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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.6: Poster

Mittwoch, 22. März 2023, 17:30–19:00, HSZ EG

Space resolved temperature measurements in an atmospheric pressure argon methane microwave plasma — •Simon Kreuznacht, Marc Böke, and Achim von Keudell — Experimental Physics II, Ruhr University Bochum, Germany

Hydrogen is often envisioned as the energy carrier and green fuel of the future. However, new energy efficient and greenhouse gas free production methods are needed to utilize hydrogen as energy carrier on larger scales. A promising production method is the pyrolysis of methane in a microwave plasma. Here, we present a microwave plasma torch operated in an argon methane mixture (60 slm total flow rate, up to 35 % methane admixture) at atmospheric pressure. Microwaves with a frequency of 2.45 GHz and up to 6 kW of forward power are used to sustain the plasma. The methane is converted to hydrogen, solid carbon, acetylene and ethylene inside the plasma. The emission spectrum from the plasma is dominated by black body radiation from hot carbon particles and the dicarbon Swan bands. Broadband spectra of the black body radiation and high-resolution spectra of the dicarbon Swan bands are used to estimate the space resolved gas temperature from the black body temperature and the dicarbon rotational temperature. In the center the plasma reaches temperatures of up to 4600 K with large gradients of about 500 K in radial direction and 50 K in axial direction.