Circulating fluidized bed temperature swing adsorption (CFB-TSA) CO capture process using solid amine sorbents has become a widely recognized solution to reduce stationary sources CO emissions. The successful design and operation of the adsorber and desorber requires much information on the CO adsorption and desorption behaviors of the sorbents in fluidized bed reactors. However, among the existing studies, little attention has been paid to desorption performance, which is equally important as adsorption performance. And almost all of them were conducted in TGAs or fixed beds, the lack of research in fluidized beds making it difficult to guide the design of industrial fluidized bed reactors. In addition, the systematic comparison of the above-mentioned adsorption/desorption behaviors and bed hydrodynamics (e.g. pressure drops) in fixed and fluidized beds can help provide theoretical support for the optimization of adsorbers, desorbers and coolers, which has not been reported yet. Therefore, we for the first time investigated the CO adsorption/desorption behaviors as well as hydrodynamics in both fluidized and fixed beds using a solid amine sorbent in a temperature swing adsorption (TSA) experimental rig. The results show that the sorbent exhibits faster adsorption and desorption kinetics in fluidized beds than those in fixed beds, as reflected by the fitted parameters of the Avrami kinetic model and the change of bed temperature during adsorption and desorption tests. And the bed pressure drops in fluidized beds are also much lower than that in fixed beds, especially at high superficial gas velocities and high sorbent loadings. By further discussion, a fluidized bed can also achieve lower equipment investment and less sorbent loading compared to multiple fixed beds in parallel. This study demonstrates the advantages of fluidized beds over fixed beds in large-scale TSA units in view of higher reactor efficiency, lower energy consumption and equipment investment.

中文翻译：

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探讨固定床和流化床中固体胺吸附剂 CO2 吸附/解吸行为的差异

使用固体胺吸附剂的循环流化床变温吸附 (CFB-TSA) CO 捕集工艺已成为广泛认可的减少固定源 CO 排放的解决方案。吸附器和解吸器的成功设计和运行需要有关流化床反应器中吸附剂的 CO 吸附和解吸行为的大量信息。然而，现有研究中很少关注与吸附性能同等重要的解吸性能。而且几乎全部都是在TGA或固定床中进行，流化床研究的缺乏使得难以指导工业流化床反应器的设计。此外，系统比较固定床和流化床中上述吸附/解吸行为和床层流体动力学（如压降）有助于为吸附器、解吸器和冷却器的优化提供理论支持，目前尚未见报道。因此，我们首次在变温吸附（TSA）实验装置中使用固体胺吸附剂研究了流化床和固定床中的CO吸附/解吸行为以及流体动力学。结果表明，吸附剂在流化床中比在固定床中表现出更快的吸附和解吸动力学，这从Avrami动力学模型的拟合参数以及吸附和解吸测试中床温的变化反映出来。流化床的床压降也比固定床低得多，特别是在高表观气速和高吸附剂负载量的情况下。通过进一步讨论，与并联的多个固定床相比，流化床还可以实现更低的设备投资和更少的吸附剂负载。本研究证明了在大型 TSA 装置中流化床相对于固定床的优势在于反应器效率更高、能耗更低、设备投资更低。