Temperature Swing Adsorption for the Recovery of the Heavy Component: An Equilibrium-Based Shortcut Model
Temperature Swing Adsorption for the Recovery of the Heavy Component: An Equilibrium-Based Shortcut Model
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DOI：
10.1021/ie5048829
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发表时间：
2015-03-25
影响因子：
4.2
通讯作者：
Mazzotti, Marco
中科院分区：
文献类型：
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作者：
Joss, Lisa;Gazzani, Matteo;Mazzotti, Marco
变温吸附 (TSA) 工艺被认为是从烟气中捕获 CO 的一个有趣的选择。在这项工作中，开发了一个四步循环的快捷模型，旨在从二元混合物中以高纯度回收更多保留的组分，例如来自 CO2/N-2 的 CO2。该模型方程假设局部吸附平衡，但考虑传热动力学，可以直接半解析解循环稳态。对于间接加热和冷却流体的固定温度，间隙速度；和进料成分，剩余的操作条件可以减少到循环期间达到的高温和低温水平；它控制定义有效循环容量的热力学状态。该模型用于研究 TSA 对商业沸石吸附剂的 CO2/N2 分离。通过对相关量（即纯度、回收率、比热能消耗和生产率）的操作条件进行参数分析，可以揭示重要趋势。最佳操作条件位于可行操作条件范围内，并提出并讨论了生产率和特定能耗之间的权衡。除了深入了解 TSA 重组分回收流程外，该工具还可用于快速而稳健的吸附剂筛选。
Temperature swing adsorption (TSA) processes are considered as an interesting option for the capture of CO, from flue gases. In this work, a shortcut model is developed for a four step cycle aimed at recovering the more retained component at high purity from a binary mixture, e.g. CO2 from CO2/N-2. The model equations, which assume local adsorption equilibrium but take into account heat transfer kinetics, enable a direct semianalytical solution of the cyclic steady state. For fixed temperatures of the indirect heating and cooling fluid, interstitial velocity; and feed composition, the remaining operating conditions can be reduced' to, the high and low temperature levels achieved during the cycle; which control the thermodynamic states defining the effective cyclic capacity. This model is used to investigate the CO2/N2 separation by TSA oft a commercial zeolitic adsorbent. Important trends are revealed by performing a parametric analysis of the operating conditions on the relevant quantities, that is, purity, recovery, specific thermal energy consumption, and productivity. Optimal operating conditions are localized within the region of feasible operating conditions and a trade-off between productivity and specific energy consumption is presented and discussed'. Besides providing insight into TSA processes for the recovery of the heavy component, this tool could be used for rapid yet robust sorbent screening.