The effect of dehydration temperatures on the performance of the CaO/Ca(OH)(2) thermochemical heat storage system
The effect of dehydration temperatures on the performance of the CaO/Ca(OH)(2) thermochemical heat storage system
复制标题
脱水温度对CaO/Ca(OH)(2)热化学储热系统性能的影响
DOI：
10.1016/j.energy.2019.07.167
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发表时间：
2019
期刊：
影响因子：
9
通讯作者：
Wang T.
中科院分区：
文献类型：
--
作者：
Yan J.;Zhao C. Y.;Xia B. Q.;Wang T.
对氢氧化钙材料的脱水和水化过程有一个更基本的了解，这对于正确设计和操作热化学储热系统是非常重要的。目前还没有一种简单有效的方法来解决储热过程的速度和CO2对Ca(OH)2材料的影响问题。动力学研究证明，高温可以提高材料的储存速度，但高温会加剧材料的烧结。高温也可以解决与二氧化碳接触形成碳酸盐的问题。因此，如何解决单一高温脱水后材料烧结性加剧的问题就显得尤为重要。在本研究中发现，如果在下一个循环中采用较低的温度进行蓄热，则材料的放热能力可以恢复。动力学研究无法解释这些过程的原因。为此，采用氮气吸附-脱附和扫描电子显微镜等手段研究了不同脱水温度对材料微观结构的影响。结果表明，微孔结构的变化是导致上述过程的原因。
A more fundamental understanding of the dehydration and hydration processes of Ca(OH)2materials is very important for the proper design and operation of thermochemical heat storage systems. There is no simple and effective method which can solve the issues of the rate of the heat storage process and the influence of CO2on Ca(OH)2materials. Kinetic studies have proven that a high temperature can increase the storage speed, but a high temperature will aggravate sintering of the material. The problem of carbonate formation due to contact with CO2can also be solved by a high temperature. Therefore, how to solve the problem of the aggravation of sintering of the material after a single high temperature dehydration is important. In this study, it was found that the heat release ability can be recovered if the heat storage process of the material is applied at a lower temperature in the next cycle. Kinetic studies cannot explain the reasons of these processes. Therefore, the methods of N2adsorption–desorption and SEM were used to reveal the effects of different dehydration temperatures on the microstructure of the materials. The results showed that the change of the micro-pore structure was the reason for the above processes.