| 贵金属和助剂负载量对柴油公交车CDPF颗粒净化性能的影响 |
| 摘要点击 1693 全文点击 664 投稿时间：2017-01-08 修订日期：2017-04-14 |
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| 中文关键词 颗粒排放 柴油机 催化型颗粒捕集器(CDPF) 贵金属 助剂 负载量 |
| 英文关键词 particulate matter emissions diesel engine catalyzed diesel particulate filters (CDPF) noble metal promoter capacity |
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| 中文摘要 |
| 为研究CDPF（催化型颗粒捕集器）贵金属和助剂负载量对柴油公交车颗粒排放特性的影响，对一台满足国Ⅲ排放法规的柴油公交车进行改造，加装4种不同后处理装置，并进行道路实车排放试验.结果表明，CDPF贵金属负载量越高，排气颗粒数量浓度越低，在中高车速下尤为明显（60 km·h-1车速下贵金属负载量增加5g·ft-3，颗粒排放总数降低70.8%）.贵金属负载量对排放颗粒物中核态颗粒的影响大于聚集态颗粒.在保证对排气颗粒的净化效果的前提下，在CDPF中添加适量镧系助剂，可使贵金属和助剂负载量大幅降低.不同后处理方案对加速工况不敏感，净化效果差异较小，但减速工况，各方案对颗粒的净化效果差异较大. |
| 英文摘要 |
| This study investigates the influence of noble metal capacity and promoter capacity in diesel oxidation catalysts (DOC) and catalyzed diesel particulate filters (CDPF) on particulate matter (PM) emissions. Four types of exhaust aftertreatments were applied to a diesel bus engine that meets the national Ⅲ emissions regulations. On-board tests were conducted respectively. PM emissions from the engine were strongly influenced by noble metal capacity in DOC and CDPF, especially at high speeds (the total number of particles increased by 70.8% when the noble metal capacity decreased by 5 g·ft-3 at 60 km·h-1). The higher the noble metal capacity was, the lower the PM emissions became, especially for PM in nuclei mode. The lanthanide material contributed to reducing PM emissions significantly. The content of precious metals could be reduced by 25% with proper lanthanide material, while the treatment effect of exhaust particles was guaranteed. In summary, aftertreatments are not sensitive to accelerating conditions, but the purification efficiency is obviously different under decontamination conditions. |
