HYDROGEN PRODUCTION IN A NOVEL CFB MEMBRANE REFORMER AND CATALYST DEACTIVATION AND ENGINEERING CONTROL

摘要

The catalyst deactivation and reformer performance in a novel circulating fluidized bed membrane reformer (CFBMR) is investigated. A number of palladium based hydrogen permeable membranes are used. A catalyst deactivation model is developed. The results show that the reforming system has a strong tendency for carbon deposition and significant catalyst deactivation at low steam to carbon feed ratios (<1.4 mol/mol) for the operation under high reaction temperatures (>700 K) and pressures (>506.5 kPa). The results for the cases without and with hydrogen membranes are similar. Based on this preliminary investigation, an engineering control approach, in-site control with a concept of critical steam to carbon feed ratio is proposed and used to determine the carbon deposition free boundary for both cases without and with hydrogen membranes in the CFBMR.