Coupled CO2 capture and thermochemical heat storage of CaO derived from calcium acetate
Coupled CO2 capture and thermochemical heat storage of CaO derived from calcium acetate
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耦合 CO2 捕获和源自醋酸钙的 CaO 热化学储热
DOI：
10.1002/ghg.2021
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Wang Tao
中科院分区：
文献类型：
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作者：
Sun Chaoying;Yan Xianyao;Li Yingjie;Zhao Jianli;Wang Zeyan;Wang Tao
CaO/Ca(OH)2热化学储热(THS)技术被认为是大规模太阳能存储最有前途的技术之一。然而，CaO 基原材料的 THS 性能在多次循环过程中会下降。在这项工作中，制备了源自乙酸钙 (Ac-CaO) 的 CaO，并将其应用于耦合系统，实现了 CaO/Ca(OH)2THS 和 CO2 的同时捕获。由于其良好的孔隙结构，Ac-CaO 的 CO2 捕集和 THS 性能始终高于煅烧石灰石，而 Ac-CaO 的 CO2 捕集和 THS 性能则因在空气冷却过程中烧结以及 CaO 或 Ca(OH)2 与环境 CO2 形成 CaCO3 而分别表现出下降。在耦合的 CaO/Ca(OH)2THS 和 CO2 捕获系统中，Ac-CaO 依次经历 10 个 CO2 捕获循环、30 个 THS 循环、1 个 CO2 捕获循环、10 个 THS 循环、1 个 CO2 捕获循环和 10 个 THS 循环。由于CaCO3在煅烧过程中分解，Ac-CaO在第31次THS循环中的水合和脱水转化率分别达到91.7%和93.6%，分别比第11次CO2捕获循环之前记录的水合和脱水转化率高1.6和1.6倍。 Ac-CaO 的碳酸化转化率在第 11 个 CO2 捕获循环中达到 89.9%，比第 10 个 THS 循环之前记录的转化率高 22.3%，这是由于 THS 期间水合过程的重新激活。使用 Ac-CaO 的耦合系统增强了 CO2 捕获和 CaO/Ca(OH)2THS 过程；因此，耦合系统对于 CaO/Ca(OH)2THS 和 CO2 捕获似乎很有前景。 © 2020 化学工业协会和 John Wiley & Sons, Ltd.
CaO/Ca(OH)2thermochemical heat storage (THS) technology is considered to be one of the most promising technologies for large‐scale solar energy storage. However, the THS performance of raw CaO‐based materials decreases during multiple cycles. In this work, CaO derived from calcium acetate (Ac‐CaO) is prepared and applied to a coupled system that achieved simultaneous CaO/Ca(OH)2THS and CO2capture. The CO2capture and THS performances of Ac‐CaO are always higher than those of calcined limestone owing to the preferable pore structure, whereas Ac‐CaO exhibits decreasing CO2capture and THS performance resulting from sintering and the formation of CaCO3from CaO or Ca(OH)2with ambient CO2during air cooling, respectively. In the coupled CaO/Ca(OH)2THS and CO2capture system, Ac‐CaO is subjected to 10 CO2capture cycles, 30 THS cycles, 1 CO2capture cycle, 10 THS cycles, 1 CO2capture cycle, and 10 THS cycles sequentially. The hydration and dehydration conversions of Ac‐CaO in the 31st THS cycle reach 91.7 and 93.6%, respectively, which are 1.6 and 1.6 times higher than those recorded prior to the 11th CO2capture cycle owing to the decomposition of CaCO3during calcination. The carbonation conversion of Ac‐CaO achieves 89.9% in the 11th CO2capture cycle, which is 22.3% higher than that recorded prior to the 10 THS cycles owing to reactivation from the hydration process during THS. The CO2capture and CaO/Ca(OH)2THS processes are enhanced in the coupled system using Ac‐CaO; therefore, the coupled system appears promising for CaO/Ca(OH)2THS and CO2capture. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.