Why use AdBlue
In order to meet emissions standards, diesel powered vehicles and plant equipment are required to reduce their emissions down to a certain level depending upon their engine size. In order to reduce the Nitrous Oxides present in emissions, Selective Catalytic Reduction systems (SCR), which use AdBlue, are now established as a feature of truck, busses / coaches, construction vehicles and agricultural vehicles.
Whats is AdBlue
AdBlue is a chemical liquid used in Selective Catalytic Reduction (SCR) on diesel vehicles in order to reduce NOx levels. The AdBlue fluid (urea and demineralized water) is injected into the exhaust system just before the SCR catalyst. The introduction of AdBlue into the exhaust gasses generates a chemical reaction inside the SCR Cat which results in NOx being converted into Nitrogen and Water Vapor. AdBlue was introduced by vehicle manufacturers in order to hit the stringent emission targets set out by governmental bodies. AdBlue is sometimes referred to as DEF (Diesel Exhaust Fluid).
The AdBlue and SCR system is a relatively complex system with an array of electronic sensors, modules and pumps, these systems can fail and can be expensive to maintain. A vehicle which is used on a regular basis will consume a large amount of AdBlue and the tank will need to be refilled on a regular basis.