Microstructural Analysis of Deposits on Heavy-Duty EGR Coolers

Lance, Michael J.; Storey, John; Sluder, C. Scott; Meyer, Harry M.; Watkins, Brad M.; Kaiser, M; Ayyappan, Ponnaiyan

doi:10.4271/2013-01-1288

Cited by 18 publications

(2 citation statements)

References 9 publications

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“…As exhaust gas is diluted and cooled, the condensation of hydrocarbons is particularly important inside the EGR system. Condensate, which is mixed with soot particles inside the fouling layer, modifies the microstructure of the soot deposit and changes the characteristics of the deposit, leading to an increase of the density and the thermal conductivity of the fouling layer [40].…”

Section: Fouling Mechanisms In the Egr Systemmentioning

confidence: 99%

Numerical Modelling of Fouling Process in EGR System: A Review

Paz¹,

Suárez²,

Vence³

et al. 2021

Environmental Issues and Sustainable Development

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In order to combat climate change, the new rigorous standards for pollutant reduction have shone a light on the use of exhaust gas recirculation system in order to minimize the NOx emissions of vehicles. For this reason, the fouling problem that appears on the exhaust gas recirculation line, caused by the deposition of soot particles and hydrocarbons that are part of the exhaust gas, has become particularly relevant in the last few years. In this field, researches have proposed numerical models in order to estimate and predict the deposit formation and growth. Using various numerical techniques, they intend to determine and reproduce the fouling layer buildup considering the different mechanisms that are involved in the deposit formation. This chapter provides a detailed and comprehensive account of the numerical approaches that have been proposed to analyze the fouling phenomenon that occurs inside the exhaust gas system. The main characteristics of each numerical model, as well as their main strengths and weaknesses, are exposed and evaluated, and their simulation capabilities are examined in detail.

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Section: Fouling Mechanisms In the Egr Systemmentioning

confidence: 99%

Numerical Modelling of Fouling Process in EGR System: A Review

Paz¹,

Suárez²,

Vence³

et al. 2021

Environmental Issues and Sustainable Development

View full text Add to dashboard Cite

show abstract

“…18–23 Our previous works on hydrocarbon condensation 9,24–26 have shed light on the mechanisms and effects of condensation to some extent. However, some findings are still poorly explained, for example, large particles at the micron level were found in the EGR cooler, 2,27–32 which differs from the typical nanoscale particulate matter in the exhaust gas. Since particle analyzers usually employ inertial separators to remove particles above 1 μm to avoid damage to the measurement equipment by large particles, only the distribution characteristics of nanoscale particles are of interest.…”

Section: Introductionmentioning

confidence: 99%

An original nondestructive sampling method to study the effect of gravity on the deposition of micron-sized large particles in exhaust gas recirculation (EGR) cooler fouling

Yao,

Han,

Tian

et al. 2023

International Journal of Engine Research

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Fouling is one of the barriers to developing more efficient and near-zero emission internal combustion engines. The micron-sized particulate matter is one of the roots of this fouling phenomenon in exhaust gas recirculation (EGR) coolers. This fouling is inadequately evaluated quantitatively, and its deposition mechanism is unknown. To investigate the effect of gravity on the deposition of micron-sized particles, an original nondestructive sampling fouling method and experiment apparatus have been developed to effectively obtain the upper and lower bottom fouling in the cooler in the direction of airflow, and the area proportion, count, and diameter of large particles in the fouling using image processing software. It was found that (i) the area proportion of large particles in the lower bottom fouling was almost 2.5 times higher than the upper bottom fouling; (ii) the count of large particles in the lower bottom fouling was higher, and the maximum diameter was larger, up to 639 μm; (iii) the mass of the lower bottom fouling was 1.5 times higher than the upper bottom fouling; (iv) gravity can significantly promote the deposition of micron-sized particles and should be considered in the design and arrangement of the EGR cooler to prevent fouling.

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Effect of Hydrocarbon Concentration on Particulate Deposition and Microstructure of the Deposit in Exhaust Gas Recirculation Cooler

Zhang

et al. 2022

Int.J Automot. Technol.

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Microstructural Analysis of Deposits on Heavy-Duty EGR Coolers

Cited by 18 publications

References 9 publications

Numerical Modelling of Fouling Process in EGR System: A Review

Numerical Modelling of Fouling Process in EGR System: A Review

An original nondestructive sampling method to study the effect of gravity on the deposition of micron-sized large particles in exhaust gas recirculation (EGR) cooler fouling

Effect of Hydrocarbon Concentration on Particulate Deposition and Microstructure of the Deposit in Exhaust Gas Recirculation Cooler

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