Numerical Simulation On Fine Particles Removal From Converter Flue Gas By Vapor Condensation

The Dry dusting technology of converter has the advantages of high dust removal efficiency and saving new water etc,however,the collection efficiency of submicron particles is low.The evaporative cooler(EC)is taken as the research object.Firstly,the factors affecting the heat transfer efficiency of the EC are analyzed.Secondly,based on the vapor condensation remove fine particles,it is explored how to improve the fine particle collection efficiency.The data and particles were collected in a 65 t converter in a steel factory in Tangshan.The influence of gas-liquid mass ratio on atomized droplet size was analyzed.The effect of droplet size and initial velocity on droplet penetration distance was observed.The effect of different diameters on evaporation efficiency;the effect of different atomized droplet size distribution in the atomization field on the heat exchange efficiency of the EC.Then,based on PBM,the UDF introduces the condensation rate growth function,focusing on the effects of initial particle concentration,steam saturation,temperature and residence time on the condensate growth of the particles.The results show that the increase of vapor saturation is beneficial to the increase of particle size.Keeping the steam saturation constant and increasing the initial temperature of flue gas are beneficial to increase the diameter of fine particles.The higher the initial concentration of particulate matter is,the less favorable it is for condensation.The longer the flue gas stayed in the agglomeration chamber,the larger the particle size was,but the particle size increased to a certain extent and stopped increasing.The technology of vapor heterogeneous condensation can effectively increase the particle size of flue gas at the outlet of EC and improve the efficiency of dust removal.The optimization of dedusting system provides theoretical reference for field production.Figure 40;Table 13;Reference 112...