Oxidative Removal of Elemental Mercury in Flue Gas by DBD Discharge Plasma

Abstract:

Oxidation of gas phase elemental mercury (Hg⁰) in the simulated flue gas by DBD plasma under atmospheric pressure and ambient temperature (298 K) was conducted. Experimental results indicated that the oxidative efficiency of Hg⁰ increased with O₂ content, the residence time of flue gas in reactor and the applied voltage. The oxidation efficiency of Hg⁰ reached over 96% under the applied voltage of 11 kV and the residence time of 0.24 s when the O₂ content in flue gas was 20%, and the corresponding energy efficiency was at about 14.1 μg kJ^-1. It was noted that the oxidation efficiency of Hg⁰ could still reach 80% when the O₂ content in flue gas was only 4% (near the actual O₂ content in flue gas of coal-fired boilers). The experimental results indicated that DBD plasma was one of the efficient technologies for purification of Hg⁰ vapor industrial flue gas.

• Periodical: Advanced Materials Research (Volumes 518-523)
• Pages: 2621-2624
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.518-523.2621
• Online since: May 2012
• Authors: Yu Ze Jiang, Jiu Tao An, Ke Feng Shang, Na Lu, Jie Li, Yan Wu
• Keywords: Electric Barrier Discharge, Elemental Mercury, Flue Gas, Plasma

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