Hannover 2020 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 7: Atmospheric-pressure plasma and applications 2
P 7.7: Vortrag
Dienstag, 10. März 2020, 12:45–13:00, b305
Gliding arc plasmatron- plasma chemical reactor for methane conversion — Simon Böddeker, •Nikita Bibinov, and Peter Awakowicz — Institute for Electrical Engineering and Plasma Technology, Ruhr-University Bochum, 44801 Bochum, Germany
A gliding arc plasmatron (GAP) is applied as part of plasma chemical reactor for methane conversion and synthesis of carbon containing materials without associated carbon dioxide production. This plasma source can be operated in two different modes, namely gliding arc channel with diameter of 0.2-0.3 mm similar to conventional GA in vortex gas flow and plasma plume mode, with one (or several) hot and broad plasma object(s) with diameter 4-5mm incorporated into the gliding arc channel. Plasma conditions and efficiency of methane conversion in these two modes are very different. The first GAP mode is characterized by gas temperature of 2000K-2500K, electron density of about 1014 cm−3 and methane dissociation frequency of about 10 s−1. Under these plasma conditions mainly formation of methyl radicals is expected. Plasma of plasma plume is very hot, 5500K-6000K, electron density amounts to about 1015 cm−3 and frequency of thermal methane dissociation is about 107 s−1. Under these plasma conditions methane will be completely dissociated. In optimized GAP geometry, gas flow rate and electric current (200-300 mA) plasma plume has contact to the plasma reactor surface only via thin GA channels. At that material of electrodes is not thermal overloaded. Switching between modes is possible by variation of plasma reactor geometry and gas flow.