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Multiple Disc Catalytic Converters - An Innovative Approach for Improved Conversion at Lower Cost
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Abstract
The “Multiple Disc Converter” is an innovative concept. In comparison to conventional catalytic converters, it is significantly less expensive and more compact, at identical conversion efficiency and durability. The catalytic substrate consists of 4 to 5 cylindrical ceramic discs with 62 cells/cm2 (400 cells/inch2). These are assembled in a sheet metal casing, without gaps between the discs, and angularly offset to each other. The flow through the channels is interrupted at the contact surfaces of the individual discs. Hence, the restarted turbulent flow intensifies the transverse mass transfer. Further, the uniformity of the exhaust gas flow is improved, particularly in the first discs. Thus, the conversion of emissions is improved and the durability extended. When the conversion is maintained at the level of conventional converters, then the converter volume can be substantially reduced using the same specific catalyst loading. This is attained by a 10 to 15 % shortening of the total length. The economizing of precious metals, manufacturing savings from the more compact casing and the simplified canning system, all result in up to 10 % lower costs. The basic applicability for large scale production has been proved.
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Citation
Bressler, H., Weltens, H., and Terres, F., "Multiple Disc Catalytic Converters - An Innovative Approach for Improved Conversion at Lower Cost," SAE Technical Paper 940936, 1994, https://doi.org/10.4271/940936.Also In
References
- Weltens H. Bressler H. Doll M. “Design of Exhaust gas Catalyst Systems for European Applications” SAE 880318
- Socha, L.S. Jr. Thompson D.F. “Reduced Energy and Power Consumption for Electrically Heated Extruded Metal Converters” SAE 930383
- Kaiser F.W Maus W. Swars H. Bruck R. “Optimization of an Electrically-Heated Catalytic Converter System Calculations and Application” SAE 930384
- Pierburg GmbH Neuss “Catalyst Light-off System” MTZ Motortechnische Zeitschrift 54 1993
- 29th June 1993 6 93
- Louma M. Lappi P. Lylykangas R. “Evaluation of High Cell Density Z-Flow Catalyst” SAE 930940
- Weltens H. Bressler H. Terres F. Neumaier H. Rammoser D. “Optimization of Catalytic Converter Gas Flow Distribution by CFD Prediction” SAE 930780
- AC-Rochester “Metal Support with herring pattern matrix”
- Kaiser F. W Pelters S. R & D Center, Porsche AG “Comparison of Metal-Supported Catalyst with Different Cell Geometries” SAE 910837
- Nonnenmann M. “New High-Performance Gas Flow Equalizing Metal Supports for Exhaust Gas Catalysts” ATZ Automobiltechnische Zeitschrift 91 1989
- Kuo J.C. Morgan C.R. Lassen H.G. “Mathematical Modeling of CO and HC Catalytic Converter Systems” SAE 710589
- Harned J.L “Analytical Evaluation of a Catalytic Converter System” SAE 720502
- Rottmayer A. “Optimierung des Stoffaustausches im laminar durchstromten Konverter zur Steigerung der katalystischen Aktivitat” Berufsakademie Mannheim 9 93
- Chang, Johnson “The Thermodynamics and Gas Dynamics of Internal Combustion Engines” II Oxford Science Publications