Incineration of doped sludges in fluidized bed. Fate and partitioning of six targeted heavy metals. I. Pilot plant used and results
Incineration of doped sludges in fluidized bed. Fate and partitioning of six targeted heavy metals. I. Pilot plant used and results
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DOI：
10.1016/s0304-3894(00)00280-6
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发表时间：
2000-12-30
影响因子：
13.6
通讯作者：
Toledo, JM
中科院分区：
文献类型：
--
作者：
Corella, J;Toledo, JM
在小型中试工厂内径 15 厘米的鼓泡流化床中研究了掺有几种重金属的污水污泥的焚烧。和5.2m的高度。一些陶瓷和金属过滤器在相对较高的温度（600-700℃）下进行了测试，以检查它们在分离色调气体中的重金属方面的有效性。这项工作的重点是六种选定的重金属（Cr、Cd、Ni、Zn、Cu、Pb）的归宿。在此过程中，这些金属有四种出口流量或排放：底灰、粗粉煤灰、滤饼或细粉煤灰和烟道出口气体。研究了每种重金属（HM）在这四种出口方式中的分布或分配。在所考虑的不同重金属之间，只有镉（有时是铅）显示出任何差异。所有其他 HM 似乎都有相同的命运、分布或划分。这种分布由焚烧炉、旋风分离器和陶瓷过滤器中的流体动力学控制或决定。大多数重金属在这种焚烧炉类型中没有足够的停留时间来扩散出灰颗粒，因此保留在颗粒中。在这个过程中，每个出口中每个重金属的量是由流体动力学和动力学决定的，而不是由热力学决定的。 (C) 2000 Elsevier Science B.V. 保留所有权利。
Incineration of sewage sludge doped with several heavy metals was studied at small pilot plant scale in a bubbling fluidized bed of 15 cm i.d. and 5.2m height. Some ceramic and metallic filters were tested at a relatively high temperature (600-700 degreesC) to check their usefulness for partitioning of heavy metals in the hue gas. The work was focused on the fate of six selected heavy metals (Cr, Cd, Ni, Zn, Cu, Pb). In this process, there were four exit flows or discharges for these metals: bottom ash, coarse fly ash, cake filter or fine fly ash and flue exit gas. The distribution or partitioning of each heavy metal (HM) among these four exit hows was studied. Only cadmium and sometimes lead showed any difference between the different HMs considered. All other HMs seems to have the same fate, distribution or partitioning. Such distribution is governed or ruled by the fluid dynamics in the incinerator, cyclone and ceramic filter. Most of the HMs do not have enough residence time in this incinerator type to diffuse out of the ash particle and so remain in the particle. The amount of each HM in each exit how in this process is governed by fluid dynamics and kinetics and not at all by thermodynamics. (C) 2000 Elsevier Science B.V. All rights reserved.