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Experiments on the Removal of Fine Particles in Existing Air Pollution Control Devices by Chemical Agglomeration

The removals of PM2.5 from coal combustion by electrostatic precipitator (ESP) and wet flue gas desulfurization (WFGD) system with adding chemical agglomeration solution were investigated experimentally based on coal-fired thermal system. The experimental results show that the average diameter of particles could grow more than four times with the effect of wetting, liquid bridge force and adsorption bridging, and the PM2.5 concentration of ESP outlet can decrease 40% under typical flue gas conditions. The removal efficiency of fine PM2.5 is improved about 30% when adding chemical agglomeration solution before desulfurization tower.