In this context,
all material flows emitted by power plants need to be taken
into account. In any case, increasing co-removal efficiency of Hg
by existing air pollution control devices reduces operating costs
of Hg specific control technologies.
The interactions of Hg with other flue gas components are of
complex nature. Due to the high temperatures in the combustion
chamber, the thermodynamic equilibrium of reactions of Hg is
shifted to its elemental form (Hg0). With decreasing temperature
and affected by the flue gas composition, gaseous Hg0 undergoes
oxidation to divalent mercury (Hg2+) by hydrogen halides. For typical
coal derived flue gases, HCl is the dominant hydrogen halide,
thus mainly HgCl2 is formed. If HBr concentration of the flue gas
is increased by the use of additives, HgBr2 concentration increases
accordingly. The heterogeneous oxidation of Hg0 is catalyzed by
high-dust SCR DeNOx systems, resulting in higher shares of HgCl2
and/or HgBr2 [6].
In this context,all material flows emitted by power plants need to be takeninto account. In any case, increasing co-removal efficiency of Hgby existing air pollution control devices reduces operating costsof Hg specific control technologies.The interactions of Hg with other flue gas components are ofcomplex nature. Due to the high temperatures in the combustionchamber, the thermodynamic equilibrium of reactions of Hg isshifted to its elemental form (Hg0). With decreasing temperatureand affected by the flue gas composition, gaseous Hg0 undergoesoxidation to divalent mercury (Hg2+) by hydrogen halides. For typicalcoal derived flue gases, HCl is the dominant hydrogen halide,thus mainly HgCl2 is formed. If HBr concentration of the flue gasis increased by the use of additives, HgBr2 concentration increasesaccordingly. The heterogeneous oxidation of Hg0 is catalyzed byhigh-dust SCR DeNOx systems, resulting in higher shares of HgCl2and/or HgBr2 [6].
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