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汽车安全与节能学报 ›› 2021, Vol. 12 ›› Issue (2): 257-264.DOI: 10.3969/j.issn.1674-8484.2021.02.015

• 汽车节能与环保 • 上一篇    

直喷氢内燃机实现NOx近零排放的试验研究

包凌志(), 孙柏刚, 汪熙   

  1. 北京理工大学 机械与车辆学院,北京 100081,中国
  • 收稿日期:2021-04-17 出版日期:2021-06-30 发布日期:2021-06-30
  • 作者简介:包凌志(1997—),男(汉),安徽,博士研究生。Email:bitbao@qq.com

Experimental investigation of nearly zero-emission direct injection hydrogen engine

BAO Lingzhi(), SUN Baigang, WANG Xi   

  1. School of Mechanical Engineering, Beijing institute of Technology, Beijing 128000, China
  • Received:2021-04-17 Online:2021-06-30 Published:2021-06-30

摘要:

缸内混合气分布不均匀、燃烧温度高等原因,直喷氢内燃机的氮氧排放水平很高。为探索降低直喷氢内燃机NOx排放的控制方法,该文基于一台2.0 L自然吸气直喷氢内燃机,通过试验研究了过量空气系数、转速、点火角和喷氢压力对NOx排放的影响,并通过多参数的耦合调节,控制NOx排放,得到了样机的最大动力性下,未经后处理就实现近零排放(NOx≤20×10 -6)工作边界。研究表明:通过稀燃和推迟点火角,可以在牺牲少量热效率和燃烧稳定性的同时大幅降低NOx排放;近零排放工作区域的最大功率为21.5 kW,最高热效率为39%,在此区域内的所有工况点都可以实现近零排放。

关键词: 直喷氢内燃机, 氮氧排放, 排放控制, 近零排放

Abstract:

The nitrogen oxides (NOx) emission level of a direct injection hydrogen engine is relatively high due to the uneven mixture distribution in the cylinder and high combustion temperature. The effect of excessive air coefficient, speed, ignition angle, and hydrogen injection pressure on NOx emission was investigated to explore the control method of reducing NOx emission with a 2.0 L naturally aspirated direct-injection hydrogen engine. Without post-treatment, the working boundary of the maximum power with near-zero-emission (NOx≤20×10 -6) was achieved by the coupling of multiple parameters. The results show that NOx emissions can be significantly reduced by lean-burning and delaying the ignition angle with making a sacrifice to a small extend in a small amount of thermal efficiency and combustion stability. The maximum power in the near-zero emission working area is 21.5 kW and the maximum thermal efficiency is 39%, and near zero emission can be achieved at all working points in this area.

Key words: direct injection hydrogen engine, nitrogen and oxygen emission, emission control, near zero emissions

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