AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
The Electrical and Particle Removal Performance of Dry and Wet Electrostatic Precipitators at a 0.7 MW-Oxygen Pulverized Coal Combustion Pilot Plant
Hak-Joon Kim, Bangwoo Han, YONG-JIN KIM, Sang-In Keel, Jin-Han Yun, Tae-Hyung Kim, Jung-Hee Hong, Korea Institute of Machinery and Materials
Abstract Number: 293 Working Group: Control Technology
Abstract The electrical and particle removal performance of dry and wet electrostatic precipitators were evaluated at a 0.7 MW-oxygen pulverized coal combustion (Oxy-PC) pilot plant in Daejeon, Republic of Korea. For the gas cleaning of the pilot plant, in-furnace deSOx method was used, spraying limestones directly into the furnace with a normalized stoichiometric ratio (NSR) of 2.0. The particle removal system for the pilot plant was composed of a dry ESP which cleaned whole volume of total flue gas and a wet ESP which cleaned 40% of the total gas, while 60% of the gas recycled into the boiler. The dry ESP with rigid-edge type electrodes and rectangular type collection plates developed by the KC Cottrell and the wet ESP with rigid-edge electrodes and water-film collection plates developed by the KIMM were used. The experiments showed that corona current under a given applied voltage at the oxy-PC combustion with the in-furnace deSOx was lower than that at air-PC combustion without the in-furnace deSOx. Mass concentration during Oxy-PC combustion with the deSOx method of the NSR of 2.0 was 2.5 times larger than that during air-PC combustion, and particle size distribution based on mass during air-firing mode was bi-modal (0.8 and 2.7 micro-meter), while that during oxy-PC mode was tri-modal (0.8, 1.94, and 13.35 micro-meter). The total collection efficiency with the dry and wet ESPs was 99.9%, while the efficiency only with dry ESP was 98.95%. It can be concluded that the usage of both dry and wet ESPs with water film collection plates could guarantee almost zero-emission less 1 milligram per cubic meter of particles for the CCS (Carbon Capture and Storage) facilities of the Oxy-PC combustion.