Exhaust Emission of a Diesel Engine Operating Under Steady State Condition with Biodiesel and EGR

Energy generations through combustion of hydrocarbon still remain the most important process for transport, industrial and home use. Biodiesel has become one of the fuels of preference due to increase of global crude oil price and environment concern. The combustion of biodiesel in unmodified diesel engine produces less emission of carbon monoxide, carbon dioxide and particulate matter. However, many technical report reveal that it produce high oxide of nitrogen due to higher of in-cylinder pressure when the engine operating with biodiesel. Some technology is already proven to be used effectively in conventional diesel engine such as exhaust gas recirculation system to reduce nitrogen oxide gas. This research article is intended to discuss the effect of biodiesel fuel and exhaust gas recirculation system on exhaust gas emission of a multi-cylinder diesel engine. The engine was operated at low load (constant) and low engine speed from 1000rpm to 2500rpm. The biodiesel fuel was derived from palm oil which easily available in most of the Asia countries. It is found that the emission of CO and CO₂ is 16%-20% higher when the exhaust gas recirculation system is in used especially for the engine operating with biodiesel. In general the engine produces higher carbon monoxide gas at higher engine speed but produces less CO² at higher engine speed from 1000rpm to 2500rpm. However, the emission of NOx is significantly reduced up to half of the exhaust emission with exhaust gas recirculation system. The reduction is even bigger at higher engine speed

Key-Words: – diesel engine, biodiesel, palm oil methyl ester

M.M.Noor