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Investigation of Deposits in Urea-SCR After-Treatment Systems for Heavy-Duty Diesel Engines
Corresponding Author(s) : Guoxiang Li
Asian Journal of Chemistry,
Vol. 25 No. 6 (2013): Vol 25 Issue 6
Abstract
To ensure SCR system normal application, one of the basic requirements is to avoid the deposition of urea droplets including crystallization in the exhaust stream. Design and calibration principles are the main causes of urea deposition. Unreasonable structure design, machining and installation can lead to urea crystallization phenomenon inside the bore of the nozzle, on the exhaust pipe wall and the front end surface of the catalyst because of the insufficient atomization and decomposition of urea droplets. In addition, unreasonable calibration strategy can also deteriorate this condition. The components of the urea deposits were tested and analyzed by thermogravimetry-FTIR technology indicating that the urea deposits are the urea and cyanuric acid. On this basis, the modified structure of integral nozzle mounting is provided to improve the design. The engine dynamometer test and the vehicle road test were conducted showing that the optimal design and calibration strategy can effectively avoid crystallization and sedimentation in the system.
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- T.V. Johnson, Review of Diesel Emissions and Control, SAE paper, 01-0301 (2010).
- T. Jianzhong, Study on DeNOx Technology by Selective Catalytic Reduction (SCR) for Heavy-Duty Diesel Engines, Jinan:Shandong University (2008).
- V.O. Strots, S. Santhanam, B.J. Adelman, G.A. Griffin and E.M. Derybowski, Deposit Formation in Urea-SCR Systems, SAE paper, 2009-01-2780 (2009).
- K. Hirata, N. Masaki and H. Ueno, Development of Urea-SCR System for Heavy-Duty Commercial Vehicles, SAE paper, 01-1860 (2005).
- Y. Zhu, S. Zhou, M. Liu and J. Wang, Asian J. Chem., 24, 5519 (2012)
- J.-H. Gao, J. Kuang, C.-L. Song, Z.-R. Zhang and X.-J. Jing, J. Combust. Sci. Technol., 16, 547 (2010).
- L. Xu, W. Watkins, R. Snow, G. Graham, R. McCabe, C. Lambert and R.O. Carter, Laboratory and Engine Study of Urea-Related Deposits in Diesel Urea-SCR After-Treatment Systems, SAE Paper 01-1582 (2007).
- G. Zheng, A. Fila, A. Kotrba and R. Floyd, Investigation of Urea Deposits in Urea SCR Systems for Medium and Heavy Duty Trucks, SAE paper, 01-1941 (2010).
- G. Salanta, G. Zheng, A. Kotrba, L. Bergantim and R. Rampazzo, Optimization of a Urea SCR System for On-highway Truck Applications, SAE paper, 01-0094 (2010).
- P.M. Schaber, J. Colson, S. Higgins, D. Thielen, B. Anspach and J. Brauer, Thermochim. Acta, 424, 131 (2004).
References
T.V. Johnson, Review of Diesel Emissions and Control, SAE paper, 01-0301 (2010).
T. Jianzhong, Study on DeNOx Technology by Selective Catalytic Reduction (SCR) for Heavy-Duty Diesel Engines, Jinan:Shandong University (2008).
V.O. Strots, S. Santhanam, B.J. Adelman, G.A. Griffin and E.M. Derybowski, Deposit Formation in Urea-SCR Systems, SAE paper, 2009-01-2780 (2009).
K. Hirata, N. Masaki and H. Ueno, Development of Urea-SCR System for Heavy-Duty Commercial Vehicles, SAE paper, 01-1860 (2005).
Y. Zhu, S. Zhou, M. Liu and J. Wang, Asian J. Chem., 24, 5519 (2012)
J.-H. Gao, J. Kuang, C.-L. Song, Z.-R. Zhang and X.-J. Jing, J. Combust. Sci. Technol., 16, 547 (2010).
L. Xu, W. Watkins, R. Snow, G. Graham, R. McCabe, C. Lambert and R.O. Carter, Laboratory and Engine Study of Urea-Related Deposits in Diesel Urea-SCR After-Treatment Systems, SAE Paper 01-1582 (2007).
G. Zheng, A. Fila, A. Kotrba and R. Floyd, Investigation of Urea Deposits in Urea SCR Systems for Medium and Heavy Duty Trucks, SAE paper, 01-1941 (2010).
G. Salanta, G. Zheng, A. Kotrba, L. Bergantim and R. Rampazzo, Optimization of a Urea SCR System for On-highway Truck Applications, SAE paper, 01-0094 (2010).
P.M. Schaber, J. Colson, S. Higgins, D. Thielen, B. Anspach and J. Brauer, Thermochim. Acta, 424, 131 (2004).