Exhaust gas recirculation
-
Upload
sandeep-mohanta -
Category
Engineering
-
view
66 -
download
3
Transcript of Exhaust gas recirculation
![Page 1: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/1.jpg)
EXHAUSTGAS
RECIRCULATION
Submitted By:-SANDEEP KUMAR MOHANTA1301302009
![Page 2: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/2.jpg)
INTRODUCTION Major problem environmental pollution is faced by
today’s world. For which, vehicular traffic is a major contributor. Exhaust gases from vehicles includes
CO,CO2,HC,Noxs etc. 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 are also contribute to the formation of acid rain. NOx also cause breathing illness in human beings.
![Page 3: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/3.jpg)
FORMETION OF NOx The factors that cause diesel engines to run more
efficiently than gasoline engines also cause them to run at 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 long periods of time, the NITROGEN and OXYGEN in the air combines to form NITROGEN OXIDES.
These are normally collectively referred to as “NOx”.
![Page 4: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/4.jpg)
HOW CAN NOx BE REDUCED? In order to reduce NOx an engine should run
at a lower temperature than the normal temperature.
Reduced cylinder temperatures can be achieved in three ways.
1. Enriching the air fuel mixture2. Lowering the compression ratio and
retarding ignition timings3. Reducing the amount of Oxygen in the
cylinder
![Page 5: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/5.jpg)
EXHAUST GAS RECIRCULATION Exhaust Gas Recirculation is an efficient method
to reduce 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 reduces the amount of available O2 to the combustion And lowers the peak temperature of combustion.
Recirculation is usually achieved by piping a route from the exhaust manifold to the intake manifold.
A control valve within the circuit regulates and times the gas flow.
![Page 6: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/6.jpg)
BASIC PARTS OF EGR There are 3 basic parts of
EGR
1. EGR Valve
2. EGR Cooler
3. EGR Transfer Pipe
![Page 7: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/7.jpg)
EGR VALVE
![Page 8: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/8.jpg)
EGR COOLER
![Page 9: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/9.jpg)
EGR TRANSFER PIPE
![Page 10: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/10.jpg)
EGR ENGINE
![Page 11: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/11.jpg)
![Page 12: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/12.jpg)
WORKING PRICIPLE O2+N2 Gas In CO2,Nox,Etc
out 5%-30% of
NOx in to EGR EGR Valve
open Mixed with O2
and enters to Engine
![Page 13: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/13.jpg)
EGR OPERATING CONDITIONS
There are three operating conditions for EGR flow.
1. No EGR flow
2. Low EGR flow
3. High EGR flow
![Page 14: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/14.jpg)
VARIATION OF BSFC WITH ENGINE LOAD
![Page 15: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/15.jpg)
EXHAUST GAS TEMP Vs ENGINE LOAD
![Page 16: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/16.jpg)
BRAKE THERMAL EFFICIENCYVs
ENGINE LOAD
![Page 17: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/17.jpg)
ADVANTAGES It reduce Nox and save the
environment. It decreases the engine
temperature. Improve Engine life through
reduced cylinder temperature.
![Page 18: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/18.jpg)
DISADVANTAGES As EGR reduce O2 so it is difficult to
combust the fuel. Continues reduction of O2 reduce the
peak power required for the engine. EGR valves can’t responds all the time
and it will take time to flow the EGR gases.
As the amount of recirculated gas is less so for multicylinder engine the EGR gas is not reach in proper ratio.
![Page 19: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/19.jpg)
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 proven to be very useful and it is being modified further to attain better standards.
This method is very reliable in terms of fuel consumption.
EGR is the most effective method for reducing the Nitrous Oxide emissions from the engine exhaust.
![Page 20: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/20.jpg)
THANK YOU
![Page 21: Exhaust gas recirculation](https://reader036.fdocuments.in/reader036/viewer/2022081507/5872d2ba1a28ab74188b552f/html5/thumbnails/21.jpg)
ANYQUERIES…????