Hydration-induced reactivation of spent sorbents for fluidized bed calcium looping (double looping)
Hydration-induced reactivation of spent sorbents for fluidized bed calcium looping (double looping)
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DOI：
10.1016/j.fuproc.2013.12.004
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发表时间：
2014-04-01
影响因子：
7.5
通讯作者：
Scala, Fabrizio
中科院分区：
文献类型：
--
作者：
Coppola, Antonio;Salatino, Piero;Scala, Fabrizio
这项工作的目的是研究水化诱导的钙循环过程中的废吸附剂的再活化。考察了水合作用引起的吸附剂性能变化、CO2捕集能力的再生以及材料在循环中重复使用后的磨损趋势。为此，参考石灰石在实验室规模的流化床反应器中进行多次煅烧/碳酸化循环，然后在室温下通过水化再活化不同的时间。结果表明，所研究的吸附剂应水合的时间尽可能短，完全化学水合兼容。事实上，长的水化时间导致填塞（化学烧结）现象、活性孔隙率的较低增强、增加的磨损倾向和减少的再活化。对收到的和重新活化的吸附剂的吸附/碎片数据进行了比较。CO2捕集能力，表面性质和磨损趋势之间的关系，提出和批判性地讨论，考虑到也获得了不同的吸附剂的结果。(C)2013爱思唯尔有限公司版权所有。
The aim of this work was to study the hydration-induced reactivation of spent sorbents from a calcium looping process. The changes of the sorbent properties induced by hydration, the regeneration of the CO2 capture capacity and the attrition tendency of the material once reused in the looping cycle were investigated. To this end, a reference limestone was subjected to multiple calcination/carbonation cycles in a lab-scale fluidized bed reactor and then reactivated by water hydration at room temperature for different times. Results suggested that the sorbent under investigation should be hydrated for times as short as possible compatible with complete chemical hydration. In fact, long hydration times bring about cramming (chemical sintering) phenomena, lower enhancement in the active porosity, increased attrition tendency and reduced reactivation. Attrition/fragmentation data referring to as-received and reactivated sorbents were compared. Relationships among CO2 capture capacity, surface properties and attrition tendency were presented and critically discussed, taking into account also the results obtained for a different sorbent. (C) 2013 Elsevier B.V. All rights reserved.