Process Modelling and Thermodynamic Analysis of Hydrogen Production by High Temperature Solid Oxide Electrolysis Under the Background of Carbon Neutrality

doi:10.12096/j.2096-4528.pgt.21010

Abstract

Abstract:

Water electrolysis can transform unstable renewable energy into the hydrogen energy and realize large-scale and seasonal energy storage, which is one of the key means to achieve the goal of "carbon neutrality" in China. The technology of high temperature solid oxide electrolysis cell (SOEC) was discussed and studied, and the working principle of the high temperature solid oxide electrolysis was introduced. According to its actual operation characteristics, the electrochemical model and thermodynamic model of electrolysis process were established, and the models were verified by comparing with the experimental data. Furthermore, the effects of current density and operating temperature on the high temperature solid oxide electrolysis were analyzed, and the thermodynamic analysis was conducted. The results show that the thermal integration and management of SOEC at high temperature will be conducive to reduce the power consumption. If the high-temperature electrolysis process is combined with other industrial processes and utilized the low-grade industrial waste heat, the overall efficiency of high-temperature solid oxide electrolysis is expected to be further improved.

Key words: carbon neutrality, renewable energy, hydrogen production by electrolysis, high temperature solid oxide, electrochemical model, thermodynamic analysis

CLC Number:

TK91
TQ116.2

Dandan WANG, Yalou LI, Fang LI, Lu SUN. Process Modelling and Thermodynamic Analysis of Hydrogen Production by High Temperature Solid Oxide Electrolysis Under the Background of Carbon Neutrality[J]. Power Generation Technology, 2021, 42(5): 554-560.

Figures/Tables 10

References 20

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操作条件和结构参数	数值
操作压力P/kPa	100
操作温度T/K	973
阴极入口成分及其体积分数	100%O₂
阳极入口成分及其体积分数	90%H₂O，10%H₂
电子转移数n	2
阴极厚度d_H₂/μm	312.5
阳极厚度d_O₂/μm	17.5
电解质厚度d_E/μm	12.5
阴极指前因子γ_c/(GA/m²)	0.39
阳极指前因子γ_a/(GA/m²)	1.39
阴极活化能ΔE_{act, c}/(MJ/mol)	0.1
阳极活化能ΔE_{act, a}/(MJ/mol)	0.12
孔隙曲度ξ	5
孔隙率ε	0.3
孔隙平均半径r/μm	0.5

操作条件和结构参数	数值
操作压力P/kPa	100
操作温度T/K	973
阴极入口成分及其体积分数	100%O₂
阳极入口成分及其体积分数	90%H₂O，10%H₂
电子转移数n	2
阴极厚度d_H₂/μm	312.5
阳极厚度d_O₂/μm	17.5
电解质厚度d_E/μm	12.5
阴极指前因子γ_c/(GA/m²)	0.39
阳极指前因子γ_a/(GA/m²)	1.39
阴极活化能ΔE_{act, c}/(MJ/mol)	0.1
阳极活化能ΔE_{act, a}/(MJ/mol)	0.12
孔隙曲度ξ	5
孔隙率ε	0.3
孔隙平均半径r/μm	0.5

电流密度/(A/m²)	电压模拟值/V		电压实验值/V
电流密度/(A/m²)	923 K	973 K	923 K	973 K
0	0.934	0.915	0.895	0.880
1 000	1.131	1.033	1.064	0.972
2 000	1.249	1.122	1.236	1.077
3 000	1.337	1.193	1.385	1.178
4 000	1.410	1.252	1.510	1.277
5 000	1.474	1.303	1.580	1.360
6 000	1.532	1.350	1.620	1.420
7 000	1.586	1.392	1.655	1.466
8 000	1.636	1.432	1.680	1.510

电流密度/(A/m²)	电压模拟值/V		电压实验值/V
电流密度/(A/m²)	923 K	973 K	923 K	973 K
0	0.934	0.915	0.895	0.880
1 000	1.131	1.033	1.064	0.972
2 000	1.249	1.122	1.236	1.077
3 000	1.337	1.193	1.385	1.178
4 000	1.410	1.252	1.510	1.277
5 000	1.474	1.303	1.580	1.360
6 000	1.532	1.350	1.620	1.420
7 000	1.586	1.392	1.655	1.466
8 000	1.636	1.432	1.680	1.510

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