Study On Removal Of Fine Particles By Chemical Agglomeration Combined With Turbulence

While improving the economic development,heavy industrial production such as iron and steel metallurgy brings serious air pollution pr.Due to its small particle size,fine dust mainly composed of PM_2.5and PM₁₀is not easily captured by dust collector.It is the most important factor for heavy haze pollution.The traditional dust removal method cannot meet the ultra-low emission,and the exploration of co-processing methods to remove fine dust has attracted more and more attention.The research takes the fine dust of the converter,and explores the collective agglomeration mechanism of chemical and turbulent flow and the effect of dust removal.Firstly,using the theory of flocculation and adsorption,the mechanism of three agglomeration is analyzed.By analyzing the force,it is concluded that there are two effects of droplets on fine particles collision and bonding during chemical agglomeration.While turbulent agglomeration is mainly collision.The liquid bridge force is greater than the van der Waals force and the airflow drag force when the two act synergistically.Secondly,through experiments,the removal effects of fine dust in three agglomerations were studied.The research results show that:the removal rate of PM_2.5and PM₁₀in a single chemical agglomeration process is up to 51.46%and 53.13%;in single turbulent agglomeration,the highest removal rates of PM_2.5and PM₁₀reach30.88%and 34.53%.The collective agglomeration experiments show that the removal efficiencies of PM_2.5and PM₁₀can reach 88.69%and 93.32%respectively.Finally,the optimization design was carried out with Design Expert software,and found:when the concentration of the glue solution was 1 g·L^-1,the flue gas flow rate was9 m·s^-1,the nitrogen pressure was 0.5 MPa,and the vertical spacing is 8 cm,the PM_2.5and PM₁₀removal efficiency is 88.96%and 94.13%.Through collective agglomeration,the peak particle size of fine dust is increased by11 to 22 times,which greatly improves the dust removal efficiency,and provides important technical support for efficient dust removal of converter flue gas.Figure 47;Table 16;Reference 100...