Study on simultaneous removal of SO2 and Hg in wet flue gas desulfurization
湿式烟气脱硫系统同时脱汞研究

It was indicated that wet flue gas desulfurization (WFGD) system could remove a high percentage of mercury (II) from the flue gas but was ineffective at removing Hg0. So it is significant to study the method of increasing mercury oxidation rate to remove total mercury in WFGD. An overview of the mercury removal effectives of several additives in WFGD was presented. In these additives, ozone, chloric acid and sodium chlorate(NOXSORBTM) dilute solution, yellow phosphorus emulsion, sodium bisulfide solution and ethylenediaminetetracetic acid (EDTA) which would not be consumed largely by SO2 were believed to have certain effects. Thus, simultaneous removal of mercury and SO2 in WFGD system could be achieved. Additives such as Cl2, and potassium persulfate solution (K2S2O8) also had certain effects but they were easily consumed by SO2 and sulfite solution, the scrubbing tower should be modified while these additives were used to oxidize the Hg0 in WFGD in order to reduce the capital and operation cost.