Luo Minghan, Chen Qiuwen, Jeong Taeseop, Chen Jing
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China E-mail:
Department of Environmental Engineering, Chonbuk National University, Chonbuk 561-756, Korea.
Water Sci Technol. 2017 Dec;76(11-12):3044-3053. doi: 10.2166/wst.2017.477.
The photocatalytic degradation process has been recognized as a low-cost, environmentally friendly and sustainable technology for water and wastewater treatment. As a key carrier of the photocatalytic process, the semiconductor TiO has been used in many studies. Analysis and modelling of hydrodynamics in the three-phase flow system can provide useful information for process design, operation and optimization of the three-phase flow photocatalytic reactor, which requires research on the mixing and flow characteristics of the interphase regions in the reactor. In this study, we modelled the hydrodynamics in an internal air-lift circulating photocatalytic reactor using an Eulerian multi-fluid approach. Localized information on phase holdup, fluid flow patterns and mixing characteristics was obtained. The simulation results revealed that the distribution of solid particle concentration depends on the flow field in the internal air-lift circulating photocatalytic reactor. The distance between the draft tube and wall of the reactor and changes in the superficial gas velocity (U) were found to be influential factors in reactor performance. The computational model developed could support optimizing reactor design to improve the hydrodynamics and provide guidance for scale-up.
光催化降解过程已被公认为是一种用于水和废水处理的低成本、环境友好且可持续的技术。作为光催化过程的关键载体，半导体TiO已在许多研究中得到应用。三相流系统中流体动力学的分析和建模可为三相流光催化反应器的工艺设计、运行和优化提供有用信息，这需要对反应器内相间区域的混合和流动特性进行研究。在本研究中，我们采用欧拉多流体方法对内置空气提升循环光催化反应器中的流体动力学进行了建模。获得了关于相含率、流体流动模式和混合特性的局部信息。模拟结果表明，固体颗粒浓度的分布取决于内置空气提升循环光催化反应器中的流场。发现导流管与反应器壁之间的距离以及表观气速（U）的变化是影响反应器性能的因素。所开发的计算模型可支持优化反应器设计以改善流体动力学，并为放大提供指导。
