Numerical analysis of heat conduction influence on SCR aftertreatment systems EFF

• Autorzy: Bachanek J. , Rogóż R. , Teodorczyk A.

Identyfikatory

DOI

10.5604/01.3001.0012.4313

• Języki publikacji: EN

Abstrakty

EN

Selective Catalytic Reduction (SCR) is well known method for reducing NOx emission in diesel engine exhaust gas. Urea-water solution (UWS) injected into hot stream decomposes due to thermolysis into ammonia and isocyanic acid which hydrolyses further into more ammonia and carbon dioxide. Resultant ammonia is the NOx reductor, producing water vapour and carbon dioxide from the reduction reaction. To provide sufficient NOx reduction efficiency, UWS needs to be properly atomized and mixed with exhaust gas. However, due to more and more restrictive emissions regulations provided by European Union and Close Coupled trend of aftertreatment systems in vehicles the design process is very complex and demanding. Computational Fluid Dynamics (CFD) simulations are integral part of product development, allowing save time and reduce costs of preparing prototypes for further tests. However, it is necessary to understand all the processes and problems connected with NOx reduction in SCR system. Strong turbulent flow of hot stream gas, urea-water solution spray injection, droplets interaction with wall, wallfilm generation are included. The objective of this work is to investigate the impact of heat transfer modelling inside mixing elements of SCR system on urea mixing uniformity and wallfilm deposit on the walls of the system. Simplified and more complex approach is compared with no heat transfer cases. All the simulations were conducted using AVL FIRETM software. Results showed that wall heat transfer might have an impact on mixing efficiency and wallfilm formulation. It is necessary to take into account the effect of mixing elements heat conduction in CFD simulations during the aftertreatment design process.

Słowa kluczowe

EN

SCR; simulation; heat conduction; aftertreatment

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2018
• Tom: Vol. 25, No. 3
• Strony: 51--58
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Bachanek J.

• Warsaw University of Technology Faculty of Power and Aeronautical Engineering Institute of Heat Engineering Nowowiejska Street 21/25, 00-665 Warsaw, Poland tel.: [phone]

autor

Rogóż R.

• Warsaw University of Technology Faculty of Power and Aeronautical Engineering Institute of Heat Engineering Nowowiejska Street 21/25, 00-665 Warsaw, Poland tel.: [phone]

autor

Teodorczyk A.

• Warsaw University of Technology Faculty of Power and Aeronautical Engineering Institute of Heat Engineering Nowowiejska Street 21/25, 00-665 Warsaw, Poland tel.: [phone]

Bibliografia

• [1] Birkhold, F., Selektive katalytische Reduktion von Stickoxiden in Kraftfahrzeugen: Unter-suchung der Einspritzung von Harnstoffwasserloesung, Karlsruher Institut für Technologie, 2007.
• [2] Guan, B., Zhan, R., Lin, H., Huang, Z., Review of state of the art technologies of selective catalytic reduction of NOx from diesel engine exhaust, Appl. Therm. Eng., Vol. 66, No. 1-2, pp. 395-414, 2014.
• [3] Kim, J. Y., Ryu, S. H., Ha, J. S., Numerical prediction on the characteristics of spray-induced mixing and thermal decomposition of urea solution in SCR system, in: ASME 2004 Internal Combustion Engine Division Fall Technical Conference, No. 37467, pp. 165-170, 2004.
• [4] European Commision Regulation (EU) No 459/2012, 2012.
• [5] AVL FIRE 2014.2 Coupling Module CAE User Guide, 2014.
• [6] AVL FIRE 2014.2 Thin Walls Module User Guide, 2014.
• [7] AVL FIRE 2014.2 Spray Module User Guide, 2014.
• [8] AVL FIRE 2014.2 Porosity Module User Guide, 2014.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).