Equilibrium calculations of As, Pb, and Hg speciations during coal combustion in atmospheres 21O2/79N2 and 30O2/70CO2

Abstract

ABSTRACTThe research of this paper investigated the influence of a coal combustion atmosphere, pressure, and temperature on the equilibrium speciation of As, Pb, and Hg. The input data for calculations in the FactSage were the results of coal from the mine “Bogdanka”. A change in the combustion atmosphere from air to 30%O2/70%CO2 results in an increase in the mole fractions of As, Pb, and Hg species that occur in the gaseous phase, i.e. AsO, AsO2, PbO, PbCl2, HgCl2, and Hg. At temperatures below 900°C, almost all arsenic moves to solid species in the form of salts derived from arsenic acid (V).