Why is the concentration of Urea Solution for vehicles set at 32.5%?
Automotive Urea Solution/AdBlue®/DEF Fluid/AUS 32
(®= registered trademark of the Verband der Automobilindustrie e.V. (VDA).)
According to actual experimental tests, the freezing point of Automotive Urea Solution(AdBlue®/DEF Fluid) is the lowest when the urea content is 32.5%, which can reach -11 ℃, making it more widely applicable to different climates and regions.
how does Urea Solution for vehicles(AdBlue®/DEF Fluid) work?
The Urea Solution For Vehicle (AdBlue®/DEF Fluid) is added to the truck through a Dispenser for Urea Solution For Vehicles(AdBlue®/DEF Fluid) or a small bucket guide pipe. If it is a National VI vehicle, when the Urea Solution For Vehicle (AdBlue®/DEF Fluid) is added to the vehicle, a Urea Solution For Vehicle (AdBlue®/DEF Fluid) quality sensor will detect the quality of the Urea Solution For Vehicle (AdBlue®/DEF Fluid) . If it does not meet the standard, there will be an alarm prompt. At this time, the Urea Solution For Vehicle (AdBlue®/DEF Fluid) used in the car is in a "sleep" state on the large vehicle.
Pressure Building Stage
After the vehicle is started, the SCR system does not immediately start working. The SCR system meets several conditions: ① the engine is running normally; ② When the temperature inside the urea tank exceeds -4 ℃ and is not met, the urea tank will be heated No post-processing related faults; After the conditions are met, the SCR system can enter the next stage - pressure building stage normally.
The so-called pressure building stage is simply to circulate the Urea Solution For Vehicle (AdBlue®/DEF Fluid) in the SCR system pipeline under pressure. This stage serves two purposes: ① preparing for injection of Urea Solution For Vehicle (AdBlue®/DEF Fluid) circulation; ② Cooling urea nozzle. After successful pressure building and stable pressure, the SCR system enters the next working stage - injection stage.
During the injection phase, the system will calculate the injection amount and timing based on the engine's exhaust temperature, exhaust gas flow rate, nitrogen oxide content, etc., and command the nozzle to inject. The injection of Urea Solution For Vehicle (AdBlue®/DEF Fluid) needs to meet the following conditions: ① The pressure inside the urea pipeline for vehicles must meet the requirements; ② The exhaust temperature reaches 200 degrees Celsius; ③ The urea injection system has no faults; ④ The nitrogen and oxygen content in exhaust gas exceeds a certain value;
After injecting Urea Solution For Vehicle (AdBlue®/DEF Fluid) , urea (CO (NH2) 2) will decompose and convert into ammonia gas (NH3) at high temperatures. Nitrogen oxides in diesel exhaust react with ammonia gas to produce nitrogen gas and water. The chemical reaction is:
2CO (NH2) 2+4NH3+O2=2CO2+4N2+4H2O.
At this stage, the mission of Urea Solution For Vehicle (AdBlue®/DEF Fluid) has been completed.
NewBlue
New blue has over ten years of export experience of AdBlue and Automotive Grade Urea , with high-quality and stable products that comply with ISO22241 standards.
The products mainly include：AdBlue® solution,Automotive Grade Urea,Production Equipment For AdBlue®,Dispenser For AdBlue®,DPF Cleaning Equipment, Car Care Products and so on.
