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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.
LPG or liquefied petroleum gas, is the generic name for propane (C3H8) and butane (C4H10) gas. Both of them are a mixture of hydrocarbon gases that people use as a fuel in heating appliances and vehicles. They can be transported/stored separately or as a mixture.These gases are called as liquefied petroleum gas because they liquefy under moderate pressure and readily vaporize upon release of pressure.oth of them are a mixture of hydrocarbon gases that people use as a fuel in heating appliances and vehicles. They can be transported/stored separately or as a mixture. These gases are called as liquefied petroleum gas because they liquefy under moderate pressure and readily vaporize upon release of pressure.