Study On Removal Of Fine Particles Based On Chemical Agglomeration

The fine particulate matter emitted by the steel industry is one of the main sources of pollution in the atmospheric environment.Due to the complexity of the high-temperature smelting process,the microscopicity of fine particle formation,and the limitations of existing dust removal equipment,the dust removal efficiency still needs to be improved.Based on the theory of flocculation,this paper analyzed fine particle agglomeration that is divided into three stages: particle nucleation stage,rapid growth stage and stable formation stage of agglomerate structure.SEM was used to observe the microstructure of agglomerated structures.The "bridge" between particles and the agglomeration of submicron particles are the main forms of agglomeration structure changes.FLUENT was used to simulate the flow field in chemical agglomeration chamber.The simulation results indicated that the agglomeration mainly occurs in the area below the cross section of the contact point between the droplet and the wall.When the inlet flow rate is 1 m/s,the collision of the atomized droplets with the particles may be high.The physicochemical characteristics of fine particles in sintering and converter were analyzed,and a chemical spray agglomeration bench for fine particles was designed.The results show that the agglomeration of fine particles by organic agglomerant is better than inorganic agglomerant.The effect of three chemical agglomerates is KGM>PAM>PAC,and 0.1g/L organic agglomerant KGM has the best effect of agglomeration growth of fine particles at 100 °C.The particle size of the sintered dust before and after chemical agglomeration showed a single peak distribution,and the peak particle size increased from 11.565 ?m to 36.806 ?m.The peak particle size of the secondary dust ash of the converter was increased from 0.626 ?m and 3.909 ?m to 13.515 ?m and 22.316 ?m.Pretreatment of fine particles in the flue gas by chemical spray agglomeration can effectively achieve the agglomeration of fine particles and control the emission of fine particles in the flue gas.Figure 42;Table 14;Reference 69...