Optimisation of the operation of a blast furnace by influencing the shape and position of the cohesive zone
This research aims at defining the operating conditions which allow the modification of the shape and position of the cohesive zone of the blast furnace with a view to optimising its performance. The position of the softening and melting zone has been determined by direct measurements inside two blast furnaces operating under various conditions. From the furnace axis to one quarter of the radius, the height of the cohesive zone is strongly influenced by the local volume fraction of coke. From the mid-radius to the wall, the coke proportion is more consistent and it has no effect on the height of the cohesive zone. As for the mean level of the cohesive zone, the lower the fuel rate, the lower it is. These observations led to the development of an algorithm giving an estimate of the cohesive zone profile based on the total fuel rate and the volume fraction of coke at the furnace centre. It was shown that the height of the cohesive zone above the tuyeres level is mainly determined by the gas quantity per ton of hot metal, whatever the radial position. These results also confirmed that the gas utilisation of the whole furnace strongly depends on the gas utilisation at the wall.
Bibliographic Reference: EUR 13425 FR (1991) 61 pp., FS, ECU 7.50
ISBN: ISBN 92-826-2656-3
Record Number: 199111137 / Last updated on: 1994-12-02
Original language: fr
Available languages: fr