Abstract
A simplified dynamic model of blast furnace melting zone is developed and two approximate analyses on the dynamic characteristics are presented.
From the approximate analysis (I), it has been found that the equation for the accumulation of heat in coke zone can be expressed as the same form as the lumped-parameter system.
Applying a local linearization technique to the analysis (I), perturbation analysis (approximate analysis (II)) is developed. From this analysis (II) it has been shown theoretically that the dynamic characteristics of melting zone may be expressed as a combination of two first order lag systems, and that the time constant for the accumulation of heat in the coke zone 71 becomes considerably smaller than the time constant for the shift of melting zone level T.Also the effects of the volume of coke zone and the over-all heat transfer coefficient on the value of these time constants have been discussed in this paper.
