Influence of Heating Measures on Urea Processing 2023-01-5037
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
(NOx) 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.