Effect of sorbent hydration on the average activity of CaO in a Ca-looping system
Effect of sorbent hydration on the average activity of CaO in a Ca-looping system
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DOI：
10.1016/j.cej.2010.08.009
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发表时间：
2010-10
影响因子：
15.1
通讯作者：
B. Arias;G. Grasa;J. C. Abanades
中科院分区：
文献类型：
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作者：
B. Arias;G. Grasa;J. C. Abanades
众所周知，钙循环二氧化碳捕集系统中使用的固体吸附剂的承载能力随着循环次数的增加而降低。为了克服这种失活过程，已经提出了几种脱硫剂再活化方案。这项工作分析了利用水化反应器在钙环循环中重新激活过程的整合。为了评估不同变量对脱硫剂平均活性的影响，必须解决这三个反应器系统中的质量平衡问题。结合对系统整体运行的负面影响(例如，蒸汽消耗等)，讨论了通过水化重新激活的积极影响(即到达碳化器的脱硫剂活性的平均增加)。以及大型再活化反应堆上。评估了采用不同水化程度的两种不同方案。结果表明，当循环固体中只有一小部分被高度水化时，蒸汽的利用效率更高。此外，当使用低组成流量的石灰石时，脱硫剂再活化步骤的性能更好。
It is well known that the solid sorbents used in calcium looping CO2capture systems experience a reduction in carrying capacity with the number of cycles. Several sorbent reactivation schemes have been proposed as means of overcoming this deactivation process. This work analyzes the integration of a reactivation process in a Ca-looping cycle by means of a hydration reactor. The mass balances involved in this three-reactor systems must then be solved in order to evaluate the effect of the different variables on the average activity of the sorbent. The positive impact of reactivation by hydration (i.e. average increase in activity of the sorbent arriving at the carbonator) is discussed in conjunction with the negative impacts on the overall operation of the system (e.g. steam consumption, etc.) and on the large reactivation reactors. Two different scenarios employing different degrees of hydration have been evaluated. The results obtained show that steam is used more efficiently when only a small fraction of the circulating solids is hydrated to a high degree. Moreover, the performance of the sorbent reactivation step is better when low make up flows of limestone are used.