The characteristic of gliding arc in tornado was investigated under different experimental conditions and the destruction of PCDD/Fs (polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans) in medical waste incinerator fly ash by using a dc gliding arc in tornado reactor was studied in the present work. The results indicate that the arc fluctuation is depended on the tangential gas flow into the reactor, and its stability can be improved by increasing tangential flow rate. In addition, arc space can be enlarged by adding axial gas flow into the reactor. In this study, the fly ash was carried by the axial gas flow at 2 l/min and fed into the reactor. The dioxins contained in fly ash can be decomposed effectively by gliding arc in tornado. The average decomposition rate of concentration was 49.56%, and the average decomposition rate of I-TEQ was 62.29%. The decomposition rates of HxCDD/Fs were over 70%. The PCDFs were more easily decomposed than the PCDDs in the plasma reactor. The main destruction channel was proposed as the dechlorination reaction by analyzing the final PCDD/Fs homologues distributions.
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