Abstract Transformation of As in the post-combustion zone has a significant effect on its emission characteristics. In this study, redistribution of As that occurs during the interaction between flue gas and ash has been elucidated using a double-layer fixed-bed reactor at 800–1000 °C. Herein, flue gas and ash samples with different As contents and inorganic components were produced by two varieties of coals. The As content in the ash with high Ca and Al contents increased after interacting with the flue gas with a high As content, indicating gaseous As adsorption. However, the As content in the ash decreased by up to 67% for other cases. The blank experiments showed that the As occurrences in ash were thermally stable, suggesting that the decrease was caused by the action of flue gas. Accordingly, the effect of flue gas components on the release of As from the ash was investigated. It was found that a significant amount of As release was primarily caused by the reaction of gaseous Na in the flue gas with the residual As in ash. A bi-directional interaction was observed between the high-temperature flue gas and ash, which led to the redistribution of As.

中文翻译：

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高温烟气与灰分相互作用过程中砷的再分布

摘要 As 在后燃区的转化对其发射特性有显着影响。在这项研究中，使用双层固定床反应器在 800-1000 °C 下阐明了在烟气和灰分相互作用期间发生的 As 的重新分布。在这里，不同As含量和无机组分的烟气和灰分样品由两种煤产生。与高砷烟气相互作用后，高钙、高铝灰分中砷的含量增加，表明砷吸附为气态。然而，在其他情况下，灰分中的 As 含量下降了 67%。空白实验表明，灰中 As 的出现是热稳定的，表明减少是由烟气的作用引起的。因此，研究了烟气组分对灰中 As 释放的影响。发现大量的砷释放主要是由烟道气中的气态钠与灰中残留的砷反应引起的。在高温烟气和灰分之间观察到双向相互作用，导致 As 的重新分布。