Size and Shape Effects on Deformation/Fracture Behavior of Vanadium Alloy Membrane for Hydrogen Separation and PurificationTuesday (27.09.2016) 12:09 - 12:12 Part of:
Development of the hydrogen separation membrane device using the non-palladium hydrogen permeable membrane of vanadium (V) alloy is advanced in recent years. On the design of the hydrogen separation membrane device, it is necessary to make an alloy thin film into large area from a viewpoint of the membrane thickness dependability of hydrogen permeation flux. Then, it is necessary to arrange this device inside spatial restrictions and, to operate in the mixed gas under high temperature and high pressure. However, the result examined in the membrane size which has the effective diameter of a few mm on a laboratory scale, even if the membrane fracture by hydrogen embrittlement or gas pressure difference does not occur on hydrogen separation membranes with slight flux in the small area optimized by the assumption service condition, if this membrane is adopted into large area, it has proved that deformation and fracture characteristics of hydrogen permeable membranes are shown recently.
The influence of size and shape on deformation and the fracture characteristics of metal hydrogen separation membranes available in the design of the device are discussed in this study. Hence, the deformation and the stress analyses corresponding to change of the hydrogen permeation effective diameter from a laboratory scale to an industrial scale are performed using FEM. For instance, although the membrane surface maximum stress concerning the Von Mises stress has not reached yield condition for ?5.6mm under the hydrogen differential pressure (Inlet-Outlet) of 300kPa, for ?33mm and ?52mm, the maximum surface stress beyond yield condition is predicted under the same differential pressure. Same analysis is conducted also for the vanadium alloy (e.g., V-10mol%Fe), and this report is focused on the availability of solid solution hardening or a support-medium use.