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Mechanisms of fine particulates formation with alkali metal compounds during coal combustion

机译：煤燃烧过程中与碱金属化合物形成细颗粒的机理

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摘要

Two types of coals with different sodium (Na) and potassium (K) concentrations were burned in an electrically heated drop tube furnace, to study the formation of particulates in association to alkali metal compounds from the coals. The particulates formed from these coals during combustion were separated by a low pressure impactor (LPI). The particulates collected in each stage of the LPI were analyzed, using an atomic adsorption spectrometer (AAS). The results obtained show that ash particles have bimodal particle size distribution for both coal types. This tendency could be due to the difference of the inherent minerals in raw coals. It was further observed that Na and K were enriched in the fine particulates for both types of coal. There was a dependence of the Na enrichment on the fine particles on concentration of excluded mineral in the raw coals. This work, therefore, showed that the appearance of alkali metal in the ash particles related to the nature of Na and K concentrations in raw coals.
机译：在电加热的滴管炉中燃烧了两种具有不同钠（Na）和钾（K）浓度的煤，以研究煤中与碱金属化合物相关的颗粒的形成。在燃烧过程中，由这些煤形成的颗粒被低压冲击器（LPI）分离。使用原子吸收光谱仪（AAS）分析了LPI每个阶段收集的颗粒。获得的结果表明，对于两种类型的煤，灰分颗粒均具有双峰粒度分布。这种趋势可能是由于原煤中固有矿物的差异所致。进一步观察到，两种类型的煤的细颗粒中都富含Na和K。细颗粒中的Na富集取决于原煤中排除的矿物质的浓度。因此，这项工作表明，烟灰颗粒中碱金属的出现与原煤中Na和K浓度的性质有关。

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