Application Guideline to Define Catalyst Layout for Maximum Catalytic Efficiency

Marsh, Per; Acke, Filip; Konieczny, Roman; Brück, Rolf; Hirth, Peter

doi:10.4271/2001-01-0929

Cited by 22 publications

(11 citation statements)

References 5 publications

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“…This makes physical sense, as those physical parameters have the most to do with the thermal characteristics of the catalyst monolith (thermal mass). The sensitivity analysis matches the general intuition of catalyst engineering 5 , where the designs have tended toward long, thin tubes, as opposed to boxes or more square cylinders or ovoid shapes. The one aspect of this model that was not tested was the pressure drop across the catalyst.…”

Section: Single Objective Optimization and Sensitivity Analysissupporting

confidence: 60%

A Modular State-Vector Based Modeling Architecture for Diesel Exhaust System Design, Analysis and Optimization

Graff¹,

Weck²

2006

11th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference

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Diesel emission regulations for cars and trucks are becoming ever more stringent, and it is important to be able to evaluate the performance of new after-treatment technologies and architectures and their effects on the powertrain and vehicle. This paper presents a new modeling and simulation methodology that treats the entire exhaust system, not just one component. In order to achieve this, a modeling architecture is developed based on a statevector platform where component sub-models can be easily developed and integrated, forming a larger system which can simulate vehicle operations. The innovation presented in this paper is the modular simulation architecture that allows investigation of a large number of different system architectures without having to manually parameterize each configuration. The system model can then be used as the basis from which multidisciplinary, multi-objective, system-wide analysis can be performed. The framework is applied to the optimization of a commercial vehicle diesel exhaust treatment system, including a diesel oxidation catalyst and other components.

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Section: Single Objective Optimization and Sensitivity Analysissupporting

confidence: 60%

A Modular State-Vector Based Modeling Architecture for Diesel Exhaust System Design, Analysis and Optimization

Graff¹,

Weck²

2006

11th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference

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“…from the catalyst into the environment cvu from gas to the material f flange g gas c catalyst gi gas inlet k end m material of pipe mc -Material of catalyst m 1 at the beginning pipe m 2 on the middle pipe m 3 at the end pipe pg gas at constant pressure Acronym CSPcold start phase, from the catalyst into the environment cvu from gas to the material f flange g gas c catalyst gi gas inlet k end m material of pipe mc -Material of catalyst m 1 at the beginning pipe m 2 on the middle pipe m 3 at the end pipe pg gas at constant pressure Acronym CSPcold start phase,…”

Section: Acknowledgmentsmentioning

confidence: 99%

Experimental verification of mathematical model of the heat transfer in exhaust system

Petkovic¹,

Pešić²,

Lukić³

2011

THERM SCI

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A Catalyst convertor has maximal efficiency when it reaches working temperature. In a cold start phase efficiency of the catalyst is low and exhaust emissions have high level of air pollutants. The exhaust system optimization, in order to decrease time of achievement of the catalyst working temperature, caused reduction of the total vehicle emission. Implementation of mathematical models in development of exhaust systems decrease total costs and reduce time. Mathematical model has to be experimentally verified and calibrated, in order to be useful in the optimization process. Measurement installations have been developed and used for verification of the mathematical model of unsteady heat transfer in exhaust systems. Comparisons between experimental results and the mathematical model are presented in this paper. Based on obtained results, it can be concluded that there is a good agreement between the model and the experimental results

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“…According to references, 60% to 80% of the total CO and HC emission is emitted during this period. At lower environmental temperatures, below 0 °C, this value is 95% to 98% [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in exhaust system of a cold start engine at low environmental temperature

Petkovic¹,

Pešić²,

Lukic³

2010

THERM SCI

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During the engine cold start, there is a significantly increased emission of harmful engine exhaust gases, particularly at very low environmental temperatures. Therefore, reducing of emission during that period is of great importance for the reduction of entire engine emission. This study was conducted to test the activating speed of the catalyst at low environmental temperatures. The research was conducted by use of mathematical model and developed computer programme for calculation of non-stationary heat transfer in engine exhaust system. During the research, some of constructional parameters of exhaust system were adopted and optimized at environmental temperature of 22 C. The combination of design parameters giving best results at low environmental temperatures was observed. The results showed that the temperature in the environment did not have any significant influence on pre-catalyst light-off time.

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Application Guideline to Define Catalyst Layout for Maximum Catalytic Efficiency

Cited by 22 publications

References 5 publications

A Modular State-Vector Based Modeling Architecture for Diesel Exhaust System Design, Analysis and Optimization

A Modular State-Vector Based Modeling Architecture for Diesel Exhaust System Design, Analysis and Optimization

Experimental verification of mathematical model of the heat transfer in exhaust system

Heat transfer in exhaust system of a cold start engine at low environmental temperature

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