Diesel Particle Filter Regeneration

In order to avoid damage to the filter the soot loading must be monitored and the filter has to be regenerated as and when necessary, that means the accumulated soot is combusted. Different technologies are used for this process in the commercial vehicle sector.

Continuous Regenerating Trap (CRT):
In the temperature range from 250 to about 450°C, the soot is combusted by means of nitrogen dioxide (NO2) that is generated from nitric oxide (NO) and oxygen (O2) in an oxidation catalyst upstream. The combustion is very slow, but continuously. Pre-condition to this simple passive regeneration process is that the vehicle is always operated within the above mentioned temperature range.

 

Active Regeneration:
In many applications exhaust temperatures fall below 250°C. Passive CRT is not possible there and active regeneration processes are used. Diesel fuel is injected directly into the exhaust system and either converted within an oxidation catalyst or ignited directly and combusted.

 

Tenneco offers HC injectors and vaporizers for this purpose that are also used for passenger cars.

 

Based on more than 20 years of experience in the development of burners Tenneco now also offers a highly efficient diesel burner for reliable diesel particle filter regeneration.