In-Situ Capture of Mercury in Coal-Fired Power Plants Using High Surface Energy Fly Ash

被引：76

作者：

Zhang, Yongsheng ^{[1
]}

Mei, Dongqian ^{[1
]}

Wang, Tao ^{[1
]}

Wang, Jiawei ^{[1
]}

Gu, Yongzheng ^{[1
]}

Zhang, Zailei ^{[2
]}

Romero, Carlos E. ^{[3
]}

Pan, Wei-ping ^{[1
]}

机构：

[1] North China Elect Power Univ, Minist Educ, Key Lab Condit Monitoring & Control Power Plant E, Beijing 102206, Peoples R China

[2] Chinese Acad Sci, Beijing Inst Nanoenergy & Nanosyst, CAS Ctr Excellence Nanosci, Beijing 100083, Peoples R China

[3] Lehigh Univ, Energy Res Ctr, 117 ATLSS Dr, Bethlehem, PA 18015 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2019年 / 53卷 / 13期

基金：

中国国家自然科学基金;

关键词：

ELEMENTAL MERCURY; REMOVAL; COMBUSTION; CARBON; GAS;

D O I：

10.1021/acs.est.9b01725

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Coal-fired power plants represent the largest source of mercury emissions worldwide. Using fly ash, a byproduct of these plants, as a sorbent to remove mercury has proven to be difficult. Here, we found that the fresh surface of modified fly ash has good adsorption performance, and it declines obviously with time because of unsaturation characteristics on surface. On the basis of this mechanism, our study provides a method to in situ capture mercury with high surface energy modified fly ash by mechanochemical and bromide treatment. Fresh modified fly ash with active sites is injected into the flue to directly adsorb mercury. A continuous system within a full-scale 300 MWe plant showed that the mercury adsorption performance of the modified fly ash is similar to that of activated carbon, which is the industry benchmark for the treatment of mercury emission in fossil power generation units. This is a breakthrough and indicates that modified fly ash can become an efficient and convenient industrial sorbent for the removal of mercury.

引用

页码：7913 / 7920

页数：8

共 27 条

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