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Why should the exhaust be post-treated?

Source: http://www.chinatruck.org/

Everyone knows that after the combustion of diesel, particles and waste gas are emitted. In addition to the water and carbon dioxide produced by diesel combustion, there is also nitrogen oxides (represented by Nox). This nitrogen oxide is a harmful gas and must be treated before it can be discharged to the atmosphere. So the exhaust should be post-treated, truck exhaust should be post-treated, especially the heavy-duty truck. 

Why is there a lot of nitrogen oxides? Because diesel engines are all supercharged diesel engines. To completely burn out the diesel fuel, there must be enough oxygen to enter, and the problem is again: after too much oxygen, there is too much oxygen to produce rich products. Nitrogen oxides.


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