Experimental Study On Dust Removal Performance Of Turbulent Scrubber For Smelting Flue Gas

The smelting industry is developing steadily.The smelting flue gas emissions are large and produce a large amount of fine particulate matter,which has a great negative impact on the human body and the environment,and its safe emissions are getting more and more attention.The turbulent scrubber is a kind of wet dust collector that makes the washing liquid come into contact with the dust-containing air flow in reverse and produces high-speed collision.Compared with other types of dust collectors,it has the advantages of simple structure,low cost,and small floor space,but it is adjustable The performance is low and the dust removal efficiency for fine particles is not high.In order to improve the dust removal performance,the structure optimization of the dust collector and the search for the best operating parameters become particularly important.This paper uses a combination of physical and numerical simulation to optimize the equipment and operating parameters of the turbulent scrubber,and studies the effects of the equipment parameters and operating parameters of the turbulent scrubber on the gas-liquid two-phase flow pattern and dust removal efficiency.The effects of different nozzle axial cut ratios and gas-liquid flow rates on the flow pattern of the turbulent scrubber were investigated,and the dust removal performance of the turbulent scrubber was studied.The types of dust,the gas-liquid two-phase flow pattern,the axial cut ratio,and the The influence of liquid-gas ratio and inlet dust concentration on the dust removal efficiency of the turbulent scrubber,and the dimensional analysis of the dust removal efficiency of the turbulent scrubber under the best operating parameters,establishes the relationship between the dust removal efficiency and its influencing factors.The main research conclusions are as follows:（1）When adjusting the nozzle axis-cut ratio,the gas-liquid two phases in the scrubber will have four flow patterns:hollow cone,foam,circulation and liquid column.When the flow pattern is a foam type,the radial distribution of gas holdup is low,the axial distribution of turbulence intensity and pressure drop are relatively high,the liquid phase covering effect is good,and the gas-liquid collision is strong.Adjusting the liquid-gas ratio,the gas-liquid phase in the scrubber presents four different states:laminar flow,foam,atomization and bubbling.The analysis shows that foam is the best operating flow pattern and has the best gas-liquid collision.And mass transfer effect.The area of the foam area where the axial-cut ratio of the nozzle is 0.5,0.8,and 1.2 is the largest in the graphs,and it decreases with the increase of the axial-cut ratio.（2）The dust removal efficiency of the foam type is much higher than that of other flow types.When the axial cut ratio is about 0.5 to 0.8,the dust removal efficiency is higher than that of other axial cut ratios.The dust removal efficiency of the turbulent scrubber increases with the increase of the liquid-to-gas ratio and the inlet dust concentration,and the maximum dust removal efficiency concentration is 12 g/m3.The best operating condition is that the nozzle axial cut ratio is about 0.5 to 0.8,the gas-liquid two-phase flow pattern is foam type,and the liquid-gas ratio is about 0.004.（3）Under the optimal turbulent scrubber equipment and operating parameters,the dust removal efficiency for particles smaller than 2.5 μm（PM2.5）can reach 98.35%;for particles larger than 5 μm,the dust removal efficiency can reach 99%Or more;for particles with a particle size greater than 10 μm,the dust removal efficiency can reach more than 99.81%;for particles with a particle size greater than 20 μm,the dust removal efficiency is almost 100%.（4）Based on the physical simulation platform of the turbulent scrubber,the influencing factors of the dust removal efficiency are studied,and two criterion equations are obtained when the nozzle axial cut ratio is 0.5 and 0.8 respectively through the dimensional analysis method:（5）According to the empirical formula of the dust removal efficiency of the turbulent scrubber,the influence of the liquid flow rate,gas flow rate and inlet dust concentration on the dust removal efficiency is analyzed,and the empirical formula is obtained:（a）The influence of liquid flow rate on dust removal efficiency:η_0.5=0.99346Q⁰.08929η_0.8=0.99331Q0.09566（b）The influence of gas flow rate on dust removal efficiency:η_0.5=1.22145G-0.03811η_0.8=1.1 99 96G-0.03515（c）The influence of imported dust concentration on dust removal efficiency:η_0.5=0.9752Cp^0.0069η_0.8=0.97228Cp^0.00851...