Exhaust Gas Recirculation (EGR)

Exhaust Gas Recirculation flow illustration | Doosanequipment EMEA

Also known as CEGR (Cooled Exhaust Gas Recirculation), this system reduces NOx by recirculating exhaust back into the engine. This dilutes the amount of oxygen in the combustion chamber and lowers the peak combustion temperature.

As a result, NOx formation is reduced but PM is increased. Because of this, Doosan uses EGR in combination with after-treatment systems (DOC and DPF) which are highly effective in reducing PM, as shown below.


EGR characteristics

  • No change to basic engine technology
  • No special service and maintenance procedures
  • No special operation instructions
  • No need for additives