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A Study on Hybrid DeNOx Process Using Selective Catalytic Reduction and Adsorption  

Moon, Seung-Hyun (Green House Gas Research Center, Korea Institute of Energy Research)
Jeon, Dong-Hwan (Green House Gas Research Center, Korea Institute of Energy Research)
Park, Sung-Youl (Green House Gas Research Center, Korea Institute of Energy Research)
Publication Information
Journal of Korean Society of Environmental Engineers / v.29, no.12, 2007 , pp. 1329-1336 More about this Journal
Abstract
This study was carried out to develop an efficient process abating high NO concentration. A hybrid process of selective catalytic reduction(SCR) and activated carbon fiber(ACF) adsorption was newly designed and tested. Used ACF in NO adsorption was regenerated by simultaneously applying heat and vacuum. The result of ACF regeneration was for superior in the desorption condition at $140^{\circ}C$ and vacuum 600 mmHg. A commercial catalyst was used at the conditions of reaction temperature at $300^{\circ}C$, $NH_3/NO$ mole ratio = 1.0 for SCR process. NO evolved from ACF regeneration reactor could be removed by SCR reactor up to 98%. But high concentration of NO was exhausted from SCR reactor for one minute when the flue gas of NO 300 ppm and deserted NO from ACF regeneration were simultaneously treated by the same SCR reactor. Therefore, it is necessary to use additional small sized SCR reactor or to increase $NH_3$ concentration for a short time along with NO concentration rather than to mix flue gas with the gas evolving from ACF regeneration at fixed $NH_3$ inlet concentration. The hybrid process of SCR and ACF showed high NO removal efficiency over 80% at any time courses. Through the repeated cycles, stable DeNOx efficiency was maintained, indicating that the hybrid process would be a good countermeasure to the spotaneously high NO concentration instead of increasing the SCR capacity.
Keywords
NOx; SCR; ACF; Adsorption; Desorption;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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