ABSTRACT

This paper studies particle motion and flow field characteristics with fly ash as an example and combine the experiments to analyze the separation process of rotary triboelectric separator in detail. Under boundary reference conditions of 22 kV plate voltage, 3 m/s feed flow, and 1815 r/min (189.95 rad/s) friction wheel speed, it simulated single-particle and particle group movement with different plate voltages and different feeding positions. Simulation of particle movement shows that particles may collide with a plate to cause serious particle mixing when plate voltage is higher. The initial velocity direction of particles is vertical downward and particles enter the separation chamber from the middle of the feeding port as much as possible to achieve better separation. The analysis of the flow field shows that the increase of the feeding airflow speed leads to a higher flow velocity inside the friction chamber and increases turbulence intensity; increases in friction wheel speed enhances flow field uniformity in the friction chamber and it is accompanied by an increase in velocity gradient; The co-flow speed mainly affects airflow field in the sorting room, the increase of co-flow speed within a certain range effectively stabilizes airflow field in the sorting room.

摘要

本文以粉煤灰为例，研究颗粒运动和流场特性，并结合实验，详细分析了旋转摩擦电分离器的分离过程。在22 kV板电压、3 m/s进料流量和1815 r/min（189.95 rad/s）摩擦轮转速的边界参考条件下，模拟了不同板电压和不同进料位置下的单粒子和粒子群运动。对粒子运动的模拟表明，当板电压较高时，粒子可能与板发生碰撞，导致严重的粒子混合。颗粒初速方向垂直向下，颗粒尽可能从进料口中间进入分离室，以达到更好的分离效果。流场分析表明，进料气流速度的增加导致摩擦室内的流速增加，湍流强度增加；摩擦轮速度的增加增强了摩擦室中流场的均匀性，并伴随着速度梯度的增加；合流速度主要影响分拣室内的气流场，在一定范围内增加合流速度可以有效地稳定分拣室内的气流场。