静态供水式碱性水电解模拟

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摘要氢能具有可持续、绿色清洁以及能量密度高等优点,将是低碳社会能源体系的重要组成部分。利用水电解技术将可再生能源转化为氢能是制氢的理想途径之一。首次建立了静态供水式碱性水电解二维数值模型,全面了考虑质量、动量、热量和电荷传递、电化学反应及其耦合关系。不同供水温度下的极化曲线计算结果与实验数据符合良好。分析了反应活化、浓度极化与欧姆阻抗导致的各部分过电位在总电压中的占比,着重考察了供水推动力与阻力的变化对电解性能的影响。结果表明,活化过电位中与电解质层水含量相关联的部分在总电压中占比较高,水的传递对电解性能具有重要影响。水蒸气向阴极传递距离的降低、电解质层KOH含量略高于30%的工业标准均有利于提高电解性能,但电流密度、电解质层KOH含量、阴极气体间隙层厚度和温度应相互匹配,以确保系统处于适宜工况。

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	费洪达
	葛升
	闵洛夫
	高峰
	王宇新

关键词：电解数值模拟预测传递平衡

Abstract： With the advantages of sustainability, green and clean, and high energy density, hydrogen will be an important part of the energy system in low-carbon society. Using water electrolysis technology to convert renewable energy into hydrogen is an ideal way of hydrogen production. A two-dimensional numerical model of static feed alkaline water electrolysis(SFAWE) was developed for the first time in this study, taking into consideration the transport of mass, momentum, heat, charge, and their coupling with electrochemical reactions. The polarization curves under different temperatures of feed water are in fine agreement with experimental data. The rise of cell voltage due to activation, concentration polarization and ohmic loss was analyzed. The impact of the driving force and resistance of water supply on electrolysis performance was investigated. It is shown that the activation overpotential associated with the water content of the KOH electrolyte takes a considerable part in the total voltage rise, indicating the impact of water transport on the electrolytic performance. The reduction of water vapor transport resistance to the cathode and the KOH content of the electrolyte layer being slightly higher than the 30%(mass fraction) industry standard both could improve electrolysis performance. But the current density, the KOH content of the electrolyte layer, the thickness of the cathode gas gap layer and the feed water temperature should match each other to ensure that the system is under suitable operating conditions.

Keywords： electrolysis numerical simulation prediction transport equilibrium

Received 2021-03-25;

Fund:人因工程国防科技重点实验室预研基金(6142222180601)。

Corresponding Authors: 王宇新,教授,E-mail:yxwang@tju.edu.cn。 Email: yxwang@tju.edu.cn

About author: 费洪达(1996-),男,硕士研究生,现从事碱性水电解方面的研究。

引用本文:

费洪达, 葛升, 闵洛夫, 高峰, 王宇新.静态供水式碱性水电解模拟[J]. 化学工业与工程, 2022,39(4): 94-105

FEI Hongda, GE Sheng, MIN Luofu, GAO Feng, WANG Yuxin.A numerical simulation of static feed alkaline water electrolysis[J]. Chemcial Industry and Engineering, 2022,39(4): 94-105

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