What is EGR?
EGR or Exhaust Gas Reduction (EGR) is one of the widely adopted routes that are applied to reduce NOx emissions. It re-circles the engine’s exhaust back to intake a controllable proportion of the air and thereby maintains the permissible pollution level. Generally, a valve is also being used to control the gas flow.
The oxygen-rich air is substituted by burnt gas for reducing the contents available in the cylinder for combustion. In this way, lower heat is released by the cylinder, and the NOx formation is effectively reduced. With the help of inert gas present in the cylinder, the peak temperature of the ignition engine can be controlled.
The recirculated gas passes through the EGR cooler, usually consists of air/water. With the help of this gas, the temperature of the cylinder can be reduced, that results in the lower peak of the temperature of the EGR. The two essential benefits of this are,
