| abstract |
The present invention is a removal system for mercury in the flue gas configured to remove Hg contained in a flue gas flowing from a boiler, and includes: a heat exchanger configured to execute heat exchange for a flue gas flowing from a boiler; a precipitator configured to remove soot dust in the flue gas; a wet SOx removal unit configured to remove mercury oxide Hg 2 + in the flue gas by alkali absorbent and desulfurize sulfur oxide in the flue gas; and an HBr compound supply unit configured to supply HBr, namely, a Br compound into a flue gas duct configured to discharge a flue gas from a boiler outlet. Further, enrichment of bromine contained in the alkali absorbent inside the wet SOx removal unit is set to predetermined enrichment or higher. |