For particles that
escape from electrostatic precipitators (ESPs),
inertial recapture is used to improve the efficiency of dust removal.
A rod-grid inertial separator was designed. The electrostatic and
fluid flow particle tracking modules were selected in the model established
by the COMSOL software, and the dust removal efficiency of the proposed
dust separator was evaluated. When the flue gas velocity was 20 m·s
–1
, the diameter of the round rod was 8 mm, and the
spacing of the pipes was 15 mm, the removal efficiency of PM2.5 and
PM10 reached 27.8 and 84.6%, respectively. Experiments were performed
under laboratory conditions and actual working conditions in a coal-fired
power plant flue. Results showed that an inertial separator can achieve
more than 60% efficiency in recapturing fly ashes that have escaped
from ESPs. It can effectively remove fine particles and aerosol pollutants
represented by PM2.5 and PM10.