What Are the Solutions for Urea Crystallization in the Exhaust Pipe?

[MacNadia]

Change the layout and direction of the exhaust pipe, repair the injection system, clean the crystallization in the exhaust pipe, or alter driving habits to resolve the issue. Below are the reasons for urea crystallization in the exhaust pipe: 1. Unreasonable exhaust pipe layout: After urea is injected, localized vortices or areas with low gas flow velocity can cause urea solution spray to crystallize in the exhaust pipe. If not addressed promptly, this can lead to exhaust pipe blockage. This situation requires modifying the exhaust pipe layout and direction. 2. Faulty urea injection system: Poor spray atomization prevents urea from fully decomposing and evaporating, leaving residue that crystallizes on the exhaust pipe wall. Repairing the injection system can resolve this issue. 3. Cold weather: If the external temperature is very low, the exhaust pipe wall temperature will also be very low, making it difficult for the injected urea to evaporate. This results in crystallization on the inner wall of the exhaust pipe. This is a common occurrence and may not necessarily indicate a fault. Simply cleaning the crystallization in the exhaust pipe or changing driving habits can resolve the issue.