Reduction of Polycyclic Aromatic Hydrocarbon Emission by Porous Alumina Bed Material during Sewage Sludge Incineration
Reduction of Polycyclic Aromatic Hydrocarbon Emission by Porous Alumina Bed Material during Sewage Sludge Incineration
复制标题
多孔氧化铝床料减少污泥焚烧过程中多环芳烃的排放
DOI：
10.1021/acs.energyfuels.5b01942
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发表时间：
2016-01-01
期刊：
影响因子：
5.3
通讯作者：
Kim, Heejoon
中科院分区：
文献类型：
--
作者：
Qin, Linbo;Han, Jun;Kim, Heejoon
在本文中，多孔氧化铝被用作替代床材料，以减少多环芳烃（PAH）发射，并提高流化床燃烧器（FBC）污水污泥燃烧期间的燃烧效率。为了发现还原机制，表征了三种床材料（硅粉，氧化铝砂和多孔氧化铝砂）的毛毛 - 贝特泰勒（BET）表面积，临界流动性速度和热转移系数。与常规的二氧化硅床材料相比，多孔氧化铝床材料在850摄氏度下的降低效率分别为52.0摄氏度，分别为52.0摄氏度和97.7％。多孔氧化铝床材料的BET表面积比常规二氧化硅砂的表面积更高，该二氧化硅砂可能会吸附气态的碳氢化合物并延长FBC稀释区中碳氢化合物的停留时间。同时，众所周知，气态烃是PAH的先驱。因此，PAH的形成被抑制了。此外，低热量转移系数将降低床材料和污水污泥之间的热传输速率，这导致多孔铝床材料中的污水污泥分解速率低于硅胶床材料的污水污泥。因此，形成了较少的气态碳氢化合物和PAH。此外，氧化铝床材料可能会抑制聚集并提高流化床焚化炉的流化质量。上述机制可能解释了多孔氧化铝床材料减少PAH的形成。
In this paper, porous alumina was used as an alternative bed material to reduce polycyclic aromatic hydrocarbon (PAH) emission and improve the combustion efficiency during sewage sludge combustion in a fluidized bed combustor (FBC). To discover the reduction mechanism, the Brunauer–Emmett–Teller (BET) surface area, critical fluidized velocity, and heat-transfer coefficient of three bed materials (silica sand, alumina sand, and porous alumina sand) were characterized. In comparison to the conventional silica bed material, the reduction efficiencies of PAH emission and PAH total toxic equivalent (TEQ) by porous alumina bed material under 850 °C were 52.0 and 97.7%, respectively. Porous alumina bed material had more BET surface area than that of the conventional silica sand, which could adsorb gaseous hydrocarbon and prolong the residence time of hydrocarbon in the diluted zone of the FBC. At the same time, it was well-known that gaseous hydrocarbons were a precursor of PAHs. Thus, PAH formation was suppress...