Documents disponibles écrits par cet auteur

Inlet cone effect on diesel particulate filter regeneration upon a rapid shift to idle / Mengting Yu in Industrial & engineering chemistry research, Vol. 51 N° 35 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11355–11366 Titre : Inlet cone effect on diesel particulate filter regeneration upon a rapid shift to idle Type de document : texte imprimé Auteurs : Mengting Yu, Auteur ; Dan Luss, Auteur Année de publication : 2012 Article en page(s) : pp. 11355–11366 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Diesel  engine Résumé : The particulate matter (PM) emitted by a diesel engine is collected and then burned in a diesel particulate filter (DPF). A major technological challenge in the operation of the ceramic, often cordierite, filter is that a rapid shift to idle may create a local hot region with a temperature much higher than under stationary feed conditions. This excessive transient temperature rise may cause local melting or cracking of the ceramic filter. Almost all previous studies of temperature excursions during the DPF regeneration (combustion of the deposited PM) were of cases in which equal exhaust flow rate was fed to all the parallel inlet channels. The diesel engine exhaust pipe is sometimes connected to the DPF by a wide-angled cone (diffuser). This leads to a mal-distribution of the flow rate to the inlet channels and of the deposited PM. Simulations revealed that following a rapid shift to idle the highest regeneration temperature in a DPF fed by a cone exceeded that in one not fed by a cone and it may exceed the cordierite DPF melting temperature (1200 °C). Moreover, it may generate transient radial and axial temperature gradients several times higher than under stationary regeneration that may crack the cordierite DPF. The increase in the temperature gradient is especially large in the axial direction. One of the surprising findings is that the highest temperature attained following a step change to idle is not a monotonic function of the initial PM loading. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300948c [article] Inlet cone effect on diesel particulate filter regeneration upon a rapid shift to idle [texte imprimé] / Mengting Yu, Auteur ; Dan Luss, Auteur . - 2012 . - pp. 11355–11366. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11355–11366 Mots-clés : Diesel  engine Résumé : The particulate matter (PM) emitted by a diesel engine is collected and then burned in a diesel particulate filter (DPF). A major technological challenge in the operation of the ceramic, often cordierite, filter is that a rapid shift to idle may create a local hot region with a temperature much higher than under stationary feed conditions. This excessive transient temperature rise may cause local melting or cracking of the ceramic filter. Almost all previous studies of temperature excursions during the DPF regeneration (combustion of the deposited PM) were of cases in which equal exhaust flow rate was fed to all the parallel inlet channels. The diesel engine exhaust pipe is sometimes connected to the DPF by a wide-angled cone (diffuser). This leads to a mal-distribution of the flow rate to the inlet channels and of the deposited PM. Simulations revealed that following a rapid shift to idle the highest regeneration temperature in a DPF fed by a cone exceeded that in one not fed by a cone and it may exceed the cordierite DPF melting temperature (1200 °C). Moreover, it may generate transient radial and axial temperature gradients several times higher than under stationary regeneration that may crack the cordierite DPF. The increase in the temperature gradient is especially large in the axial direction. One of the surprising findings is that the highest temperature attained following a step change to idle is not a monotonic function of the initial PM loading. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300948c

Inlet cone effect on particulate matter deposition and regeneration temperature in a diesel particulate filter / Mengting Yu in Industrial & engineering chemistry research, Vol. 51 N° 9 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3791-3800 Titre : Inlet cone effect on particulate matter deposition and regeneration temperature in a diesel particulate filter Type de document : texte imprimé Auteurs : Mengting Yu, Auteur ; Dan Luss, Auteur Année de publication : 2012 Article en page(s) : pp. 3791-3800 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Diesel  particulate Résumé : A diesel particulate filter (DPF) is used to remove particulate matter (PM) from the effluent of a diesel engine. A major technological challenge in the operation of the ceramic cordierite filter is to prevent formation of local high temperatures that can melt the DPF or generate a thermal stress that may cause cracking. Most previous studies of the temperature rise during the DPF periodic regeneration (combustion of the deposited PM) considered cases in which the inlet velocity to all the parallel channels was uniform. A wide-angled cone (diffuser) is sometimes used to connect the diesel engine exhaust pipe to the DPF leading to a nonuniform velocity to the inlet channels, with the highest attained at the DPF center. We used a PM deposition and regeneration computational model to investigate the impact of the inlet cone on the DPF behavior under stationary feed conditions. The cone led to mal-distribution of the deposited PM, with the highest thickness in the DPF center. The highest regeneration temperature when using an inlet cone may be quite higher than when it is absent. Moreover, the inlet cone can generate higher temperature gradients and the resulting thermal stresses may crack the ceramic support. The largest radial thermal gradients are encountered dose to the wall in the downstream section of DPF, shortly after the temperature inside the filter reaches its peak. The cone leads to a slightly faster regeneration than when it is not used. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202226r [article] Inlet cone effect on particulate matter deposition and regeneration temperature in a diesel particulate filter [texte imprimé] / Mengting Yu, Auteur ; Dan Luss, Auteur . - 2012 . - pp. 3791-3800. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3791-3800 Mots-clés : Diesel  particulate Résumé : A diesel particulate filter (DPF) is used to remove particulate matter (PM) from the effluent of a diesel engine. A major technological challenge in the operation of the ceramic cordierite filter is to prevent formation of local high temperatures that can melt the DPF or generate a thermal stress that may cause cracking. Most previous studies of the temperature rise during the DPF periodic regeneration (combustion of the deposited PM) considered cases in which the inlet velocity to all the parallel channels was uniform. A wide-angled cone (diffuser) is sometimes used to connect the diesel engine exhaust pipe to the DPF leading to a nonuniform velocity to the inlet channels, with the highest attained at the DPF center. We used a PM deposition and regeneration computational model to investigate the impact of the inlet cone on the DPF behavior under stationary feed conditions. The cone led to mal-distribution of the deposited PM, with the highest thickness in the DPF center. The highest regeneration temperature when using an inlet cone may be quite higher than when it is absent. Moreover, the inlet cone can generate higher temperature gradients and the resulting thermal stresses may crack the ceramic support. The largest radial thermal gradients are encountered dose to the wall in the downstream section of DPF, shortly after the temperature inside the filter reaches its peak. The cone leads to a slightly faster regeneration than when it is not used. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202226r