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Kinetic interpretation on mercury oxidation and transformation in simulated flue gases
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Journal Article
Kinetic interpretation on mercury oxidation and transformation in simulated flue gases
2013
Overview
The approach coupled with computation fluid dynamics (CFD) and complex
chemical kinetic computation to predict the oxidation of the elemental
mercury in flue gas was discussed in this paper. According to the
oxidation mechanism of the elemental mercury, the reactions which were
in close relationship with mercury oxidation were determined by the
sensitivity analysis method. The mercury oxidation process was
simulated under the atmospheric pressure condition with different
flue-gas compositions. The three-dimensional concentration distribution
of mercury within the cylindrical flue duct and the impact of the
temperature, concentration of Cl2, HCl, NO, and O2 on the mercury
oxidation were also obtained. The simulation results were compared with
the experimental results of Mamani-Paco and Widmer. The results show
that coupling computation solves the problem of the combination of the
CFD with the complex kinetic mechanism. The promotion effect of Cl2 on
the oxidation of elemental mercury is much better than that of HCl. The
temperature window ranged from 950 to 1,150 K for the higher oxidizing
rate of the elemental mercury was determined. The slight enhancement of
NO on mercury oxidization was observed which was controlled by the
competition between two reaction pathways. O2 weakly promotes
homogeneous Hg oxidation, especially under the condition of high
temperature. 1.1, 2.6 and 3.1 % of mercury was oxidized in the presence
of 0, 4 and 16 % O2 at 600 K, respectively. However, 12.5, 22.5 and
26.0 % of Hg oxidation has been obtained at 1,200 K.
Publisher
Center for Environment and Energy Research and Studies (CEERS),Springer-Verlag,Springer Nature B.V
Subject
