From experiments, the influence of the physical characteristics of different binary mixtures of solids on the spouting regime of a pyramidal square-based spouted bed reactor is assessed. The applied methodology permits a more precise evaluation of the effects of the tested variables (diameter, density, sphericity) on the response variables (minimum air flows at which spouting begins and at which to maintain spouting conditions). The associated pressure drops along the bed of particles and the height of the formed fountain are analysed in each case. During the initial stages of fluidisation, binary mixtures containing different density ratios show dead zones. Segregation becomes more evident at large-size and high-density ratios. The lack of sphericity was found to be the main reason leading to blocking, channelling, and start-up problems when system failures occur. Nevertheless, the extent of segregation in all cases decreases with increasing the spouting velocity. In addition, a computational fluid dynamic model based on the discrete element method, previously validated for a single solid bed, is proposed as a tool to predict and evaluate potential segregation phenomena in binary mixtures. This model reproduced with high accuracy the encountered segregation phenomena. Its use may help define the technical limits inherent in the pyramidal spouted bed reactor.

从实验中，评估了不同的二元固体混合物的物理特性对金字塔形方形喷床反应器的喷管状态的影响。应用的方法可以对测试变量（直径，密度，球形度）对响应变量（开始喷射并保持喷射条件的最小空气流量）的影响进行更精确的评估。分别分析沿着颗粒床的相关压降和形成的喷泉的高度。在流化的初始阶段，包含不同密度比的二元混合物会出现死区。在大尺寸和高密度比率下，偏析变得更加明显。发现缺乏球形是导致阻塞，窜动，以及发生系统故障时的启动问题。然而，在所有情况下偏析的程度都随着喷射速度的增加而减小。此外，提出了一种基于离散元方法的计算流体动力学模型，该模型先前已针对单个固体床进行了验证，作为预测和评估二元混合物中潜在偏析现象的工具。该模型以高精度再现了所遇到的偏析现象。它的使用可以帮助定义金字塔形喷头床反应器固有的技术限制。提出将其作为预测和评估二元混合物中潜在偏析现象的工具。该模型以高精度再现了所遇到的偏析现象。它的使用可以帮助定义金字塔形喷头床反应器固有的技术限制。提出将其作为预测和评估二元混合物中潜在偏析现象的工具。该模型以高精度再现了所遇到的偏析现象。它的使用可以帮助定义金字塔形喷头床反应器固有的技术限制。