Diesel Soot Oxidation under Controlled Conditions

Song, Huan; Ladommatos, Nicos; Zhao, Hua

doi:10.4271/2001-01-3673

Cited by 5 publications

(3 citation statements)

References 53 publications

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“…While the investigation found the oxidation rate dependent on O2 partial pressure, it is unclear what role other oxidants, such as OH, present in the flame environment played in the particle oxidation. One significant limitation evident in the previous studies of diesel particle oxidation, with the exception of the work by Song et al (13), is the limited range of temperatures investigated. In many cases, the temperature is limited by the onset of particle ignition due to excessive heating of the immobilized bed, and the maximum temperature reported for relevant previous studies is 700 °C.…”

Section: Introductionmentioning

confidence: 99%

“…The kinetics of soot oxidation has been studied extensively in the past using a variety of materials and techniques (). Early work used carbon filaments () and carbon or graphite rods ( , ), while later work used various carbon blacks ( , ) or soot generated in a flame or engine ( − ). Most previous studies that have utilized flame- or engine-generated soot have relied on collecting and immobilizing the soot ( − ) or light scattering or absorption within a flame environ ment ().…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Diesel Nanoparticle Oxidation

Higgins

Jung

Kittelson

et al. 2003

Environ. Sci. Technol.

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The technique of high-temperature oxidation tandem differential mobility analysis has been applied to the study of diesel nanoparticle oxidation. The oxidation rates in air of diesel nanoparticles sampled directly from the exhaust stream of a medium-duty diesel engine were measured over the temperature range of 800-1140 degrees C using online aerosol techniques. Three particle sizes (40, 90, and 130 nm mobility diameter) generated under engine load conditions of 10, 50, and 75% were investigated. The results show significant differences in the behavior of the 10% load particles as compared to the 50 and 75% load particles. The 10% load particles show greater size decrease at temperatures below 500 degrees C and significant size decrease at temperatures between 500 and 1000 degrees C in a non-oxidative environment, indicating release of adsorbed volatile material or thermally induced rearrangement of the agglomerate structure. Activation energies determined are 114, 109, and 108 kJ mol(-1) for the 10, 50, and 75% load particles, respectively. These activation energies are lower than for flame soot (Higgins et al. J. Phys. Chem. A 2002, 106, 96), but the preexponential factors are lower by 3 orders of magnitude, and the overall oxidation rates are slower by up to a factor of 4 over the temperature range studied. Possible reasons for the differences are discussed in the text.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetics of Diesel Nanoparticle Oxidation

Higgins

Jung

Kittelson

et al. 2003

Environ. Sci. Technol.

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show abstract

“…The surface-specific soot oxidation rates obtained in this study and some other published data were plotted on the Arrhenius map as shown in Figure 15. Three lines denoted as N–S-C are the soot oxidation rates at different O 2 partial pressures proposed by N–S-C. 3 Song et al 35 investigated oxidation of diesel exhaust soot using a flat flame burner and found the oxidation rates fallen in domains predicted by the N–S-C formula in a temperature range between 1530 and 1820 K. The hollow circles are the plots from Fenimore and Jones 36 experiment conducted in a temperature range between 1530 and 1890 K. They suggested the importance of the oxidation by OH even in this low-temperature range. Lighty et al 37 also urged that soot oxidation by O 2 is predominant under lean conditions while oxidation by OH plays significant contribution to soot burnout in fuel-rich cases under similar temperature range.…”

Section: Surface-specific Soot Oxidation Ratementioning

confidence: 99%

Diesel flame imaging and quantitative analysis of in-cylinder soot oxidation

Kamimoto

Uchida²,

Aizawa

et al. 2016

International Journal of Engine Research

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This study concerns a quantitative analysis of late-cycle soot oxidation in diesel engines that focuses on two-dimensional KL factor images obtained by the two-color method. The spatially integrated KL factor was converted into the in-cylinder soot mass using a new formula of diesel soot emissivity. This methodology was applied to two combustion systems: a heavy-duty optical engine which was tuned for a higher fuel-air mixing capability and a rapid compression and expansion machine which had a lower mixing performance. The in-cylinder soot mass history during the last stage of soot oxidation phase was converted into a normalized soot mass history and was used for comparison with simulated soot mass history. A model calculation of in-cylinder soot mass history which was based on oxidation of a primary soot particle was performed with the surface-specific soot oxidation rate as a parameter. A value of the surface-specific soot oxidation rate was specified from the curve fitting approach between the experimental and simulated in-cylinder soot mass traces. The resultant soot oxidation rates plotted on the Arrhenius diagram were found to lie in domains with different oxidation mechanisms. The reason for the scattered plots was discussed referring to model predictions of soot oxidation in the literature, and it was concluded that the higher oxidation rates could be attributed to well-mixed soot oxidizer structure.

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Combustion, emissions, and calibration for diesel engine system design

Xin¹

2013

Diesel Engine System Design

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Diesel Soot Oxidation under Controlled Conditions

Cited by 5 publications

References 53 publications

Kinetics of Diesel Nanoparticle Oxidation

Kinetics of Diesel Nanoparticle Oxidation

Diesel flame imaging and quantitative analysis of in-cylinder soot oxidation

Combustion, emissions, and calibration for diesel engine system design

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