Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 40, Issue 39, Pages 13490-13505Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.08.066
Keywords
Metal hydride; Reactor; Heat transfer; Spiral tube; Hydrogen; Absorption
Categories
Funding
- National Natural Science Foundation of China [21276209]
- Major Technological Innovation Projects of Shaanxi Province [2012ZKC03-1]
- Nature Science Funding of Shaanxi Province [2015JM5188]
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The metal hydrides have great potential for the storage and utilization of hydrogen. Because of the strong exothermic/endothermic effect of H-2 absorption/desorption process, the structure development of metal hydride reactor should mainly focus on the heat transfer enhancement. The new spiral mini-channel reactor is proposed to increase the heat transfer efficiency and H-2 absorption rate. The spiral tubes can not only eliminate the stress produced by temperature changes and volumetric expansions, but also improve the turbulent intensity and heat transfer rate. The numerical model of spiral mini-channel reactor is established, and the simulation results present that the new reactor shows high thermal efficiency and hydrogenation rate. The structure parameters of the reactor are optimized as minor radius of 2.2 mm, axial pitch of 5 mm, major radius of 5.5 mm and tube amount of 3. Furthermore, the operation conditions are investigated. The result indicates that superior performance is obtained for the packing fraction of 0.6 and H-2 pressure over 10 atm during H-2 absorption. With these promising features, this new spiral mini-channel reactor has broad prospects in the hydrogen energy field. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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