摘要
PEM电解槽作为一种制氢设备在高电流密度阶段电压损耗严重,主要原因是现有阳极侧流道易出现氧气堆积,反应介质传输能力不足,因此迫切需要对流道构型进行优化。以电解槽水气传输为切入点,在传统平行流道的基础上,提出了一种新型楔形流道。建立电解槽水气传输模型,通过透明电池实验验证了模型的准确性。利用模型分析了平行流场在高电密工况下的水气传输行为,发现氧气聚集是设备性能下降的主要原因。提出了楔形流道设计,氧气的质量流量对比平行流道上升11.9%。完成了两种流场电解槽的试制,通过极化曲线表征,得出楔形流道的传质特性优于平行流道。为电解槽流道设计提供了指导。
As a hydrogen production equipment,the PEM electrolysis suffers from severe voltage loss during the high current density stage.The main reason is that oxygen accumulates in the flow channel on the anode side and the transmission capacity of the reaction medium is insufficient.Therefore,it is urgent to optimize the flow channel.In this paper,the wedge-shaped flow channel is proposed based on the traditional parallel flow channel based on the two-phase flow transport.First,the two-phase flow model of the electrolysis is constructed,and the correctness of the model is verified by visualizing cell experiments.Secondly,the two-phase flow behavior of the parallel flow field at high-density conditions is analyzed by the model,and oxygen aggregation at the outlet is the main reason for the performance losses.Finally,a wedge-shaped channel design is proposed,and the mass flow rate of oxygen increases by 11.9%compared with parallel channels.Two types of flow fields have been produced,and the mass transfer of the wedge-shaped channel is better than the parallel channel through the characterization of the polarization curve.This paper provides guidance for channel design for electrolysis.
作者
刘洋
邱殿凯
彭林法
林赫
LIU Yang;QIU Diankai;PENG Linfa;LIN He(College of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《机械设计与研究》
CSCD
北大核心
2023年第5期142-146,共5页
Machine Design And Research
关键词
制氢设备
电解槽水气传输模型
流道设计
楔形流道
hydrogen production equipment
two-phase flow model of the electrolysis
channel design
wedgeshaped channel
