SCR Exhaust After-treatment System for D13C Engines

This article provides information about the operation of the SCR exhaust after-treatment system in D13C engines. Nowadays, atmospheric pollution is one of the main problems of our society, even though most of this pollution occurs in cities with heavy congestion, in which most vehicles emit polluting gases such as CO2 and NOx, the latter is formed by nitric oxide (NO) and nitrogen dioxide (NO2). Therefore, this type of gas is very harmful to the person, which is why technology was developed to mitigate this pollution problem. The SCR technology, also called Selective Catalytic Reduction, uses the AdBlue solution, which is an additive combined with an infusion of urea to treat nitrogen oxide to comply with the exhaust emission standards applied to Euro 5 trucks. The AdBlue solution is injected into the exhaust gases before they pass through the catalytic converter. Thus, the additive converts NOx into nitrogen gas and steam. To meet Euro 5 requirements, about 5-6% dilution of the reagent is required in correlation to the volume of fuel available.