灰分对柴油机颗粒捕集器性能影响研究综述

分别从柴油机颗粒捕集器(DPF)灰分的成分、来源及性质,灰分对DPF压降、过滤效率和再生过程的影响,及DPF清灰方法等方面进行了综述。已有研究结果表明:润滑油添加剂是DPF灰分的主要来源;润滑油配方、灰分沉积形态及DPF载体结构不同时,灰分对DPF压降的影响效果会有所不同;灰分在DPF中的沉积一般会提高DPF的过滤效率,但会恶化催化型DPF(CDPF)的被动再生效果,影响DPF主动再生频率和DPF主动再生时的温度;重型柴油车DPF需要定期清灰,压缩空气反吹法是目前使用最广泛的DPF清灰方法。

A Review of Ash Effects on DPF Performance

The effects of ash on DPF performance was reviewed in terms of the DPF ash compositions, sources, and properties, the effects of ash on DPF pressure drop behavior, filtration efficiency, and regeneration process, and the DPF ash cleaning methods. The reported studies showed that DPF ash primarily comes from the additives of the engine lubricant oil. The effects of ash on DPF pressure drop behavior vary with the changes of lubricant oil formula, ash deposition pattern, and DPF structure design. The accumulation of ash in DPF generally improves the filtration efficiency of the DPF, but it deteriorates the passive regeneration effects of the catalyzed DPF, and negatively affects the DPF active regeneration frequency as well as the filter temperature during active regeneration. Periodic ash cleaning is needed for the DPFs for heavy-duty applications, and the reverse flow pneumatic cleaning is currently the most prevalent method for DPF ash cleaning.