Weiwei Xuan , Shiying Yan , Jingkun Zhang , Sheng Luo , Qi Wang , Jiansheng Zhang
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引用次数: 0
摘要
在液体卸料炉中,炉渣在冷却过程中会产生结晶。晶体的存在会改变炉渣的结构、流动、传热,尤其是粘度会急剧上升。深入了解结晶动力学对优化液态炉渣的流动具有重要意义。由于矿渣中多种成分的复杂性和可变性,不同矿渣的晶体动力学差异很大。本文利用高分辨率的高温显微镜清楚地观察了不同晶体的原位沉淀,并分析了不同晶体的动力学参数。对熔体和析出晶体的显微结构分析表明,熔体中碱性氧结构的比例和碱性阳离子的扩散系数与晶体的生长有直接的关系。熔体的结构参数 St 与晶体生长速率呈正相关。这是在熔体和析出晶体之间架起桥梁的新发现,它为在熔渣冷却过程中控制晶体生长提供了一种方法。
A deep insight into the dynamic crystallization of coal slags and the correlation with melt microstructure
In liquid discharging furnace, crystallization can occur in slags during the cooling process. The presence of crystal changes the structure, flow, heat transfer, especially the viscosity with a sharp increase. A deep understanding of the crystal kinetics is significant to optimize the flow of liquid slag. Crystal kinetics varies significantly with different slags due to the complexity and variability of the multi components in slags. In this paper, a high-temperature microscopy with high-resolution is used to clearly observe the in situ precipitation of different crystals and the kinetic parameters of different crystals are analyzed. Microscopic structure analysis of both the melt and the precipitated crystal shows that the proportion of basic oxygen structure and the diffusion coefficient of the basic cation in the melt have a direct correlation with the growth of crystal. A structural parameter St of the melt is developed, which has a positive correlation with the crystal growth rate. This is a new discovery in bridging the gap between the melt and precipitated crystals and it provides a way to control the crystal growth during slag cooling.
期刊介绍:
Fuel Processing Technology (FPT) deals with the scientific and technological aspects of converting fossil and renewable resources to clean fuels, value-added chemicals, fuel-related advanced carbon materials and by-products. In addition to the traditional non-nuclear fossil fuels, biomass and wastes, papers on the integration of renewables such as solar and wind energy and energy storage into the fuel processing processes, as well as papers on the production and conversion of non-carbon-containing fuels such as hydrogen and ammonia, are also welcome. While chemical conversion is emphasized, papers on advanced physical conversion processes are also considered for publication in FPT. Papers on the fundamental aspects of fuel structure and properties will also be considered.