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Journals
Applied Mathematics and Nonlinear Sciences
Volume 5 (2020): Issue 2 (July 2020)
Open Access
Urea Injection and Uniformity of Ammonia Distribution in SCR System of Diesel Engine
Yunjing Jiao
Yunjing Jiao
and
Qingping Zheng
Qingping Zheng
| May 08, 2020
Applied Mathematics and Nonlinear Sciences
Volume 5 (2020): Issue 2 (July 2020)
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Published Online:
May 08, 2020
Page range:
129 - 142
Received:
Dec 27, 2019
Accepted:
Feb 01, 2020
DOI:
https://doi.org/10.2478/amns.2020.2.00004
Keywords
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.
Fig. 1
Diagram of the principle of SCR system.
Fig. 2
Catalytic converter
Fig. 3
Evaporation of droplet and pyrolysis of urea.
Fig. 4
Comparison of catalytic conversion rate between calculation and test.
Fig. 5
Urea nozzle.
Fig. 6
Particle distribution at different injection angles (Y section)
Fig. 7
Temperature distribution at different injection angles (Y section).
Fig. 8
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.
Fig. 10
Comparison of wallfilm mass at different injection angles.
Fig. 11
Particle distribution with different nozzle diameters (Y cross section).
Fig. 12
Wall film mass comparison diagram under different nozzle diameter.
Fig. 13
Mass-fraction of NH3 at different entry diameter.
Fig. 14
Uniformity of NH3 in inlet section of catalytic carrier under different nozzle diameters.
Fig. 15
Engine post treatment test bench.
Fig. 16
Comparison of NOx conversion efficiency.
Boundary condition of typical working condition
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