Validation of the thermo-chemical approach to modelling of the CO2 conversion in atmospheric pressure microwave gas discharges
Abstract
The 2.45 GHz plasma torch CO2 CO + 12O2 conversion experiment [F A D"Isa et al. Plasma Sources Sci. Technol., vol. 29 (2020) 105009] has been compared with thermo-chemical calculations. The 1.5D model of the CO2/CO/O2/O/C mixture without turbulent transport has been used with plasma acting only as prescribed heat source. The parameter range covered is specific energy input SEI=0.3..5 eV/molecule at pressure p=0.9 bar, and SEI=0.6..2 eV/molecule at p=0.5, 0.2 bar. The calculated conversion rates are always in good agreement with experiment. At the same time, the calculated temperatures T may deviate significantly from the experiment, especially for p=0.2 bar. The calculated T were found to be sensitive with respect to uncertain model parameters, but are not sensitive. The model indicates that the conversion process is essentially two-dimensional and that the main factor which reduces the energy efficiency is re-oxidation of CO downstream from the plasma region. The proposed physico-chemical model (chemical mechanism plus transport coefficients) can be suggested for practical calculations for p≥0.5 bar.
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