What are the effects of excessive urea concentration in vehicle exhaust treatment?

[StCecilia]

Excessive urea concentration in vehicle exhaust treatment can affect the reduction of automotive emissions, leading to ammonia slip and the formation of secondary pollutants. Below is relevant information about urea: 1. Concept: The SCR solution has significant advantages in the National IV diesel vehicle emission treatment system, and vehicle urea is an essential additive for the SCR solution. 2. Operation process: The operation process of the SCR system is as follows: when nitrogen oxides are detected in the exhaust pipe, the urea tank automatically sprays diesel exhaust fluid. The diesel exhaust fluid and nitrogen oxides undergo a redox reaction in the SCR catalytic reaction tank, producing non-polluting nitrogen and water vapor, which are then discharged.