The emission characteristics of aerosols were investigated experimentally during the ammonia-based wet flue gas desulfurization(WFGD)process

according to the practical operation condition of Marsulex ammonia-based desulfurization process of Yangzi Thermal Power Plant.The electrical low pressure impactor(ELPI)

scanning electron microscopy(SEM)and XRD were employed to analyze the aerosol particle size distribution and concentration

morphologies and compositions before and after the desulfurization.The results showed that

agreat amount of aerosol particles were formed during the ammonia-based desulfurization process.A large number of these particles were sub-critical particulate matters

and these aerosol particles of which the mass concentration appeared a bimodal distribution were mainly micro-size or larger than 10μm.Moreover

after the desulfurization

the physical properties of the particles changed significantly.These particles had the smooth surface and regular crystal structure

including cuboid and prismoid crystal habits.Sulfur and oxygen content in these particles increased obviously

and main compound in the particles was ammonium sulfate((NH4)2SO4).The solid fine particles generated by evaporation of droplets brought out by flue gas were the major source of aerosol emitted from the Yangzi Thermal Power Plant.