Simulation Research On Mixing Characteristics And Chemical Reaction Of Multiphase Flow In Rotary Spray Desulfurization Tower

In view of the current severe air pollution situation and the gradual tightening of pollutant emission standards,flue gas purification has become one of the hot research topics in the environmental field.Following the implementation of conventional ultra-low emission control of atmospheric pollutants in the thermal power industry,air pollution emissions from non-electricity industries,especially the steel industry,have attracted much attention.Spray Dryer Absorber(abbreviated as SDA)desulfurization process is often used for sulfur oxides emission control in the sintering and pellet process of the steel industry.However,the removal efficiency of this technology is relatively low.It is necessary to upgrade and improve the SDA tower to achieve ultra-low emissions of SO₂ and SO₃,and effectively reduce the emissions of SO₂ and SO₃ in the steel industry.It is of great significance to improve the atmospheric environment.In this paper,Computational Fluid Dynamics(abbreviated as CFD)technology is used to simulate a number of parameters such as the flue gas field,temperature field,and concentration field in the SDA tower,and the simulation analysis results are compared with actual engineering field test data,further optimize the calculation model,and propose an improvement plan for the SDA tower to guide the engineering transformation.The main research contents and results are as follows:First,a corresponding mathematical model was established for the actual working conditions of the SDA tower,and the accuracy of the model was verified by simulating its actual operating boundary conditions.At the same time,by analyzing and comparing the simulation results in the SDA tower under different working conditions,the effects of the flue gas flow and the concentration of the absorbent Ca(OH)₂ on the chemical reaction process and desulfurization efficiency in the SDA tower were explored.Second,an improved scheme for the central air inlet deflector is proposed,which is to improve the uniformity of gas-liquid two-phase flow around the tower by changing its number of blades,so as to promote the chemical reaction in the tower and reduce uneven wear of equipment.Through analysis and simulation results,it was found that increasing the blade to 20 blades can improve the flow of flue gas.Third,on the premise that the total spray slurry volume in the absorption tower is unchanged,different layout schemes of rotary atomizers are proposed.The simulation results show that this scheme can effectively improve the desulfurization efficiency,and the more the number of rotary atomizers The more uniform the layout,the more conducive to the improvement of efficiency.When 4 rotating atomizers are arranged,the removal efficiency of SO₂ is increased from 82.96%to 89.48%,and the removal efficiency of SO₃is increased from 99.28%to 99.74%.