Numerical Study on the Flow Field Characteristics and Dust Removal Efficiency of Tubular Electrofiltration Equipment

Tube electrofiltration equipment is mainly used to remove fine particles from exhaust gases and separate them from the emission source. In this paper, we study the flow field characteristics and dust removal efficiency of tubular electrofiltration equipment through numerical simulation. The multi-field coupling model of tubular electrofiltration equipment can be used to investigate the internal ion wind (EHD flow) of tubular electrofiltration equipment and its impact on dust removal efficiency. Furthermore, this approach can also be used to evaluate the particle motion trajectory and its impact on dust removal efficiency in tubular electrofiltration equipment under different particle sizes, air flow velocities, and discharge voltages. The results demonstrate that increasing the airflow rate gradually decreases the influence of EHD flow on the airflow field, the removal effect of particles with size < 6 μm by the EHD flow becomes concealed, and the influence on the overall dedusting efficiency becomes negligible. When the particle size dp and discharge voltage U are increased, the charge elevates and the electric field force strengthens, resulting in particles being guided towards the dust collection electrode and increasing the offset, thus improving the dust removal efficiency. When the gas flow rate u is increased, the offset of particles decreases and the dust removal efficiency declines. The optimal operating conditions for the tubular electrofiltration equipment are U = 45 kV, u = 0.5 m/s, and dp ≥ 6 μm.