应用超剪切技术提高水煤浆分散稳定性的数值模拟  

Numerical simulation of application of super-shear technology in enhancing CWM's stability

作　　者：叶申柱[1] 周东[1] 张裕中[1] 

机构地区：[1]江南大学食品装备技术研究中心,江苏无锡214122

出　　处：《煤炭学报》2008年第4期444-448,共5页Journal of China Coal Society

摘　　要：采用Fluent软件及Realizablek-ε模型研究了水煤浆物料在剪切均质泵内的剪切均质过程,分析了齿间周向与径向上的压力场、速度场、湍流应力场以及空化现象,探讨了水煤浆物料受剪切力、摩擦力、撞击力、湍流应力和空化作用不断被剪切均质的过程.表明采用超剪切技术对水煤浆进行剪切均质,物料受剪切力、摩擦力、撞击力、湍流应力等作用能够达到微观上的混合,且转速越高,混合效果越好,更有利于提高水煤浆物料剪切均质后的稳定性.The process of the CWM being sheared and homogenized in homogenizer was investigated using Fluent software packaging with Realizable k - ε model, and the velocity-field, turbulent stress field and pressure-field in the circumference and radius direction between the rotor and stator as well as cavitation phenomenon were analyzed, the process of CWM being sheared and homogenized in a homogenizer as the result of huge forces of shear, friction, impact, turbulent stress and cavitation was also discussed. The results show that the effect of the super-shear technology is much better than traditional mixing model, it can be able to provide mirco-mixing because of the huge forces of shear, friction, impact and turbulent stress, and the higher the rotational speed, the better for the CWM＇ s uniformity is, it＇ s also propitious to enhance the stability of the CWM by using the super-shear technology.

关 键 词：水煤浆 剪切均质 稳定性 数值模拟 

分 类 号：TQ534.4[化学工程—煤化学工程]