The purpose of diesel vehicle control

The purpose of diesel vehicle control is as follows:

The key target pollutants for diesel vehicle control are: co, hc and NO.

These two pollutants are the main components of diesel vehicle exhaust. Nitrogen oxides are precursors of ozone and acid rain, while PM refers to particles with a diameter less than or equal to 10 micron. Among the nitrogen oxides emitted by diesel engines, NO accounts for about 90%, and NO2 is only a small part of it.

Nitrogen oxides and HC will produce photochemical smog under the action of sunlight, nitrogen oxides will also increase the concentration of ozone around them, and ozone will destroy the growth of plants. In addition, nitrogen oxides also have adverse effects on various fibers, rubber, plastics and electronic materials.

In addition, diesel vehicle exhaust also contains some other pollutants, such as carbon dioxide (CO2), hydrocarbons (HC) and carbon monoxide (CO). The discharge of these pollutants also needs to be controlled. In order to reduce the pollutants emitted by diesel vehicles, the measures taken include introducing exhaust aftertreatment technology, improving automobile fuel quality and improving engine design.

Tail gas emission treatment

1, oxidation catalyst (OCC), which is mainly used to remove soluble organic components (SOF) and hydrocarbons from tail gas by oxidation.

2. Particulate filter (DPF) and its regeneration technology are used to filter and remove particulate matter such as soot.

2. NOx purification technologies mainly include selective catalytic reduction (SCR) and NOx storage reduction (NSR).

4. Four-way catalytic technology for simultaneous purification of PM, HC, CO and nitrogen oxides. These aftertreatment technologies are one of the important means to solve the problem of diesel engine exhaust pollution by catalytic treatment of one or several pollutants respectively.