Main factors affecting the performance of electrostatic precipitators
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Dust removal efficiency is the main performance indicator of electrostatic precipitators. There are many factors that affect the performance of electrostatic precipitators, which can be roughly divided into dust properties, flue gas characteristics, structural factors, and operational factors. The influence of dust properties includes dust particle size distribution, adhesiveness, and electrical resistance. (1) Dust particle size distribution: Different particle sizes of dust result in different charging mechanisms in an electric field, as well as different driving speeds. For dust particles larger than the lcm, as the particle size decreases, the dust removal efficiency declines. For dust particles with a particle size of 0.1–1 μm, the dust removal efficiency is hardly affected by the particle size of the dust. (2) Adhesiveness of dust particles: The adhesiveness of dust particles has a significant impact on the operation of electrostatic precipitators. The adhesion force of dust mainly includes molecular attraction, capillary adhesion, and electrostatic Coulombic attraction. If the dust has strong adhesiveness, it will reduce the effectiveness of corona discharge; the dust cannot be sufficiently charged, which leads to a decrease in dust removal efficiency.
If the air flow velocity inside the dust collector is too high, the dust particles that have settled on the dust collection plates may detach from those plates and return to the airflow, resulting in secondary suspension of dust； During rapping for dust removal, dust particles that peel off from the electrodes may also be carried away by the high-speed airflow. Therefore, an excessively high air flow velocity will result in a reduced dust removal efficiency. Considering the equipment size, the gas velocity cannot be too low either; generally, a cross-sectional wind velocity of 0.6–1.5 m/s is appropriate. The uniformity of air flow distribution also has a significant impact on dust removal efficiency. If the air flow distribution is uneven, the increased dust removal efficiency in areas with lower flow speeds cannot compensate for the decrease in efficiency in areas with higher flow speeds, resulting in a decline in overall efficiency.
Wet electrostatic precipitators can effectively capture PM2.5 and SO3, and they can help address issues such as gypsum rain, blue smoke, and secondary particles; their effectiveness in reducing air pollution is widely recognized by industry experts.