Low concentration mercury sorption mechanisms and control by calcium-based sorbents: Application in coal-fired processes

被引:71
作者
Ghorishi, SB [1 ]
机构
[1] ARCADIS Geraghty & Miller, Res Triangle Pk, NC 27709 USA
[2] US EPA, Natl Risk Management Res Lab, Air Pollut Prevent & Control Div, Res Triangle Pk, NC USA
来源
JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION | 1998年 / 48卷 / 12期
关键词
D O I
10.1080/10473289.1998.10463752
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The capture of elemental mercury (Hg-0) and mercuric chloride (HgCl2) by three types of calcium (Ca)-based sorbents was examined in this bench-scale study under conditions prevalent in coal-fired utilities. Ca-based sorbent performances were compared with that of an activated carbon. Hg-0 capture of about 40%(nearly half that of the activated carbon) was achieved by two of the Ca-based sorbents. The presence of sulfur dioxide (SO2) in the simulated coal combustion flue gas enhanced the Hg-0 capture from about 10 to 40%. Increasing the temperature in the range of 65-100 degrees C also caused an increase in the Hg-0 capture by the two Ca-based sorbents. Mercuric chloride (HgCl2) capture exhibited a totally different pattern. The presence of SO2 inhibited the HgCl2 capture by Ca-based sorbents from about 25 to less than 10%. Increasing the temperature in the studied range also caused a decrease in HgCl2 capture. Upon further pilot-scale confirmations, the results obtained in this bench-scale study can be used to design and manufacture more cost-effective mercury sorbents to replace conventional sorbents already in use in mercury control.
引用
收藏
页码:1191 / 1198
页数:8
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