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Soot combustion dynamics in a planar diesel particulate filter / K. Chen in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3323–3330 Titre : Soot combustion dynamics in a planar diesel particulate filter Type de document : texte imprimé Auteurs : K. Chen, Auteur ; K. S. Martirosyan, Auteur ; D. Luss, Auteur Année de publication : 2009 Article en page(s) : pp. 3323–3330 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Soot  combustion  Diesel  particulate  filter  Oxygen  concentrations  IR  imaging Résumé : The dynamic features of soot combustion on a single layer, planar diesel particulate filter (DPF) were studied using IR imaging. At a feed temperature of 635 °C, the soot combustion rate was uniform all over the surface at low oxygen concentrations. At higher oxygen concentrations, local ignition occurred at either one or several locations. The maximum temperature rise of the moving fronts (>100 °C) was much higher than those attained during uniform combustion. The temperature fronts bounding an ignited zone propagated on the surface. Their peak temperature and velocity changed as they moved on the surface. The maximum temperature of a downstream moving front exceeded that of the corresponding one moving upstream. At a soot loading of 10 g/L, a hot zone formed close to the end of the DPF and the bounding temperature front propagated upstream until it conquered the whole surface. At a soot loading of 20 g/L, the position and number of the hot zones strongly depended on the oxygen concentration. In general, increasing either the oxygen concentration or the soot load increased the moving front temperature and velocity. The flow rate affected the location of the ignition point for soot loading of 10 g/L but not for 20 g/L. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8015544 [article] Soot combustion dynamics in a planar diesel particulate filter [texte imprimé] / K. Chen, Auteur ; K. S. Martirosyan, Auteur ; D. Luss, Auteur . - 2009 . - pp. 3323–3330. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3323–3330 Mots-clés : Soot  combustion  Diesel  particulate  filter  Oxygen  concentrations  IR  imaging Résumé : The dynamic features of soot combustion on a single layer, planar diesel particulate filter (DPF) were studied using IR imaging. At a feed temperature of 635 °C, the soot combustion rate was uniform all over the surface at low oxygen concentrations. At higher oxygen concentrations, local ignition occurred at either one or several locations. The maximum temperature rise of the moving fronts (>100 °C) was much higher than those attained during uniform combustion. The temperature fronts bounding an ignited zone propagated on the surface. Their peak temperature and velocity changed as they moved on the surface. The maximum temperature of a downstream moving front exceeded that of the corresponding one moving upstream. At a soot loading of 10 g/L, a hot zone formed close to the end of the DPF and the bounding temperature front propagated upstream until it conquered the whole surface. At a soot loading of 20 g/L, the position and number of the hot zones strongly depended on the oxygen concentration. In general, increasing either the oxygen concentration or the soot load increased the moving front temperature and velocity. The flow rate affected the location of the ignition point for soot loading of 10 g/L but not for 20 g/L. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8015544

Temperature excursions during soot combustion in a diesel particulate filter (DPF) / K. Chen in Industrial & engineering chemistry research, Vol. 49 N° 21 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10358-10363 Titre : Temperature excursions during soot combustion in a diesel particulate filter (DPF) Type de document : texte imprimé Auteurs : K. Chen, Auteur ; K. S. Martirosyan, Auteur ; D. Luss, Auteur Année de publication : 2011 Article en page(s) : pp. 10358-10363 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Combustion  Soot Résumé : A major technological challenge in the operation of diesel particulate filters (DPFs) is prevention of the occasional melting of the ceramic filters during regeneration (combustion of accumulated particulate matter). The cause of this melting is still an established question. Experiments and simulations indicate that during stationary regeneration (fixed feed conditions) the temperature rise is not sufficiently high to cause this melting. We conjecture that the melting is due to a transient temperature excursion caused by a rapid shift of a car from normal driving to idle during regeneration. Infrared imaging was used to follow the response of the spatiotemporal temperature on a planar DPF to sudden changes in the feed conditions. As conjectured, the peak transient temperature was higher than that corresponding to stationary operation under either the initial or final conditions. The amplitude of the temperature excursion was sensitive to the direction in which the temperature front moved and to the period between the initiation of the temperature front and the change in the feed conditions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447927 [article] Temperature excursions during soot combustion in a diesel particulate filter (DPF) [texte imprimé] / K. Chen, Auteur ; K. S. Martirosyan, Auteur ; D. Luss, Auteur . - 2011 . - pp. 10358-10363. