Study on high-frequency dielectric barrier discharge reactor structure

To study decomposition of formaldehyde with high-frequency dielectric barrier discharge, the influence of parameters of DBD reactor structure on decomposition of formaldehyde is investigated, and the removal mechanism of formaldehyde by the low temperature plasma from DBD is analyzed. The experimental results show that the central electrode diameter and the internal diameter of dielectric tube significantly influence the decomposition efficiency of formaldehyde. Both diameters ought to be optimized to maximize the decomposition efficiency. As a discharge electrode of the reactor, tungsten filament is better than brass wire and stainless steel wire. Adopting 99 ceramic tubes with higher relative dielectric constant as dielectric barrier, the decomposition efficiency of formaldehyde is increased from 41% to 76%. The reaction length has an optimum value when power is fixed.