| Transformation of mercury speciation through the SCR system in power plants |
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| 作者姓名： | YANG Hong-min PAN Wei-ping |
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| 作者单位： | [1]School of Power Engineering, Nanfing Normal University, Nanfing 210042, China [2]Institute for Combustion Science and Environmental Technology, Western Kentucky University, Bowling Green, KY, 42101, USA |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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教育部留学回国人员科研启动基金 |
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| 摘 要： | Coal-fired utility boilers are now identified as the largest source of mercury in the United States. There is speculation that the installation of selective catalytic reduction （SCR） system for reduction of NOx can also prompt the oxidation and removal of mercury. In this paper, tests at six full-scale power plants with similar type of the SCR systems are conducted to investigate the effect of the SCR on the transformation of mercury speciation. The results show that the SCR system can achieve more than 70%-80% oxidation of elemental mercury and enhance the mercury removal ability in these units. The oxidation of elemental mercury in the SCR system strongly depends on the coal properties and the operation conditions of the SCR systems. The content of chloride in the coal is the key factor for the oxidization process and the maximum oxidation of elemental mercury is found when chloride content changes from 400 to 600 ppm. The sulfur content is no significant impact on oxidation of elemental mercury.
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| 关 键 词： | 物种形成 汞元素 植物 环境保护 |
| 收稿时间： | 2006-03-10 |
| 修稿时间： | 2006-04-19 |
Transformation of mercury speciation through the SCR system in power plants |
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| YANG Hong-min,PAN Wei-ping.Transformation of mercury speciation through the SCR system in power plants[J].Journal of Environmental Sciences,2007,19(2):181-184. |
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| Authors: | YANG Hong-min and PAN Wei-ping |
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| Institution: | 1. School of Power Engineering, Nanjing Normal University, Nanjing 210042, China;Institute for Combustion Science and Environmental Technology, Western Kentucky University, Bowling Green, KY, 42101, USA
2. Institute for Combustion Science and Environmental Technology, Western Kentucky University, Bowling Green, KY, 42101, USA |
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| Abstract: | Coal-fired utility boilers are now identified as the largest source of mercury in the United States. There is speculation that the installation of selective catalytic reduction (SCR) system for reduction of NOx can also prompt the oxidation and removal of mercury.In this paper, tests at six full-scale power plants with similar type of the SCR systems are conducted to investigate the effect of the SCR on the transformation of mercury speciation. The results show that the SCR system can achieve more than 70%-80% oxidation of elemental mercury and enhance the mercury removal ability in these units. The oxidation of elemental mercury in the SCR system strongly depends on the coal properties and the operation conditions of the SCR systems. The content of chloride in the coal is the key factor for the oxidization process and the maximum oxidation of elemental mercury is found when chloride content changes from 400 to 600 ppm. The sulfur content is no significant impact on oxidation of elemental mercury. |
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| Keywords: | electric utility boiler selective catalytic reduction mercury speciation oxidation power plants systems mercury speciation sulfur content significant impact factor oxidization process maximum chloride changes coal properties operation conditions results show ability units |
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