Removal of Vapor-Phase Elemental Mercury by Oil-Fired Fly Ashes
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- 作者：Jeom-In Baek ; Ji-Ho Yoon ; Si-Hyun Lee ; Chong Kul Ryu
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2007
- 出版时间：February 14, 2007
- 年：2007
- 卷：46
- 期：4
- 页码：1390 - 1395
- 全文大小：248K
- 年卷期：v.46,no.4(February 14, 2007)
- ISSN：1520-5045
文摘
The vapor-phase elemental mercury removal efficiency of the heavy-oil-fired fly ash (HOFA) dischargedfrom heavy-oil-fired power plants was first tested to evaluate its suitability as a base material for thedevelopment of a low-cost novel sorbent to capture vapor-phase mercury in coal combustion flue gases.Raw, CO2-activated, and sulfur-impregnated HOFAs were prepared and tested. The morphology, specificsurface area, particle size, and chemical composition were analyzed for the tested samples. A bench-scalefixed-bed reactor system was used to determine the mercury removal efficiencies of the HOFAs andcommercially available activated carbons for comparison. The CO2-activated HOFA showed slightly highermercury removal efficiency than the raw HOFA, resulting from the increase of active sorption sites by theenlarged surface area. The mercury removal efficiencies of the HOFAs modified by the sulfur impregnationprocess significantly increased with increasing sulfur content and were comparable to those of the commerciallyavailable sulfur-impregnated activated carbons, despite their much smaller surface area. These results suggestthat the sulfur sites formed on the surface of the HOFAs during the impregnation process are highly activein capturing vapor-phase elemental mercury.