New design for efficient diesel particulate trap regeneration

Zheng, Haishan; Keith, Jason M.

doi:10.1002/aic.10017

Cited by 10 publications

(11 citation statements)

References 11 publications

(16 reference statements)

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“…Both experiments and simulations revealed that an increase of the feed oxygen concentration or temperature increases the DPF temperature under stationary operation 44, 45. The dependence of the DPF temperature on the filtration velocity, defined as the feed flow rate divided by the surface area of the inlet channels, is more intricate.…”

Section: Introductionmentioning

confidence: 99%

Counter‐intuitive temperature excursions during regeneration of a diesel particulate filter

Chen¹,

Martirosyan²,

Luss³

2010

AIChE Journal

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A major technological challenge in the regeneration of diesel particulate filters (DPFs) is that sometimes local high temperature excursions melt the cordierite ceramic filter. The cause of this melting is still an open question as the highest temperature attained under stationary (constant feed) combustion of the accumulated particulate matter is too low to cause this melting (melting temperature $1250 C). We recently conjectured that the high temperature excursions are a counterintuitive response to a rapid deceleration, which decreases the exhaust gas temperature and flow rate and increases the oxygen concentration. Infrared measurements of the spatiotemporal temperature during soot combustion on a single-layer DPF showed that a simultaneous step change of the feed temperature, flow rate, and oxygen concentration can lead to a transient temperature that exceeds the highest attained for stationary operation under either the initial or the final operation conditions. The experiments revealed that the magnitude of the temperature rise depends in a complex way on several factors, such as the direction of movement of the propagating temperature front. The amplitude of the temperature rise is a monotonic decreasing function of the distance that the temperature front moved before the step change. The rapid response to the feed oxygen concentration increases initially the moving front temperature. The slow response of the ceramic DPF to a decrease in the feed temperature may eventually decrease the moving front temperature and even lead to premature extinction and partial regeneration.

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Section: Introductionmentioning

confidence: 99%

Counter‐intuitive temperature excursions during regeneration of a diesel particulate filter

Chen¹,

Martirosyan²,

Luss³

2010

AIChE Journal

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“…These results do not reflect the conditions of regeneration in the DPF. Zheng and Keith reported that there exists a critical inlet gas temperature required for ignition [4]. It is more important and useful to be able to predict the critical inlet gas temperature than the ignition temperature for soot oxidation.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…However, the ignition criteria alone can not give the optimum result. The ignition criteria needs to be combined with the equations to predict ignition time, (which are reported in Zheng and Keith [4]), to optimize the DPF system. Fig.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…Zheng and Keith showed that a bypass design in the DPF system can improve the performance and fuel economy of regeneration by dividing the exhaust gas into two or three parts [4]. They pointed out that the critical inlet gas temperature decreases by increasing the number of channels in the DPF system.…”

Section: Influence Of Various Design and Operating Variables On Ignitionmentioning

confidence: 99%

“…After the solid temperature exceeds the inlet gas temperature, the soot bed is only self-heated by reaction heat released by oxidation of soot, and the exhaust gas cools the soot bed. Zheng and Keith showed that for inlet gas temperatures below a critical value, which is lower than the ignition temperature, the system cannot reach the ignition temperature and fails to ignite [4]. The minimum value of the inlet gas temperature required for ignition, which will be referred to as the critical inlet gas temperature, strongly depends on operating conditions such as the flow rate and oxygen concentration but also on the size and material properties of the DPF.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ignition analysis of wall-flow monolith diesel particulate filters

Zheng

Keith

2004

Catalysis Today

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Averaging theory for diesel particulate filter regeneration

Zheng

Keith

2007

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).Axial thermal gradients play a key role in monolithic diesel particulate filters. For complete particulate regeneration, the ignition location must be near the leading edge of the diesel particulate filter. A new reduced model in terms of the capacitanceweighted and mixing cup average temperature is formulated here using the Liapunov-Schmidt reduction technique to describe the ignition behavior and account for the axial variation. The major advantage of the reduced model is that one can neglect the details of the fine scale dynamics and focus on the large scale dynamics. This new, reduced model has the ability to accurately predict two important ignition characteristics: ignition time and ignition length. Based on the reduced model results, it is shown that the thermal dispersion [a coupling of transverse diffusion (short-scale) and axial convection (long-scale)] plays a dominant role on ignition.

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New design for efficient diesel particulate trap regeneration

Cited by 10 publications

References 11 publications

Counter‐intuitive temperature excursions during regeneration of a diesel particulate filter

Counter‐intuitive temperature excursions during regeneration of a diesel particulate filter

Ignition analysis of wall-flow monolith diesel particulate filters

Averaging theory for diesel particulate filter regeneration

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