JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Numerical Design of Auto-Catalyst Substrate for Improved Conversion Performance Using Radially Variable Cell Density
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Numerical Design of Auto-Catalyst Substrate for Improved Conversion Performance Using Radially Variable Cell Density
Jeong, Su-Jin; Kim, U-Seung;
  PDF(new window)
 Abstract
The optimal design of auto-catalyst needs a good compromise between the pressure drop and flow uniformity in the substrate. One of the effective methods to achieve this goal is to use the concept of radially variable cell density. But this method has not been examined its usefulness in terms of chemical behavior and conversion performance. In this work, two-dimensional performance prediction of catalyst coupled with turbulent reacting flow simulation has been used to evaluated the benefits of this method n the flow uniformity and conversion efficiency. The results showed that two cell combination of 93cpsc and 62 cpsc was the most effective for improved pressure drop and conversion efficiency due to balanced space velocity and efficient usage of geometric surface area of channels. It was also found that large temperature difference between the bricks in case that the edge of the frontal face of brick has too much lower cell density(less than 67% of cell density of the center of the brick). This study has also demonstrated that the present computational results show the better prediction accuracy in terms of CO, HC and NO conversion efficiencies compared to those of conventional 1-D adiabatic model by comparison with experimental results.
 Keywords
Catalytic Converter;kinetics;Oxidation;Reduction;Substrate;Conversion Performance;
 Language
Korean
 Cited by
 References
1.
Siemund, S., Leclerc, J. P., Schweich, D., Prigent, M. and Castagna, F., 1996, 'Three-Way Monolithic Converter : Simulations Versus Experiments,' Chemical Engineering Science, Vol. 51, No. 15, pp.3709-3720 crossref(new window)

2.
Zygourakis, K., 1989, 'Transient Operation of Monolith Catalytic Converters : A Two-dimensional Reactor Model and The Effects of Radially Non-uniform Flow Distributions,' Chemical Engineering Science, Vo. 44, pp. 2075-2086 crossref(new window)

3.
Chen, D. K. S., Oh, S. H., Bissett, E. J. and Ostrom, D. L., 1988, 'A Three-dimensional Model for the analysis of Transient Thermal and Conversion Characteristics of Mololithic Catalytic Converters,' SAE Paper No.880282

4.
Kim, J-Y, 1993, 'Flow Distribution and Pressure Drop in Diffuser-Monolith Flow: Implications to the Automotive Catalytic Converter Design,' Ph.D Thesis, Wayne State University, Detroit, Michigan

5.
Jeong, S-J and Kim, T-H, 1997, 'CFD Investigation of the 3-dimensional Unsteady flow in the Catalytic Converter,' SAE Paper 971025

6.
Bella, G., Rocco, V. and Maggiore, M., 1991, 'A Study of Inlet Flow Distortion Effects on Automotive Catalytic Converters,' J. of engineering for Gas Turbines and Power, Vol. 113, pp. 419-426

7.
Jeong, S-J and Kim, W. S., 1998, 'A Numerical Approach to Investigate Transient Thermal and Conversion Characteristics of automotive Catalytic Converter,' SAE Paper 980881

8.
정수진, 김우승, 1999,'자동차용 촉매변환기의 최적설계를 위한 열 및 유동특성에 대한 수치적 연구,' 대한기계학회논문집, B권, 제23권 제 17호, pp.841-855

9.
Jeong Y. Kim and Seha Son, 1999, 'Improved flow Efficiency of a Catalytic Converter Using the Concept of Radially Variable Cell Density - Part I,' SAE Paper 1999-01-0769

10.
Paul Day J. and Louis S. Socha, Jr., 1991, 'The Design of Automotive Catalyst Supports for Improved Pressure Drop and Conversion Efficiency,' SAE Paper No.910371

11.
Khalfi, A., Marcuccilli, F., Brillard, A. and Gilot, P., 1996, 'Behaviour of Three-Way Catalysts : Comparison between High-cell Density Catalytic Converters and Conventional Ones,' Bull. Soc. Chim. Belg. Vol. 105, No. 9, pp. 519-526

12.
Subramanian, B. and Varma, A., 1985, 'Reaction Kinetics on a Commercial Three-Way Catalyst : the $CO-NO-O_2-H_2O$ System Ind. Engng. Chem. Prod. Res. Dev., Vol. 24, pp. 512-516 crossref(new window)

13.
Kirchner, T. and Eigenberger, G., 1997, 'On the Dynamic Behaviour of Automotive Catalysts,' Catalysts Today, Vol. 38, pp. 3-12 crossref(new window)

14.
Rich, B.R., 1953, 'An Investigation of Heat Transfer from an Inclined Flat Plate in Free Convection,' Trans. ASME, Vol. 75, pp. 489-499

15.
Dubien, C., Schweich, D., Mabilon, G., Martin, B. and Prigent, M., 1997, 'Three-Way Catalytic Converter Modeling : Fast and slow Oxidizing Hydrocarbons, Inhibiting Species and Steam Reforming Reaction,' Chemical Engineering Science, Vol. 53, No. 3, pp. 471-481

16.
Star-CD Ver. 3.0 Mannual, 1997, Computational Fluid Dynamics Ltd

17.
Baratti, R., Wu, Hua, Massimo Morbidelli and Arvind Varma, 1993, 'Optimal Catalyst Activity Profiles in Pellets - X. The role of Catalyst Loading,' Chem. Eng. Sci., Vol. 48, No. 10, pp. 1869-1881 crossref(new window)

18.
馬場直樹, 大澤克幸, 1996, '觸媒暖機科程における昇溫及び淨化擧動の解析,' 自動車技術會論文集, Vol. 27, No. 3, pp. 59-65

19.
Tronci, S., Baratti, R., and Gavriiilidis, A., 1999, 'Catalytic Converter Design for Minimisation of Cold-Start Emissions,' Ehem. Eng. Comm., Vol. 173, pp.53-77 crossref(new window)

20.
Yakhot, V. and Orszag, S. A., 1986, 'Renormalization Group Analysis of Turbulence, I. Basic Theory,' J. of Sci. Comput., Vol.1, pp.1-51 crossref(new window)

21.
Voltz, S. E., Morgan, C. R., Lieberman, D. and Jacob, S. M., 1973, 'Kinetic Study of Carbon Monoxide and Propylene Oxidation on Platinum Catalysts,' Ind. Eng. Chem. Prod. Res. Dev., Vol. 12, No. 4, pp. 294-301 crossref(new window)