Abstract The current research work focused on the effect of the heterogeneous distribution of elements on the ash melting behavior of Zhundong coal at the sub-particle scale by using a high temperature stage microscope (HTSM) and scanning electron microscope (SEM) equipped with energy dispersive spectrometry (EDS). Experimental results showed that both molten and unmolten areas existed in the residual ash sample after combustion below 1200 °C. Below this temperature, the partial ash melting behavior was significantly found during the ash melting process. Comparing the element composition of local molten and unmolten areas, Na, Si and Mg played predominant roles in the partial melting behavior. The enrichment of Na and Si promoted the formation of low temperature eutectic mixture and further molten areas, while the unmolten areas were rich in Mg. Combined with the micro-Raman analysis, minerals like spinel and forsterite that containing Mg were the main refractory components in the unmolten areas. Thermodynamic calculation results from FactSage software showed that the mass fraction of the liquid phase started to form rapidly at about 1100 °C in molten areas mainly with the fast melting of olivine and nepheline. However, the unmolten areas started to melt swiftly at about 1200 °C mainly with the fast melting of merwinite. Spinel was the main refractory component in both molten and unmolten areas.

中文翻译：

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基于元素非均质分布的准东煤灰熔融行为亚颗粒尺度研究

摘要 目前的研究工作主要是利用高温载物台显微镜（HTSM）和配备能量色散仪的扫描电子显微镜（SEM），在亚颗粒尺度上对准东煤的非均质分布对煤灰熔融行为的影响进行了研究。光谱（EDS）。实验结果表明，1200℃以下燃烧后的残灰样品中同时存在熔融区和未熔融区。在该温度以下，在灰熔化过程中显着地发现了部分灰熔化行为。比较局部熔融和未熔融区域的元素组成，Na、Si 和 Mg 在部分熔融行为中起主要作用。Na和Si的富集促进了低温共晶混合物的形成和进一步的熔融区，而未熔融区则富含Mg。结合显微拉曼分析，含镁的尖晶石和镁橄榄石等矿物是未熔区的主要难熔组分。FactSage 软件的热力学计算结果表明，液相的质量分数在 1100°C 左右开始在熔融区域迅速形成，主要是橄榄石和霞石的快速熔融。然而，未熔化的区域在 1200 °C 左右开始迅速熔化，主要是由于墨云石的快速熔化。尖晶石是熔融区和未熔融区的主要耐火成分。FactSage 软件的热力学计算结果表明，液相的质量分数在 1100°C 左右开始在熔融区域迅速形成，主要是橄榄石和霞石的快速熔融。然而，未熔化的区域在大约 1200 °C 开始迅速熔化，主要是由于墨云石的快速熔化。尖晶石是熔融区和未熔融区的主要耐火成分。FactSage 软件的热力学计算结果表明，液相的质量分数在 1100°C 左右开始在熔融区域迅速形成，主要是橄榄石和霞石的快速熔融。然而，未熔化的区域在大约 1200 °C 开始迅速熔化，主要是由于墨云石的快速熔化。尖晶石是熔融区和未熔融区的主要耐火成分。