储氢合金PCT试验系统研究

Research on PCT Test System of Hydrogen Storage Alloy

为了研究储氢合金的性能,通过一套数字控制式PCT试验系统,对LaNi5系列合金材料进行了PCT曲线测试试验。试验过程中,储氢合金吸(放)氢气量的计算方法采用范德华方程、理想气体方程和修正的理想气体状态方程。根据实时测试的压力和温度数据建立了3种气体方程,其中范德华方程采用了盛金公式进行求解,进而计算氢化反应前后氢气的差量,即为吸(放)氢的量。根据试验数据对不同气体状态方程计算方法下的PCT曲线特性进行了分析、对比与讨论。结果表明,中压时的3种方程的平台压测试结果差异较小;低、高压时的范德华方程由于考虑了分子间的作用力及其体积,从而造成测试的吸、放氢量小于其他2种方法。

In order to study the properties of hydrogen storage alloy,the PCT curve test of LaNi5 series hydrogen storage alloy was carried out by a digital controlled PCT testing system.During the test,van der waals equation,ideal gas state equation and the modified ideal gas state equation were used to calculate the amount of hydrogen absorption or desorption.According to the pressure and temperature data measured in real time,three gas equations were established.The sheng-jin formula was used to solve the van der waals equation,and then the difference amount of hydrogen before and after hydrogenation was calculated,that is,the gas amount of hydrogen absorbed.According to the experimental data,the characteristics of PCT curve under different calculation methods of gas state equation were analyzed,compared and discussed.The results show that the platform pressure test results of the three equations under medium pressure have little difference,and the amount of hydrogen absorption and desorption of the van der waals equation under low and high pressure is less than that of the other two methods due to the consideration of the intermolecular force and volume.