C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 5/14 (2006.01)
Patent
CA 2200985
In a process for reducing particulate oxicle-containing material in the whirl bed method, the oxide-containing material, by means of reducing gas flowing from bottom to top, is maintained in a whirl layer, thus being reduced. In order to avoid, or considerably reduce, operational interruptions of the reduction process caused by sticking or fouling, the clear tube speed of the reducing gas, exclusively above the whirl layer (24), is lowered over the total free cross section (31,32,33) of a space present above the whirl layer (24) continuously and under avoidance of whirl formations (Fig. 2).
Procédé de réduction de matériaux contenant des oxydes en forme de particules, selon le processus par fluidisation, dans lequel le matériau est maintenu à travers un courant gazeux réducteur circulant de bas en haut, dans un lit fluidisé, et se trouve ainsi réduit. Afin d'éviter ou de réduire le plus possible les interruptions de fonctionnement du processus de réduction, dues au colmatage ou à l'encrassement, la vitesse, en tube vide, d'écoulement du gaz de réduction est continuellement réduite exclusivement au-dessus du lit fluidisé (24), sur toute la section libre (31, 32, 33) d'un espace situé au-dessus du lit fluidisé (24), évitant ainsi la formation de tourbillons.
Werner Kepplinger Leopold
Whipp Roy Hubert Jr.
Zeller Siegfried
Zimmerbauer Karl-Heinz
Brifer International Ltd.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Voest-Alpine Industrieanlagenbau Gmbh
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