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Exhaust Gas Recirculation (EGR) is being used widely to reduce and control the oxides of nitrogen (NOx) emission from diesel engines. EGR controls the NOx because it lowers oxygen concentration and flame temperature of the working fluid in the combustion chamber.
The composition of diesel fuel is kerosene, oil, and ether. Diesel  fuel also contains additives to help make it burn more efficiently  and to keep the temperature cooler in â¦ the engine.