Abstract The gasification reaction of petcoke on wall slag layer was an important issue that should be studied during the co-gasification process of coal and petcoke. In present work, the gasification characteristics of petcoke particles on molten slag surface was investigated using a high temperature stage microscope. The catalytic effect of slag on petcoke gasification on slag surface was demonstrated. The experimental results demonstrated that the catalytic effect of slag only worked when the particle was on the surface of slag. The catalyst vapor had no influence on the reactivity of petcoke. What’s more, the SEM analysis result showed that the reaction surface area of petcoke was decreased as a result of the deposition process. The effect of molten slag on particle temperature could be neglected as a result of the weak endothermic effect. Therefore, the change of petcoke reactivity rely on the synergy between catalytic effect of slag and the decreased reaction surface area. Besides, the increased residence time of petcoke also could increase the carbon conversion compared with that in gasifier chamber.

中文翻译：

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石油焦颗粒在高温熔渣表面CO2气化的原位实验研究

摘要 石油焦在壁渣层上的气化反应是煤与石油焦共气化过程中应研究的重要问题。在目前的工作中，使用高温载物台显微镜研究了熔渣表面石油焦颗粒的气化特性。证明了炉渣对炉渣表面石油焦气化的催化作用。实验结果表明，只有当颗粒位于炉渣表面时，炉渣的催化作用才起作用。催化剂蒸气对石油焦的反应性没有影响。此外，SEM分析结果表明，沉积过程导致石油焦的反应表面积减小。由于吸热效应较弱，熔渣对颗粒温度的影响可以忽略不计。因此，石油焦反应性的变化依赖于炉渣的催化作用和反应表面积降低之间的协同作用。此外，与气化室相比，增加石油焦的停留时间也可以提高碳转化率。