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Dynamic modeling and supervision of continuous steel reheating furnaces

Diala Abdo
Abstract : The work consists of dynamic modeling of continuous steel reheating furnaces and of the development of an on-line control logic. The first part presents the elaboration of a global dynamic model of a reheating furnace where only the energy equation and the continuity equation are applied through the use and the improvement of THERMETTE a software developed by the Centre for Energy and Processes (CEP). The model is valid for all types of furnaces thanks to the interface of SAFIR-4D a computational tool developed for Stein-Heurtey. Using this interface, the description of any furnace generates automatically the dynamic model after calculation of the radiative transfer factors of the said furnace. Transfer factors are calculated by the "Check" method, which allows fast calculation of radiative transfer factors developed in this thesis, coupled to MODRAY a software of the CEP. The numerical validation of the "Check" method allows to demonstrate its precision and its advantages in terms of significant savings of calculation time. The experimental validation, based on one instrumented slab circulating in a furnace, shows the consistency of the global dynamic model coupled to the radiative transfer factors obtained by the "Check" method. The calculated temperatures, mass flow rates of products and the thermal balance are in good agreement with measurements. The second part of the work covers the on-line supervision of a reheating furnace. The dynamic model developed in the first part is used as an analog of a real furnace and so provides data for the on-line operation of the furnace. The control development combines prevision and optimization algorithms. The fast and on-online prevision of the slab temperatures allows to obtain data necessary to the optimization, which function is to update the data sets of the furnace in order to verify the technical-economical criterion of production. The control is then validated by comparison between the results of tests and those obtained by a classical control with constant data sets. Results in terms of energy consumption and temperature criteria on various slabs are satisfactory.
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Submitted on : Wednesday, March 7, 2007 - 8:00:00 AM
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Diala Abdo. Dynamic modeling and supervision of continuous steel reheating furnaces. Engineering Sciences [physics]. École Nationale Supérieure des Mines de Paris, 2006. English. ⟨pastel-00002236⟩

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