Clean Technology 2010

Ion Characteristics and Electrostatic Removal of Ultrafine Particles in High Temperature CO2 Enriched Conditions

B. Han, H.-J. Kim, D.-K. Song, W.-S. Hong, W.-H. Shin, S.-H. Jeong, Y.-J. Kim
Korea Institute of Machninery and Materials, KR

Keywords: oxy-coal combustion, ESP, ion mobility, collection

Abstract:

Ion current and ion mobility have been investigated at different CO2 fractions and temperatures and electrostatic collection in a wire-plate electrostatic precipitator (ESP) has been also investigated and discussed based on ionic properties. Higher CO2 fraction led to lower ion mobility due to increase of mass of drift gas. Higher CO2 fraction resulted in lower corona current at a given applied voltage dominantly due to lower ion mobility. Influence of CO2 fraction on ion number concentration was not so significant compared to that of ion mobility. Higher collection efficiency was obtained with lower CO2 fraction and higher temperature due to higher ion mobility and thus higher particle charging probability at a given power consumption. Therefore, we found that ion mobility was a dominant factor to charge and collect ultrafine particles in ESPs at different CO2 fractions and temperatures. These data in this work will present useful information to properly design and operate ESPs in high CO2 enriched oxy-coal combustion.
 
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