进气和压缩气反吹缸内燃烧再生的柴油机微粒过滤器

设计了一种以耐高温滤袋为过滤元件的柴油机排气微粒双过滤器系统。利用柴油机工作时大量进气流的反吹过程把沉积在滤袋上的微粒(PM)送回到气缸内,辅助用压缩气体喷嘴扫描反吹方法强制把沉积的PM彻底从滤袋上分开而随进气流回到气缸中,在燃烧室内烧掉PM实现袋式过滤器再生,达到袋滤器彻底再生的目的。在一台单缸柴油机上进行了验证性试验。结果表明,袋滤器能保证82%～94%的过滤效率。在过滤时间和再生时间相等的稳定工况下,袋滤器的进、排气阻力得到彻底恢复,能增加再生后所维持的过滤时间而减少再生频率,表明进气加上压缩气体反吹过程不仅能把滤袋捕集的微粒重新送回气缸中,而且微粒能在燃烧室中烧掉实现系统有效再生。

Bag-type DPF Regenerated by Intake Flow and High-pressure Air Reverse Blow and In-cylinder Combustion of Particulate

A dual diesel particulate filter system was developed by using the heat resistant filter bag as filtering element.The intake fresh air of the diesel engine was used to blow off the deposited particulate matters(PM) and send them back to the cylinder.The blow-off PM in the filter was assisted by high-pressure air scanning reverse flow.The PM burning in the cylinder realized the regeneration of the filter.The verification tests were performed in the dynamometer test bed with a single-cylinder diesel engine.Under the steady operating condition,and the filtering time span was equaled to the regeneration time span,the resistance of intake and exhaust of bag-type-filter rehabilitated thoroughly.It showed that the intake process of the intake fresh air and high-pressure air could blow off the deposited PM on the outer surface of the bag,ensure the successful regeneration of the bag-type-filter with filtering efficiency of 82%~94%.