Abstract
The influence of steam and minerals on Cr transformation during oxy-coal combustion has been examined in a drop tube furnace at 1273 K. An extra 500 ppmv HCl and 1000 ppmv SO2 were also added to flue gas to examine the competition of H2O, HCl, and SO2 on Cr behaviors during oxy-coal combustion upon the recirculation of impurities in flue gas. It was found that CaO and Fe2O3 exhibited high capability on capturing Cr-bearing vapors during combustion compared to limestone and kaolin. Changing air to oxy-coal combustion obviously weakened the role of CaO, whereas it promoted reaction between Fe2O3 and Cr vapors. The existence of H2O in flue gas facilitated the oxidation of trivalent Cr(III) to high valence Cr vapors in a short second time scale. CaO, particularly in the coexistence of H2O during coal combustion, remarkably enhanced the toxic Cr(VI) fraction in solid ash. H2O affected the behavior of minerals reacted with Cr. CaO was inhibited and Fe2O3 was enhanced by steam to react with Cr during oxy-coal co...
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