Demisting Performance Analysis And Structure Optimization Of Baffle Demister

The demister plays a key role in many industrial fields due to its excellent performance.Although the traditional baffle demister has high demisting efficiency,it has poor separation effect on small particle size droplets.In order to further improve the total separation efficiency of the demister,especially the separation efficiency of small particle size droplets,and reduce the pressure drop at the inlet and outlet of the demister,this paper studies the demisting performance and internal flow characteristics of the baffle demister through the combination of experiment and numerical simulation.The baffle is added to improve the separation efficiency of the demister for small particle size droplets.At the same time,the structure of the baffle demister is optimized.The perforated plate demister is proposed and analyzed,which provides theoretical support for the optimal design of the demister.The main research contents and conclusions are as follows:(1)Numerical simulation and experimental system construction.The experimental test system of the demister was built,and the defogging performance of the baffle demister was analyzed by collecting the droplet data and pressure drop at the inlet and outlet of the defogger.The three-dimensional model of the wave-plate demister was established.Based on the DES and DPM methods,the demister performance and the internal flow characteristics of the flow channel were calculated and analyzed.The experimental data and numerical simulation results are compared and analyzed to verify the accuracy of numerical simulation.(2)Study on demisting performance of baffle demister with different emission modes.The numerical simulation of the demisting characteristics and droplet motion law of the baffle demister under different baffle angles was carried out according to the single-row single-column,single-row double-column,double-row single-column and double-row double-column arrangement.It is found that the double-row double-column baffle demister has the most obvious improvement in demister performance compared with the baffle demister,but the pressure drop at the inlet and outlet of the demister is also the highest.The performance of the demister of the baffle demister of each discharge mode increases with the decrease of the baffle angle;at the same time,it is found that vorticity can be used to predict and compare the demisting performance of the baffle demister.(3)Structural optimization and performance analysis of the baffle demister.Based on the structural optimization of the double-row double-column baffle demister,a new orifice plate demister was pioneered.The numerical simulation of orifice plate demister under different working conditions is carried out,and the influence of opening radius,orifice angle and inlet gas velocity on demister performance is analyzed.It is found that the demisting performance of the perforated plate demister increases first and then decreases with the increase of the opening radius,and the demisting performance changes more obviously with the decrease of the angle of the perforated plate.It is worth noting that the perforated plate demister improves the separation efficiency of small particle size droplets more obviously.