Simultaneous wet desulfurization and denitration by an oxidant absorbent of NaClO/CaO.

The simultaneous wet removal performance of NO and SO was studied using the oxidant absorbent NaClO/CaO. The factors were studied including NaClO and CaO concentrations, reaction temperature, and gaseous components, such as SO, NO, O, and CO. The products in liquid and solid phases were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and ion chromatography to determine the mechanism of simultaneous desulfurization and denitration by NaClO/CaO. The results indicated that the removal efficiency of SO was in the range of 98-99.9%, and the removal efficiencies of NO and NO were 99.4% and 95.0%, respectively. The removal efficiencies of NO and NO increased with the increase of NaClO and CaO concentration and reaction temperature. The gaseous components had a stronger effect on NO removal efficiency, followed by NO removal efficiency, and SO removal efficiency. As SO concentration increased, the generation of sulfite species promoted the removal of NO and NO. Competition for NO and SO absorption by absorbent inhibited the removal efficiencies of SO and NO. The presence of O was beneficial for removing SO, NO, and NO, while the presence of CO was not. The main products in the liquid and solid phases were NO, NO, SO, and CaSO. The reaction mechanism for simultaneous wet removal of SO and NO by NaClO/CaO is proposed and discussed.