This multi-faceted project has had the overarching purpose of integrating a novel AdBlue dosing unit in a SCR system. The novelty of the dosing unit is connected to the device’s ability to pre-heat the reductant prior to dosing it into the system. Owing to the multicomponent nature of the reductant, evaporation and thermal decomposition is not easily predicted. Therefore, substantial component testing has been performed with the aim of describing the characteristics of the dosed reductant.
As a second step, the characteristics defined from the laboratory testing has been used to develop a Computational Fluid Dynamics (CFD) spray model which could be applied for full system analysis for the development of a mixing system fit for the new dosing module type.
In parallel the dosing module has been further developed to achieve greater robustness in transient operation as well as in maximizing the amount of thermal energy the reductant can be ex-posed to, without risking failure caused by solid deposition of the urea byproducts well known in the field of urea-SCR-systems.
Finally, a bespoke mixing system was proposed based on the learnings of the project. On this, as well as on a current state of art system, the advantage in terms of emissions performance improvement (specifically NOx conversion) was demonstrated. The demonstration was done on an engine dynamometer considering transient cycles well known in the industry.