Further validation of DEM modeling of milling: effects of liner profile and mill speed
Further validation of DEM modeling of milling: effects of liner profile and mill speed
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DOI：
10.1016/j.mineng.2003.07.003
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发表时间：
2003-10-01
影响因子：
4.8
通讯作者：
Moys, MH
中科院分区：
文献类型：
--
作者：
Hlungwani, O;Rikhotso, J;Moys, MH
磨米尔斯通常衬有提升器以提高效率。在操作过程中，升降器会磨损。这将影响米尔斯的能量效率和能力以及磨机中的负载的行为，并最终导致更换磨损的提升器。然而，在以往的旋转米尔斯磨功率模型中，均未考虑斜顶的影响。离散单元法（DEM）能够演示升降机轮廓对磨机功率和负荷行为的影响。在本文中，两种类型的升降机的轮廓，方形和梯形，在轧机功率和负载行为与2D轧机和DEM模拟器，Millsoft，在很宽的转速范围内进行了研究。与实验结果相比，DEM令人满意地预测了不同升降机轮廓在亚临界速度下的负载行为和功率消耗。结果表明，梯形举升器比方形举升器具有更大的功率。已尝试使用实验负载行为的照片来解释测量功率和模拟功率之间的差异。(C)2003 Elsevier Ltd.保留所有权利。
Grinding mills are usually lined with lifters to improve their efficiency. During the course of operation, the lifters are worn away. This will affect the energy efficiency and capacity of mills and the behavior of the load in the mill and finally leads to a relining to replace the worn lifters. However, the effects of the profiles of lifters are not taken into account in all the previous power models for rotary mills. Discrete element method (DEM) is capable of demonstrating the effects of lifter profiles on mill power and load behavior. In this paper, two types of lifter profiles, square and trapezoidal, are investigated in terms of mill power and load behavior with a 2D mill and a DEM simulator, Millsoft, over a wide range of rotational speed. DEM satisfactorily predicted the load behavior and power draw for different lifter profiles at sub-critical speeds comparing with the experimental results. It is found that the trapezoidal lifters draw more power than the square lifters. An attempt has been made to explain the difference between measured and simulated power using photographs of experimental load behavior. (C) 2003 Elsevier Ltd. All rights reserved.