Assess of biomass co-firing under oxy-fuel conditions on Hg speciation and ash deposit formation

Hg speciation was seen to be more affected by oxy-fuel combustion during the co-firing tests than in coal combustion, with an increment in Hg oxidation at low temperatures (T < 350 °C) and mainly for oxygen concentrations over 30% v/v. This effect is highly related to variations produced in chlorine speciation in the oxy-fuel atmospheres, in which ash deposition and corrosion modifications were seen to be also involved, with a reduction of the chlorinated species against an increased in the sulphated compounds concentration.