脉冲电气浮过程中非均匀流场模拟及分析

针对浮选过程中传统电气浮存在大范围剧烈环流，造成泡絮混合物生长和浮上的干扰较大，导致能量利用率低的问题，提出了采用方形脉冲通电的脉冲电气浮的方式，产生非均匀流场，以减轻环流对泡絮混合物的影响，提高能量利用效率.采用Ansys13.0中的Fluent模块对脉冲电气浮气液两相流场进行了模拟.研究结果表明，与常规电气浮相比，脉冲电气浮非均匀湍流场的能量分布更为合理，微气泡上浮过程中产生的环流程度较小，有利于泡絮混合物的形成和浮选过程.在相同电流密度的前提下，脉冲电气浮的耗电量仅为传统电气浮1/4～1/3，且能达到与传统电气浮近似相同的浮选效果，能量利用效率较高.

Simulation and analysis of inhomogeneous flow field in pulsed electro-floatation

Due to the large scale violent circumfluence in the traditional electro floatation (TEF), there is interference to grown and floatation of the mixture of micro bubbles and floccules, causing lo wer energy utilization efficiency. In this paper, a pulsed electro floatation (PEF) method was proposed by using a square wave impulse direct current. Since the circumfluence in the inhomogeneous field generated by PEF is weaker than that by TEF, the energy utilization efficiency will be improved. Then the liquid bubble flow field of PEF was simulated by using Fluent of Ansys 13.0. The results showed that the inhomogeneous flow field in PEF has a more reasonable turbulence energy distribution and less violent circumfluence induced by micro bubbles floating. This suggests that PEF is helpful to the formation and floatation of the bubble floccules mixture. With the same electric current density, the po wer consumption of PEF is as low as 1/4－1/3 that of TEF, but a similar floatation effect has been reached compared with TEF, so the power consumption efficiency is much better.