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Abstract |
We investigated post-plasma gas quenching in an arc plasma for CO2 conversion. We present experiments with a basic pin reactor, along with four different methods for quick cooling, i.e., a nozzle, wall cooling, combining the nozzle and wall cooling, and a heat exchanger. We demonstrate that quenching can significantly improve the performance. The best results are obtained with a heat exchanger, enhancing the conversion with a factor three (from 6 to above 18 %) and the energy efficiency with a factor 1.5 (from 20 to 30 %) when compared to the benchmark. Temperature measurements indeed confirm that the heat exchanger provides the most effective
cooling. In addition, the heat exchanger ensures a more stable and elongated plasma which further improves the performance. Interestingly, we observe a linear increase between conversion and specific energy input, resulting in a constant energy efficiency of about 30 %, which is very promising for further upscaling towards higher specific energy input. |
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