Clogging behavior of powder particles in packed bed is a longstanding engineering challenge in many industrial processes, of particular interests to ironmaking reactors. In this work, a CFD-DEM model was developed to investigate the powders clogging in a packed bed with lateral inlet. The flow and clogging of powders of varying gas velocities flowing through the packed bed were studied. The results showed that two kinds of clogging powders inside the porous can be observed. One is mainly due to mechanical interactions between powder particles, which can create arches on packed bed and stop the flow. When the powders form a bridge across the pore throat of the orifice, the bottleneck of void space becomes the starting point for blockage formation. The other represents a part of clogging powders which is due to drag force and friction between one small particle rolling very slowly on the surface of large particles whose spacing is close to the diameter of powders. The powders distribution, mechanical behavior and pressure drop were also discussed. The findings of this work provides a fundamental understanding on clogging behavior of powders in a packed bed with lateral inlet, and is useful for industry processes’ understanding and optimization.

中文翻译：

---

CFD-DEM模拟粉尘在带有侧向入口的填充床中的堵塞

在许多工业过程中，填充床中粉末颗粒的堵塞行为是一项长期的工程挑战，对炼铁反应器尤为重要。在这项工作中，开发了一个CFD-DEM模型来研究粉末在带有侧向入口的填充床中的堵塞情况。研究了流经填充床的气体流速不同的粉末的流动和堵塞情况。结果表明，可以观察到两种堵塞孔内的粉末。一种主要是由于粉末颗粒之间的机械相互作用，可以在填充床上形成拱形并阻止流动。当粉末形成跨过孔的孔喉的桥时，空隙空间的瓶颈成为形成堵塞的起点。另一个代表堵塞的粉末的一部分，这是由于一个小颗粒之间的阻力和摩擦力非常缓慢地滚动在间距接近粉末直径的大颗粒表面上所致。还讨论了粉末分布，机械性能和压降。这项工作的发现为粉料在具有侧向入口的填充床中的堵塞行为提供了基本的了解，并且对于工业过程的了解和优化很有用。