金属氢化物储氢容器吸/放氢过程模拟研究

SIMULATION RESEARCH OF HYDROGEN ABSORPTION AND DESORPTION PROCESS IN METAL HYDRIDE HYDROGEN STORAGE VESSEL

基于储氢合金LaNi5吸放氢性能,建立金属氢化物的储氢数值模型,并利用COMSOL软件进行模型的模拟研究,重点分析直管、翅片与螺旋管结构对容器吸氢和放氢性能的影响。结果表明:内壁加翅片、带有螺旋管换热的两种结构能有效提高储氢容器吸氢速率,大幅缩短吸/放氢过程时间;温度云图显示,容器内壁加翅片的结构,热量是从壁面向容器中心进行传导;对于容器内部增加螺旋管换热结构,传热是从螺旋管向四周进行,且传热效率更高。与初始模型相比,带有螺旋管换热器结构其吸/放氢质量达到最大质量90%所需时间分别减少31.58%和31.12%。

In this work,the mathematical model of hydrogen absorption/desorption of metal hydride was established based on hydrogen storage alloy LaNi5,besides,the model was simulated by COMSOL.Based on this model,the effects of straight tube,fin tube and spiral tube structure on hydrogen absorption and desorption performance of hydrogen storage vessel were analyzed.The results indicate that the hydrogen storage vessels with internal fins or spiral tubes can significantly improve the hydrogen absorption/desorption performance.The temperature cloud diagram shows that the heat transfer in the structure of internal wall fins of vessel is from the heat exchange wall to the center of the container,while the heat transfer in the vessel with spiral tubes is from spiral tube to all sides which makes the metal hydride hydrogen storage vessel with spiral tube have higher heat transfer efficiency.Compared with the basic model,the time required to reach 90%of the maximum hydrogen absorption/desorption capacity of the hydrogen storage vessel with spiral tube is reduced by 31.58%and 31.12%respectively.