Effect of steam hydration on performance of lime sorbent for CO2 capture
Effect of steam hydration on performance of lime sorbent for CO2 capture
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DOI：
10.1016/s1750-5836(07)00115-6
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发表时间：
2008-04
影响因子：
3.9
通讯作者：
F. Zeman
中科院分区：
文献类型：
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作者：
F. Zeman
石灰被认为是一种可行的吸附剂，用于捕获来自大型固定源的CO2。天然原料、低成本和无有害副产物的优点被性能的快速劣化和高再生温度所抵消。性能可以通过使用蒸汽使石灰水化来改善。我们研究了蒸汽水合过程，其中石灰在300°C和大气压下在蒸汽和CO2的混合物中水合5分钟。实验由10个捕获循环组成，其中60%的石灰在结束时具有活性。使用衰减模型的外推法表明残余碳酸化水平为48%，显著高于干石灰循环实现的8%。在这些条件下，替代吸附剂的成本低于1美元/吨CO2捕获。熟石灰工艺还将用于加热和冷却的热负荷减少了一半，并将库存减少了一半，因此固体处理量比干石灰减少了5倍。水合反应的引入为热管理提供了另一种放热反应。
Lime is considered a feasible sorbent for the capture of CO2from 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 5min 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 CO2captured. 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.