电选摩擦器气体流动及单颗粒运动特性研究

为研究电选摩擦器内气固运动特性,建立了三种摩擦棒不同分布特征的摩擦器数学模型,运用标准k-ε湍流模型及颗粒轨道模型,对摩擦器内气固两相流流场进行了数值模拟,主要研究了气体相对压力场、相对速度场分布情况;并以粒径为10、40、74μm的球形颗粒为研究对象,分析了编号43的单个颗粒运动情况。研究结果表明,摩擦棒对气体流动过程的干扰作用明显,摩擦棒间距对气相流场分布影响很大;摩擦棒背部的负压区和回流区面积沿气体运动方向逐渐增大;摩擦棒分布特征和粒径对摩擦器内颗粒速度变化趋势影响大,颗粒粒径与运动轨迹长度成正比,与速度成反比。

Study on characteristics of gas flow and single particle movement in tribo-electrostatic separation friction device

To study the gas-solid flow movement characteristics in friction device,three kinds of friction device mathematical models with different friction rods distribution were established.The gas-solid flow field numerical simulation inside the friction device was realized using the standard k-ε turbulence and particles trajectory model.The gas relative pressure and relative velocity distribution was researched.The single spherical particle movement with size 10、40、74 μm was analyzed.The results show that the friction rods have an obvious effect on gas flow process.The spacing between friction rods has a strong impact on gas flow field distribution.The negative pressure and circumfluence region area back of the friction rods increases along the direction of gas movement.The friction rods distribution and particle size makes a great impact on the particle velocity inside the friction device.The particle size is in direct proportion to trajectory length and in inverse proportion to the particle velocity.