Direct Numerical Simulation of Ozone Injection Technology for NOxControl in Flue Gas

The ozone injection process for NO control was studied using an ozone−NO x reaction coflow jet by direct numerical simulation. A 65-step detailed kinetic mechanism for the O 3 −NO x reaction was developed and verified by our experiment and another published experiment. The detailed kinetic mechanism was incorporated into a 2D reaction jet flow and handled by Chemkin. The code was parallelized and run on a cluster system. The reactions between O 3 and NO x are relatively slow compared to the turbulence time scale. The chemical reactions occur mostly in the core of all kinds of vortexes. The dynamics of vortexes make a great contribution to the mixing of the reactants and reactions. The vortexes begin to roll up alternately at about 7 d from the root of the jet. The order of the two-line vortexes become disordered after 10 d . NO 2 is the main product of the O 3 −NO reactions, NO 3 and N 2 O 5 are the minority products. Favre averaged results show that about 45.44% of NO can be oxidized by O 3 at the 30 d outlet of the computational domain.