Bench-Scale Studies on Capture of Mercury on Mineral Non-Carbon Based Sorbents
A new high-temperature,mineral non-carbon based dispersed sorbent derived from paper recycling products has been shown to capture mercury at high temperatures in excess of 600℃.The sorbent is consisted of kaolinite/calcite/lime mixtures.Experiments have been conducted on chemisorption of elemental mercury in air on a packed bed.The sorption occurs at temperatures between 600°C and 1100℃ and requires activation of the minerals contained within the sorbents.Mercury capture is dominated by temperature and capture on sorbents over long time scales.The capture shows a maximum effectiveness at 1000℃ and increases monotonically with temperature.The presence of oxygen is also the required.Freshly activated sorbent is the most effective,and deactivation of sorbents occurs at high temperatures with long pre-exposure times.This activation is suspected to involve a solid-solid reaction between intimately mixed calcium oxide and silica that are both contained within the sorbent.Deactivation occurs at temperatures higher than 1000℃,and this is due to melting of the substrate and pore closure.The situation in packed beds is complicated because the bed also shrinks,thus allowing channeling and by-passing,and consequent ambiguities in determining sorbent saturation.Sorbent A had significantly greaiter capacity for mercury sorption than did Sorbent B,for all temperatures and exposure time examined.The effect of SiO2 on poor Sorbent B is much larger than sorbent A.
Mercury non-carbon based sorbents high temperature capture packed-bed
Yang Lla Jost O.L.Wendt Junying Zhang Chuguang Zheng
Department of Chemical Engineering,University of Utah,Salt Lake City,UT 84112,U.S.A State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,C
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
242-246
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）