Removal of Mercury Compounds from the Incinerator Flue Gas by a Pilot-scale Fixed Adsorption Bed

摘要

Adsorption experiments of mercury compounds by activated carbons have been performed using by-passed flue gas from a real waste incinerator. Using commercial grade sulfur-impregnated activated carbons, the removal efficiency of mercury compound was 97% at temperature of 80°C. It also was the same level at even higher temperature, for example, 140°C. Slight increase in sulfur dioxide (SO{sub}2) level was found at this high temperature, though. The mercury concentrations after the second stage was lower than 10μg/Nm{sup}3, which meets the German regulation limit on mercury in the incineration flue gas, 30μg /Nm{sup}3. The cumulative removal efficiency of the two stages (the first and the second) was as high as 95%. However, the mercury concentration cannot be lower than 10μg/Nm{sup}3 in this fixed-bed adsorption facility with additional stages, so the overall mercury removal efficiency of the pilot plant was limited to 97% maximum.