Numerical study on staggered needle-plate electrode configuration for improved particulate matter collection in electrostatic precipitator.

The electrostatic precipitator (ESP) utilizes corona discharge to effectively separate particles from polluted air. The arrangement of electrode is a crucial role in achieving higher efficiency. Needle discharge electrodes can generate concentrated corona discharge at lower applied voltages. In this study, a staggered needle-plate electrode configuration was presented to expand the domain for particle charging, and thereby improve collection efficiency. A three-dimensional model was established to describe the multi-physics phenomenon in the ESP. The ion charge distribution, electric field, and particle collection efficiency were investigated under various conditions. The staggered model showed an average ion charge density that was 20% higher than that of the aligned arrangement. Particles introduced via staggered model acquired higher charge and showed improved collection efficiency across inflow velocities of 0.5 to 1.5 m/s and particle diameters of 0.1 to 50 μm. In the staggered model, particles predominantly escaped near the sidewall of the ESP. [Display omitted] • A 3-D CFD method was used to simulate Corona discharge and particle charging. • The effects of electrode configuration on particle transport and deposition characteristics were analyzed. • The staggered configuration provided more pervasive dispersion of ion charge. • Particle collection processes were investigated under various conditions. [ABSTRACT FROM AUTHOR]