Solid oxide electrolysis cell under real fluctuating power supply with a focus on thermal stress analysis

Yi Sun, Xiongfeng Hu, Jun Gao, Yu Han, Anwei Sun, Nan Zheng, Wei Shuai, Gang Xiao, Meiting Guo, Meng Ni and Haoran Xu

Energy, 2022, vol. 261, issue PA

Abstract: Solid oxide electrolysis cell (SOEC) can efficiently utilize electricity for fuel generation through high-temperature electrochemical reaction. When directly using renewable powers, SOEC will frequently deviate from the optimal operating conditions and generate severe thermal stress, leading to cracks or even thermomechanical failure. To investigate the thermomechanical behavior of SOEC with fluctuating power supply, we develop 2D dynamical models by fully considering the electrochemical reaction, electron/ion/molecular transport, heat/momentum transfer and thermal-mechanical interaction. The distribution of thermal stress is detailly analyzed and the inlet gas temperature is identified as a key factor, where the maximum thermal stress can be decreased from 305 to 135 MPa with the inlet gas temperature increasing from 973 to 1073 K. We also dynamically optimized the anode gas flow rate by following fluctuating applied voltages, where a power function of voltage V5 is found to be an optimum choice. Compared with a constant flow rate of 400 SCCM, the maximum temperature and thermal stress with dynamically controlled flow rate can be decreased by 98.7 K and 65.3 MPa, respectively. This paper presents an implementation approach for the peak temperature reduction and thermal stress optimization in SOECs.

Keywords: olid oxide electrolysis cell; Numerical simulation; Thermal stress; Fluctuating renewable power; Performance optimization (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:261:y:2022:i:pa:s0360544222019910

DOI: 10.1016/j.energy.2022.125096

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