The low-low temperature electrostatic precipitator (LLT-ESP) is one of the most used devices for pollutant control in ultra-low emission coal-fired power plants. This study investigated the influence of the LLT-ESP on polycyclic aromatic hydrocarbons (PAHs) distributions in flue gas from an ultra-low emission coal-fired power plant. The total gas-phase PAH concentration was reduced from 27.52 μg/m³ to 3.38 μg/m³. The total particulate-phase PAH concentration decreased from 14.36 μg/m³ to 0.34 μg/m³. The removal efficiency of the LLT-ESP for gas-phase and particulate phase carcinogenic higher molecular weight (HMW) PAHs was 85% and 99%, respectively. The total concentration of 16 selected PAHs in feed coal was 98.16 μg/g. The fly ash particle size successively decreased from Electric Field 1 (F1) to Electric Field 4 (F4). The total PAH concentration decreased from F1 to F2 but increased again from F3 to F4. The flue gas cooling process significantly contributed to the elimination of both gas- and particulate-phase PAHs in the flue gas. Presumably, most of the condensed PAHs were adhered to or absorbed in the fly ash and were scavenged in Field 1. Both gas- and particulate-phase 5- and 6-ring PAHs in the flue gas were completely removed in Field 1. The discharge process in the electric fields may promote the formation of several 4- or 5-ring PAHs. In this study, benzo[k]fluoranthene (BKF) and benzo[a]pyrene (BaP) were regenerated in the particles rather than in the flue gas during the discharge process in the electric fields.

低温静电除尘器（LLT-ESP）是超低排放燃煤电厂中最常用的污染物控制设备之一。这项研究调查了LLT-ESP对超低排放燃煤电厂烟气中多环芳烃（PAHs）分布的影响。总气相PAH浓度从27.52μg/ m ³降低至3.38μg / m ³。总颗粒相PAH浓度从14.36μg/ m ³降至0.34μg/ m ³。LLT-ESP对气相和颗粒相致癌高分子量（HMW）PAH的去除效率分别为85％和99％。进料煤中16种选定的PAHs的总浓度为98.16μg/ g。飞灰颗粒尺寸从电场1（F1）逐渐减小到电场4（F4）。总PAH浓度从F1降低到F2，但又从F3升高到F4。烟道气的冷却过程对消除烟道气中的气相和颗粒态PAHs起到了重要作用。据推测，大多数冷凝的PAHs粘附或吸附在粉煤灰中，并在场1中被清除。在场1中，烟气中的气相和气态五环和六环PAHs都被完全去除。电场中的放电过程可能会促进几个4或5环PAH的形成。在这项研究中，在电场放电过程中，苯并[k]荧蒽（BKF）和苯并[a] py（BaP）在颗粒中而不是在烟道气中再生。