Abstract
Formation of solid urea by-products in mixing sections of SCR systems is a well-known problem in development and design of exhaust gas after treatment systems. Spray impingement induces liquid film formation on mixer blades and tailpipe walls, from which urea by-products can be derived in dependence on temperature and residence time. This work presents a comprehensive modeling approach for prediction of by-product formation. An existing kinetic model for urea decomposition is integrated into CFD simulations by user coding. Implementation is evaluated by 3D simulations of thermogravimetric decomposition of urea and its by-products. Results are compared to experimental data and simulation results from a 0D model. Furthermore, the procedure is applied to simulations of a flow setup including urea injection for demonstration of the model capabilities.
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