In order to further reduce the emission mass concentration of pollutants from flue gas of existing coalfired units and realize coordinated and deep treatment of air pollutants

the active selective catalytic reduction(SCR)catalyst was selected as the research object

and the influence mechanism of halogen components such as HCl/HBr on the denitration synergistic mercury oxidation performance of the SCR catalyst under different conditions was systematically studied. Moreover

the halogen solution injection system was designed. According to the research result in laboratory

the engineering application and test using NH_4Cl/NH_4Br solution injection were carried out in the field denitration process. The results show that

reasonable addition of NH_4Cl or NH_4Br solution during the denitration process can effectively improve the mercury oxidation capacity of the existing catalyst. The combined action of HCl/HBr can improve the oxidation effect of single HCl on elemental mercury on the catalyst surface.Furthermore

through the denitration

downstream desulfurization

dust removal and other environmental protection facilities

efficient synergistic removal of mercury pollutants can be realized.