Study On The Characteristics Of Sintering Flue Gas Dust And Optimization Of The Dust Removal System

With development of steel industry,pollution has become focus of people's attention.Sintering process is one of the most serious processes of particulate pollution in steel enterprises,and particles emission in this process accounts for 40%.Therefore,studying physicochemical characteristics of dust particles,researing dust removal of sintering dedusting system are of great significance to improve dedusting system efficiency.A Tangshan iron and steel enterprise 265m2 sintering machine flue gas particles were selected as research object.Particle size distribution,morphology,chemical composition and phase composition before and after desulfurization were analyzed by using laser particle size analyzer,SEM-EDS,XRD.Thisdedusting system was selected as research object.Geometric model and mesh were carried out based on the ICEM-CFD software.The electrostatic precipitator was simulated in Fluent.According to the simulation results,the electrostatic precipitator was changed into electric bag filter.Then pathlines,contuors of velocity and pressure were analyzed.Dedusting efficiencies of electric bag filter,electrostatic precipitator and bag filter were compared.Results showed great differences in characteristics of big flue sintering particles and particles after desulfurization.The former is mainly affected by sintering materials and process.The latter is mainly affected by semi-dry desulfurization process,desulfurizer and flue gas characteristics.Influence of inlet wind speed,voltage and particles concentration on dedusting efficiency of small particles was studied from two aspects of motion state of particle and fluid.With the increase of inlet wind speed or dust concentration,efficiency decreased gradually.With the increase of voltage,efficiency increases.For electrostatic dedusting system,the capture effect of small particles is poor.The optimized electric bag dedusting system has a higher efficiency than electrostatic and cloth bag dedusting system.The optimization of dedusting system provides theoretical reference for field production.