Research on Simulation of Urea-SCR Injection System for Marine Diesel Engine

2013 ◽  
Vol 860-863 ◽  
pp. 1807-1811
Author(s):  
You Hong Xiao ◽  
Zhen Hao Chu ◽  
Xin Na Tian
Keyword(s):  
Catalytic Reduction ◽  
Water Solution ◽  
Spray Angle ◽  
Injection System ◽  
Marine Diesel Engine ◽  
Exhaust Gas ◽  
Marine Diesel ◽  
Nozzle Hole ◽  
Simulation Results ◽  
Hole Number

The mixing degree of ammonia and exhaust gas has significant effect on the NOx conversion efficiency of SCR (selective catalytic reduction) system. It is essential to investigate the structure of urea nozzle since it considerably impacts the atomization of urea water solution. This paper simulated the process of urea spray by the software FIRE and analyzed the influence of spray characteristics such as nozzle hole number, nozzle hole chamfering as well as the spray angle on the atomization of urea water solution. Simulation results can indicate the optimal nozzle for a certain circumstance which is beneficial to the engineering design.

3-D Numerical Study of Effect of Flow Parameters upon the Uniformity of NH3 in Urea-SCR

2012 ◽  
Vol 505 ◽  
pp. 175-179 ◽  
Author(s):  
R. Vikas ◽  
J.M. Mallikarjuna ◽  
V. Ganesan
Keyword(s):  
Catalytic Reduction ◽  
Numerical Study ◽  
Water Solution ◽  
Injection Pressure ◽  
Exhaust Gas ◽  
Oxides Of Nitrogen ◽  
Lean Burn ◽  
Flow Parameters ◽  
Ammonia Slip ◽  
Engine Emission

Nowadays, due to the stringent engine emission norms, an efficient technique is required to reduce oxides of nitrogen (NOX) from automobiles especially from the lean burn engines. Although Urea Selective Catalytic Reduction (SCR) is capable of satisfying these norms, the ammonia slip nullifies its advantages. Ammonia slip is mainly due to the lack of uniformity of ammonia at the monolith entrance. The uniformity of ammonia distribution mainly depends upon the flow parameters of exhaust gas and the injection parameters of urea water solution. The current study addresses the effect of flow parameters, temperature and flow rate of exhaust gas on the injection pressure. The results obtained reveals useful guidelines for enhancing the uniformity of ammonia in Urea-SCR.

scholarly journals Effects of injection pressure on cavitation and spray in marine diesel engine

2016 ◽  
Vol 9 (3) ◽  
pp. 186-198 ◽  
Author(s):  
Fei Yan ◽  
Yuchen Du ◽  
Lihui Wang ◽  
Wenxian Tang ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Bubble Dynamics ◽  
Pressure Fluctuations ◽  
Injection Pressure ◽  
Spray Angle ◽  
Marine Diesel Engine ◽  
Sauter Mean Diameter ◽  
Two Phase ◽  
Marine Diesel ◽  
Single Bubble Dynamics

Numerical simulation of the cavitation and spray in a marine diesel engine is performed to investigate the effects of injection pressure on the cavitation flow and spray characteristics in the marine diesel engine, which in turn influence atomization and combustion in the cylinder. A two-phase flow model combined with single bubble dynamics and a droplet break-up model are used to simulate cavitation and spray, respectively, and the results are compared to the experimental data. With increasing injection pressure, the pressure fluctuations inside the nozzle become more intense. The spray penetration is proportional to time at the beginning of injection. Higher injection pressure increases the spray angle. In addition, massive structures on spray edge can return to the spray body, whereas the massive structures on the spray head remain unchanged throughout its lifetime. Each additional 20 MPa of injection pressure reduces the Sauter mean diameter by approximately 9%.

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