Abstract
A methematical model for estimating the profile of softening-melting zone and the radial gas distribution in the furnace in operation has been developed by use of the measured shaft gas pressures in the furnace.
Close agreement was obtained between the results of this estimation and the data obtained with other instruments in the furnace, and the accuracy of this estimation was satisfactory.
Indices representing the operation state in the furnace have been derived based on the results of this estimation, and the usefulness of these indices was confirmed for the control of the heat efficiency, reducibility, molten metal quality, permeability, material descending state, and so on.
Further, operation states were analysed in the case of a decrease in production and an increase in pellet ratio in burden based on the results of this estimation, and it was showed that the actual phenomena in the furnace could be analysed sufficiently and accurately.
