Étude théorique et expérimentale d’une torche plasma triphasée à arcs libres associée à un procédé de gazéification de matière organique

Abstract : Arc plasma torches are widely used in industrial applications. A 3-phase AC plasma technology with consumable graphite electrodes is under development at PERSEE MINES - ParisTech. This technology noticeably differs from the classical DC plasma torches and aims at overcoming a number of limits of plasma systems in terms of reliability, equipment and operating costs. In order to improve the understanding of the unsteady physical phenomena in such plasma systems, a theoretical and experimental study is conducted under non reactive condition (nitrogen, syngas). Experimental study is based on high speed video camera (100 000 frames per second) and electrical signal analyses. Theoretical analysis is based on 3D unsteady Magneto-Hydro-Dynamic (MHD) model of the arc zone using CFD software Code_Saturne®, by a parametric study based on current, frequency and plasma gas flow rate influence. Two configurations: coplanar and parallel electrodes are studied. These studies highlight the influence of electromagnetic and hydrodynamic phenomena on the arc motion. In coplanar electrode configuration, electrode jets appear to be the dominant parameter on the arc motion, heat transfer and arc ignition. In the parallel electrodes configuration, the motion of the hot channel seems to be the key parameter. Comparison between MHD modeling and experimental results shows a fair correlation, both in accordance with the arc behavior and the electrical waveform.
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Christophe Rehmet. Étude théorique et expérimentale d’une torche plasma triphasée à arcs libres associée à un procédé de gazéification de matière organique. Autre. Ecole Nationale Supérieure des Mines de Paris, 2013. Français. ⟨NNT : 2013ENMP0041⟩. ⟨pastel-00957380⟩

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