A novel process combining heterogeneous condensation of water vapor and WFGD system to separate fine particles from desulfurized flue gas is presented. Supersaturation was achieved by means of adding steam into the particle growth region, which was above the liquid phase inlet in desulfurization tower. The condensation grown droplets are effectively removed by the wire mesh demister. The results indicate that the initial particle number concentration have an important influence on the effectiveness of WFGD system for the removal of fine particles. Lower fine particle removal efficiency is obtained when the initial particle number concentration increases. The influence of inlet flue gas temperature is related to whether steam is added. For the case without steam addition, fine particles number concentration decreases with increasing the temperature of inlet flue gas. However, in the case of steam addition in the particle growth region, the removal efficiency of fine particles is improved significantly, and it decreases with increasing the temperature of inlet flue gas. The removal efficiency
of fine particles decreases as the temperature of desulfurization liquid increases. In addition, the removal efficiency rises with increasing amount of added steam. The improvement of number concentration removal efficiencies of at least 40–60% can be attained by adding 0.08 kg steam per Nm3 flue gas. Additionally, further studies are necessary to provide theoretical basis for industrial application by combining heterogeneous condensation of water vapor and wet flue gas desulfurization (WFGD) system.