An EGR (Exhaust Gas Recirculation) system consists of a catalytic converter combined with an anti-particulate filter where part of the exhaust gases, after being filtered, flows back to the combustion chamber.
Properties
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NOx abatement in diesel engines;
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Efficiency of about 30%;
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Good mixture with intake air;
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Better turbine efficiency;
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Clean EGR (the recirculated gases are particulate-free).
Advantages
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Simple and compact system (low weight and cost);
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No additives needed (like for the SCR Selective Catalytic Reduction);
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System not subject to ageing due to the presence of sulphur in the fuel (like for the NT or DPNR systems).
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