High temperature electrolysis using Molten Carbonate Electrolyzer

摘要

Molten Carbonate Fuel Cells (MCFC) are a well-developed and commercial technology that can operate also as an electrolyzer producing hydrogen from steam. In this study, a system for the production of hydrogen based on Molten Carbonate Electrolyzer (MCE) is presented. The system receives, as an external input, water and recovers internally the additional gas streams required as input to the electrolyzer. The system products are, separately, pure oxygen and hydrogen. A calculation sheet was implemented to analyze the energy equilibrium and gas mix compositions. The system can produce 0.074 Nl h-1 cm-2 of hydrogen with an inlet power density of 0.213 W cm-2 for an energy consumption of 3.40 kWh NmH2 -3. Sensitivity studies on current density, utilization factors of both steam and CO2 were analyzed considering energy equilibrium of the stack unit and the post processing processes. Results show how current density has higher impact on system equilibrium compared to the other parameters.(C)& nbsp;2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.