Efficient hydrogen storage in up-scale metal hydride tanks as possible metal hydride compression agents equipped with aluminium extended surfaces
Efficient hydrogen storage in up-scale metal hydride tanks as possible metal hydride compression agents equipped with aluminium extended surfaces
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DOI：
10.1016/j.ijhydene.2016.04.035
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发表时间：
2016-07-06
影响因子：
7.2
通讯作者：
Walker, Gavin S.
中科院分区：
文献类型：
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作者：
Gkanas, Evangelos I.;Grant, David M.;Walker, Gavin S.
本文对大型圆柱形金属氢化物反应器加氢和脱氢过程中的热质耦合传递进行了三维计算研究，并对其进行了分析和优化。我们考察了三种不同的热管理方案，分析了它们在多大程度上提高了系统性能。这三种方案分别是：1)平埋式制冷/加热管，2)横向翅片管和3)纵向翅片管。进行了详细的优化研究，选择了优化后的几何形状。此外，还研究了两种不同类型的氢化物LaNi5和AB(2)型金属间化合物作为两级金属氢化物压缩系统第一级合金的可能候选材料。结果表明，当同时使用LaNi5和AB(2)合金作为氢化物试剂时，采用配备16根纵向翅片管的容器是提高加氢动力学的最有效方法。当使用LaNi5作为操作氢化物时，装有60根埋管的容器表现出与装有12根纵向翅片管的容器相同的动力学行为，因此，通过使用扩展表面来加强换热，可以将总管数从60个减少到12个。对于使用AB(2)型材料作为操作氢化物的情况，扩展表面的性能比使用埋管的情况更明显和有效，特别是对于纵向扩展表面的情况。(C)2016年氢能源出版有限责任公司。爱思唯尔有限公司出版。保留所有权利。
In the current work, a three-dimensional computational study regarding coupled heat and mass transfer during both the hydrogenation and dehydrogenation process in up-scale cylindrical metal hydride reactors is presented, analysed and optimized. Three different heat management scenarios were examined at the degree to which they provide improved system performance. The three scenarios were: 1) plain embedded cooling/heating tubes, 2) transverse finned tubes and 3) longitudinal finned tubes. A detailed optimization study was presented leading to the selection of the optimized geometries. In addition, two different types of hydrides, LaNi5 and an AB(2)-type intermetallic were studied as possible candidate materials for using as the first stage alloys in a two-stage metal hydride hydrogen compression system. As extracted from the above results, it is clear that the case of using a vessel equipped with 16 longitudinal finned tubes is the most efficient way to enhance the hydrogenation kinetics when using both LaNi5 and the AB(2)-alloy as the hydride agents. When using LaNi5 as the operating hydride the case of the vessel equipped with 60 embedded cooling tubes presents the same kinetic behaviour with the case of the vessel equipped with 12 longitudinal finned tubes, so in that way, by using extended surfaces to enhance the heat exchange can reduce the total number of tubes from 60 to 12. For the case of using the AB(2)-type material as the operating hydride the performance of the extended surfaces is more dominant and effective compared to the case of using the embedded tubes, especially for the case of the longitudinal extended surfaces. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.