EXPERIMENTAL AND 3D, EMBEDDED MODELING FOR DIESEL ENGINE SCR DEPOSIT

다국어 초록 (Multilingual Abstract)

Nowadays, the selective catalytic reduction (SCR) is a promising solution to fulfill stringent nitrogen oxide (NOX) emission standards enforced by worldwide regulation bodies for lean burning engines. However, in the practical operation, urea deposits occur under unfavorable conditions, which bring about a failure of urea dosing strategy, affect the SCR system de-NOx performance and lowering the fuel economy by increasing the engine back pressure. This paper will present 3D deposit model, which can be used to predict the deposit position. Furthermore, a model-based controls strategy and calibration are designed. The comparison test results of both engine emission tests and vehicle field tests shows there is significant deposits improvement with the embedded model.

참고문헌 (Reference)

1 Fang, H. L., "Urea thermolysis and NO x reduction with and without SCR catalysts" 46 (46): 17-34, 2003

2 Tang, T., "Urea decomposition at low temperature in SCR systems for diesel engines"

3 Y. S. CHO, "UREA-SCR SYSTEM OPTIMIZATION WITH VARIOUS COMBINATIONS OF MIXER TYPES AND DECOMPOSITION PIPE LENGTHS" 한국자동차공학회 15 (15): 723-731, 2014

4 Schaber, P. M., "Thermal decomposition (pyrolysis) of urea in an open reaction vessel" 424 (424): 131-142, 2004

5 Hauck, P., "Surface chemistry and kinetics of the hydrolysis of isocyanic acid on anatase" 70 (70): 91-99, 2007

6 Kuhnke, D., "Spray/Wall Interaction Modelling by Dimensionless Data Analysis" Darmstadt University of Technology 2004

7 Fischer, S., "Simulation of the Urea-water-solution Preparation and Ammonia-homogenization with a Validated CFD-model for the Optimization of Automotive SCR-systems" Vienna University of Technology 2012

8 M. N. KABIR, "SIMULATION OF OXIDATION CATALYST CONVERTER FOR AFTER-TREATMENT IN DIESEL ENGINES" 한국자동차공학회 16 (16): 193-199, 2015

9 Way, P., "SCR performance optimization through advancements in aftertreatment packaging"

10 Johnson, T. V., "Review of diesel emissions and control" 10 (10): 275-285, 2009

11 Smith, H., "Optical and numerical investigations on the mechanisms of deposit formation in SCR systems" 7 (7): 525-542, 2014

12 Kim, J. Y., "Numerical prediction on the characteristics of spray-induced mixing and thermal decomposition of urea solution in SCR system" 165-170, 2004

13 Yih, S. M., "Modeling heat and mass transport in falling liquid films" 2 : 111-210, 1986

14 Birkhold, F., "Modeling and simulation of the injection of urea-water-solution for automotive SCR DeNO x-systems" 70 (70): 119-127, 2007

15 L. LÜ, "MODEL-BASED OPTIMIZATION OF PARAMETERS FOR A DIESEL ENGINE SCR SYSTEM" 한국자동차공학회 14 (14): 13-18, 2013

16 Schadel, S. A., "Interpretation of atomization rates of the liquid film in gas-liquid annular flow" 15 (15): 893-900, 1989

17 Bernhard, A. M., "Hydrolysis and thermolysis of urea and its decomposition byproducts biuret, cyanuric acid and melamine over anatase TiO2" 115-116 : 129-137, 2012

18 Kontin, S., "Heat and mass transfer accompanied by crystallisation of single particles containing urea-water-solution" 2010

19 Strots, V. O., "Deposit formation in urea-SCR systems" 2 (2): 283-289, 2010

20 Yim, S. D., "Decomposition of urea into NH3 for the SCR process" 43 (43): 4856-4863, 2004

21 Birkhold, F., "Analysis of the injection of urea-water-solution for automotive SCR DeNOxsystems:Modeling of two-phase flow and spray/wallinteraction"

22 Schiller, L., "A drag coefficient correlation" 77 (77): 51-, 1935