oxidation for sintering/pelleting flue gas

Based on the demand of sintering/pelleting flue gas ultra-low emission, a semi-dry method using a spray dryer absorber (SDA) combined with O 3 oxidation was proposed for simultaneous removal of SO 2 and NO. Effects of O 3 injection site, O 3 /NO molar ratio, and spray tower temperature on the removal efficiencies were investigated. It was revealed that both desulfurization and denitrification efficiencies could reach to 85% under the conditions of setting O 3 injection site inside of tower, O 3 /NO molar ratio 1.8, spray tower temperature 85 °C, Ca/(S + 2 N) molar ratio 2.5 and slurry flow rate 300 mL/hr. CaSO 3 /Ca(OH) 2 mixture slurry was used as absorbent to simulate operating conditions in iron and steel industry. The result shows that the addition of CaSO 3 weakens both removal efficiencies. In addition, the reaction mechanism of simultaneous removal of SO 2 and NO using SDA combined with O 3 oxidation was proposed. © 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.