为响应能源动力领域低碳节能的战略需求,促进固体氧化物燃料电池(SOFC)商业化应用,设计了一种SOFC-发动机联合动力系统,以NH
3
、H
2
、天然气为燃料,并结合尾气余热梯级利用技术。首先建立并验证了系统的数学模型,然后对系统模型进行了热力学分析,探究了不同零碳燃料、低碳燃料应用时关键参数对系统性能的影响。结果表明:燃料流率增大时系统效率无明显变化,H
2
作燃料时SOFC与发动机子模块效率最佳,但使用NH
3
系统总效率最高,可达81.96%;当量比保持在1时可使系统整体效率达到最优;蒸汽燃料比从0.8降低到0.2时系统总效率随之升高,但其过低也会导致系统经济性变差;理想条件下,该系统应用在动力机械装置中时,考虑到SOFC装置与发动机模块的耦合性,SOFC工作温度维持在600℃~650℃为宜。
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