DEVELOPMENT OF COAL INJECTION IN THE BLAST-FURNACE AT USINOR-SACILOR

All blast furnaces within Usinor Sacilor are presently equipped with c oal injection systems. A significant drop of coke rate has resulted fr om the progress in the understanding of the basic phenomena related to coal injection and simultaneously from a good operational control of the technique at each step of the process. The key point for a further reduction of coke rate is the proper process control of the blast fur nace, especially with respect to the gas distribution in the hearth an d the shaft. Advanced control techniques are to be used to achieve sim ultaneously low heat losses, good protection of the walls together wit h high gas efficiency and smooth operation.