Electrohydrodynamically induced secondary flow in non-thermal plasma reactor and its effect on flue gas NOx cleaning

摘要

Laser-induced fluorescence (LIF) proved to be a useful diagnostic method for in-situ two-dimensional observation of the discharge-induced plasma chemistry processes responsible for NOx decomposition occurring in nonthermal plasma reactors. Using this powerful technique, It was found that the corona discharge-induced removal of NO molecules in a needle-to-plate and corona radical shower nonthermal plasma reactors occurs not only in the vicinity of the plasma region formed by the corona streamers and in the downstream region of the reactor but also in the upstream region of the reactor. The study, carried out using other laser techniques, i.e. the laser visualization and particle image visualization (PIV), showed that a strong electrohydrodynamic (EHD) flow from the discharge electrode towards both the upstream and downstream directions of the main flow is formed.