In order to understand adsorption effect of porous materials on PAHs generation during waste fluidized-bed incineration, comparison of porous and nonporous alumina bed materials for PAHs formation was experimentally investigated in a plastic waste fluidized-bed incinerator. Meanwhile, the distributions and contents of gaseous PAHs, particulate associated PAHs, PAHs precursors (monocyclic aromatic hydrocarbons and light hydrocarbon) in the dense region, freeboard region and outlet of the incinerator were also measured. The results indicated that ethylene (C₂H₄), ethyne (C₂H₂), propene (C₃H₆), benzene (C₆H₆), and styrene (C₈H₈) were the main precursors for PAHs formation. The 3-ring and 4-ring PAHs were dominant, and the particulate associated PAHs was the main components in flue gas. Meanwhile, the gaseous PAHs and particulate associated PAHs were respectively reduced by 49.20% and 39.41% when the non-porous alumina was replaced by the porous alumina bed materials. Based on the PAHs formation routes, the suppression mechanism for PAHs formation was proposed that the porous alumina adsorbed more PAHs precursors in the dense region due to its higher adsorption capacity, simulateously reduced the evolution rate of the PAHs precursors and prolonged the residence time of PAHs precursors in the freeboard region of the incinerator.

为了了解废料流化床焚烧过程中多孔材料对多环芳烃生成的吸附效果，在塑料废料流化床焚烧炉中通过实验研究了多孔和无孔氧化铝床材料对多环芳烃形成的影响。同时，还测量了焚烧炉密集区域，干舷区域和出口处的气态多环芳烃，颗粒状多环芳烃，多环芳烃前体（单环芳烃和轻烃）的分布和含量。结果表明，乙烯（C ₂ H ₄），乙炔（C ₂ H ₂），丙烯（C ₃ H ₆），苯（C ₆ H ₆）和苯乙烯（C₈ H ₈）是形成PAHs的主要前体。3环和4环PAH占主导地位，与颗粒物相关的PAH是烟气中的主要成分。同时，当用多孔氧化铝床材料代替无孔氧化铝时，气态PAH和颗粒缔合的PAH分别减少了49.20％和39.41％。根据多环芳烃的形成途径，提出了抑制多环芳烃形成的机理，即多孔氧化铝由于其较高的吸附能力，在致密区域吸附了更多的多环芳烃前体，从而明显降低了多环芳烃前体的析出速率，延长了多环芳烃的停留时间。焚烧炉干区的前驱物。