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A novel semi‐dry method for the simultaneous removal of Hg and SO 2 using spray drying absorption method
Author(s) -
Yi Honghong,
Du Chengcheng,
Ma Yueqiang,
Tang Xiaolong,
Zhao Shunzheng,
Gao Fengyu,
Yang Zhongyu,
Huang Yonghai,
Yang Kun,
Xie Xizhou
Publication year - 2020
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6328
Subject(s) - chemistry , oxidizing agent , sulfur dioxide , mercury (programming language) , solubility , data scrubbing , absorption (acoustics) , wet scrubber , aqueous solution , nuclear chemistry , inorganic chemistry , flue gas , waste management , materials science , organic chemistry , programming language , computer science , engineering , composite material
Abstract BACKGROUND A novel semi‐dry method called SDA (spray drying absorption) for the simultaneous removal of mercury (Hg 0 ) and sulfur dioxide (SO 2 ) have been proposed in this article, in which Hg 0 was initially oxidized by gaseous oxidant (O 3 ) and liquid oxidant (K 2 S 2 O 8 , H 2 O 2 , and NaClO 2 ), after which SO 2 and Hg 2+ were absorbed by Ca(OH) 2 . RESULTS The effects on different process conditions and additives on Hg 0 removal were explored at first, and the results indicated that the Hg removal efficiency could be improved by oxidizing or extending the residence time of the liquid phase reaction. When SO 2 and Hg coexist in the atmosphere, additives including oxidants or composite additives were added into the mixed system, and the results indicated that the best removal efficiency of SO 2 and Hg was about 99.5% and 51% respectively. CONCLUSION Since SO 2 has good water solubility, it would affect the oxidation of Hg and the removal of Hg. When there was nitric oxide (NO) in the atmosphere, a new stable product was generated which contributed to the removal of Hg, and the removal efficiency of SO 2 and Hg was about 99.5% and 57% respectively. © 2020 Society of Chemical Industry