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.

中文翻译：

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影响可凝性颗粒物质中多环芳烃分布特征的因素研究

可冷凝颗粒物（PM）极大地促进了固定来源颗粒物的总排放量。研究了燃煤电厂中可冷凝颗粒物中多环芳烃（PAHs）的分布特征。分析了燃煤和湿式静电除尘器（WESP）的硫含量对可冷凝PM中PAH分布的影响。在冷凝PM多环芳烃的总质量浓度相当低（1.05微克/米³在阶段1中，0.69微克/米³在第2阶段，和1.89微克/米³在第3阶段）。3环和4环PAH是可冷凝PM中的主要PAH化合物。与较低的硫含量相比，燃烧的煤中较高的硫含量导致较高的PAH含量和可冷凝PM中的排放量。硫含量可以促进煤燃烧过程中多环芳烃的形成。WESP在可冷凝PM中的总PAH排放具有良好的去除效率（约63％）。WESP可以明显降低可冷凝PM中PAH的总毒性当量（TEQ）值。在本研究中，可冷凝PM中PAH的总TEQ主要由3环和5环PAH贡献。