Introduction
The EGR (exhaust gas recirculation) leads a part of the exhaust gases back to the engine in order to reduce the emission of NOx (nitrogen oxide).
 
Advantages
  • The amount of nitrogen is reduced by 30%, because a small part of the exhaust gases is added to the air of the engine’s intake system.
  • The EGR-system doesn’t need additives or maintenance.
 
Disadvantages
  • The EGR-valve reduces the engine’s performance and increases the consumption a little bit. Internal pollution increases quickly, especially in the intake nozzle and in the engine’s intake valves. This problem can be solved by always charging your generating set with a load of 70% – 80%.
  • More diesel particulate matter is produced. This problem can be solved by using a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF).
 
Functioning
A small amount of exhaust gases is lead back and mixed with fresh air because a connection between intake and exhaust. Therefore, the mixture has a lower air/fuel ratio and there is a less good combustion. The combustion speed and temperature decrease, which causes the nitrogen content to drop as well.
 
CEGR
CEGR stands for cooled exhaust gas recirculation. This makes sure that the air lead to the intake is colder, so that the environmental requirements can be met. By using CEGR, less NOx is produced, but there are more soot particles. The EGR-cooler between the EGR-valve and the intake works as a heat exchanger and cools the exhaust gases.

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