管式电化学消毒反应器的流动特性及其参数模拟优化

为了提高电化学消毒反应器的传质效率,开发一种带有湍流增强组件的管式电化学消毒反应器.建立反应器物理模型,使用计算流体力学(CFD)研究添加湍流增强组件前、后反应器内部流场的变化,分析主要参数对阳极表面湍流强度的影响,考虑湍流增强对反应器压力损失的影响.结果表明:湍流增强组件通过其叶片的导流作用使流体产生螺旋流动,增大反应器内流体的湍流程度,促进传质效率;在反应器主要设计参数中,湍流增强组件的导流叶个数、导流叶扭转角度和导流叶至电极的距离对阳极表面湍流强度有显著影响;当参数组合为导流叶个数7个,扭转角度30°,导流叶至电极距离90 mm时,阳极表面湍流强度为12.68%,相比无导流叶条件下提高了44%,但也使反应器的压力损失有所增加.

Flow Characteristics and Parameter Simulation Optimization of Tubular Electrochemical Disinfection Reactor

In order to improve the mass transfer efficiency, a tubular electrochemical disinfection reactor with spiral flow turbulence enhancement component was developed. The physical model of the reactor was established, and the changes of the flow field inside the reactor before and after the addition of turbulence enhancement component were studied using computational fluid dynamics(CFD). The influence of the reactor main parameters on the turbulence intensity of anode surface was analyzed, and the influence of turbulence intensity on the pressure loss of the reactor was also considered. The result shows that, the turbulence enhancement component makes the fluid produce spiral flow through its vanes, increases the turbulence degree, and promotes the mass transfer efficiency. Among the main parameters of the reactor, the number of guide vanes, the torsion angle of guide vanes and the distance between guide vanes and electrodes have significant effects on the turbulence intensity of anode surface. When the number of guide vanes was 7, the torsional angle was 30°, and the distance was 90 mm, the turbulence intensity on the anode surface was 12.68%, which was 44% higher than the condition of no vanes. However, the pressure loss of the reactor increased at the same time.