Nonlinear model predictive control of a continuous slab reheating furnace |
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Authors: | A. Steinboeck D. Wild A. Kugi |
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Affiliation: | 1. Automation and Control Institute, Vienna University of Technology, Gußhausstraße 27–29, 1040 Wien, Austria;2. Aktiengesellschaft der Dillinger Hüttenwerke, Werkstrasse 1, 66763 Dillingen/Saar, Germany |
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Abstract: | A nonlinear model predictive controller is designed for a continuous reheating furnace for steel slabs. Based on a first-principles mathematical model, the controller defines local furnace temperatures so that the slabs reach their desired final temperatures. The controller is suitable for non-steady-state operating situations and reaching user-defined desired slab temperature profiles. In the control algorithm, a nonlinear unconstrained dynamic optimization problem is solved by the quasi-Newton method. The design of the controller exploits the fact that the considered slab reheating furnace is a continuous production process. Long-term measurement results from an industrial application of the controller demonstrate its reliability and accuracy. |
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