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What is the function and efficacy of automobile urea?

Function and efficacy of automobile urea: 1. The main pollutants emitted by diesel engines are nitrogen oxides (NOx) and PM (particulate matter), and the working conditions required to reduce these two emissions are just the opposite. Therefore, two technical schemes, EGR (exhaust gas recirculation) and SCR (selective catalytic reduction), have emerged to meet the requirements of national emission.

2. During the combustion process of the engine using SCR technology, diesel oil has been fully burned by technical means to achieve the purpose of effectively controlling PM emission, while nitrogen oxides need to be reduced to nitrogen (N2) and water (H2O) in the exhaust process, and the reducing agent in this process is urea solution for vehicles;

3. After the tail gas comes out of the turbocharger, it enters the exhaust pipe. A urea metering injection device is installed on the exhaust pipe. When the temperature reaches 300℃-500℃, urea solution is injected. Under the action of catalyst, urea (NH2CONH2) is hydrolyzed to generate NH3 and CO2, and NH3 reacts with nitrogen oxides to generate nitrogen and water.

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