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O_(3)oxidation combined with semi-dry method for simultaneous desulfurization and denitrification of sintering/pelletizing flue gas

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Journal of Environmental Sciences 2021年第6期33卷 253-263页

作者： Fagao Liu Maoyu Cai Xiaolong Liu Tingyu Zhu Yang Zou CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringInnovation Academy for Green ManufactureChinese Academy of SciencesBeijing 100190China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

With the vigorous development of China's iron and steel industry and the introduction of ultra-low emission policies,the emission of pollutants such as SO_(2)and NO x has received unprecedented attention.Considering the increase of the proportion of semi-dry desulfurization technology in the desulfurization process,several semi-dry desulphurization technologies such as flue gas circulating fluidized bed(CFB),dense flow absorber(DFA)and spray drying absorption(SDA)are briefly summarized.Moreover,a method for simultaneous treatment of SO_(2)and NOx in sintering/pelletizing flue gas by O_(3)oxidation combined with semidry method is introduced.Meantime,the effects of key parameters such as O_(3)/NO molar ratio,Ca SO_(3),SO_(2),reaction temperature,Ca/(S+2 N)molar ratio,droplet size and approach to adiabatic saturation temperature(AAST)on denitrification and desulfurization are analyzed.Furthermore,the reaction mechanism of denitrification and desulfurization is further elucidated.Finally,the advantages and development prospects of the new technology are proposed.

关键词： O_(3) Oxidation semi-dry method Sintering/pelletizing flue gas Desulfurization and denitrification

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

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Journal of Environmental Sciences 2020年第10期32卷 64-71页

作者： Maoyu Cai Xiaolong Liu Tingyu Zhu Yang Zou Wenliang Tao Mengkui Tian School of Chemistry and ChemicalEngineering Guizhou UniuersityGuiyang 550025China National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Center for Excellence in Regional Atmospheric Enuironment Institute of Urban EnuironmentChinese Academy of SciencesXiamen 361021China

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

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Desorption of Cl^(-) from Mg-Al layered double hydroxide intercalated with Cl^(-) using CO_(2) gas and water

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Chinese Journal of Chemical Engineering 2021年第1期34卷 131-134页

作者： Tomohito Kameda Hiroki Uchida Shogo Kumagai Yuko Saito Keiichi Mizushina Ichirou Itou Tianye Han Toshiaki Yoshioka Graduate School of Environmental Studies Tohoku University6-6-07 AobaAramakiAoba-kuSendai 980-8579Japan Kurita Water Industries Ltd. Nakano Central Park East4-10-1 NakanoNakano-kuTokyo 164-0001Japan

Mg-Al layered double hydroxide intercalated with CO_(3)^(2-)(CO_(3)·Mg-Al LDH) is effective for treating HCl exhaust gas.HCl reacts with CO_(3)^(2-) in CO_(3)·Mg-Al LDH, resulting in the formation of Cl·Mg-Al LDH.We propose that CO_(2) can be used for the desorption of Cl^(-)from Cl·Mg-Al LDH to regenerate CO_(3)·Mg-Al LDH.Herein,we studied the desorption of a from CI-Mg-Al LDH by adding water to Cl·Mg-Al LDH and blowing CO_(2) into it.We also analyzed the effects of temperature and water addition speed on the desorption of CI^(-)from Cl·Mg-Al LDH.Our results show that the added water adhered to CI·Mg-Al LDH and that CO_(2) in the gaseous phase was dissolved in this adhered water,thus generating CO_(3)^(2-).Therefore,anion exchange occurred between CO_(3)^(2-) and Cl^(-)in the Cl·Mg-Al LDH,thus desorbing Cl^(-).

关键词： Mg-Al layered double hydroxide CO_(2)gas Cl^(-)desorption semi-dry method

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