Bhardwaj Ravi, Chen Xihua, Vidic Radisav D
Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA, USA.
J Air Waste Manag Assoc. 2009 Nov;59(11):1331-8. doi: 10.3155/1047-3289.59.11.1331.
The impact of different fly ash samples on mercury speciation in simulated flue gas at 140 degrees C was evaluated in this study. Experiments were conducted in a fixed bed reactor to determine the impact of fly ash morphological characteristics and chemical composition on mercury uptake and oxidation. No homogeneous mercury oxidation was observed at 140 degrees C. Mercury uptake tests with different fly ash samples revealed that loss on ignition (LOI), surface area, and particle size all had positive effects on mercury oxidation and adsorption (i.e., as the above parameters increased, mercury adsorption and oxidation also increased). Experiments with pure inorganic components showed that alumina (A12O3), silica (SiO2), calcium oxide (CaO), magnesium oxide (MgO), and titania (TiO2) do not promote mercury oxidation or adsorption. Ferric oxide (Fe2O3) and unburned carbon, on the other hand, showed significant mercury oxidation and capture.
本研究评估了不同粉煤灰样品对140℃模拟烟气中汞形态的影响。在固定床反应器中进行实验，以确定粉煤灰形态特征和化学成分对汞吸收与氧化的影响。在140℃未观察到均相汞氧化。对不同粉煤灰样品进行的汞吸收测试表明，烧失量（LOI）、表面积和粒径对汞氧化和吸附均有积极影响（即随着上述参数增加，汞吸附和氧化也增加）。纯无机成分实验表明，氧化铝（Al₂O₃）、二氧化硅（SiO₂）、氧化钙（CaO）、氧化镁（MgO）和二氧化钛（TiO₂）不会促进汞氧化或吸附。另一方面，氧化铁（Fe₂O₃）和未燃尽碳表现出显著的汞氧化和捕获作用。
