期刊
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
卷 5, 期 6, 页码 1596-1605出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2011.09.006
关键词
Post-combustion; Chilled-ammonia; Carbon capture and sequestration
类别
资金
- U.S. Department of Energy's National Energy's Technology Laboratory (DOE/NETL) [24905.913.ER.1041723]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Divn Of Social and Economic Sciences
- Direct For Social, Behav & Economic Scie [949710] Funding Source: National Science Foundation
An ammonia-based post-combustion CO2 capture system processing flue gas from a supercritical coal-fired power plant was modeled, and its estimated performance and cost were compared to an amine-based capture system. For the ammonia system the absorber CO2 capture efficiency, NH3 slip, and solids precipitation were evaluated for changes in lean solution NH3 concentration, NH3/CO2 ratio, and absorber temperature. Reductions in NH3 slip were also assessed for changes in absorber temperature and water wash flow rate. For 90% CO2 capture the levelized cost of electricity generation (annual revenue requirement) for the plant with ammonia-based capture was estimated at $US 105/MWh, which is comparable to the levelized cost of electricity generation for the plant with an amine-based capture system. The cost of the ammonia-based system was found to depend strongly on the fraction of CO2 captured as well as on key process design parameters such as lean solution NH3 concentration. Uncertainties in system performance and cost also were estimated probabistically. Assumptions about plant financing and utilization, as well as uncertainties in cooling costs and reaction rates that affect absorber cost were found in particular to produce a wide range of cost estimates for ammonia-based CO2 capture systems, and as a result the importance of reducing these uncertainties is emphasized. (C) 2011 Elsevier Ltd. All rights reserved.
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