ABSTRACT

The present paper enumerates a CFD model developed for a 76-mm Dense Medium Cyclone (DMC) using Ansys Fluent Software to gain insights into the separation of particles according to their size and density. The simulation used in this paper includes Reynolds stress model to predict the turbulence inside the cyclone body. An Eulerian–Eulerian multiphase CFD model was applied to model a number of physical aspects such as the separation of coal particles and the segregation of magnetite media solids. The experimental results generated in a laboratory-scale DMC were used for the validation purpose, and the predicted results of CFD have been validated for the flow splits of water, magnetite, and coal. The simulation results obtained from the Eulerian–Eulerian multiphase model reveal that the prediction is in good agreement with experimental results and match reasonably well in terms of the mass flow rates of water, magnetite, and coal. Furthermore, the partition curve of the DMC when mapped for the separation of −3.0 + 0.50 mm size also showed to be in agreement with the experimentally obtained curves. The gravity of cut (SG50) has also been predicted by the Eulerian–Eulerian multiphase CFD model and was found to be in the vicinity of observed experimental value of SG50.

摘要

本文列举了使用 Ansys Fluent 软件为 76-mm 重介质旋风分离器 (DMC) 开发的 CFD 模型，以根据粒子的大小和密度深入了解粒子的分离。本文中使用的模拟包括雷诺应力模型来预测旋风体内的湍流。应用欧拉-欧拉多相 CFD 模型来模拟许多物理方面，例如煤颗粒的分离和磁铁矿介质固体的偏析。在实验室规模的 DMC 中生成的实验结果用于验证目的，CFD 的预测结果已针对水、磁铁矿和煤的流动分流进行了验证。从欧拉-欧拉多相模型获得的模拟结果表明，预测与实验结果非常吻合，并且在水、磁铁矿和煤的质量流量方面匹配得很好。此外，当映射为 -3.0 + 0.50 mm 尺寸的分离时，DMC 的分配曲线也显示与实验获得的曲线一致。切割重力（SG50)也被欧拉-欧拉多相 CFD 模型预测，并被发现在SG50的观测实验值附近。