Study on the Influencing Factors of the Distribution Characteristics of Polycyclic Aromatic Hydrocarbons in Condensable Particulate Matter
2017
Li, Jingwei | Li, Xiaodong | Zhou, Chenyang | Li, Min | Lu, Shengyong | Yan, Jianhua | Qi, Zhifu
Condensable particulate matter (PM) contributes significantly to the total emissions of particulate matter from stationary sources. The distribution characteristics of polycyclic aromatic hydrocarbons (PAHs) in condensable PM from a coal-fired power plant were investigated. The influence of the sulfur content of the burning coal and the wet electrostatic precipitator (WESP) on the PAH distributions in condensable PM was analyzed. The total mass concentrations of PAHs in condensable PM were quite low (1.05 μg/m³ in stage 1, 0.69 μg/m³ in stage 2, and 1.89 μg/m³ in stage 3). 3-ring and 4-ring PAHs were the major PAH compounds in condensable PM. The higher sulfur content in the burning coal led to greater PAH contents and emissions in condensable PM than the lower sulfur content. The sulfur content could promote the formation of PAHs during the coal combustion process. The WESP had good removal efficiency (approximately 63%) of total PAH emissions in condensable PM. The WESP could obviously decrease the total toxic equivalent (TEQ) values of PAHs in condensable PM. The total TEQs of PAHs in condensable PM were mostly contributed by the 3-ring and 5-ring PAHs in this study.
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