'air à l'intérieur de la cage 1 (effet vortex).In modern separators 3rd generation, the air enters the cage 1 with a tangential speed of the same order of magnitude as the circumferential speed of the cage. The tangential component of the velocity increases naturally with the penetration of the air inside the cage 1 (vortex effect).

Le principe de l'invention est schématisé dans la figure 2. Celui-ci consiste à utiliser le vortex déjà créé pour cycloner la matière à traiter 13 dans une chambre de récupération 2 adjacente et coaxiale à la cage 1, l'air dépoussiéré 12 quittant cette chambre de récupération 2 par un conduit d'évacuation d'air 3 dont l'entrée est située à l'intérieur de la chambre de récupération 2. L'air dépoussiéré 12 est alors aspiré vers un ou plusieurs ventilateurs qui renvoient l'air en partie ou en totalité vers la volute d'entrée d'air 6 du séparateur.The principle of the invention is schematized in the figure 2 . It consists in using the vortex already created to cyclone the material to be treated 13 in an adjacent recovery chamber 2 and coaxial with the cage 1, the dust-free air 12 leaving this recovery chamber 2 through an evacuation duct. air 3 whose inlet is located inside the recovery chamber 2. The dusted air 12 is then sucked to one or more fans that return the air partially or entirely to the inlet volute of air 6 of the separator.

Le vortex créé par la cage tournante 1 peut soit rester libre, soit être accéléré par des déflecteurs fixes ou mobiles 4 avant d'entrer dans ladite chambre de récupération 2. Ces déflecteurs 4 peuvent aussi être situés dans la chambre de récupération 2 elle-même.The vortex created by the rotating cage 1 can either remain free or be accelerated by fixed or movable deflectors 4 before entering said chamber. recovery 2. These deflectors 4 may also be located in the recovery chamber 2 itself.

La matière fine 11 est centrifugée dans cette chambre de récupération 2 et va se concentrer dans la partie extérieure de la chambre où elle sera récoltée au moyen d'ouvertures dans les parois (enveloppe cylindrique et/ou fond) de la chambre de récupération 2.The fine material 11 is centrifuged in this recovery chamber 2 and will concentrate in the outer part of the chamber where it will be harvested by means of openings in the walls (cylindrical envelope and / or bottom) of the recovery chamber 2.

L'efficacité de récupération des matières fines 11 dépend essentiellement de la taille des particules et de leur densité absolue. A matière égale les facteurs importants sont l'intensité du vortex, c'est-à-dire la vitesse tangentielle de l'air tout au long de la chambre de récupération 2, le diamètre de la chambre de récupération 2 et le temps de séjour des particules dans ladite chambre.The recovery efficiency of the fine materials 11 depends essentially on the size of the particles and their absolute density. At equal matter the important factors are the vortex intensity, ie the tangential velocity of the air throughout the recovery chamber 2, the diameter of the recovery chamber 2 and the residence time particles in said chamber.

En d'autres termes, les facteurs importants seront le diamètre de la chambre de récupération 2, la longueur de celle-ci et la vitesse tangentielle de l'air. Plus la composante tangentielle de l'air est importante et plus la chambre est longue, meilleur sera le rendement de récupération.In other words, the important factors will be the diameter of the recovery chamber 2, the length thereof and the tangential velocity of the air. The greater the tangential component of the air and the longer the chamber, the better the recovery efficiency.

L'invention consiste donc en un séparateur à cage, muni d'une chambre de récupération de matières fines 2 qui est installée coaxialement dans le prolongement de la cage tournante 1. Cette chambre de récupération des fines est cylindrique ou conique (tronconique), l'angle de la génératrice du cône avec l'axe de révolution du cône étant de préférence inférieur à 30°, le diamètre d'entrée de la chambre de récupération 2 des matières fines est du même ordre de grandeur que le diamètre de la cage 1 ainsi qu'une longueur correspondant à 2 à 6 fois la longueur de la cage 1.The invention therefore consists of a cage separator, provided with a fine material recovery chamber 2 which is installed coaxially in the extension of the rotary cage 1. This fines recovery chamber is cylindrical or conical (frustoconical), the angle of the generatrix of the cone with the axis of revolution of the cone being preferably less than 30 °, the inlet diameter of the recovery chamber 2 of the fine material is of the same order of magnitude as the diameter of the cage 1 as well as a length corresponding to 2 to 6 times the length of the cage 1.

Dans la région de sortie de la cage 1 et/ou dans la chambre de récupération 2 peuvent être installés des déflecteurs fixes ou mobiles 4 permettant d'influencer la direction des filets d'air. La rotation éventuelle des ces déflecteurs 4 peut s'effectuer par la fixation de ceux-ci sur la cage 1 ou alors être mis en mouvement par un entraînement indépendant de la cage 1. Ils peuvent aussi être entraînés par les mêmes moyens que la cage 1 sans être fixés sur ladite cage 1.In the exit region of the cage 1 and / or in the recovery chamber 2 can be installed fixed or movable deflectors 4 for influencing the direction of the air nets. The possible rotation of these deflectors 4 can be effected by fixing them on the cage 1 or can be set in motion by a drive independent of the cage 1. They can also be driven by the same means as the cage 1 without being fixed on said cage 1.

