With the promotion of the use of urea, people are more and more aware of the importance of the quality of automotive urea.
If the quality of the vehicle urea is not met, the lighter will reduce the conversion efficiency of NOx, and the heavy person will directly destroy the post-treatment system causing irreversible mechanical failure, or even stop the work of the post-processing system.
How does the quality of the urea used in the vehicle affect the whole vehicle and the SCR system? The concentration of urea solution is one of the key factors.
The urea concentration directly affects the catalytic efficiency of NOx and the solidification point of Urea solution, and also affects the parameter setting of the post-treatment system, and the concentration of high-quality urea solution must be in the specified range.
The influence of urea quality on the spray attachment of SCR system insoluble in water impurities combustion produces carbon, the effect of post-treatment system spray accessories, will clog the catalyst skeleton, resulting in catalyst efficiency and service life is reduced, impurities will cause air pump damage. Influence of urea quality on SCR system catalysts SCR catalyst is the core of SCR reduction technology, and SCR catalysts are the core of SCR catalytic converter. The activity of catalysts is essential for improving the efficiency of the entire SCR system.
The index of aldehydes in automotive urea is specified below 5ppm, and aldehyde substances may affect the coating of the catalyst in the SCR system. The production of sediments is a common problem in the use of urea solution. The formation of sediment has seriously affected the operation of SCR system, even caused the blockage of pipelines, corrosion of the deposition area, blockage of the catalyst Channel, and eventually the SCR system failed.
High-quality urea will greatly reduce the production of sediment.
1, inferior urea impurities produced by the accumulation of carbon
2, the liquid tank pipeline blockage 3, poor quality urea impurities, resulting in impurities into the filter, damaged urea pump