Dual-course dielectric barrier discharge with a novel hollow micro-holes electrode to efficiently mitigate NO.

The effect of a novel hollow annular micro-hole electrode on the DBD de-NO performance was investigated. The experimental results show that the hollow electrode allows the feed gas to take full advantage of the redundant heat of the electrode, thus reducing the energy consumption of the system. Subsequently, the micro-hole structure can improve the uniformity of feed gas in the plasma channel and prolong the residence time of the feed gas in the plasma channel. The reactor can also raise the temperature of the feed gas and enhance the plasma electric field. The optimum NO removal efficiency of about 82.6% is achieved at 16 annular micro-holes. Compared to the rod electrode reactor, the novel electrode reactor shows 19.7% reduction in energy consumption and 13.2% enhancement in de-NO efficiency. The calculations of de-NO mechanism show that the NO concentration decays significantly as the feed gas residence time increases, accompanied by a slight increase in NO concentration. The NO concentration marginally increases while NO concentration slightly decreases as the increase of feed gas temperature. DBD de-NO presents the mode of accelerated reduction of NO, essential removal of NO, and gradual consumption of NO with the reduced electric field increases.