SCR Urea Injector

1.Prodctor Introduction

SCR Urea Injector is a key component in the Selective Catalytic Reduction (SCR) system, which is used to reduce nitrogen oxides (NOx) emissions in diesel engines. The injector is responsible for injecting a precise amount of urea into the exhaust stream, where it reacts with NOx to form harmless nitrogen gas and water vapor. This process is essential for meeting stringent emissions regulations in modern diesel engines. The SCR Urea Injector typically consists of a nozzle, a urea injector valve, and a heating element to prevent urea crystallization.

2.Working Principle

1. Urea solution is injected: Urea solution (usually called AdBlue) is injected into the exhaust gas stream through the SCR urea injector. The urea solution contains a reducing agent, which reacts with the NOx in the exhaust gas to form nitrogen and water vapor.
2. Decomposition of urea solution: The urea solution is decomposed into ammonia (NH3) and carbon dioxide (CO2) in the exhaust gas stream. This reaction is catalyzed by a special SCR catalyst.
3. NOx reduction: When the ammonia and NOx come into contact with the SCR catalyst, a reduction reaction occurs. The NOx is reduced to nitrogen and water vapor, which are harmless gases that are emitted into the atmosphere.
4. Precise control: The SCR urea injector is designed to provide precise control of the urea solution injection rate. This allows the system to adjust the amount of NOx reduction based on the engine operating conditions and the required emission levels.