Simulation of hydrogen storage performance in solid-state hydrogen storage reactor based on optimal arrangement of heat exchange tube bundles
To explore the heat and mass transfer process in a solid-state hydrogen storage reactor,a two-dimensional numerical calculation model for the reactor is developed.The radial reaction rate distribution characteristics of the solid-state hydrogen storage material within the reactor is investigated,and the influence laws of bed thickness of the hydrogen storage material and diameter of the heat exchange tube on saturation radius are also studied.Based on this,the arrangement of the heat exchange tube bundle is optimized.The results show that,the heat exchange tube has the corresponding maximum saturation radius,and it increases with the tube radius.When the tube radius is 1.00～6.00 mm with single-tube arrangement,the maximum saturation radius is 2.60,3.30,3.50,3.70,3.80 and 3.90 mm,respectively.The volume fraction of heat exchange tubes with radius of 1.00,2.00 and 3.00 mm is relatively small,which is 7.72%,14.24%and 21.30%.The optimal bed thickness between tubes is 4.86,6.09 and 6.38 mm when arranging the above three types of tubes in a tube bundle.Moreover,adding heat exchange tube bundles can effectively improve the hydrogen storage performance of reaction dead zone in the reactor.In the reactor equipped with heat exchange tube bundles with radius of 2.00 mm,adding 12 heat exchange tubes with radius of 2.00 mm in the reaction deadzone can reduce the hydrogen storage time to 267 s(by 40.00%),while the volume fraction of tube bundle only increases by 1.92%,and the hydrogen storage capacity just decreases by 2.17%.The research findings can establish a fundamental basis for the optimal design of solid-state hydrogen storage reactors and offer valuable guidance for subsequent engineering applications.
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