Abstract
A surface dielectric barrier discharge plasma reactor was employed to study Hg0 oxidation in coal-fired flue gas. The experimental results showed that 98 % of Hg0 oxidation efficiency and 13.7 μg kJ−1 of energy yield were obtained under a specific energy density (SED) of 7.9 J L−1. Increasing SED was beneficial for Hg0 oxidation due to higher production of active species. Higher initial concentration resulted in lower Hg0 oxidation efficiency, but higher amount of Hg0 oxidation. Water vapor inhibited Hg0 oxidation because the generation of O3 was suppressed. The presence of NO remarkably restrained Hg0 oxidation, while SO2 showed little effect on Hg0 oxidation. Roles of active species in Hg0 oxidation were examined under different gas atmospheres (O2 and air), indicating that O3 played an important role in Hg0 oxidation. Deposits on the internal surface of the reactor were analyzed by energy dispersive spectroscopy and the product was identified as HgO.
Highlights
Mercury has been listed as a hazardous and toxic pollutant under Title III of the 1990 Clean Air Act Amendments (CAAA) in the United States because of its volatility, persistence and bioaccumulation as methylmercury in the environment and its neurological health impactsJ
Increasing specific energy density (SED) leads to the production of more plasma channels and chemically active species, Hg0 oxidation efficiency is enhanced
Hg0 oxidation efficiency of 80 % achieved at SED of 0.8 J L-1, indicated that Surface DBD (SDBD) showed excellent performance of Hg0 oxidation
Summary
The objective of the study is to evaluate Hg0 oxidation performance of SDBD, and the important parameters including energy input, Hg0 initial concentration, gas atmospheres, and flue gas components (H2O, NO, SO2) were examined
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