期刊
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
卷 2, 期 2, 页码 203-209出版社
ELSEVIER SCI LTD
DOI: 10.1016/S1750-5836(07)00115-6
关键词
post-combustion capture; lime; solid sorbent; carbon dioxide; inventory
Lime is considered a feasible sorbent for the capture of CO2 from large stationary sources. The positive attributes of a natural source material, low cost and lack of harmful by-products are offset by rapid deterioration in performance and high regeneration temperature. Performance can be improved by hydrating the lime using steam. We investigate a steam hydration process wherein lime is hydrated for 5 min at 300 degrees C and atmospheric pressure in a mixture of steam and CO2. The experiments consisted of 10 capture cycles with 60% of the lime active at the end. Extrapolation using a decay model suggests a residual carbonation level of 48%, significantly higher than the 8% achieved by dry lime cycles. The cost of replacement sorbent under these conditions is less than $1/t of CO2 captured. The hydrated lime process also reduces the thermal load, for heating and cooling, by half as well as the inventory, and therefore solids handling, by a factor 5 over dry lime. The introduction of the hydration reaction provides another exothermic reaction for heat management. (c) 2007 Elsevier Ltd. All rights reserved.
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