MetallurgicalEngi-The model derived in this paper is intended. for the testing of control strategies using off-gas variables in With the EAF in operation, the roof is closed, and off-gas is extracted through the duct in the roof. The off-gas system employs an extraction fan to pass the off-gas through a baghousefiltration system. Figure l gives a schematic description. For simplicity an equivalent fan without the baghouse and extraction fan is shown in Fig. l The scrap does not contain impurities that will be oxidized. In steel-making practice graded scrap is needed (Geldenhuisl6)) for low tramp e]ement requlrements in steel, to prevent high impurity content.
a b s t r a c tOften the most difficult step in establishing a control system is the development of a suitable dynamic process model. As such a model is not available elsewhere, a first principle dynamic mathematical model was developed for a coal dense medium separation circuit. Each unit operation was modelled individually and then integrated together to form a complete non-linear state-space model for the circuit. This model was used to simulate the process and it was validated using real process data derived from a plant experiment.When developing models from first principles, it is necessary to estimate the model parameters. These parameters, specifically for non-linear state-space relationships, require a unique solution. A parameter identifiability method was used to show that the non-linear dynamic models developed have unique parameters for a specific set of input-output data.
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