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SMuK 2023 – scientific programme

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P: Fachverband Plasmaphysik

P 4: HEPP II

P 4.1: Talk

Monday, March 20, 2023, 16:30–16:55, CHE/0091

CO2 dissociation using a microwave plasma torch - a study on industrially relevant parameters — •Christian Karl Kiefer1, Rodrigo Antunes1, Ante Hecimovic1, Arne Meindl1, and Ursel Fantz1,21Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany — 2University of Augsburg, 86159 Augsburg, Germany

Under laboratory conditions, microwave plasma torches are known to be an energetically highly efficient CO2 conversion technology, for pressures ranging from 100 mbar up to atmospheric pressure. However, issues relevant for industrial application such as the wall-plug energy efficiency, including the energy consumption of peripheral equipment, the performance for impure CO2 streams directly from carbon capture facilities and the stability at long-term operation are usually not addressed. To fill that gap, the wall-plug energy efficiency of a lab-scale microwave plasma torch was determined reaching values up to 17.9%, corresponding to an electrical power consumption of 19.6 kWh per produced Nm3 of carbon monoxide. The effect of Ar, N2, O2 and air admixture to the CO2 feed gas stream was investigated. Experiments show that small amounts of nitrogen can even increase energy efficiency whereas the most detrimental effect on CO2 dissociation was found for air admixture. Finally, a durability test over 29 h was performed, demonstrating that microwave plasma torch operation is very reproducible and stable in all figures of merit with short ramp-up times, making it a promising technology for intermittent operation.

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