文档介绍：1 Experimental study on the absorption behaviors ofgas phase bivalent mercury in Ca-based wet flue gas desulfurization slurry system Abstract: Gas phase oxidation and catalytic oxidation of element mercury (Hg 0) to bivalent mercury (Hg 2+ )were proposed to improve the mercury removal efficiency in the wet flue gas desulfurization (WFGD) system. However, the re-emission of Hg 0, generated by the reduction of absorbed Hg 2+, would lead to a damping of the total mercury removal efficiency. In this paper, the absorption and reduction behaviors of bivalent mercury in the Ca-based WFGD slurry were evaluated inour purpose-built device. According toour experimental results, the slurry chemistry (such as CaSO 3 content, SO 4 2?, Cl ? and pH value) had a strong influence on the reduction of absorbed bivalent mercury. And the inlet concentrations of SO 2 and O 2 contribute little to the mercury absorption. Within the typical pH value range –, about 70% of inlet bivalent mercury was converted to Hg 0. The re-emission of Hg would be greatly retarded with the increase of [SO 4 2?]due to the formation of HgSO 4or Hg 3O 2 SO 4. Moreover, it was found that Cl ? would also inhibit the reduction of bivalent mercury through the ligands reactions between Cl ? and Hg 2+. 1. Introduction Mercury, due to its persistence, bio-accumulation and neurological toxicity, had received considerable attention from environmental engineers and environmental protecting institutions [1]. According to the conservative estimation of Environmental Protection Agency (EPA), the exposure reference dose μg (mercury)/kg (body weight)/day was justified to protect against harmful neurological effects during fetal development and early childhood [2]. bustion was considered as the largest source of anthropogenic 2 mercury emission. Mercury existed in the flue gas mainly in three forms: element mercury (Hg0), oxidized mercury (Hg 2+) and particle-bound mercury (Hg (P)) [3]. In bustion zone, the mercu