快滤池进水渠道内堰板的正交试验与优化设计

Orthogonal test and optimization design of weir plate in the water channel of rapid filter

为了提高快滤池的利用率和生产效率,提出在快滤池进水渠道内添加堰板的方案.以镇江金西自来水厂为例,采用拟水平方法设计L9(34)正交表,选取了堰板距进水渠道前端面的距离、高度和宽度因素,每个因素取3水平,设计了9种堰板.然后采用CFX中的均相流自由表面模型和基于SST模型的k-ω方程的数值模拟方法,对渡槽、过渡段和快滤池进水渠道内的自由表面流动进行了数值模拟.以各虑池流量均布为优化目标,确定最优方案并进行现场改造试验.试验结果证明:1号滤池的流量提高了16.5%,各池流量较均匀分布,最高差异为1.4%.均相流自由表面模型为自来水厂等水利工程提供新型的优化设计方法.

In order to improve the utilization and productivity of rapid filter,an innovative solution was proposed to add weir plate in the water channel of rapid filter,which located in Zhenjiang Jinxi water purification plant.Using the proposed level method,the experiment orthogonal table L9（34）was designed.Three factors,which contained the weir plate height,width and length away from the first inlet were selected and each factor was took three levels to design nine types of weir plates.According to homogeneous model and free surface model and k-ωSST model,the free surface flow of aqueduct,transitional section and water channel of rapid filter was numerically simulated.Then making the uniform flow distribution as the optimization target,the optimized set of parameters were obtained.Experimental results show that the flow rate of the No.1filter tank increases 16.5%.Each filter tank flow rate distributes more evenly and its maximum difference is only 1.4% among them.The results of adding weir plate are significantly and it also proves that homogeneous model is reliable using in the area of water plant or other water conservancy projects.