Comparison of a One-Dimensional Model of a High-Temperature Solid-Oxide Electrolysis Stack with CFD and Experimental Results

O' ; Brien, J. E. ; Stoots, C. M. ; Hawkes, G. L.

Idaho National Laboratory

关键词: Fluid Mechanics;    Flow Rate;    Electrolysis;    Steam High-Temperature Electrolysis;    Solid-Oxide Electrolysis Cells;   

DOI  :  10.2172/911226
RP-ID  :  INL/EXT-05-00398
RP-ID  :  DE-AC07-99ID-13727
RP-ID  :  911226

美国|英语

来源: UNT Digital Library

【 摘 要 】

A one-dimensional model has been developed to predict the thermal and electrochemical behavior of a high-temperature steam electrolysis stack. This electrolyzer model allows for the determination of the average Nernst potential, cell operating voltage, gas outlet temperatures, and electrolyzer efficiency for any specified inlet gas flow rates, current density, cell active area, and external heat loss or gain. The model includes a temperature-dependent area-specific resistance (ASR) that accounts for the significant increase in electrolyte ionic conductivity that occurs with increasing temperature. Model predictions are shown to compare favorably with results obtained from a fully 3-D computational fluid dynamics model. The one-dimensional model was also employed to demonstrate the expected trends in electrolyzer performance over a range of operating conditions including isothermal, adiabatic, constant steam utilization, constant flow rate, and the effects of operating temperature.