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Experimental and 3D, embedded modeling for diesel engine SCR deposit

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Abstract

Nowadays, the selective catalytic reduction (SCR) is a promising solution to fulfill stringent nitrogen oxide (NOX) emission standards enforced by worldwide regulation bodies for lean burning engines. However, in the practical operation, urea deposits occur under unfavorable conditions, which bring about a failure of urea dosing strategy, affect the SCR system de-NOx performance and lowering the fuel economy by increasing the engine back pressure. This paper will present 3D deposit model, which can be used to predict the deposit position. Furthermore, a model-based controls strategy and calibration are designed. The comparison test results of both engine emission tests and vehicle field tests shows there is significant deposits improvement with the embedded model.

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Abbreviations

SCR:

selected catalyst reduction

NOx :

nitrogen oxide

Adblue:

32.5 % urea solution

SV:

space velocity

CYA:

cyanuric acid

NSR:

NH3/NOX ratio

DCU:

dosing control unit

ETC:

european transient cycle

F idr :

drag force

F ip :

pressure force

A:

frequency factor

D d :

droplet diameter

E a :

activation energy

R:

universal gas constant

Red :

reynolds number

c HCNO :

concentration of HCNO

Area filmpatch :

film patch area

St :

stanton number

m Deposit :

mass of deposits

m f,lowTemp :

mass of wallfilm with low temperature

w urea :

urea mass fraction in the wallfilm

w miler :

limitation of Miller curve.

m Inj :

mass of the injected Adblue

x stored :

percentage of injected Adblue to wallfilm

m evap :

the mass of evaporated water

m de :

urea mass which involved in themolysis reaction

Pf :

wallfilm density

Vf :

the wallfilm volume

Af :

the wallfilm area

K:

heat transfer coefficient.

c p,f :

wallfilm specific heat

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Authors and Affiliations

  1. Key Laboratory of High Performance Ship of Ministry of Education, Wuhan University of Technology, Hubei, 430063, China

    F. Qian, L. Lü, T. Feng & D. Yang

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  1. F. Qian
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  2. L. Lü
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  3. T. Feng
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  4. D. Yang
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Correspondence to F. Qian.

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Qian, F., Lü, L., Feng, T. et al. Experimental and 3D, embedded modeling for diesel engine SCR deposit. Int.J Automot. Technol. 18, 219–227 (2017). https://doi.org/10.1007/s12239-017-0021-9

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  • DOI: https://doi.org/10.1007/s12239-017-0021-9

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