Dehydration kinetic study of a chemical heat storage material with lithium bromide for a magnesium oxide/water chemical heat pump
Dehydration kinetic study of a chemical heat storage material with lithium bromide for a magnesium oxide/water chemical heat pump
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DOI：
10.1016/j.pnucene.2014.07.026
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发表时间：
2015-07-01
影响因子：
2.7
通讯作者：
Kato, Yukitaka
中科院分区：
文献类型：
--
作者：
Myagmarjav, Odtsetseg;Ryu, Junichi;Kato, Yukitaka
研究了一种新型化学蓄热复合材料在氧化镁/水化学热泵中的反应性能。这种复合材料被称为EML，由纯Mg（OH）（2）粉末和支撑材料组成，包括LiBr和膨胀石墨，以分别提高反应性和传热性。采用热重分析法对不同LiBr/Mg（OH）（2）摩尔比a下的脱水和水化过程进行了实验研究，评价了EML复合材料的储热和放热性能。EML复合材料的储热和热输出能力随a的增加而增加。α = 0.100的EML复合材料在30 min后估计能够储存纯Mg（OH）（2）粉末中储存的热量的1.3倍。基于这些评估，EML复合材料表现出足够的热储存、热输出能力和良好的模塑性，用于热交换反应器中的实际使用。因此，EML复合材料被确认为用于化学热泵的候选材料。因此，潜在的使用EML复合材料的氧化镁/水化学热泵耦合与小型核反应堆区域供热系统的基础上的实验结果进行了评估。(C)2014爱思唯尔有限公司版权所有。
The reaction performance of a novel chemical heat storage composite as thermal energy storage medium were evaluated for use in a magnesium oxide/water chemical heat pump. The composite, called EML, is composed of pure Mg(OH)(2) powder and support materials, including LiBr and expanded graphite to improve reactivity and heat transfer, respectively. The heat storage and heat output capacities of the EML composites were evaluated based on laboratory experiments of dehydration and hydration processes for various molar mixing ratios a of LiBr to Mg(OH)(2) using the thermogravimetric method. The heat storage and heat output capacity of the EML composites increased with increasing a. The EML composite with alpha = 0.100 was estimated to be able to store 1.3 times the heat stored in pure Mg(OH)(2) powder after 30 min. Based on these evaluations, the EML composites exhibited sufficient heat storage, heat output capacity, and good mold-ability for practical use in a heat exchange reactor. The EML composite was accordingly confirmed as a candidate material for use in chemical heat pumps. Thus, potential use of the EML composite in a magnesium oxide/water chemical heat pump coupled with a small nuclear reactor for district heating systems was evaluated based on the experimental results. (C) 2014 Elsevier Ltd. All rights reserved.