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Marcela V. C. Machado Dyrney A. Santos Marcos A. S. Barrozo Claudio R. Duarte 《化学工程与技术》2017,40(10):1835-1843
An experimental and numerical study on the grinding media dynamics inside a baffled ball mill under different solid‐flow regimes, namely, cascading, cataracting, and centrifuging, is described. The Eulerian approach was used for all simulations and the boundary condition at the drum wall was investigated by means of the specularity coefficient parameter. This effort is an important approach in representing the particle‐wall interaction in a ball mill. The restitution coefficient of the balls was experimentally measured using a video camera, and its influence was evaluated by comparing the numerical and experimental outcome of flow patterns. The simulations results proved that the specularity and restitution coefficients effects at the drum wall were more evident at high rotational speeds. 相似文献
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论文就球磨机中研磨体大小对水泥熟料的破碎速率、初始破碎分布函数和粒度分布规律进行研究,实验所用研磨体的尺寸为φ20 mm, φ30 mm和φ40 mm,物料为-1.70+1.18 mm粒级的水泥熟料.研究结果表明:不同大小的研磨体对水泥熟料的粉磨遵循一级粉磨动力学方程,破碎速率随研磨体尺寸增大;初步研究认为研磨体大小对初始破碎分布参数有一定的影响;粉磨较短时间如16 min以前,大尺寸研磨体(φ40 mm 和φ30 mm)粉碎得到的细粉量多于小尺寸研磨体(φ20 mm), 延长粉磨时间到32 min以后,三种研磨体粉碎得到的水泥熟料的粒度分布相当. 相似文献
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球磨机是陶瓷生产中广泛使用的细碎设备,也是主要的耗电设备之一,因此球磨机生产效率的高低直接影响企业的经济效益。本文在此只对一般没引起广泛重视的球磨机填充系数问题,结合本厂生产实际谈几点看法。工研究目的及意义众所周知,采用湿法生产工艺,料、球、水三者比例是控制生产的主要参数。但是,日常生产中研磨球会不断损耗,数量和级配会发生变化,造成料、球、水的配比改变;磨衬也会不断磨损,引起球磨有效内径不断扩大,如果不及时调整装载量及配比,既影响磨机的单位产品电耗,也不能充分发挥球磨机的潜在能力,从而综合效率难… 相似文献
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