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

ABSTRACT

The 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).

KEYWORDS:

• Coal
• equilibrium
• thermodynamic calculations
• trace elements
• oxy-fuel combustion

Funding

This work was carried out with financial support from the AGH University of Science and Technology (D.S. no. 11.11.110.294)

Additional information

Funding

This work was carried out with financial support from the AGH University of Science and Technology (D.S. no. 11.11.110.294)