ABSTRACT

Industrial production frequently experiences clogging of fines in a packed bed, which is also a long-term challenge. To investigate the flow of fines and comprehend the migration and clogging of fines, an unresolved CFD-DEM model was created in this paper. The effects of key variables are examined. It was demonstrated that the clogging mechanism of fins at various diameter ratios was different, and the larger diameter of fines, the more obvious the clogging. The number of inlet particles determines the occurrence of clogging. Fines are more inclined to form stagnant structures in the same place. One key element influencing clogging is the rolling friction coefficient, which regulates particle motion. The quantity of small particles that cause blockages likewise rises as the rolling friction coefficient does. The research enables the knowledge and optimization of industrial production by offering a basic understanding of the blocking behaviour of fines in packed beds.

摘要

工业生产经常遇到填充床中细粉堵塞的情况，这也是一个长期的挑战。为了研究细粉的流动并了解细粉的迁移和堵塞，本文创建了一个未解析的 CFD-DEM 模型。检查关键变量的影响。结果表明，不同直径比的翅片堵塞机理不同，且翅片直径越大，堵塞越明显。入口颗粒的数量决定了堵塞的发生。细粉更容易在同一位置形成停滞结构。影响堵塞的关键因素之一是滚动摩擦系数，它调节颗粒运动。引起堵塞的小颗粒的数量同样随着滚动摩擦系数的增加而增加。