Analysis Of Defogging Efficiency And Position Of Internal Droplet Drop Point Of Combined Demister

Judging from China’s existing energy structure layout,China will continue to be dominated by thermal power for a long time to come.With the new requirements of SO2,NOx and dust emission concentration of coal-fired power plants in China,it is necessary to further improve the defogging efficiency of demisters.The defogging efficiency of demisters with different structures is experimental and numerical simulation The pressure drop and the pressure drop were studied,and the position of the drop point of the droplet inside the demister was analyzed.The purpose was to improve the trapping ability of the drop droplet,and to obtain the position of the drop point of droplets with different particle diameters The law provides a certain reference for the reconstruction and optimization of the actual demister.The experimental research on different structure demisters found that the combination demister has the best defogging efficiency,followed by the double hook plate demister,followed by the tube type demister and the arc plate demister;the combination of different arrangements The pressure drop and defogging efficiency of the demister are also different.The pressure drop when intersecting is greater than the pressure drop in parallel.When the tube demister is arranged in parallel below,the defogging efficiency is slightly higher than that of the tube demister in parallel.Defogging efficiency during layout.The simulation results show that the arc plate has a poor trapping efficiency for droplets smaller than 20 μm,the double hook plate has a lower trapping efficiency for droplets smaller than 15 μm,and the tubular demister is effective for liquids with a particle diameter of 10 to 40 μm.The drip trapping ability is better,but the maximum trapping efficiency is only 80%.The trapping efficiency of the combined demister for different particle diameters is better than that of the demister;the combination of the demistering efficiency and the fan power consumption is analyzed.When the demisters of different structures reach the same defogging efficiency,the tubular demister has good capture efficiency and small fan power consumption when arranged in parallel above;when the inlet flow rate is increased,the left and right wall surfaces of the demister and the first One layer of round tube wall faces the droplet trapping ability.Except for the tube type demister,there is a large difference between the left and right wall surfaces of the same structure demister on the droplet trapping ability and the position of the drop point.The trapping ability of the right wall facing the droplets is greater than the trapping ability of the left wall;the same wall facing droplets of the same structure of the demister of different structures and the capturing position are basically the same,but the right wall of the double-hook demister facing the droplets The capture position has been advanced;other structures except tube demisters The collection of droplets with a particle size of 15-40 μm on the left wall of the demister mainly occurs at 15-50 mm and 70-100 mm on the right wall.There is no obvious rule for the collection of droplets with a particle size less than 15μm on different walls.The positions of the round tube wall in the tube type demister and the combined demister for the higher collection efficiency of droplets are mainly on the side walls of the first two layers of round tubes.