Le conduit d'évacuation 3 de l'air déchargé de matière 12 sera sur sa première partie concentrique à la chambre de récupération et aura de préférence un diamètre compris entre 0.3 et 0.95 fois le diamètre du fond de la chambre de récupération 2 dans le plan de la surface d'entrée dudit conduit. Des déflecteurs de sortie 7 pourront y être aménages afin de maîtriser la direction d'entrée d'air à l'entrée de la conduite.The discharge duct 3 of the air discharged with material 12 will be on its first part concentric with the recovery chamber and will preferably have a diameter of between 0.3 and 0.95 times the diameter of the bottom of the recovery chamber 2 in the plane. the entrance surface of said duct. Outlet baffles 7 may be arranged to control the air inlet direction at the entrance of the pipe.

La récupération de la matière centrifugée se fait par l'application d'ouvertures sur le fond de sortie et /ou sur la moitié inférieure de l'enveloppe 5 de la chambre de récupération 2. Des gaines ou conduit de matière 8 sont aménagées en face de ces ouvertures afin de collecter et guider la matière vers des moyens de transport classiques.The recovery of the centrifuged material is done by the application of openings on the outlet bottom and / or on the lower half of the casing 5 of the recovery chamber 2. The ducts or material duct 8 are arranged opposite these openings to collect and guide the material to conventional means of transport.

L'utilisation d'une chambre de récupération coaxiale dans le prolongement de la cage tournante permet d'utiliser le vortex déjà crée par la cage et réduit par ce fait les pertes de charge du circuit aéraulique.The use of a coaxial recovery chamber in the extension of the rotating cage makes it possible to use the vortex already created by the cage and thereby reduces the pressure drops of the air flow circuit.

L'invention permet d'éviter l'utilisation de filtres ou cyclones extérieurs à la machine facilitant par conséquent son implantation. Un avantage supplémentaire réside dans le fait que l'ensemble de séparation est plus compact, ce qui diminue le travail d'engineering pour l'implantation, réduit les frais d'installation et diminue les pertes de charge dans le circuit de séparation.The invention avoids the use of filters or cyclones external to the machine thus facilitating its implantation. An additional advantage lies in the fact that the separation assembly is more compact, which reduces the engineering work for implantation, reduces installation costs and reduces the pressure drops in the separation circuit.

LégendeLegend

  • 1. Séparateur à cage tournante1. Rotary cage separator
  • 2. Chambre de récupération des matières fines2. Recovery chamber of fine materials
  • 3. Conduit d'évacuation d'air3. Exhaust air duct
  • 4. Déflecteurs fixes ou mobiles4. Fixed or moving deflectors
  • 5. Enveloppe de la chambre de récupération5. Recovery Chamber Envelope
  • 6. Volute d'entrée d'air6. Air inlet volute
  • 7. Déflecteurs de sortie7. Output deflectors
  • 8. Conduit de matière8. Material duct
  • 9. Air d'alimentation9. Supply air
  • 10. Matière grossière séparée par gravité10. Coarse material separated by gravity
  • 11. Matière fine11. Fine material
  • 12. Air dépoussiéré12. Dust-free air
  • 13. Matière à traiter13. Material to be treated
  • 14. Ventelles14. Ventelles
  • 15. Air et matière fine15. Air and fine material
  • 16. Conduit de sortie d'air16. Air outlet duct
  • 17. Chambre des rejets (grosses)17. House of rejections (large)
  • 18. Chambre des fines18. Chamber of fines

Claims (15)

