强化重力分选机流场数值模拟

发布时间：2018-01-29 03:31

本文关键词： 强化重力分选机来复圈水力堰反冲水细颗粒　出处：《煤炭学报》2016年05期 　论文类型：期刊论文

【摘要】：采用数值模拟与试验验证相结合的方法,对离心分选机内的流场分布与颗粒的分离规律进行研究,并对来复圈的结构及反冲水孔的排布进行优化,结果表明:位于分选区和分层区交界处存在的动态水力堰效应具有强化分选的作用;来复圈的结构对分选的影响主要表现在来复圈的截面形状以及反冲水孔的分布。通过模拟研究了来复圈内颗粒堆积规律,并设计出双弧形边壁。来复圈内流膜按照湍流强度可分为3层结构,从上到下依次是弱紊流层、扰动过渡层和射流控制层。反冲水孔数量较多时,射流控制层形成的伪弹性波短而频,适合分选较细颗粒;反冲水孔较少时,伪弹性波长而疏,利于较粗颗粒分选。
[Abstract]:The flow field distribution and particle separation law in centrifugal separator were studied by the method of numerical simulation and experimental verification, and the structure of the loop and the layout of the recoil water hole were optimized. The results show that the dynamic hydraulic Weir effect at the junction of the sub-district and the stratified area has the effect of strengthening separation. The influence of the structure of the loop on the separation is mainly reflected in the shape of the section of the ring and the distribution of the recoil water hole. The inner flow film can be divided into three layers according to the turbulence intensity, from top to bottom are weak turbulent layer, disturbance transition layer and jet control layer. The pseudoelastic wave formed by jet control layer is short and frequency, which is suitable for sorting fine particles. When the recoil water hole is less, the pseudo-elastic wavelength is sparse, which is favorable for the separation of coarse particles.
【作者单位】：中国矿业大学化工学院;中国矿业大学煤炭加工与高效洁净利用教育部重点实验室;
【基金】：国家自然科学基金资助项目(51374206);国家自然科学基金创新群体资助项目(51221462)
【分类号】：TD455
【正文快照】： 重力分选(重选)由于生产成本低、环境污染小而被广泛应用于矿物的分选。随着两相流理论和机械振动学等学科的发展,重选已经从传统的重力与流体作用力为主的分选模式发展为重力与离心力、流体作用力、机械振动力等相结合的复合力场分选新方法[1]。借助强化离心力场的引入可有效

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