Charged movement characteristics and enhanced removal of fine particles under the electric fields coupling with turbulence from industrial flue gas

Abstract

• The cross electrode can form an electric field with the larger impact area and higher electric field intensity. • The coupling effect of cross corona discharge and turbulence can prolong the particle residence time in the electric field. • The longer deviate distance from electrode can provide more opportunities for fine particles to collide and coagulate. Fine particulate matters emitted from the industrial flue gas are the primary reason for the serious haze problem. The agglomeration has been proven an effective method to improve fine particle removal efficiency, but the movement characteristics in the process and their effects on the agglomeration are unclear. In this study, the agglomeration and the underlying mechanisms in the various electric fields were investigated. The results showed that the removal efficiency of fine particles can reach near 80% under the coupling effect of turbulence and cross discharge electrode, and the particle size can be increased by 30% simultaneously. The electric field intensity with cross electrode approached 650,000 V/m and higher than another three conventional electrodes with 60,000–200,000 V/m. The residence time of fine particle was extended to 0.2 s in the electric field with cross electrodes, and the deviate distance from the discharge electrode was nearly 3 times than other electrodes. The longer residence time and the more disordered movements can make fine particles carry more charge amounts and have more opportunities to finish coagulations. This study discussed the charged particles movement characteristics under the electric fields coupling with turbulence, and explored the further effects on the agglomeration and removal of fine particles. It’s designed to provide the guidance for the setting and improvement of electric fields in the dust removal equipment.