Technical Paper
Numerical modeling of liquid film boiling, urea deposition and solidification in SCR applications
2024-04-09
2024-01-2626
The proposed Euro 7 regulation would substantially tighten the NOx emission standard down to the level of 0.03 g/km. The upcoming China 6b and US EPA regulations also see a similar trend for NOx emission. This calls for improvements and advancements to the current Urea/Selective Catalytic Reduction (SCR) after-treatment systems. The Urea deposit formation remains as a key challenge to modern Urea/SCR design. It’s proven that Computational Fluid Dynamics (CFD) can be an effective and efficient tool to predict Urea deposit. An accurate wall temperature prediction is crucial in Urea deposit modeling. Fully understanding the kinetics of Urea decomposition and the thermodynamic properties of the deposit by-products are also critical to predict the right amount of deposit in the right location. In this study, a novel film boilng model (BRT) is implemented and tested on a validation case from a previously published paper.