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10358-10363 Mots-clés : Combustion  Soot Résumé : A major technological challenge in the operation of diesel particulate filters (DPFs) is prevention of the occasional melting of the ceramic filters during regeneration (combustion of accumulated particulate matter). The cause of this melting is still an established question. Experiments and simulations indicate that during stationary regeneration (fixed feed conditions) the temperature rise is not sufficiently high to cause this melting. We conjecture that the melting is due to a transient temperature excursion caused by a rapid shift of a car from normal driving to idle during regeneration. Infrared imaging was used to follow the response of the spatiotemporal temperature on a planar DPF to sudden changes in the feed conditions. As conjectured, the peak transient temperature was higher than that corresponding to stationary operation under either the initial or final conditions. The amplitude of the temperature excursion was sensitive to the direction in which the temperature front moved and to the period between the initiation of the temperature front and the change in the feed conditions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447927

Wrong-way behavior of soot combustion in a planar diesel particulate filter / K. Chen in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8451–8456 Titre : Wrong-way behavior of soot combustion in a planar diesel particulate filter Type de document : texte imprimé Auteurs : K. Chen, Auteur ; K. S. Martirosyan, Auteur ; D. Luss, Auteur Année de publication : 2010 Article en page(s) : pp. 8451–8456 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Diesel  particulate  filter  Wrong-way  behavior Résumé : Infrared imaging was used to study the impact of a sudden decrease in the exhaust temperature on the spatiotemporal temperature of a single layer planar diesel particulate filter (DPF). The experiments revealed that a sudden decrease in the feed temperature by 100 °C can lead to sudden temperature rise (wrong-way behavior) of about 50 °C above that obtained with the constant original temperature. The transient temperature rise highly depended on the position where the temperature shift was initiated, that is, the time that the moving temperature front stayed in the DPF before exiting it. The temperature excursion near the end of DPF was much higher than the temperature rise in middle or near the entrance. The experiments reveal that the DPF temperature during dynamic operation can exceed in a counterintuitive fashion that obtained under stationary (constant) operating conditions. This suggests that the reported melting of cordierite DPF may have been caused by rapid changes in the feed conditions due to a change in the driving mode, such as a sudden vehicle deceleration. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900848d [article] Wrong-way behavior of soot combustion in a planar diesel particulate filter [texte imprimé] / K. Chen, Auteur ; K. S. Martirosyan, Auteur ; D. Luss, Auteur . - 2010 . - pp. 8451–8456. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8451–8456 Mots-clés : Diesel  particulate  filter  Wrong-way  behavior Résumé : Infrared imaging was used to study the impact of a sudden decrease in the exhaust temperature on the spatiotemporal temperature of a single layer planar diesel particulate filter (DPF). The experiments revealed that a sudden decrease in the feed temperature by 100 °C can lead to sudden temperature rise (wrong-way behavior) of about 50 °C above that obtained with the constant original temperature. The transient temperature rise highly depended on the position where the temperature shift was initiated, that is, the time that the moving temperature front stayed in the DPF before exiting it. The temperature excursion near the end of DPF was much higher than the temperature rise in middle or near the entrance. The experiments reveal that the DPF temperature during dynamic operation can exceed in a counterintuitive fashion that obtained under stationary (constant) operating conditions. This suggests that the reported melting of cordierite DPF may have been caused by rapid changes in the feed conditions due to a change in the driving mode, such as a sudden vehicle deceleration. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900848d