在道路条件下使用有机兰金循环减缓天然气发动机的催化剂老化
Chongyao Wang1, Xin Wang1, Yunshan Ge1
1School of Mechanical Engineering, Beijing Institute of Technology, Zhongguancun South Street No.5, 100081 Beijing, China.
将有机兰金循环 (ORC) 系统与三向催化剂 (TWC) 集成,可以显著减少排气热损伤,并延长TWC的寿命. 这种方法可以提高发动机功率并通过回收废气能量来降低成本.
科学领域:
- 汽车工程 汽车工程
- 热力学是一种热力学.
- 环境科学 环境科学
背景情况:
- 天然气发动机的高排气温度会导致功率损失和后处理系统的过早老化,如三向催化剂 (TWC).
- 这种热应力限制了排放控制系统的运行寿命和效率.
研究的目的:
- 调查引擎和TWC之间的有机兰金循环 (ORC) 系统的集成,以减轻高排气温度.
- 评估ORC系统在提高功率输出,延长TWC寿命和提高经济可行性方面的有效性.
主要方法:
- 使用实验数据开发和验证用于发动机,TWC和车辆动态的综合模拟模型.
- 在全球协调轻型车辆测试周期下对ORC性能进行模拟,涉及三种TWC技术场景 (旧,现有,未来).
- 基于不同TWC工作温度的热损害减少,TWC寿命延长和功率增强的分析.
主要成果:
- ORC系统可以减少98.5%以上的热损伤,并将TWC的寿命延长至少55.4%,从而减少贵金属的使用和成本.
- 降低的TWC工作温度使ORC能够在更多的驾驶条件下回收废气能量,将净功率提高高达109%.
- 对ORC硬件成本的回报期减少了62.30%,特别是与低温TWC系统相结合时.
结论:
- ORC-TWC合为缓解TWC的热衰老和延长其使用寿命提供了重要的途径.
- 这种集成提高了发动机性能和经济效益,特别是对于为较低工作温度设计的TWC.
- 这项研究为在现实驾驶条件下使用TWC实现ORC系统提供了宝贵的参考.
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