絮凝反应池中流体的CFD模拟及应用性能

摘要

The flocculation is one of the important in water treatment process,i.e.mixing-flocculation-sedimentation.Based on flocculation mechanism,a stirred-reaction tank and a stirrer are designed to provide suitable hydraulics.Flow distribution in the tank was simulated by computational fluid dynamics（CFD） technique.About 20% of flocculants consumption is saved by using the stirred tank;secondary pollution induced by excessive flocculants is avoided,and the outflow quality is improved.%絮凝反应是原水预处理工艺（混合-反应-沉淀）的重要环节,对整个工艺过程的水处理效果影响极大。本文针对絮凝反应过程中絮体颗粒生长所需的水力学条件,采用计算流体力学（CFD）软件分析了所设计搅拌絮凝反应池运行的可行性,通过控制絮体颗粒生长的流场,使絮体在其中可以生长至合适的尺度。研究结果表明,采用优化之后的反应设备,可以节约絮凝剂用量约20%,降低了生产费用,避免过量絮凝剂对水体造成的二次污染,并且提高了出水效果。