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论文类型：期刊论文

发表时间：2014-03-15

发表刊物：JOURNAL OF HAZARDOUS MATERIALS

收录刊物：SCIE、EI、PubMed、Scopus

卷号：268

页面范围：237-245

ISSN号：0304-3894

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

摘要：The use of non-thermal plasma (NTP) injection approach to oxidize elemental mercury (Hg-0) in simulated flue gas at 110 degrees 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 20.5 mu g kJ(-1) of energy yield was obtained at a rate of 3.9 J L-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 O-2, H2O, SO2, NO and HCl. Chemical and physical processes (e.g., ozone, N-2 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. (C) 2014 Published by Elsevier B.V.