| Summary: | 碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程所 === 94 === Abstract
Adsorbent injection has been referred to as one of the best available control technology for removal of low-concentration mercury vapor from flue gases. The effectiveness of adsorption of mercury with adsorbents, however, is markedly influenced by acid and oxidizing components in flue gas streams. The main objective of this study is to evaluate the effects of O2, HCl, SO2, and NO on the adsorption of Hg0 with sulfur-impregnated activated carbon in a simulated coal-combustion environment.
Results showed that adsorptive kinetics and capacities of sulfur-impregnated activated carbon were enhanced when only one acid and oxidizing component coexisted with the CO2, H2O, and N2 (called “Baseline”). The effectiveness of increasing Hg0 adsorption capacities in declining order, was NO, HCl, O2, and SO2. Sulfur-impregnated activated carbon had greater Hg0 adsorptive kinetics and capacities in the testing environment containing two acid and oxidizing components, especially when NO existed; when O2 and SO2 coexisted, the sample had the smallest Hg0 adsorption capacity. When the testing environment contained at least three acid and oxidizing components, the Baseline/O2/SO2/NO environment resulted in the largest Hg0 adsorption capacity of sulfur-impregnated carbon, followed by the Baseline/O2/HCl/SO2/NO and Baseline/O2/HCl/NO environments. To summarize the obtained results, when acid and oxidizing components existed, SO2 decreased the Hg0 adsorption capacity. When NO did not exist, O2 and HCl increased the Hg0 adsorption capacity. When NO existed, HCl decreased the Hg0 adsorption capacity. Results from full factorial analysis also indicated that NO had a significant effect on the Hg0 adsorption capacity (P<0.05), but the effect of O2, HCl, and SO2 was less significant (P>0.05), suggesting that NO was the dominant gas component influencing the Hg0 adsorption with sulfur-impregnated activated carbon.
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