Exhaust gas
recirculation is a technique of using the exhaust gases again into the engine
cylinder of an i.c. engine i.e. it recirculate the exhaust products to make it
useful again in the process of power generation by i.c. engine.
EGR System
In the i.c.
engine, the inter-coolers is installed. The exhaust gases will pass through the
inter-coolers the gases will be absorbed here and then the useful gases will be
extracted after passing through the inter-coolers and then the gases will be transferred
to the inlet port of the engine to reuse it. In the engine the gases can be
burn again to develop the power.
Recirculation
increases the mileage and efficiency of the engine. It decreases the peak temperature
in the engine cylinder. Exhaust gas recirculation makes the harmful exhaust
gases not to enter into the environment so it makes the engine to affect lesser
to the environment, rather it uses its temperature to increase the efficiency.
Exhaust gas
recirculation mainly focuses on the oxides of nitrogen and carbon. Oxides of
nitrogen is quit appropriate to use back in the inlet port from exhaust port.
The flow
rate of the exhaust gas is controlled by a regulator or valve (EGR valve).
The EGR can
be implemented by many methods e.g. By using camshaft, using VGT etc.
EGR VALVE
In the engine the EGR valve is installed in which all the necessary thing will be connected including inter-cooler and vacuum valves. The EGR is installed near to the engine cylinder. EGR valve is a medium of transferring exhaust gases to inlet port. That is why it is most important part in the whole system of EGR. If this valve do not work properly the whole system will be failed.Advantages of EGR System
1. It can decrease the emission of harmful gases even if the fuel has toxic substance.
2. Overall emission in EGR engine is less and efficiency is high as compare to engines not using EGR.
3. The concentration of oxygen in the combustion chamber can be controlled.
4. Emission of oxides of nitrogen can be controlled.
5. EGR system is more environment friendly then non-NGR engines.
CONCLUSION:-
EGR is an
effective method to control the concentration of oxygen in the combustion
chamber and to reduce the emission of nitrogen oxides. It makes the system sufficient
thermally.
Different automobile
companies using different methods for exhaust gas recirculation in their
vehicle. There is always an effort by these companies to make this system
better to increase the efficiency even more.
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