The Flow Pattern Analysis And Reactor Composition Ratio Of Flocculation Zone In Micro Vortex Based On The FLUENT

The Vortex Clarification Technology developed by East China Jiaotong University has been widely used in water purification plants and sewage treatment plants because of its high efficiency and excellent water quality.However,the internal flow state is not clear,and the experimental study time period is long and the cost is high.This paper used numerical simulation software FLUENT to simulate the inside area of micro-vortex clarifier flocculation,and compared the combination ratio of different reactor.The main content and results are as follow.?1?The velocity contour,turbulent kinetic energy contour,pathlines and vectors of the volume ratios of the micro-vortex reactors were calculated and shown to analyze inside area flow state.And the average velocity,turbulent kinetic energy,energy dissipation and vortex scale of different reactor proportion in different heights were been compared and analyzed.After adding the vortex reactor,the flow state distribution in the tank is even more uniform,and the vortex increases with the increase of the reactor proportion.The surface velocity of the micro-vortex reactor is greater than that of the internal velocity,forming velocity contrast,which is more conducive to the coagulation of the flocs.?2?The adding ratio and flow was simulated to analyze and the effect of flocculation.When the reactor proportions are different,the average velocity,turbulent kinetic energy and vortex scale in the different height of the tank decreased with the increasing height,and the energy dissipation decreased with the increasing height.The average vortex scale of whole tank decreases with increase of the proportion increase,which shows that micro-vortex reactor can reduce the size of vortex in the tank.However,when the ratio up to 41.7%,the effect is not obvious by sequentially adding vortex reactor.?3?Governing factors including reactor composition ratio,flow?flocculation time?and dosage were used to do orthogonal test.The removal rates of turbidity and UV₂₅₄54 were seen as indices to study and verify.The flow state of combination of HJTM-1?41.7%volume ratio?and HJTM-2?27.1%volume ratio?is more uniform,and its average vortex scale in every single height is lower than that of the HJTM-1?68.8%volume ratio?,which means that the hydraulic condition of the former combination is better.The effect of different temperature by simulating is not obvious.And the two-phase flow simulation study needs to be further studied.While under different flow rates the optimal working condition of simulation analysis is Q=8m³/h?the residence time is 12.8min?.?4?Simulation analysis of the type and HJTM HJTM-1-2 type combination ratio under different traffic?flocculation?influence on flow state in the reaction zone,the research results show that the flow of 8 m after/h?that is,the flocculation time is 12.8 min?vortex dimension is 0.924 mm,maintain in good range.?5?By the orthogonal test,it can be seen that the optimal working conditions are:40%HJTM-1 and 30%HJTM-2 vortex reactor combination,and the hydraulic load is 8m³/h,and the dosage is 40mg/L.The result is consistent with the simulation results.