Influence of Heating Measures on Urea Processing

With the introduction of the emission legislation Euro VI for commercial vehicles (CVs), selective catalytic reduction (SCR) with urea water solution (UWS) as the reducing agent has become a standard to minimize the nitrogen oxides (NO_x) emissions from internal combustion engines. The urea processing and mixing unit has been developed and optimized in order to avoid deposit formation and ensure a high level of urea processing over the whole operation range, especially at lower temperatures. However, there are physical limits to the conversion of urea in conventional processing units during very low engine operating conditions. With the EHC Fractal Heater, Purem by Eberspächer has developed a heating measure that, in addition to its main function of accelerating the light-off of catalytic converters, also comes with the possibility of improving the UWS processing, especially under these low-load conditions.