太阳能驱动的固体氧化物电解池制氢系统性能研究

采用太阳能驱动电解水制氢是实现将太阳能转换为氢能来存储的最佳方式。该文提出一种采用光伏、光热协同驱动固体氧化物电解池（SOEC）进行高温蒸汽电解的制氢系统。建立各子系统数学模型,选取北京地区夏至日气象参数,分析太阳辐照度对制氢系统的性能影响,最后对整个系统进行能量及火用分析。结果表明,电流密度和温度是影响SOEC工作的重要因素。在电流密度较大的情况下升高温度,将有利于提高电解效率。耦合太阳能后系统最大能量及火用效率分别达到19.1%和20.3%。火用分析结果表明系统最大有用功损失发生在光电转换过程,火用损比例为87%。提升光电效率,将成为提高太阳能-氢能转换效率的关键。

PERFORMANCE STUDY ON SOLID OXIDE ELECTROLYTIC CELL HYDROGEN PRODUCTION SYSTEM DRIVEN BY SOLAR ENERGY

Hydrogen production by electrolysis of water driven by solar energy is the best way to convert solar energy into hydrogen energy for storage. This paper proposes a hydrogen production system that uses photovoltaic and photothermal technologies to drive solid oxide electrolytic cells for high-temperature steam electrolysis. The mathematical model of each subsystem is established, and the influence of solar irradiation intensity on the performance of hydrogen production system is analyzed by selecting the meteorological parameters of summer solstice in Beijing. Finally, the energy and exergy analysis of the overall system is carried out. The results show that both the current density and the operation temperature are important factors affecting SOEC operation. In the case of the high current density, increasing the operation temperature will be beneficial to improve the electrolytic efficiency. The maximum energy and exergy efficiencies of the system after coupling solar energy can reach 19.1% and 20.3%, respectively. Exergy analysis shows that the maximum useful effort loss of the system occurs in the photoelectric conversion process, and the loss ratio is 87%. Improving the photoelectric conversion efficiency will be the key to improve the solar-hydrogen conversion efficiency.