AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
A Cylindrical Water-Film Electrostatic Precipitator to Remove Fine Particles or SO2/NO Gases
Bangwoo Han, Hak-Joon Kim, Dong-Keun Song, YONG-JIN KIM, Korea Institute of Machinery and Materials
Abstract Number: 59 Working Group: Control Technology
Abstract A cylindrical water film electrostatic precipitator (ESP) has been investigated for the treatment of fine particles or SO2 and NO gases. For removal of fine particles, D.C. high voltage of about 10-20 kV was applied to the wire-cylinder ESP and for SO2 and NO gases, pulse high voltage of 30-40 kV with a rising time of 100 ns was applied to the same ESP. Inner wall of the ESP was uniformly coated with TiO2 nanoparticles with an average size of 15 nm. Ammonia and propylene gases were added into the ESP as additives for the treatment of SO2 and NO gases. Uniform water film with a water supply of about 3.0 l/min/m2 was successfully achieved at the inner wall of the ESP. Corona discharging characteristics such as voltage-current curves between the ESPs with and without water film were almost the same. This indicated that water film did not influence on the corona discharge phenomenon in the ESP due to uniformly formed thin water layer on the wall of the ESP. Particle collection efficiencies at different applied voltages to the ESP were also almost the same between ESPs with and without water film. Gas decomposition efficiencies for SO2 and NO between the ESPs with and without water film were also almost the same for both SO2 and NO. During dust loading, particle collection efficiency gradually decreased with time owing to a lower electric field between polluted electrodes of the ESP. This was completely avoided by forming a thin water film on the collection electrode in the ESP. It is expected that our water-film ESP will be a highly durable system for the treatment of fine particles and/or SO2 and NO emission gases.