Calcining plant and method

F - Mech Eng,Light,Heat,Weapons – 27 – B

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F27B 15/00 (2006.01) F27B 15/02 (2006.01) C01G 7/00 (2006.01)

Patent

CA 2580085

Particulate material to be calcined is conditioned and then introduced into a stream of flue gases which transport the material along a sloping drying duct (26) while drying the material. The dried material is then introduced into the same stream of flue gases upstream of the drying duct (26), and the flue gases transport the dried material along a sloping preheating duct (38) while preheating the material. The preheated material is fed tangentially into the lower end of a vertical calcine reactor (56) and calcined product is withdrawn tangentially from the upper end of the reactor (56). The flue gases used for drying and preheating are produced in the calcine reactor (56) and are cooled during the drying and preheating.

Selon l'invention, des matières particulaires destinées à être calcinées sont conditionnées, puis introduites dans un flux de gaz de carneau qui transporte le matériau le long d'un conduit de séchage incliné (26) pendant le séchage du matériau. Le matériau séché est ensuite introduit dans le même flux de gaz de carneau en amont du conduit de séchage (26) et les gaz de carneau transportent le matériau séché le long d'un conduit de préchauffage incliné (38) pendant le préchauffage du matériau. Le matériau préchauffé est introduit de manière tangentielle dans l'extrémité inférieure d'un réacteur de calcination vertical (56) et le produit calciné est retiré tangentiellement de l'extrémité supérieure du réacteur (56). Les gaz de carneau utilisés pour le séchage et le préchauffage sont produits dans le réacteur de calcination (56) et refroidis pendant le séchage et le préchauffage.

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