Abstract
AbstractExperimental studies on heavy metals captured by solid sorbents were carried out in a downflow reactor. The effects of various sorbents on heavy metal emissions under different combustion conditions were investigated. The operating parameters evaluated included: (1) different ratios of sorbent/coal (2%, 4% and 6%); (2) elevated temperatures (950 d̀C, 1100d̀C and 1250d̀C); (3) un‐staged and staged combustion. The experimental results indicated that the best metal capture efficiency occurs when the ratio of bauxite/coal is 2%, and 4% for both limestone/coal and calcium sulfate/coal systems. It was found that increasing temperature has a negative effect on heavy metal capture by sorbents. The experimental results also showed that the staged combustion has no effect on heavy metal removal, although it is effective in the control of NOx emissions. The leaching tests indicated that the mechanisms of heavy metal capture by solid sorbents include both physical adsorption and chemical reaction.
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