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基于金属氢化物吸氢基本特性,建立圆柱形金属氢化物储氢器吸氢过程的一维数学物理模型。采用有限差分法对金属氢化物床体的传热传质进行计算。分别研究金属氢化物床体各处温度和氢含量在吸氢过程中的变化以及氢气压力、对流传热系数和金属氢化物床体径向厚度对金属氢化物吸氢过程的影响。计算结果表明:初始阶段金属氢化物床均匀吸氢,但随着氢化过程的进行,其中心区域的吸氢速率逐渐低于边缘区域;增加吸氢压力、提高对流传热系数均可促进储氢器的吸氢;金属氢化物床的径向厚度对吸氢速率影响很大,金属氢化物床越薄,氢化反应的速度越快。
Based on the basic characteristics of metal hydride hydrogen absorption, a one-dimensional mathematical and physical model of hydrogen absorption in a cylindrical metal hydride hydrogen storage device was established. Finite difference method is used to calculate the heat and mass transfer of metal hydride bed. The effects of hydrogen pressure, convective heat transfer coefficient and radial thickness of metal hydride bed on the hydrogen absorption of metal hydride were studied respectively. The results show that the hydrogenation of metal hydride in the initial stage is uniform, but the hydrogen absorption rate in the central region is gradually lower than that in the edge region as the hydrogenation process progresses. Increasing the hydrogen absorption pressure and increasing the convective heat transfer coefficient can promote the hydrogen storage Hydrogen absorption of the device; the radial thickness of the metal hydride bed greatly affects the hydrogen absorption rate, the thinner the metal hydride bed, the faster the hydrogenation reaction.