Method for controlling a smelting reduction process

C - Chemistry – Metallurgy – 21 – B

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C21B 13/00 (2006.01) C21B 13/14 (2006.01) C21C 5/30 (2006.01)

Patent

CA 2296351

Method for controlling a smelting reduction process, in partic- ular a cyclone converter furnace process for producing pig iron, char- acterised in that one: measures the carbon fraction C in the off-gas in the form of CO and CO2; measures the hydrogen fraction H2 in the off-gas in the form of H2 and H2O; determines the C/H2 ratio in the off-gas; compares the C/H2 ratio thus determined in the off-gas against the C/H2 ratio prevailing for the coal being supplied, and ad- justs the coal supply based on the difference found in the C/H2 ratios in the off-gas and the coal being supplied.

L'invention concerne la régulation d'un procédé de réduction avec fusion, en particulier d'un procédé à foyer-cyclone de conversion servant à produire de la fonte brute. Cette régulation est caractérisée par les opérations suivantes: on mesure dans l'effluent gazeux la fraction carbone C, présente sous la forme CO et CO2; on mesure dans l'effluent gazeux la fraction hydrogène H2, présente sous la forme H2 et H2O; on détermine le rapport C/H2 dans l'effluent gazeux; on compare ce rapport C/H2 ainsi déterminé dans l'effluent gazeux au rapport C/H2 déterminant pour l'apport de charbon; et on ajuste l'apport de charbon en fonction de la différence relevée entre les rapports C/H2 dans l'effluent gazeux et l'apport de charbon effectif.

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