两相旋流分离器矿浆内部流场及分离特性研究

doi:10.16180/j.cnki.issn1007-7820.2020.04.010

摘要/Abstract

摘要：

利用两相旋流分离器可以实现矿浆的浓缩和液体澄清。为探索两相旋流分离器内部流场及分离特性,文中通过CFD软件Fluent,采用RNG k-ε湍流模型,对两相旋流分离器内部的三维流场进行数值模拟,得出了压力、速度、体积分布、湍流动能和湍流耗散率等参数的分布情况。结果表明,两相分离旋流器内部径向速度由中心沿径向外逐渐增大,离近分离器壁时又逐渐降低,呈现出“M”型驼峰分布。轴向速度呈对称分布,最大值出现在顶部溢流口和底流口。从矿粒和水在旋流器内部的流动轨迹可以看出,矿浆浑浊液从切向进口进入旋流分离器后,矿粒和水在旋流分离器内部作高速旋转运动,形成外旋流和内旋流。密度较重的矿粒从下部底流口流出,密度较轻的水从上部溢流口流出,模拟两相分离效率可达到86.93% 。

关键词: 两相旋流分离器, Fluent, RNG k-ε湍流模型, 三维流场, 数值模拟, 分离特性

Abstract:

The two-phase cyclone separator can complete concentration of the slurry and liquid clarification. In order to explore the internal flow field and separation characteristics of the two-phase cyclone separator, the three-dimensional flow field inside the two-phase cyclone separator was numerically simulated by Fluent of the CFD software using the RNG k-ε turbulence model. Then, the distribution of parameters such as the pressure, velocity, volume distribution, turbulent flow energy, and turbulent dissipation rate were obtained. The results showed that the internal radial velocity of the two-phase separation cyclone gradually increased from the center to the outside, and gradually decreased approaching the separator wall, showing an “M” type hump distribution. The axial velocity was symmetrically distributed and the maximum value appeared at the overflow opening and the bottom opening. From the flow trajectory of the ore particles and water inside the cyclone, it could be seen that after the slurry turbid liquid entered the cyclone separator from the tangential inlet, the ore particles and water rotated at high speed inside the cyclone separator to form an external swirling flow and internal swirling. The heavier density of the ore particles flowed out from the lower bottom opening, and the lighter density water flowed out from the upper overflow opening. The simulated two-phase separation efficiency reached 86.93%.

Key words: two-phase cyclone separator, Fluent, RNG k-ε turbulence model, three-dimensional flow field, numerical simulation, separation characteristics

中图分类号:

TP31

杨艳斌,何伟,郭彦军,赵浩,慕亚亚. 两相旋流分离器矿浆内部流场及分离特性研究[J]. 电子科技, 2020, 33(4): 55-60.

YANG Yanbin,HE Wei,GUO Yanjun,ZHAO Hao,MU Yaya. Study on Internal Flow Field and Separation Characteristics of Two-Phase Cyclone Separator[J]. Electronic Science and Technology, 2020, 33(4): 55-60.

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