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

摘要

Oxidation of gas phase elemental mercury (Hg ) 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 Hg° increased with O_2 content, the residence time of flue gas in reactor and the applied voltage. The oxidation efficiency of Hg° reached over 96% under the applied voltage of 11 kV and the residence time of 0.24 s when the O_2 content in flue gas was 20%, and the corresponding energy efficiency was at about 14.1 pg kJ~(-1). It was noted that the oxidation efficiency of Hg° could still reach 80% when the O_2 content in flue gas was only 4% (near the actual O_2. content in flue gas of coal-fired boilers). The experimental results indicated that DBD plasma was one of the efficient technologies for purification of Hg° vapor industrial flue gas.