Exhaust gas recirculation ( egr) system
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Exhaust gas recirculation ( egr) system
- 1. EXHAUST GAS RECIRCULATION PRESENTED BY ASHEESH KUMAR Roll no:- 16028M02012 123seminarsonly.com
- 2. INTRODUCTION • Major problem faced by today’s world is environmental polluti on. • Of these vehicular traffic is a major contributor . • Exhaust gases from vehicles includes CO,CO2,HC,NOx ….. • Of these NOx is particularly very harmful. • These are one of the chief constituents of smog, which have an adverse effect on ecological systems. • They also contribute to the formation of acid rain. • NOx also cause breathing illness in human beings. 123seminarsonly.com
- 3. FORMATION OF NOx. • The factors that cause diesel engines to run more eff iciently than gasoline engines also cause them to ru n at a higher temperature. • This leads to the creation of nitrogen oxides (NOx). • Fuel in any engine is burned with extra air and some of the oxygen is used to burn the fuel. • When the peak temperatures are high enough for lo ng periods of time, the nitrogen and oxygen in the air combines to form Nitrogen oxides. • These are normally collectively referred to as “NOx”. 123seminarsonly.com
- 4. HOW CAN NOx BE REDUCED? • In order to reduce NOx a engine should run at a lower tem perature than the normal temperature. • Reduced cylinder temperatures can be achieved in three w ays. 1. Enriching the air fuel mixture 2. Lowering the compression ratio and retarding igniti on timings 3. Reducing the amount of Oxygen in the cylinder 123seminarsonly.com
- 5. EXHAUST GAS RECIRCULATION • Exhaust Gas Recirculation is an efficient method to redu ce NOx emissions from the engine. • It works by recirculating a quantity of exhaust gas back to the engine cylinders. • Intermixing the recirculated gas with incoming air reduce s the amount of available O2 to the combustion And lowe rs the peak temperature of combustion. • Recirculation is usually achieved by piping a route from t he exhaust manifold to the intake manifold. • A control valve within the circuit regulates and times the gas flow. 123seminarsonly.com
- 6. DIAGRAM Schematic Diagram of An EGR 123seminarsonly.com
- 7. BASIC PARTS OF EGR • There are 3 basic parts of EGR 1. EGR Valve 2. EGR Cooler 3. EGR Transfer Pipe 123seminarsonly.com
- 8. TYPICAL FOUR STROKE DIESEL ENGIN E WITH BASIC PARTS OF EGR 123seminarsonly.com
- 11. CONCLUSION • Using Exhaust Gas Recirculation Technique in engines, the emissions are vary much controlled due to lesser amounts of NOx entering the atmosphere. • Exhaust Gas Recirculation is a very simple method. It has pr oven to be very useful and it is being modified further to attai n better standards. • This method is very reliable in terms of fuel consumption • EGR is the most effective method for reducing the nitrous oxi de emissions from the engine exhaust. 123seminarsonly.com