<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The kinetic mechanism of chemical reaction was used to calculate the coupling of the fluid kinetics with the urea decomposition reaction and the SCR reaction kinetics. Combined with the engine test and simulation, the distribution uniformity of the urea injection and ammonia gas was studied. Through numerical simulation on urea spray and exhaust flow in Urea-SCR system, the flow field characteristics in whole after-treatment system are gotten. By using numerical calculation in different urea injection angle and orifice sizes, the urea-crystallization and ammonia distribution have been studied and the optimal urea spray angle and nozzle size are given.</p></abstract>

The kinetic mechanism of chemical reaction was used to calculate the coupling of the fluid kinetics with the urea decomposition reaction and the SCR reaction kinetics. Combined with the engine test and simulation, the distribution uniformity of the urea injection and ammonia gas was studied. Through numerical simulation on urea spray and exhaust flow in Urea-SCR system, the flow field characteristics in whole after-treatment system are gotten. By using numerical calculation in different urea injection angle and orifice sizes, the urea-crystallization and ammonia distribution have been studied and the optimal urea spray angle and nozzle size are given.

Urea Injection and Uniformity of Ammonia Distribution in SCR System of Diesel Engine

Department of Mechanical and Electrical Engineering

School of Energy and Environmental Engineering

Applied Mathematics and Nonlinear Sciences

This work is licensed under the Creative Commons Attribution 4.0 International License.

The kinetic mechanism of chemical reaction was used to calculate the coupling of the fluid kinetics with the urea decomposition reaction and the SCR reaction...

point	Rotation (r/min)	Exhaust temperature(°C)	Gas mass (kg/h)	urea injection (ml/h)	NO_X concentration (10^e−6)
A100	1349	477	811.77	3300	1660
B100	1672	440	1190.86	3400	1230
C100	1994	412	1430.11	3200	950

Urea Injection and Uniformity of Ammonia Distribution in SCR System of Diesel Engine

Publié en ligne: 08 mai 2020

Pages: 129 - 142

Reçu: 27 déc. 2019

Accepté: 01 févr. 2020

DOI: https://doi.org/10.2478/amns.2020.2.00004

Mots clés
Urea-SCR system, spray parameter, ammonia concentration distribution, uniformity

© 2020 Yunjing Jiao et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

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Boundary condition of typical working condition

Urea Injection and Uniformity of Ammonia Distribution in SCR System of Diesel Engine

Publié en ligne: 08 mai 2020

Pages: 129 - 142

Reçu: 27 déc. 2019

Accepté: 01 févr. 2020

DOI: https://doi.org/10.2478/amns.2020.2.00004

Mots clésUrea-SCR system, spray parameter, ammonia concentration distribution, uniformity

© 2020 Yunjing Jiao et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Fig. 10

Fig. 11

Fig. 12

Fig. 13

Fig. 14

Fig. 15

Fig. 16

Boundary condition of typical working condition

Mots clés
Urea-SCR system, spray parameter, ammonia concentration distribution, uniformity