• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of energy research >Emission of trace toxic metals during pulverized fuel combustion of Czech coals
【24h】

Emission of trace toxic metals during pulverized fuel combustion of Czech coals

机译：捷克煤粉燃料燃烧过程中的微量有毒金属排放

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A study of the trace elements emission (As. Se, Cd, Co, Cr, Cu. Zn, Hg. Tl, Pb, Ni, Sn, Sb. V. Mn and Fe) from pulverized coal combustion has been made at six heating and power stations situated in the Czech Republic. The amount of chlorine in coal has considerable influence on volatilization of some elements such as Zn, Cu, Pb. Hg and Tl, which is explained by the formation of thermodynamically stable compounds of these elements with chlorine. Generally, the affinities for Cl follows the order Tl > Cu > Zn> Pb > Co > Mn > Sn > Hg. The experimental data indicates enrichment of some of the trace toxic elements in the emissions (Cu, Zn, As, Se, Cd. Sn, Sb, Hg and Pb) and good agreement was obtained by thermodynamic equilibrium calculations with a few exceptions. In the case of Fe, Mn, Co, Cr and Sn calculated values are overestimated in the bottom ash and there are zero predicted amounts of these elements in the fly ash. In comparison, the results from experiments show up to 80 percent of these elements retained in fly ash. This implies that there exist additional steps leading to the enrichment by Fe, Mn, Co. Cr and Sn of small particles. Such mechanisms could include the ejection during devolatilization of small inorganic particles from the coal of bottom ash particles, or disintegration of the char containing these metals to small particles of fly ash. On the other hand, there are slightly overestimated or similar values of relative enrichment factors for As, V, Cu, Cd, Sb, Tl and Pb in the fly ashes and zero predicted values for bottom ashes. Our experimental results show about 5 percent or less of these elements are retained in bottom ashes, so they probably remain in the bottom ash inside unburned parts of coal.
机译：在六次加热条件下，研究了粉煤燃烧过程中微量元素的排放（例如，Se，Cd，Co，Cr，Cu，Zn，Hg。Tl，Pb，Ni，Sn，Sb.V。Mn和Fe）的排放。和位于捷克共和国的电站。煤中的氯含量对某些元素（如Zn，Cu，Pb）的挥发有很大影响。 Hg和Tl，可通过与氯形成这些元素的热力学稳定化合物来解释。通常，Cl的亲和力遵循T1＞ Cu＞ Zn＞ Pb＞ Co＞ Mn＞ Sn＞ Hg的顺序。实验数据表明，排放物中的一些微量有毒元素（铜，锌，砷，硒，镉，锡，锑，汞和铅）富集，通过热力学平衡计算获得了很好的一致性。在Fe，Mn，Co，Cr和Sn的情况下，底灰中的计算值被高估，粉煤灰中这些元素的预测量为零。相比之下，实验结果表明，这些元素中有80％保留在粉煤灰中。这意味着存在其他步骤导致小颗粒被铁，锰，钴铬和锡富集。这样的机理可以包括在从底部灰烬颗粒的煤中挥发出小的无机颗粒的过程中的喷射，或者将包含这些金属的炭分解成小的飞灰。另一方面，粉煤灰中As，V，Cu，Cd，Sb，Tl和Pb的相对富集因子略有高估或相似，而底部灰烬的预测值为零。我们的实验结果表明，这些元素中约有5％或更少被保留在底部灰烬中，因此它们很可能保留在未燃烧的煤炭内部的底部灰烬中。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号