东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (3): 418-423.DOI: 10.12068/j.issn.1005-3026.2020.03.021

• 资源与土木工程 • 上一篇    下一篇

深锥型浓密机内部流场特性模拟

王学涛1， 崔宝玉1， 魏德洲1， 宋振国2,3   

  1. (1.东北大学 资源与土木工程学院， 辽宁 沈阳110819； 2.矿物加工科学与技术国家重点实验室， 北京100160；3.北京矿冶科技集团有限公司， 北京100160)
  • 收稿日期:2019-06-19 修回日期:2019-06-19 出版日期:2020-03-15 发布日期:2020-04-10
  • 通讯作者: 王学涛
  • 作者简介:王学涛(1990-)，男，辽宁朝阳人，东北大学博士研究生; 魏德洲(1956-)，男，河南南阳人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51504054，51974066)； 矿物加工科学与技术国家重点实验室开放基金资助项目(BGRIMM-KJSKL-2019-03)； 中央高校基本科研业务费专项资金资助项目(N170106004，N170104016).

Simulation on the Internal Flow Field Characteristics of Deep-Cone Thickener

WANG Xue-tao1， CUI Bao-yu1， WEI De-zhou1， SONG Zhen-guo2,3   

  1. 1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2. State Key Laboratory of Mineral Processing，Beijing 100160，China; 3. BGRIMM Technology Group，Beijing 100160，China.
  • Received:2019-06-19 Revised:2019-06-19 Online:2020-03-15 Published:2020-04-10
  • Contact: CUI Bao-yu
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摘要： 应用雷诺应力湍流模型，在网格质量无关性验证基础上对有效容积为4 L的实验室深锥型浓密机内部单相流场特性进行了数值模拟研究，考察了给料流率对速度、剪切强度、湍流强度等特性分布的影响.研究结果表明:浓密机内部速度场基本沿主轴呈对称式分布，并在轴向和径向方向上分别形成上、下分界循环流和交错流；给料流率每增加1.8L/min，轴向速度大约增加0.02m·s-1；给料井内部流体剪切强度高于其他外部区域，剪切强度与给料流率呈正相关性；给料井内部湍流强度峰值区域位于挡板内环边缘和给料井筒体变径处；1.8L/min的给料流率有助于提高湍动能的耗散；给料流率对配置导流锥的给料井回流率影响较小.

关键词: 深锥型浓密机, 流场特性, 数值模拟, 给料流率, 剪切强度

Abstract: Based on the independent validation on mesh quality， the single phase flow field of a lab-scale deep-cone thickener with 4 L capacity was numerically simulated by using the turbulence model of Reynolds stress. The influence of the feed flow rate on the characteristics of velocity， shear and turbulence intensity was systemically investigated. The numerical results showed that the velocity field of the thickener distributes symmetrically along the shaft. The up-down circuit flow is formed in the axial direction. The counterflow and discharging flow is formed in radial direction. The axial velocity increases by about 0.02m·s-1 with every 1.8L/min increase rate of feed flow. The shear intensity in the feedwell is higher than that in any other region of the thickener， and takes on positive correlation to the feed flow rate.The region of high turbulence intensity distributes at the edge of the shelf as well as in the contractile region of the feedwell. A feed flow rate of 1.8L/min in this case presents better dissipation performance of turbulence kinetic energy. The feed flow rate has little effect on the reflux ratio of the feedwell with a deflector.

Key words: deep-cone thickener, flow field characteristics, numerical simulation, feed flow rate, shear intensity

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