摘要
絮凝是水处理工艺中的重要环节,从水力条件方面优化絮凝工艺有利于提升水处理构筑物的处理效果。本文基于计算流体动力学(CFD)数值模拟对机械搅拌澄清池内部流场和流态的特性进行分析,以涡旋速度梯度G0、湍动能耗散率ε作为絮凝评价指标,针对八种不同规模的机械搅拌澄清池,研究导流室直径变化对絮凝效果的影响,给出了对应的最优导流室直径,得出八种规模的机械搅拌澄清池清水区液面负荷为3.4~3.6 m^3/(m^2·h),比室外给水设计规范中机械搅拌澄清池清水区的液面负荷的取值范围小。可为实际工程设计提供一定的参考。
Flocculation is an important link in water treatment process.Optimizing the hydraulic conditions of flocculation process is conducive to improving the treatment effect of water treatment structures.Based on the method of numerical simulation(CFD),this paper analyzed the flow field and flow characteristics of mechanical stirring clarifier tank.The evaluation indices of flocculation included vortex velocity gradient G0,and the turbulent kinetic energy dissipation rateε.The influence of diameter change of diversion chamber on flocculation effect was studied by observing the mechanical stirring clarifier tanks of eight different sizes.The optimal diversion chamber diameter is obtained,It is concluded that the liquid level load in the clear water area of eight types of mechanical stirring clarifier is 3.4~3.6 m^3(/m^2·h),which is smaller than the value range of the liquid level load in the clear water area of the mechanical stirring clarifier in the out door water supply design code.
作者
王林林
王军
WANG Linlin;WANG Jun(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《中国水利水电科学研究院学报》
北大核心
2020年第1期48-53,共6页
Journal of China Institute of Water Resources and Hydropower Research
基金
合肥工业大学研究生质量工程项目(2018YKC02)
合肥工业大学创新训练计划项目(X201910359208)。
关键词
数值模拟
机械搅拌澄清池
导流室
涡旋速度梯度
湍动能耗散率
numerical simulation
mechanical stirring clarifier tank
diversion chamber
vortex velocity gra dient
turbulent kinetic energy dissipation rate
