Abstract Blended coal combustion technology was extensively used in coal-fired power plants in China. In order to investigate the in-situ reaction between trace elements and minerals in fly ash during blended coal combustion, a bituminous (HLH), anthracite (ZW) and the blended coal of these two parent coals were combusted in a drop tube furnace at 1150°C. The ash gathered at high temperature segment (HTA) and low temperature segment (LTA) of the furnace were analyzed, respectively. The results indicated that the retention rates of arsenic in HTA were lower than that in LTA, which suggested that arsenic would be re-absorbed by ash during cooling down of flue gas. For HTA the retention rates of arsenic in ash of ZW, Z3H1, Z1H1, Z1H3, HLH were 60.31%, 26.85%, 13.29%, 20.23% and 36.11%, respectively. The arsenic was more difficult to be captured by HTA of blended coal than that of parent coal. As for selenium, the retention rates in HTA of five coal samples were 24.68%, 23.60%, 20.58%, 15.19% and 38.13%, which had the same retention law as arsenic. The results of X-ray diffraction (XRD) demonstrated that the mineral morphology was changed obviously during blended coal combustion. Unlike parent coal, mullite appeared in HTA of blended coal, and peak of mullite was enhanced with proportion of ZW increased in blended coal. It was consistent with the trend of retention of As and Se in HTA. It illustrated that change of mineral species and in-situ reaction between minerals and trace elements significantly affected emission of arsenic and selenium during blended coal combustion.

中文翻译：

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混煤燃烧过程中高温飞灰中砷/硒与矿物质的原位反应

摘要 混煤燃烧技术在我国燃煤电厂中得到广泛应用。为了研究混合煤燃烧过程中飞灰中的微量元素和矿物质之间的原位反应，在 1150 度的滴管式炉中燃烧了一种烟煤 (HLH)、无烟煤 (ZW) 和这两种母煤的混合煤。摄氏度。分别对炉膛高温段(HTA)和低温段(LTA)聚集的灰进行了分析。结果表明，HTA中砷的保留率低于LTA，这表明砷在烟气冷却过程中会被灰分重新吸收。对于HTA，ZW、Z3H1、Z1H1、Z1H3、HLH灰分中砷的保留率分别为60.31%、26.85%、13.29%、20.23%和36.11%。混煤HTA比母煤更难捕获砷。硒在5个煤样HTA中的保留率分别为24.68%、23.60%、20.58%、15.19%和38.13%，保留规律与砷相同。X射线衍射(XRD)结果表明，混煤燃烧过程中矿物形貌发生明显变化。与母煤不同，莫来石出现在混煤的HTA中，随着混煤中ZW比例的增加，莫来石峰增强。这与 HTA 中 As 和 Se 的保留趋势一致。说明矿物种类的变化以及矿物与微量元素的原位反应显着影响混煤燃烧过程中砷、硒的排放。5个煤样HTA中的保留率分别为24.68%、23.60%、20.58%、15.19%和38.13%，保留规律与砷相同。X射线衍射(XRD)结果表明，混煤燃烧过程中矿物形貌发生明显变化。与母煤不同，莫来石出现在混煤的HTA中，随着混煤中ZW比例的增加，莫来石峰增强。这与 HTA 中 As 和 Se 的保留趋势一致。说明矿物种类的变化以及矿物与微量元素的原位反应显着影响混煤燃烧过程中砷、硒的排放。5个煤样HTA中的保留率分别为24.68%、23.60%、20.58%、15.19%和38.13%，保留规律与砷相同。X射线衍射(XRD)结果表明，混煤燃烧过程中矿物形貌发生明显变化。与母煤不同，莫来石出现在混煤的HTA中，随着混煤中ZW比例的增加，莫来石峰增强。这与 HTA 中 As 和 Se 的保留趋势一致。说明矿物种类的变化以及矿物与微量元素的原位反应显着影响混煤燃烧过程中砷、硒的排放。X射线衍射(XRD)结果表明，混煤燃烧过程中矿物形貌发生明显变化。与母煤不同，莫来石出现在混煤的HTA中，随着混煤中ZW比例的增加，莫来石峰增强。这与 HTA 中 As 和 Se 的保留趋势一致。说明矿物种类的变化以及矿物与微量元素的原位反应显着影响混煤燃烧过程中砷、硒的排放。X射线衍射(XRD)结果表明，混煤燃烧过程中矿物形貌发生明显变化。与母煤不同，莫来石出现在混煤的HTA中，随着混煤中ZW比例的增加，莫来石峰增强。这与 HTA 中 As 和 Se 的保留趋势一致。说明矿物种类的变化以及矿物与微量元素的原位反应显着影响混煤燃烧过程中砷、硒的排放。