LaNi_(5)储氢合金吸氢过程热特性研究  

Study on Thermal Characteristics in Hydrogen Absorption of LaNi_(5) Hydrogen Storage Alloy

作　　者：田英[1] 柴牧 谭家辉 吴岱丰 TIAN Ying;CHAI Mu;TAN Jiahui;WU Daifeng(School of Mechatronic Engineering and Automation,Foshan University,Foshan 528225,Guangdong,China;Institute of Resource Utilization and Rare Earth Development,Guangdong Academy of Sciences,Guangzhou 510640,China)

机构地区：[1]佛山科学技术学院机电工程与自动化学院,广东佛山528225 [2]广东省科学院稀有金属研究所,广州510640

出　　处：《机械科学与技术》2023年第7期1150-1157,共8页Mechanical Science and Technology for Aerospace Engineering

基　　金：广东省基础与应用基础研究项目(2020A1515110080,2020B151520006,2021A1515010712)。

摘　　要：建立了某金属氢化物反应器二维数值模型,并通过吸氢实验中反应器温度变化曲线验证了模型的准确性。对储氢反应器增加外部冷却槽,分析了不同冷却流体种类及流速下,反应器温度和储氢量的变化情况。结果表明:冷却水作用下,储氢罐中心区域的反应速率逐渐低于壁面区域,冷却水流速率越高,吸氢反应所需时间逐渐缩短至一个定值;在相同流速下,冷却介质为水和油时,反应器温度与储氢量的变化特征相似,但水的冷却时间比油缩短约20%、储氢时间缩短约15%;当冷却介质为空气时,冷却槽内空气受热浮力影响,靠近壁面的空气流速降低且温度高于初始值,导致其与合金的温差缩小、传热能力降低,吸氢时间明显加长。A two-dimensional numerical simulation model for a metal hydride hydrogen storage tank was established,and the accuracy of the model was verified by using the temperature curve of the tank from experiment.An external cooling channel was added to the tank,the temperature and hydrogen storage amount of the model were analyzed under the different type and flow rate of cooling fluid.The results show that the reaction rate in the center area of the tank is lower than that in wall area under the action of cooling water.With the increasing of cooling water flow rate,the total time of reaction is reduced to a fixed value.At the same flow rate,the variation tendency for water and oil is similar.However,the cooling time and the hydrogen storage time of water are shorter nearly 20%and 15%,respectively.Because of the buoyancy effect,the air velocity closed to the wall decreases and higher than initial temperature,so that the temperature difference between the air and alloy is reduced,the heat transfer capacity is reduced,and the hydrogen absorption time is obviously prolonged.

关 键 词：储氢合金 吸氢反应 传热传质 冷却槽 数值模拟 

分 类 号：TH122[机械工程—机械设计及理论]