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J Hazard Mater. 2014 Mar 15;268:237-45. doi: 10.1016/j.jhazmat.2014.01.022. Epub 2014 Jan 24.

Performance evaluation of non-thermal plasma injection for elemental mercury oxidation in a simulated flue gas.

Author information

1
Institute of Electrostatics and Special Power, Dalian University of Technology, Dalian 116024, PR China; Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education of the People's Republic of China, Dalian 116024, PR China.
2
Shandong Electric Power Research Institute, Jinan 250002, PR China.
3
Institute of Electrostatics and Special Power, Dalian University of Technology, Dalian 116024, PR China; Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education of the People's Republic of China, Dalian 116024, PR China. Electronic address: lijie@dlut.edu.cn.

Abstract

The use of non-thermal plasma (NTP) injection approach to oxidize elemental mercury (Hg(0)) in simulated flue gas at 110°C was studied, where a surface discharge plasma reactor (SDPR) inserted in the simulated flue duct was used to generate and inject active species into the flue gas. Approximately 81% of the Hg(0) was oxidized and 20.5μgkJ(-1) of energy yield was obtained at a rate of 3.9JL(-1). A maximal Hg(0) oxidation efficiency was found with a change in the NTP injection air flow rate. A high Hg(0) oxidation efficiency was observed in the mixed flue gas that included O2, H2O, SO2, NO and HCl. Chemical and physical processes (e.g., ozone, N2 metastable states and UV-light) were found to contribute to Hg(0) oxidation, with ozone playing a dominant role. The deposited mercury species on the internal surface of the flue duct was analyzed using X-ray photoelectron spectroscopy (XPS) and electronic probe microanalysis (EPMA), and the deposit was identified as HgO. The mercury species is thought to primarily exist in the form of HgO(s) by adhering to the suspended aerosols in the gas-phase.

KEYWORDS:

HgO; Mercury oxidation; Non-thermal plasma injection; Surface discharge plasma reactor

PMID:
24513449
DOI:
10.1016/j.jhazmat.2014.01.022
[Indexed for MEDLINE]
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