  1. Dynamic air classifier for the separation of granular and powdery materials into fractions of different grain sizes comprising a rotary cage (1), wherein:
    - said classifier also comprises a recovery chamber (2) for fine materials with an outlet bottom, said chamber (2) being defined by a casing (5);
    - said recovery chamber (2) is coaxially arranged in the protrusion of the rotary cage (1) so as to be able to use the vortex created by the rotary cage for cycloning said material;
    - said recovery chamber (2) comprises openings in the casing (5) allowing the passage of the centrifuged material towards ducts (8) for collecting the material located outside the chamber.
  2. Classifier as in Claim 1, characterized in that said recovery chamber (2) comprises fixed and/or mobile deflectors (4,7).
  3. Classifier as in Claim 1, characterized in that said recovery chamber (2) for fine materials is cylindrical or cone-shaped, the cone being possibly open either at the top or at the bottom.
  4. Classifier as in Claim 1, characterized in that said recovery chamber (2) for fine material has a length that corresponds to 2 to 6 times the length of the rotary cage (1).
  5. Classifier as in Claim 1, characterized in that said recovery chamber (2) for fine materials and said rotary cage (1) share the same vertical axis, the recovery chamber (2) being positioned below and protruding from said cage (1).
  6. Classifier as in Claim 1, characterized in that the deflectors (4) that are positioned in the outlet part of the rotary cage (1) and/or in the recovery chamber (2) are driven by the rotation means of the cage (1) or by a separate device.
  7. Classifier as in Claim 1, characterized in that the deflectors (4) that are positioned in the outlet part of the rotary cage (1) are attached to said cage (1) itself.
  8. Classifier as in Claim 1, characterized in that the air-extraction duct (3) passes through the outlet bottom of the recovery chamber (2), said duct having a diameter between 30 and 95% of the bottom diameter of the recovery chamber (2) for fine materials.
  9. Classifier as in Claim 1, characterized in that a plurality of openings and/or slits are provided at the bottom of the recovery chamber (2).
  10. Classifier as in Claim 9, characterized in that there are a plurality of ducts (8) below said slits and/or openings, leading to a means for conveying the material.
  11. Classifier as in Claim 9, characterized in that there are a plurality of ducts (8) below said slits and/or openings, leading to a circular airslide conveying the material to another means of conveyance.
  12. Classifier as in Claim 1, characterized in that there are, above the bottom of the recovery chamber (2), outside of the air-extraction duct (3), one or several conical, cylindrical or radial (angled or straight) deflectors (7) so as to minimise the turbulence near the bottom of the chamber and to avoid that the material is picked up again by the air.
  13. Classifier as in Claims 1 and 2,
    characterized in that there are a plurality of openings in the lower part of the casing (5) of the recovery chamber (2), these openings leading to the ducts for collecting the fine material.
  14. Method of separation according to grain sizes by means of a dynamic air classifier, comprising the following steps:
    - feeding the material to be treated (13) to the rotary cage (1) ;
    - sorting between large and fine particles in the rotary cage (1) depending on the rotation velocity and air intake;
    - rejecting the large particles towards the refuse chamber (17);
    - recovering the fine materials in the recovery chamber (2) positioned coaxially with the rotary cage;
    - using the vortex created by the rotary cage and possibly further accelerated by mobile or fixed deflectors (4) for cycloning the fine material;
    - separating the dedusted air and the fine particles and extraction of the latter to a means of conveyance.
  15. Use of the device described in Claim 1 for the separation and classification of particles of mineral materials such as cement, clinker, lime and coal particles.
EP04802149A 2004-02-04 2004-12-08 Separator for granular material Expired - Lifetime EP1711281B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04802149A EP1711281B1 (en) 2004-02-04 2004-12-08 Separator for granular material
PL04802149T PL1711281T3 (en) 2004-02-04 2004-12-08 Separator for granular material

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04447026A EP1561519A1 (en) 2004-02-04 2004-02-04 Particle classifier
EP04802149A EP1711281B1 (en) 2004-02-04 2004-12-08 Separator for granular material
PCT/BE2004/000173 WO2005075115A1 (en) 2004-02-04 2004-12-08 Separator for granular material

Publications (2)

Publication Number Publication Date
EP1711281A1 EP1711281A1 (en) 2006-10-18
EP1711281B1 true EP1711281B1 (en) 2009-11-18

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EP04447026A Withdrawn EP1561519A1 (en) 2004-02-04 2004-02-04 Particle classifier
EP04802149A Expired - Lifetime EP1711281B1 (en) 2004-02-04 2004-12-08 Separator for granular material

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EP04447026A Withdrawn EP1561519A1 (en) 2004-02-04 2004-02-04 Particle classifier

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US (1) US7780012B2 (en)
EP (2) EP1561519A1 (en)
JP (1) JP2007520339A (en)
CN (1) CN1913981B (en)
AT (1) ATE448890T1 (en)
AU (1) AU2004315091B2 (en)
BR (1) BRPI0418068B1 (en)
CA (1) CA2554725C (en)
DE (1) DE602004024240D1 (en)
DK (1) DK1711281T3 (en)
ES (1) ES2335502T3 (en)
PL (1) PL1711281T3 (en)
PT (1) PT1711281E (en)
RU (1) RU2364448C2 (en)
WO (1) WO2005075115A1 (en)
ZA (1) ZA200606335B (en)

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DE602004024240D1 (en) 2009-12-31
AU2004315091B2 (en) 2010-08-12
JP2007520339A (en) 2007-07-26
BRPI0418068B1 (en) 2016-08-23
DK1711281T3 (en) 2010-03-08
CN1913981B (en) 2010-09-29
RU2364448C2 (en) 2009-08-20
CA2554725A1 (en) 2005-08-18
PT1711281E (en) 2010-02-05
US20070163925A1 (en) 2007-07-19
RU2006129323A (en) 2008-03-10
EP1711281A1 (en) 2006-10-18
CN1913981A (en) 2007-02-14
WO2005075115A1 (en) 2005-08-18
US7780012B2 (en) 2010-08-24
BRPI0418068A (en) 2007-04-17
ES2335502T3 (en) 2010-03-29
ZA200606335B (en) 2007-12-27
CA2554725C (en) 2012-04-03
EP1561519A1 (en) 2005-08-10
ATE448890T1 (en) 2009-12-15
AU2004315091A1 (en) 2005-08-18
PL1711281T3 (en) 2010-04-30

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