不同热导率下MIL-101(Cr)储氢过程的数值模拟研究

Numerical Simulation of Hydrogen Storage Process in MIL⁃101(Cr)with Different Thermal Conductivity

在MOFs材料储存氢气过程中,由于材料本身热导率低,导致热量聚集,影响氢气储存性能。为了提高吸附材料的导热性能,且兼顾其储氢能力,利用数值模拟的方法,分析了吸附材料热导率的最佳调控范围。结果表明,当吸附材料热导率为0~1.2 W/(m·K)时,储氢罐的最高温度、平均温度和吸氢量随着热导率的提高得到明显的改善;当吸附材料热导率大于1.2 W/(m·K)时,改善效果明显减弱;当吸附材料热导率大于2.0 W/(m·K)时,改善效果几乎消失。因此,吸附材料的最佳热导率应当控制在1.2 W/(m·K)左右。

In the process of hydrogen storage by MOFs materials,the low thermal conductivity of the materials leads to heat accumulation,which affects the hydrogen storage performance.In order to improve the thermal conductivity of the adsorbent material and take into account its hydrogen storage capacity,numerical simulation was used to analyze the optimal regulation range of the thermal conductivity of the adsorbent material.The results show that when the thermal conductivity of the adsorbent material is in the range of 0~1.2 W/(m·K),the maximum temperature,average temperature and hydrogen absorption capacity of the hydrogen storage tank are obviously improved with the increase of thermal conductivity.When the thermal conductivity of the material is greater than 1.2 W/(m·K),the improvement effect is significantly weakened;when the material thermal conductivity is greater than 2.0 W/(m·K),the improvement effect almost disappears.Therefore,the optimal thermal conductivity of the adsorbent should be controlled at about 1.2 W/(m·K).