Effect of steam hydration on performance of lime sorbent for CO2 capture |
| |
Authors: | Frank Zeman |
| |
Affiliation: | aEarth & Environmental Engineering, Columbia University, 918 Mudd MC 4711, 500 West 120th Street, New York, NY 10027, United States |
| |
Abstract: | 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 °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. |
| |
Keywords: | Post-combustion capture Lime Solid sorbent Carbon dioxide Inventory |
本文献已被 ScienceDirect 等数据库收录! |
|