Simultaneous removal of SO2 and NO using a spray dryer absorption(SDA) method combined with O3 oxidation for sintering/pelleting flue gas  

作　　者：Maoyu Cai Xiaolong Liu Tingyu Zhu Yang Zou Wenliang Tao Mengkui Tian 

机构地区：[1]School of Chemistry and ChemicalEngineering,Guizhou Uniuersity,Guiyang 550025,China [2]National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [3]Center for Excellence in Regional Atmospheric Enuironment,Institute of Urban Enuironment,Chinese Academy of Sciences,Xiamen 361021,China

出　　处：《Journal of Environmental Sciences》2020年第10期64-71,共8页环境科学学报（英文版）

基　　金：supported by the Nationals Key Research and Development Program of China (No.2017YFC0210600);the National Natural Science Foundation of China (No.51978644)。

摘　　要：Based on the demand of sintering/pelleting flue gas ultra-low emission,a semi-dry method using a spray dryer absorber (SDA) combined with O3 oxidation was proposed for simultaneous removal of SO2 and NO.Effects of O3 injection site,O3/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 O3 injection site inside of tower,O3/NO molar ratio 1.8,spray tower temperature 85°C,Ca/(S+2N) molar ratio 2.5 and slurry flow rate 300 m L/hr.CaSO3/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 CaSO3 weakens both removal efficiencies.In addition,the reaction mechanism of simultaneous removal of SO2 and NO using SDA combined with O3 oxidation was proposed.

关 键 词：O_3 oxidation Desulfurization DENITRIFICATION Semi-dry method Spray dryer absorption 

分 类 号：X757[环境科学与工程—环境工程]