Home » Agriculture » AdBlue SCR - Selective Catalytic Reduction Fuel Efficient Technology

Here are the answers to some Frequently Asked Questions (FAQ's) about AdBlue :

What is AdBlue ?

AdBlue is a high quality urea solution, and is the registered trademark for AUS32, or Aqueous Urea Solution 32.5% that is used with the Selective Catalytic Reduction system (SCR) to reduce emissions of oxides of nitrogen (NOx) from the exhaust gases of diesel engines. AdBlue is a 32.5% solution of high-purity urea in de-mineralized water that is clear, non-toxic and safe to handle. It is non explosive, non flammable nor harmful to the environment. AdBlue is classified under the minimum risk category of transportable fluids. It is not a fuel, nor a fuel additive and needs to be used in a dedicated tank in your tractor or combine. It is replenished in a similar way to refuelling diesel. Should you spill AdBlue on your hands, simply wash it off with water.

Download the material safety data sheet for AdBlue by clicking here

How much AdBlue do I need ?

Average consumption of AdBlue is generally 5% or less of diesel use, depending upon the workload of the engine, so you will need to fill up much less for AdBlue then you do for diesel. You will use as a maximum about 5 litres of AdBlue to every 100 litres of diesel, and achieve efficiency savings in fuel economy that more than offset the additional purchase cost of the AdBlue.

How should I store AdBlue ?

AdBlue can be stored for 1 year if this is done in a correct manner i.e. away from direct sunlight. It needs to be protected from too warm or too cold temperatures. Its freezing point is at -11 degrees Celsius. When it thaws thoroughly, the product will retain its initial quality. It should be stored in a sealed package and in a well ventilated storage area.

Why should I choose SCR with AdBlue over other technologies ?

AdBlue combined with SCR offers you a fuel efficient solution, with lower CO2 emissions then competitive solutions. All major European and North American lorry manufacturers currently offer SCR equipped models. The future Euro VI emission standard is set to reinforce the demand for this technology in the United Kingdom.

Why does AdBlue quality matter ?

Various actions can affect the quality of AdBlue. To prevent contamination, it is imperative that foreign matters do not come into contact with the solution. Using contaminated AdBlue can lead to expensive catalyst replacement costs. The AdBlue trademark is currently held by the German Association of the Automobile Industry (VDA), who ensure quality standards are maintained in accordance with ISO 22241 specifications. Ensure that you only buy a reagent for your tractor or combine that bears the name AdBlue with the registered trademark (®) on the product label. Buying AdBlue from Air1 UK is a guarantee of the correct specification required for use with your SCR technology.

What is SCR technology for tractors & combines ?

SCR stands for an after treatment technology called Selective Catalytic Reduction. This technology requires the use of a reagent called AUS 32 (also known as AdBlue) to reduce the NOx. Almost all major heavy-duty vehicles manufacturers have decided to use this technology to meet the new emission legislation on NOx emissions. Competitive technologies offer a less beneficial fuel efficiency and higher CO2 emissions. So SCR is the most cost effective solution to meet NOx emission standards.

The main components of the SCR system are the SCR catalyst, the AdBlue injection unit, the AdBlue tank and the AdBlue dosing control unit. AdBlue is injected into the exhaust pipe, in front of the SCR catalyst, downstream of the engine. Heated in the exhaust it decomposes into ammonia and CO2. When the NOx reacts inside the catalyst with the ammonia, the harmful NOx molecules in the exhaust are converted to harmless nitrogen and water.

Download the Air1 AdBlue brochure

How Does SCR work on AGCO SISU engines ?

By measuring engine exhaust gas emissions of NOx, the engine ECU precisely controls the correct amount of AdBlue to be injected into the exhaust just prior to the SCR catalyst, but importantly after the engine has completed combustion, resulting in compliance with the emission regulations without compromise on fuel economy.

Download the AGCO Sisu SCR brochure

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