Slurry droplets containing fine particles are entrained out of the scrubber in the process of the limestone-gypsum desulphurization

leading to significant impacts on the fine particle emission characteristics. The slurry atomization

entrainment characteristics of desulfurization slurry

and the relationship between fine particle emission and desulfurization slurry characteristics were on-line measured with the Phase Doppler Analyzer (PDA) system and the electrical low pressure impactor (ELPI+). The results show that large numbers of fine droplets and submicron solid particles exist in the flue gas after desulfurization

which attributes to the slurry entrainment during the desulfurization process. The emitted droplet sizes are related to the slurry atomization characteristics. They are mainly less than 20 μm and the solid content ratio of the emitted droplets and the slurry ranges from 20% to 40%. The operating parameters have significant effects on the amount of entrained slurry droplets such as the superficial gas velocity

the liquid gas ratio and the slurry concentration. With the decrease of these operating parameters and the spray optimization such as the increase of spray layers and the proper arrangement of the nozzles

the slurry entrainment is inhibited

resulting in the reduction of fine particle emissions.