DefinePK

Abstract

In Compression Ignition engines, formation of NO_X is highly temperature dependent phenomenon and takes place when the temperature in the combustion chamber is very high (exceeds 2000 K). The problem of NO_X emission is also high when diesel engines are operated with biodiesel due to availability of more Oxygen. Therefore in order to reduce NO_X emission in the exhaust, it is necessary to keep peak combustion temperature under control. One simple way of reducing the NO_X emission of compression ignition engine is by injection delay of fuel in to combustion chamber. This method is effective but increases the fuel consumption, which necessitates the use of more effective NO_X reduction technique like exhaust gas recirculation (EGR). Recirculating part of the exhaust gas along with fresh air admission helps in reducing NO_X. An experimental investigation was conducted to study the effect of Exhaust Gas Recirculation on diesel engine Performance and Emission characteristics fueled with Waste Cooking Oil Methyl Ester and its blends with diesel. The EGR setup required for this work was developed on a single cylinder, direct injection, water cooled compression ignition engine. Waste Cooking Oil Methyl Ester produced by Transesterificaton process was used to operate the engine. The different EGR rates ranging from 0% to 20% in steps of 5% for waste cooking oil methyl ester blends with diesel fuel were consider for the study of various Performance and Emission characteristics. For all blends reduced NO_X emission was observed with EGR. The better engine characteristics were obtained with EGR rate of 15% for all fuel blends.