Volume 12, No. 5, October 2012, Pages 673-682 PDF(3.09 MB)
Capture of Particles from an Iron and Steel Smelter with a Pulse-Energized Electrostatic Precipitator
Constantin Grigoriu1, Wei-Ning Wang2, Diana Martin1, Pratim Biswas2
1 Laser and Accelerator Department, National Institute of Laser, Plasma and Radiation Physics, Atomistilor 409, P.O. Box MG-36, 077125, Bucharest-Magurele, Romania
2 Aerosol and Air Quality Research Laboratory, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
A bench-scale pulse-energized electrostatic precipitator (ESP) was developed to study the capture of particles from exhaust gas streams from iron and steel factories. The morpho-structural characteristics, composition and size distribution of the particles were analyzed. The results showed that the particles consisted primarily of iron oxides and other compounds containing Ca, S, C, Si, Al, and Na elements. The particles had a broad size distribution ranging from 5 nm to several micrometers. The V-I characteristics of the ESP were studied with biased DC voltages of ± 10 kV and ± 10 kV with superimposed pulses (± 5.5 kV, rise time 60 ns, repetition rate 50 pps). The capture efficiency was investigated by means of a low pressure impactor and scanning mobility particle sizer. In the range of 155 to 6,650 nm, the ESP number-based capture efficiencies were > 99.6% and > 98.9% for negative and positive voltages, respectively. For sizes less than 50 nm, the negative pulsed mode was remarkably efficient (93.7 to 99.4%).
Air pollution; Aerosol sampling and transport; Condensation particle counter; Impactors; Nanoparticle measurement.