Flow Simulation And Parameter Optimization Of Vortex Coagulation Clarifier Reaction Zone Based On Fluent

The research project is a new type of highly efficient vortex coagulation clarifierdeveloped by East China Jiaotong University. The research is using combined method offluent in CFD software and experimental, validation and analysis the relevant flow parametersof vortex coagulation clarifier reaction zone, proposed the influence factors and law onflocculation.The main content of the research in the article:(1) Through the analysis and investigation of the actual experimental device andreference of related literature. For this experiment, determine the suitable turbulent model andrelated calculation parameters, the establishment of numerical model and to simplify it.Calculate the results of a flow field operating conditions and comparison with theexperimental conditions, to validate the model correctness.(2) Appropriately simplified model, calculated the flow state of first reaction zone andthe second reaction zone under the different opening rate of vortex reactor, different flow andother conditions, analyze the vortex size, floc formation and collision, optimizing influentparameters.(3) Comparison experiment between the vortex coagulation clarifier with vortex reactorand without vortex reactor, testing indicator parameters of water turbidity, floc particle size,Zeta potential and so on, Search the relationship between water turbidity and detection project,and comparative analysis with the results of simulation calculation.(4) Comparison experiment between the vortex coagulation clarifier with the differentwater flow. Calculated the values of G and GT of three different water flow within the targetrange in the traditional coagulation control. Testing indicator parameters of water turbidity,floc particle size, Zeta potential and so on, Search the relationship between water turbidityand detection project, and comparative analysis with the results of simulation calculation.Through the graphic curve drafted by the vortex coagulation clarifier reaction zonesimulation results, use simulation evaluation index--turbulent kinetic energy k, turbulentkinetic、energy dissipation rate ε、velocity distribution to analysis and research on the flowpattern of vortex coagulation clarifier reaction zone.The main research results are as follows:(1) According to the analysis of the experimental device and related literature reference,determined using the turbulence model of the standard k-epsilon and simulation andexperiment the vortex coagulation clarifier without vortex reactor, Sure to select the correct model through compared and verification with them.(2)The cone area angle calculation results of simulation vortex coagulation clarifierreaction zone, when conical region and horizontal angle α=55°, turbulence kinetic energyand velocity change regularity displayed by the image, backwater area reduced, coagulationeffect is good, to form large and dense alum easier, and can not cause waste of coagulant andspace.(3) Search on the vortex coagulation clarifier reaction zone with vortex reactor andwithout vortex reactor. The results obtained according to the mutual analysis with thenumerical simulation and field experiment. After joining the vortex reactor, a lot of microvortex formed in vortex coagulation clarifier reaction zone, turbulent kinetic energy k andturbulent kinetic energy dissipation rate ε are relatively high. Dosage within a certain range,the vortex coagulation clarifier with vortex reactor compare with the vortex coagulationclarifier without vortex reactor which zeta potential and floc particle size are rises higher,these conditions created the effective collision between the particles. So the vortexcoagulation clarifier with vortex reactor operation effect is better than the vortex coagulationclarifier without vortex reactor.(4) Search on the different water inflow of vortex coagulation clarifier reaction zone withvortex reactor. The results obtained according to the mutual analysis with the numericalsimulation and field experiment. The turbulent kinetic energy k and turbulent kinetic energydissipation rate ε increases with the increase of the three influent flow of6m~3/h、8m~3/h、10m~3/h. The increase in the number of micro vortex with the increase of water inflow can alsobe seen in the diagram of the simulation. Dosage within a certain range, the zeta potential andfloc particle size are rises higher with the increase of the influent flow, these conditionscreated the effective formation of floc. But considering the hydraulic shearing force of conearea of vortex coagulation clarifier reaction zone of water inflow of10m~3/h is too large, thecontact time between the particles is too short, the collision opportunity of transverse sectionreduced. After a comprehensive analysis, under the conditions of the model, the effect ofwater quality, amount of dosage and other comprehensive is better under the influent flow of8m~3/h.