Study On Influencing Factors And Characteristics Of Atomization In Converter Flue Gas Evaporative Cooling Process

The high-efficiency and energy-saving converter dry dust removal process（LT）is widely promoted in my country’s steel industry.However,the improvement of ultra-low emission requirements has prompted the efficient capture of fine particles such as PM_2.5and PM₁₀.The atomization effect of the evaporative cooling process in the LT process has an important influence on the dust removal effect.So,it is necessary to study the atomization characteristics of the dual-media nozzle used and its dust removal efficiency.Firstly,the atomization mechanism of gas-liquid two-phase flow and the mechanism of water mist dust removal in evaporative cooler are analyzed.The effects of nozzle structure,gas-liquid ratio and atomizing medium on atomization characteristics were studied by simulation and experiment.The effects of gas-liquid ratio and atomization angle on the internal temperature field of the evaporative cooler were also analyzed.The results show that the gas-liquid shearing effect inside the nozzle is different due to different nozzle outlet shapes;As the gas-liquid ratio increases,the atomization angle first increases and then decreases,and the droplet SMD particle size decreases gradually;With the increase of the wetting agent concentration,the SDS solution better reduces the surface tension of the solution and enhances the primary atomization;Reducing the droplet size and increasing the atomization angle achieves rapid cooling of the flue gas.The effects of the above three influencing parameters on the dust removal efficiency were investigated through the atomization dust removal experiment.The results show that the total wetting time of converter dust with 0.05%SDS solution is 19%shorter than that of pure water;As the gas-liquid ratio increases,the porous nozzle has the best dust removal effect on PM_2.5and PM₁₀when the gas-liquid ratio is 1.25.Studies have shown that by optimizing the above parameters,dust agglomeration can be promoted and dust removal efficiency can be improved.The research results provide a theoretical basis for improving the dust removal efficiency of converters.Figure 43;Table 8;Reference 74...