Corona discharge ion sources for fine particle charging |
| |
Authors: | M Lackowski A Krupa and A Jaworek |
| |
Institution: | (1) Department of Environmental Engineering and Health, Yuanpei University, Hsinchu, 300, Taiwan, ROC;(2) National Center for Metallurgical Research (CSIC), 28040 Madrid, Spain |
| |
Abstract: | Charging of aerosol droplets and solid particles is applied in many
industrial processes such as electrostatic painting, particle separation and
electrostatic precipitation. In most of charging devices, electrical
discharges are used as a source of ions, which are deposited onto the
particles. In the present paper, the charging process by ionic current in
alternating electric field was optimized experimentally. Alternating
electric field charger was used as a charging device in these experiments.
The current voltage characteristics of electrical discharge in this device,
and the charge imparted to the particles were determined. The level of
charge was measured at the outlet of the charger and was compared to the
Pauthenier limit for different supply voltages, and frequencies. MgO powder
was used as a source of particles in these experiments. It was noticed that
higher supply voltage of the charger gives higher level of particle charge,
but at the same time, the particle deposition on the charger elements was
increased, decreasing the particle penetration. A compromise between these
two tendencies is therefore necessary. As a result we have proposed a
criterion maximizing the total charge born by the particles which is a
product of relative particle charge and particle penetration. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|