This study examined elutriation, attrition, and segregation in a conical spouted bed with a fountain confiner and incorporating an open sided draft tube. Fine silica sand with a wide particle size distribution was employed as a model material, operating in both the batch and continuous modes. The use of a fountain confiner is crucial when operating with fine particles, because otherwise the bed rapidly exhibits significant entrainment. The extent of attrition was quantified using a tracing technique based on differently-coloured sand fractions as well as monitoring size distributions by sieving. Particle breakage was found to be the primary attrition mechanism, and the fountain confiner was determined to limit the elutriation of fine particles resulting from breakage. Consequently, only a small fraction of the finest particles were entrained from the bed. The incorporation of a confiner increased operational stability while reducing segregation, especially in the upper half of the bed where the majority of segregation typically occurs. Thus, the bed was perfectly mixed apart from very minimal segregation close to the wall and at the bottom of the contactor. These results provide a basis for the design and operation of larger scale equipment for the continuous drying of materials.

这项研究检查了锥形喷头床中带有喷泉密闭器并结合了敞开侧导流管的淘析，磨损和偏析。使用具有宽粒度分布的细硅砂作为模型材料，以分批和连续模式运行。当使用细颗粒进行操作时，使用润版液密闭器至关重要，因为否则床层会迅速呈现出明显的夹带。使用基于不同颜色的沙子部分的描画技术以及通过筛分监测粒度分布，对磨损程度进行了量化。发现颗粒破裂是主要的磨损机制，并且确定了润版液限制器以限制由破裂引起的细颗粒的淘析。所以，只有一小部分最细的颗粒从床中夹带。限制剂的加入增加了操作稳定性，同时减少了偏析，特别是在通常发生大部分偏析的床的上半部。因此，除了在接触器的壁附近和底部附近有非常小的偏析之外，床被完美地混合了。这些结果为连续干燥物料的大型设备的设计和操作提供了基础。