A new solid oxide electrolysis cell (SOEC) plant powered by solar energy for carbon dioxide reduction is established, in which the electrical/thermal energy production process, electrochemical reaction process, heat transfer processes, inlet gas compression process and products compression process are considered as the main energy consumption processes. The efficiency expressions for the plant are given under different operating conditions. Thermodynamic-electrochemical analysis shows that the joule heat generated from the irreversibilities in the SOEC may be larger than the thermal energy needed for the carbon dioxide reduction reaction. Some alternative plant layouts are designed to reasonably utilize the surplus waste heat in the SOEC, and accordingly, the expressions of the efficiency for the plant are modified. It is confirmed that the alternative plant layouts can effectively improve the performance of the plant. The effects of the support types of the SOEC, operating current density, operating temperature, operating pressure, effectiveness of heat exchangers and inlet flow rate of the carbon dioxide on the efficiency of the plant are revealed. The problem how to rationally operate the solar concentrating beam splitting subsystem to distribute the incident solar irradiance is solved.
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Wei et al. (2014) studied this question.
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