期刊
FUEL
卷 334, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.126734
关键词
Plasma -based conversion; CO 2 dissociation; CO 2 conversion; Power-2-X; Thermal plasma; Nozzle
This paper investigates the effects of post-plasma placement of a converging-diverging nozzle in a vortex-stabilized CO2 microwave plasma reactor on energy efficiency and conversion. Results show that the nozzle significantly improves energy efficiency and conversion, especially at low flow rates and subatmospheric pressure.
Transforming CO2 into value-added chemicals is crucial to realizing a carbon-neutral economy, and plasmabased conversion, a Power-2-X technology, offers a promising route to realizing an efficient and scalable process. This paper investigates the effects of post-plasma placement of a converging-diverging nozzle in a vortexstabilized 2.45 GHz CO2 microwave plasma reactor to increase energy efficiency and conversion. The CDN leads to a 21 % relative increase in energy efficiency (31 %) and CO2 conversion (13 %) at high flow rates and nearatmospheric conditions. The most significant performance improvement was seen at low flow rates and subatmospheric pressure (300 mbar), where energy efficiency was 23 % and conversion was 28 %, a 71 % relative increase over conditions without the CDN. Using CFD simulations, we found that the CDN produces a change in the flow geometry, leading to a confined temperature profile at the height of the plasma, and forced extraction of CO to the post-CDN region.
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