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Optimisation des installations de chauffage de billettes par induction électromagnétique dans l’industrie de la forge afin d’améliorer son efficacité énergétique

Abstract : The first part of this dissertation gives an overview of thirty years of research work done in the frame of EDF R&D Division in the domain of industrial induction heating. The different works concerned many themes: numerical modelling, expertise in induction heating in conventional sectors, development of innovative solutions in other industrial sectors, project management inside EDF first, then collaborative projects with French or European financial support, international recognition and support for young researchers.The second part shows a summary of the most relevant scientific works which leaded to a software of billet induction heating optimisation in order to improve its energy efficiency. Numerical modelling is approached in a 1D configuration, coupling an electromagnetic model using a finite elements and step by step in time method with a thermal transient model using an implicit finite difference method. The validity domain is extended thanks to the use of an attenuation coefficient applied to the magnetic field. Works regarding inductor allows to describe more accurately the electrical (resistance) and thermal (cooling) behaviour; a solution for energy recovery is also proposed. The simplified model of the resonant inverter supplying the inductor allows to describe globally its behaviour without going deep in the details of the power electronics: following the resonant frequency of the oscillating circuit, adapting the set points to the circuit impedance and the power supply limitations. Electromagnetic physical data of metals and their evolution with temperature are measured with a tailor-made equipment. All these works are validated by comparison with more complex numerical models or with experiments. Energy optimisation procedures for the heating device are developed, acting either on the line electrical parameters or on the design of a new inductor.PhD dissertation presented in the frame of the “Validation of Professional Experience”
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Bernard Paya. Optimisation des installations de chauffage de billettes par induction électromagnétique dans l’industrie de la forge afin d’améliorer son efficacité énergétique. Autre [cond-mat.other]. Université Grenoble Alpes, 2017. Français. ⟨NNT : 2017GREAI115⟩. ⟨tel-01762167⟩

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