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http://dx.doi.org/10.15435/JILASSKR.2019.24.2.51

Study on Ammonia Uniformity and DeNOx Analysis in the Urea-SCR System for Construction Machinery  

Kim, Donghwan (한양대학교 대학원 융합기계공학과)
Park, Junkyu (한양대학교 부설 산업과학연구소)
Kang, Joung-ho (자동차부품연구원)
Moon, Seonjoon (자동차부품연구원)
Park, Sungwook (한양대학교 기계공학부)
Publication Information
Journal of ILASS-Korea / v.24, no.2, 2019 , pp. 51-57 More about this Journal
Abstract
In this study, the spray atomization characteristics of urea injector used in SCR system for construction machinery was analyzed, and the uniformity index at the front of mixer and NOx conversion efficiency were evaluated through numerical analysis. Spray visualization and droplet size/velocity measurement were performed and the measured results were used to verify the spray analysis model to calculate the uniformity index in the exhaust gas after-treatment system. For the flow analysis, STAR-CCM, a three-dimensional CFD, was used and the uniformity index of the SCR system at the front of the mixer was calculated using the droplet dissociation model and the wall collision model. Finally, the DeNOx performance for the average condition of the NRTC driving mode was calculated to understand the NOx conversion efficiency reflecting the exhaust gas temperature. The simulation results show that the uniformity index at the front of mixer was calculated as 0.862 and DeNOx efficiency was 75.9%.
Keywords
Urea-SCR; Urea injector; Spray characteristics; Ammonia uniformity index;
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1 R. K. Miller, W. C. Haberkamp, K. M. Badeau, Z. G. Liu, R. C. Shirk, and T. Wood, "Design, development and performance of a composite diesel particulate filter", SAE Technical Paper0148-7191, 2002.
2 A. G. Konstandopoulos, M. Kostoglou, E. Skaperdas, E. Papaioannou, D. Zarvalis, and E. Kladopoulou, "Fundamental studies of diesel particulate filters: transient loading, regeneration and aging", SAE Technical Paper0148-7191, 2000.
3 J. H. Johnson, S. T. Bagley, L. D. Gratz, and D. G. Leddy, "A review of diesel particulate control technology and emissions effects-1992 horning memorial award lecture", SAE Transactions, pp. 210-244, 1994.
4 J. Oh and K. Lee, "Spray characteristics of a urea solution injector and optimal mixer location to improve droplet uniformity and NOx conversion efficiency for selective catalytic reduction", Fuel, Vol. 119, pp. 90-97, 2014.   DOI
5 A. Spiteri et al., "Comparative analysis on the performance of pressure and air-assisted urea injection for selective catalytic reduction of NOx", Fuel, Vol. 161, pp. 269-277, 2015.   DOI
6 D. Ju, J. Fang, T. Zhang, X. Qiao, J. Xiao, and Z. Huang, "High-speed shadow imaging in internal flow pattern and macroscopic characteristics of a R134a flash-boiling spray discharged through a vertical twin-orifice atomizer", International Journal of Multiphase Flow, Vol. 75, pp. 224-236, 2015/10/01/ 2015.   DOI
7 V. Praveena and L. J. Martin, "Design Optimization of Urea Injectors and Mixers in a Compact SCR System", SAE Technical Paper0148-7191, 2018.
8 S.-J. Jeong, S.-J. Lee, W.-S. Kim, and C. B. Lee, "Simulation on the optimum shape and location of urea injector for urea-SCR system of heavy-duty diesel engine to prevent NH3 slip", SAE Technical Paper0148-7191, 2005.
9 Weltens, H., Bressler, H., Terres, F., Neumaier, H., and Rammoser, "Optimisation of catalytic converter gas flow distribution by CFD prediction", SAE Technical Paper, 1993.
10 LEFEBVRE, Arthur H. and MCDONELL, Vincent G. Atomization and sprays. CRC press, 2017.
11 CHO, Y. S., et al. "Urea-SCR system optimization with various combinations of mixer types and decomposition pipe lengths", International Journal of Automotive Technology, 2014, 15.5: 723-731.   DOI