13-09-2012, 11:17 AM
AN INVESTIGATION OF DIESEL ENGINE PERFORMANCE BY BLENDING DIESEL WITH DI-ETHYL ETHER WITH AND WITHOUT E.G.R.
AN INVESTIGATION OF DIESEL.ppt (Size: 2.66 MB / Downloads: 72)
Exhaust gas recirculation (EGR)
Exhaust gas recirculation (EGR) is a nitrogen oxide (NOX) emission reduction technique used in diesel engine.
EGR works by re-circulating a portion of an engine's exhaust gas back in to the engine cylinders.
In a diesel engine, the exhaust gas replaces some of the excess oxygen in the pre-combustion mixture.
Hence, EGT is reduced by EGR which actually reduces the amount of NOx emission.
DI-ETHYL ETHER
Diethyl ether, also known as ethyl ether, or ethoxy-ethane, is an organic compound with the formula (C2H5)2O.
It is a colorless, highly volatile flammable liquid with a characteristic odor.
Diethyl ether has a high cetane number of 85-96 and hence it is used as a starting fluid for diesel and gasoline engines because of its high volatility and low auto ignition temperature.
Diethyl ether has an auto Ignition temperature of 160 °C and Flash point temperature of -45 °C and its calorific value of 33,890.
Application of Di-Ethyl Ether is very vast in automobile industries as a fuel, in medical industries as an anesthesia and has many more laboratory applications.
STATEMENT OF PROBLEM
The main problem associated with diesel engine is its higher exhaust gas temperature (EGT) and higher emissions.
Even though many after emission treatment techniques like catalytic convertors are being used to reduce the emission of gas, it is found efficient at a reduced EGT.
Whereas in Diesel engine, the Exhaust Gas Temperature is high and hence treatment like Catalytic Convertors is not efficient.
Conclusion
The efficiency of engine has enhanced by blending DEE with diesel for different valve openings of EGR. But the efficiency has reduced with EGR without blending of DEE.
The exhaust gas temperature has reduced by having DEE as blends when the exhaust gas is re-circulated.
Specific Fuel Consumption of the engine can be decreased by the using DEE for various valve opening of EGR.
The maximum brake thermal efficiency is found to be 14.31 % for diesel with DEE at an EGR opening of ½ valve.
The EGT obtained for 16 KG of load at ½ opening of EGR with 10% blend is found to be 200oC where as for the same load without EGR it was 250oC.