EMITEC SCRI SYSTEM READY FOR EURO 6
Emitec has developed an integrated particulate matter (PM) and selective catalytic reduction (SCR) system, SCRi, for light- and heavy-duty diesel applications. The SCRi combines Emitec’s partial flow filter, PM-METALIT and a new highly effective turbulent SCR catalyst into one cost-effective and maintenance-free system, that It is the first continuously operating system that reduces both particulate matter and nitrogen oxides (NOx) simultaneously, to Euro 6 levels.
The SCRi system works in three steps. First, the exhaust gas passes through an oxidation catalyst to eliminate harmful hydrocarbon and carbon monoxide emissions and at the same time oxidize nitrogen oxide to nitrogen dioxide. By using Emitec’s patented turbulent LS foils, the volume of this oxidation catalyst could be reduced by approximately one-quarter.
Secondly, urea (AdBlue) is injected into the exhaust stream and routed into a second module, consisting of a PM-METALIT followed by a turbulent SCR catalyst. In the coated PM-METALIT, the injected AdBlue is converted to ammonia, a reducing agent, while at the same time fine particles are continuously filtered and oxidized. In contrast to other particle filtration devices, Emitec’s PM-METALIT does not need periodic active regeneration and ash removal maintenance.
Finally, the filtered exhaust gas and the reducing agent simultaneously pass over a highly efficient and compact SCR catalyst, where nitrogen oxide is reduced to harmless nitrogen and water. This SCR catalyst uses a combination of Emitec’s turbulent longitudinal (LS) and perforated (PE) foils, making it possible to reduce the catalyst volume by approximately one-third and fit it together with the PM-METALIT inside a compact housing. Due to this compact construction it would fit neatly into the space available in buses.