Development And Application Of A Vortex-mixing Reactor

Vortex reactor is using a hydraulic hybrid for water treatment equipment, themixing efficiency of this reactor is directly affects the effect of water treatment. Theadvantage of vortex reactor is that no mechanical equipment, save power cost,but thedisadvantage is that the hydraulic hybrid has less effective than mechanical mixing.Based on numerical simulation, this article is mainly to optimized the structure ofVortex-mixing Reactor, and analysis of internal flow field, so as to strengthened the mixedeffect and generated hydraulic flow within the reactor.Grid partition of this reactor is using the method of regional grid division.Usingcombination of structured and unstructured grid to grid partition. Because of the flowprocess is turbulent flow state, the solve model is a k model, discrete equation isfirst-order upwind and the discrete phase model is used in flow process. In those solutioncontrol parameters,selects the SIMPLEC algorithm, leave the default values and otheroptions,the solution of the algebraic equation is Guss-Seidle iteration method. Byestablishing the differential equation to control particle phase, and use Gillalgorithm.The results for this study are as follows:（1） Determine the structure and geometry parameters of the reactor.Reactor design mainly adopts the literature [27] about hot metal mixing reaction inthe reactor, applied to water treatment, and reactor diameter ratio determined bysimulation. Simulation results show that the tangential flow into the reactor, with centerinto the reactor of the drug while rotating flow down, and formed near wall flow in thelower throat area, makes the reactor hydraulic retention time lengthen, improve theefficiency of the mixing, decrease the drug’s dosing.The best geometrical parameters of this rector: d2/d1=（0.03～0.07）；d2/d3=0.13～ 0.2；d₄>20mm；d₅<100mm；h₁=（0.2～0.3）d₁；h₂=（0.33～0.5）d₁；h₃=（0.2～0.5）d₃；h₄=（3～4）d₃.The first column diameter is d₁, diameter of throat and mouth is d₂, thesecond column diameter is d₃, inlet diameter is d₄, dosing hole diameter is d₅, The firstcolumn height is h₁, the expand of cone height is h₂, the shrinkage of cone height is h₃,the second column height is h₄.（2） Determine the boundary velocity of different reactor volume.When reactor effective volume is12.3L, the lowest velocity is0.07m/s, thehighest velocity is1.5m/s. When the reactor size is12.3m3and41.5m3, also can getgood mixing efficiency, proved that when the reactor volume changed, can deal withdifferent water, but water inlet diameter should not be greater than300mm.（3） Discussed the feasibility of the reactor used in actual engineering.Calculation the cost of41.5m3in effective volume, including reinforced concreteand steel material of the reactor. The cost of reinforced concrete material cost is RMB164,800, the cost of steel material is RMB36,000. The cost of reactor production withsteel material is cheaper than reinforced concrete material, easy installation anddisassembly, but steel material of the reactor is easy to rust,so need to stain proofing orclean regularly. Calculation the project budget of the reactor, the results show that, watertreatment cost is RMB0.92/d less than the average cost RMB1.2/d, save the cost ofprocessing and energy.The reactor can be widely used in different fields, includes laboratory wastewatertreatment, drinking water treatment, industrial water treatment, recycled back to thewater treatment, small towns water treatment and chemical industry fields etc. allinvolved in solid-liquid mixing and liquid liquid mixing area. Compared with theexisting flocculation tank and mechanical stirring clarification tank, the main advantageis that the reactor was generating internal mixing device, reactor hydraulic flow, shortmixing time, little drug dosing quantity, effective mixing.