The purpose of the prebox is to gain as much utilization of the exhaust heat as possible. This will enable an early start of injection of the AdBlue^® for the NO_X reduction, and therefore it must be fitted very close to the engine. It has been a challenge that calls for clever system design down to each component. Space is tight near the engine, so the prebox needs to be compact and still contain the necessary components; electric heater, urea dosing & mixing, flexible element, and in some cases also the first in a series of SCR-substrates (depending on application).

To avoid the risk of Urea deposit formation, the mixer needs to be extremely compact and still highly efficient. In addition, the insulation needs to be effective and compact to protect nearby components from thermal impact of the e-heater and exhaust gas.

All in all, integrating a prebox in an already complex system is a complex engineering challenge. Despite this, Dinex has proven it to be doable by using own technologies and innovative solutions, which are scalable to individual customers requirements.

At first the Mainbox may seem similar to a Euro 7 aftertreatment system as the wellknown the key catalyst functions are present; Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) and SCR catalyst including injection and mixing of Urea. But from there, the resemblance stops. If not included in the Prebox, the Mainbox also contain the first of two SCR catalysts in front of the DOC.

The tighter performance requirements make it necessary to set new standards for temperature retention, mixing efficiency and NO_X conversion rate. All without compromising acoustic performance and simultaneously respecting increased durability requirements, and still designed in the same limited space available.

This does not leave much room to design an optimized solution, but with Dinex’ patented compact mixing technologies and versatile layout concepts, chances are that the right application specific solution is just around the corner.