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The application of forced mercury oxidation technology would lead to an increase of Hg 2+  concentration in the flue gas. Although Hg 2+  can be easily removed in the WFGD, the mercury re-emission in the WFGD can decrease the total removal of mercury from coal-fired power plants. Hence, it is necessary to control Hg 2+  concentration in the devices before the WFGD. Fly ash adsorbent is considered as a potential alternative for commercial activated carbon adsorbent. However, the adsorption efficiency of the original fly ash is low. Modification procedure is needed to enhance the adsorption performance. In this study, the adsorption of Hg 2+  by brominated fly ash was studied. The fly ash was collected from the full-scale power plant utilizing bromide-blended coal combustion technology. The brominated fly ash exhibited excellent performance for Hg 2+  removal. The flue gas component HBr and SO 2  could improve adsorbent’s performance, while HCl would hinder its adsorption process. Also, it was demonstrated by Hg-TPD experiments that the adsorbed Hg 2+  mainly existed on the fly ash surface in the form of HgBr 2 . In summary, the brominated fly ash has a broad application prospect for mercury control.

An Experimental Study on Oxidized Mercury Adsorption by Bromide Blended Coal Combustion Fly Ash