Method and arrangement for heat-treating a material

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 1/20 (2006.01) F27B 21/06 (2006.01)

Patent

CA 2184843

The installation proposed includes a conveyor belt (7) on which a bulk sinter mixture is deposited by a device (9). The conveyor belt carries the sinter mixture through a sintering plant (1) at the entry to which is disposed an ignition oven (3). The oven ignites the upper surface of the sinter bed. An extractor (11) located below the sinter bed sucks the burning zone down into the sinter bed. Located below the sinter bed at the output end of the sintering plant (1) is a second ignition oven (4) which ignites the lower surface of the sinter bed. A second extractor (6) sucks the second burning zone upwards. The pollutant content of the exhaust gases is significantly reduced since, in the input zone, the uninserted material acts as a filter while, in the output zone, combustion of the pollutants produced takes place in the upper-surface combustion zone. An additional adsorption agent ensures that the pollutants emerge mainly in the output zone of the sintering plant.

Le système comprend une bande transporteuse (7) sur laquelle un dispositif (9) dépose un mélange de frittage en vrac. La bande transporteuse achemine ce mélange à travers une installation d'agglomération par frittage (1) dans la zone d'entrée de laquelle est monté un four d'allumage (3) qui allume la face supérieure du lit de frittage. Un dispositif d'extraction (11) aménagé sous le lit de frittage aspire la zone d'incandescence vers le bas dans le lit de frittage. Dans la zone de sortie de l'installation d'agglomération par frittage (1), en dessous du lit de frittage, il est prévu un second four d'allumage (4) qui allume la face inférieure du lit de frittage. Un second dispositif d'extraction (6) aspire la seconde zone d'incandescence vers le haut. La teneur en substances nocives des gaz brûlés est considérablement réduite, du fait que dans la zone située côté entrée, les constituants non agglomérés par frittage font office de filtre, tandis que, dans la zone située côté sortie, la postcombustion des substances nocives s'effectue dans la zone d'incandescence supérieure. Un adsorbant additionnel permet en outre aux substances nocives de sortir essentiellement dans la zone de sortie de l'installation d'agglomération par frittage.

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