Abstract
Coal-fired power plants are the main emission source of trace elements (TEs) due to the large consumption of coal. The transformation and emission of TEs are dependent on many factors, such as the generation of TEs in coal, their evaporation characteristics, flue gas components, oxidation/reduction atmosphere, condensation/adsorption between TE compounds, etc. Understanding the distribution and migration of TEs across the whole system comprehensively is a very important step to effectively reduce TE emissions from coal-fired power plants. In this chapter, the emission and migration characteristics of TEs across air pollution control devices are summarized. The roles of selective catalytic reduction, electrostatic precipitators, wet flue gas desulfurization, and wet electrostatic precipitators on the migration and emission of TEs are summarized systematically. The distribution of TEs in combustion products is also presented. Finally, the atmospheric emission factors of TEs at different power plants are compared.
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