| With the continuous development and progress of industry,a lot of wastewater containing heavy metal ions will be discharged in the production process of mining and metallurgy,machinery manufacturing,chemical industry,electronics and other industries.These heavy metals not only affects the daily life of human,also can endanger the survival of human nature,the design and manufacture of the filtering equipment mostly rely on experience,insufficient understanding of filter design parameters of the tower,heavy metal waste water filter processing process due to the entry into the tower cross-sectional area increases suddenly,so there will be a drift phenomenon,cause the adsorbent underused.Along with the computer fluid dynamics(CFD)this kind of software development and progress,of containing heavy metal ion wastewater treatment process simulation has become a reality,using CFD software to filter filtration process simulation of the tower,can be directly observed filtering tower pressure,velocity and other parameters of the flow field,thus shortening the filter design of the tower cost,parameters of filter tower design has a certain reference significance.In this paper,the structure of the filter tower should be optimized to solve the problem that the adsorbent is not fully utilized due to the phenomenon of bias flow in the filtration treatment of heavy metal wastewater.In order to give full play to the role of adsorbent in the filter tower and improve the adsorption efficiency,a throttle plate device is proposed based on the original structure of the filter tower to solve the phenomenon of drift in the filtration process.In this paper,Solid Works software was used to model the filter tower,and the model was imported into Fluent to establish a numerical simulation model.RNG kturbulence model was used to conduct steady state numerical simulation of the filter tower.Through single factor analysis of the structure factors of the filter tower,such as orifice size of the orifice,orifice position,inlet velocity,inlet diameter,orifice thickness and orifice arrangement,it is found that the thickness of the orifice has little influence.On a throttle plate of pore diameter and the position of the throttle plate,inlet velocity and so on five influencing factors of complex 5 factors 4 levels orthogonal numerical simulation analysis,explore the filter tower structure factors for the pressure and velocity distribution,the influence of the cross section analysis for each section in the filter tower pressure and velocity distribution is relatively uniform,the optimal structure parameters.Experiment was carried out on the filtration tower,using activated carbon as adsorbent,Cu SO4 solution as heavy metal wastewater,upon the completion of the filter,in the tower of filter selected multiple sample points,and weighing the quality of the adsorbent,such as by heating the sample from the adsorbent Cu SO4,then using Ba Cl2 solution and Cu SO4 solution extracted by mixed,Ba SO4 precipitation,precipitation by quality and the size of the numerical simulation of flow velocity and pressure size distribution.The results show that the precipitation mass obtained from the experimental data is positively correlated with the pressure and flow velocity curves obtained from the simulation data,and the overall fluctuation trend is basically consistent.The results showed that after adding the throttle plate,the adsorption efficiency of the adsorbent was increased by 17.0% at 2h filtration and 16.1% at 4h filtration.Due to the difficulty in manufacturing the throttle plate and the high cost,a reverse charging and starting scheme is proposed.After analysis,a new filter tower can be designed by combining the throttle plate scheme with the reverse charging and starting scheme. |
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