The Security Research Of Metal Hydrides Solid Hydrogen Storage System

The current worldwide overuse of fossil fuels has led to an unprecedented increase in environmental and energy shortages.In order to mitigate this phenomenon,we need to find alternative sources of renewable clean energy to replace fossil fuels,in which hydrogen is considered to be more One of the alternative energy sources.Hydrogen energy in the process of use,storage and transportation is one of the most crucial steps.Hydrogenstored in a solid state form of metal hydrides offers a safe and efficient storage technique for hydrogen application.However,there are some disadvantages of solid-state hydrogen storage at present.In a closed metal hydride tank,stresses may occur on the tank wall due to hydride expansion during hydrogen absorption process.In the first part of the paper the applications and development prospect.Common hydrogen storage methods include high-pressure hydrogen gaseity storage,low temperature liquid hydrogen storage and metal hydride solid hydrogen storage sa a key detail.The possible exist security risks of metal hydride solid hydrogen storage has been analysised.1.Taking MlNi_4.5Cr_0.45Mn_0.05.05 alloy as an example,the influencing factors and stress generation mechanism of the expansion stress in hydrogen storage and desorption hydrogen storage alloysIn the present investigation,a testing system for swelling stress of MlNi_4.5Cr_0.45Mn_0.05.05 alloy in a closed cylindrical reactor during hydrogen absorption-desorption process was built.The results show that considerable swelling stress is developed on the inner reactor wall during activation process though a high free space of 45%is presented.Increasing hydrogen charging pressure and alloy loading fraction increase the as-generated swelling stress.The metal hydride particle expansion caused by hydrogen absorption is the intrinsic factor for swelling stress evolution while the presence of particle agglomerates in a closed tank in which their expansion are constrained is responsible for the formation of swelling stress accumulation.2.Exploring to decrease hydrogen hydrogenation expansion stress of MlNi_4.5Cr_0.45Mn_0.05.05 hydrogen storage alloyIn order to reduce the expansion stress,the expansion stress detection model of the hydrogen absorption and release process of a dimethyl silicone oil/hydrogen storage alloy mixture was established on the basis of the original test system.Compared with the original model,it was found that the swelling stress of the inner wall of the container was much smaller than that of the MILN_4.5Cr_0.45Mn_0.05.05 without adding silicone oil when the hydrogenation of the dimethyl silicone oil/hydrogen storage alloy mixture.And by adding the amount of dimethyl silicone oil to quantify the comparison,found that 3wt%silicone oil can increase the amount of expansion stress to achieve the best results.In this study,the study of the expansion stress in the hydrogen storage process of metal hydride solid hydrogen storage device provides the necessary reference for the design specifications of metal hydride solid hydrogen storage device,and provides a feasible method for effectively reducing the hydrogen absorption of hydrogen storage alloy Program.3.Metal hydride solid state hydrogen storage welds nondestructive testingThe strength of the hydrogen storage vessel is one of the important indicators to measure the safety of hydrogen storage containers.X-ray nondestructive testing of metal hydride storage vessels was carried out.It was found that there was no obvious defect in the weld of the container welded by argon arc welding,and the weld quality was perfect.Therefore the strength of the welding site and the normal service life of the hydrogen storage container were affected by the presence of the defect.