Mercury adsorption characteristics of HBr-modified fly ash in an entrained-flow reactor
Yongsheng Zhang
,
Lilin Zhao
,
Ruitao Guo
,
Na Song
,
Jiawei Wang
,
Yan Cao
,
William Orndorff
,
Wei-ping Pan
DOI:10.1016/j.jes.2015.01.011
Received September 14, 2014,Revised November 24, 2014, Accepted January 14, 2015, Available online April 29, 2015
Volume 27,2015,Pages 156-162
In this study, the mercury adsorption characteristics of HBr-modified fly ash in an entrained-flow reactor were investigated through thermal decomposition methods. The results show that the mercury adsorption performance of the HBr-modified fly ash was enhanced significantly. The mercury species adsorbed by unmodified fly ash were HgCl2, HgS and HgO. The mercury adsorbed by HBr-modified fly ash, in the entrained-flow reactor, existed in two forms, HgBr2 and HgO, and the HBr was the dominant factor promoting oxidation of elemental mercury in the entrained-flow reactor. In the current study, the concentration of HgBr2 and HgO in ash from the fine ash vessel was 4.6 times greater than for ash from the coarse ash vessel. The fine ash had better mercury adsorption performance than coarse ash, which is most likely due to the higher specific surface area and longer residence time.
