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

Yunjing Jiao

Yunjing Jiao

Department of Mechanical and Electrical Engineering, North China Institute of Aerospace EngineeringLangfang, China
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Jiao, Yunjing
 y 
Qingping Zheng

Qingping Zheng

School of Energy and Environmental Engineering, Hebei University of TechnologyTianjin, China
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Zheng, Qingping
  
08 may 2020
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Publicado en línea: 08 may 2020
Páginas: 129 - 142
Recibido: 27 dic 2019
Aceptado: 01 feb 2020
DOI: https://doi.org/10.2478/amns.2020.2.00004
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© 2020 Yunjing Jiao et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Fig. 1

Diagram of the principle of SCR system.
Diagram of the principle of SCR system.

Fig. 2

Catalytic converter
Catalytic converter

Fig. 3

Evaporation of droplet and pyrolysis of urea.
Evaporation of droplet and pyrolysis of urea.

Fig. 4

Comparison of catalytic conversion rate between calculation and test.
Comparison of catalytic conversion rate between calculation and test.

Fig. 5

Urea nozzle.
Urea nozzle.

Fig. 6

Particle distribution at different injection angles (Y section)
Particle distribution at different injection angles (Y section)

Fig. 7

Temperature distribution at different injection angles (Y section).
Temperature distribution at different injection angles (Y section).

Fig. 8

Mass-fraction of NH3 in Inlet cross section of carrier at different injection angle
Mass-fraction of NH3 in Inlet cross section of carrier at different injection angle

Fig. 9

Distribution uniformity of NH3 in the inlet section of catalytic carrier.
Distribution uniformity of NH3 in the inlet section of catalytic carrier.

Fig. 10

Comparison of wallfilm mass at different injection angles.
Comparison of wallfilm mass at different injection angles.

Fig. 11

Particle distribution with different nozzle diameters (Y cross section).
Particle distribution with different nozzle diameters (Y cross section).

Fig. 12

Wall film mass comparison diagram under different nozzle diameter.
Wall film mass comparison diagram under different nozzle diameter.

Fig. 13

Mass-fraction of NH3 at different entry diameter.
Mass-fraction of NH3 at different entry diameter.

Fig. 14

Uniformity of NH3 in inlet section of catalytic carrier under different nozzle diameters.
Uniformity of NH3 in inlet section of catalytic carrier under different nozzle diameters.

Fig. 15

Engine post treatment test bench.
Engine post treatment test bench.

Fig. 16

Comparison of NOx conversion efficiency.
Comparison of NOx conversion efficiency.

Boundary condition of typical working condition

pointRotation (r/min)Exhaust temperature(°C)Gas mass (kg/h)urea injection (ml/h)NOX concentration (10e−6)
A1001349477811.7733001660
B10016724401190.8634001230
C10019944121430.113200950
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