Where is the urea nozzle installed?

[Weston]

The urea nozzle is installed on the exhaust pipe of diesel vehicles and is a key component of the diesel exhaust after-treatment system. The function of the urea nozzle is to quantitatively inject the urea aqueous solution for exhaust after-treatment, which can reduce nitrogen oxide emissions. The urea nozzle is a wearing part and needs to be cleaned and replaced frequently. In the exhaust gas treatment process, the urea injection unit injects the urea aqueous solution at the appropriate time and in the appropriate amount into the exhaust pipe, i.e., upstream of the SCR catalytic converter. The urea is then thermally decomposed and hydrolyzed into ammonia, which reduces harmful nitrogen oxides into nitrogen and water in the SCR catalytic converter.