Introduction of SCR System and AdBlue/DEF

      AdBlue is a product developed with increasing global air pollution and heavy diesel emission regulations. 

Particulate matter (PM) and nitrogen oxides (NOX) of diesel vehicle exhaust are two main sources of vehicle exhaust  pollution, the main exhaust after-treatment technologies used in Europe , America and Japan to reduce nitrogen oxides of diesel  vehicle exhaust are SCR and EGR+DPF. Among them , Europe and Japan used are SCR based, America has also turned to  SCR after 2010. 

As the reducing agent in SCR , AdBlue production has became an emerging industry with a complete system of  production and sales. Besides , lots of countries such as Europe, American and Japan have developed complete mature  technology and application specification for AdBlue.

Comparing SCR with EGR+ DPF and Considering the continuity of technology, domestic diesel quality and so on, the  SCR technology is more in line with the requirements of diesel development in most countries.

China has adopted SCR technology in almost all heavy National IV type-approval diesel engines .The SCR exhaust  system has become the inevitable choice for heavy diesel vehicles of Euro IV, V and VI in most countries, which will also  promote the development of AdBlue .

SCR represents a kind of selective catalytic reduction technology which is suitable for heavy vehicles, trucks, buses and  used for exhaust after-treatment. Through the test of the market, SCR is the most economical way in the nitrogen oxide  emission reduction scheme. 

The main components of the SCR technology are catalyst , spray nozzle , storage AdBlue tank, feed controller, NOx  sensor, etc. With the reaction of the catalyst, the ammonia is produced by heated AdBlue and water. Then the harmful nitrous  oxide(NOx) in the diesel exhaust is converted into harmless nitrogen and water.

    Assembly diagram of SCR system in heavy diesel vehicle as followed.

AdBlue is a high quality nitrogen oxide reducing agent used in selective catalytic reduction systems to  reduce the nitrogen oxides emitted by diesel vehicles. It is a non-explosive, nonflammable and environmentally  harmless solution which consisted of 32.5% high purity urea prilled and pure water. Belonging to the lowest risk of liquid, AdBlue can be classified as non-dangerous goods, the using method is as simple as refueling, just  rinse it with clean water if splashed on your hand.

Scope of application:

Imported diesel car such as Bens Blue TEC GL320 / GL350 / GL550, Audi Q7, Volvo, Ford F150, F350, F450、F650、CDI、Blue Tec, Volkswagen Touareg, etc.

Diesel trucks of EuroⅤand EuroⅥ emissions such as Scania.

Benz Actors commercial trucks such as Actors series, Axor series, Atego series, Unimog series and Zetros series.

Domestic Brands Euro V and Euro VI trucks and bus, such as Cummins , Renault, Renault, Yuchai, Weichai, Fukuda, Xichai, etc.

SCR selective catalytic reduction reaction principle diagram as follows 

SCR reaction equations are as follow

According to the reaction principle, it shows that the main emissions from car exhaust are the common nitrogen and water in the air after using the AdBlue.

In addition, it is beneficial to reduce the emission of solid particulate matter which lead to Fog weather in the north by using the SCR and DPF (Diesel Particulate Filter) technology.

PS. At present, the common use international standards is as followed. 

-ISO22241 ( the highest standard of international industry)

-DIN700070(the highest standard of German industry)

-AUS32( the highest standard of Australia industry)

-JIS K 2247-1( the highest standard of Japan).

In 2013, China formally implement national standard of the vehicle urea solution, which is GB 29518-2013, diesel engine NOx agent urea aqueous solution (AUS 32). Thus, the global market of AdBlue has bright future and huge development potential.