Device for the selective granulometric separation of solid...

B - Operations – Transporting – 07 – B

Patent

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B07B 11/06 (2006.01) B07B 4/04 (2006.01) B07B 7/083 (2006.01)

Patent

CA 2750690

The invention relates to a device for the selective granulometric separation of solid powdery materials using centrifugal action, capable of separating materials into two fractions, i.e. a fine material fraction and a coarse material fraction, including: a housing (6), a cylindrical rotor (2) which is rotatable, relative to said housing, about a vertical axis inside said housing and provided with blades (3) evenly distributed on the periphery of an upper outlet opening though which a stream of gas, laden with particles having a size lower than a predetermined particle size, is drawn, a set of vertical adjustable vanes evenly distributed about the rotor along the generatrices of a virtual cylinder and directing the gas stream towards the rotor, means for feeding the particles between the vanes and the rotor, collecting means lower than the rotor for collecting the unfed particles having fallen and having a size larger than the predetermined particle size. According to the invention, said collecting means includes a peripheral system with a fluidised bed, wherein the bed extends about the rotor axis, at least underneath said vanes and the gap between the vanes (7) and the rotor (2), the speed of the fluidisation gas in a horizontal section of the fluidised bed being lower than 1 m/s so as to induce another separation of the fine materials and of the coarse materials in which said fine materials are fed back into the gap between said areas and said rotor.

L'invention est relative à un dispositif de séparation granulométrique sélective de matières pulvérulentes solides, à action centrifuge, apte à séparer les matières en deux fractions, une fraction de matières fines et une fraction de matières grossières, comprenant : une enveloppe (6), un rotor cylindrique (2), rotatif par rapport à ladite enveloppe selon un axe vertical, interne à ladite enveloppe, muni de pales (3), régulièrement réparties sur la périphérie d'un orifice supérieur de sortie par où est aspiré le courant de gaz chargé de particules dont les dimensions sont inférieures à une granulométrie déterminée, un ensemble d'aubes verticales, orientables régulièrement réparties autour du rotor suivant les génératrices d'un cylindre fictif et qui canalisent le flux gazeux vers le rotor, des moyens pour introduire les particules entre les aubes et le rotor, des moyens de collecte, inférieurs au rotor pour les particules non entraînées, ayant chuté, de dimensions supérieures à ladite granulométrie déterminée. Selon l'invention, lesdits moyens de collecte comprennent un système périphérique à lit fluidisé, dont le lit s'étend autour de l'axe du rotor, au moins en dessous desdites aubes et de l'inter espace compris entre les aubes (7) et le rotor (2), la vitesse du gaz de fluidisation dans une section horizontale du lit fluidisé étant inférieure à 1 m/s, de telle façon à produire une nouvelle séparation entre les matières fines et les matières grossières pour laquelle lesdites matières fines sont renvoyées dans l'inter espace entre lesdites zones et ledit rotor.

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