A process for the direct reduction of particulate...

C - Chemistry – Metallurgy – 21 – B

Patent

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C21B 13/00 (2006.01)

Patent

CA 2207395

With a process for the direct reduction of particulate iron-containing material by fluidization, reformed gas, at least partially freed from CO2, is supplied to a fluidized- bed reduction zone as a reducing gas and is carried off from the same as a top gas and at least a portion of the top gas together with reformed gas is utilized for direct reduction. To economize on parts of the plant that are impinged on by reducing gas and in order to achieve savings in terms of heating costs, CH4 and N2 are, in addition to CO2, at least partially removed by adsorption, from 50 to 100 % of the reformed gas and 0 to 100 % of the top gas, and the tail gas removed from the reformed gas and/or the top gas by adsorption is utilized as a heating gas (Fig.1).

L'invention concerne un procédé de réduction directe de matériau particulaire renfermant du fer, selon la technique du lit fluidisé. Selon ce procédé, le CO2 est au moins partiellement extrait du gaz réformé qui est acheminé sous forme de gaz réducteur vers une zone de réduction d'un lit fluidisé puis retiré de cette dernière sous forme de gaz de gueulard, ce dernier étant ensuite mélangé au moins en partie avec le gaz réformé afin d'être utilisé pour la réduction directe. L'invention vise à réduire le nombre des composants de l'installation qui sont en contact avec le gaz réducteur, et à réduire les frais de chauffage. A cet effet, outre le CO2, au moins une partie du CH4 et du N2 est extraite de 50 à 100 % du gaz réformé et de 0 à 100 % du gaz de gueulard, par un procédé d'adsorption, et le gaz de queue extrait du gaz réformé ou du gaz de gueulard par adsorption est utilisé en tant que gaz de chauffage.

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