Abstract：16US EPA priority PAHs at the inlet and outlet of fabric filter in a circulating fluidized bed boiler of CFPPs were analyzed. The partitioning mechanism of PAHs in the gas- and particle-phases with different particle sizes was studied. The results showed that the removal rates of gas phase and particulate PAHs by the fabric filter were 45.6% and 70.7%~89.1%, respectively. The gas phase mainly contained low molecular weight PAHs, while medium and high molecular weight PAHs were predominant in particle phases. The fractions of low molecular weight PAHs showed a declining trend with the decrease of particle size. The gas-particle partitioning of PAHs was primarily controlled by organic carbon absorption, and it had an apparent dependence on particle sizes. Most of PAHs species in the particles of different particle sizes in flue gas exhibited bi-model structures, with one mode peaking in the accumulation size range (1.1~2.1μm) and another peaking in the coarse size range (4.7~5.8μm). The emission factor of PAHs was 3.55mg/kg of coal burned, with 0.55mg/kg in gas phase and 3.0mg/kg in particle phase, respectively. Emissions of PAHs increased gradually from 29000kg in 2010 to 34200kg in 2014, then remained constant from 2014 to 2016, and finally significantly increased to 35900kg in 2017.
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NI Xiu-feng, WANG Ru-wei, WANG Ji-zhong, HUANG Qing, CAI Fei-xuan. Studies on the gas-particle partitioning mechanism of polycyclic aromatic hydrocarbons (PAHs) and emission amount from coal-fired power plants. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 49-55.
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