An experimental study on reactions of NO and flue gas carrying char at grate firing conditions

To meet the progressively more stringent environmental requirements, further reducing NOx emission is needed. To identify an effective way of reducing NOx emission, this paper investigated the effects of oxygen concentration and pre-oxidation treatment on char-NO reactions using tube furnace. By adding oxygen into the reacting environment, the important role of oxygen on the reaction between NO and large particle size char was studied under the condition of constant temperature heating. Results indicate that high oxygen concentrations can promote the char-NO reaction compared to the low oxygen or anaerobic conditions. With high oxygen concentration, the change of experimental temperature has little effect on char-NO reaction. After pre-oxidation treatment, however, the capacity of char on NO reduction is improved.