Mechanisms governing the fate of mercury in coal-fired power systems

被引：63

作者：

Gale, Thomas K. ^{[1
]}

Lani, Bruce W. ^{[2
]}

Offen, George R. ^{[3
]}

机构：

[1] So Res Inst, Birmingham, AL 35205 USA

[2] US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA

[3] Elect Power Res Inst, Palo Alto, CA 94304 USA

来源：

FUEL PROCESSING TECHNOLOGY | 2008年 / 89卷 / 02期

关键词：

mercury speciation; coal combustion; flyash; calcium;

D O I：

10.1016/j.fuproc.2007.08.004

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

This paper summarizes the results of a significant research and development investment to understand the fundamental mechanisms governing the speciation of mercury in coal-fired power systems. An extensive experimental search was conducted through all the parameter variations characterizing the majority of full-scale U.S. coal-fired power plants, in an effort to quantify the impact each parameter variation had on mercury oxidation and removal from the gas phase. As a result of this extensive investigation, the mechanisms responsible for mercury speciation differences observed for different coal types, power plants, and pollution control devices were elucidated. Specifically, unburned carbon was found to catalytically enhance mercury oxidation, while the actual differences in chlorine concentration from plant to plant were found to be of secondary importance to carbon. in addition, synergistic enhancement of mercury capture by carbon and calcium in flyash was quantitatively described for various coal-fired configurations, such as coal blending and sorbent injection, including development of contour plots of mercury removal at an ESP inlet and exit as a function of carbon and calcium concentration at the ESP inlet. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：139 / 151

页数：13

共 13 条

[1]

BEHRENS G, 2000, 1000608 EPRI

[2]

CHEN Z, 2002, 27 ANN TECHN C COAL

[3]

FIGLIOLA RS, 1995, THEORY DESIGN MECH M, P180

[4] EFFECTS OF PYROLYSIS CONDITIONS ON INTERNAL SURFACE-AREAS AND DENSITIES OF COAL CHARS PREPARED AT HIGH HEATING RATES IN REACTIVE AND NONREACTIVE ATMOSPHERES [J].