Abstract
For the computer control of temperature of billets in a heating furnace, the radiant heat transfer equation using the total heat exchange factor derived experimentally is widely used. There is, however, no good correspondence between measured billet temperature and calculated one during the transient state.
In this paper, the value of total exchange factor are estimated using the experimental data measured under the operating condition with different heavy oil flow rates. From the results, the model of radiant heat transmission energy is proposed as follows:
1) The furnace is divided into several zones according to heavy oil flow rates, and the total exchange factor can assume different values in each zone.
2) Parameters of the model are determined by the steepest descent method.
The proposed model is applied to the estimation of heating temperature of billets in the continuous furnace. It is assured that the accuracy of estimation remains within the allowable range even in the transient state.
