To initiate a catalytic reaction and support NOx reduction, AdBlue / DEF is injected into the exhaust stream via a mixer. The primary function is to fully blend the AdBlue / DEF with the exhaust flow without generating deposits. AdBlue / DEF is an aqueous urea solution and is decomposed into ammonia gas that is equally distributed with the exhaust gas prior to reaching the SCR catalyst face.
AdBlue / DEF mixers are typically a combination of an injector plus a mixer – the goal is to create the smallest overall package size with the most effective mixing, without generating deposits and excessive backpressure. Donaldson has an extensive portfolio of mixer solutions to meet specific OE requirements.