氢燃料电池系统多喷嘴氢气引射器的特性仿真与过程策略

Characteristic simulation and process strategy of multi nozzle hydrogen ejectors for hydrogen fuel cell system

氢气引射器由于体积小、成本低、低功耗、无噪声等优点,是代替氢气循环泵的有效方案。针对单喷嘴引射器作用范围狭窄的问题,提出了多喷嘴氢气引射器的设计,满足燃料电池系统全功率强变载的需求。利用gFUELCELL仿真建模平台,研究了四喷嘴引射器的引射特性及动态拉载过程中电堆内物理场变化,并对搭载四喷嘴引射器的150 kW燃料电池系统的过程策略进行了优化。研究结果表明:与单喷嘴引射器相比,四喷嘴引射器可以覆盖8~153 kW电堆工况范围,实现燃料电池系统运行从怠速到峰值功率的全覆盖。

Hydrogen ejector is promising alternative to hydrogen circulation pumps due to the advantages of small volume,low cost,parasitic power free and low noise.Single nozzle ejector has limited action ranges.Therefore,a multi nozzle ejector was used to address requirements of full power and strong load variation in fuel cell systems in this study.Injection characteristics of a four nozzle ejector and physical field variation inside the stack during dynamic loading were studied using a gFUELCELL simulation modeling platform.The process strategy of a 150 kW fuel cell system equipped with a four nozzle ejector was optimized.The results show that compared with a single nozzle ejector,the four nozzle ejector can cover the operating range of 8-153 kW fuel cell stack,which achieves full coverage from idle to peak power of fuel cell systems.