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P: Fachverband Plasmaphysik

P 8: Atmospheric Plasmas and their Applications III

P 8.3: Vortrag

Dienstag, 1. April 2025, 14:30–14:45, ZHG006

Process optimization of iron oxide (in-flight) reduction in a high-performance microwave argon-hydrogen plasma torch — •Jonas Thiel, Simon Kreuznacht, Marc Böke, and Achim von Keudell — Experimental Physics II - Reactive Plasmas, Ruhr University Bochum, Bochum, Germany

Using an argon-hydrogen microwave plasma torch, the experiments aim at advancing nearly climate-neutral iron ore reduction. These atmospheric-pressure hydrogen plasmas provide advantages such as faster reduction rates, lower energy consumption, in-flight treatment, and scalability compared to other methods. The experimental setup can be used in two operation modes: exposing defined sample amounts to the plasma effluent or directly injecting iron oxide powder into the gas flow for in-flight treatment. A swirl-like flow pattern is employed to shield the reactor's quartz tube from the hot core. However, for the latter case, this swirl also leads to particles being adhered to the wall before reaching the collection system. Therefore, an optimization of the process parameters assisted by fluid simulations examining particle trajectories, residence times, and melting/evaporation behavior under varied flow and geometric conditions is crucial for efficient long-term in-flight treatment. In addition, optical emission spectroscopy and X-ray diffraction are employed to analyze on the one hand plasma properties as gas temperature and electron density/temperature, and on the other hand the reduction degree of treated samples.

Keywords: Microwave plasma torch; In-flight iron oxide reduction; Atmospheric pressure hydrogen plasma; X-ray diffraction; Optical emission spectroscopy