旋流气浮装置流场分析及分离效率数值研究

Flow Field Analysis and Numerical Study on Separation Efficiency of Cyclone Air Flotation Device

本文运用欧拉多相流模型对该设计旋流气浮装置内两相流流体动力学实施数值模拟,实际中旋流气浮过程中油滴和气泡相互作用,通过碰撞黏附形成油气混合相,本文简化油–气–水三相流动为油气混合相和水相流动,在给定油气混合相密度700 kg/m3条件下进行浓度场、速度场分析,探究操作参数处理量和分流比对该装置分离效率的影响,模拟结果显示:在含油污水处理量1 m3/h~2.2 m3/h范围内,处理量为1 m3/h时,除油效果最佳,之后随着处理量增加,除油效率下降;当出油口分流比在(0.04~0.16)范围内时,装置的除油效率随着出油口分流比增大而提高,但顶部出油口液体中的含油体积分数下降,综合考量出油口分流比为(0.12~0.16)时,该装置的除油效果较好。This article uses the Euler multiphase flow model to numerically simulate the two-phase fluid dynamics in the designed cyclone air flotation device. In practice, the interaction between oil droplets and bubbles during the cyclone air flotation process forms an oil gas mixed phase through collision adhesion. This article simplifies the oil gas water three-phase flow into an oil gas mixed phase and a water phase flow. Under the given oil gas mixed phase density of 700 kg/m3, the concentration field and velocity field analysis are carried out to explore the influence of operating parameters, processing capacity, and diversion ratio on the separation efficiency of the device. The simulation results show that in the range of 1 m3/h~2.2 m3/h for oily wastewater treatment, the oil removal effect is optimal when the processing capacity is 1 m3/h, and then decreases with the increase of processing capacity;When the oil outlet diversion ratio is within the range of (0.04~0.16), the oil removal efficiency of the device increases with the increase of the oil outlet diversion ratio, but the volume fraction of oil in the liquid at the top oil outlet decreases. Taking into account the oil outlet diversion ratio of (0.12~0.16), the oil removal efficiency of the device is better.