考虑分布式参数的影响,研究外部电场激励下大容量碱液电解槽的反应特性,发现电解槽的宏观物理结构对系统的运行特性有较大影响,基于此提出一种新型碱液制氢电解槽等效电路模型。通过对不同工况下电解槽的工作状态和反应过程进行分析,揭示外部电场对大容量碱液电解槽反应的激励机理。研究发现：相比于电极材料微观特性,电解槽的结构尺寸对宽范围工况下系统的运行特性起到更为关键的作用。最后,基于自制的碱液电解槽原理样机进行宽范围电解制氢实验,发现在不同工况下,所提模型均能较好地刻画电解槽的运行特性,并验证了模型的有效性。
Abstract
The traditional model of alkaline water electrolyzers （AWEs） is established based on electrochemical equations and only suitable for micro-electrolysis systems with a single electrolysis cell. However, for large-capacity AWEs used for hydrogen production from renewable energy, traditional models have great limitations and cannot fully describe operating characteristics in wide range. By analyzing the reaction process of the electrolyzers under different working conditions, this paper reveals the excitation mechanism of the external electric field for the reaction of the large-capacity AWEs and a new equivalent circuit model of the AWEs is proposed. It is found that the physical structure of the electrolytic cell has a more critical influence on the characteristics of the AWEs than that of the microscopic characteristics of the electrode material in wide range. Finally, based on the prototype of the self-made AWEs, experiment for hydrogen production is carried out. The results show that the model proposed in this paper can better describe the operating characteristics of the electrolyzers under different working conditions.
关键词
可再生能源 /
制氢 /
电解槽 /
等效电路模型
Key words
renewable energy /
hydrogen production /
electrolytic cells /
equivalent circuit model
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基金
国家重点研发计划（2020YFB1506800）; 国网科技部项目（52110421005H）; 国家自然科学基金（U2166203）; 浙江省尖兵领雁攻关项目（2022C01161）; 中央高校基本科研业务费专项资金（226-2022-00053）
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