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Heterogeneous oxidation of mercury in simulated post combustion conditions

机译:模拟后燃烧条件下汞的非均相氧化

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Heterogeneous mercury oxidation was studied by exposing whole fly ash samples and magnetic, nonmagnetic, and size-classified fly ash tractions to elemental mercury vapor in simulated flue gas streams. Fly ash from sub-bituminous Wyodak-Anderson PRB coal and bituminous Blacksville coal were used. Scanning electron microscopy, X-ray diffraction, thermogravimetric analyses, and BET N_2 isothermal sorption analyses were performed to characterize the fly ash samples. Mercury speciation downstream from the ash was determined using the Ontario Hydro method. Results showed that the presence of fly ash was critical for mercury oxidation, and the surface area of the ash appears to be an important parameter. However, for a given fly ash, there were generally no major differences in catalytic oxidation potential between different fly ash fractions. This includes fractions enriched in unburned carbon and iron oxides. The presence of NO_2, HC1, and SO_2 resulted in greater levels of mercury oxidation, while NO inhibited mercury oxidation. The gas matrix affected mercury oxidation more than the fly ash composition.
机译:通过将整个粉煤灰样品以及磁性,非磁性和尺寸分类的粉煤灰引物暴露于模拟烟气流中的元素汞蒸气中,研究了异质汞氧化。使用了来自次沥青Wyodak-Anderson PRB煤和沥青Blacksville煤的粉煤灰。进行了扫描电子显微镜,X射线衍射,热重分析和BET N_2等温吸附分析,以表征飞灰样品。使用安大略水电法确定了灰分下游的汞形态。结果表明,粉煤灰的存在对于汞氧化至关重要,并且粉煤灰的表面积似乎是重要的参数。但是,对于给定的粉煤灰,不同粉煤灰馏分之间的催化氧化电位通常没有重大差异。这包括富含未燃烧的碳和铁氧化物的馏分。 NO_2,HC1和SO_2的存在导致汞氧化水平更高,而NO抑制汞氧化。气体基质对汞氧化的影响大于粉煤灰的组成。

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