【摘要】：絮凝是凈水處理的重要環(huán)節(jié)之一,絮凝效果的好壞直接關系著后續(xù)構筑物的處理效率。絮凝效果的好壞和絮凝池的水力條件有直接的關系,對絮凝池水力條件進行優(yōu)化改進不僅可以提高絮凝處理效率,而且可以減少混凝劑的投加量,更有利于出水水質的提高。論文主要研究內容是給水處理工程中常用的穿孔旋流絮凝池,論文基于數(shù)值模擬方法模擬分析了穿孔旋流絮凝池的污泥斗高度、上層過水孔洞位置和加入網格板對穿孔旋流絮凝池水力條件的影響規(guī)律。通過使用湍動能k、湍動能耗散率、渦旋速度梯度G0作為絮凝效果評價指標,探究穿孔旋流絮凝池的最佳水力條件,進而優(yōu)化穿孔旋流絮凝池的設計參數(shù)。通過對穿孔旋流絮凝池的模型進行數(shù)值模擬表明:穿孔旋流絮凝池污泥斗高度會影響絮凝處理效果,在保證穿孔旋流絮凝池其他結構尺寸相同的情況下,穿孔旋流絮凝池最優(yōu)污泥斗高度值隨著穿孔旋流絮凝池處理規(guī)模的增加而增加,并且變量不同,通過數(shù)值模擬得到的穿孔旋流絮凝池污泥斗高度最優(yōu)值的變化趨勢就會不同。在穿孔旋流絮凝池中,將上層過水孔洞設置在最高水位以下10cm的位置處,穿孔旋流絮凝池絮凝效果最好。在穿孔旋流絮凝池內加入網格板后,池內水流的湍動能和湍動能耗散率比不加網格板的穿孔旋流絮凝池高。本文的結果對穿孔旋流絮凝池的設計具有一定的實際指導意義和工程參考價值。
[Abstract]:Flocculation is one of the important links in the treatment of clean water, and the effect of flocculation is directly related to the treatment efficiency of subsequent structures. The effect of flocculation is directly related to the hydraulic condition of flocculation tank. Optimizing the hydraulic condition of flocculation tank can not only improve the efficiency of flocculation treatment, but also reduce the dosage of coagulant, which is more beneficial to the improvement of effluent water quality. The main content of this paper is the perforated swirl flocculation tank commonly used in the water treatment engineering. The sludge bucket height of the perforated swirl flocculation tank is simulated and analyzed based on the numerical simulation method. The influence of the position of the over-water holes in the upper layer and the grid plate on the hydraulic conditions of the perforated swirl flocculation tank. By using turbulent kinetic energy k, turbulent kinetic energy dissipation rate and vortex velocity gradient G0 as the evaluation index of flocculation effect, the optimum hydraulic conditions of perforated swirl flocculation tank are explored, and the design parameters of perforated swirl flocculation tank are optimized. Through the numerical simulation of the model of perforated swirl flocculation tank, it is shown that the sludge bucket height of perforated swirl flocculation tank will affect the flocculation treatment effect, and the other structure size of perforated swirl flocculation tank is the same under the condition that the other structure size of perforated swirl flocculation tank is the same. The optimal sludge bucket height value of perforated swirl flocculation tank increases with the increase of the treatment scale of perforated swirl flocculation tank, and the variation trend of the optimal sludge bucket height obtained by numerical simulation will be different with the increase of treatment scale of perforated swirl flocculating tank, and the variation trend of the optimal value of sludge bucket height of perforated swirl flocculation tank is different. In the perforated swirl flocculation tank, the hole in the upper layer is set below the highest water level at the position of 10cm, and the flocculation effect of the perforated swirl flocculation tank is the best. The turbulent kinetic energy and dissipation rate of turbulent kinetic energy in the perforated swirl flocculation tank are higher than those in the perforated swirl flocculation tank without grid plate. The results of this paper have some practical guiding significance and engineering reference value for the design of perforated swirl flocculation tank.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU991.2

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