Carbon dioxide dissociation in a microwave plasma reactor operating in a wide pressure range and different gas inlet configurations
| Autor: | Sabine Paulussen, Vincent Vermeiren, Igor Belov, Annemie Bogaerts |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology Drop (liquid) 02 engineering and technology Plasma Mechanics 021001 nanoscience & nanotechnology 01 natural sciences 7. Clean energy Dissociation (chemistry) Ion source Vortex Chemistry chemistry.chemical_compound chemistry 0103 physical sciences Carbon dioxide Chemical Engineering (miscellaneous) Vacuum chamber 0210 nano-technology Waste Management and Disposal Microwave |
| Zdroj: | Journal of CO2 utilization |
| ISSN: | 2212-9820 |
| DOI: | 10.1016/j.jcou.2017.12.009 |
| Popis: | Microwave (MW) plasmas represent a promising solution for efficient CO2 dissociation. MW discharges are also very versatile and can be sustained at various pressure and gas flow regimes. To identify the most favorable conditions for the further scale-up of the CO2 decomposition reaction, a MW plasma reactor operating in pure CO2 in a wide pressure range (200 mbar-1 bar) is studied. Three different gas flow configurations are explored: a direct, reverse and a vortex regime. The CO2 conversion and energy efficiency drop almost linearly with increasing pressure, regardless of the gas flow regime. The results obtained in the direct flow configuration underline the importance of post-discharge cooling, as the exhaust of the MW plasma reactor in this regime expanded into the vacuum chamber without additional quenching. As a result, this system yields exhaust temperatures of up to 1000 K, which explains the lowest conversion (similar to 3.5% at 200 mbar and 2% at 1 bar). A post-discharge cooling step is introduced for the reverse gas inlet regime and allows the highest conversion to be achieved (similar to 38% at 200 mbar and 6.2% at 1 bar, with energy efficiencies of 23% and 3.7%). Finally, a tangential gas inlet is utilized in the vortex configuration to generate a swirl flow pattern. This results in the generation of a stable discharge in a broader range of CO2 flows (15-30 SLM) and the highest energy efficiencies obtained in this study (similar to 25% at 300 mbar and similar to 13% at 1 bar, at conversions of 21% and 12%). The experimental results are complemented with computational fluid dynamics simulations and with the analysis of the latest literature to identify the further research directions. |
| Databáze: | OpenAIRE |
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