Speaker
摘要
针对低真空气体分离系统中的粉末影响运行设备运行问题，在欧拉-拉格朗日框架下构建了用于描述气固两相流中颗粒团聚和沉积的动力学模型，模拟计算了不同气体流量下直管、弯管和三通管中的颗粒团聚和沉积特性，以探索使粉末直接沉积或团聚形成大颗粒后重力沉降于管道中，减少进入设备粉末而延长设备元件使用寿命的方法。结果表明，直管内颗粒曳力是颗粒的主要沉积机制，而弯管和三通管内颗粒曳力和惯性力竞争是颗粒沉积的主导机制。可通过增大管道直径等措施促进颗粒团聚增大粒径和延长重力沉降时间，以增大颗粒沉积比例，也可在关键设备前通过优化三通管路设计促进颗粒沉积，但需注意流速值的变化。
Abstract
To address the operational issues caused by powder particles in low-vacuum gas separation systems, a kinetic model describing particle agglomeration and deposition in gas-solid two-phase flow was constructed within the Eulerian-Lagrangian framework. Simulations were conducted to evaluate the particle agglomeration and deposition characteristics in straight pipes, elbow pipes, and tee pipes under varying gas flow rates to explore methods for extending equipment component lifespan. This involves promoting direct particle deposition or agglomeration into larger particles that subsequently settle gravitationally within the pipeline. Results indicate that drag force dominates particle deposition in straight pipes, while drag force and inertial force compete as the primary deposition mechanisms in elbows and tees. Measures such as increasing pipe diameter can promote particle agglomeration to enlarge particle size and extend gravitational settling time, thereby increasing the proportion of particle deposition. Alternatively, optimizing tee pipe configurationsdesigning bends before critical equipment or can facilitate particle depositionelocity changes must be carefully monitored.
| 关键词 | 低真空；团聚；沉积；管道；流速 |
|---|---|
| Keywords | low vacuum; agglomeration; deposition; pipe; particle |
