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Wiremesh Substrates for Oxidation, TWC and SCR Converters
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Wiremesh Substrates for Oxidation, TWC and SCR Converters
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From ACS Industries Inc.
The primary requirements of exhaust after treatment systems are low back pressure, low system weight, better emission performance and lower cost. Combinations of these properties provide better engine performance and higher system value. Knitted wiremesh substrates with different geometry and channels are used as carriers of diesel oxidation catalyst, three way catalyst and selective catalytic reduction (SCR) NOx catalyst. Wiremesh materials are chosen not only to withstand corrosion and erosion environments but also durable at maximum continuous operating temperature and peak thermal spikes. Wiremesh substrates provide radial and longitudinal flows (depth flow) and turbulent kinetic energy. The back pressure of the substrate is optimized using different material properties and knitting patterns. Substrate geometry is optimized using different brazing materials and heat treatment conditions. The dimensional tolerances and the process capability of the substrate contours are established. The longitudinal and radial depth flows within the body of the substrate is modeled using computational fluid dynamic analysis. The uniformity index, velocity index, back pressure and turbulent kinetic energy are characterized by fluid dynamic modeling. The catalyzability, packagability and physical durability of the substrates are tested using different wire types and wire mesh patterns. Wiremesh substrates with turbulent and torturous flows could be used as a static mixer for the SCR Urea NOx reduction system for increased performance and avoid urea crystallization.
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