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Experimental Study on Demercurization Performance of Wet Flue Gas Desulfurization System
Author(s) -
Bao Jingjing,
Yang Linjun,
Yan Jinpei
Publication year - 2009
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200990376
Subject(s) - chemistry , flue gas desulfurization , mercury (programming language) , reagent , flue gas , sulfur , elemental mercury , environmental chemistry , inorganic chemistry , organic chemistry , computer science , programming language
The demercurization performance of wet flue gas desulfurization (WFGD) system was investigated by measuring mercury concentrations at the inlet and outlet of WFGD system with a QM201H mercury analyzer. The selected desulfurizer included NH 3 ·H 2 O, NaOH, Na 2 CO 3 , Ca(OH) 2 and CaCO 3 . The influences of adding oxidant and coagulant such as KMnO 4 , Fenton reagent, K 2 S 2 O 8 /CuSO 4 and Na 2 S into desulfurization solutions were also studied. The results show that elemental mercury is the main component of gaseous mercury in coal‐fired flue gas, and the proportion of oxidized mercury is less than 36%. Oxidized mercury could be removed by WFGD system efficiently, and the removal efficiency could amount to 81.1%–92.6%. However, the concentration of elemental mercury slightly increased at the outlet of WFGD as a result of its insolubility and re‐emission. Therefore, the removal efficiency of gaseous mercury is only 13.3%–18.3%. The mercury removal efficiency of WFGD system increased with increasing the liquid‐gas ratio. In addition, adding KMnO 4 , Fenton reagent, K 2 S 2 O 8 /CuSO 4 and Na 2 S into desulfurization solutions could increase the mercury removal efficiency obviously. Various additives have different effects, and Na 2 S is demonstrated to be the most efficient, in which a mercury removal efficiency of 67.2% can be reached.