Development of dry lime injection scrubbing system for combined removal of SO{sub x}/NO{sub x}
In order to remove both the acidic gases and the particulates emitted from power plants, incinerators, or other industrial processes, a novel dry lime injection scrubbing system has been constructed in Hankuk University of Foreign Studies, Seoul, Korea and is still under investigation. The dry lime injection scrubbing system consists of a circulating fluidized bed absorber(CFBA) and a bagfilter. As the flue gas with temperature of 150 {approximately} 200 C entered the CFBA, both SO{sub x} and NO{sub x} in the flue gas are captured by hydrated limes(Ca(OH){sub 2}) and additives which are continuously injected into a CFBA. Parts of the unreacted limes are elutriated from the bed reactor and collected by a cyclone or a bagfilter. The limes captured by a cyclone are re-injected into a CFBA for an increase of their utilization. The lime collected on a bagfilter can also be utilized for further chemical reactions with acid gases, resulting the enhancement of the overall removal efficiency of the dry sorbent scrubbing system. The experimental results showed that the overall removal efficiency of SO{sub 2} was greater than 80% under an optimized water injection condition (4.5 ml/min) and Ca/S molar ratio from 1.5 to 2, and the maximum removal efficiency of NO was about 35% without additives. However, a dramatically increased removal efficiency of SO{sub 2}/NO was observed with additives injection into the system. The overall removal efficiency of SO{sub 2} and NO in the dry lime scrubbing system was 97% and 78%, respectively, under additives and lime injection.
- Research Organization:
- Hankuk Univ. of Foreign Studies, Yongin City (KR)
- OSTI ID:
- 20002174
- Report Number(s):
- CONF-990608-; TRN: IM200002%%174
- Resource Relation:
- Conference: Air and Waste 92nd Annual Meeting and Exhibition, St. Louis, MO (US), 06/20/1999--06/24/1999; Other Information: 1 CD-ROM. Operating Systems: Windows 3.1, '95, '98 and NT; Macintosh; and UNIX; PBD: 1999; Related Information: In: Air and Waste 92nd annual meeting and exhibition proceedings, [9500] pages.
- Country of Publication:
- United States
- Language:
- English
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