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Co-Combustion of Dried Sewage Sludge and Coal - The Fate of Heavy Metals

机译：干燥污泥和煤的共燃烧 - 重金属的命运

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The fate of some selected heavy metals has been investigated during co-combustion of sewage sludge and coal in two fluidised bed combustors: the 12 MW{sub}(th) circulating fluidized bed (CFB) boiler at CTH and the laboratory scale unit at IVD. The total and species balances were, in general, fairly well closed, and the increased amounts of heavy metals originating from the input sludge were also found in the exit flows. Volatile species such as Hg and Cd are sensitive to the temperature conditions. Thus, almost no mercury was found in the bottom ash, and a cyclone at 350°C captured little Hg in comparison to a cyclone and filters at 150°C. The high particle loading in a CFB appears to contribute essentially to the reduction of the flue gas mercury concentration; the emission is reduced by orders of magnitude compared to a plant with low particle concentration. In most cases investigated the emissions of heavy metals were below the limits related to co-combustion set by the European Union.
机译：在两个流化床燃烧器中的污水污泥和煤的共同燃烧期间研究了一些选定的重金属的命运：CTH和IVD的实验室规模单位的12 MW {亚}（TH）循环流化床（CFB）锅炉。总体和物种平衡一般，闭合相当好，并且在出口流动中也发现了源自输入污泥的重金属的增加量。挥发性物种如Hg和Cd对温度条件敏感。因此，在底部灰分中几乎没有发现汞，与150℃的旋风分离器和过滤器相比，在350℃下捕获小Hg的旋风分离。 CFB中的高颗粒载荷似乎基本上有助于降低烟气汞浓度;与具有低颗粒浓度的植物相比，发射减少了数量级。在大多数情况下，调查了重金属的排放低于与欧盟设定的共同燃烧有关的限制。

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