带有SDPF的轻型柴油发动机的颗粒物和气态污染物的排放特性
Pi-Qiang Tan1, Jia-Jun Wang1, Li-Shuang Duan1
1School of Automotive Studies, Tongji University, Shanghai 201804, China.
ACS omega
|October 9, 2023
概括
在柴油颗粒过器 (SDPF) 上涂层的选择性催化减排有效降低了柴油发动机的排放量. DOC + SDPF 系统在低温,低负载条件下也能达到90%以上的颗粒物和气体污染物的效率.
科学领域:
- 环境科学 环境科学
- 机械工程 机械工程
- 化学工程是化学工程的重要组成部分.
背景情况:
- 柴油发动机产生大量的颗粒物 (PM) 和氧化 (NOx) 排放.
- 未来的法规越来越关注在低负荷和低温度下控制NOx排放.
- 在柴油颗粒过器 (SDPF) 上涂层的选择性催化降解可以同时降低PM和NOx.
研究的目的:
- 评估柴油氧化催化剂 (DOC) 与SDPF相结合在减少发动机排放方面的有效性.
- 分析DOC+SDPF对颗粒体大小分布,过效率和气态污染物转换的影响.
- 在各种稳定状态运行条件下评估性能,特别是低温和低负载场景.
主要方法:
- 使用了一台配备DOC和SDPF系统的轻型柴油发动机.
- 在排气系统的多个点 (DOC之前,DOC之后,SDPF之后) 测量了颗粒和气体污染物的排放量.
- 在10个不同的稳定状态运行条件下进行测试.
主要成果:
- DOC + SDPF系统证明了在10-23纳米大小范围内的PM的显著捕获.
- 在低温,低负荷条件下,气体污染物和PM的转化和过效率超过90%.
- 报告的具体效率为:PM的94.37%,粒子数 (PN) 的90.36%,NOx的91.43%.
结论:
- 组合的DOC + SDPF系统在减少柴油发动机排放方面非常有效,特别是NOx和PM.
- 该系统在具有挑战性的低温和低负载运行条件下表现出卓越的性能.
- SDPF技术代表了满足未来柴油发动机严格排放标准的有希望的解决方案.
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