company news about Automobile SCR system: the "magician" for purifying exhaust gas

Automobile SCR system: the "magician" for purifying exhaust gas

With increasingly stringent environmental regulations, automobile exhaust emission control has become a top priority. Among the many exhaust after-treatment technologies, the SCR (selective catalytic reduction) system has become the "magician" for purifying exhaust gas from diesel vehicles due to its high efficiency and stability. So, how does the SCR system work?

1. Composition of the SCR system

The SCR system is mainly composed of the following parts:

Urea injection system:Including urea tank, urea pump, urea nozzle, etc., responsible for accurately injecting urea solution into the exhaust pipe.

Catalytic converter: It is equipped with SCR catalyst inside and is the core component for chemical reaction.

Sensor:Including NOx sensor, temperature sensor, etc., used to monitor exhaust gas composition and temperature, and provide data for the control system.

Control system:According to the sensor signal, the urea injection amount is controlled to ensure the best catalytic reduction effect.

II. Working principle of SCR system

The working principle of SCR system can be simply summarized as "urea decomposition, catalytic reduction":

1. Urea injection: The control system calculates the required amount of urea solution according to the engine operating conditions and NOx concentration in the exhaust gas, and sprays it into the exhaust pipe through the urea nozzle.

2. Urea decomposition: High-temperature exhaust gas decomposes urea solution to generate ammonia (NH3).

3. Catalytic reduction:Ammonia and NOx in the exhaust gas react chemically on the surface of SCR catalyst to generate harmless nitrogen (N2) and water (H2O).

III. Advantages of SCR system

High-efficiency purification:NOx conversion efficiency is as high as 90%, effectively reducing exhaust pollution.

Economic and environmentally friendly:Compared with other technologies, SCR system has better fuel economy and uses non-toxic and harmless urea solution.

Stable and reliable:The system has a simple structure, long service life and low maintenance cost.

Fourth, the future development of SCR system

With the continuous upgrading of emission regulations, SCR system will also develop in a more efficient and intelligent direction:

New catalyst:Research and develop catalysts with higher low-temperature activity and stronger sulfur resistance to improve system adaptability and durability.

Intelligent control:Use big data and artificial intelligence technology to achieve precise control of urea injection amount and further improve purification efficiency.

Integrated design:Integrate SCR system with other exhaust after-treatment technologies to form a more efficient exhaust purification solution.

In short, as a key technology for diesel vehicle exhaust purification, SCR system plays an important role in reducing environmental pollution and improving air quality. With the continuous advancement of technology, SCR system will make greater contributions to building green transportation and achieving sustainable development.

Website:www.enginenoxsensor.com