针对制氢系统碱性水电解过程中凹凸双极板上碱液分布不均现象进行双极板结构的优化,以5 Nm3/h碱性电解槽凹凸双极板为研究对象,利用CFD方法其在工作时的碱液流速分布规律,通过数值模拟分析结果表明,碱性电解槽凹凸双极板上碱液流动的高速区集中于极板中心轴。针对该现象提出优化方案,一方面通过在凹凸双极板碱液入口端倾斜设置导流槽,从而使电解液分散进入流场;另一方面通过将凹凸双极板传统的球形凹凸结构优化为椭球形凹凸结构,从而对碱液进行适当的分流与聚流。仿真结果表明,通过设置斜式导流槽和改变凹凸结构,能提高双极板的流场均匀性。
Abstract
To tackle the non-uniform distribution of alkaline electrolyte across the corrugated bipolar plates during alkaline water electrolysis process for hydrogen production, the present work undertakes a structural optimization of the bipolar plates in a 5 Nm³/h alkaline electrolyzer. Computational fluid dynamics was employed to resolve the electrolyte velocity field under representative operating conditions. Numerical results indicate that the high-velocity zone is concentrated along the central axis of the existing corrugated plates, undermining flow uniformity. Two complementary remedies are therefore proposed. First, inclined guide grooves are introduced at the electrolyte inlet to laterally disperse the incoming flow. Second, the conventional spherical protrusions and recesses are replaced by ellipsoidal corrugations that alternately split and refocus the electrolyte stream. Simulations demonstrate that the combination of slanted inlet grooves and ellipsoidal surface topography markedly improves flow uniformity across the entire bipolar plate.
关键词
氢能 /
电解槽 /
数值模拟 /
凹凸双极板 /
斜式导流槽
Key words
hydrogen energy /
electrolyzer /
computer simulation /
concave-convex bipolar plates /
inclined diversion groove
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基金
国家自然科学基金（52475701; 5275111）
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