The application relates to the field of
coal-fired
flue gas treatment, and discloses a method for removing SO3 in
coal-fired
flue gas through charging and coagulation, which comprises the following steps: step S1, a pre-charging step: making the SO3
aerosol carry a first polarity charge; step S2, a generating and injecting step: atomizing an alkaline solution into alkaline droplets carrying a second polarity charge; step S3, a coagulation step: using the traveling wave
electric field to drive the relative movement of the two kinds of particles; step S4, obtaining a real-time feedback
signal reflecting the coagulation efficiency; and step S5, dynamically adjusting the operation parameters based on the feedback
signal. Through the traveling wave
electric field, the SO3
aerosol carrying opposite polarity charges and the alkaline droplets are subjected to
electric field forces in opposite directions, the relative movement between the two kinds of particles is driven, the particle coagulation is changed from a passive process depending on slow Brownian
diffusion into a capture process dominated by an external electric field, and then the
collision frequency and
coagulation rate between submicron particles are improved.