Chemical Kinetics Modelling of Exhaust After-Treatment System: A One Dimensional Simulation Approach

Krishna, K Vamshi; Chauhan, Nitin; Patel, Brijesh; Shrivastava, Manish

doi:10.4271/2019-26-0249

Cited by 2 publications

(1 citation statement)

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“…NO 2 reduction to NO by both CO and C 3 H 6 at low exhaust gas temperatures over a Pt/Al 2 O 3 catalyst was reported in some study. [26][27][28] It should be noted that in most of the experiments conducted on flow reactors, NO 2 was not present in the artificial exhaust gases and therefore, NO 2 reduction with CO and hydrocarbon was not reported. [23][24][25]29 From the literature survey on numerical modelling of DOCs, it was found that the low temperature NO 2 reduction to NO was not considered for actual exhaust condition, therefore, accurate predictions of the DOC performance at low exhaust gas temperatures with real engine exhaust conditions were compromised.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling and non-dimensional analysis of a diesel oxidation catalyst with focus on NO₂ reduction

Suman,

Khedkar,

Sarangi

et al. 2024

International Journal of Engine Research

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A diesel oxidation catalyst (DOC) is widely used to oxidize partial combustion by-products, such as unburned hydrocarbons and carbon monoxide (CO), and nitric oxide (NO) from compression ignition (CI) engines. Numerical modelling of the DOC, reported in the literature, often does not predict the performance of the DOC accurately over a wide range of engine operating conditions because only a few chemical reactions are considered. The objective of this work is to develop a robust 1D transient numerical model, capable of accurately predicting the conversion efficiency of the engine-out total hydrocarbon (THC), CO and NO in a conventional diesel combustion mode. Based on experimental observations of the low temperature oxidation of CO and THC with nitrogen dioxide (NO2), the developed numerical model not only include oxidation reactions with oxygen but also the NO2 reduction and selective catalytic reduction (SCR) reactions to improve the robustness of the model. From the non-dimensional analysis, the kinetics and mass transfer limitation of exhaust gas species oxidation and their dependence on exhaust gas properties and DOC geometric parameters are identified. Relative magnitudes of resistances to chemical reaction and mass transfer reveal that CO oxidation in the DOC transitions from kinetically controlled to a mass transfer-controlled regime at the CO oxidation light-off temperature (218°C DOC inlet temperature), whereas, THC oxidation is in the kinetic controlled regime even at 377°C exhaust gas temperature. NO2 reduction in the DOC is always in the kinetic controlled regime; however, NO oxidation reaction transitions from kinetic to a mass transfer-controlled regime at 215°C.

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Section: Introductionmentioning

confidence: 99%

Numerical modelling and non-dimensional analysis of a diesel oxidation catalyst with focus on NO₂ reduction

Suman,

Khedkar,

Sarangi

et al. 2024

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

Concept Based Evaluation and Development of Close-Coupled DOC through Model in Loop Simulation Supported by Experimental Investigations on 3L Light & amp; Medium Duty BS - VI Diesel Engine

R¹,

Chaurasia²,

Lakhlani³

et al. 2022

SAE Technical Paper Series

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Chemical Kinetics Modelling of Exhaust After-Treatment System: A One Dimensional Simulation Approach

Cited by 2 publications

References 10 publications

Numerical modelling and non-dimensional analysis of a diesel oxidation catalyst with focus on NO₂ reduction

Numerical modelling and non-dimensional analysis of a diesel oxidation catalyst with focus on NO₂ reduction

Concept Based Evaluation and Development of Close-Coupled DOC through Model in Loop Simulation Supported by Experimental Investigations on 3L Light & amp; Medium Duty BS - VI Diesel Engine

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Chemical Kinetics Modelling of Exhaust After-Treatment System: A One Dimensional Simulation Approach

Cited by 2 publications

References 10 publications

Numerical modelling and non-dimensional analysis of a diesel oxidation catalyst with focus on NO2 reduction

Numerical modelling and non-dimensional analysis of a diesel oxidation catalyst with focus on NO2 reduction

Concept Based Evaluation and Development of Close-Coupled DOC through Model in Loop Simulation Supported by Experimental Investigations on 3L Light & amp; Medium Duty BS - VI Diesel Engine

Contact Info

Product

Resources

About

Numerical modelling and non-dimensional analysis of a diesel oxidation catalyst with focus on NO₂ reduction

Numerical modelling and non-dimensional analysis of a diesel oxidation catalyst with focus on NO₂ reduction