Method of operating a multiple hearth furnace

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

Patent

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F27B 9/18 (2006.01)

Patent

CA 2443041

A method of operating multiple hearth furnace (10) with a plurality of vertically aligned hearth floors (361, 362, 363, 364, 365), comprises in particular following steps. A first material is fed onto the uppermost hearth floor and moved over this uppermost hearth floor (361) before it falls through a drop hole (40) onto the next lower hearth floor. This first material is processed in this way from hearth floor to hearth floor down to the lowermost hearth floor (366). A second material is fed onto one of the hearth floors to be mixed into the first material. This second material (64) is moved separately from the first material in a separate annular zone (68) of the hearth floor onto which it is fed before it is mixed into the first material. The method allows to provide an efficient thermal preconditioning of the second material prior to mixing it into the first material without requiring any supplementary equipment therefore.

L'invention concerne un procédé pour faire fonctionner un four à soles multiples (10) présentant une pluralité de soles de creuset (361, 362, 363, 364, 365) alignées verticalement. Ce procédé comprend en particulier les étapes suivantes : un premier matériau est acheminé à la sole de creuset la plus haute (361) et déplacé sur cette dernière avant de tomber sur la sole de creuset située immédiatement en dessous à travers un orifice de distribution (40). Le premier matériau est ainsi traité en descendant d'une sole de creuset à l'autre, jusqu'à la sole de creuset la plus basse (366). Un deuxième matériau (64) est déplacé séparément du premier matériau dans une zone annulaire séparée (68) de la sole de creuset à laquelle il est acheminé avant d'être mélangé au premier matériau. Ce procédé permet d'obtenir un préconditionnement thermique efficace du deuxième matériau avant son mélange au premier matériau, sans nécessiter un équipement supplémentaire à cet effet.

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