Enhanced particle precipitation from flue gas containing ultrafine particles through precharging

摘要: Abstract The collection performance of wet electrostatic precipitators (ESPs) considerably deteriorates in the presence ultrafine particles, which confer difficulties realizing ultra-low emission particulate matter (PM). In this work, use a ESP combined with perforated precharger was proposed to investigate its electrical and characteristics flue gas containing particles compared these those common ESP. Results indicated that distributions ion density electric field were affected by particle loadings. With increased PM0.1 concentration from 0 mg/m3 100 mg/m3, average decreased more than two orders magnitude. Meanwhile, charging transport deteriorated, even for large (10 μm), migration velocity sharply 85 %. corona significantly improved installing precharger. can be operated well under problematic conditions. Additional electrons generated discharge precharger, contributed subsequent capture. When applied voltage exceeded 15 kV, precipitation 1 μm only slightly weakened 40 capture >5 μm-diameter nearly unaffected particles.