Current Affiliation

Shrawan Singh
Graduate Student, Solid Waste Research Group
Department of Environmental Engineering Sciences
University of Florida
Gainesville, Florida
shrawan@ufl.edu                                                                                               Back To >> Students's page

Master's Dissertation

Effect of EGR on Emissions, Lubricating Oil and Wear in Diesel Engine.


Abstract :

To meet stringent vehicular exhaust pretreatment and post-treatment techniques have been employed in modern Spark Ignition and Compression Ignition engines. Exhaust Gas Recirculation (EGR) is a technique, which is being used widely to reduce and control the NOx emission from diesel engines.However the use of EGR leads to rise in soot emission. This EGR generated soot leads to several other problems inside the engine like degradation of lubricating oil, enhanced engine wear e.t.c. In the present research work, an experimental investigation has been carried out to investigate the effect of EGR on emission pattern, lubricating oil and on wear of various vital engine parts.

A two cylinder, air cooled, constant speed Direct Injection engine of 9kW rating was used for the experiments. An experiment employing EGR was set up on the engine and were run for 96 hrs with a predetermined engine loading cycle using EGR and also without EGR (Under normal operating conditions). Temperature and smoke opacity of exhaust gas was measured to estimate the emission pattern.it was observed that with the use of EGR, percentage reduction in exhaust gas temperature was more then percentage increase in soot.

The lubricating oil of the engine was analyzed for metal addition after every 24hrs interval. Higher metal contents were found in the lubricating oil drawn from the engine using EGR. The generation of soot was qualitatively analyzed by taking pictures of incylinder engine parts. Higher carbon deposits were observed on the engine parts operating with EGR.

Higher wear was observed on piston rings of engine operated with EGR. The wear of cylinder liner was more at Bottom Dead Centre as compared to the Top Dead Centre in EGR operated engine whereas in the normally operated engine(Engines without EGR) higher wear was observed at TDC. The possible reason of high metal content in lubricating oil and higher wear in the EGR system may be the high soot content in the lubricating oil from the engine employing EGR.