AdBlue: an additive to pollute less
Keywords: pollution reduction, NOx, nitrogen dioxide, anti-nox, DeNOx.
In the same way as for passenger cars, trucks must comply with anti-pollution standards more stringent. The AdBlue technology allows diesel trucks to reduce emissions of nitrogen oxides.
At the time of the decision or -political entrepreneurs- take greater account of environmental protection, it should be noted the demands made by the emission standards Euro 4 on heavy goods vehicles. From 1er 2006 October, the older generation engines will reduce 30% emissions (NOx, CO, HC). This implies a generalization of particulate filters on all vehicles.
To achieve this, two techniques are opposed. EGR (Exhaust Gas Recirculation) is used by manufacturers MAN and Scania. A part of the exhaust gas is cooled and returned to the engine to achieve a lower combustion temperature and complete consumption of unburnt hydrocarbons (a lower combustion temperature reduces the nitrogen oxide emissions and pressures of higher injection produce less particles).
According to the manufacturer GreenChem AdBlue allow a law to reduce consumption 5%
This technology allows to use standard diesel fuel available at any pump, without having to worry about the availability of additives.
SCR (Selective Catalytic Reduction) concerning areas of distribution of AdBlue infrastructure was developed. In fact, the SCR is a post-processing method that requires the addition of this additive urea. AdBlue is injected into the exhaust to maintain a reaction in the catalytic converter, which is integrated in the silencer. This method of post-treatment is used to reduce nitrogen oxides (NOx).
It may thus be necessary to refill the AdBlue when the vehicle is refueled. Adding an extra tank for AdBlue is necessary.
The composition is made of AdBlue 32,5% urea (CO2 and ammonia) and chemically pure water, which allows to reprocess the exhaust gas by converting approximately 85% steam in nitrogen oxides to water and in nitrogen to harmless nature.
With a consumption of AdBlue which is around 1,5l / 100 km for vehicles that meet the Euro 4 standard SCR technology allows a reduction of about 5% of the average diesel consumption, covering the extra cost due to its use.
Created in 2003, the Dutch company GreenChem (who owns AdBlue) plans to expand its distribution network and in particular the affiliated gas stations. This is where the rub.
Indeed, the French first automated station will finally emerge in Calais (North). But it will take several years for the entire hexagon is covered ... and all the structures do not necessarily have the means to store containers on their website. Too bad, when we know that AdBlue is particularly well established among our neighbors.
Be that as it may, the essential thing is to be able to envisage a less "gray" future in transport. And this is the essential!
Author and Source: Julien Marcos