Analysis on Mercury Emission and Control Technology of Typical Industries in China

摘要

The mercury emission characteristics of coal-fired power plant boilers, industrial boilers, cement kilns, and sintering of iron and steel industry were studied in this paper. The reducing effect of mercury emissions by pollution control technology was analyzed. The EPA standard method was used to measure the mercury concentration of the pollution sources. For coal-fired boilers, the mercury removal efficiency of the existing electrostatic precipitator and wet FGD is up to 60%-70%, and the mercury concentration in the flue gas is below the standard 30μg/Nm~3. The main mercury emissions of cement industries are at the kiln outlet, the mercury concentration of which is 2.5 to 5.4 times that of the kiln inlet. For the iron and steel industry, the mercury concentration of the exhausting gas after dust removal and desulfurization can not meet the emission limits and need to be further controlled. The research did in the paper made a scientific basis for the improvement of atmospheric mercury emission inventory and the mercury control.