A generalized Predictive Contro l(GPC) has been implemented at Icelandic Alloys Ltd. Two ferrosilicon furnaces, for controlling the silicon content in tapped metal. The control is based on a mathematical model that predicts the silicon content one time step ahead. Tis prediction is used to decide the input of iron oxide, in order to adjust the predicted silicon content as close as possible to a specified, desired value. The use of GPC has resulted in decreased variations in the silicon content of tapped metal and the silicon content is kept closer to a desired value than before.
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