Simultaneous Removal of SO2 and NO by Sodium Chlorite Solution in Wetted-Wall Column

Hyung-Keun Lee; Bal Raj Deshwal; Kyung-Seun Yoo

Korean Journal of Chemical Engineering, Vol.22, No.2, 208-213, March, 2005

DOI10.1007/BF02701486 Export Citation

Simultaneous Removal of SO2 and NO by Sodium Chlorite Solution in Wetted-Wall Column

Hyung-Keun Lee^†, Bal Raj Deshwal¹, and Kyung-Seun Yoo¹

Flue Gas Treatment Centre, Korea Institute of Energy Research, Daejeon 305-600, Korea
¹Department of Environmental Engineering, Kwangwoon University, Seoul 139-701, Korea

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The effect of feeding rate of NaClO2 solution, inlet SO2 and NO concentration, [NaClO2]/[SO2+NO] molar ratio ( η), L/G ratio and, solution pH on the simultaneous removal of SOx/NOx has been investigated in a wetted-wall column. Both SOx and NOx removal efficiencies are enhanced with the increasing feeding rate of NaClO2 solution and attain a steady state. NOx removal efficiency increases with increasing SO2 concentration, but SOx removal remains unaffected with increasing NO concentration. In an acidic medium, DeSOx and DeNOx efficiency increased with increasing [NaClO2]/[SO2+NOx] molar ratio and attained a steady state. NOx removal starts only after the complete removal of SOx. The excess of NaClO2 does not enhance NOx removal efficiency. Solution pH does not affect the DeSOx and DeNOx efficiency. The maximum SOx and NOx removal efficiencies achieved at the typical operating conditions of commercialized FGD processes are about 100 and 67%, respectively.

Keywords:NaClO2;Wetted Wall Column;Removal Efficiency;DeSOx;DeNOx

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[4] Chien T, Chu H, J. Hazard. Mater., B80, 43 (2000)

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[6] Cooper CD, Alley FC, Air Pollution Control: A Design Approach, 2nd Ed., Waveland Press, Inc., Illinois, 454 (1994)

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[9] Feng XB, Hall WK, Catal. Lett., 41(1-2), 45 (1996)

[10] Harriott P, Smith K, Benson LB, Environ. Prog., 12, 110 (1993)

[11] Heck MH, Farrauto RJ, Catalytic Air Pollution Control: Commercial Technology, Van Nostrand Reinhold, New York (1995)

[12] Hsu HW, Lee CJ, Chou KS, Chem. Eng. Commun., 170, 67 (1998)

[13] Kieffer RG, Gordon G, Inorg. Chem., 7, 239 (1968)

[14] Lancia A, Musmarra D, Pepe F, Ind. Eng. Chem. Res., 36(1), 197 (1997)

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