Development and validation of model for blended 2-way DPF/SCR

Soo-Youl  Park, University of Wisconsin, Madison

The 2-way DPF/SCR emission reduction system has recently been extensively studied due to its potential of cost savings and packing flexibility. Unlike a conventional emission reduction system that consists of a DPF and an SCR for both PM and NOx reduction, this 2-way system incorporates SCR function into a wall-flow DPF as a single device by coating SCR catalysts into the filter wall of the DPF. Such a combinatorial system has an advantage of lower system volume and cost, since exhaust gas undergoes soot filtering and NOx reduction reaction simultaneously as it passes through the channels and filter wall. In this work, the mathematical formulations which govern the physical and chemical phenomena in the 2-way DPF/SCR are derived; and a computer simulation model is developed based on these formulations. The model has been validated and tested with experimental data from a reactor flow bench in a systematic manner, which captures ammonia adsorption and desorption, NOx reduction, and soot loading /regeneration behavior of the blended 2-way DPF/SCR device.

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