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Catalytic oxidation of the organic pollutants present in the incineration flue gas by the fluidized palladium catallyst
Chung, Huang Hsin
fluidized catalyst bed
Incineration is considered to be an effective method to disposing waste, but the emissions of organic compounds in the flue gas have received major attention recently. They are harmful to the environment and human health when they are emitted into the atmosphere. Catalytic incineration has widely applied to destruct VOCs. It can be operated at lower temperature than flame combustion and required less extra fuel and decreases the forming of thermal NOx. Most studies were carried out with simulated VOCs gases and applied in conventional industrial process. This is different from the complicated secondary contaminants produced from incineration, such as heavy metals, acid gas, and fly ash, They could poison the catalyst and inhibite the oxidation of organics. The catalytic incineration of VOCs can be carried out in fixed and fluidized catalyst beds. Most of them were performed in fixed bed, the catalytic incineration in a fluidized bed were seldom investigated. The fluidized catalyst bed has the advantages of uniform bed temperature, high contact area, and high mass transfer efficiency, it also removal fine particulates simultaneously. Therefore, the objective of this work was to investigate the catalytic destruction removal efficiency of BTEX and PAHs generated from the incineration in a fluidized palladium catalyst. The parameters evaluated include (1) various fluidized velocity (Uf/Umf =1.5, 2.0, 2.5), (2) the effect of heavy metals (Pb, Cr, Cd), (3) the effect of acid gas (SOx and HCl), and (4) the effect of water vapor. Besides, the mass and elemental size distribution of heavy metals prior to and after flowing through the fluidized catalyst bed were also investigated. The results indicated that it had higher removal destruction remocal of BTEX and PAHs when the fluidized velocity was controlled at Uf/Umf =1.5. When the feedstock contained heavy metals, the presence of Pb and Cd inhibited deep the oxidation of organic compounds, but Cr did not. When the feedstock contained sulfur and PVC(chlorine), they could poison and deactivate the palladium catalyst. The presence of water vapor also decreased the DRE of BTEX and PAHs. The metal concentration of Pb, Cr, Cd are higher in the finer particles after flowing through the fluidized catalyst bed.
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