Nonuniformity behavior during regeneration of the diesel particulate filter

Abstract

The incomplete regeneration of diesel particulate filter may cause a local build-up of the soot on the partially regenerated areas during next filtration cycle. This may be one of reasons causing the melting of the ceramic filter during regeneration. In this paper, we investigated several situations at which the particulate matter was partially regenerated. The simulations illustrated that at stationary feed conditions, the influence of nonuniformity of soot loading on the peak temperature rise was less important. When regeneration was conducted at transient feed conditions, the peak temperature attained under the condition of uneven soot distribution along the channel, especially more soot accumulated near the end of the diesel particulate filter, was much higher than that attained under the condition of even soot distribution inside the channel.

Diesel particulate filter regeneration mechanism of modern automobile engines and methods of reducing PM emissions: a review

“…Now it is known that the causes of DPF uncontrolled regeneration are mainly divided into three categories, as follows (Chong et al 2011 ) (Chen et al 2011c ) (Chen et al 2011c ) (Chen and Sun 2013 ): If the content of SOF in the components of PM is too high, it will enhance the oxidation effect of regeneration. In addition, feed temperature and unreasonable temperature rise control will also lead to rapid temperature rise in the initial stage of regeneration.…”

“…When the soot is overloaded, the regeneration tends to cause excessive temperature gradient in the DPF (Chen et al 2011b ). Inhomogeneous temperature rise can cause the filter to crack or melt (Chen and Sun 2013 ). Therefore, for advanced regeneration strategies, accurate soot prediction is essential.…”